1. Acetylene method Firstly, acetylene and formaldehyde were reacted at 98kPa and 80-95°C in the presence of a Cu-Bi catalyst to prepare 1,4-butynediol. The latter is then catalyzed by framework nickel and hydrogenated to 1,4-butenedioate at 1.372-2.06 MPa and 50-60°C, followed by further catalytic hydrogenation with Ni-Cu-Mn/Al2O3 (13.7-20.6 MPa). , 120-140 ° C) into 1,4-butanediol, ion-exchange resin to remove metal ions, and then purified by distillation to obtain a pure product.
2. Maleic anhydride hydrogenation method 3. Butadiene method: 1,3-butadiene reacts with acetic acid and oxygen to generate 1,4-diacetoxy-2-butene, followed by hydrogenation. Made by hydrolysis. 4. 1,4-Dichlorobutene Process 1,4-Dichlorobutene Butene is an intermediate product of the butadiene production chloroprene process. Using it as a raw material, it is hydrolyzed and hydrogenated to obtain 1,4-butanediol.