【作者】 陈辉；

【导师】 窦梅；

【作者基本信息】 浙江大学 ， 化学工程（专业学位）， 2012， 硕士

【摘要】 生产环氧树脂过程中产生的废水具有高有机物浓度、高含盐量、废水排放量大的特点,废水难处理性是制约环氧树脂工业发展的主要关键所在。本文针对环氧树脂废水高盐高有机含量的特点提出采用萃取结晶法处理环氧树脂废水。为此本文测定了一些低级脂肪醇-水-甘油-NaCl四元饱和溶液在不同温度下的液液平衡数据。这些低级脂肪醇包括异丙醇、叔丁醇和正丁醇。得到了各温度下体系的无盐液液平衡相图以及两相中NaCl的溶解度曲线。结果表明叔丁醇和正丁醇作为溶剂,可使有机相中的盐呈幂级数减溶,并使盐含量降至0.5%以下。平衡数据的可靠性用Eissen-Joffe经验方程来验证。并且利用正丁醇-水-甘油-NaCl四元饱和溶液平衡数据拟合出NRTL的二元交互作用参数。参数的估计采用Nelder和Mead提出的单纯形法。在此基础上,对萃取结晶法处理环氧树脂废水的工艺进行了概念设计。利用有机相中含盐极低,又能提取甘油的特点,建立从有机相中回收甘油的流程。采用叔丁醇和正丁醇为溶剂,运用ASPEN Plus软件进行模拟核算溶剂用量及能耗。结果表明以叔丁醇做溶剂处理废水回收的甘油及NaCl均高于以正丁醇做溶剂处理废水的方法,但叔丁醇的回收需要加入环已烷作为浃带剂,产生了额外的处理费用,因此选择正丁醇比选择叔丁醇更佳。在所考察的溶剂比范围中,当正丁醇溶剂比为1.5时,能耗为8250KJ/kg废水,且单级萃取甘油回收率可以达到25%。更多还原

【Abstract】 Wastewater with high salinity and high organic compounds concentration drained from epoxy resin industry was considered to hinder the development of epoxy resin. In this work, the treatment of epoxy resin wastewater by extractive crystallization was proposed and investigated.For this purpose, Liquid-liquid equilibria (LLE) for saturated aqueous solution of glycerol+1-butanol+water+NaCl were measured at303.15K,323.15K and343.15K under atmosphere pressure using a static method, as well as saturated aqueous solution of glycerol+2-propanol+water+NaCl at273.15K,283.15K,303.15K and saturated aqueous solution of glycerol+tert-butanol+water+NaCl at283.15K,303.15K,323.15K. All the LLE data followed the Eisen-Joffe equation. The experimental data were also correlated with the NRTL model. New thermodynamic interaction parameters for1-butanol, water, NaCl versus glycerol were estimated with the Simplex method and the Maximum Likelihood principle. The results were satisfactory in accordance with root mean square deviations between experimental and calculated compositions, which were below2.2%.Furthermore, the flowsheet of the wastewater treatment by extractive crystallization was designed and simulated. The results showed that the energy consumption using tert-butanol as solvent is as2times large as using1-butanol. The energy consumption treating per kg wastewater feed is8250KJ, when the solvent ratio is1.5using1-butanol as the solvent. And the recovery ratio of glycerol is able to reach25%by single extraction.更多还原