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    • 14. 发明授权
    • Method for preparing stable, liquid tetrahydrophthalic anhydride for use
in preparing polyesters
    • 制备用于制备聚酯的稳定的液体四氢邻苯二甲酸酐的方法
    • US4203905A
    • 1980-05-20
    • US934505
    • 1978-08-17
    • Marvin Z. Woskow
    • Marvin Z. Woskow
    • C07C51/50C07D317/64C07D307/24
    • C07D317/64C07C51/50
    • Tetrahydrophthalic anhydride for the preparation of polyesters is conveniently prepared in a stable, liquid form for transportation and storage by adding molten anhydride to a 100.degree. to 120.degree. C., C.sub.2 to C.sub.9 glycol at rate to maintain this temperature range without raising the temperature of the mixture in increments of more than 5.degree. F., reacting the mixture for a sufficient time to reduce the acid number of the mixture to a number in the range below the theoretical acid number for the half ester of the glycol and anhydride and 165; thereafter cooling the mixture to 155.degree. C., adding glycol as necessary to provide a mole ratio of glycol to anhydride in the range of 1.2 to 2:1 and cooling the mixture to a temperature in the range of 40.degree. to 70.degree. C.
    • 用于制备聚酯的四氢邻苯二甲酸酐方便地以稳定的液体形式制备,用于运输和储存,通过将熔融的酸酐加入到100-120℃,速率维持该温度范围而不升高温度 该混合物的增量大于5°F,使混合物反应足够的时间以将该混合物的酸值降低到低于二醇和酐的半酯的理论酸值的范围内且165; 然后将混合物冷却至155℃,根据需要加入乙二醇以使乙二醇与酐的摩尔比在1.2至2:1的范围内,并将该混合物冷却至40℃至70℃的温度。