A kind of method for preparing hexamethylenediamine intermediate 6-aminocapronitrile by fractional gas phase method

A technology of aminocapronitrile and gas phase method, which is applied in the field of preparing hexamethylenediamine intermediate 6-aminocapronitrile by graded gas phase method, and can solve the problems of high selectivity of 6-aminocapronitrile, high conversion rate of caprolactam, and low molar ratio of caprolactam, etc. problem, to achieve high 6-aminocapronitrile selectivity, high conversion rate of caprolactam, and prolong catalyst life

Active Publication Date: 2022-03-11
JIANGSU YANGNONG CHEM GROUP
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of the technologies described above, the invention provides a method for preparing 6-aminocapronitrile by a fractional gas phase method, especially a method for preparing hexamethylenediamine intermediate 6-aminocapronitrile by a fractional gas phase method. Ammonia exists in the process of preparing 6-aminocapronitrile by gas-phase method: the low caprolactam mol ratio, the high conversion rate of caprolactam and the high selectivity of 6-aminocapronitrile are difficult to balance the three problems, which improves the industrialization preparation of 6-aminocapronitrile Economic benefits, broad application prospects

Method used

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  • A kind of method for preparing hexamethylenediamine intermediate 6-aminocapronitrile by fractional gas phase method
  • A kind of method for preparing hexamethylenediamine intermediate 6-aminocapronitrile by fractional gas phase method

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Embodiment 1

[0062] The present embodiment provides a method for preparing 6-aminocapronitrile by fractional gas-phase method, said method comprising the steps of:

[0063] (1) Ammonia and the first part of caprolactam are mixed and vaporized, and then passed into the first fixed-bed reactor (a total of 4 fixed-bed reactors connected in series, counted as 4 fixed-bed reactors, each fixed-bed reactor The catalyst of the same weight is loaded inside), and the reaction is carried out under the action of the first reaction temperature, the first reaction pressure and the first catalyst, to obtain the first reaction discharge;

[0064] (2) The i-th reaction output and the i+1 part of caprolactam are passed into the i+1 section fixed-bed reactor, and the value range of i is 1≤i≤3 and i is a natural number; the i+1th reaction temperature , the i+1th reaction pressure and the i+1th catalyst are reacted to obtain the i+1th reaction discharge;

[0065] Wherein, the i+1 reaction discharging material...

Embodiment 2

[0070] The difference between this example and Example 1 is that the number of fixed bed reactors is 2, the first reaction temperature and the second reaction temperature are 350°C and 375°C respectively, and the first reaction pressure and the second reaction pressure are 0 MPa and 0.3MPa, the molar ratios of silicon, aluminum and phosphorus in the first catalyst and the second catalyst are 1:0.8:0.2 and 1:0.8:0.6, and all the others are the same as in Example 1.

Embodiment 3

[0072] The difference between this example and Example 1 is that the number of fixed bed reactors is 5, the first reaction temperature to the fifth reaction temperature are 350°C, 375°C, 400°C, 425°C and 450°C respectively, and the first The reaction pressure to the 5th reaction pressure is 0MPa, 0.3MPa, 0.6MPa, 0.9MPa and 1.2MPa respectively, and the molar ratio of silicon, aluminum and phosphorus in the first catalyst to the fifth catalyst is 1:0.8:0.2, 1: 0.8:0.3, 1:0.8:0.45, 1:0.8:0.68 and 1:0.8:1.01, and the rest are the same as in Example 1.

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Abstract

The invention provides a method for preparing hexamethylenediamine intermediate 6-aminocapronitrile by a fractional gas-phase method. The method remarkably improves the molar ratio of the active component to the carrier element in the catalyst and the temperature and pressure of the reaction through multi-stage adjustment. The conversion rate of caprolactam, the selectivity of 6-aminocapronitrile and the utilization rate of ammonia gas reduce the circulation amount of ammonia gas and facilitate the realization of industrial production.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a method for preparing hexamethylenediamine intermediate 6-aminocapronitrile by a fractional gas phase method. Background technique [0002] 6-Aminocapronitrile is an important chemical intermediate, which can be used in pesticide, pharmaceutical and other industries, and can also be hydrogenated to prepare 1,6-hexanediamine. Hexamethylenediamine is mainly used to produce polyamides, such as polycondensation with adipic acid to prepare nylon 66, and polycondensation with sebacic acid to prepare nylon 610, and then to make various engineering plastics. Hexamethylenediamine can also be used to synthesize polyurethane and isocyanate, and as Curing agent for epoxy resin, organic crosslinking agent, etc. [0003] Both 6-aminocapronitrile and hexamethylenediamine can be produced by hydrogenation of adiponitrile, but at present, adiponitrile basically relies on imports, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/00C07C253/20C07C255/04
CPCC07C253/00C07C253/20C07C255/04
Inventor 王根林王铖李良善丁克鸿徐林刘鑫梅学赓陈耀坤王鑫宇何成义郭博博邢志远
Owner JIANGSU YANGNONG CHEM GROUP
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