Abstract: A process for scavenging hydrogen sulfide from gases, in which the hydrogen sulfide-containing gas is introduced into an aqueous glyoxal solution of at least 15% by weight strength at a pH of a solution of 5 to 11 until the molar ratio of glyoxal to hydrogen sulfide is 3 to 2. The solid reaction product obtained in this way, which contains the hydrogen sulfide in bound form, is separated off. Owing to its stability and insolubility in acids and bases, it can be disposed of without problems.
Type:
Grant
Filed:
January 23, 1991
Date of Patent:
February 4, 1992
Assignee:
Hoechst Aktiengesellschaft
Inventors:
Christoph Porz, Bernd Christensen, Elena Kyaw-Naing, Walter Gulden, Erich F. Paulus
Abstract: Trialkyl arsine (in particular trimethyl arsine) is removed from a fluid (e.g. a hydrocarbon-containing gas) by contacting the fluid with a sorbent material comprising (a) a transition metal polysulfide (preferably Fe.sub.2 (S.sub.3).sub.3, and (b) an inorganic support material (preferably alumina).
Type:
Grant
Filed:
November 28, 1990
Date of Patent:
November 12, 1991
Assignee:
Phillips Petroleum Company
Inventors:
Marvin M. Johnson, Patricia A. Tooley, Gary A. Delzer, Gerhard P. Nowack, Ted H. Cymbaluk
Abstract: A process for treating copper containing precious metal ores prior to cyanidation and recovery of the precious metal eg gold. The process involves addition to the ore before or after milling of a water soluble or water dispersible surface active agent in the form of a fatty alkyl amine preferably an ethoxylated fatty alkyl amine. The agent reduces the high cyanide consumption, which is caused by copper dissolution, by passivating the mineral surface.
Type:
Grant
Filed:
October 27, 1989
Date of Patent:
October 29, 1991
Assignee:
The British Petroleum Company p.l.c.
Inventors:
Charles A. Bennett, Elizabeth A. Crathorne, Raymond Edwards
Abstract: Calcium phosphate minerals are formed by using phosphoric acid substantially free of uncombined water in conjunction with a calcium source, normally as any combination of carbonate, phosphate and hydroxide, and, as required, any additional base to neutralize the phosphoric acid. Protein may be optionally added. The resulting product is readily formed and then sets to a hard, stable, workable shaped object.
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