Simultaneous stripping and solvent extraction for the recovery of ammonia and acid gases from wastewaters

Technical Report · Sun Apr 01 04:00:00 EST 1984

OSTI ID:7128127

Mackenzie, P D; King, C J

A processing approach is proposed which has the potential for reducing energy requirements for the recovery of ammonia and acid gases (e.g. CO/sub 2/ and H/sub 2/S) from wastewaters. Two separation processes, solvent extraction and steam stripping, are carried out simultaneously. One process preferentially removes the acid gases, the other the basic gas (NH/sub 3/). The key to the process is the identification of a suitable solvent for one of the components. No common solvents were found to be effective for extraction of either CO/sub 2/ or H/sub 2/S at the usual pH of such wastewaters. Only liquid cation exchangers were found to be suitable extractants for ammonia. Solvents containing an acid of intermediate strength, di-2-ethylhexyl phosphoric acid (D2EHPA) have more favorable properties. Diluent choice affected the properties of D2EHPA-containing solvents. Batch experiments comparing solvent extraction/stripping with stripping alone confirmed that the former resulted in increased CO/sub 2/ volatility and served to isolate NH/sub 3/ from CO/sub 2/. Analysis of the overall economics of the process indicates that costs for replenishment of D2EHPA due to aqueous solubility losses and for the energy to regenerate the solvent are dominant. An improved extractant is needed if this approach is to offer economical advantages over other established approaches for recovering and isolating ammonia from such water streams.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7128127
• Report Number(s): LBL-17740; ON: DE84011816
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
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040900 -- Oil Shales & Tar Sands-- Waste management
AMMONIA
BITUMINOUS MATERIALS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
COAL LIQUEFACTION
DECOMPOSITION
DENITRIFICATION
DESULFURIZATION
ELECTRON LOSS
ENERGY SOURCES
EXTRACTION
FOSSIL FUELS
FUELS
GASIFICATION
HYDRIDES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INORGANIC ACIDS
LIQUEFACTION
LIQUID WASTES
MANAGEMENT
MATERIALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OIL SHALES
ORGANIC SOLVENTS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORIC ACID
PROCESSING
REMOVAL
RETORTING
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SOLVENTS
STEAM
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER