ZSM-5 molecular sieve catalyst for catalytic preparation of xylene from coked benzene and methanol and use thereof

Abstract

The invention provides a ZSM-5 molecular sieve catalyst for catalytic preparation of xylene from coked benzene and methanol and a use thereof. A preparation method of the ZSM-5 molecular sieve catalyst comprises blending 45-90wt% of a hydrogen-type ZSM-5 molecular sieve, 10-50wt% of a binder, 1-20wt% of sesbania cannabina powder and a dilute nitric acid solution as an assistant by stirring to obtain a uniform mixture, drying and roasting the mixture, extruding the mixture to obtain a strip, immersing the strip in a solution containing one or two of Mg, Zn, Gd, P, La, Ce, Mo and Ni, and carrying out drying and roasting so that the strip is loaded with the metals. In catalytic alkylation reaction preparation of xylene from coked benzene and methanol, the ZSM-5 molecular sieve catalyst has high catalytic activity, high stability, a high raw material effective conversion rate and high desired product xylene selectivity, improves the existing xylene production technology, improves a coal-derived coked benzene utilization rate and realizes change of waster into valuables.

Description

technical field [0001] The invention relates to a molecular sieve catalyst, in particular to a ZSM-5 molecular sieve catalyst which catalyzes the coking of benzene and methanol to prepare xylene and its application. Background technique [0002] Xylene is an important basic chemical raw material, which is widely used as a solvent in coatings, resins, dyes, inks and other industries; as a synthetic monomer or solvent in pharmaceuticals, explosives, pesticides and other industries; it can also be used as high-octane gasoline It is an important raw material of organic chemical industry. It can also be used to remove asphalt from car bodies. Hospital pathology departments mainly use preparations. It can also be used for dehydration and dewaxing. Adsorption, separation and isomerization of xylene can also obtain p-xylene PX, and terephthalic acid PTA can be obtained from p-xylene after oxidation, and terephthalic acid can be further synthesized into important polymer materials...

AI Technical Summary

Problems solved by technology

However, in these two patents, the former only proposes a process method, but does not discuss in detail the key technology catalyst, and its product is mainly toluene, the economic benefit is relatively low, and the industrial production use is relatively low; The catalyst has been discussed, but the selectivity of the target product xylene is relatively low, the utilization rate of raw material methanol is not high, and the economic benefit of industrial production is not high