A kind of hydrogen type zsm-35/eu-1 eutectic zeolite, aromatic hydrocarbon isomerization catalyst and its preparation method and application

Abstract

The present invention relates to a hydrogen type ZSM‑35 / EU‑1 eutectic zeolite, and an aromatic hydrocarbon isomerization catalyst containing the eutectic zeolite, a preparation method and application thereof. The zeolite is prepared by the following method: step 1): a certain amount of Add EU‑1 zeolite into NaOH solution, stir well, add template agent, silicon source and water, stir well; step 2): transfer the solution to a stainless steel kettle, crystallize at 100~300℃ for 12~36 hours, then take it out , cooled to room temperature, washed with water until neutral, filtered and dried to obtain ZSM‑35 / EU‑1 eutectic zeolite. The arene isomerization catalyst comprises, by weight: 10.0-80.0w% hydrogen ZSM-35 / EU-1 eutectic zeolite, 15.0-90.0w% binder, 0.1-5.0w% element periodic table Group VIIB metal rhenium. It can be applied to the catalytic reaction process of ethylbenzene dealkylation-type C8 aromatics isomerization, effectively reducing the hydrogenation side reaction after ethylbenzene dealkylation.

Description

A hydrogen-type ZSM-35 / EU-1 eutectic zeolite, aromatic hydrocarbon isomerization catalyst and preparation method thereof law and application technical field [0001] The present invention relates to a catalyst for the isomerization of aromatic hydrocarbons. Xylene isomerization unit for aromatics complex Yuan, the raffinate oil after separating the target product p-xylene (or o-xylene) is isomerized into xylene close to thermodynamic equilibrium product, while part of the ethylbenzene in the raw material is converted into benzene. Background technique Because the boiling point of ethylbenzene is only 2.2 ℃ worse than PX, it is very difficult and difficult to separate ethylbenzene and xylene by rectifying method. Economical, so ethylbenzene must be converted during xylene isomerization. Depending on the ethylbenzene conversion pathway, the industrial C8 Aromatic isomerization technology can be divided into two types: ethylbenzene conversion type and ethylbenzene dea...

AI Technical Summary

Problems solved by technology

[0006] The C8 arene isomerization catalyst using zeolite as the acidic component and Group VIII noble metal as the metal component has been applied industrially, showing good catalytic performance, but there is still a problem of mismatch between the acidic active center and the metal active center

In the ethylbenzene dealkylation type C8 aromatics isomerization catalyst, even if the Group VIII noble metal content is controlled below 0.05%, there will be a problem of high non-aromatic hydrocarbon content that azeotropes with benzene, reducing the azeotropic concentration of benzene at a low boiling point. Purity in Boilers Affects Yield and Energy Consumption in Aromatics Complexes

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