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US 6,271,424 B1Granted
Process for the purification of monotertiarybutyl hydroquinone
AssigneeEastman Chemical Company
InventorsPhillip Montgomery Hudnall, Lucian Boldea
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AssigneeEastman Chemical Company
InventorsPhillip Montgomery Hudnall, Lucian Boldea
Estimating the term…
The present invention relates to a method of making purified monotertiarybutyl hydroquinone containing less than 0.2% (wt.) of 2,5 ditertiarybutyl hydroquinone. This method includes heating a composition of monotertiarybutyl hydroquinone and 2,5 ditertiarybutyl hydroquinone in a solvent mixture of a polar solvent and a non-polar solvent. During this step, the non-polar solvent is substantially stripped-off and at least part of the 2,5 ditertiarybutyl hydroquinone is solidified, which is separated from the non-solidified composition. The remaining non-solidified composition and polar solvent are mixed with a non-polar solvent of the same type as was previously stripped-off. The polar solvent, which contains the purified monotertiarybutyl hydroquinone, is separated from the non-polar solvent. This purified monotertiarybutyl hydroquinone is separated the from the polar solvent to produce purified monotertiarybutyl hydroquinone containing less than 0.2% (wt.) of 2,5 ditertiarybutyl hydroquinone.
A method of making purified monotertiarybutyl hydroquinone comprising less than 0.2% (wt.) of 2,5 ditertiarybutyl hydroquinone, wherein the method comprises:
A method of making purified monotertiarybutyl hydroquinone comprising less than 0.2% (wt.) of 2,5 ditertiarybutyl hydroquinone, wherein the method comprises:
A method of making purified monotertiarybutyl hydroquinone comprising less than 0.2% (wt.) of 2,5 ditertiarybutyl hydroquinone, wherein the method comprises:
Dependencies are inferred from the claim text.