Process for producing 2, 3, 3′, 4′,-biphenyltetracarboxylic dianhydride
2,3,3′,4′-biphenyltetracarboxylic acid is heat-dehydrated in a molten state at a temperature not lower than 200° C. in a flow of an inert gas in a reactor having at least one reaction vessel by stirring the molten material to produce 2,3,3′,4′-biphenyltetracarboxylic dianhydride. Thus obtained 2,3,3...
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