Method for producing 1, 4-butanediol

The invention relates to a method for producing 1, 4-butanediol. By the aid of the method, problems of high energy consumption and poor economical efficiency in the prior art mainly can be solved. According to the technical scheme, the method for producing the 1, 4-butanediol has the advantages that processes for producing maleic anhydride and processes for producing BDO (butanediol) are combined with one another, and accordingly original rich oil desorption and solvent treatment equipment and energy consumption of devices for producing maleic anhydride by the aid of n-butane processes can be omitted; impurities generated by a device for producing maleic anhydride and impurities generated by a device for producing BDO can be removed together, and the device cost can be saved; butanol is used as a maleic anhydride esterification raw material for generating dibutyl maleate (DBM), butanol byproducts generated in hydrogenation phases can be utilized, and accordingly the production cost of the 1-4-butanediol can be reduced; butanol separation procedures are improved and modified at butanol separation and purification steps, accordingly, the problems can be effectively solved by the aid of energy-saving effects, and the method can be used for producing the 1-4-butanediol.