摘要
提出了从聚氨酯合成革生产废水中回收N,N-二甲基甲酰胺的节能新工艺。该工艺充分利用现有的低压蒸汽为热媒,在现有双塔回收工艺的基础上进行改进,由一级减压浓缩、二级常压浓缩、减压精馏三塔组成,热能循环使用,比现有双塔回收装置综合能耗下降37.7%,废水可以达到零排放,所得DMF产品的纯度99%以上。该工艺运行稳定,每套装置年收益达496.19万元。
A new three-column energy-saving technique to recover N,N-dimethylformamide（DMF）from the polyurethane （PU） synthetic leather process was developed by rebuilding a two-column recovery system. This process was composed of three columns, including first-stage vacuum concentration, second-stage atmospheric concentration, and vacuum distillation. Because heat energy was reused, the energy-saving recovery equipment could reduce energy consumption by 37.7%, compared to the current two-column equipment. No waster water was discharged in the process, and the purity of DMF product was above 99%. The profit of each energy-saving unitt could reach 4 961 900 yuan each year.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2007年第9期1347-1350,共4页
Chemical Industry and Engineering Progress
基金
浙江省科技厅重大科技专项(2006C13072)
关键词
N
N-二甲基甲酰胺
PU革
回收
节能
N, N-dimethylformamide
PU synthetic leather
recovery
energy-saving
