Standard Oil Company (indiana)

Amoco Corporation

The Standard Oil Company

Clifton S Goddin, Jr

Edward A Turek

Boyd A George

John W Palm

Robert L Reed

Russell L McGalliard

Boyd E Cabanaw

Luther E Petty

In a preferred embodiment, carbon dioxide and hydrogen sulfide are removed from a gaseous stream also containing a recoverable hydrocarbon product by CO.sub.2 sweetening, bulk CO.sub.2 removal, and hydrocarbon sweetening absorption steps, each absorption utilizing the same alkanolamine as absorbent. According to another aspect, each amine can be selected from the group consisting of tertiary amines and sterically hindered amines. According to yet another aspect, a feed gas comprising hydrogen sulfide and carbon dioxide can be introduced successively into a carbon dioxide sweetening absorption zone, then into a bulk CO.sub.2 removal absorption zone, then into a hydrocarbon sweetening absorption zone. Alternatively, a feed gas comprising hydrogen sulfide and carbon dioxide can be introduced first into a bulk CO.sub.2 removal absorption zone and then streams from the bulk CO.sub.2 removal zone can be provided respectively to the hydrocarbon sweetening absorption zone and the CO.sub.2 sweetening absorption zone.

Process for producing sweet CO.sub.2 and hydrocarbon streams

Carbon dioxide is removed from CO.sub.2 and hydrocarbon containing gaseous streams. In the instance where the hydrocarbons and CO.sub.2 are such that hydrocarbons would condense out during CO.sub.2 removal, the gas stream is treated in one or more stages to accomplish hydrocarbon composition control.

CO.sub.2 removal from high CO.sub.2 content hydrocarbon containing

CO.sub.2 Removal from high CO.sub.2 content hydrocarbon containing

Carbon dioxide is removed from a carbon dioxide containing hydrocarbon stream having a varying composition of light lean oil components in the C.sub.3 through C.sub.10 range. A light lean oil recycle stream of predetermined carbon number range is produced and utilized in the cryogenic distillative process.

Cryogenic distillative removal of CO.sub.2 from high CO.sub.2 content

Claus process sulfur recovery can be improved by performing a Claus conversion under low temperature and low water concentration conditions. The process treats a feed stream containing sulfur compounds by conversion of all sulfur components to hydrogen sulfide, water removal to low water concentrations, creation of a Claus reaction mixture, and then low temperature catalytic conversion to sulfur and water.

Low temperature Claus process with water removal

A cryogenic process for separating relatively pure fractions of methane and carbon dioxide from mixtures thereof which also contain other components. The process utilizes a lean oil as an absorbent which performs the additional functions of preventing the formation of solid carbon dioxide within the apparatus and preventing formation of an azeotrope of carbon dioxide with ethane and enhancing the separation of hydrogen sulfide from carbon dioxide.

Process for separating relatively pure fractions of methane and carbon

An improved method of regenerating a low temperature Claus catalyst bed having elemental sulfur deposited on the catalyst involving initially using a moderately hot effluent gas (typically 600.degree. to 650.degree. F.) from the first conventional Claus reactor to warm up the low temperature Claus reactor and remove deposited sulfur and after the outlet temperature of said low temperature reactor reaches a value high enough to decompose COS and CS.sub.2 (typically 600.degree. to 650.degree. F.), supplementing the moderately hot first conventional Claus reactor effluent gas with hot (typically 1000.degree. to 1200.degree. F.) waste heat boiler effluent such that the temperature of the regenerating catalyst bed can be elevated to about 700.degree. F. or higher. The intentional temperature excursion to about 700.degree. F. during catalyst regeneration improves the degree of regeneration of the catalyst bed, promotes higher catalyst activity and extends the catalyst life.

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Tulsa, OK, United States of America

Clifton S Goddin, Jr