Cuprous chloride-potassium chloride catalyst for polymerising acetylene to vinylacetylenes

摘要

529,796. Vinyl-acetylenes. DU PONT DE NEMOURS & CO., E. I. May 26, 1939, No. 15791. Convention date, May 26, 1938 [Class 2 (iii)] In the production of vinyl acetylenes and related compounds by polymerization of acetylene. a catalyst is used containing 19-30 per cent. of potassium chloride, 40-51 per cent. of cuprous chloride and 30 per cent. of water and preferably hydrochloric acid. Examples are given, in one of which the products are dried over calcium carbide and condensed by cooling at -60‹C. The chlorine in the product is estimated periodically and a corresponding quantity of hydrochloric acid added to maintain the composition of the catalyst. Specifications 438,548, 445,358 and 451,442 are referred to.