A logistics heat recovery process and device in an acrylonitrile production device

Abstract

The invention provides a material flow heat recovering process in an acrylonitrile production device. The material flow heat recovering process comprises the following steps: extracting a material flow with a first terminal from a lateral line of an absorbing tower; pumping the material flow in an ammonia evaporator through a circulating pump of eh lateral line of the absorbing tower; cooling the material flow with the first terminal to a second terminal through the ammonia evaporator; cooling the material flow with the second terminal to a third temperature through a propylene evaporator; and cooling the material flow with the third terminal to a fourth terminal through a cooler. According to the material flow heat recovering process, the probability that the propylene evaporator and an S5 material flow pipeline are blocked can be remarkably reduced, the safety of the production of a propylene device is improved; meanwhile, the effective heat transfer temperature difference of the ammonia evaporator and the propylene evaporator is remarkably improved, the required heat exchange area is reduced, and the manufacturing cost of equipment is lowered.

Description

technical field [0001] The invention relates to a logistics heat recovery process and a device thereof, in particular to a logistics heat recovery process and a device thereof in an acrylonitrile production device. Background technique [0002] Acrylonitrile is a basic organic chemical product and the basic raw material of the three major synthetic materials - synthetic fiber, synthetic rubber, and plastic. Various chemical materials synthesized from it can be seen in all aspects of daily life. The rapid development of the petrochemical industry in recent years has provided a large amount of raw materials for the production of acrylonitrile. On the basis of traditional applications, acrylonitrile has also achieved rapid development in the fields of fine chemicals and deep processing, and has continuously developed new application fields. [0003] At present, more than 95% of acrylonitrile production in the world adopts ammonia and propylene oxidation. At present, there are...

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Problems solved by technology

[0009] Aiming at the disadvantages of large heat exchange area, small effective heat transfer temperature difference and high manufacturing cost in the heat recovery process of the side stream of the absorption tower in the acrylonitrile production device in the prior art, the present invention provides a heat exchange Process and device for recovering heat from side stream of absorption tower in acrylonitrile production device with small area, large effective heat transfer temperature difference and low manufacturing cost

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