E.i. Dupont De Nemours and Company

Joseph M Fremont

Donald I Garnett

An improved three stage process for preparing agglomerates of spheroidal masses of malachite crystals in which the formation of pH gradients during addition of ingredients to the third stage is avoided.

Process for preparing crystalline malachite

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.

Agglomerates of malachite and method for their preparation

Preparation of butynediol

Agglomerates of malachite crystals and method for their preparation

A process for preparing a furan compound by contacting a diolefin such as butadiene with a catalyst at a low pressure and a low temperature is provided. In this process, a diolefin, an oxygen-containing gas and water containing HCl are contacted with a catalyst which is a support having deposited thereon copper chloride, an alkali metal chloride and at least one of palladium chloride and iodide, usually cuprous iodide. Temperature of the reaction is usually in the range of about 80.degree.-125.degree. C. and the pressure is usually in the range of about 1-5 atmospheres. Cyclic operation between furan production and catalyst oxidation is also provided.

Copper chloride containing catalysts for the preparation of furan

A process for preparing a furan compound by contacting a diolefin such as butadiene with a catalyst at a low pressure and a low temperature is provided. In this process, a diolefin, an oxygen-containing gas and water containing HCl are contacted with a catalyst which is a support having deposited thereon copper chloride, and alkali metal chloride and at least one of palladium chloride and iodide, usually cuprous iodide. Temperature of the reaction is usually in the range of about 80.degree.-125.degree. C. and the pressure is usually in the range of about 1-5 atmospheres. Cyclic operation between furan production and catalyst oxidation is also provided.

Preparation of furan compounds

Synthetic malachite of desirable particle size and distribution is coprecipitated with small amounts of uniformly dispersed bismuth. After nucleation, the crystals are grown at elevated temperatures. The malachite can be converted into a cuprous acetylide complex useful as an ethynylation catalyst.

Butinediol using catalyst prepared from synthetic malachite

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.

Preparation of butynediol using bismuth modified spheroidal malachite

Preparation of bismuth modified spheroidal malachite

Synthetic malachite of desirable particle size and distritution is coprecipitated with small amounts of uniformly dispersed bismuth. After nucleation, the crystals are grown at elevated temperatures. The malachite can be converted into a cuprous acetylide complex useful as an ethynylation catalyst.

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Glen Mills, PA, United States of America

Joseph M Fremont