A kind of benzaldehyde distillation anti-coking agent

Abstract

The invention provides an anti-coking agent for distillation of benzaldehyde, which is composed of following raw materials, by weight: 3-5% of pyridine, 15-20% of imidazole, 5-10% of thiazole, 15-30% of quinoline, 10-20% of furan and the balanced being pryimidine. The anti-coking agent is added into a benzaldehyde distillation still during a purification and rectification process of the benzaldehyde with addition concentration being not more than 100 ppm. The anti-coking agent can effectively prevent a coking problem during the distillation of the benzaldehyde. During the purification and rectification process of the benzaldehyde, by-products generated in distillation can be reduced and polymerization of the benzaldehyde at the bottom of the distillation still can be inhibited, thereby improving scaling problem in the distillation still, preventing generation of coking products and improving the yield of benzaldehyde by about 20%.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a benzaldehyde distillation anti-coking agent used in the benzaldehyde purification and rectification process. Background technique [0002] In the production process of benzaldehyde, the purification of benzaldehyde is completed through the rectification process. In the rectification process, due to the influence of high temperature, chloride ion, iron and other factors on the material, the polymerization and coking of benzaldehyde will be caused, resulting in the collection of benzaldehyde. At the same time, a large amount of dark brown organic polymers will be produced at the bottom of the distillation tank. These polymers are charred bodies formed by the polymerization of impurities. At present, no research results have been found to show that the charred bodies produced by the purification of benzaldehyde can have suitable uses. However, if the coke is discharged, ...

AI Technical Summary

Problems solved by technology

[0002] In the production process of benzaldehyde, the purification of benzaldehyde is completed through the rectification process. In the rectification process, due to the influence of high temperature, chloride ion, iron and other factors on the material, the polymerization and coking of benzaldehyde will be caused, resulting in the collection of benzaldehyde. At the same time, a large amount of dark brown organic polymers will be produced at the bottom of the still. These polymers are charred bodies formed by the polymerization of impurities. No research results have been found to show that the charred bodies produced by the purification of benzaldehyde can have suitable uses. However, if the coke is discharged, it will cause a huge environmental pressure on the environment, and so far, there is no research result on the effective prevention of benzaldehyde distillation coking