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1,4-Xylene;1,4-Dimethylbenzene;p-Xylene;p-Dimethylbenzene;Benzene, 1,4-dimethyl-
Molecular formula : C8H10
MW : No. Using 106.17

nature : a colorless liquid. 13.263 ° C melting point, boiling point, 138.37 ° C and 27.2 ° C flashpoint. The relative density (20 / 4 ° C) 0.8611 (25 / 4 ° C) 0.8610, refractive index (nD25) 1.4958 (nD21) 1.5004. At low temperature Flake into colorless crystal or prism. With ethanol, ethyl ether, acetone and benzene immiscibility, do not dissolve in water. Explosion limits of 1% -6% (volume).

Preparation : 1. Oil xylene, xylene coal tar, contain considerable amount of xylene. Because right, m-xylene the boiling point difference only 0.75 ° C, it can not be used distillation separation, the current domestic and international research and development is low-temperature crystal separation, adsorption and separation complex separation. Low-temperature separation crystallization using xylene isomers difference between the melting point for separation, the main method of cryogenic fractional crystallization, mature technology, the separation of xylene advantage. But this method has a huge equipment, a total of p-xylene by the melting point of the restrictions, and low recycling rate is only 60-70%. Adsorptive separation of the 1970s development of new methods, this method than cryogenic crystallization small investment, the total production of low cost, high yield of p-xylene, high purity, it is possible to replace the deep cold crystallization. 2. Raw materials transfer alkylation of toluene in the bioreactor, transalkylation, xylene and benzene formation. The mixed xylene isomerization reactor, making some of m-xylene isomerization generation of xylene, in a stable reaction tower removed after the light distillate Section alkyl transfer to enter the mixed xylene from C9 fraction tower, the tower was right xylene higher levels of mixed xylene, tower above reactor components for the C9 . Tata stable from the top of mixed xylene into the adsorption separation section, the use of non-solid molecular sieve adsorbent right xylene, desorption with purity as high as 99.9% of the products of p-xylene, m-xylene product. In addition, hydrogen fluoride-BF3 extraction.

purposes : for the production of terephthalic acid, thereby producing terephthalate, butylene and other polyester resin. Polyester resin production of polyester fiber, polyester sheet, polyester hollow containers of raw materials. Continued fiber of the country's largest synthetic fiber. Also used as coatings, dyes and pesticides such as raw materials.

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More Detailed Data:
1) 1,4-Xylene;p-Dimethylbenzene;1,4-dimethyl-Benzene;1,4-dimethylbenzene;4-methyltoluene;4-xylene;1,4-dimethyl-benzen;chromar;p-methyltoluene;p-xylene
2) 1,4-xylene;p-xylene
3) 1,4-xylene;p-xylene
4) p-xylene;1,4-dimethylbenzene
5) p-xylene
6) Right xylene
7) 1,3-xylene;p-xylene
8) 1,3-xylene;p-xylene
9) 2-Fluoro-1,4-Dimethylbenzene;2-Fluoro-p-Xylene
10) (r)-(-)-1,2-propanediol;2-Fluoro-1,4-Dimethylbenzene;2-Fluoro-p-Xylene
Notice Some description was translated by software and the data is only as a reference.
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