Catalyst used in alkylation reaction, preparation method and application of catalyst

A technology for an alkylation reaction and a catalyst is applied in the field of an alkylation reaction catalyst and its preparation to achieve the effects of high crystallinity, improved activity stability and reduced total synthesis time

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

[0008] In the above-mentioned prior art, the activity and selectivity of the alkylation reaction catalyst containing β molecular sieve or modified β molecular sieve need to be further improved

Method used

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  • Catalyst used in alkylation reaction, preparation method and application of catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Tetraethylammonium hydroxide (TEAOH) is used as template, and the raw materials are borax, sodium hydroxide and silica gel.

[0037] The feeding ratio is:

[0038] SiO 2 / B 2 o 3 =30;TEAOH / B 2 o 3 =3.6; Al 2 o 3 / B 2 o 3 =0

[0039] Na 2 O / B 2 o 3 = 2; H 2 O / B 2 o 3 =200.

[0040] The first stage reaction conditions: 120°C, time: 20 hours

[0041] Second stage reaction conditions: 140°C, time: 40 hours

[0042] The third stage reaction condition: 180°C, time: 8 hours.

[0043] The synthetic sample is A.

Embodiment 2

[0045] Tetraethylammonium hydroxide (TEAOH) is used as a template, and the raw materials are boric acid, sodium hydroxide and water glass.

[0046] The feeding ratio is:

[0047] SiO 2 / B 2 o 3 =55;TEAOH / B 2 o 3 =1.8; Al 2 o 3 / B 2 o 3 =0.5

[0048] Na 2 O / B 2 o 3 =12;H 2 O / B 2 o 3 =400.

[0049] The first stage reaction conditions: 140°C, time: 30 hours

[0050] Second stage reaction conditions: 150°C, time: 48 hours

[0051] The reaction condition of the third stage: 180°C, the time: 20 hours.

[0052] The main properties of the products obtained are listed in Table 1.

[0053] get sample B

[0054] Table 1B-Main physicochemical properties of β products

[0055] sample

Embodiment 3

[0057] The invention synthesizes modified B-beta zeolite C. Take 2000ml of A sample slurry, containing 400g of solid phase (on a dry basis), dilute the solid-liquid volume ratio to 1:10 with clean water, then add ammonium nitrate to make the concentration of ammonium nitrate in the solution 2.0M, stir, and heat up to 90 Stir at ~95°C for 2 hours at a constant temperature, then cool down to 5-60°C for filtration, and perform a second exchange of the wet filter cake under the same conditions as the first. The B-beta zeolite that has been exchanged twice with ammonium salts is washed until the pH reaches 5-6, and then placed in a drying oven and dried at 110-120° C. for 6 hours (dry basis is 88% by weight). The dried B-β zeolite is placed in a muffle furnace and rapidly raised to 250°C, kept at a constant temperature for 2 hours, then rapidly raised to 400°C, kept at a constant temperature for 4 hours, and finally raised to 540°C, kept at a constant temperature for 10 hours. Aft...

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Abstract

The invention discloses a catalyst used in an alkylation reaction, a preparation method and application of the catalyst. The catalyst comprises 60-90 percent by weight of beta zeolite and 10-40 percent by weight of inorganic oxide carrier. The catalyst is characterized in that the beta zeolite is boric beta zeolite, and the mol ratio of SiO2/B2O3 in the boric beta zeolite is 5-80. According to the preparation method of the catalyst, the boric beta zeolite is firstly synthesized, and then modified to be used for preparing the catalyst for the alkylation reaction. Compared with similar catalysts, the catalyst has higher ethylbenzene selectivity and higher activity stability in the process of synthesizing the ethylbenzene by liquid-phase alkylation of benzene and ethylene.

Description

technical field [0001] The invention relates to an alkylation reaction catalyst and its preparation method and application, in particular to a catalyst for preparing ethylbenzene by liquid-phase alkylation of benzene and ethylene, its preparation method and application. Background technique [0002] Ethylbenzene is mainly synthesized by the catalytic alkylation reaction of ethylene and benzene. The synthesis process of ethylbenzene generally includes two reactions, namely, the alkylation reaction of benzene and ethylene and the transalkylation reaction of polyethylbenzene and benzene. The production of ethylbenzene by liquid-phase alkylation of benzene and ethylene using molecular sieve catalysts has become a development trend. [0003] USP4891458 reports the synthesis of ethylbenzene under liquid-phase alkylation reaction conditions using a β zeolite catalyst, wherein the β molecular sieve is an ammonium or rare earth ion-exchanged molecular sieve. USP5227558 proposes a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70C07C15/073C07C2/66
Inventor 谷明镝
Owner CHINA PETROLEUM & CHEM CORP
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