Low-concentration DMF wastewater treatment system by distillation method with multiple intermediate heat exchangers

• Main Authors: ZHU BIYUN, GAO XIAOXIN, HUANG ZE'EN, MA JIANGQUAN, YANG DEMING
• Format: Patent
• Language: Chinese; English
• Published: 31.05.2017
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention relates to a low-concentration DMF wastewater treatment system by a distillation method with multiple intermediate heat exchangers. The system comprises a raw material preheater, a normal-pressure rectification tower, a plurality of intermediate reboilers, an overhead condenser and a tower kettle reboiler, wherein DMF wastewater is preheated to a bubble point in the preheater and is separated in the rectification tower. According to the system, consumption of high-grade steam can be reduced by adopting the plurality of intermediate reboilers, and the material extracted from the side line of an intermediate plate is heated by steam having a relatively low energy grade, so that the consumption of steam at the tower bottom can be saved, and the thermodynamic efficiency of a separation system can be improved. Compared with a traditional rectification method, the system has the advantage that the thermodynamic efficiency can be increased by over 39 percent. 本发明涉及种带多个中间换热器精馏法处理低浓度DMF废水系统，该系统包括原料预热器、常压