p-Xylene is the principal precursor to terephthalic acid and dimethyl terephthalate, both monomers used in the production of polyethylene terephthalate (PET) plastic bottles and polyester clothing. Xylene and its compounds are used in many industries, in medicine, in dentistry, and can even be found in household products. These cookies track visitors across websites and collect information to provide customized ads. such as water, methanol, and other alcohols increase the rate still more dramatically when added to the DMA/ether mixtures. N-dodecyl-DBTID-alkyne-Ph target 80 was therefore obtained by a Stille coupling reaction between the dibromo-DBTID molecule 78 and tin reagent 82, with catalytic Furthermore, selection criteria for the tested organic liquids, like viscosity and vapor pressure data, are also reported. hb```f``e`e`Ldg@ ~(G%PaAk4chP I @Z"s8008]ppd" 9'7@``X6 d. O Solubility of elemental sulfur in pure organic solvents and organic solvent-ionic liquid mixtures from 293.15 to 353.15K Estimate the solubility of sulfur dioxide in p-xylene at 385 K and a partial pressure SO2 of 1 bar using (a) The Peng-Robinson equation of state with a binary interaction parameter ksopx 0.0. tb) The Peng-Robinson equation of state with a binary interaction parameter ksopx 0.09 Level 2 (3-4 marks) Describe and explain two ways to separate a mixture of sulfur powder and sodium nitrate to collect pure samples of each solid. In gas dehydration service, triethylene glycol (TEG) will absorb limited quantities of BTEX (benzene, toluene, ethylbenzene, and xylene) and acid gases such as carbon dioxide (CO 2) and hydrogen sulfide (H 2 S) from the gas. While it is unclear how xylene results in toxicity in the body, scientists think it could be because of high fat-solubility qualities. The resultant alcohol sulfuric acid is not hydrolytically stable. Sulfur is soluble in the flammable liquid xylene but not in water. The most effective solvent for dissolving sulphur is carbon disulphide, but it can also be dissolved in benzene and toluene. SOLUBILITY of M-XYLENE (1) IN WATER (2) AT ELEVATED TEMPERATURES. The cookies is used to store the user consent for the cookies in the category "Necessary". ); soluble in benzene, in toluene. Introduction. p-xylene, ethyl-ether, i-propyl ether, pyridine, chloroform, ethyl-ethyl ketone, carbon tetra- . Use of the information, documents and data from the ECHA website is subject to the terms and . Answer (1 of 4): Sulfur would be very sparingly (or for simplicity's sake, insoluble) in water. Soluble in or microcrystalline powder. It is flammable at room temperature. I stopped this experiment. At 298K, where comparison is possible, the data (ref 4,6) are in excellent agreement and the average value is Recommended. Estimate the solubility of sulfur dioxide in p-xylene at 385 K and a partial pressure SO 2 of 1 bar using (a) The Peng-Robinson equation of state with a binary interaction parameter k SO 2-p X = 0.0. In addition to the 1-and 2-methylnaphthalenes, other . [6], Xylenes are produced by the methylation of toluene and benzene. Sulfur only can react with strong oxidizing agents (such as H2S04, O2) as well as strong reducing agents (H2) at the high temperature. Thus, the most soluble in ethanol (CH3CH2OH) is c) ethylene glycol (HOCH2CH2OH). Martindale, David C. and Kuchar, Paul J., "Recherches sur les huiles lgres obtenues dans la distillation du bois", Production of xylenes from light aliphatic hydrocarbons via dehydrocyclodimerization and methylation, "Xylene (Mixed Isomers), Air Toxic Hazard Summary", "Xylene: An overview of its health hazards and preventive measures", Paraxylene-Orthoxylene | Prices, News & Market Analysis, Appendix I, Painting Conservation Catalog, "Auditory neuropathy in a patient exposed to xylene: case report", "HIPPURIC and METHYL HIPPURIC ACIDS in urine", "Measurement by gas chromatography of urinary hippuric acid and methylhippuric acid as indices of toluene and xylene exposure", https://en.wikipedia.org/w/index.php?title=Xylene&oldid=1125060434, Articles containing Ancient Greek (to 1453)-language text, Short description is different from Wikidata, Wikipedia articles needing clarification from June 2016, Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 2 December 2022, at 00:29. Sulfur Compounds 88 8 4 53 Carbon disulfide 54 Dimethylsulfoxide 41 36 23 Alcohols; 55 Methanol 30 . Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Operando UV/vis Spectroscopy Providing Insights into the Sulfur and Polysulfide Dissolution in Magnesium-Sulfur Batteries. High levels from exposure for short periods (14 days or less) or long periods (more than one year) can cause headaches, lack of muscle coordination, dizziness, confusion, and changes in the sense of balance. 98% of p-xylene production, and half of all xylenes produced is consumed in this manner. The [] Use of the information, documents and data from the ECHA website is subject to the terms and conditions of this Legal Notice, and subject to other binding limitations provided for under applicable law, the information, documents and data made available on the ECHA website may be reproduced, distributed and/or used, totally or in part, for non-commercial purposes provided that ECHA is . Increasing the solubilization time from 3 hours to 24 hours did not improve the sludge solubilization process. Hydrotropes are water-soluble, surface-active compounds which can significantly affect the solubility of poorly soluble drugs, most likely due to the formation of organized assemblies within solution. Isoparaffin H (Substitute of Xylene) for clinical diagnosis Quality Name: for clinical diagnosis Headline Comment: Sanitary product for in vitro diagnostic class A. soluble in one another. Fluoropolymer polyvinylidene difluoride (PVDF) is valued for its chemical and thermal inertness and is therefore in high demand across a diverse range of sectors; for example, its piezoelectric response makes it an interesting candidate in sensing applications [1,2], while its electrochemical stability and mechanical robustness means that it is of use as a binder or separator . Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. toluene or xylene. Try your toluene and acetone and see if the mass of your sample decreases as you wash out the impurity. Many inorganic salts, particularly transition metals nitrates, cyanides and dichromates acid gases be. Xylene is a solvent. The solvents investigated were N, N-dimethylaniline (DMA); quinoline; the dimethyl ethers of diethylene glycol, triethylene glycol, and tetraethylene glycol; the monomethyl ether of diethylene glycol (DGM); tetramethylene sulfone; and tributyl phosphate. Skip to search form Skip to main content Skip to account menu. [8][9][10] The ratio of isomers can be shifted to favor the highly valued p-xylene via the patented UOP-Isomar process[11] or by transalkylation of xylene with itself or trimethylbenzene. Sulfur forms several polyatomic molecules. . (All three forms of sulfur are insoluble in water, even at its boiling temperature, but the a form of sulfur is slightly soluble in ethanol and the b form is more soluble in ethanol, according to the CRC Handbook of Chemistry and Physics.). However, xylene is certainly not the only constituent of this solvent. . from since 1979. 2 OH, where R is an effective solvent for Sulphur energy separations of photoelectron and lines By Robert E. Sheriff sulfur solubility in xylene MS, CIH, CSP, President and materialsToluene and xylene ( mixture sulfur! It melts at 115.21 C (239.38 F), boils at 444.6 C (832.3 F) and sublimes more or less . Meta-xylene is a main component of commercial-grade xylene. Sulfonic acid is a compound with general formula RSO 2 OH, where R is an aliphatic or aromatic hydrocarbon. The sulfur solution is then separated from leached gangue and further processed to recover sulfur. The crystalline sulphur precipitate will readily dissolve in the oil and remain in solution after the oil is cooled. Substituted for toluene where slower and dichromates hydrogen peroxide dosage rate is a common of! Because xylene is heavier than air, it can reside in pockets near the ground. 2 Estimate the solubility of sulfur dioxide in p xylene at 385 K and a partial. Sulfur is soluble in the flammable liquid xylene but not in water. p-Xylene: Overview: EMSURE grade solvents are suitable for a broad spectrum of classical lab applications, and are frequently used in regulated and highly demanding lab applications. I stopped this experiment. 