Aromatic hydrocarbon alkylation catalyst and application thereof

A kind of aromatic hydrocarbon alkylation and catalyst technology, applied in chemical engineering and green chemistry field, can solve problems such as short active life, achieve the effect of prolonging life, improving stability and reducing production cost

Inactive Publication Date: 2015-05-20
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and deficiencies in the prior art, the aromatic hydrocarbon alkylation catalyst and the preparation method thereof of the present invention solve the problems of rapid decline in activity and short life of the catalyst during use, and effectively improve the conversion rate and selectivity of the product

Method used

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  • Aromatic hydrocarbon alkylation catalyst and application thereof
  • Aromatic hydrocarbon alkylation catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: After mixing fly ash and montmorillonite at a mass ratio of 0.25:9.75, take 10 g of the mixture and add it to 1000 ml of 4.5 mol / L sulfuric acid solution, and place it for 6 hours for acidification; The sulfuric acid was evaporated to dryness at ℃;

[0020] Step 2: Take out the dried product of step 1, add 0.5ml hexamethyldisilazane, and add a certain amount of adhesive alumina, the mass ratio of alumina to dried product is 1:0.5, stir well, Finally, the mixture is calcined in a muffle furnace at 300° C. for 8 hours;

[0021] Step 3: The substance obtained in Step 2 is washed three times with distilled water, deionized water, and analytically pure anhydrous ethanol, and the washed product is dried under 60°C vacuum to obtain an aromatic hydrocarbon alkylation catalyst.

[0022] The performance of the catalyst was evaluated in a miniature continuous flow fixed bed reactor under normal pressure. The loading amount of the catalyst was 5mL, and the temperature cont...

Embodiment 2

[0025] The difference between this example and Example 1 is that the ratio of fly ash to montmorillonite is 0.5:9.5, and the results of measured p-xylene conversion and selectivity are shown in Table 1.

Embodiment 3

[0027] The difference between this example and Example 1 is that the ratio of fly ash to montmorillonite is 0.75:9.25, and the results of measured p-xylene conversion and selectivity are shown in Table 1.

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Abstract

The invention discloses an aromatic hydrocarbon alkylation catalyst and an application thereof. The catalyst comprises a carrier and a reaction center, wherein the carrier comprises pulverized fuel ash and montmorillonite, and the reaction center comprises organic silicon. Compared with an existing catalyst, the aromatic hydrocarbon alkylation catalyst disclosed by the invention takes the pulverized fuel ash and montmorillonite as the carrier and takes an organic silicon compound as the reaction center so as to ensure that the catalytic action on alkylation reaction can be achieved; according to the catalyst, the pulverized fuel ash and montmorillonite are proportioned to be taken as the carrier of an acid-basic center, so that the catalytic effects can be achieved, the stability of the catalyst can also be improved, the selectivity of p-xylene can be improved, and the service life of the catalyst can be prolonged; and meanwhile, the production cost can also be reduced by using the cheap pulverized fuel ash.

Description

technical field [0001] The invention belongs to the fields of chemical engineering and green chemistry, and in particular relates to an aromatic hydrocarbon alkylation catalyst used for petroleum intermediate products and its application. Background technique [0002] The alkylation of aromatic hydrocarbons refers to the process of transferring the alkyl group of small molecules to the benzene ring or the side chain of the benzene ring under certain conditions. In petrochemical industry, it is usually produced by reactions such as toluene shape-selective disproportionation and toluene-methanol alkylation. Its product, p-xylene, is a very important raw material for synthetic fibers and plastics. It can be used to produce purified terephthalic acid (PTA) and dimethyl terephthalate (DMT). It is widely used in fiber, Film and resin preparation. [0003] Generally, catalytic alkylation is used in industry to produce the desired product, and commonly used catalysts include ZSM-5...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C07C15/08C07C2/86
CPCY02P20/52
Inventor 李宇亮徐永胜戴书琪张文杉杨思语汪萌
Owner CHANGAN UNIV
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