Factory Supply Xylene Liquid CAS 1330-20-7 Raw Materials

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Uses and synthesis of Xylene Liquid

Xylene Raw Materials is a colorless and transparent liquid with aromatic smell, it is the product of two hydrogens on the benzene ring being replaced by methyl, the boiling point is 137~140°C. Xylene is divided into three isomers according to the position of the two methyl groups: o-xylene, m-xylene, p-xylene, and industrially, Xylene Raw Materials refers to the mixture of the above isomers and ethylbenzene. In industry, Xylene Raw Materials refers to the mixture of the above isomers and ethylbenzene. Generally, the grades are superior and first grade in the distillation range of 3℃ and 5℃ in purified water. It can be mixed freely with ethanol, chloroform or ether, and is insoluble in water.

Xylene Liquid is widely used as organic solvent and synthetic pharmaceuticals, paints, resins, dyes, explosives and pesticides. Xylene is moderately toxic and also carcinogenic.The pollution of Xylene Liquid mainly comes from synthetic fibers, plastics, fuels, rubbers, additives of various paints and all kinds of adhesives, waterproof materials, and also from the combustion gas of fuel and tobacco.、

Xylene CAS 1330-20-7 is an important important organic chemical material, there are adjacent, m- and p-isomers, o-xylene is mainly used for the production of phthalic anhydride, which is an important raw material for the manufacture of a variety of dyes and indicators (e.g., phenolphthalein). The 4,6-dimethyl-1,3-phenylenediamine produced by nitration and reduction of m-xylene is an intermediate for synthetic dyes, and m-xylene can also be used as a raw material for synthetic fragrances (e.g., xylene musk). P-xylene is mainly used in the manufacture of terephthalic acid, which is an important raw material for the synthesis of polyester fibers (polyester).Xylene CAS 1330-20-7 is present in coal tar and certain petroleum.Xylene CAS 1330-20-7 is extracted industrially mainly from the C8 fraction of naphtha reforming products.

Xylene CAS 1330-20-7 contains 50% to 60% m-xylene and 20% to 25% each of o- and p-xylene by volume. Xylene can be used directly as a solvent without separation, and can be added to gasoline to improve anti-explosive properties; they are a component of aviation gasoline. The boiling point of o-xylene is relatively high and can be fractionated using distillation, while p-xylene has a higher melting point and is purified using stepwise crystallization.Xylene CAS 1330-20-7 is also present in coked crude benzene and petroleum cracking oil.

Crude benzene is separated from benzene and toluene by preliminary distillation, sulfuric acid washing, and fine distillation, after which xylene, also known as coked xylene, can be obtained by further distillation. The quality of coked xylene depends on the separation capacity of the distillation column, the temperature at the top of the column and the reflux ratio. China classifies coker xylene products into three grades.

Applications / Functions of Xylene Liquid

1. Xylene Liquid is widely used as organic solvent and raw material for synthesizing pharmaceuticals, paints, resins, dyes, explosives and pesticides.
2. Xylene Liquid is used as cleaning agent
3. Xylene CAS 1330-20-7 solvent, determination of water in many organic compounds, microscope cleaner. Cleaner for silicon components and thermistors, etc. Mixed xylene is a mixture of o-; m-; p-xylene and ethylbenzene. When used as a chemical raw material, the isomers can be separated in advance. The mixture is mainly used as a solvent for paint and coatings and as an additive for aviation gasoline.
4. Xylene CAS 1330-20-7 is mainly used as chemical raw materials and solvents for the production of phthalic anhydride, dyes, pesticides and drugs such as vitamins, etc. It is also used as an additive in aviation gasoline.
5. Xylene Raw Materials are widely used as solvents in paint, resin, dyestuff, ink and other industries; as synthetic monomers or solvents in pharmaceutical, explosives, pesticide and other industries; also as high octane gasoline components, which are important raw materials for organic chemicals. xylene Raw Materials can also be used to remove asphalt from bodywork. It is mainly used in hospital pathology department for preparation. Mainly used for dehydration. Dewaxing

Xylene Liquid properties and stability

A mixture of p-xylene, o-xylene, m-xylene and ethylbenzene. Colorless and transparent liquid. Soluble in ethanol and ether, insoluble in water.

●Physical shape and color: colorless and transparent liquid;

●Odor: Strong aromatic odor;

●Melting point(℃): -45;

●Boiling point (℃): 137-144.42;

● Relative density (water=1): 0.860-0.870;

●Flash point(℃): 23;

●Spontaneous combustion temperature(℃): 499~530;

Solubility: insoluble in water, miscible in ethanol, ether, chloroform, aromatic hydrocarbons, aliphatic hydrocarbons and other organic solvents.

Production method of Xylene Liquid

1. Coking by-product recovery of benzene high temperature coking by-product of high-temperature tar, containing part of benzene. First by the primary distillation tower primary distillation, the top of the tower to get light benzene, the bottom of the tower to get heavy benzene (heavy benzene used as a raw material for the production of Gumarone resin). The light benzene is first separated by the primary distillation tower, and the mixed fraction at the bottom of the tower is washed by acid and alkali to remove impurities, then it is steamed and blown into the benzene blowing tower, and then distilled by the distillation tower to get pure benzene.
2. Platinum reforming method with atmospheric distillation of light gasoline (initial distillation point of about 138 ℃), interception of greater than 65 ℃ fraction, first by the molybdenum-containing catalyst, catalytic hydrogenation to remove harmful impurities, and then by the platinum catalyst for reforming, solvent extraction with diethylene glycol ether, and then distillation tower by tower to get benzene, toluene, xylene and other products.

• 1、Recovery of xylene from coking by-products. Xylene is a co-product of benzene production. According to the different boiling points of each component of crude benzene, the fraction with boiling range 135~145℃ is extracted by distillation to get xylene.
• 2, platinum reforming method with atmospheric distillation of light gasoline (initial distillation point of about 138 ° C), intercepted greater than 65 ° C fractions, first by a molybdenum-containing catalyst, catalytic hydrogenation to get rid of harmful impurities, and then platinum catalysts for the reforming, extraction with diethylene glycol ether solvent, and then distillation tower by tower, to get the products of benzene, toluene, xylene and so on.
• 3、Toluene disproportionation method. This method is under the action of the catalyst, so that the methyl group of one toluene is transferred to another toluene to produce benzene and xylene. The reaction is with DF-166 catalyst (lack of aluminum hydrogen type mercerized zeolite), to reformed toluene (nitrate grade) and reforming cycle hydrogen (85% ~ 90%) as raw materials, reaction temperature 400 ± 2 ℃, pressure of 2MPa or so under the conditions of the reaction, the reaction of benzene and xylene.
• 4. Mixed benzene from petroleum light distillate is hydro-refined, catalytic reformed and separated to obtain xylene. Or coking crude benzene is obtained by washing and fractionation.

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