Continental Oil Company

Richard L Every

Anthony G Fonseca

J Gilbert Davis, Ii

David S Dillard, Jr

Luino Dell'Osso, Jr

Urea is produced by reacting phosgene and ammonia, one of the reactants being in the liquid state and the other gaseous, at -50.degree. to -20.degree. C.

Low-temperature synthesis of urea

A process for removing methane from a subterranean coal deposit. A carbon dioxide-containing fluid is introduced into the coal deposit through an injection well and held therein for a period sufficient to enable a substantial amount of methane to be desorbed from the surfaces of the coal deposit. Following the hold period, the injected carbon dioxide-containing fluid and desorbed methane are recovered through a recovery well or wells spaced from the injection well. The process is repeated until sufficient methane has been removed to enable safe mining of the coal deposit.

Method for removing methane from coal

The present invention relates to an improved method of solution mining potassium chloride from subterranean ore deposits containing both potassium chloride and sodium chloride. By the present invention, an aqueous medium is passed through the ore deposits so that potassium chloride and sodium chloride are dissolved therein. Magnesium chloride is combined with the aqueous brine solution formed so that an aqueous brine solution containing potassium chloride, sodium chloride and magnesium chloride in specific proportions is produced, and the solubility of potassium chloride in the solution is reduced. The combined aqueous brine solution is then concentrated so that it is substantially saturated with potassium chloride, and the concentrated solution is cooled to cause the precipitation of substantially pure potassium chloride. Advantageously, the magnesium chloride combined with the aqueous brine solution is obtained by solution mining a second subterranean ore deposit containing magnesium chloride and combining the brine solutions formed.

Method of solution mining potassium chloride from subterranean deposits

The present invention relates to an improved method of transporting a sulfur-hydrocarbon slurry in a pipeline with a minimum of sulfur precipitation and adherence to the internal parts of the pipeline system. The improvement comprises maintaining the flow rate of the slurry to at least about the value given by the equation

Method of transporting a sulfur-hydrocarbon slurry in a pipeline

Urea is produced by reacting phosgene and ammonia, one of the reactants being in the liquid state and the other gaseous, at -50.degree. to -20.degree.C.

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Ponca City, OK, United States of America

Richard L Every