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    • 10. 发明申请
    • METHOD FOR PURIFYING DIANHYDRIDES
    • 纯化二氢呋喃的方法
    • US20080319210A1
    • 2008-12-25
    • US12202529
    • 2008-09-02
    • Albert Santo StellaDavid Bruce Hall
    • Albert Santo StellaDavid Bruce Hall
    • C07D405/12
    • C07D407/12
    • A method for purifying dianhydrides is provided. In one aspect, purified oxybisphthalic anhydrides, intermediates useful in the preparation of polyetherimides are provided. In one embodiment, a first solution containing a dianhydride compound, a solvent, and a phase transfer catalyst is contacted with a solid inorganic adsorbent material having a total pore volume of about 0.5 milliliters/gram or greater and a cumulative pore volume distribution of about 20 percent or greater of particles having a pore diameter in a range between about 3 nanometers and about 20 nanometers. The solution containing the dianhydride compound is then separated from the solid inorganic adsorbent material to provide a purified dianhydride compound which is substantially free of the phase transfer catalyst. The purification technique is especially valuable for preparing high purity oxybisphthalic anhydrides, such as 4,4′-oxybisphthalic anhydride (4,4′-ODPA), which are substantially free of residual phase transfer catalyst.
    • 提供了一种纯化二酸酐的方法。 在一个方面,提供了纯的氧化双邻苯二甲酸酐,可用于制备聚醚酰亚胺的中间体。 在一个实施方案中,将含有二酐化合物,溶剂和相转移催化剂的第一溶液与总孔体积为约0.5毫升/克或更大并且累积孔体积分布约为20的固体无机吸附材料接触 百分比或更大的具有在约3纳米和约20纳米之间的孔径的颗粒。 然后将含有二酐化合物的溶液与固体无机吸附材料分离,得到基本上不含相转移催化剂的纯化二酐化合物。 纯化技术对于制备基本上不含残余相转移催化剂的4,4'-氧双苯二甲酸酐(4,4'-ODPA)的高纯度羟基双苯酐具有特别的价值。