Process for the preparation of bisphenol bischlorocarbonic acid esters
First Claim
1. A continuous process for the preparation of a bisphenol bischlorocarbonic acid ester which comprises reacting a hydroxy compound which is a hydroquinone or an aromatic dihydroxy compound of the formula ##SPC3##wherein X is alkylene, alkylidene, cycloalkylene, cycloalkylidene, O, S, SO2 or ##SPC4##and R1 and R2, which may be the same or different, are each alkyl, chlorine or bromine, said hydroxy compound being dissolved in excess alkali metal hydroxide solution as the sole acid binding agent, with from 2.5 to 5.0 mol, per mol hydroxy compound, of phosgene which is dissolved in a solvent for the bischlorocarbonic acid ester formed in the reaction, at a pH of above 12 and at a temperature of from 0°
- to 50°
C. under vigorous mixing of the reactants and uni-directional flow conditions, separating the organic layer thus obtained and isolating the bisphenol bischlorocarbonic acid ester therefrom by distillation, crystallization or a combination thereof.
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Abstract
A continuous process for the preparation of a bisphenol bischlorocarbonic acid ester, wherein a hydroquinone or a bisphenol dissolved in excess alkali metal hydroxide solution is reacted with 2.5 to 5.0 mol of phosgene (per mol of the dihydroxy compound) which is dissolved in a suitable solvent for the bischlorocarbonic acid ester formed in the reaction at a pH value of at least 12 and a temperature of 0° to 50°C under vigorous mixing of the reactants and unidirectional flow conditions and the organic layer thus obtained is separated wherefrom the bisphenol bischlorocarbonic acid ester is isolated by distillation and/or crystallization.
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Citations
9 Claims
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1. A continuous process for the preparation of a bisphenol bischlorocarbonic acid ester which comprises reacting a hydroxy compound which is a hydroquinone or an aromatic dihydroxy compound of the formula ##SPC3##
wherein X is alkylene, alkylidene, cycloalkylene, cycloalkylidene, O, S, SO2 or ##SPC4## and R1 and R2, which may be the same or different, are each alkyl, chlorine or bromine, said hydroxy compound being dissolved in excess alkali metal hydroxide solution as the sole acid binding agent, with from 2.5 to 5.0 mol, per mol hydroxy compound, of phosgene which is dissolved in a solvent for the bischlorocarbonic acid ester formed in the reaction, at a pH of above 12 and at a temperature of from 0° - to 50°
C. under vigorous mixing of the reactants and uni-directional flow conditions, separating the organic layer thus obtained and isolating the bisphenol bischlorocarbonic acid ester therefrom by distillation, crystallization or a combination thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- to 50°
Specification