Purification of quinones
AssigneeEastman Kodak Company
InventorsYeong-Jen Kuo, Michael Bellas
Life of this patent
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Abstract
Disclosed is a process for removing chlorine-containing impurities from quinone compounds such as p-bezonquinone. The process involves extracting a quinone compound containing 1000 ppm or more chlorine with heptane, cyclohexane or a mixture thereof and separating the quinone compound from the extraction mixture. The process provides a means for obtaining quinone compounds containing 50 ppm or less chlorine.
Claims3
Process for obtaining a quinone compound containing less than 50 ppm chlorine which comprises the steps of:
- (1) intimately contacting a quinone compound containing at least 1000 ppm chlorine with heptane, cyclohexane or a mixture thereof at elevated temperature;
- and
- (2) separating the quinone compound from the mixture of step (1) to obtain the quinone compound containing less than 50 ppm chlorine.
Process for obtaining p-benzoquinone containing less than 20 ppm chlorine which comprises the steps of:
- (1) intimately contacting p-benzoquinone containing at least 1000 ppm chlorine with heptane, cyclohexane or a mixture thereof at a temperature of about 80.degree. to 130.degree. C. wherein the weight ratio of the heptane, cyclohexane or mixture thereof to p-benzoquinone is about 1 5:1 to 5:1;
- and
- (2) separating p-benzoquinone from the mixture of step (1) to obtain p-benzoquinone containing less than 20 ppm chlorine.
Dependencies are inferred from the claim text.