原三塔串联精馏工序中存在以下问题：①粗产品中含水量超过0.03%的要求

The following problems exist in the original three-tower series distillation process: ①The water content of the crude product exceeds the requirement of 0.03%; ②The water content of the ethanol recovered in the second tower is high, which makes it unable to be used as a raw material for catalyst preparation; ③The water content is not effective The control of the catalyst causes uneven destruction of the catalyst, which indirectly leads to a reduction in the quality of the product. For this reason, a large number of domestic scholars continue to improve the technology to solve all these problems. The solution is as follows: change the original pressure operation of the first tower to normal pressure operation; add sufficient distilled water to the original catalyst destruction system to fully destroy it; produce ethyl acetate, acetaldehyde, and acetaldehyde at the top of a tower Ethanol and water are used to remove water and acetaldehyde. A certain amount of water is added to the extracted top liquid to serve as the catalyst destruction liquid; through the improvement of the process, the water content of the second and third towers can be controlled, and the finished acetic acid The water content of ethyl ester has also dropped to 0.01%.

There are the following problems in the original three-tower series distillation process: (1) the water content of crude products exceeds 0.03%, (2) the high water content of ethanol recovered by the two towers is high, resulting in its inability to be used as a catalyst raw material, and (3) the water content is not effectively controlled, so that the catalyst damage is uneven, which indirectly leads to a decrease in the quality of the product. To this end, a large number of domestic scholars continue to improve the process, will be all these problems to solve. The solution is as follows: change the pressurization operation of the original tower to normal pressure operation, add sufficient distilled water to the original catalyst destruction system to cause full damage, and extract ethyl acetate, acetaldehyde, ethanol, water to achieve dehydration at the top of a tower And the purpose of acetaldehyde, the extraction of the top liquid to add a certain amount of water as a catalyst to destroy the liquid, through the improvement of the process, so that the water content of the second and third towers can be controlled, the water content of the finished ethyl acetate also decreased to 0.01%.

There are the following problems in the original three column series distillation process: 1) the water content in the crude product exceeds the requirement of 0.03%; ② The water content of ethanol recovered from the second tower is high, so it can not be used as raw material for catalyst preparation; ③ If the water content is not controlled effectively, the catalyst will be destroyed unevenly, which indirectly leads to the decrease of product quality. Therefore, a large number of domestic scholars continue to improve the process and solve all these problems. The solution is as follows: change the pressure operation of the first tower to normal pressure operation; Add enough distilled water into the original catalyst destruction system to make it fully destroyed; Ethyl acetate, acetaldehyde, ethanol and water are extracted from the top of the first tower to remove water and acetaldehyde; Through the improvement of the process, the water content of the second tower and the third tower can be controlled, and the water content of the finished ethyl acetate can also be reduced to 0.01%.<br>