A kind of toluene and ethylene selective alkylation catalyst and preparation method thereof

A selective and alkylation technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low conversion rate and reduced catalyst activity, reduce production costs, improve selectivity, The effect of short channel length

Active Publication Date: 2018-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method will significantly reduce the activity of the catalyst, even if the reaction is carried out at a very high temperature, the conversion rate is still low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] One preparation step of the catalyst of the present invention is as follows:

[0024] (1) Dissolve 90 grams of water-soluble corn starch (molecular weight 35000) in 300 grams of water, then add 10 grams of MCM-22 molecular sieve (particle size 0.6 microns, SiO 2 / Al 2 O 3 The molar ratio is 35), fully stirred into a uniform suspension, and vacuum spray dried (vacuum degree of 0.03MPa, drying temperature of 60℃, drying time of 5h) to obtain starch-embedded molecular sieve with an average particle diameter of 80 microns .

[0025] (3) Take 25 grams of the starch-embedded molecular sieve prepared in step (2) and 118 grams (76wt% on a dry basis) of aluminum hydroxide, namely SB powder, are thoroughly mixed, and then 85mL of a 0.1mol / L nitric acid solution is added and kneaded thoroughly , Make it into a paste-like plastic material, and form a cylindrical bar with a diameter of 1.5 mm on an extruder. The cylindrical bar is dried at 100°C for 16 hours, and then calcined in an air ...

Embodiment 2

[0028] An embodiment of the catalyst of the present invention is the same as that of Example 1. The difference is that the material content in each step is adjusted, MCM-49 (particle size is 0.8 microns, SiO 2 / Al 2 O 3 The molar ratio is 40) Substituting MCM-22 molecular sieve to obtain the catalyst composition, in terms of mass fraction, MCM-49: 3.0%, alumina: the balance. The evaluation results are shown in Table 1.

Embodiment 3

[0030] An embodiment of the catalyst of the present invention is the same as that in Example 1, except that the material content in each step is adjusted. The mass ratio of starch to molecular sieve is 5:1, and a starch-embedded molecular sieve with an average particle diameter of 50 microns is prepared. . The catalyst composition is obtained, in terms of mass fraction, MCM-22: 10%, alumina: the balance. The evaluation results are shown in Table 1.

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Abstract

The invention discloses a catalyst for selective alkylation of toluene and ethylene and a preparation method thereof. The method is to embed the MWW type molecular sieve with small grains in the organic matter, then mix it evenly with the precursor of the high-temperature resistant inert oxide, form, dry and roast to obtain the selective alkylation catalyst of toluene and ethylene. The catalyst of the present invention is particularly suitable for the selective alkylation of toluene and ethylene to synthesize p-methylethylbenzene. Compared with the existing technology, since the amount of molecular sieve in the catalyst is greatly reduced, not only the production cost of the catalyst is greatly reduced, but also the discharge of difficult-to-treat wastewater in the synthesis process of the molecular sieve is avoided, and it has high catalytic activity and p-methylethylbenzene selectivity. Sexual characteristics.

Description

Technical field [0001] The invention relates to a toluene and ethylene selective alkylation catalyst and a preparation method thereof. The catalyst is used in the reaction process of toluene and ethylene selective alkylation to synthesize p-methyl ethylbenzene. Background technique [0002] P-methyl ethyl benzene (PET) is the raw material for the production of a new polymer synthetic monomer p-methyl styrene. A new type of polymer material-poly(paramethylstyrene) is a high-performance plastic variety developed abroad in recent years. The various properties of this polymer are similar to those of polystyrene, maintaining good molding processability, and its specific gravity and heat resistance. , Flame retardancy, transparency and shrinkage rate are superior to existing polystyrene plastics (tensile strength 48MPa, elastic modulus 2210MPa, cantilever beam notched impact strength 16J / m, heat distortion temperature 95℃). In addition, p-methylstyrene can be copolymerized with other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70B01J29/74C07C2/66C07C15/02
Inventor 徐会青刘全杰贾立明王伟
Owner CHINA PETROLEUM & CHEM CORP
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