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Method for catalytically synthesizing long-chain alkyl aromatic hydrocarbons

A technology for long-chain alkyl aromatic hydrocarbons and a synthesis method, which is applied in the field of catalytic synthesis of long-chain alkyl aromatic hydrocarbons, can solve the problems of difficulty in evaluating the activity stability of solid acid catalysts, difficulty in large-scale continuous production, poor activity stability, and the like, and achieves The effect of good catalyst activity stability, high product linearity and high selectivity

Active Publication Date: 2020-08-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] These batch alkylation reaction methods are not easy to achieve large-scale continuous production, and it is difficult to evaluate the activity stability of solid acid catalysts
At present, the prominent problem of solid acid catalysts for the synthesis of long-chain alkylaromatics is the problem of poor activity and stability. Through the optimization of solid acid catalyst design and optimization of alkylation reaction conditions, improving the activity and stability of solid acid catalysts is the key to the development of long-chain alkanes. The Development Direction of Solid Acid Catalytic Synthesis of Aromatic Hydrocarbons

Method used

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  • Method for catalytically synthesizing long-chain alkyl aromatic hydrocarbons
  • Method for catalytically synthesizing long-chain alkyl aromatic hydrocarbons
  • Method for catalytically synthesizing long-chain alkyl aromatic hydrocarbons

Examples

Experimental program
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Effect test

Embodiment 1

[0067] The preparation of embodiment 1 Sr-Al-SBA-15 molecular sieve catalyst

[0068] (1) According to the molar ratio P123: Al 2 o 3 : SiO 2 :H 3 PO 4 :SrO:H 2 O is calculated as 1:3.0:63.0:310:1.0:10000, weigh 20g of triblock polymer P123, mix with calculated amount of distilled water and phosphoric acid, stir and mix at 40°C for 1h, add calculated amount of monohydrate oxidation Aluminum and strontium nitrate, continue to stir and mix for 1 hour; then, slowly add the calculated amount of tetraethyl orthosilicate under stirring conditions, continue stirring at 40°C for 5 hours; crystallize at 95°C for 48 hours, then filter and wash , dried, and finally in a muffle furnace at a heating rate of 2°C / min from 25°C to 550°C, and roasted at a constant temperature for 5 hours to remove the template agent to obtain Sr-Al-SBA-15 molecular sieve powder, whose Al 2 o 3 with SiO 2 The molar ratio is 0.0476, SrO and SiO 2 The molar ratio was 0.0159. X’Pert PRO X-ray diffractome...

Embodiment 2

[0070] The preparation of embodiment 2 Mg-Al-SBA-15 molecular sieve catalyst

[0071] (1) According to the molar ratio P123: Al 2 o 3 : SiO 2 :H 2 SO 4 :MgO:H 2O is calculated as 1:4.0:60.0:290:2.5:9000, weigh 20g of triblock polymer P123, mix with calculated amount of distilled water and sulfuric acid, stir and mix at 42°C for 1h, add calculated amount of monohydrate oxidation Aluminum and magnesium acetate, continue to stir and mix for 1 hour; then, slowly add the calculated amount of tetraethyl orthosilicate under stirring conditions, and continue to stir for 5 hours at 42°C; crystallize at 95°C for 48 hours, then filter and wash , drying, and finally in a muffle furnace at a heating rate of 1 °C / min from 20 °C to 550 °C, and constant temperature roasting for 5 hours to remove the template agent to obtain Mg-Al-SBA-15 molecular sieve powder, its Al 2 o 3 with SiO 2 The molar ratio is 0.0667, MgO and SiO 2 The molar ratio was 0.0417. Characterized by X-ray diffract...

Embodiment 3

[0073] Embodiment 3 Preparation of Ba-Al-SBA-15 molecular sieve catalyst

[0074] (1) According to the molar ratio P123: Al 2 o 3 : SiO 2 :HCl:BaO:H 2 O is calculated as 1:10.0:62.0:300:3.0:11000, weigh 20g of triblock polymer P123, mix with calculated amount of distilled water and hydrochloric acid, stir and mix at 40°C for 1h, add calculated amount of monohydrate oxidation Aluminum and barium nitrate, continue to stir and mix for 1 hour; then, slowly add the calculated amount of tetraethyl orthosilicate under stirring conditions, continue stirring at 40°C for 6 hours; crystallize at 100°C for 48 hours, then filter and wash , dried, and finally in a muffle furnace at a heating rate of 2°C / min from 20°C to 550°C, and roasted at a constant temperature for 5 hours to remove the template agent to obtain Ba-Al-SBA-15 molecular sieve powder, its Al 2 o 3 with SiO 2 The molar ratio is 0.1613, BaO and SiO 2 The molar ratio was 0.0484. Characterized by X-ray diffraction and tr...

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Abstract

The invention relates to a method for catalytically synthesizing long-chain alkyl aromatic hydrocarbons. The method comprises the following steps: inputting a raw material aromatic hydrocarbon into afixed bed alkylation reactor, and filling the reactor with the raw material aromatic hydrocarbon; inputting a mixture of the raw material aromatic hydrocarbon, raw material C6-C24 long-chain olefins and an additive long-chain alkyl aromatic hydrocarbon solvent or long-chain alkane solvent into the fixed bed reactor, contacting with an SBA-15 type mesoporous molecular sieve alkylation solid acid catalyst, and carrying out an alkylation reaction on the aromatic hydrocarbon and the long-chain olefin to generate a product long-chain alkyl aromatic hydrocarbon; taking one part of an alkylation reactor effluent as a circulating fluid circulating to the reactor, and taking the other part as an effluent fluid for separating excessive raw materials and products in a distillation separation system.The method disclosed by the invention has the characteristics of environmental friendliness, good catalyst activity stability, high conversion rate, high selectivity, high product linearity and low energy consumption.

Description

technical field [0001] The invention relates to a method for catalytically synthesizing long-chain alkyl aromatics, in particular to a method for synthesizing long-chain alkyl aromatics through the alkylation reaction of long-chain olefins and aromatic hydrocarbons using mesoporous molecular sieve solid acid catalysts. Background technique [0002] Long-chain alkylaromatics can be used as intermediates of detergents and surfactants for oil displacement, as well as synthetic lubricating oils, heat transfer oils, and can also be used to produce lubricating oil additives and corrosion inhibitors. They are important petrochemical raw materials and products. Processes such as liquid wax dehydrogenation, paraffin cracking, Fischer-Tropsch synthesis, and ethylene oligomerization can produce long-chain olefins, which can be combined with benzene, toluene, ethylbenzene, xylene, methylethylbenzene, propylbenzene, di Alkylation of aromatics such as ethylbenzene to produce long-chain a...

Claims

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Application Information

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IPC IPC(8): B01J29/04B01J23/30B01J27/16B01J27/10B01J27/188B01J23/44B01J23/62C07C2/70C07C2/66C07C2/68C07C15/107
CPCB01J29/041B01J29/045B01J23/30B01J23/002B01J27/16B01J27/10B01J27/188B01J23/44B01J23/626C07C2/70C07C2/66C07C2/68B01J2523/00C07C2529/04C07C2523/30C07C2527/16C07C2527/10C07C2527/188C07C2523/44C07C2523/62C07C15/107B01J2523/31B01J2523/48B01J2523/69Y02P20/584Y02P20/52
Inventor 任杰金辉
Owner ZHEJIANG UNIV OF TECH
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