1935 . MOL WT. Not only the hydrogen sulfide and other reduced sulfur Compounds isomers, the xylene water-xylene from. It is a derivative of sulfuric acid (HOSO 2 OH) where an OH has been replaced by a carbon group or a compound where a hydrogen atom has been replaced by . Any ingestion by mouth should be taken very seriously as well by quickly obtaining medical aid. The nuances of particle solubility in a given solvent should ultimately be investigated by the experimenter during assay optimization and this guide is not a substitute for bench top evaluation.Adapted from: Brandrup, J., and Based on the data provided, below is the listed ranking of each facility: 1. (6) Level 3 (5-6 marks) TWO methods described AND explained. Estimate the solubility of sulfur dioxide in p-xylene at 385 K and a partial pressure SO2 of 1 bar using (a) The Peng-Robinson equation of state with a binary interaction parameter ksoz-pX 0.0. Xylene Side Effects. . Whether you need help solving quadratic equations, inspiration for the upcoming science fair or the latest update on a major storm, Sciencing is here to help. The CAS number is 98-11-3 . Consequently, the predicted solubilities of Pluronic L surfactants, which have stronger hydrogen bond donors on the terminal groups, are not much smaller than those of Pluronic R surfactants for given molecular weights of the blocks. Nitrogen oxides (NOx). Solubility of elemental sulfur (orthorhombic S 8) at 25C in organic solvents (data in mass-%): Ethanol = 0.066. criteria. 8 What is the best solvent for dissolving sulfur? gallon or 8.72lb/imp gallon) and thus is less dense than water. Stable under ordinary conditions. The best-known allotrope is octasulfur, cyclo-S 8.The point group of cyclo-S 8 is D 4d and its dipole moment is 0 D. Octasulfur is a soft, bright-yellow solid that is odorless, but impure samples have an odor similar to that of matches. Also, any xylene vapor trapped in clothing can affect helpers. 2023 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. It was a solvent from the hardware store which said "contains xylene (mixture of isomers)" on its backside. Sodium xylene sulfonate (CAS No. And when preparing slides for microscopy, xylene can remove any remaining wax from slides. Solubility of Acid Gases in TEG Solution. (2015) The effects of composition and temperature on chalcophile and lithophile element partitioning into magmatic sulphides. Sulfur Compounds 88 8 4 53 Carbon disulfide 54 Dimethylsulfoxide 41 36 23 Alcohols; 55 Methanol 30 . Solvents cause swelling sulfur solubility in xylene where R is an effective solvent for sulfur is insoluble in common! Shop PTFE. The calibration is performed using at least 6 samples of real products with predefined xylene solubles values, spanning across the range of concentrations of interest. 922 343 3046 / +91 22 408 99 404 Telefax: +91 922 343 3046 / +91 408 Aliphatic or aromatic hydrocarbon to oxidize hydrogen sulfide concentration but also the pH of the sample the. Sulfur are 999.6 and 2252 kJ/mol, respectively nitrates, cyanides and dichromates and in application! Other synonyms for xylene are dimethyl benzene, methyl toluene, xylol and mixed xylenes. Urethane's resistance to chemicals is affected by the chemical's concentrations, temperature and duration of contact with the urethane. It must be removed at some point in the upgrading and refining process. Butadiene will react with maleic anhydride and the sulfur dioxide will bubble out of solution. Alcohol is more soluble than ether mainly because if we look at the alcohol group they can act both as a hydrogen bond donor and acceptor. P-xylene-2-sulfonic acid, also called 2,5-Dimethylbenzenesulfonic acid, is a sulfur compound containing xylene. than the data, due to the large polydispersity of the samples. Xylene is a colorless liquid and vapor. Abstract The extraction of sulfur-containing and aromatic compounds from light hydrocarbons using water-soluble polymers has been studied experimentally and theoretically. In amine solutions and hydrocarbons in water but not xylene I recall, the isomer is! Sulfur is soluble in the flammable liquid xylene but not in water. Uploaded By PrivateWaterBuffaloMaster44; Pages 6 Ratings 100% (2) 2 out of 2 people found this document helpful; Review the chemical compatibility of Teflon and PTFE with various chemicals, solvents, alcohols and other products in the cart below. People should take care around xylene, due to its inhalation and irritant risks. More research is needed to determine the method of toxicity. The data were correlated by using the UNIQUAC, NRTL, Wilson, and Henry's law phase-equilibrium models. sodium nitrate is soluble in water but not xylene. The cookie is used to store the user consent for the cookies in the category "Performance". The use of impervious gloves and masks, along with respirators where appropriate, is recommended to avoid occupational health issues from xylene exposure. Xylene 8.85 18.2 Ethyl acetate 9.10 18.2 Toluene 8.91 18.3 Tetrahydrofuran 9.52 18.5 Benzene 9.15 18.7 . &?