Preparation method of catalyst for synthesizing hexamethylenediamine intermediate 6-aminocapronitrile and synthesis method of 6-aminocapronitrile

An aminocapronitrile and intermediate technology, which is applied in the synthesis field of 6-aminocapronitrile, can solve the problems of low catalyst activity and selectivity, and achieve the effects of low cost, simple preparation method and excellent strength

Active Publication Date: 2020-09-18
JIANGSU YANGNONG CHEM GROUP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a kind of preparation method and the synthetic method of the catalyst of 6-aminocapronitrile for the synthesis of hexamethylenediamine intermediate 6-aminocapronitrile, to solve the problem of preparing 6-aminocapronitrile by the ammoniation of caprolactam in the prior art -Activity and low selectivity of the catalyst of aminocapronitrile

Method used

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  • Preparation method of catalyst for synthesizing hexamethylenediamine intermediate 6-aminocapronitrile and synthesis method of 6-aminocapronitrile
  • Preparation method of catalyst for synthesizing hexamethylenediamine intermediate 6-aminocapronitrile and synthesis method of 6-aminocapronitrile

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Embodiment 1

[0039] Put 150g of silicon dioxide powder into the kneader, add 30g of pseudoboehmite and 120g of water, and add 10g of nitric acid aqueous solution with a mass concentration of 65% and knead for 80min, after extrusion molding for 3 times, dry at 40°C for 20h; The dried sample was calcined at 800° C. for 4 hours to obtain a molded support with a diameter of 3 mm and a support strength of 60 N / cm.

[0040] Dissolve 20g of calcium phosphate in 80g of sulfuric acid solution with a mass concentration of 25% to form an acidic solution of modifier, then slowly add 100g of molded carrier to it, soak the solution for 60min at room temperature and put the solution in an oven at 70°C, absolute pressure Dry at 0.01 MPa for 5 hours; take out the catalyst and put it in a muffle furnace at 650°C for 5 hours to obtain a catalyst for the synthesis of hexamethylenediamine intermediate 6-aminocapronitrile, with a strength of 200 N / cm.

Embodiment 2

[0042] The difference between embodiment 2 and embodiment 1 is that

[0043] Add 1.5g of pseudo-boehmite to prepare a shaped support with a support strength of 20N / cm, and finally obtain a catalyst for the synthesis of hexamethylenediamine intermediate 6-aminocapronitrile with a strength of 75N / cm.

Embodiment 3

[0045] The difference between embodiment 3 and embodiment 1 is that

[0046] Add 150g of pseudo-boehmite to prepare a shaped support with a support strength of 70N / cm, and finally obtain a catalyst for the synthesis of hexamethylenediamine intermediate 6-aminocapronitrile with a strength of 230N / cm.

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Abstract

The invention provides a preparation method of a catalyst for synthesizing a hexamethylenediamine intermediate 6-aminocapronitrile and a synthesis method of the 6-aminocapronitrile. The preparation method comprises the following steps: S1, mixing a carrier, a binder, water and a peptizing agent to obtain a mixture; S2, molding the mixture to obtain a molded carrier; and S3, modifying the molded carrier in a modifier acidic solution to obtain the catalyst for synthesizing the hexamethylenediamine intermediate 6-aminocapronitrile, wherein the mass ratio of the modifier to the molded carrier is (0.1-1): 1, and the modifier is selected from one or more of calcium phosphate, magnesium phosphate, aluminum phosphate, calcium metaphosphate, magnesium metaphosphate, aluminum metaphosphate and aluminum phosphite. Therefore, the catalyst has better strength, activity and selectivity. The preparation method is simple, wide in raw material source and relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of 6-aminocapronitrile preparation, in particular to a method for preparing a catalyst for synthesizing hexamethylenediamine intermediate 6-aminocapronitrile and a method for synthesizing 6-aminocapronitrile. Background technique [0002] 6-Aminocapronitrile is the key raw material for the synthesis of hexamethylenediamine, which is obtained by the catalytic ammoniation of caprolactam. [0003] In the U.S. Patent Application Publication No. US2234566, copper is loaded onto a silica gel carrier as a dehydration catalyst, and 6-aminocapronitrile is synthesized under the conditions that the ammonia / caprolactam molar ratio is 6 and the reaction temperature is 360 ° C. The conversion rate of caprolactam The yield of 6-aminocapronitrile is only 25%, and there is a problem of low catalyst activity. [0004] In U.S. Patent Application Publication No. US3855267, aluminum phosphate is dissolved in hot water to form a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/182C07C253/00C07C255/24
CPCB01J27/182C07C253/00C07C255/24Y02P20/52
Inventor 王根林王刚丁克鸿徐林王铖殷剑虎聂庆超
Owner JIANGSU YANGNONG CHEM GROUP
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