Trimellitic anhydride and o-phthalic anhydride are the mainly by-products in the producing process of pyromellitic anhydride.

  • 均苯四甲酸二酐产品中主要含有偏苯三酸酐、苯酐等副产.

  • 互联网摘选 2025-01-19 09:18:08

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