The present invention relates to a multistep process for the preparation of organic diisocyanates by converting the corresponding diamine precursors, urea and hydroxy compounds into monomeric diurethanes, converting these diurethanes into diurethanes of high boiling hydroxy compounds, and finally cleavage of the latter diurethanes to form the diisocyanates and recover the high boiling hydroxy compounds.
本发明涉及一种多步骤工艺,用于通过将相应的二胺前体、
尿素和羟基化合物转化为单体二
脲醚,将这些二
脲醚转化为高沸点羟基化合物的二
脲醚,最后将这些二
脲醚裂解以形成二
异氰酸酯并回收高沸点羟基化合物。