Method for continuously preparing paraxylene in microchannel reactor

A micro-channel reactor, para-xylene technology, applied in chemical instruments and methods, condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons, molecular sieve catalysts, etc., can solve the problems of high design requirements, complex processes, large energy consumption, etc. Achieve the effects of low cost, low reaction temperature and high conversion rate of reactants

Active Publication Date: 2015-08-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for continuously preparing p-xylene in a microchannel reactor, so as to solve the problems in the prior art, such as high requirements for reactor design, complex process, and large energy consumption.

Method used

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  • Method for continuously preparing paraxylene in microchannel reactor
  • Method for continuously preparing paraxylene in microchannel reactor
  • Method for continuously preparing paraxylene in microchannel reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 0.6g of copper nitrate and dissolve it in 20g of deionized water, stir at room temperature for 10min to mix evenly, add 8g of HZSM-5 molecular sieve with a silicon-aluminum ratio of 60 purchased from Nankai University Catalyst Factory, and impregnate at room temperature for 8h. The impregnated mixture was evaporated to dryness in an oil bath at 90°C, and the obtained solid was first dried in an oven at 120°C overnight, then calcined in a muffle furnace at 550°C for 6 hours, and cooled naturally to obtain the modified catalyst A.

Embodiment 2

[0038] Weigh 0.6g of copper nitrate and dissolve it in 20g of deionized water, stir at room temperature for 10min to mix evenly, add 8g of HZSM-5 molecular sieve with a silicon-aluminum ratio of 80 purchased from Nankai University Catalyst Factory, and impregnate at room temperature for 8h. The impregnated mixed solution was evaporated to dryness in an oil bath at 90°C, and the obtained solid was first dried in an oven at 120°C overnight, then roasted in a muffle furnace at 550°C for 6 hours, and cooled naturally to obtain the modified catalyst B.

Embodiment 3

[0040] Weigh 0.6g of copper nitrate and dissolve it in 20g of deionized water, stir at room temperature for 10min to mix evenly, add 8g of HZSM-5 molecular sieve with a silicon-aluminum ratio of 100 purchased from Nankai University Catalyst Factory, and impregnate at room temperature for 8h. The impregnated mixture was evaporated to dryness in an oil bath at 90°C, and the obtained solid was first dried in an oven at 120°C overnight, then calcined in a muffle furnace at 550°C for 6 hours, and cooled naturally to obtain modified catalyst C.

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Abstract

The invention discloses a method for continuously preparing paraxylene in a microchannel reactor, which comprises the following steps: under the action of a carrier gas N2, reacting bromomethane and toluene in the microchannel reactor to prepare paraxylene, and recycling the excess hydrogen bromide by using metal oxide. Compared with the prior art, the method uses the bromomethane as the methylation reagent, thereby being beneficial to high-efficiency utilization of the natural gas source. The method has the advantages of low coking and inactivation tendency of the catalyst, lower reaction temperature, higher reactant conversion rate, favorable selectivity for the target product and the like. Meanwhile, the method is simple to operate, has the characteristics of low cost and low environmental pollution, can implement continuous uninterrupted production, and has favorable industrial application prospects.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a method for continuously preparing p-xylene in a microchannel reactor. Background technique [0002] Para-xylene (PX) is an important organic chemical raw material, which is mainly used to produce terephthalic acid, and then produce polyester resins such as ethylene terephthalate and butanediol ester. Due to the large-scale development of my country's polyester and PTA industrial chains, there is a huge demand for raw material PX. However, most of the current technical processes for the industrial production of p-xylene were developed in the 1980s and 1990s. These technologies mainly include: [0003] (1) Xylene adsorption separation isomerization, the mixed xylenes generated from the catalytic reforming of naphtha are separated by multi-stage cryogenic crystallization or molecular sieve simulated moving bed adsorption separation, and p-xylene is separated from th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C2/88B01J29/46B01J29/44B01J29/035
CPCY02P20/52
Inventor 郭凯万力张锴欧阳平凯
Owner NANJING UNIV OF TECH
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