Process for preparing rosin and colorless rosin comprising disproportionation and dehydrogenation
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United States of America Patent
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Mar 7, 1995
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N/A
app pub date -
Jul 26, 1994
filing date -
Dec 21, 1991
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Abstract
The present invention relates to a process for preparing a rosin ester, which comprises esterifying a purified product of a disproportionated rosin with an alcohol, and then subjecting the esterified rosin to dehydrogenation in the presence of a dehydrogenating catalyst, a process for preparing a rosin ester, which comprises heating a purified rosin and an alcohol in the presence of a disproportionating catalyst, simultaneously subjecting the resulting rosin to disproportionation and esterification, dehydrogenating the reactant in the presence of a dehydrogenating catalyst, and thereafter adding an organic phosphorus compound to the reaction system, a process for preparing a colorless rosin, which comprises simultaneously subjecting a purified rosin to disproportionation and dehydrogenation in the presence of a catalyst, and then adding an organic phosphorus compound to the reaction system and a process for preparing a colorless rosin, which comprises dehydrogenating a purified disproportionated rosin in the presence of a dehydrogenating catalyst. According to the present invention, rosin esters and colorless rosins which have remarkably improved various properties from the viewpoints of color tone, odor, stability and the like can be cheaply provided.
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