微通道耦合反渗透膜串联处理甲醇制烯烃废水工艺优化  

Optimization of micro-channel coupled reverse osmosis membrane series treatment of methanol to olefin wastewater

作　　者：周渝 夏太阳 韦奇 唐甜 田磊 ZHOU Yu;XIA Taiyang;WEI Qi;TANG Tian;TIAN Lei(Equipment and Engineering Division,Shaanxi Research Institute of Chemical Industry Co.,Ltd.,Xi’an 710061,Shaanxi,China;School of Mechanical and Power Engineering,East China University of Technology,Shanghai 200237,China)

机构地区：[1]陕西化工研究院有限公司装备与工程事业部,陕西西安710061 [2]华东理工大学机械与动力工程学院,上海200237

出　　处：《化工进展》2024年第S01期43-51,共9页Chemical Industry and Engineering Progress

摘　　要：根据甲醇制烯烃(MTO)工艺特点,在甲醇制烯烃反应产物中,约56%(质量分数)是水,是全厂水平衡的重要环节,也是全厂污水处理单元的主要来源,现阶段国内MTO装置产水均排至污水处理单元进行处理。若能回收利用这部分水,能极大降低煤化工的单位产品水耗。传统的单一分离技术无法满足对水中无机催化剂颗粒及反应副产有机物的协同去除,随着环保要求的日益提高,多物理分离技术协同越来越多地应用于废水处理中。本文工作以现场实验为基础,提出了一种微通道耦合反渗透膜串联处理甲醇制烯烃废水工艺,实现废水的深度处理及回用。长周期实验表明,MTO净化水经处理后的水样平均浊度由24.55NTU降低至0.57NTU,平均COD由进口的521mg/L降低至58.7mg/L,分离净化效果明显;MTO外排净化水使用串联工艺处理后,单套MTO装置预计每年废水减排111.5万吨,节省电耗1.79×10^(5)kW·h,节约生产费用1706.4万元。该工艺具有投资少、耗能低、处理效率高及操作简便、吸附介质及膜可反洗再生、运行平稳等特点,有效解决了甲醇制烯烃工艺中净化水回用难、排放难的问题,对改善水资源、实现绿色化工的目标有重要意义。According to the characteristics of the methanol to olefins(MTO)process,about 56%(wt)of the reaction products are water,which is an important link in the water balance of the entire plant and the main source of the sewage treatment unit.At present,the water produced by domestic MTO units is discharged to the sewage treatment unit for treatment.If this part of water can be recycled and reused,it can greatly reduce the water consumption per unit product of coal chemical industry.The traditional single separation technology cannot meet the synergistic removal of inorganic catalyst particles and reaction by-products in water.With the increasing demand for environmental protection,multi physics separation technology is increasingly being applied in the wastewater treatment.This work was based on on-site experiments and proposed a microchannel coupled reverse osmosis membrane series treatment process for methanol to olefin wastewater,achieving deep treatment and reuse of the wastewater.Long term experiments showed that the average turbidity of MTO purified water samples after treatment decreased from 24.55NTU to 0.57NTU,and the average COD decreased from the imported 521mg/L to 58.7mg/L.The separation and purification effect was significant.After using a series process to treat the purified water discharged by MTO,a single MTO unit was expected to reduce wastewater emissions by 1.115 million tons per year,save energy consumption of 1.79×10^(5)kW·h,and save production costs of 17.064 million yuan.This process had the characteristics of low investment,low energy consumption,high treatment efficiency,easy operation,reversible regeneration of adsorption medium and membrane,and stable operation.It effectively solved the problems of difficult reuse and discharge of purified water in methanol to olefin process,and was of great significance for improving water resources and achieving green chemical industry.

关 键 词：微通道分离 反渗透膜分离 甲醇制烯烃废水 工艺优化 现场实验 

分 类 号：X703[环境科学与工程—环境工程] TQ221[化学工程—有机化工]