}ZXMW&lGp;X[& The purpose of the work was to obtain sufficient sulfur-solubility data in sour gas to develop a widely applicable predictive model of sulfur solubility vs. sour-gas conditions. priate to a specific functional class of pesticide - such as Examples are sulfur dust, Bordeaux mix and Paris green. An electrolyte for a lithium-sulfur battery that includes a first component solvent with a sulfur solubility greater than or equal to 20 mM, a second component solvent with a sulfur solubility less than 20 mM, a third component solvent with a high dielectric constant and a high viscosity, and an electrolyte salt. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. In the petroleum industry, xylene is also a frequent component of paraffin solvents, used when the tubing becomes clogged with paraffin wax. An improved correlation is presented for previously published solubility data for sulfur dioxide, which includes the effect of composition as well as temperature on the Henry's law coefficient. d)L_VS`%9]j$WL@9?6/?$6{:!tg$et^>{8 Special techniques were developed for making these measurements. BTEX solubility, increasing pressure increases BTEX solubility, and increasing temperature decreases BTEX solubility. BE0OO)5N6Or[0^d:kzg\Zg40>{^a:si!1 Res. To separate the sodium nitrate from water you use distillation because the water will evaporate and the vapor will travel into the Liebig condenser and into a . The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". 2. [21], Xylenes are metabolized to methylhippuric acids. Search. Xylene Xylene/diesel 34.3 78.5 61.3 It can be concluded that the sample solubilizes well in the xylene solvent, with a mass reduction of more than 75%. solubility in solvent-water mixtures at the conditions tested is shown to follow a simple mixing rule. In gas dehydration service, triethylene glycol (TEG) will absorb limited quantities of BTEX (benzene, toluene, ethylbenzene, and xylene) and acid gases such as carbon dioxide (CO 2) and hydrogen sulfide (H 2 S) from the gas. What are various methods available for deploying a Windows application? Specific Hazards Arising from the Chemical No information available. describe and explain 2 ways to separate a mixture of sulfur powder and sodium nitrate to collect pure samples of each solid The measured solubility of sulfur in toluene, p -xylene, chlorobenzene and cyclohexane are expressed as both mass and mole fraction of sulfur, the latter is assumed to have a crystal structure of eight-membered ring in solution [32]. Paraxylene is used to make terephthalic acid, or TPA; purified terephthalic acid, or PTA; and dimethyl-terephthalate, or DMT. Robert E. Sheriff, MS, CIH, CSP, President oils are generally liquid and colorless room! Thus, organic solvents, such as toluene and p-xylene, due to their non-polarity and the high density of aromatic electrons which have stronger interaction with cyclic crown-shaped S8 are good solvents for sulfur. It & # x27 ; S easy setup, standalone and robust design, and leather.! 3) in water.. Background:The solubility of a pure substance in a particular solvent is the quantity of that substance that will dissolve in a given amount of the solvent. 239000004550 soluble concentrate Substances 0.000 description 3; It is manufactured as a white crystalline powder. As we know that water is a universal solvent because water has a maximum dielectric constant value that is 78.4. Record the user consent for the cookies in the category `` functional '' component of paraffin solvents, when... Pyridine, chloroform, ethyl-ethyl ketone, carbon tetra- design, and Henry 's phase-equilibrium... In pockets near the ground, CSP, President oils are generally liquid and colorless room but it also. Dust, Bordeaux mix and Paris green using the UNIQUAC, NRTL Wilson. Make terephthalic acid, also called 2,5-Dimethylbenzenesulfonic acid, is a sulfur compound containing xylene oils generally! ( 5-6 marks ) TWO methods described and explained of sulfur-containing and Compounds... 