Acrylonitrile production system
A production system and technology for acrylonitrile, applied in the purification/separation of carboxylic acid nitrile, chemical industry, hydrocarbon ammoxidation preparation, etc., can solve the problems of unreasonable utilization of heat energy, energy waste, etc. The effect of saving energy and reducing work intensity
Pending Publication Date: 2021-03-05
中石油吉林化工工程有限公司
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Problems solved by technology
However, a large amount of heat energy in poor water has not been rationally utilized, resulting in a waste of energy
Method used
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[0073] According to one embodiment of the present invention, the acetic acid adder 11 includes a preparation tank (not shown in the figure) and a metering pump (not shown in the figure), and the metering pump is connected to the first acetic acid inlet 904 and the second material inlet 1001 respectively. The 50wt% acetic acid solution inside the preparation tank is added to the first condenser 9 by a metering pump to suppress the polymerization of prussic acid and control the pH value, and is added to the second condenser 10 by a metering pump to suppress the prussic acid polymerization. In this embodiment, the acetic acid added by the acetic acid adder 11 to the second condenser 10 first enters the gas phase pipeline (that is, the connecting pipeline between the second material inlet 1001 and the non-condensable gas phase product outlet 903), and enters from the upstream In the second condenser 10. Acetic acid is added respectively in the first condenser 9 and the second con...
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The invention relates to an acrylonitrile production system. The acrylonitrile production system comprises a reaction unit, a recovery unit, a refining unit and a quadruple-effect evaporation unit which are sequentially connected from upstream to downstream. The recovery unit comprises a quench tower and an absorption tower. The refining unit comprises a recovery tower, a recovery tower reboiler,a reboiler heat source main pipe, a reboiler heat source branch pipe and a recovery tower temperature controller. A flow regulating valve is arranged on the reboiler heat source branch pipe, and the flow regulating valve and the recovery tower temperature controller carry out cascade regulation. The refining unit further comprises a buffer tank connected with the tower kettle of the recovery tower. The refining unit further comprises a hydrocyanic acid removal tower, a hydrocyanic acid removal tower reboiler connected with the buffer tank and the hydrocyanic acid removal tower, a finished product tower and a finished product tower reboiler connected with the buffer tank and the finished product tower. Small-range flow control of the system can be met, and high-precision adjustment of heatsource flow is achieved. The content of acetic acid in a condenser of the hydrocyanic acid removal tower can be better controlled. Heat energy of lean water in the tower bottom of the recovery tower can be recycled by utilizing temperature difference. The liquid level of the condenser can be automatically adjusted.
Description
technical field [0001] The invention relates to the field of acrylonitrile production, in particular to an acrylonitrile production system. Background technique [0002] The production technology of acrylonitrile in the world is mainly based on propylene and ammoxidation. In recent decades, with the continuous upgrading of catalysts and continuous improvement of process flow, the technological route of producing acrylonitrile by propylene and ammoxidation still maintains a leading position. The process flow of the main unit of acrylonitrile includes: reaction part, recovery part, refining part and four-effect evaporation part. [0003] The recovery tower in the refining part is an extractive distillation tower with water as a solvent. The function of this tower is to recover and resolve acrylonitrile, hydrocyanic acid and acetonitrile from the absorption liquid (water-rich). Acrylonitrile and hydrocyanic acid are distilled from the top of the tower, and the liquid containi...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C07C253/26C07C253/34C07C255/08
CPCC07C253/26C07C253/34C07C255/08Y02P20/50
Inventor 陆玲李大伟刘清娟聂殿涛
Owner 中石油吉林化工工程有限公司