a c 8 Preparation method of aromatic hydrocarbon isomerization catalyst

Abstract

The invention discloses a preparation method for a C8 aromatic hydrocarbon isomerization catalyst, which includes the following steps: 1) supporting an active component onto a macro-pore forming agent, and drying the macro-pore forming agent to prepare a modified pore forming agent; 2) performing mix-kneading moulding to an EUO-type small-crystal-grain molecular sieve, a precursor of a melting-resistant oxide, the modified pore forming agent, a peptizer and water, and drying and roasting the mixture to prepare the catalyst. The preparation method is simple in processes and low in cost. The catalyst, when being used in isomerization of C8 mixed aromatic hydrocarbon containing ethylbenzene, has high ethylbenzene conversion rate and low aromatic hydrocarbon loss rate.

Description

technical field [0001] The present invention relates to a C 8 Process for the preparation of catalysts for the isomerization of aromatic hydrocarbons. The catalyst is used for C containing ethylbenzene 8 In the process of isomerization of mixed aromatics, it has the characteristics of higher conversion rate of ethylbenzene and lower loss rate of aromatics. Background technique [0002] In petrochemical production, C obtained from processes such as catalytic reforming or steam thermal cracking of hydrocarbon oils 8 In addition to p-, m-, and o-xylene, aromatic hydrocarbons also contain ethylbenzene. In order to meet the p-xylene requirements of synthetic fibers, appropriate methods are generally used to separate ethylbenzene, and the content of p-xylene is increased by means of adsorption separation and isomerization. However, since the boiling points of ethylbenzene and xylene are very close, the processing cost of directly separating ethylbenzene by high-efficiency rect...

AI Technical Summary

Problems solved by technology

[0007] CN101134171A discloses a C 8 A method for preparing an aromatic hydrocarbon isomerization catalyst, the method comprising mixing EUO molecular sieves and a binder to form a carrier, then introducing a VIII group metal, drying, calcining, and reducing the catalyst with a reducing gas. The catalyst EUO molecular sieve containing 5-90% by mass, 10-90% by mass of binder and 0.1-5.0% by mass of group VIII metal. Binder, because the pore structure of the catalyst is unreasonable, and the position of the hydrogenation active component is not ideal, the activity and diffusion performance become poor, so that the acid function and hydrogenation function of the catalyst cannot be well matched, resulting in isomerization reaction The activity and selectivity of the catalyst are not ideal

Images