a c 8 Preparation method of aromatic hydrocarbon isomerization catalyst

A technology for isomerization and catalyst of aromatic hydrocarbons, which is applied in the field of preparation of isomerization catalysts, can solve problems such as unreasonable pore structure, poor activity and diffusion performance, unsatisfactory location of hydrogenation active components, etc., to achieve increased diffusion speed, Enhanced activity and selectivity effects

Active Publication Date: 2017-10-27
SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD +1
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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

Method used

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  • a c <sub>8</sub> Preparation method of aromatic hydrocarbon isomerization catalyst
  • a c <sub>8</sub> Preparation method of aromatic hydrocarbon isomerization catalyst

Examples

Experimental program
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Embodiment 1

[0025] (1) Dissolve chloroplatinic acid containing 0.3 g of platinum in 6 g of water, fully mix 10 g of 200-mesh cellulose with the above solution, and dry the mixture at 80°C for 6 hours to obtain platinum-loaded cellulose.

[0026] (2) 45 grams of EU-1 molecular sieve (particle size 0.3 microns, SiO 2 / Al 2 o 3 The molar ratio is 35), 72 grams (dry basis 76%) aluminum hydroxide is SB powder, the cellulose that loads platinum prepared in step (1), 50ml concentration is that the nitric acid solution of 0.2M and 30ml water are fully kneaded, make it become The paste-like plastic material is shaped into a cylindrical strip with a diameter of 1.5 mm on an extruder, and the cylindrical strip is dried at 110° C. for 8 hours, and then calcined at 650° C. for 4 hours in an air atmosphere to obtain a catalyst. The catalyst is composed of Pt: 0.3%, EU-1: 45%, pore-forming agent: 10%, alumina: balance. The pore volume of the catalyst with a pore diameter of 1-10nm accounts for 7.51% o...

Embodiment 2

[0029] With embodiment 1, difference is that substance content is adjusted in each step, ZSM-50 (particle diameter is 0.7 micron, SiO 2 / Al 2 o 3 The molar ratio is 40) to replace the EU-1 molecular sieve to obtain a catalyst composition of Pt: 0.02%, ZSM-50: 30%, pore-forming agent: 10%, and alumina: the balance. See Table 2 for the evaluation results.

Embodiment 3

[0031] Same as Example 1, the difference is that the substance content in each step is adjusted, and the obtained catalyst composition is Pt: 0.02%, EU-1: 35%, pore former: 10%, alumina: balance. See Table 2 for the evaluation results.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/74C07C15/073C07C15/08C07C5/27
CPCY02P20/52
Inventor 王俊英赵光宇刘淑鹤郭宏山
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD
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