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Method for preparing 6-aminocapronitrile

A technology of aminocapronitrile and ammonia gas is applied in the field of preparation of 6-aminocapronitrile, which can solve the problems of many by-product impurities, high reaction temperature, low efficiency and the like, and achieves high selectivity, simple preparation process and uniform heating. Effect

Pending Publication Date: 2021-09-17
BEIJING RISUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a continuous reaction process and device for preparing the key intermediate 6-aminocapronitrile of hexamethylenediamine by a caprolactam liquid phase method, and solves the low efficiency caused by the batch reaction of 6-aminocapronitrile prepared by the current liquid phase method , many by-product impurities, and a series of problems such as high reaction temperature and high energy consumption in the gas phase method

Method used

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  • Method for preparing 6-aminocapronitrile
  • Method for preparing 6-aminocapronitrile
  • Method for preparing 6-aminocapronitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The caprolactam is preheated to 80°C in the preheater 8, and the caprolactam is in a liquid state, and 0.002% by mass of phosphoric acid (based on the quality of the caprolactam) is added therein as a catalyst, fully mixed with the liquid caprolactam, and then passed through the first temperature-controlled metering pump 10 into the main reactor 1, the temperature of the first temperature-controlled metering pump is set at 70-140°C, the temperature of the main reactor is controlled at 250°C; the ammonia gas preheating temperature is 250°C, and the ammonia gas flow meter 7 is passed into the upper end of the main reactor 1 Inlet, followed by bubbling at the bottom of the reactor to fully contact with caprolactam and catalyst, the temperature of tube-and-tube reaction zone 2 is controlled at 300°C, and the molar ratio of ammonia gas to caprolactam is 40:1.

[0052] The reaction product and excess ammonia gas overflow from the outlet at the upper end of the main reactor 1 a...

Embodiment 2

[0058] The caprolactam is preheated to 80 ℃ in the preheater 8, and the caprolactam is in a liquid state, and a mass ratio of 0.01% phosphoric acid (based on the quality of the caprolactam) is added therein as a catalyst, fully mixed with the liquid caprolactam, and then passed through the first temperature-controlled metering pump 10 into the main reactor, the first temperature-controlled metering pump is set at a temperature of 70-140°C, the temperature of the main reactor is controlled at 200°C; the ammonia gas preheating temperature is 200°C, and the ammonia gas flow meter 7 is passed into the upper inlet of the main reactor 1 , and then bubbling at the bottom of the reactor to fully contact with caprolactam and the catalyst, the temperature of tube-and-tube reaction zone 2 is controlled at 250°C, and the molar ratio of ammonia gas to caprolactam is 30:1.

[0059] The reaction product and excess ammonia gas overflow from the outlet at the upper end of the main reactor 1 and...

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Abstract

The invention provides a method for preparing 6-aminocapronitrile. According to the method, caprolactam and ammonia gas are used as raw materials, phosphoric acid or phosphate is used as the catalyst, the 6-aminocapronitrile is prepared through the liquid phase reaction, and the method is solvent-free, low in temperature, low in energy consumption, high in reaction conversion rate, high in selectivity and simple in preparation process.

Description

technical field [0001] The invention belongs to the technical field of preparation of 6-aminocapronitrile, in particular to a continuous method for preparing 6-aminocapronitrile by a caprolactam liquid phase method. Background technique [0002] 6-Aminocapronitrile is an important chemical intermediate that can be used to produce 1,6-hexanediamine by complete hydrogenation, and 1,6-hexanediamine can be used to produce the polymer nylon 66. At present, the preparation of 6-aminocapronitrile is mainly obtained by partial hydrogenation of 1,6-adiponitrile, such as patent CN1100752C. There are not too many patents on the preparation of 6-aminocapronitrile from caprolactam. At present, the method of preparing 6-aminocapronitrile from caprolactam can be divided into gas phase method and liquid phase method according to the reaction state of caprolactam. Among them, the gas phase method reacts High temperature and large energy consumption, such as patent CN107602416A. The tempera...

Claims

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Application Information

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IPC IPC(8): C07C253/20C07C253/34C07C255/24
CPCC07C253/20C07C253/34C07C255/24
Inventor 谢增勇杨学林王耀红王树平刘东磊陈西波党伟荣
Owner BEIJING RISUN TECH CO LTD
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