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Continuous preparation method of 4,4'-diaminodicyclohexylmethane

A technology of diaminodicyclohexylmethane and diphenylmethane, which is applied in the field of continuous production of 4,4′-diaminodicyclohexylmethane, which can solve the problems of few equipment and process research reports, and shorten the diffusion distance , the gas-liquid mixing time is reduced, and the effect of inhibiting the formation of by-products of deaminated heavy components

Active Publication Date: 2021-05-28
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009]In addition, most of the published documents or patents are foreign documents, and they mainly involve the development and improvement of catalysts, and the corresponding research reports on equipment and processes not much

Method used

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  • Continuous preparation method of 4,4'-diaminodicyclohexylmethane
  • Continuous preparation method of 4,4'-diaminodicyclohexylmethane
  • Continuous preparation method of 4,4'-diaminodicyclohexylmethane

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Embodiment Construction

[0035] The process and the specific operation of the device are described in detail below:

[0036] (1) Loaded bimetallic catalyst is loaded in the jet hydrogenation filter tower, wherein the ratio of metal rhodium and ruthenium loading is 1:1~50:1, and loaded loaded bimetallic catalyst is loaded in the Y-type microchannel reactor, wherein The ratio of metal rhodium to ruthenium loading is 1:1 to 50:1. After filling, check the air tightness of the system.

[0037] (2) After passing the air tightness inspection, heat the MDA in the raw material kettle 1 to 98°C-102°C, and flow it into the preheater 3 through the circulation pump. After the material is heated, it enters the jet loop reactor, during which the control valve 11-1 is opened. ~ 11-3, 11-5, 11-7, adjust 12 three-way valves to flow from the circulation pump to the heater, and carry out the hydrogenation reaction. After the online chromatogram 5-1 detects that the product index is qualified (H 6 MDA content is 90%~100%...

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Abstract

The invention relates to a continuous preparation method of 4,4'-diaminodicyclohexylmethane (HMDA). The preparation method comprises the following steps: carrying out MDA hydrogenation reaction in a jet loop reactor and a Y-type microchannel reactor in a molten MDA state without using a solvent by using loaded bimetallic ruthenium rhodium as a catalyst to obtain an HMDA product. According to the technology, the MDA hydrogenation conversion rate can reach 100%, the HMDA yield exceeds 98%, continuous production can be achieved, the technological process is simple, and monitoring and control are convenient.

Description

technical field [0001] The present invention relates to a preparation method of 4,4'-diaminodicyclohexylmethane (HMDA), specifically using 4,4-diaminodiphenylmethane (MDA) as raw material for continuous production of 4,4' - The diaminodicyclohexylmethane (HMDA) method. Background technique [0002] HMDA is mainly produced by high-pressure catalytic hydrogenation of MDA. On the one hand, HMDA can be used to react with sebacic acid or adipic acid to produce nylon. On the other hand, HMDA is the raw material for preparing a new generation of anti-aging polyurethane with superior performance - 4,4'-dicyclohexylmethane diisocyanate. This type of isocyanate is suitable for preparing polyurethane coatings and paints with light weight and stable performance, and its application fields involve electromechanical, shipbuilding, civil engineering and textiles, etc. In recent years, its demand in domestic and foreign markets has increased year by year. [0003] As early as the 1950s, ...

Claims

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Application Information

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IPC IPC(8): C07C209/72C07C211/36
CPCC07C209/72C07C2601/14C07C211/36
Inventor 智丁未倪自林李鑫张聪颖姜庆梅李显赫黎源丁皓
Owner WANHUA CHEM GRP CO LTD