摘要 |
A method for preparing an oxydiphthalic anhydride comprises contacting, under reactive and substantially anhydrous conditions in a reactor, at least one halophthalic anhydride containing more than 250 ppm chlorophthalide impurity with a carbonate of the formula M2CO3, wherein M is an alkali metal, in the presence of a catalytic proportion of at least one phase transfer catalyst selected from the group consisting of hexaalkylguanidinium halides and alpha,omega- bis(pentaalkylguanidinium)alkane salts, phosphonium salts, phosphazenium salts, pyridinium salts, phosphazenium salts, ammonium salts, and combinations thereof. The phase transfer catalyst is present in a sufficient amount to prepare the oxydiphthalic anhydride when the chlorophthalide is present in an amount that is more than 250 ppm, and the oxydiphthalic anhydride is produced in a yield, based on the carbonate, of at least 70 %.
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申请人 |
SABIC INNOVATIVE PLASTICS IP B.V.;PRESSMAN, ERIC;KLOPPENBURG, LIOBA, MARIA;PENALVER, BERNABE, BEATRIZ;RAMESH, NARAYAN;ODLE, ROY, RAY;KUHLMAN, MATT;SINGH, HARPREET |
发明人 |
PRESSMAN, ERIC;KLOPPENBURG, LIOBA, MARIA;PENALVER, BERNABE, BEATRIZ;RAMESH, NARAYAN;ODLE, ROY, RAY;KUHLMAN, MATT;SINGH, HARPREET |