NIJin-juan,CUIKang-ping,BAODa-li.Recovery of High Concentration Methylamine by Condensation, Two-stage Water Absorption, Atmospheric Distillation[J].China Water & Wastewater,2022,38(18):107-113.
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Recovery of High Concentration Methylamine by Condensation, Two-stage Water Absorption, Atmospheric Distillation

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第18期 Page: 107-113 Column: Date of publication: 2022-09-17
Author(s):
NI　Jin-juan1;  CUI　Kang-ping1;  BAO　Da-li1; 2
（1. School of Resources and Environmental Engineering， Hefei University of Technology， Hefei 230009， China； 2. Hefei Maoteng Environmental Protection Technology Co. Ltd.， Hefei 230000， China）
Keywords:
atmospheric distillation;  methylamine wastewater;  resource recovery;  biological treatment
Abstract:
High concentration methylamine formed during regeneration of N-methylformamide (NMF) containing stripper liquid is recovered by condensation, two-stage water absorption and atmospheric distillation. The sources of high concentration methylamine, the design and optimization of the recovery process, the composition of the recovery system, and the main equipment parameters are analyzed. The operation results show that the process has good effect on the resource utilization of high concentration methylamine produced in the recovery process of waste stripping solution containing NMF. The recovered product could stably meet the standard of 40% methylamine aqueous solution. The investment is low-cost by using the existing waste stripping solution recovery distillation equipment. Moreover, the recovery of methylamine has economic benefits. After methylamine recovery, the COD and NH3-N of the secondary wastewater was 3 000-6 000 mg/L and 20-50 mg/L, which met the influent conditions of hydrolytic acidification, UASB and two-stage A/O system of sewage treatment station.
Last Update: 2022-09-17