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Solid acid catalytic reaction method for aromatic hydrocarbon long-chain alkylation

A solid acid catalysis, alkylation reactor technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of poor stability of activity and difficult to evaluate solid Acid catalyst activity stability, difficult to achieve large-scale continuous production and other problems, to achieve the effects of high selectivity, good catalyst activity stability, and high product linearity

Active Publication Date: 2020-07-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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 solid acid catalysts for long-chain alkylation of aromatic hydrocarbons mainly have 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 solid acid catalysts for long-chain alkylation of aromatic hydrocarbons. Development Direction of Acid Catalyzed Reaction Technology

Method used

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  • Solid acid catalytic reaction method for aromatic hydrocarbon long-chain alkylation
  • Solid acid catalytic reaction method for aromatic hydrocarbon long-chain alkylation
  • Solid acid catalytic reaction method for aromatic hydrocarbon long-chain alkylation

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Effect test

Embodiment 1

[0063] The preparation of embodiment 1 Sr-Al-MCM-41 molecular sieve catalyst

[0064] (1) According to the molar ratio of raw materials SiO 2 :Al 2 o 3 :SrO:CTMAB:NaOH:H 2 O is calculated as 1:0.1:0.2:0.14:0.24:150.0, respectively weighing 35.7g of silica sol, 4.86g of monohydrate alumina, 7.55g of strontium nitrate, and 16.3g of cetyltrimethylammonium bromide (CTMAB) , 3.1g sodium hydroxide, 86.14g deionized water, mix them evenly to make a gel; crystallize at 140°C for 24 hours under autogenous pressure conditions; then filter, wash, and dry; then in a muffle furnace Program the temperature from 25°C to 550°C at a heating rate of 2°C / min, and roast at a constant temperature for 5 hours to remove the template agent to obtain sodium-type molecular sieves; finally, according to the solid-liquid mass ratio of 1:20, use nitric acid with a concentration of 1.0mol / L The sodium-type molecular sieve obtained was ion-exchanged at 80°C for 8 hours with an ammonium aqueous solution,...

Embodiment 2

[0066] The preparation of embodiment 2 Mg-Al-MCM-41 molecular sieve catalyst

[0067] (1) According to the molar ratio of raw materials SiO 2 :Al 2 o 3 :MgO:CTMAB:NaOH:H 2 O is 1: 0.2: 0.1: 0.14: 0.24: 150.0 calculation, take by weighing 35.7g silica sol, 9.72g monohydrate aluminum oxide, 4.57g hexahydrate magnesium nitrate, 16.3g cetyltrimethylammonium bromide ( CTMAB), 3.1g sodium hydroxide, and 86.14g deionized water were mixed uniformly to make a gel; crystallization reaction was carried out at 140°C and autogenous pressure for 24 hours; then filtered, washed with water, and dried; In the furnace, the temperature was programmed to rise from 25°C to 550°C at a heating rate of 2°C / min, and roasted at a constant temperature for 5 hours to remove the template agent to obtain sodium-type molecular sieves; finally, according to the solid-liquid mass ratio of 1:20, use a concentration of 1.0mol / L The ammonium nitrate aqueous solution was used to ion-exchange the obtained sodi...

Embodiment 3

[0069] Embodiment 3 Preparation of La-Mg-Al-MCM-41 molecular sieve catalyst

[0070] (1) According to the molar ratio of raw materials SiO 2 :Al 2 o 3 :MgO:La 2 o 3 :CTMAB:NaOH:H 2 O is calculated as 1:0.2:0.05:0.1:0.14:0.24:150.0, respectively weighing 35.7g silica sol, 2.43g monohydrate alumina, 2.29g hexahydrate magnesium nitrate, 27.8g lanthanum nitrate, 16.3g hexadecyl Trimethylammonium bromide (CTMAB), 3.1g sodium hydroxide, 86.14g deionized water, mix them evenly to make a gel; crystallize at 140°C for 24h under autogenous pressure conditions; then filter and wash with water , drying; then in a muffle furnace, the temperature was programmed from 25°C to 550°C at a heating rate of 2°C / min, and roasted at a constant temperature for 5 hours to remove the template agent to obtain a sodium molecular sieve; finally, according to the solid-liquid mass ratio of 1:20 , the obtained sodium molecular sieve was ion-exchanged at 80°C for 8 hours with an aqueous solution of amm...

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Abstract

The invention relates to a solid acid catalytic reaction method for aromatic hydrocarbon long-chain alkylation, which comprises the following steps: feeding raw material aromatic hydrocarbon into a fixed bed alkylation reactor to fill the reactor; feeding a mixture of the raw material aromatic hydrocarbon, the raw material C6-C24 long-chain olefin and an additive long-chain alkyl aromatic hydrocarbon solvent or long-chain alkane solvent into a fixed bed reactor, contacting with an MCM-41 type mesoporous molecular sieve solid acid catalyst, and carrying out an aromatic hydrocarbon long-chain alkylation reaction to generate product long-chain alkyl aromatic hydrocarbon; taking one part of the alkylation reactor effluent as a circulating fluid circulating to the reactor, and taking the otherpart as an effluent fluid for separating excessive raw materials and products in a distillation separation system. The method disclosed by the invention is environment-friendly, good in catalyst activity stability, high in conversion rate, high in selectivity and high in product linearity.

Description

technical field [0001] The invention relates to a solid acid catalyzed reaction method for the long-chain alkylation of aromatic hydrocarbons, in particular to a method for synthesizing long-chain alkyl aromatic hydrocarbons by using a mesoporous molecular sieve solid acid catalyst to carry out the alkylation reaction of long-chain olefins and aromatic hydrocarbons. Background technique [0002] Long-chain alkylaromatics are important petrochemical raw materials and products, which can be used as intermediates for detergents and surfactants for oil displacement, and can also be used as synthetic lubricating oils, heat transfer oils, and can also be used to produce lubricating oil additives, retarders, etc. etchant. The long-chain olefins produced by liquid wax dehydrogenation, paraffin cracking, Fischer-Tropsch synthesis, ethylene oligomerization and other processes are used as alkylation reagents, and benzene, toluene, ethylbenzene, xylene, methyl ethyl Long-chain alkylati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J29/04B01J27/18B01J27/125B01J27/188B01J23/30B01J27/16B01J31/18C07C2/66C07C15/107
CPCB01J29/0308B01J29/0341B01J29/041B01J29/045B01J37/0009B01J23/30B01J23/002B01J27/16B01J27/125B01J27/188C07C2/66B01J2229/18B01J2523/00B01J2523/31B01J2523/48B01J2523/69C07C15/107Y02P20/584Y02P20/52
Inventor 任杰刘冰邓优金辉
Owner ZHEJIANG UNIV OF TECH
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