1, 4-butanediol is widely used. More than half are used in the production of tetrahydrofuran in the United States and Western Europe, followed by γ-butylactone and polybutylene terephthalate, the latter is a rapidly developing engineering plastics; 1, 4-butanediol is used as chain extender and polyester raw material to produce polyurethane elastomers and soft polyurethane foams. The esters of 1, 4-butanediol are good plasticizers for cellulose, polyvinyl chloride, polyacrylate and polyester. 1, 4-butanediol has a good hygroscopic flexibility, can be used as gelatin softener and absorbent, cellophane and other non-paper primer. It can also prepare N-methylpyrrolidone, n-vinylpyrrolidone and other pyrrolidone derivatives. It is also used in the preparation of vitamin B6, pesticides, herbicides and solvents, plasticizers, lubricants, humidifiers, softeners, adhesives and brighteners for the electroplating industry.

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