高浓度含酚废水的变压精馏分离过程研究  

Separation process of high-concentration-phenol-contained wastewater by pressure swing distillation method

作　　者：段振亚[1] 王磊[1] 苏海涛[1] 李韶璞 张俊梅[2] 

机构地区：[1]青岛科技大学机电工程学院,山东青岛266061 [2]青岛科技大学化工学院,山东青岛266061

出　　处：《化学工程》2016年第4期31-35,共5页Chemical Engineering(China)

基　　金：山东省高等学校科技计划项目(J12LD15)

摘　　要：为了实现高浓度含酚废水中的苯酚回收和减少含酚废水处理量,针对苯酚水二元共沸物系的压力敏感性,利用Aspen软件对高浓度含酚废水的变压精馏分离进行了可行性研究,并以全年总成本TAC为目标函数,采用序贯迭代法对苯酚水混合物的变压精馏分离过程进行了流程优化。当高压塔操作压力1 418.55 k Pa,理论板数61,进料位置30,循环物流进料位置15,回流比2.09,低压塔操作压力101.325 k Pa,理论板数7,进料位置6,回流比0.19时,苯酚回收率可达到99.1%,水纯度为99.9%,再经生化处理后就可直接排放。在此基础上,对热集成工艺在含酚废水变压精馏过程中的经济性进行了分析,结果表明:对于苯酚质量分数为10%的含酚废水的变压精馏过程,部分热集成工艺可降低能源消耗1 137 k W,节约运行成本$283 709,且部分热集成变压精馏比完全热集成变压精馏具有更低的运行成本。To recover the phenol from high-concentration-phenol-contained wastewater and reduce the treatment capacity of phenolic wastewater,the Aspen software was used in the feasibility study on wastewater separation process by pressure swing distillation method. The method fully utilized the pressure sensitive property of the binary system,was optimized by sequential iterative procedure based on minimum total annual cost of the separation process. The phenol recovery rate and water purity can reach 99. 1% and 99. 9% respectively in the high-pressure column of operation pressure 1 418. 55 k Pa,theoretical plates 61,raw material feed stage 30,circulatory stream feed stage 15,the reflux ratio 2. 09,and in the low-pressure column of operation pressure 101. 325 k Pa,theoretical plates 7,raw material feed stage 6,the reflux ratio 0. 19. The high-purity water can be discharged directly after the biochemical treatment. The economy of the heat integration process in the pressure swing distillation was analyzed based on the above results. The results show that partial heat integration process can reduce the energy consumption1 137 k W and save a cost of $ 283 709 in pressure swing distillation with 10% phenol in mass fraction. The partial heat integration process has lower cost than full heat integration in the pressure swing distillation.

关 键 词：含酚废水 变压精馏 全年总成本 模拟优化 

分 类 号：X783[环境科学与工程—环境工程] TQ028.31[化学工程]