Solvents for bulk removal of organics from coal-conversion condensate waters. [Methyl isobutyl ketone, diisopropyl ether and mixture of 25% w/w trioctyl phosphine oxide in diisobutyl ketone]

Conference · Tue Mar 01 04:00:00 EST 1983

OSTI ID:6144162

Mohr, D H; King, C J

In this work chemical analyses and experimental tests of extraction solvents are discussed for condensate waters from a coal gasification plant. The results of the study showed that methyl isobutyl ketone (MIBK) provides much higher distribution coefficients than diisopropyl ether DIPE for phenol and dihydroxybenzenes. About 90% of the chemical oxygen demand (COD) from one condensate water sample had a sufficiently high K/sub D/ into MIBK that it could be removed by this solvent in a counter-current extraction process at an economically reasonable solvent-to-water ratio. TOPO (mixture of 25% w/w trioctyl phosphine oxide in diisobutyl ketone) in a suitable diluent has high equilibrium distribution coefficients for phenols and dihydroxybenzenes, and therefore has the potential to remove these compounds at lower solvent-to-water ratios. However, this solvent may be difficult to regenerate in a continuous condensate-water extraction process. Analytical techniques are discussed that provide higher recoveries for phenols and dihydroxybenzenes as compared to the standard MC/GC-MS technique. Hydantoins have been identified in four condensate water samples. About 20 to 30% of the COD remains unidentified in these four condensate water samples. Some of these unidentified compounds have very low values of K/sub D/ for extraction into MIBK. More information is required about these unidentified solutes before reliable solvent extraction processes can be designed. 6 tables.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6144162
• Report Number(s): LBL-15870; CONF-830808-7; ON: DE83012475
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
010600 -- Coal
Lignite
& Peat-- Properties & Composition
010800 -- Coal
Lignite
& Peat-- Waste Management
AROMATICS
CHEMICAL ANALYSIS
CHEMICAL OXYGEN DEMAND
CHROMATOGRAPHY
COAL GASIFICATION PLANTS
COMPARATIVE EVALUATIONS
DATA
EXPERIMENTAL DATA
EXTRACTION
GAS CHROMATOGRAPHY
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INDUSTRIAL PLANTS
INFORMATION
LIQUID COLUMN CHROMATOGRAPHY
LIQUID WASTES
MASS SPECTROSCOPY
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
OXYGEN COMPOUNDS
PHENOL
PHENOLS
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENTS
SPECTROSCOPY
WASTE WATER
WASTES
WATER