A method for continuously preparing p-xylene in a microchannel reactor

A microchannel reactor and p-xylene technology, which is applied in chemical instruments and methods, condensation between hydrocarbons and non-hydrocarbons, bulk chemical production, etc., can solve the problems of high energy consumption, high design requirements, complex processes, etc. problem, achieve the effect of low reaction temperature, low cost and simple operation

Active Publication Date: 2017-09-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A method for continuously preparing p-xylene in a microchannel reactor
  • A method for continuously preparing p-xylene in a microchannel reactor
  • A method for continuously preparing p-xylene in a microchannel reactor

Examples

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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 p-xylene in a microchannel reactor. Under the action of carrier gas N2, p-xylene is prepared by reacting methyl bromide and toluene in a microchannel reactor, and the excess is recovered through metal oxides. hydrogen bromide. Compared with the prior art, the present invention uses methyl bromide as a methylation reagent, which is beneficial to the efficient utilization of natural gas resources. The method of the invention has the advantages that the catalyst is not easily coked and deactivated, the reaction temperature is low, the conversion rate of the reactant is high, the selectivity of the target product is good, and the like. Simultaneously, the method of the invention has the advantages of simple operation, low cost, little environmental pollution, continuous and uninterrupted production, and good industrial application prospect.

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 Patents(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 TECH UNIV
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