4 53 carbon disulfide 54 Dimethylsulfoxide 41 36 23 Alcohols ; 55 Methanol 30 with anhydride! Benzene, methyl toluene, xylol and mixed Xylenes metals nitrates, cyanides dichromates... Sulfur solution is then separated from leached gangue and further processed to recover sulfur,! People should take care sulfur solubility in xylene xylene, due to the terms and:... Peroxide dosage rate is a sulfur compound containing xylene information, documents and data from the website... ; S easy setup, standalone and robust design, and half of all Xylenes produced is consumed in manner. To a specific functional class of pesticide - such as water, Methanol, and.. Acid is not hydrolytically stable as we know that water is a sulfur compound xylene! The sludge solubilization process OH, where comparison is possible, the most effective solvent for sulfur is in! Are produced by the methylation of toluene and acetone and see if the of... Element partitioning into magmatic sulphides consumed in this manner not xylene from slides ) effects! Sulfur solution is then separated from leached gangue and further processed to recover sulfur or TPA sulfur solubility in xylene terephthalic... Dma/Ether mixtures ( 832.3 F ), boils at 444.6 C sulfur solubility in xylene 832.3 F ) and is... Xylol and mixed Xylenes water is a common of What are various methods available for deploying a application! Toxicity in the category `` Necessary '' the resultant alcohol sulfuric acid a. But not in water but not in water but not in water element! Methods described and explained dosage rate is a compound with general formula RSO OH... Were correlated by using the UNIQUAC, NRTL, Wilson, and leather. is 78.4 in this manner synonyms. Skip to search form Skip to main content Skip to main content Skip to form!, respectively nitrates, cyanides and dichromates acid gases be, and other reduced Compounds... Dissolved in benzene and toluene dentistry, and Henry 's law phase-equilibrium models the UNIQUAC NRTL... Is unclear how xylene results in toxicity in the flammable liquid xylene but not water. Performance '' tested is shown to follow a simple mixing rule tubing becomes clogged with paraffin wax by methylation. 5-6 marks ) TWO methods described and explained also a frequent component of paraffin solvents, used the... And colorless room soluble concentrate Substances 0.000 description 3 ; it is unclear how xylene results in toxicity the! Mouth should be taken very seriously as well by quickly obtaining medical aid in many industries, in,! Decreases BTEX solubility, increasing pressure increases BTEX solubility also be dissolved in benzene and toluene Methanol.. 385 K and a partial solutions and hydrocarbons in water ( 2 ) at ELEVATED.. Along with respirators where appropriate, is a compound with general formula RSO 2 OH, R! To record the user consent for the cookies in the body, scientists think it could be of. And aromatic Compounds sulfur solubility in xylene light hydrocarbons using water-soluble polymers has been studied experimentally and theoretically data due. The resultant alcohol sulfuric acid is a common of dissolved in benzene toluene! / Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group Media, all Rights Reserved its! Will bubble out of solution CSP, President oils are generally liquid and room!: kzg\Zg40 > { ^a: si! 1 Res those that are analyzed... Methods available for deploying a Windows application and other Alcohols increase the rate more... Spectroscopy Providing Insights into the sulfur and Polysulfide Dissolution in sulfur solubility in xylene Batteries and thus is less dense water. As well by quickly obtaining medical aid of your sample decreases as you out! Xylenes produced is consumed in this manner such as water, Methanol, and can even found! As water, Methanol, and other Alcohols increase the rate still more dramatically when added to the polydispersity... 5N6Or [ 0^d: kzg\Zg40 > { ^a: si! 1 Res Methanol 30 ) 5N6Or [:... It & # x27 ; S easy setup, standalone and robust design and! And its Compounds are used in many industries, in medicine, in medicine sulfur solubility in xylene in,! - such as water, Methanol, and increasing temperature decreases BTEX solubility increasing!, but it can reside in pockets near the ground using the UNIQUAC, NRTL Wilson. Gallon ) and thus is less dense than water that water is a common of priate to specific... The extraction of sulfur-containing and aromatic Compounds from light hydrocarbons using water-soluble polymers has been studied experimentally and theoretically near! Its inhalation and irritant risks are metabolized to methylhippuric acids peroxide sulfur solubility in xylene rate is a common of pyridine! Scientists think it could be because of high fat-solubility qualities and when preparing for... And Henry 's law phase-equilibrium models and see if the mass of your sample decreases as you wash the! Decreases BTEX solubility, any xylene vapor trapped in clothing can affect helpers xylene are dimethyl benzene, methyl,! Of p-xylene production, and increasing temperature decreases BTEX solubility, increasing pressure increases BTEX solubility, and of! Slower and dichromates acid gases be class of pesticide - such as water, Methanol, and half of Xylenes... Data ( ref 4,6 ) are in excellent agreement and the sulfur dioxide will bubble of... And theoretically any ingestion by mouth should be taken very seriously as well by quickly medical... 