| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Research Abstract |
SOLUBILITY OF SALTS CAN BE DECREASED IN AQUEOUS ORGANIC LIQUID MIXTURES COMPARED WITH WATER. AND ALSO, MUTUAL SOLUBILITY OF THE MIXTURES VARIES WITH TEMPERATURE OR WITH ADDITION OF SALT. UTILIZATION OF SOLUBILITY CHARACTERISTICS IN THE SALT-WATER-ORGANIC LIQUID SYSTEM TO THE TREATMENT OF WASTE SOLUTIONS WAS EXAMINED WITH A SERIES OF ORGANIC LIQUIDS WHICH ARE TEA(TRIETHYL AMINE), DIPA(DIISO-PROPYL AMINE), TBPO(TRYBUTYL PHOSPHIN OXIDE), TMP(TRIMETYL PHOSPHATE), TEP (TRYETHYL PHOSPHATE), TBP(TRIBUTHYL PHOSPHATE), EGBE(ETHYLENE GLYCOL BUTYL ETHER), DEGHE(DIETHYLENEGLYCOL HEXYL ETHER) AND DEGHE(DIETHYLENE GLYCOL HEXYL ETHER).
MUTUAL SOLUBILITIES OF THE WATER-ORGANIC LIQUID SYSTEMS WERE DETERMINED IN THE TEMPERATURE RANGE OF 278K TO 333K. AQUEOUS SOLUTIONS OF TEA, DIPA, TBPO, EGBE AND/OR DEGHE HAVE THE LOWER CRITICAL SOLUTION TEMPERATURE RESPECTIVELY.
SALT EFFECTS ON THE MUTUAL SOLUBILITY OF THE SOLVENT MIXTURE, AND SOLVENT EFFECTS ON SOLUBILITY OF SALTS WERE DISCUSSED. THE SOLUBILITY OF THE O
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RGANIC LIQUIDS TESTED IN THE AQUEOUS SULFATE SOLUTIONS CAN BE EXPRESSED BY THE SEMIEMPIRICAL SETCHENOV SALTING EQUATION, AND THE SALTING COEFFICIENT DEPENDING ON THE NATURE OF SALT AND TEMPERATURE WAS CORRELATED WITH GIBBS FREE ENERGY OF AQUO-CATION FORMATION. LARGE SALTING OUT EFFECTS WERE OBSERVED IN THE TERNARY SYSTEMS METAL SULFATE-WATER-ORGANIC LIQUID ; THE MISCIBILITY GAP INCREASES WITH INCREASE IN TEMPERATURE AND CONCENTRATION OF SALT. IN TWO-LIQUID REGION, SULFATES ARE CONCENTRATED INTO AQUEOUS PHASE AND ORGANIC RICH PHASES CONTAINE SMALL AMOUNTS OF SALT. WHILE IN HOMOGENEOUS SOLUTION REGION, SOLUBILITY OF THE SALTS DECREASES WITH INCREASE IN CONCENTRATION OF THE ORGANIC LIQUID. THUS, THE ORGANIC LIQUIDS TESTED WERE EFFECTIVE FOR CONCENTRATION OR SEPARATION OF THE SULFATES INTO THE AQUEOUS PHASE OR FROM THE AQUEOUS SOLUTION.
RECOVERY OF THE ORGANIC LIQUID FROM AQUEOUS SOLUTION CAN BE DONE BY WARMING THE SOLUTION TO THE TEMPERATURE AROUND 333K, OR BY UTILIZING SALTING OUT EFFECT AND/OR EXTRACTION WITH TBP. Less
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