614-90-4Relevant articles and documents
Process for the production of the toluene diisocyanate
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Page/Page column 5; 6, (2008/06/13)
The invention relates to a process for the production of toluene diisocyanate, in which the crude toluenediamine obtained from the hydrogenation is purified and then phosgenated. The purification step reduces the total amount of cyclic ketones to less than 0.1 % by weight, based on 100% by weight of the toluenediamine.