Patent
Purification of bisphenol-A
TLDR
The use of an inert liquid carrier for the adduct, such as acetone, facilitates the desired separation and purification of the bisphenol-A from the released phenol as discussed by the authors.Abstract:
Pure bisphenol-A can be obtained by subjecting the adduct of the latter and phenol to spray drying conditions and recovering the bisphenol-A from the released phenol. The use of an inert liquid carrier for the adduct, such as acetone, facilitates the desired separation and purification of the bisphenol-A.read more
Citations
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Patent
Process for preparing bisphenol A
TL;DR: In this article, a process for preparing high purity bisphenol A comprising feeding continuously phenol and acetone in the presence of a hydrochloric acid catalyst into a first stage reactor was described.
Patent
Purification of bisphenol-A
TL;DR: In this paper, a method for purifying bisphenol-A involving aqueous crystallization of impure bisphensol A followed by in-situ treatment of the water/bisphenols A crystal slurry with an organic washing solvent is presented.
Patent
Process for obtaining high purity bisphenol A
Glen R. Ladewig,Feng-Chih Chang +1 more
TL;DR: In this article, a method of purifying bisphenols by crystallizing the crude bis from a single liquid phase containing water, bis and an organic solvent, stripping the remaining mother liquor (containing the impurities) of solvent and water, and mixing it with phenol, contacting the mixture of phenol and mother liquor with a cation exchange resin to convert the impurity to the desired product.
Patent
Process for production of 2,2-bis(4-hydroxyphenyl) propane
TL;DR: A process for continuously producing 2,2-bis(4-hydroxyphenyl) propane having a high quality from a reaction of phenol and acetone in the presence of a hydrochloric acid containing catalyst is described in this article.
Patent
Countercurrent multi-stage water crystallization for aromatic compounds
Lanny A. Robbins,Gammill Ben B +1 more
TL;DR: In this article, a multi-stage countercurrent process for the purification of isopropylidenediphenol was proposed, where the crystals are melted by the addition of heat and water prior to each crystallization step and one crystallization is accomplished at a pre-selected low temperature.
References
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Patent
Crystallization of diphenylol alkanes
Walter H Prahl,Sol J Lederman +1 more
TL;DR: An unexpected marked increase in the solubility of a gem-diphenylol alkane at a temperature above near the atmospheric boiling point of a solvent selected from the group consisting of benzene, toluene, methylene chloride, ethylene dichloride, and trichloroethylene, enables a process for purifying the gem-dephenyll alkane as mentioned in this paper.
Patent
Process for the production of 2,2-(4,4{40 -dihydroxy-diphenyl)propane
TL;DR: In this paper, a process for the production of 2,2-(4,4'-dihydroxydiphenyl) propane comprising reacting phenol with acetone in a molar ratio of at least 2:1 but not exceeding 10:1 in the presence of an acidic agent was described.