a c 8 Aromatic hydrocarbon isomerization catalyst and preparation method thereof

Abstract

The invention discloses a C8 aromatic hydrocarbon isomerization catalyst, and a preparation method thereof. The preparation method comprises following steps: EUO-type molecular sieve loaded with a hydrogenation active ingredient is coated with an organic matter, an obtained product is uniformly mixed with a precursor of a high temperature resistant indifferent oxide, and an obtained mixture is subjected to moulding, drying, and roasting so as to obtain the C8 aromatic hydrocarbon isomerization catalyst. The C8 aromatic hydrocarbon isomerization catalyst is especially suitable for isomerization of C8 mixed aromatic hydrocarbons containing ethylbenzene. Compared with the prior art, the C8 aromatic hydrocarbon isomerization catalyst possesses following advantages: molecular sieve using amount of the C8 aromatic hydrocarbon isomerization catalyst is reduced greatly, so that catalyst production cost is reduced greatly, and discharge of wastewater difficult to process in molecular sieve synthesis process is avoided; and ethylbenzene conversion rate is relatively high, and aromatic hydrocarbon loss ratio is relatively low.

Description

Technical field [0001] The present invention relates to a C 8 Aromatic isomerization catalyst and its preparation method. The catalyst is used in the process of isomerization of o-xylene and meta-xylene to p-xylene, and also involves C 8 Conversion of ethylbenzene in aromatics. Background technique [0002] In the production of petrochemical industry, C obtained from processes such as catalytic reforming or steam thermal cracking of hydrocarbon oil 8 In addition to para, meta, and o-xylene, aromatics also contain ethylbenzene. In order to meet the needs of synthetic fibers for p-xylene, 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 rectification or adsorption separation is high and economically uneconomical. Therefore,...

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Problems solved by technology

This method is a catalyst prepared by a conventional impregnation method. Due to the addition of a certain amount of binder, the effective utilization rate of the molecular sieve is reduced, the activity and diffusion performance are deteriorated, and the selectivity and stability of the catalyst are affected.