Preparation of butynediol using bismuth modified spheroidal malachite
AssigneeE. I. Du Pont de Nemours and Company
InventorJoseph M. Fremont
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Abstract
Spheroidal agglomerates of malachite crystals are prepared by bringing together solutions of a cupric salt, a bismuth salt and an alkali metal carbonate or bicarbonate to form a mixture containing amorphous hydrated copper carbonate, and then holding the mixture, without agitation, at a temperature of less than about 55.degree. C.
Claims2
In the production of 1,4-butynediol by reacting acetylene and formaldehyde in the presence of a copper acetylide catalyst, the improvement of using as a catalyst a complex produced by converting spheroidal agglomerates of basic copper carbonate crystals, at least about 80% of the agglomerates being 5 to 12 microns in the longest dimension, the agglomerates containing 1 to 4% by weight of bismuth oxycarbonate, to copper acetylide complex by slurrying the agglomerates in water and subjecting them to the action of formaldehyde and acetylene, the agglomerates produced
- (a) forming amorphous gel-like hydrated copper carbonate by bringing together, in aqueous solution, with mixing, at a temperature less than about 55.degree. C., enough of
- (1) a cupric salt,
- (2) a bismuth salt, and
- (3) an alkali metal carbonate or an alkali metal bicarbonate, to yield a mixture with a pH value of 5.5 to 7.5;
- and then
- (b) holding the mixture of (a), without agitation, at a temperature less than about 55.degree. C. until the agglomerates are formed.
Dependencies are inferred from the claim text.