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Method for preparing imidazole by continuous tubular gas phase catalytic reaction

A gas-phase catalytic reaction and tubular reactor technology, applied in the direction of organic chemistry, can solve the problems of low yield, multiple processes, long cycle, etc., achieve high purity and conversion rate, simple process flow, and reduce waste water.

Inactive Publication Date: 2016-07-13
江苏沿江化工资源开发研究院有限公司
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  • Application Information

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Problems solved by technology

In short, the preparation of imidazole by kettle liquid phase reaction requires many procedures, long cycle, low yield and high energy consumption.

Method used

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  • Method for preparing imidazole by continuous tubular gas phase catalytic reaction
  • Method for preparing imidazole by continuous tubular gas phase catalytic reaction
  • Method for preparing imidazole by continuous tubular gas phase catalytic reaction

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Embodiment Construction

[0015] Examples, see figure 1 : figure 1 Including ammonia water storage tank 1, filter 2, pressure stabilizing valve 3, mixed aldehyde storage tank 4, metering pump 5, mixer 6, preheater 7, preheater heating furnace 8, reactor 9, reactor heating furnace 10. Condenser 11, condenser 12, back pressure valve 13, gas-liquid separators 14 and 15, and φ3*3β molecular sieve 16. The reactor 9 and other equipment and pipelines are respectively provided with a shut-off valve V, a three-way conversion valve S, a temperature measuring instrument T1 and a pressure measuring instrument P1, etc. as required. In the raw material, when the mass ratio of mixed aldehyde / ammonia water is 1.3:1, in the mixed aldehyde, the mass ratio of formaldehyde / glyoxal is 0.59:1.0, and the ratio of catalyst filling amount to tube reactor tube volume is 0.46:1, The ratio of the effective length to the inner pipe diameter of the tubular reactor is 45:1, and the space velocity ratio is 1.3h -1 , control the re...

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Abstract

The method for preparing imidazole by continuous tubular gas-phase catalytic reaction uses ammonia water and mixed aldehydes as raw materials, and β-molecular sieves as catalysts: (1) The mass ratio of mixed aldehyde / ammonia water in the raw material is 1.3:1, and the mass ratio of formaldehyde / glyoxal is 0.59: 1.0, the ratio of the catalyst filling amount to the inner tube volume of the tubular reactor is 0.46:1, and the ratio of the length of the tubular reactor to the inner tube diameter is 45:1; (2) The space velocity ratio is 1.3h ‑1 When the ammonia water and the mixed aldehyde are heated and vaporized by the preheater, they enter the tubular reactor for catalytic reaction; (3) the bottom discharge of the tubular reactor is condensed by the condenser to obtain the imidazole mixed solution; (4) the trace unreacted in the tubular reactor Formaldehyde, etc. are circulated to the raw material preheater for circular reaction. In the invention, the amount of ammonia water is reduced by 39.0%, the amount of formaldehyde is reduced by 41.0%, the purity of imidazole can reach 91.7%, and the conversion rate can reach more than 94.0%. The technological process is simple, the purity and conversion rate of the imidazole are high, and the waste water is significantly reduced.

Description

technical field [0001] The invention relates to a gas-phase catalytic reaction method, in particular to a continuous tubular gas-phase catalytic reaction method for preparing imidazole. Background technique [0002] Imidazole is an important pharmaceutical, pesticide intermediate and chemical raw material, and is widely used as a curing agent for epoxy resin, pharmaceutical antifungal and pesticide insecticide. Imidazole can be used as a curing agent for epoxy resin, which can improve the mechanical properties of products such as bending, stretching, and compression, improve the electrical properties of insulation, and improve the chemical properties of chemical resistance. It is widely used in computers and electrical appliances; as an antirust agent for copper Used as a printed circuit board and integrated circuit; used as a pharmaceutical raw material for the manufacture of antifungal drugs, antifungal agents, hypoglycemia treatment drugs, artificial plasma, trichomoniasi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/58
CPCC07D233/58
Inventor 顾正桂任鹏程孙昊
Owner 江苏沿江化工资源开发研究院有限公司
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