Process for purifying impure diphenols
First Claim
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1. A process for purifying impure p,p'"'"' -diphenols which comprises dispersing the impure diphenol in water, heating the resulting slurry, adding a water soluble polar, aprotic co-solvent until the dissolution or near dissolution of the diphenol slurry results at or near the boiling point of water or the solvent system, cooling the solution to achieve the separation of the purified diphenol and recovering the purified p,p'"'"' -diphenol.
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Abstract
A process for improving the quality of diphenols by recrystallization from aqueous solvent systems.
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12 Claims
- 1. A process for purifying impure p,p'"'"' -diphenols which comprises dispersing the impure diphenol in water, heating the resulting slurry, adding a water soluble polar, aprotic co-solvent until the dissolution or near dissolution of the diphenol slurry results at or near the boiling point of water or the solvent system, cooling the solution to achieve the separation of the purified diphenol and recovering the purified p,p'"'"' -diphenol.
- 7. A process for purifying impure p,p'"'"' -diphenols which comprises dispersing the impure diphenol in a mixture of water and a water soluble polar, aprotic co-solvent or mixtures of co-solvents, heating the resultant slurry until the dissolution or near dissolution is achieved, cooling the solution to achieve the separation of the purified diphenol and recovering the purified p,p'"'"' -diphenol.
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