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Process for preparing 4,4'-diaminodiphenyl ether by hydrogenation reduction method

A technology of diaminodiphenyl ether and reduction method, which is applied in the preparation of organic compounds, preparation of aminohydroxy compounds, chemical instruments and methods, etc., can solve the problems of cumbersome production process, environmental pollution, and high cost, and achieves reduction of production cost, The effect of meeting quality requirements, improving reaction rate and yield

Inactive Publication Date: 2013-01-02
万达集团股份有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The existing production process adopts iron powder reduction method, which has cumbersome production process, high cost and serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The product of 4,4'-diaminodiphenyl ether is off-white or white crystal powder. The product has excellent physical and chemical properties and can be dissolved in DMAC, (N.N-dimethylacetamide) DMF (N.N-dimethylformamide ) and other organic solvents, insoluble in water, slightly soluble in ethanol, soluble in dilute hydrochloric acid. The quality indicators of industrial products are: content ≥ 99.5%; melting point ≥ 186°C; moisture ≤ 0.05%; ash content ≤ 500PPM.

[0011] A hydrogenation-reduction process for preparing 4,4'-diaminodiphenyl ether comprises: a compounding process, a condensation process, a hydrogenation-reduction process, and a sublimation crystallization process.

[0012] 1. Ingredients process:

[0013] ① First, clarify the type and quantity of the materials to be prepared;

[0014] ② Check whether the weighing and measuring are accurate;

[0015] ③ Check whether all valves are closed and the operation of equipment in the batching process;

[0016] ④...

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Abstract

The invention provides a process for preparing 4,4'-diaminodiphenyl ether by a hydrogenation reduction method, which comprises a material preparation procedure, a condensation procedure, a hydrogenation reduction procedure, and a sublimation crystallization procedure, and has the advantages of environment pollution improvement, production cost reduction, reaction rate and yield improvement, metal ion content reduction, and the like.

Description

technical field [0001] The invention relates to a method for producing 4,4'-diaminodiphenyl ether. Background technique [0002] 4,4'-diaminodiphenyl ether, referred to as ODA, is a new type of special engineering plastic polyimide, polyetherimide, polyesterimide, polymaleimide, polyarylamide and other high temperature resistant resins. One of the important raw materials. It is also the raw material for the synthesis of 3,3',4,4'-tetraaminodiphenyl ether, which is the main monomer for preparing a series of aromatic heterocyclic heat-resistant polymer materials. It is also used as a raw material and crosslinking agent for synthetic polymers such as high-performance heat-resistant epoxy resins and polyurethanes. At the same time, it is also used to replace the carcinogenic benzidine to produce azo dyes, reactive dyes and spices and other fields. At present, diamines have been used as raw materials to develop direct dyes of different color levels such as scarlet, bright red,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C217/90C07C213/02
Inventor 尚吉永谢丰鸣赵志强周玉莹
Owner 万达集团股份有限公司
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