Abstract: Aqueous solutions comprising from about 35 to about 85% by weight of an alkanolaminium carboxylate have proven to be highly efficient absorption solvents for sulfur dioxide. Such solvents preferentially absorb sulfur dioxide from the gas streams containing large quantities of carbon dioxide. The rate at which dissolved sulfur dioxide oxidizes to non-regenerable sulfate salts is significantly reduced by such solvents.
Type:
Grant
Filed:
August 26, 1982
Date of Patent:
August 14, 1984
Assignee:
Trentham Corporation
Inventors:
H. Lee Trentham, John H. Crow, Farwell C. Boston
Abstract: Preferential sulfur dioxide absorption solvents may be buffered with suitable agents, such as alkanolaminium carboxylates, to substantially retard or eliminate the tendency of such solvents to degrade or accumulate non-regenerable salts, particularly sulfates, when loaded with absorbed sulfur dioxide. A method for employing the buffer as an immiscible aqueous phase as a separate trimming solvent to selectively absorb residual sulfur dioxide from a gas stream from which the bulk amount of sulfur dioxide is first removed by contact with a trialkyl phosphate solvent is disclosed. The method permits the trialkyl phosphate solvent to be regenerated and purged of salts at lower energy requirements.
Type:
Grant
Filed:
December 11, 1981
Date of Patent:
June 7, 1983
Assignee:
Trentham Corporation
Inventors:
H. Lee Trentham, John H. Crow, Farwell C. Boston
Abstract: Aqueous solutions comprising from about 35 to about 85% by weight of an alkanolaminium carboxylate have proven to be highly efficient absorption solvents for sulfur dioxide. Such solvents preferentially absorb sulfur dioxide from the gas streams containing large quantities of carbon dioxide. The rate at which dissolved sulfur dioxide oxidizes to non-regenerable sulfate salts is significantly reduced by such solvents.
Type:
Grant
Filed:
May 4, 1981
Date of Patent:
December 14, 1982
Assignee:
Trentham Corporation
Inventors:
H. Lee Trentham, John H. Crow, Farwell C. Boston
Abstract: Preferential sulfur dioxide absorption solvents may be buffered with suitable agents, such as alkanolaminium carboxylates, to substantially retard or eliminate the tendency of such solvents to degrade or accumulate non-regenerable salts, particularly sulfates, when loaded with absorbed sulfur dioxide. A method for employing the buffer as an immiscible aqueous phase as a separate trimming solvent to selectively absorb residual sulfur dioxide from a gas stream from which the bulk amount of sulfur dioxide is first removed by contact with a trialkyl phosphate solvent is disclosed. The method permits the trialkyl phosphate solvent to be regenerated and purged of salts at lower energy requirements.
Type:
Grant
Filed:
November 24, 1980
Date of Patent:
March 16, 1982
Assignee:
Trentham Corporation
Inventors:
H. Lee Trentham, John H. Crow, Farwell C. Boston
Abstract: A method is disclosed whereby carbon dioxide and methane in a gaseous mixture can be separated with little energy consumption when the gaseous mixture contains large amounts of carbon dioxide, i.e., from about 30 to about 90 mol percent. The method involves the fractionation of the gas mixture at a pressure below the critical pressure of the mixture and at a temperature above the triple point temperature of the mixture.