Application of nano molecular sieve catalyst in alkylation reaction of arene

A nano-molecular sieve, aromatic alkylation technology, applied in molecular sieve catalysts, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of less research on catalyst stability, equipment corrosion, poor reaction stability, etc., and achieve good reaction. The effect of stability, high selectivity and high conversion rate

Active Publication Date: 2007-10-17
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US 4547604 has reported the alkylation reaction of Lewis acids such as boron trifluoride, phosphorus pentafluoride, arsenic pentafluoride, antimony pentafluoride, tantalum pentafluoride, niobium pentafluoride as catalysts, but the catalyst used is toxic and corrosive Strong, complex separation of products
JP 8-325175, JP 2004-160354, US 4347393 and US 4049740 have reported the method for preparing m-dicumyl by alkylation of benzene and propylene on liquid aluminum trichloride complex, and the preparation of complex catalyst used in this process is complicated , the reaction requires multiple reactors connected in series, and the use of aluminum trichloride is likely to cause environmental pollution and equipment corrosion
The application of molecular sieves in the alkylation reaction is a focus of attention of researchers, and there are many patent reports: such as JP 2002-20325 (mordenite), US 3251897 (X and Y zeolites), US 3751504 (ZSM-5), JP 2000 -309546, JP 03-181424 a

Method used

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  • Application of nano molecular sieve catalyst in alkylation reaction of arene
  • Application of nano molecular sieve catalyst in alkylation reaction of arene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] MCM-56 raw powder with a silicon-aluminum ratio of 50 was reflux-exchanged with 1mol / L ammonium nitrate solution for 3 times at 85°C, 6h each time. The filter cake was dried at 120° C., calcined at 540° C. for 3 hours, and then shaped to obtain a hydrogen-type molecular sieve catalyst.

[0016] Load the HMCM-56 catalyst into the fixed-bed continuous flow reaction device, and use the pump to continuously send the raw materials cumene and propylene into the reactor respectively. The reaction temperature is 190°C, the reaction pressure is 2.8MPa, and the cumene / propylene molar ratio is 3. , Propylene liquid hourly space velocity 1.0h -1 , the reaction results are shown in Table 1.

[0017] Reaction time

Embodiment 2～4

[0019] The same method as in Example 1 is used to process the original powder of nano molecular sieve MCM-22 and MCM-49, the MCM-22 silicon-aluminum ratio is 40 and 50 respectively, and the MCM-49 silicon-aluminum ratio is 25, and the hydrogen-type nano-molecular sieve is used as a catalyst. Alkylation reaction, the reaction conditions are the same as in Example 1, and the reaction results are shown in Table 2.

[0020]

Embodiment 5～8

[0022] Catalyst and reaction condition are the same as embodiment 4, and reaction temperature is different, and reaction result is as table 3.

[0023]

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Abstract

The invention provides an application of nanometer molecular screen in aromatic hydrocarbons alkylation reaction, and a method for generating mono-substituted, disubstituted and polysubstituted benzene by alkylation reaction of aromatic hydrocarbons with olefin hydrocarbon or alcohol on molecular sieve catalyst, wherein aromatic hydrocarbons is benzene, toluol, ethylbenzene or cumene; olefin hydrocarbon is ethylene, propone, butene or isobutene; alcohol is C1 to C4 aliphatic alcohol; molecular screen is high high crystallinity sheet MCM-22, MCM-49 or MCM-56 crystal powder in which the thickness is smaller than 50nm, and sizes is between 300 and 500nm.The nanometer molecular sieve catalyst provided in present invention has high conversion rate of alkylation reaction and high selectivity, and it has fine stability, which is capable of being used for manufacturing production.

Description

technical field [0001] The invention relates to the application of nanometer molecular sieves in the alkylation reaction of aromatic hydrocarbons, and the reaction process of alkylating aromatic hydrocarbons with olefins or alcohols on nanometer molecular sieve catalysts to generate monosubstituted or disubstituted or multisubstituted benzenes. Background technique [0002] Mono-substituted, di-substituted and multi-substituted benzene compounds are important organic chemical raw materials, widely used in synthetic resins, dyes, preservatives, medicine, organic synthesis and other fields, such as toluene, ethylbenzene, cumene, tert-butyl Benzene, m / p-methylcumene, p-diethylbenzene, m / p-dicumene, 3,5-dimethylcumene, etc. [0003] Alkylation of aromatics with olefins or alcohols is a common method for the preparation of substituted benzenes, and commonly used catalysts include fluorides, liquid aluminum trichloride complexes and molecular sieves. US 4547604 has reported the a...

Claims

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Application Information

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IPC IPC(8): C07C2/66C07C2/86C07C15/02B01J29/70
Inventor 李雪梅秦春华陈超张春雷邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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