Catalyst for preparing cyclohexanediamine by phenylenediamine hydrogenation under ammonia reaction conditions

A phenylenediamine and catalyst technology, applied in the field of catalysts, can solve the problems of catalyst deactivation, difficulty, low yield of target products, etc.

Inactive Publication Date: 2012-09-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent Nos. 3,450,759 and 5,973,207 found that hydrogenation of toluenediamine to the corresponding methylcyclohexanediamine is very difficult, and the yield of the target product is low, especially m-toluenediamine, which can be improved only after m-toluenediamine is separated. Yield of target product
Because in the hydrogenation process of o-phenylenediamine and p-phenylenediamine, on the one hand, it is e

Method used

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  • Catalyst for preparing cyclohexanediamine by phenylenediamine hydrogenation under ammonia reaction conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The catalyst of Example 1 was 5% Ru / coir charcoal. Weigh 9.5 grams of coconut shell charcoal (150-200 mesh), soak and boil in 3% nitric acid for 4 hours before use, wash with distilled water until pH=7.0, dry at 120°C for 6 hours, and configure 15ml containing 1.2935 grams of RuCl 3 .3H 2 O aqueous solution, use this aqueous solution to impregnate the above-mentioned coconut shell charcoal carrier, dry naturally, and dry in an oven at 120 ° C for 4 hours.

Embodiment 2

[0024] Catalyst 5%Ru / Al of embodiment 2 2 o 3 . In addition to weighing 9.5 grams of Al 2 o 3 Except, all the other preparation steps are the same as in Example 1.

Embodiment 3

[0026] Catalyst 5%Ru / SiO of Example 3 2 . In addition to weighing 9.5 g of SiO 2 Except, the rest of the preparation steps are the same as in Example 2.

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PUM

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Abstract

The invention discloses a catalyst for preparing cyclohexanediamine by phenylenediamine hydrogenation under ammonia reaction conditions. The catalyst realizes the transformation of phenylenediamine and hydrogen into cyclohexanediamine under ammonia reaction conditions and comprises a main active component, one or more auxiliary agents and a carrier. The main active component is a precious metal Ru or Pd. The one or more auxiliary agents are selected from Re, Co, Ni, Fe and their oxides. The carrier is active carbon, Al2O3 or SiO2. In a slurry-bed reactor, at a certain temperature, under the action of ammonia and catalyst, the high activity and high selectivity transformation of phenylenediamine and hydrogen into a plurality of amine products comprising cyclohexanediamine as a main product is realized.

Description

technical field [0001] The present invention relates to a catalyst for preparing cyclohexanediamine by hydrogenation of phenylenediamine under the condition of ammonia, and relates in detail to a catalyst for p-phenylenediamine, m-phenylenediamine or o-phenylenediamine and hydrogen under the condition of ammonia. Catalyst for converting 1,4-cyclohexanediamine, 1,3-cyclohexanediamine or 1,2-cyclohexanediamine under ammonia conditions. technical background [0002] Cyclohexanediamine is an important curing agent for epoxy resins, among which 1,2-cyclohexanediamine, 1,4-cyclohexanediamine and 1,3-cyclohexanediamine are the most widely used. It is a colorless transparent liquid and a white solid-liquid mixture. It is widely used in the fields of textile, paper, artificial leather and plastics. It can be used as raw materials for dyes, pharmaceutical intermediates, carbamates and polyamide resins. [0003] Industrially, 1,2-cyclohexanediamine, as a by-product of the production ...

Claims

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Application Information

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IPC IPC(8): B01J23/656B01J23/89B01J35/10B01J37/18B01J37/08C07C211/36C07C209/72
Inventor 丁云杰王涛吕元马立新
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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