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Method for preparing hexamethylene diamine by starchy material

A starchy raw material, hexamethylenediamine technology, applied in the preparation of amino compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of restricting the development of nylon industry, highly toxic cyanation reaction, high technical difficulty, and achieving cost Low, mild reaction conditions, unique effect of process conditions

Inactive Publication Date: 2010-01-20
郸城财鑫糖业有限责任公司
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Problems solved by technology

Due to the high difficulty in the preparation of adiponitrile, the highly toxic cyanidation reaction, and poor safety, its technology is mainly controlled by the two major companies DuPont of the United States and BASF of Germany, and it is still blank in China. In recent years, with the rise of oil prices, the global diacetyl The supply of adiponitrile is tight, the price of imported adiponitrile is not only rising, and the quantity is also restricted, which seriously restricts the development of my country's nylon industry

Method used

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specific Embodiment

[0014] Specific embodiment: a kind of method for preparing hexamethylenediamine by starch raw material, is prepared by following steps:

[0015] (1) Preparation of sorbitol from starch::

[0016] Adopt domestic advanced preparation technology, starch liquefaction, saccharification to produce glucose, glucose is produced by hydrogenation reaction under the catalysis of Raney nickel, the reaction pressure is 8-10Mpa, the temperature is 140-145℃.

[0017] (2) Sorbitol pretreatment:

[0018] Sorbitol is mixed with water and sodium hydroxide for adjusting pH in a certain proportion: in order to achieve a better cracking effect, the weight ratio of mixed sorbitol in the water phase is about 30-50%. The ratio is 45%, the pH of the mixed solution is controlled at 11-13, the best is 11.8;

[0019] (2) Heating:

[0020] Heat the treated raw material to 170-210°C for the next cracking reaction;

[0021] (3) cracking reaction:

[0022] The substrate concentration of the sorbitol mixt...

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Abstract

The invention discloses a method for preparing hexamethylene diamine by utilizing starchy material, particularly taking common corn starch as raw material to prepare glucose through saccharification, and preparing sorbitol through the hydrogenation of glucose; through high-pressure hydrogenation, the sorbitol is cracked, rectified and separated to obtain 1,6-hexanediol, and finally by amination and dehydration the hexamethylene diamine is obtained. The invention has the advantages of low raw material cost, novel preparation route, unique technical conditions, more moderate reaction condition compared with other cracking process, and easy control. Compared with traditional petrochemical method, the petrochemical product--hexamethylene diamine which is prepared by adopting starchy material in the biochemical engineering process is able to reduce cost, decrease pollution, regenerate raw material and save huge amounts of oil resources.

Description

technical field [0001] The invention relates to a method for preparing hexamethylenediamine from starchy raw materials, in particular, sorbitol is prepared from ordinary cornstarch as a raw material, and then 1,6-hexanediol is prepared by high-temperature and high-pressure hydrogenation cracking, and finally obtained by amination and dehydration. Hexamethylenediamine. Background technique [0002] Hexamethylenediamine is an important chemical raw material, used as raw material of nylon 66, polyurethane foam and epoxy resin curing agent, and can also be used to prepare transparent nylon resin, synthesize polyimide carboxylic acid foam, hexamethylene isohydrogen acid Ester foams, coatings, adhesives, rubber additives, stabilizers in the textile and paper industry, etc., are important intermediates for synthetic materials. [0003] At present, hexamethylenediamine is mainly prepared by catalytic addition of 1,3-butadiene and hydrogen cyanide to form adiponitrile in the world, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/36C07C209/16B01J25/02B01J23/46
Inventor 仵树仁李霄峰叶新友李锦王念详陆启明朱瑞青闫锁王金恒
Owner 郸城财鑫糖业有限责任公司
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