Process for producing halogen-containing phosphate ester
AssigneeDaihachi Chemical Industry Co., Ltd.
InventorShin Nakamura
Life of this patent
Estimating the term…
Abstract
A process for producing a halogen-containing phosphate ester includes the steps of: (i) reacting a phosphorus halide selected from the group consisting of phosphorus oxyhalides and phosphorus pentahalides with a halogen-containing hydroxy compound to obtain a reaction mixture including a halogen-containing phosphate ester, (ii) purifying the halogen-containing phosphate ester by adding an aqueous medium selected from the group consisting of water, neutral aqueous solutions, acidic aqueous solutions and basic aqueous solutions to the reaction mixture to crystallize the halogen-containing phosphate ester, and (iii) distilling waste water from the purification step.
Claims12
A process for producing a halogen-containing phosphate ester, comprising the steps of:
- (i) reacting a phosphorus halide selected from the group consisting of phosphorus oxyhalides and phosphorus pentahalides with a halogen-containing hydroxy compound to obtain a reaction mixture including a halogen-containing phosphate ester,
- (ii) purifying the halogen-containing phosphate ester by adding an aqueous medium selected from the group consisting of water, neutral aqueous solutions, acidic aqueous solutions and basic aqueous solutions to the reaction mixture to crystallize the halogen-containing phosphate ester, and
- (iii) distilling waste water after crystallization of the halogen-containing phosphate ester.
A process for treating waste water generated during production of a halogen-containing phosphate ester comprising distilling the waste water after crystallization of the halogen-containing phosphate ester, wherein the halogen-containing phosphate ester has been crystallized by adding an aqueous medium selected from the group consisting of water, neutral aqueous solutions, acidic aqueous solutions and basic aqueous solutions to a reaction mixture, wherein the reaction mixture is obtained by reacting a phosphorous halide selected from the group consisting of phosphorous oxyhalides and phosphorous pentahalides with a halogen-containing hydroxy compound.
Dependencies are inferred from the claim text.