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US 4,727,166 AGranted
Agglomerates of malachite and method for their preparation
AssigneeE. I. Du Pont de Nemours and Company
InventorJoseph M. Fremont
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Abstract
Agglomerates of spheroidal masses of malachite crystals are prepared so that they contain silicic acid. These agglomerates can be used to prepare a copper-acetylide complex, which in turn can be used as a catalyst for the preparation of 1,4-butynediol from acetylene and formaldehyde.
Claims4
A process for the formation of a copper-acetylide complex, the process comprising subjecting agglomerates of spheroidal masses of malachite crystals, which crystals contain 1-7%, by weight, of bismuth oxycarbonate and 0.5-3.5%, by weight (calculated as SiO.sub.2) of silicic acid, to the action of acetylene and formaldehyde.
Dependencies are inferred from the claim text.