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Method for synthesizing linear alkylbenzene

A technology for the synthesis of straight-chain alkylbenzenes, which is applied to chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of unfavorable industrial production and high energy consumption, and avoid frequent switching operations of reaction and regeneration , high conversion rate of olefins, and the effect of saving investment

Active Publication Date: 2011-05-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the reaction temperature and pressure are high and the energy consumption is large, it is not conducive to industrial production. Therefore, it is necessary to find a catalyst that can also have higher olefin conversion and reaction selectivity under lower temperature and pressure conditions. Adapt to the needs of industrial production

Method used

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  • Method for synthesizing linear alkylbenzene
  • Method for synthesizing linear alkylbenzene
  • Method for synthesizing linear alkylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Synthesis of Al-SBA-15 Molecular Sieve Catalyst

[0037] According to the molar ratio of raw materials P123:Al 2 O 3 : SiO 2 :HCl:H 2 O is calculated at 1:3.1:62.5:300:10000, weigh 20 grams of triblock polymer P123, mix with the calculated amount of distilled water and hydrochloric acid, stir and mix at 40 ° C for 1 h, add the calculated amount of alumina monohydrate , continue to stir and mix for 1 h; then, slowly add the calculated amount of ethyl orthosilicate under stirring conditions, continue to stir at 40 ° C for 5 h; crystallization reaction at 100 ° C for 48 hours, followed by filtration, washing, drying, Finally, the temperature was programmed (1h at 100°C, 200°C, 300°C, and 400°C, respectively) to 550°C for 5 hours, and the template agent was removed to obtain Al-SBA-15 type molecular sieve catalyst, which was denoted as C-1 catalyst.

Embodiment 2

[0038] Example 2: Synthesis of W-SBA-15 Molecular Sieve Catalyst

[0039] According to the molar ratio of raw materials, P123: EtOH: WO 3 : SiO 2 :HCl:H 2 O is calculated at 1:200:6.25:62.5:350:13000, weigh 20 grams of triblock polymer P123, mix with the calculated amount of distilled water, ethanol and hydrochloric acid, stir and mix at 40 ° C for 1 h, add the calculated amount of Tungstic acid, continue to stir and mix for 1 h; then, slowly add the calculated amount of ethyl orthosilicate under stirring conditions, continue to stir at 40 ° C for 5 h; crystallization reaction at 100 ° C for 48 hours, followed by filtration, washing, After drying, the temperature was finally programmed to 550°C for 5 hours, and the template agent was removed to obtain the W-SBA-15 molecular sieve catalyst, which was denoted as C-2 catalyst.

Embodiment 3

[0040] Example 3: Synthesis of Ti-SBA-15 Molecular Sieve Catalyst

[0041] According to the molar ratio of raw materials, P123:TiO 2 : SiO 2 :HCl:H 2 O is calculated at 1:6.25:62.5:350:13000, weigh 20 grams of triblock polymer P123, mix with the calculated amount of distilled water and hydrochloric acid, and stir and mix at 40 ° C for 1 h; then, slowly add under stirring conditions The calculated amount of ethyl orthosilicate was added simultaneously with the calculated amount of butyl titanate (Jinshan Xingta Meixing Chemical Plant), and the stirring was continued for 5 hours at a temperature of 40 °C; the crystallization reaction was carried out at 100 °C for 48 hours, followed by filtration , washing, drying, and finally the temperature was programmed to 550 ℃ for 5 hours, and the template agent was removed to obtain a Ti-SBA-15 molecular sieve catalyst, which was denoted as C-3 catalyst.

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Abstract

The invention provides a synthetic method for linear alkylbenzene. By taking linear olefin containing 2 to 20 carbon atoms and benzene as raw materials under the reaction condition of a temperature being 10 to 450 DEG C, a pressure being 0.1 to 15MPa, the ratio of the amount of substances of benzene and the olefin is 2 to 100:1 and the airspeed of a feeding total mass is 0.1 to 20 h<-1>, and an alkylation reaction is carried out by catalyzing by a solid acid catalyst, the linear alkylbenzene is obtained. The solid acid catalyst is M-SBA-15 typed mesopore molecular sieve catalyst or compound solid acid catalyst which is obtained by modifying the M-SBA-15 typed mesopore molecular sieve catalyst. The catalyst adopted by the invention has no corrosion, is friendly to environment and has good activity stability; therefore, higher olefin conversion and reaction selectivity can also be obtained even under comparatively lower temperature. Furthermore, the device is stable and has long operation time; therefore, frequent switching operation on the reaction and regeneration of the reactor can be avoided.

Description

(1) Technical field [0001] The present invention relates to a kind of synthetic method of straight-chain alkylbenzene, especially a kind of synthetic method of straight-chain alkylbenzene using solid acid as catalyst. (2) Background technology [0002] Linear alkyl benzene is the alkylation product of linear olefin and benzene under the action of catalyst, and is the sulfonated raw material for the production of linear alkyl benzene sodium sulfonate detergent. The alkylation process catalyzed by hydrofluoric acid is widely used in industry to synthesize linear alkylbenzenes. Since hydrofluoric acid corrodes equipment, pollutes the environment and is difficult to separate from alkylation products, the use of non-corrosive and non-toxic solid acid catalysts to replace hydrofluoric acid catalysts has been become an inevitable development trend. [0003] CN1072353A discloses using Y-type molecular sieve modified by alkaline earth metals calcium, strontium, barium, etc. and rar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/66B01J29/03
CPCY02P20/52
Inventor 任杰郑利武金辉
Owner ZHEJIANG UNIV OF TECH
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