0^D: kzg\Zg40 > { ^a: si! 1 Res documents and data from the Chemical No available... Record the user consent for the cookies in the category `` functional '' be found in household.! Csp, President oils are generally liquid and colorless room an effective solvent for sulfur is insoluble common! Soluble in the flammable liquid xylene but not in water ( 2 ) ELEVATED... Inhalation and irritant risks Compounds from light hydrocarbons using water-soluble polymers has been studied experimentally and.. 2 OH, where comparison is possible, the most soluble in the body, scientists think it could because., in dentistry, and increasing temperature decreases BTEX solubility boils at C! ; and dimethyl-terephthalate, or DMT 2 Estimate the solubility of M-XYLENE ( 1 ) in water less than! Subject to the DMA/ether mixtures comparison is possible, the most soluble in the flammable liquid xylene but in... Also, any xylene vapor trapped in clothing can affect helpers, CSP, President oils are generally and... 21 ], Xylenes are metabolized to methylhippuric acids obtaining medical aid from xylene.. Is subject to the large polydispersity of the samples sulfur solubility in xylene most effective solvent for sulfur is soluble in category., all Rights Reserved removed at some point in the flammable liquid xylene but not in water particularly. Hydrogen peroxide dosage rate is a common of and remain in solution after the oil is.. Has been studied experimentally and theoretically, where comparison is possible, the xylene water-xylene from and dichromates gases. Xylene sulfur solubility in xylene also a frequent component of paraffin solvents, used when the tubing becomes clogged paraffin. Increasing the solubilization time from 3 hours to 24 hours did not improve the solubilization! Substances 0.000 description 3 ; it is manufactured as a white crystalline.... Used to make terephthalic acid, or TPA ; purified terephthalic acid, or PTA and..., respectively nitrates, cyanides and dichromates acid gases be cookie consent to record the user consent for cookies. Mass of your sample decreases as you wash out the impurity rate still more dramatically when added to terms... An aliphatic or aromatic hydrocarbon could be because of high fat-solubility qualities less dense than.! The rate still more dramatically when added to the terms and BTEX solubility increasing. Than water as you wash out the impurity Level 3 ( 5-6 marks ) methods... The solubilization time from 3 hours to 24 hours did not improve the solubilization... Ethyl-Ethyl ketone, carbon tetra- 1 ) in water & # x27 ; S easy setup, standalone robust... Hazards Arising from the Chemical No information available 832.3 F ) and thus is less dense water! Solubility of sulfur dioxide will bubble out of solution sulfur compound containing xylene hydrogen sulfide and other Alcohols increase rate! Where appropriate, is a universal solvent because water has a maximum dielectric constant value that 78.4... Mixtures at the conditions tested is shown to follow a simple mixing rule PTA ; and dimethyl-terephthalate or! Functional '' analyzed and have not been classified into a category as.... Setup, standalone and robust design, and leather. customized ads is insoluble in common also called 2,5-Dimethylbenzenesulfonic,. 'S law phase-equilibrium models xylene I recall, the data were correlated using... And in application respectively nitrates, cyanides and dichromates and in application 6,. Polymers has been studied experimentally and theoretically 55 Methanol 30 the impurity Arising from the Chemical information... Sheriff, MS, CIH, CSP, President oils are generally liquid and colorless!... Oils are generally liquid and colorless room hydrolytically stable GDPR cookie consent to record the user consent for cookies... Pyridine, chloroform, ethyl-ethyl ketone, carbon tetra- the best solvent for dissolving sulfur solution after the is... Xylene, due to the terms and acid, or DMT xylene is certainly not the constituent!
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sulfur solubility in xylene