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1,4-Xylene (1,4-Xylene)

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1,4-Xylene

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4-methyltoluene
1,4-Dimethylbenzene
Paraxylene
1,4-dimethyl-benzene
Benzene, 1,4-dimethyl-
para-xylene
p-methyl-toluene
p-Xylol
p-dimethylbenzene

+Expand -Stow

106-42-3

C8H10

106.165

2902430000

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Nature Description

Colorless liquid. Melting point ℃, boiling point ℃, flash point ℃. Relative density (20/4℃)0.8611,(25/4℃)0.8610, refractive index (nD25)1.4958,(nD21)1.5004. It is colorless flake or prism crystal at low temperature. Can be mixed with ethanol; Ether; Acetone and benzene, insoluble in water. Explosion limit: 1%-6% (volume).

0.861

138℃

12-13℃

77?°F

1.495

Product Applications

I. Solvents for rubber and paint and additives for aviation power fuel II. Used as chromatographic analysis standard substance and solvent, and also used in organic synthesis III. Used as raw material for producing polyester fiber and resin, paint, dye and pesticide 4. It is used to produce terephthalic acid and then produce polyester resin such as ethylene terephthalate and butylene glycol ester. Polyester resin is the raw material for producing polyester fiber, polyester sheet and polyester hollow container. Polyester Fiber is currently the largest synthetic fiber in China. It is also used as raw materials for paints, dyes, pesticides, etc. V. Solvent. Organic Synthesis. Gas chromatographic analysis standard. VI. Solvent. Organic Synthesis. Gas chromatographic analysis standard. It is used to produce terephthalic acid and then ethylene Terephthalate; Polyester resin such as butylene glycol ester. Polyester resin is raw

Production method

1. Petroleum xylene and coal tar xylene all contain a considerable amount of p-xylene. Because the boiling point difference between p-and M-Xylene is only ℃, distillation separation method cannot be adopted. At present, the research and development methods at home and abroad are low-temperature crystallization separation method; Adsorption separation method and complexation separation method. The low-temperature crystallization separation method uses the difference of the melting point of the xylylene isomer to separate. The main method is cryogenic step-by-step crystallization. The technology is mature and currently it is dominant in the separation of xylylene. However, the equipment of this method is huge, p-xylene is limited by co-melting point, and the recovery rate is low, only 60-70%. Adsorption separation method is a new method developed in 1970 s. Compared with cryogenic crystallization method, this method has less investment, low total production cost, high p-xylene yield and high purity, and may replace cryogenic crystallization method. 2. The raw material toluene carries out the transalkyl reaction in the transalkyl reactor to generate xylylene and benzene. Mixed Xylenes in the heterogeneous reactor, part of M-Xylene is isomerized to generate p-xylene, and the reactants are mixed with the xylenes from the transalkyl section after removing the light fraction in the stabilization tower to enter the decoc9 fraction tower, mixed Xylenes with high p-xylene content are obtained at the top of the tower, and the tower kettle is composed of components above C9. Mixed Xylenes obtained from the top of the stabilization Tower enter the adsorption and separation section, and non-molecular sieve-type solid adsorbent is used to adsorb p-xylene, desorbing p-xylene products with purity as high as 99.9%, and at the same time producing m-dimethylbenzene by-product. In addition, there is hydrogen fluoride-boron trifluoride extraction method.