Synthesis method of linear alkylbenzene

A technology of straight-chain alkyl benzene and synthesis method, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of short single-pass life, easy deactivation of catalysts, etc., and achieve good activity stability, olefinic High conversion rate and low energy consumption

Inactive Publication Date: 2006-11-29
ZHEJIANG UNIV OF TECH
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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 prone to deactivation and has a short single-pass life. The solid acid process requires frequent switching operations between alkylation reaction and catalyst regeneration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The synthesis method provided by the present invention is used to synthesize the niobium phosphorus aluminum molecular sieve, which is denoted as C-1.

[0031] According to the molar ratio of raw materials is Al 2 o 3 :P 2 o 5 : Nb 2 o 5 :TPPA:ETHA:OXAA:H 2 O is calculated as 1: 0.660: 0.152: 0.802: 4.705: 0.121: 46.507, weigh 20 grams of monohydrate alumina, and 20 grams of phosphoric acid (H 3 PO 4 , 85Wt%), 7.8 grams of niobic acid, 15.1 grams of tri-n-propylamine (TPPA), 28.5 grams of ethanol (ETHA), 2 grams of oxalic acid (OXAA), and 110 grams of deionized water to prepare a mixed solution, stir well and place in crystal crystallization at 150°C for 3 days in a reaction kettle; then filtered, washed, dried, and calcined at 550°C for 5 hours to obtain anhydrous chemical composition (Nb 0.084 Al 0.552 P 0.364 )O 2 The niobium phosphorus aluminum molecular sieve, the X-ray powder diffraction experiment results are shown in Table 1, and its spectrum characte...

Embodiment 2

[0036] Using the synthesis method provided by the present invention, a magnesium-niobium-phosphorus-aluminum molecular sieve containing magnesium-substituting elements is synthesized, which is denoted as C-2.

[0037] According to the molar ratio of raw materials Al 2 o 3 :P 2 o 5 : Nb 2 o 5 :MgO:TPPA:ETHA:OXAA:H 2 O is 1: 0.541: 0.038: 0.227: 0.758: 2.353: 0.061: 27.482 calculation, weigh 40 grams of monohydrate alumina, and 32.8 grams of phosphoric acid (H 3 PO 4 , 85Wt%), 3.9 gram niobic acid, 12.8 gram magnesium acetate, 28.5 gram tri-n-propylamine (TPPA), 28.5 gram ethanol (ETHA), 2 gram oxalic acid (OXAA), 130 gram deionized water, prepare mixed solution, stir After uniformity, place it in a crystallization reaction kettle and crystallize at 150°C for 3 days; then filter, wash, dry, and roast at 550°C for 5 hours to obtain anhydrous chemical composition (Mg 0.067 Nb 0.022 Al 0.591 P 0.320 )O 2 The magnesium-niobium-phosphorus-aluminum molecular sieve substitu...

Embodiment 3

[0040] The boron-niobium-phosphorus-aluminum molecular sieve containing boron substituting elements is synthesized by adopting the synthesis method provided by the present invention, which is denoted as C-3.

[0041] According to the molar ratio of raw materials Al 2 o 3 :P 2 o 5 : Nb 2 o 5 :B 2 o 3 :TPPA:ETHA:OXAA:H 2 O is 1: 0.432: 0.038: 0.191: 0.756: 2.352: 0.304O: 25.368 calculation, weigh 40 grams of monohydrate alumina, and 26.2 grams of phosphoric acid (H 3 PO 4 , 85Wt%), 3.9 grams of niobic acid, 6.2 grams of boric acid, 28.5 grams of tri-n-propylamine (TPPA), 28.5 grams of ethanol (ETHA), 10 grams of oxalic acid (OXAA), 120 grams of deionized water, prepare a mixed solution, stir well Afterwards, it was placed in a crystallization reactor and crystallized at 150°C for 3 days; then filtered, washed, dried, and roasted at 550°C for 5 hours to obtain anhydrous chemical composition (B 0.115 Nb 0.023 Al 0.602 P 0.260 )O 2 The boron-niobium-phosphorus-aluminu...

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Abstract

A process for preparing straight-chain alkylbenzene from C2-C20 straight-chain olefine and benzene features the alkylating reaction between benzene and olefine in the ratio of (2-100):1 in supercritical condition (290-450 deg.C and 5-15 MPa) under the action of solid acid catalyst. Said catalyst is the P-Al molecular sieve with AIPO4-5 crystal structure or the P-Al molecular sieve composition containing substitute element.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/107C07C2/66B01J29/89B01J29/83
CPCY02P20/54
Inventor 任杰金辉黄国文
Owner ZHEJIANG UNIV OF TECH
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