[Pretreatment of benzoic acid wastewater].
The benzoic acid wastewater produced from toluene by liquid-phase oxidation is one of the difficult wastewater to treat because of multi-component, high CODcr value (20,000-100,000 mg/L) and nonbiodegradability. A pretreatment way of this wastewater by extraction based on chemical complexation was carried out, and tributyl phosphate (TBP), trialkylamine (7301) and trialkyphosphine oxide (TRPO) were used as complexing agent with n-octanol, kerosene as cosolvent and diluent respectively. Results showed that benzoic acid was recovery successfully and the CODcr value of wastewater was reduced to 1/6 of the initial value through multi-stages cross-flow extraction. Back-extraction was quite easy and the solvent could be reused.
Li
Z
Z
Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Qin
W
W
Huang
Y
Y
Zhang
H
H
Dai
Y
Y
D019817:Benzoic Acid / Q000302:isolation & purification*; D007220:Industrial Waste; D012722:Sewage; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D012722:Sewage; D019817:Benzoic Acid