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US 6,586,637 B2Granted
Process for producing bisphenol A
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorMasahiro Iwahara
Life of this patent
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Abstract
Acetone and phenol are reacted in the presence of an acid-type ion exchange resin. The reaction mixture obtained from the reaction is subjected to a reduced-pressure distillation to recover bisphenol A as a fraction discharged from the bottom of a distillation column. Before the reaction, the acid-type ion exchange resin is washed with phenol to produce a phenol solution. The phenol solution is distilled together with a fraction obtained from the top of a distillation column. The bisphenol A produced in the process exhibits a stable hue.
Claims20
A process comprising,
- reacting acetone with phenol in the presence of an acid-type ion exchange resin to form a reaction mixture and then
- subjecting the reaction mixture to a reduced-pressure distillation to recover bisphenol A from a fraction discharged from the bottom of a first distillation column,
- wherein said acid-type ion exchange resin is washed with phenol before the reaction to form a phenol solution;
- and
- the phenol solution is mixed with a fraction obtained from the top of a second distillation column and distilled to form recovered phenol,
- wherein the first and second distillation columns may be the same or different.
3 more elements
Dependencies are inferred from the claim text.