| 摘要 |
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 from the polar solvent to produce purified monotertiarybutyl hydroquinone containing less than 0.2 % (wt.) of 2,5 ditertiarybutyl hydroquinone. |
