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Alkylation method

An alkylation and catalyst technology, which is applied in the alkylation field, can solve the problems of low utilization rate of methanol alkylation, low xylene selectivity, low benzene conversion rate, etc., and achieves high benzene conversion rate and good activity stability. , the effect of improving activity and selectivity and service life

Active Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN102600887A reported the technical scheme of loading alkaline earth and rare earth metal elements on the hydrogen type MCM-22 molecular sieve, which solved the problem of low methanol alkylation utilization rate, low benzene conversion rate, and two Disadvantages of low toluene selectivity
However, there is no report in the existing literature on the application of IM-5 molecular sieves to the industrial production of the alkylation reaction between benzene and methanol

Method used

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Embodiment approach

[0026] According to a preferred embodiment of the present invention, preferably the mesoporous area of ​​the modified IM-5 molecular sieve is 151-250m 2 / g, the mesopore volume is 0.55-0.75cm 3 / g.

[0027] According to the present invention, preferably the total specific surface area of ​​the modified IM-5 molecular sieve is 350-500m 2 / g, the micropore area is 200-210m 2 / g, the micropore volume is 0.09-0.12cm 3 / g, the total pore volume is 0.65-0.85cm 3 / g.

[0028] As long as the molecular sieve of the present invention meets the foregoing requirements, the purpose of the present invention can be achieved, and there is no special requirement for its preparation method. For the present invention, the preferred molecular sieve is prepared as follows:

[0029] Under airtight conditions, contact the modifier solution with H-IM-5 molecular sieve, filter, wash, dry, and roast to obtain the modified IM-5 molecular sieve, wherein the modifier solution contains cation, and th...

preparation Embodiment 1

[0070] Prepare IM-5 modified molecular sieve by the method for comparative example 1, difference is that in step (2) with MPPBr 2 (1,5-bis(N-methylpyrrolidine) pentane bromide) and NaOH are formulated into a mixed aqueous solution at a molar ratio of 0.2:1 to replace the NaOH solution. In the mixed solution [OH -1 ] the molar concentration is 0.2mol / L, the reaction time is 2 hours, all the other conditions are the same, and the modified IM-5 molecular sieve Z 2 , the physical and chemical parameters are shown in Table 1.

preparation Embodiment 2

[0072] Prepare the IM-5 modified molecular sieve according to the method of comparative example 1, the difference is, use MPPBr in step (2) 2 (1,5-bis(N-methylpyrrolidine) pentane bromide) and NaOH are formulated into a mixed aqueous solution at a molar ratio of 0.3:1 to replace the NaOH solution, and [OH -1 ] the molar concentration is 0.2mol / L, the reaction time is 2 hours, all the other conditions are the same, and the modified IM-5 molecular sieve Z 3 , the physical and chemical parameters are shown in Table 1.

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Abstract

The invention specifically provides an alkylation method, belonging to the field of alkylation. The alkylation method comprises a step of allowing benzene to contact with methanol in the presence of a catalyst containing a modified IM-5 molecular sieve, wherein the modified IM-5 molecular sieve has a mesoporous area of 150 m<2> / g or above and a mesoporous volume of 0.5 cm<3> / g or above. The catalyst used in the invention has the advantages of slow inactivation rate, high catalytic activity and good selectivity; e.g., when the catalyst is used under a high space velocity condition, activity stability of the catalyst is still long, and the catalyst still has a high benzene conversion rate in a reaction at low temperature. Due to the advantages of the catalyst, the alkylation reaction of benzene with methanol has the advantages of high benzene conversion rate, good selectivity of target products, i.e., xylene and 1,2,4-trimethylbenzene, etc.; and since the catalyst is not prone to inactivation, the alkylation reaction has a long operation period and is especially suitable for industrial application.

Description

technical field [0001] The present invention relates to an alkylation process. Background technique [0002] The alkylation reaction of benzene and methanol is a reaction with high industrial application value. This method can synthesize toluene and xylene with high application value through one reaction, especially p-xylene, which is a very important industrial basic organic raw material. The raw materials of reaction, benzene and methanol, have wide sources and low prices. So far, there are few studies on the alkylation of benzene and methanol, but the research on this reaction has been started at home and abroad. [0003] Since the development of ZSM-5 zeolite by the US Mobile Company in the 1970s, it has been widely valued due to its excellent catalytic performance for reactions such as alkylation, isomerization, benzene ring methylation, and selective cracking. People have also focused on ZSM-5 molecular sieves as catalytic materials for benzyl alcohol and benzene cyc...

Claims

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Application Information

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IPC IPC(8): C07C15/02C07C15/08C07C2/88B01J29/70B01J35/10
CPCY02P20/52
Inventor 孙敏王永睿慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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