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Preparation of hexanediamine by hydrogenation of hexane dinitrile

A technology for producing hexamethylenediamine and adiponitrile, applied in chemical instruments and methods, preparation of amino compounds, preparation of organic compounds, etc., can solve problems such as inconvenient operation, large amount of catalyst used, low catalyst activity and selectivity, and achieve Continuous and simple process, low catalyst consumption and good hydrogenation effect

Inactive Publication Date: 2004-02-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low activity and selectivity of the catalyst, the reactor efficiency is also low, the amount of catalyst is large, the subsequent separation process is complicated, the process is cumbersome, and the operation is inconvenient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This example illustrates the preparation of a catalyst useful in the present invention.

[0020] Add 48 grams of nickel, 48 grams of aluminum, 1.5 grams of iron, and 2.5 grams of chromium into the quartz tube, heat it in a high-frequency furnace to above 1300 ° C to melt, and alloy it, and then use inert gas to remove the alloy liquid from The nozzle under the quartz tube is sprayed onto a copper roller with a rotating speed of 800 rpm. Cooling water is passed through the copper roller. After rapid cooling, the alloy liquid is thrown out along the tangent of the copper roller to form scale-like strips. After grinding to a particle diameter of less than 70 microns, a master alloy is obtained. The master alloy is heat-treated in a hydrogen environment, the temperature of the heat treatment is 600° C., and the constant temperature time is 3 hours. The heat-treated master alloy was slowly added into a three-neck flask filled with 500 g of 20% sodium hydroxide aqueous solut...

Embodiment 2

[0022] This example illustrates the preparation of a catalyst useful in the present invention.

[0023] Add 44 grams of nickel, 52 grams of aluminum, 2.5 grams of iron, and 1.5 grams of chromium into the quartz tube, heat it in a high-frequency furnace to above 1300 ° C to melt, and alloy it, and then use inert gas to remove the alloy liquid from The nozzle under the quartz tube is sprayed onto a copper roller with a rotating speed of 800 rpm. Cooling water is passed through the copper roller. After rapid cooling, the alloy liquid is thrown out along the tangent of the copper roller to form scale-like strips. After grinding to a particle diameter of less than 70 microns, a master alloy is obtained. The master alloy is heat treated in a hydrogen atmosphere, the heat treatment temperature is 700° C., and the constant temperature time is 2 hours. The heat-treated master alloy was slowly added into a three-neck flask filled with 1000 g of 20% sodium hydroxide aqueous solution, an...

Embodiment 3

[0025] This example illustrates the preparation of a catalyst useful in the present invention.

[0026] Add 48 grams of nickel, 48 grams of aluminum, 2.5 grams of iron, and 1.5 grams of molybdenum into the quartz tube, heat it in a high-frequency furnace to above 1300 ° C to melt, make it alloyed, and then use inert gas to remove the alloy liquid from The nozzle under the quartz tube is sprayed onto a copper roller with a rotating speed of 800 rpm. Cooling water is passed through the copper roller. After rapid cooling, the alloy liquid is thrown out along the tangent of the copper roller to form scale-like strips. After grinding to a particle diameter of less than 70 microns, a master alloy is obtained. The master alloy is heat treated in a hydrogen atmosphere, the heat treatment temperature is 700° C., and the constant temperature time is 2 hours. The heat-treated master alloy was slowly added into a three-neck flask filled with 1000 g of 20% sodium hydroxide aqueous solutio...

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PUM

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Abstract

A process for preparing hexanediamine by hydrogenating hexanedinitrile includes such steps as preparing the solution of hexanedinitrile in alcohol, and making the solution in contact with H2 under existance of catalyst in magnetically stabilized-bed reactor. Said catalyst may be the non-crystal alloy catalyst containing Ni as main active component. Its advantages are high hydrogenating effect, low consumption of catalyst, and simple process.

Description

technical field [0001] The invention relates to a method for preparing hexamethylenediamine by hydrogenating adiponitrile. Background technique [0002] Hexamethylenediamine is a monomer for the production of nylon-66. The existing processes all use Raney Ni catalysts and are carried out in tank reactors or fluidized bed reactors. Due to the low activity and selectivity of the catalyst, the efficiency of the reactor is also low, the amount of the catalyst is large, the subsequent separation process is complicated, the process is cumbersome, and the operation is inconvenient. [0003] USP5900511 proposes a method for continuous hydrogenation of adiponitrile, in which Ni and Cr modified Raney Co catalysts and tank reactors are used to hydrogenate adiponitrile at 70-100°C and 1.72-6.89MPa Change into aminocapronitrile or hexamethylenediamine. [0004] USP4064172 proposes a method for the hydrogenation of adiponitrile, which uses an iron oxide catalyst and a fixed-bed reactor,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/48C07C211/12
Inventor 慕旭宏陈勇男王宣宗保宁闵恩泽
Owner CHINA PETROLEUM & CHEM CORP
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