A kind of diketene multi-stage production method and device

Abstract

The invention relates to a multi-stage production method in the production of diketene, comprising the following steps: a. Transporting the released air after cracking and absorbing to 1#-3# circulating cooling tank, turning on the water ring vacuum pump for circulating cooling and absorbing, when absorbing When the concentration of acetic acid in the liquid reaches 15%, the absorption liquid is collected into the seed tank, and then the absorption liquid in the seed tank is pumped into the dilute acetic acid tank, and then enters the enrichment section for concentration; b. The waste gas after hydrolysis passes through the water washing tower After absorption, the exhaust gas from the water washing tower is directly sent to the sodium hydroxide absorption tower for neutralization and absorption with the waste water from butyl ester recovery and sodium hydroxide liquid. The absorbed exhaust gas (PH>8) is directly emptied, and the waste liquid is transported to the sewage c. The liquid after hydrolysis and the liquid in the water washing tower enter the dilute acetic acid tank and enter the thickening section. The invention has the advantages of reducing the consumption of glacial acetic acid and raw materials inside the system; digesting and absorbing the waste gas and sewage produced in the production process, and finally achieving the purpose of energy saving, emission reduction and environmental protection production.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to a production method of diketene, in particular to the extraction and recovery of the working fluid of a water ring pump vacuum pump in the production of diketene, and the recovery and utilization of waste gas, and also relates to a method for the production of diketene in multiple sections in the production of diketene Recovery unit. Background technique [0002] Diketene (C4H4O2), also known as acetylketene, is a colorless or slightly yellow liquid with a strong pungent odor. Because diketene contains two double bonds in its structure, it is highly unsaturated and is an important intermediate in organic synthesis. Body, is widely used in medicine, pesticides, dyes, food and other industries. [0003] There are many ways to synthesize diketene, and the most widely used and most common method is the acetic acid cracking method. Negative pressure is often used in the pr...

AI Technical Summary

Problems solved by technology

The main working fluid of the water ring pump vacuum pump is water, which mainly includes acetic anhydride, acetic acid, acetone, butyl ester, diketene, etc. in the circulation process, and the solution has a pungent smell, which not only needs to be disposed of at a cost, but also pollutes the environment; in addition In the original process, acetone recovery, butyl ester recovery, acetic acid recovery, and dilute acid recovery all have a certain amount of wastewater discharged. In the process of recovering dilute acid, acetone, and butyl ester, the discharged wastewater contains a large amount of water and a small amount of acetic acid, In addition to butyl acetate, it also contains a small amount of acetone, which not only increases the cost of sewage treatment, but also wastes energy

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