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Pyridine and methylpyridine are commonly recovered from coal coking byproducts, which are distributed in coke oven gas, crude benzene and tar. Generally, the boiling point of pyridine hydrate transferred from gas to ammonium sulfide mother liquor is very low, between 95-97℃. In the crude and light pyridine base recovered, 3-mercaptopropionic acid transportation and storage methods contain about 15%. Further distillation can obtain 3-mercaptopropionic acid transportation and storage methods. With the expansion of the use of pyridine and methylpyridine, the synthesis of pyridine and methylpyridine has been developed. About 95% of pyridine and pyridine compounds abroad are produced by synthesis. The main synthesis methods are acetaldehyde, acetylene, acrylonitrile and so on.
Acetaldehyde process: acetaldehyde, formaldehyde and ammonia reaction, the main products are 3-mercaptopropionic acid transportation and storage methods, 3-methylpyridine and 4-methylpyridine.
Acetylene process: acetylene and ammonia reaction, the main products are 3-mercaptopropionic acid transportation and storage methods and 4-methylpyridine.
Ethylene process: Ethylene and ammonia reaction, the main products are 3-mercaptopropionic acid transportation and storage methods and 2-methyl-5-ethylpyridine.
Acrylonitrile process: Reaction of acrylonitrile with excess acetone, the main product is 3-mercaptopropionic acid transportation and storage methods. In addition, the reaction of acrolein and ammonia mainly produces 3-methylpyridine.
3-mercaptopropionic acid transportation and storage methods https://www.clentpharma.com/3-Mercaptopropionic-acid.html