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A kind of preparation method of ethylbenzene dealkylation catalyst

A technology of ethylbenzene dealkylation and catalyst, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve problems such as unsatisfactory location, poor activity and diffusion performance, and reduced effective utilization of molecular sieves. , to achieve the effect of ensuring the addition/dehydrogenation rate, improving the activity of the reaction, and increasing the diffusion rate

Active Publication Date: 2017-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst is prepared by a conventional impregnation method, and the position of the hydrogenation active component is not ideal, the effective utilization rate of the molecular sieve is reduced, and the activity and diffusion performance are deteriorated, so that the acid function and hydrogenation function of the catalyst are not very good. The matching of the catalyst leads to unsatisfactory activity and selectivity of the catalyst in the isomerization reaction

Method used

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  • A kind of preparation method of ethylbenzene dealkylation catalyst
  • A kind of preparation method of ethylbenzene dealkylation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (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.

[0022] (2) 45 grams of MCM-22 molecular sieve (particle size 0.6 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%, MCM-22: 45%, pore forming agent: 10%, alumina: the balance. The pore volume of the catalyst with a pore diameter of 1-10nm accounts fo...

Embodiment 2

[0025]With embodiment 1, difference is that substance content is adjusted in each step, MCM-49 (particle diameter is 0.8 micron, SiO 2 / Al 2 o 3 The molar ratio is 40) to replace the MCM-22 molecular sieve, and the catalyst composition is obtained as Pt: 0.02%, MCM-49: 30%, pore-forming agent: 10%, and alumina: the balance. See Table 2 for the evaluation results.

Embodiment 3

[0027] 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%, MCM-22: 35%, pore-forming agent: 10%, and alumina: the balance. See Table 2 for the evaluation results.

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Abstract

The invention discloses a preparation method of an ethylbenzene dealkylation catalyst, which includes the following contents: (1) loading active components on a macroporous pore-forming agent, and then drying to obtain a modified pore-forming agent; (2) adding MWW small-grain molecular sieves, precursors of refractory oxides, modified pore-forming agents, peptizers and water are kneaded, dried and calcined to obtain catalyst products. The preparation process of the method is simple and the cost is low, and the catalyst product is used in the isomerization process of C8 mixed aromatic hydrocarbons containing ethylbenzene, and has the characteristics of high conversion rate of ethylbenzene and selectivity of converting ethylbenzene into benzene.

Description

technical field [0001] The invention relates to a preparation method of an ethylbenzene dealkylation catalyst. The catalyst is used for C containing ethylbenzene 8 In the process of isomerization of mixed aromatics, it has the characteristics of high conversion rate of ethylbenzene and selectivity of conversion of ethylbenzene to benzene. 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 an increase in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/74C07C15/04C07C4/18C07C15/08C07C5/27
CPCY02P20/52
Inventor 王俊英李宝忠刘淑鹤刘春阳
Owner CHINA PETROLEUM & CHEM CORP
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