AN ECO-FRIENDLY METHOD OF PREPARATION OF HIGH PURITY TETRABROMOBISPHENOL-A

This invention relates to an Eco-friendly method of preparation of high purity tetrabromobisphenol-A through the bromination of bisphenol-A (BPA) with a combination of bromide and bromate ions in organic solvent and water, reacting bromide salt of alkali or alkaline earth metal/hydrobromic acid and...

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Bibliographische Detailangaben
Hauptverfasser:	RAMACHANDRAIAH, GADDE, RAJESH, POPATLAL, PANDYA, VAGHELA, SANJAY SHAMBHUBHAI, GHOSH, PUSHPITO, KUMAR, MEHTA, ADITYA, SHANTILAL, JETHVA, ASHOK DAHYABHAI, MISRA, SUDHINDRA, NATH
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY METALLURGY ORGANIC CHEMISTRY
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Beschreibung
Zusammenfassung:	This invention relates to an Eco-friendly method of preparation of high purity tetrabromobisphenol-A through the bromination of bisphenol-A (BPA) with a combination of bromide and bromate ions in organic solvent and water, reacting bromide salt of alkali or alkaline earth metal/hydrobromic acid and bromate as alkali/alkaline earth metal salt, optionally adding 12 N hydrochloric acid in case of metal bromide or equivalents in case of hydrobromic acid, adding alkyl sulfate salts having C6-C18 carbon chain as a surfactant at 5 to 45 DEG C over a period of 4 to 5 h under stirring, separating the crystalline (50-70 %) product; washing and drying of the product at 100 DEG C, and charging the organic layer containing un-reacted bisphenol-A, mono-, di- and tri-bromo derivatives and TBBPA with additional bisphenol-A and repeating the above process to yield 95-100 % of TBBPA in the subsequent batches.