Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1983-04-15
1985-04-09
Helfin, Bernard
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568 33, 568641, C07C 4136, C07C 4116, C07C 43275, C08G 6530
Patent
active
045103348
ABSTRACT:
In a method for the removal of alkali halides by washing them out of reaction products prepared, in the presence of ketones which form a miscibility gap with water, by a reaction of xylylene dichlorides and/or bromides with bisphenols in the presence of alkaline compounds or in the form of alkali salts, at 85.degree. to 160.degree. C., with the addition in some cases of terminal-group-closing monophenols or monohalogen alkyl compounds, water or a water-ketone mixture solvent is added to the reaction mixture before beginning the filtration, and afterward is recycled. For the complete recovery of the ketones and alkali halides and the reuse of the ketones with reduced energy consumption a kentonous phase and an aqueous phase are recovered by separate evaporation after the separation of the filtrate in two liquid phases, both of the condensates are combined to a ketone-water mixture, the filter cake is stirred up again in the ketone-water mixture and filtered a second time.
REFERENCES:
patent: 4371709 (1983-02-01), Steffen et al.
Glembin Dirk
Huhn Kurt
Meyer Gunter
Thallmeier Manfred
Dynamit Nobel Aktiengesellschaft
Helfin Bernard
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