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Solid-acid-catalyzed method for synthesizing straight-chain alkyl-benzene

A technology of straight-chain alkylbenzene and solid acid catalysts, applied in chemical instruments and methods, molecular sieve catalysts, physical/chemical process catalysts, etc., can solve the problems of short single-pass life, easy deactivation, etc., and achieve good activity stability, Reduced energy consumption and high olefin conversion

Active Publication Date: 2014-04-02
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the solid acid alkylation process overcomes the shortcomings of the traditional hydrofluoric acid process, the current solid acid catalyst is easily deactivated, has a short single-pass life, and requires frequent regeneration operations

Method used

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  • Solid-acid-catalyzed method for synthesizing straight-chain alkyl-benzene
  • Solid-acid-catalyzed method for synthesizing straight-chain alkyl-benzene
  • Solid-acid-catalyzed method for synthesizing straight-chain alkyl-benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the synthesis of Al-KIT-1 type molecular sieve catalyst

[0029]Sodium silicate, cetyltrimethylammonium bromide, disodium edetate, distilled water, sodium hydroxide, and aluminum oxide monohydrate were mixed in a ratio of 1:0.25:1:60:0.15:0.2 (amount of substance ratio) to mix, stir evenly, put into the reaction kettle, keep the temperature at 100°C for 24h; use 2mol / L H2SO4 solution to adjust the pH=10.5, then heat at 100°C for 24h, adjust the pH=10.5, and then reheat After 24 hours, the product was taken out, washed repeatedly with distilled water until pH = 7, air-dried, calcined at 540°C in a nitrogen atmosphere for 1 h, and then calcined in air for 6 h to obtain Na-Al-KIT-1 powder. Pickle the Na-Al-KIT-1 powder with 0.1mol / L HNO3, control the solid-liquid mass ratio to 1:10, stir at room temperature for 0.5h, filter, wash repeatedly with distilled water until pH = 7, and then ℃ drying, extrusion molding, to obtain Al-KIT-1 molecular sieve catalyst. ...

Embodiment 2

[0030] Embodiment 2: the synthesis of Ti-KIT-1 type molecular sieve catalyst

[0031] Mix sodium silicate, cetyltrimethylammonium bromide, disodium edetate, distilled water, and sodium hydroxide in a ratio of 4:1:4:240:0.6 (mass ratio of substances), and stir After uniformity, put it into the reaction kettle, keep the temperature at 100°C for 24h; use 2mol / L H2SO4 solution to adjust the pH=10.5, keep the temperature at 100°C for 24h; adjust the pH=10.5 again, keep the temperature at 100°C for 24h; take out the product and repeat it with distilled water Wash until pH = 7, dry, and bake in air at 550°C for 6 hours to obtain Na-KIT-1 powder. Pickle the Na-KIT-1 powder with 0.1mol / L HNO3, control the solid-liquid mass ratio to 1:10, stir at room temperature for 0.5h, filter, wash repeatedly with distilled water until pH = 7, and then bake at 100°C Dry to obtain matrix KIT-1 molecular sieve. The matrix KIT-1 molecular sieve, butyl titanate and ethanol were stirred and mixed with ...

Embodiment 3

[0032] Embodiment 3: the synthesis of Mg-Ti-KIT-1 type molecular sieve catalyst

[0033] Mix sodium silicate, cetyltrimethylammonium bromide, disodium edetate, distilled water, and sodium hydroxide in a ratio of 4:1:4:240:0.6 (mass ratio of substances), and stir After uniformity, put it into the reaction kettle, keep the temperature at 100°C for 24h; use 2mol / L H2SO4 solution to adjust the pH=10.5, keep the temperature at 100°C for 24h; adjust the pH=10.5 again, keep the temperature at 100°C for 24h; take out the product and repeat it with distilled water Wash until pH = 7, dry, and bake in air at 550°C for 6 hours to obtain Na-KIT-1 powder. Exchange the Na-KIT-1 powder with 1.0mol / L ammonium nitrate aqueous solution, control the solid-liquid mass ratio to 1:10, stir and exchange at 90°C for 5.0h, filter, wash repeatedly with distilled water until pH=7, and then Dry at 100°C and calcined at 400°C for 3 hours to obtain the matrix KIT-1 molecular sieve. The matrix KIT-1 molecu...

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Abstract

The invention relates to a solid-acid-catalyzed method for synthesizing straight-chain alkyl-benzene, comprising the steps of: with straight-chain olefin having 10 to 14 carbon atoms and benzene as raw materials, and carrying out alkylation reaction with catalysis of a solid acid catalyst to obtain the straight-chain alkyl-benzene under the reaction condition that the temperature is 10-450 DEG C, the pressure is 0.1-15MPa, the mass ratio of the benzene to olefin substance is (2-100):1 and the total mass airspeed of feedstock is 0.1-20h<-1>, wherein the solid acid catalyst is mesoporous molecular sieve catalyst of M-KIT-1 type or a composite solid acid catalyst obtained by loading a modified compound on the mesoporous molecular sieve catalyst of M-KIT-1 type. The catalyst adopted in the method disclosed by the invention is free of corrosiveness, friendly to environment and has good activity stability. Stable operation time of a device is long so that a reactor is prevented from being switched between reaction and regeneration frequently.

Description

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. Background technique [0002] Linear alkylbenzene is the alkylation product of linear olefins and benzene under the action of a catalyst. The hydrofluoric acid-catalyzed alkylation process is widely used in industry to synthesize linear alkylbenzenes. Since hydrofluoric acid corrodes equipment and pollutes the environment, it has become an inevitable development trend to use non-corrosive and non-toxic solid acid catalysts to replace hydrofluoric acid catalysts, and to use environmentally friendly alkylation processes to synthesize linear alkylbenzenes. [0003] CN 1072353A discloses the use of Y-type molecular sieve modified by alkaline earth metals calcium, strontium, barium, etc. and rare earth metals lanthanum, cerium or mixed rare earths as a solid acid catalyst to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/70C07C15/107B01J29/03B01J31/18B01J31/16
Inventor 董平任杰齐泮仑金辉西晓丽袁海宽李建忠王桂芝何玉莲邵伟赵光辉邴淑秋崔锡红秦丽华包静严梁立伟邵荣兰贾云刚佟华芳张艳玲
Owner PETROCHINA CO LTD
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