A method for simultaneously recovering neopentyl glycol and D-indophosphoprol from wastewater produced by D-indophosphoprolide production.

CN117924223BActive Publication Date: 2026-05-26HANGZHOU XINFU TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU XINFU TECH CO LTD
Filing Date
2024-01-16
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies are insufficient for the efficient separation and recovery of neopentyl glycol and D-indosulfonyl lactone from wastewater produced by D-indosulfonyl lactone production, resulting in product loss and increased treatment costs. Furthermore, the separation process is energy-intensive and causes serious environmental pollution.

Method used

A method combining polar and nonpolar solvent extraction with rare earth metal sulfate crystallization, followed by alkaline solution hydrolysis and ethyl acetate extraction, is used to achieve high-purity separation through the principle of similar compatibility and differences in solubility.

Benefits of technology

It improves the recovery rate and purity of neopentyl glycol and D-pantolactone, reduces energy consumption, and reduces environmental pollution, resulting in significant economic benefits.

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Abstract

This invention provides a method for simultaneously recovering neopentyl glycol and D-indophenol lactone from waste liquid produced by D-indophenol lactone production, comprising the following steps: A) subjecting the waste liquid from D-indophenol lactone production to polar solvent extraction and non-polar solvent extraction to obtain an extracted waste liquid; B) adding rare earth metal sulfate to the extracted waste liquid to induce crystallization, obtaining a mixture of neopentyl glycol and D-indophenol lactone; C) hydrolyzing the mixture first with an alkaline solution, and then extracting it with ethyl acetate; D) adding acid to the aqueous layer obtained from the extraction and then distilling under reduced pressure to obtain high-purity D-indophenol lactone, and concentrating the ethyl acetate layer obtained from the extraction in step C) to dryness to obtain neopentyl glycol. In this invention, rare earth sulfate is used in the crystallization stage to ensure that no metal salts or other impurities precipitate under low-temperature conditions, thus confirming that the precipitated crystals are a mixture of D-indophenol lactone and neopentyl glycol.
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