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US07994361B2 Moderate-pressure gas phase phosgenation 有权
中等压力气相光气化

Moderate-pressure gas phase phosgenation
摘要:
The invention relates to a process for preparing aromatic diisocyanates by reaction of phosgene with diamines in the gas phase, in which the reaction is carried out in a reaction zone at moderate pressures, i.e. the pressure in this reaction zone is more than 3 bar and less than 20 bar.
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