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Method for synthesizing 1,2-dimethylimidazole and used supported catalyst

A supported catalyst, dimethylimidazole technology, applied in the field of preparation of supported catalysts, can solve the problems of high energy consumption, high temperature, etc., achieve good selectivity, high selectivity, and reduce production costs

Inactive Publication Date: 2016-09-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the above-mentioned H-Y type zeolite catalyst and γ-Al 2 o 3 Similar to the supported catalyst, the catalyst also requires a higher temperature and consumes a lot of energy

Method used

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  • Method for synthesizing 1,2-dimethylimidazole and used supported catalyst
  • Method for synthesizing 1,2-dimethylimidazole and used supported catalyst
  • Method for synthesizing 1,2-dimethylimidazole and used supported catalyst

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Embodiment 1

[0044] One, be used for the preparation method of the loaded catalyst of 2-methylimidazole and methanol reaction synthetic 1,2-dimethylimidazole, carry out following steps successively:

[0045] 1), initial roasting: commercially available γ-Al 2 o 3 (Particle diameter is 2-3mm) calcined at 400-500°C for 2h, and then calcined at 600-650°C for 7h to obtain the calcined γ-Al 2 o 3 ; After detection: the γ-Al 2 o 3 The specific surface area is 210 ~ 230m 2 / g, the pore size is 15.7~16.5nm, and the particle diameter is basically unchanged;

[0046] 2), the roasted γ-Al obtained in step 1) 2 o 3 Immerse in a closed container containing distilled water for 72 hours, then measure the volume of water reduction, and calculate the γ-Al after roasting 2 o 3 The pore volume is 1.0mL / g;

[0047] 3), initial impregnation: 47.9g copper nitrate trihydrate, 115.2g nickel nitrate hexahydrate, 21.3g zinc nitrate hexahydrate and 20.8g chromium nitrate nonahydrate were dissolved in disti...

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Abstract

The invention discloses a supported catalyst. With sintered gamma-Al2O3 as a carrier, active components are supported on the carrier; and the active components comprise 5%-20% of copper, 10%-30% of nickel, 0.5%-5% of zinc and 0.5%-5% of chromium. The invention further discloses a method for synthesizing 1,2-dimethyl imidazole by employing the supported catalyst. The method comprises the following steps: dissolving raw material, namely 2-methylimidazole, into methyl alcohol to obtain a raw material liquid, wherein the molar ratio of the 2-methylimidazole to the methyl alcohol is 1 to (1.5-6); putting the raw material liquid into a raw material tank; sampling with a sampling pump at constant speed; carrying out N-methylation on the raw material liquid through the supported catalyst in the reactor, wherein the gaseous hourly space velocity of the raw material liquid is 0.1-0.3 h<-1>; and the temperature of the reactor is 200-270 DEG C; condensing and collecting through a condenser to obtain a reaction liquid; and carrying out distillation treatment to obtain the 1,2-dimethyl imidazole.

Description

technical field [0001] The invention relates to a preparation method and application of a loaded catalyst used for the reaction of 2-methylimidazole and methanol to synthesize 1,2-dimethylimidazole. Background technique [0002] 1,2-Dimethylimidazole, which has the molecular formula C 5 h 8 N 2 , its structural formula is as follows: [0003] [0004] The pure product of 1,2-dimethylimidazole is a white prismatic crystal, mainly used as a curing agent for epoxy resin and other resins, and also used as a pharmaceutical intermediate. [0005] At present, there are three main catalysts for the synthesis of 1,2-dimethylimidazole from 2-methylimidazole by reacting with methanol, which are H-Y type zeolite catalyst, γ-Al 2 o 3 Supported catalysts and SiO 2 -Al 2 o 3 or phosphoric acid catalyst. details as follows: [0006] 1), the literature (K.M.Gitis et al.Chemistry of Heterocyclic Compounds 30 (1994) 5) reported that using H-Y type zeolite as a catalyst to catalyze...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/86C07D233/58
Inventor 陈新志苏佳辉钱超
Owner ZHEJIANG UNIV
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