Reducing color formers in 1,4-butanediol
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn S. Coates
Life of this patent
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Abstract
1,4-Butynediol is catalytically hydrogenated under conventional conditions to produce a reaction product containing 1,4-butanediol. This reaction product is then hydrogenated under acid conditions, i.e., pH 1-6 and temperatures of 120.degree.-150.degree. C., to produce a 1,4-butanediol product. Upon further separation, the 1,4-butanediol is practically free from compounds that would produce color when the diol is used to make polyesters.
Claims7
In the process for preparing 1,4-butane-diol by the catalytic hydrogenation of 1,4-butynediol the improvement comprising subjecting the hydrogenation reaction product to acid hydrogenation at a pH of 1-6 and a temperature of 115.degree.-200.degree. C.
In the process for preparing 1,4-butanediol by the catalytic hydrogenation of 1,4-butynediol at a temperature of 60.degree.-150.degree. C. and hydrogen pressure of 2500-5500 psig in the presence of a hydrogenation catalyst at a pH of 7-12 to form a hydrogenation reaction product containing 1,4-butanediol, the improvement comprising conducting an acid hydrogenation of the hydrogenation reaction product at a temperature of 115.degree.-200.degree. C., hydrogen pressure of 2500-5500 psig and a pH of 1-6 in the presence of a hydrogenation catalyst to form a reaction product containing 1,4-butanediol.
Dependencies are inferred from the claim text.