Alcohol circulation evaporation system in the production of acetaldehyde

Abstract

The invention discloses an alcohol cycle evaporation system in acetaldehyde production, and belongs to the field of chemical engineering product processing. The system comprises an evaporation tower, an alcohol tower first-stage condenser, an alcohol cycle heater, a hot water tank and a hot water pump, the hot water outlet of the alcohol tower first-stage condenser is connected with the hot water tank, the hot water tank is connected with the hot water pump, the hot water pump is connected with the water inlet of the alcohol cycle heater, the water outlet of the alcohol cycle heater is connected with the water return opening of the alcohol tower first-stage condenser, the lower part of the evaporator is connected with the alcohol inlet of the alcohol cycle heater, and the upper part of the evaporation tower is connected with the alcohol outlet of the alcohol cycle heater. The invention also provides a new alcohol cycle evaporation technology system for cycle heating of hot water and continuous discharging of pollution. The technology system realizes evaporation without evaporating alcohol by steam, so the energy saving effect is obvious, and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to a chemical product production equipment, in particular to an alcohol circulation evaporation system in the production of acetaldehyde. Background technique [0002] In the process of ethanol catalytic oxidation to produce acetaldehyde, alcohol evaporation is essentially a simple distillation process, through which the alcohol and water in the alcohol aqueous solution in the evaporator are simultaneously turned into steam. Alcohol evaporation is carried out with air blowing in, and the air enters the evaporator as a raw material, so that the alcohol evaporator operates under pressure. The purpose of maintaining a certain pressure for alcohol evaporation is to overcome the system resistance and prevent the burning reaction gas from being pushed back to the evaporator, which has no positive significance for the oxidation reaction. [0003] In the traditional acetaldehyde production process, the structure of the evaporator is gene...

AI Technical Summary

Problems solved by technology

In order to reduce the load of the rectification system, most of the blowdown of the evaporator adopts the intermittent form, so that this part of alcohol containing impurities enters the dilute acetaldehyde tank, and enters the rectification system together with the rectification feed, resulting in changes in the feed composition, thereby affecting the acetaldehyde. Aldehyde distillation system process

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