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Method for synthesizing linear alkylbenzene

A technology of straight-chain alkyl benzene and synthesis method, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve problems such as unfavorable industrial production, high energy consumption, etc., and avoid frequent switching operations of reaction and regeneration. , high olefin conversion, high olefin conversion effect

Active Publication Date: 2008-10-22
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] Embodiment 1: the synthesis of Al-SBA-15 type 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 as 1:3.1:62.5:300:10000, weigh 20 grams of triblock polymer P123, mix with calculated amount of distilled water and hydrochloric acid, stir and mix at 40°C for 1 hour, add calculated amount of alumina monohydrate , continue to stir and mix for 1h; then, slowly add the calculated amount of tetraethyl orthosilicate under stirring conditions, and continue to stir for 5h at 40°C; crystallize at 100°C for 48 hours, then filter, wash, and dry. Finally, the temperature was programmed (at 100°C, 200°C, 300°C, and 400°C for 1h respectively) to 550°C for 5h, and the template agent was removed to obtain the Al-SBA-15 molecular sieve catalyst, which was designated as C-1 catalyst.

Embodiment 2

[0038] Embodiment 2: the synthesis of W-SBA-15 type molecular sieve catalyst

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

Embodiment 3

[0040] Embodiment 3: the synthesis of Ti-SBA-15 type molecular sieve catalyst

[0041] According to the molar ratio of raw materials P123:TiO 2 : SiO 2 :HCl:H 2 O is calculated as 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, stir and mix at 40°C for 1 hour; then, slowly add Add the calculated amount of ethyl orthosilicate, and add the calculated amount of butyl titanate (Jinshan Xingta Meixing Chemical Factory) at the same time, continue to stir at 40°C for 5h; crystallize at 100°C for 48 hours, and then filter , washed, dried, and finally programmed to heat up to 550 ° C for 5 hours to remove the template agent to obtain a Ti-SBA-15 molecular sieve catalyst, which is designated 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 invention relates to a method for synthesizing straight-chain alkylbenzenes, in particular to a method for synthesizing straight-chain alkylbenzenes using solid acid as a catalyst. (2) Background technology [0002] Linear alkylbenzene is the alkylation product of linear olefins and benzene under the action of a catalyst, and is the sulfonation raw material for the production of linear alkylbenzene sulfonate sodium detergent. The hydrofluoric acid-catalyzed alkylation process is widely used in industry to synthesize linear alkylbenzenes. Because hydrofluoric acid corrodes equipment, pollutes the environment, and is difficult to separate from alkylation products, non-corrosive, non-toxic solid acid catalysts are used instead of hydrofluoric acid catalysts, and linear alkylbenzenes are synthesized by environmentally friendly alkylation processes. become an inevitable development trend. [0003] CN1072353A discloses the use of Y-type molecular s...

Claims

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Application Information

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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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