Method for preparing toluene disproportionation zeolitic catalyst with increased para-selectivity

A zeolite catalyst, toluene disproportionation technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of cumbersome preparation process, low conversion rate, expensive solvent used, etc., and achieve simple process and good effect. , the effect of low cost
CN1762593AInactive Publication Date: 2006-04-26NANJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF TECH
Publication Date
2006-04-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method for zeolite catalyst to enhance para-position selectivity for toluene disproportionation, which comprises: adding natural clay adhesive and assist-extrusion agent contained alumina and silicon dioxide into hydrogen-type zeolite powder to form, treating with organic acid; using ethyl silicate for chemical liquid-phase deposition modification to dried sample; baking, aging, baking, and treating with 100% water vapor. This product can improve selectivity obviously, can achieve 96.5wt% to xylene selectivity when the toluene conversion is 23wt%, and needs low cost.
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Description

Technical field:

[0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a zeolite catalyst for increasing para-selective toluene shape-selective disproportionation. Background technique:

[0002] Paraxylene (PX) is the main raw material for the production of purified terephthalic acid (PTA) in the polyester industry. Industrially, reformed gasoline, pyrolysis gasoline, toluene, C 9 C 8 Aromatics, but only xylenes with thermodynamic equilibrium composition (para: meta: ortho = 24%: 53%: 23%) can be obtained. , p-xylene must be obtained through adsorption separation or crystallization separation, and this separation process is complicated and consumes a lot of energy.

[0003] Chang et al. pointed out in J.Amer.Chem.Soc.101(6783), 1979 that p-xylene could be selectively generated by using medium and microporous zeolites such as ZSM-5 zeolite for shape-selective disproportionation of toluene. ZSM-5 zeolite has a pore system...

Claims

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