Usefulness:

Solvents are widely used in coatings, resins, dyes, inks and other industries; for medical, explosives, pesticides and other industries, synthetic monomers or solvents; it can also be used as high octane gasoline components, is an important raw material for organic chemicals. It can also be used to remove the bitumen of the body. The hospital pathology is primarily used for tissue, slice of pilot and dewaxing.

The industrial neighborl xylene is a raw material, first washes the acid layer to the acid layer colorless, then use 10% sodium hydroxide solution, water is washed to pass, and the aqueous layer is separated, and the calcium chloride is borned with anhydrous carbon. After the distinction is low, the intermediate fraction is collected, that is, a pure product.

Production method:

1, from the boiling point according to the components of the crude benzene, the fraction of the boiling range 135 to 145 ° C is extracted with a rectification, and the xylene is obtained.

2 Extraction with diethylene glycol ether solvent, then distillation by towering, to give a product such as benzene, toluene, xylene.

3, toluene commissioning method. This method is to transfer a toluene methyl group to another 166 catalyst (zeolite hydrogen zeolite) under the action of catalyst to reformate toluene (nitrate stage) and reforming cyclic hydrogen (85% ~ 90%) as raw materials. The reaction temperature is 400 ± 2 ° C, and the pressure is 2 MPa or the like, and benzene and xylene are obtained.

4, petroleum light fraction mixed benzene by hydrotreating, catalyzed, and separated and separated. Or the coking crude benzene is washed, fractionated.