膜科学与技术

位置：首页 >> 期刊内容阅读

氨碱法制碱中基于直接接触膜蒸馏原理的膜吸收氨回用技术

作者：孙伟，高启君，吕晓龙，陈华艳，武春瑞，王暄，贾悦

单位：天津工业大学，生物化工研究所，省部共建分离膜与膜过程国家重点实验室，天津 300387

关键词：膜吸收；直接接触膜蒸馏；氨回用；含水率；氨碱法制碱

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2016,36(3):118-123

摘要：

氨碱法制碱中，为回收氨，氨冷却塔产生的冷凝氨液需经二次蒸氨工序，因此过程能耗高；循环回用的高含水率氨，降低了氨化工序中精盐水的浓度，最终限制了钠利用率的提高。本文采用精盐水作为吸收液，研究基于直接接触膜蒸馏原理的膜吸收氨回用技术。将模拟冷凝氨液中的氨转移到精盐水中而被吸收，同时抑制与氨传质同向的水传质过程，从而降低回用氨的含水率，节省水的汽化相变热。实验研究了膜吸收组件用聚偏氟乙烯（PVDF）中空纤维疏水膜丝内径ri和组件装填密度δ、吸收液与原料液进入膜组件时的温度差△T对膜吸收氨回用过程性能的影响。当ri为0.80mm，δ为16.8%，△T为9℃时，氨通量为1.17 kg•m-2•h-1，水通量仅为0.04 kg•m-2•h-1，表明该技术具有可行性。

In the process of ammonia soda, the condensate produced by ammonia cooling tower is usually distilled into the ammonia distillation tower again in order to recover ammonia, which increases the energy consumption. Ammonia with high water content was reused in ammoniating process, which decreases the concentration of refined brine, thus preventing sodium utilization rate from enhancing. In the paper, refined brine is used as absorbent. Membrane absorption（MA）technology to recover and reuse ammonia based on the principle of direct contact membrane distillation (DCMD) is studied. Ammonia in simulated condensed ammonia solution is transferred to refined brine, at the same time, mass transfer of water vapor whose direction of mass transfer is the same as ammonia is inhibited. So the rate of water content of ammonia recovered and reused is reduced and heat of phase transition produced by vaporization of water is saved. The influence of internal diameter (ri) of PVDF hollow fiber hydrophobic membrane used in the MA module, packing density (δ) of module and the temperature difference (△T) of absorbent and feed between inlet of shell and that of tube on the performance of MA to recover and reuse ammonia is studied experimentally. When ri is 0.80mm, δ is 16.8%, and △T is 9℃, the fiux of ammonia is 1.17 kg•m-2•h-1 and the fiux of water is only 0.04 kg•m-2•h-1, indicating that the technology is feasible.

基金项目：

作者简介：

第一作者简介：孙伟（1988-）男，河南鹤壁市人，硕士生，从事新型膜吸收过程研究. *通讯作者，E-mail：gqj2005@aliyun.com；luxiaolong@263.com

参考文献：

[1] Steinhauser G. Cleaner production in the Solvay Process: general strategies and recent developments[J]. Journal of Cleaner Production, 2008, 16(7): 833-841.
[2] Li Y, Song X, Chen G, et al. Preparation of calcium carbonate and hydrogen chloride from distiller waste based on reactive extraction-crystallization process[J]. Chemical Engineering Journal, 2014, 278: 55-61.
[3] 大连化工研究设计院. 纯碱工学[M]. 2版. 北京: 化学工业出版社, 2003.
[4] Tan X, Tan S P, Teo W K, et al. Polyvinylidene fluoride (PVDF) hollow fibre membranes for ammonia removal from water[J]. Journal of Membrane Science, 2006, 271(1): 59-68.
[5] 唐娜, 曹莎, 熊清华. 溴水的膜吸收性能研究[J]. 膜科学与技术, 2012, 01: 79-85.
[6] 李玲, 王冠平, 施汉昌. 膜吸收法应用于氨氮废水净化的研究[J]. 膜科学与技术, 2006, 03: 74-78.
[7] Plaza A, Romero J, Silva W, et al. Extraction and quantification of SO2 content in wines using a hollow fiber contactor[J]. Food Science and Technology International, 2014, 20(7): 501-510.
[8] Zhang P Y, Xu Z L, Ma X H, et al. Fabrication and characterization of PVDF hollow fiber membranes employing in-situ self-assembly modulation concept[J]. Journal of Membrane Science, 2015, 486: 119-131.
[9] Mokhtar N M, Lau W J, Ismail A F. Effect of feed temperature on the DCMD performances in treating synthetic textile wastewater[J]. Advanced Materials Research, 2015, 1113: 776-781.
[10] 郝卓莉, 王冠平, 朱振中, 等. 渗透膜蒸馏对液/液膜吸收过程的影响[J]. 膜科学与技术, 2004, 06: 5-9.
[11] Koonaphapdeelert S, Wu Z, Li K. Carbon dioxide stripping in ceramic hollow fiber membrane contactors[J]. Chemical Engineering Science, 2009, 64(1): 1-8.
[12] 高启君, 吴丹, 武春瑞, 等. 膜鼓气/吸收法连续脱溴过程[J]. 化工学报, 2011, 62(10): 2791-2796.
[13] 韩怀远. RO浓水浓缩及耦合热泵的膜蒸馏过程研究[D]. 天津：天津工业大学, 2010：21-25.

服务与反馈：

【文章下载】【加入收藏】

《膜科学与技术》编辑部地址：北京市朝阳区北三环东路19号蓝星大厦邮政编码：100029 电话：010-64426130/64433466 传真：010-80485372邮箱：mkxyjs@163.com