但在生产中要妥善解决尿素浓溶液易结晶堵塞管道以及尿素在高温下易生成缩二脲的问题。
However these troubles of concentrated urea liquor crystallizing and blocking pipe, as well as urea changing into biuret at high temperature should be avoided.
三聚氰胺、尿素与甲醛经羟甲基化、醚化反应，生成甲醚化六羟甲基三聚氰胺和甲醚化羟甲基脲复合树脂胶。
Melamine, urea and formaldehyde underwent hydroxymethylation and etherification to yield a composed resin glue of methyl-etherified hexahydroxy methylmelamine and methyl-etherified hydroxymethylurea.
本文概述了胺硝基物选择氧化还原羰基化生成脲的新工艺路线。
A new process for the synthesis of ureas based on the selective REDOX carbonylation of amine and nitro compounds was described.
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