Hexamethylenediamine production system

Abstract

A hexamethylenediamine production system comprises at least two hydrogenation reactors, a gas-liquid separator and a gas-liquid separator, wherein the hydrogenation reactors are gas-liquid-solid three-phase fixed bed reactors, a heat exchange interlayer is arranged on the side wall of each hydrogenation reactor, and a heat exchange coil is arranged in each hydrogenation reactor; wherein the top ofeach hydrogenation reactor is connected with an adiponitrile source through a first feeding pipe, a first valve is arranged on each first feeding pipe, the bottom of each hydrogenation reactor is connected with a hydrogen source through a second feeding pipe, and a second valve is arranged on each second feeding pipe; the side wall of the hydrogenation reactor located at the high position is connected with a liquid-phase material source through a third feeding pipe and connected with the side wall of the hydrogenation reactor located at the low position through an overflow pipe, and the gas-liquid separator is arranged at the top of the corresponding hydrogenation reactor. The hexamethylenediamine production system is simple in structure and convenient to operate, can effectively reduce the mechanical loss of the catalyst, is convenient for enterprises to control the reaction temperature, and is beneficial to production of high-quality hexamethylenediamine products.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a production system of hexamethylenediamine. Background technique [0002] Chemical companies often use adiponitrile and hydrogen as raw materials to synthesize hexamethylenediamine in a solidified bed reactor. [0003] The existing production method of hexamethylenediamine is mainly hydrogenation of adiponitrile in the presence of a skeletal nickel catalyst to react. The reaction is divided into high-pressure method and low-pressure method: [0004] The high-pressure method uses cobalt-copper catalyst, the reaction temperature is 100-135°C, the pressure is 60MPa, and it is carried out in a three-phase fluidized bed reactor. The solvent is liquid ammonia. The equation is as follows: [0005] NC(CH 2 ) 4 CN+4H 2 → Co-Cu H 2 N(CH 2 ) 6 NH 2 [0006] The selectivity of hexamethylenediamine is about 90% to 95%. [0007] The low-pressure method uses adiponitrile and hydrogen...

AI Technical Summary

Problems solved by technology

However, in the currently used reactors, the catalyst installed in the reactor has a floating problem due to mechanical loss and damage, and the heat generated by the reaction is not easy to discharge, which is not conducive to the enterprise's control of the reaction temperature, and it is difficult to meet the needs of producing high-quality hexamethylenediamine.

Images