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How to Make 1,4-butanediol?
Dec. 12, 2022
1,4-Butanediol (CAS No. 110-63-4), is an organic substance with the appearance of colorless or light yellow oily liquid. Flammable, freezing point 20.1℃, refractive index 1.4461. soluble in methanol, ethanol, acetone, slightly soluble in ether. It is hygroscopic, with bitter odor and slightly sweet taste in the mouth.
Production Method
Acetylene Method
1,4-Butynediol was first made by the reaction of acetylene and formaldehyde in the presence of Cu-Bi catalyst at 98 kPa and 80-95°C. The latter is then catalyzed by nickel skeleton and hydrogenated at 1.372-2.06 MPa, 50-60°C to 1,4-butenedioate, followed by further catalytic hydrogenation with Ni-Cu-Mn/Al2O3 (13.7-20.6 MPa, 120-140°C) to 1,4-butanediol, which is then purified by distillation after the metal ions are removed by ion exchange resin to obtain the pure product.
Butadiene Method
Formaldehyde is reacted with acetylene in the presence of a copper catalyst at pH 5 to 8 and a molar ratio of formaldehyde to acetylene of at most 2:1.
The aqueous mixture containing butynyl diol obtained by intermediate buffering for 0.1 to 100 h.
The mixture obtained after intermediate buffering was hydrogenated and
The hydrogenation product obtained in the previous stage was distilled to give 1,4-butanediol.
Upstream and Downstream Products
Upstream raw materials:
Hydrogen, maleic anhydride, calcium carbide, formaldehyde.
Downstream products:
Polyvinylpyrrolidone, N-methylpyrrolidone, thermoplastic polyester, polybutylene succinate, polyurethane, polytetrahydrofuran, gamma-butyrolactone, tetrahydrofuran, polybutylene terephthalate.
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