C8 aromatic hydrocarbon isomerization catalyst and preparation method and application thereof

A kind of aromatic hydrocarbon isomerization and catalyst technology, applied in the field of conversion of ethylbenzene in C8 aromatic hydrocarbons, can solve the problems of high loss of xylene, lower product yield and the like, and achieve the effects of reducing energy consumption, improving yield and high yield

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A potential problem in the above prior art is that the ethylbenzene in the raw material is converted into benzene and C through dealkylation. 2 fraction, the benzene and C must then be 2 Fractions are separated from process streams or converted
Although this method can increase the p-xylene equilibrium concentration in the product, the method causes many xylene losses, and the product yield decreases.

Method used

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  • C8 aromatic hydrocarbon isomerization catalyst and preparation method and application thereof
  • C8 aromatic hydrocarbon isomerization catalyst and preparation method and application thereof

Examples

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preparation example Construction

[0021] Provide a kind of specific preparation method of catalyst of the present invention below, but not limited to this method, concrete steps are:

[0022] (1) loading the rare earth on the molecular sieve, drying and roasting to obtain the rare earth modified molecular sieve;

[0023] (2) loading zirconium on the inorganic refractory oxide, drying and roasting to obtain zirconia modified inorganic refractory oxide;

[0024] (3) Fully knead the rare earth modified molecular sieve, zirconia modified inorganic refractory oxide, extrusion aid, water and peptizing agent into a plastic paste, extrude into strips, dry and roast to obtain the catalyst carrier of the present invention ;

[0025] (4) The active metal-containing component is loaded on the carrier by a conventional impregnation method, and then dried and calcined to obtain the xylene isomerization catalyst of the present invention.

[0026] The rare earth described in step (1) can be loaded on the molecular sieve by ...

Embodiment 1

[0036] The preparation of catalyst E-1 of the present invention

[0037] (1) Preparation of EUO molecular sieves.

[0038] The EUO molecular sieve used in the present invention is prepared according to the method of US Pat. 2 / g, pore volume 0.19mL / g.

[0039] The zeolite synthesized above contains alkali metal or alkaline earth metal cations, which are exchanged with ammonium cations, and then roasted in the air at 316°C to 540°C for 1 to 10 hours, and the obtained acidic molecular sieve is numbered S-1, which forms acidic zeolite methods are well known in the art.

[0040] (2) getting 1000 grams of mass concentration as lanthanum nitrate solution of 20% (calculated as lanthanum oxide) and 800 grams of S-1 molecular sieves is fully mixed, then dried at 130°C for 24 hours, and roasted at 750°C for 3 hours, A modified S-1 molecular sieve with a mass content of lanthanum oxide of 20% was obtained. The number is LS-1 molecular sieve.

[0041] (3) 500 grams of mass concentrat...

Embodiment 2

[0045] The preparation of catalyst E-2 of the present invention

[0046] The preparation process of the catalyst E-2 of the present invention is the same as in Example 1, except that cerium nitrate is used to replace lanthanum nitrate, and the prepared catalyst of the present invention is numbered E-2, its physicochemical properties are shown in Table 3, and the reaction results are shown in Table 4 .

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Abstract

The invention relates to a C8 aromatic hydrocarbon isomerization catalyst and a preparation method and application thereof. The catalyst consists of a rare earth-modified molecular sieve, zirconia-modified inorganic refractory oxide and at least one type of group VIII precious metal, the molecular sieve is an EUO molecular sieve, the weight ratio of the content of the rare earth-modified molecular sieve to the content of the zirconia-modified inorganic refractory oxide is 10:90 to 90:10, and the content of the group VIII precious metal is 0.1 to 10 percent by metal weight; in the rare earth-modified molecular sieve, the content of rare earth oxide is 0.5 to 60.0 percent by massweight; and in the zirconia-modified inorganic refractory oxide, the content of zirconia is 0.1 to 50.0 percent by massweight. Compared with the prior art, the catalyst can isomerize dimethylbenzene and selectively convert ethylbenzene into p-xylene when being used in C8 aromatic hydrocarbon isomerization, the concentration of the p-xylene in the dimethylbenzene in the product reaches or approximates a thermodynamic equilibrium value, and the yield of the dimethylbenzene is high.

Description

technical field [0001] The present invention relates to C 8 Catalyst for the catalytic conversion of aromatic hydrocarbons and its preparation method and application, especially a catalyst for the isomerization of o-xylene and m-xylene into p-xylene, its preparation method and application, and also relates to C 8 Conversion of ethylbenzene in aromatics. Background technique [0002] In the petrochemical production process, C obtained from various processes 8 Among aromatic hydrocarbons, in addition to p-, m-, and o-xylene, ethylbenzene is also contained. Using this as a raw material, p-xylene products can be obtained through combined operations such as isomerization, rectification and adsorption separation. Since the boiling points of ethylbenzene and xylene are very close, the separation is difficult, resulting in the accumulation of ethylbenzene in the recycle stream of the combined unit, resulting in an increase in the flow rate of the combined isomerization unit, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74C07C5/27C07C15/08
CPCY02P20/52
Inventor 徐会青刘全杰贾立明张喜文王伟
Owner CHINA PETROLEUM & CHEM CORP
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