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首页> 外文期刊>Separation and Purification Technology >tert-Butanol-water mixture separation by extractive distillation: Application of experimental data in process simulations
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tert-Butanol-water mixture separation by extractive distillation: Application of experimental data in process simulations

机译：通过萃取蒸馏分离叔丁醇 - 水混合物：在过程模拟中的应用实验数据

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摘要

Effect of two solvents on the tert-butanol-water azeotropic mixture separation efficiency and economy has been studied. As solvents, two imidazolium ionic liquids (ILs), namely 1-ethyl-3-methylimidazolium bromide [EMim]Br and 1-butyl-3-methylimidazolium bromide [BMim]Br, were selected. For the original diluted tert-butanol (TBA) mixture separation, a separation unit composed of pre-concentration and extractive distillation columns was proposed. Simulations of separation equipment were carried out based on the equilibrium stage model of a distillation column implemented in ASPEN+. Regarding phase equilibrium description, the original NRTL excess Gibbs energy equation was used for the components' activity coefficients calculation. Phase equilibrium data of IL containing binaries were measured experimentally in a broad range of ILs' concentrations and original binary parameters of the NRTL equation were evaluated from these data. To avoid ILs decomposition, regeneration of extraction solvents, ILs, in a vacuum film evaporator was considered. The effect of temperature and pressure in the vacuum film evaporator on the purity of the recovered ILs was tested experimentally in laboratory equipment and the results were applied in separation unit design simulations. For the proposed separation unit, operation costs were evaluated using the ASPEN+ software. Influence of the state of feed entering the extractive distillation column on operation costs was also investigated. By replacing the total condenser at the pre-concentration column head for a partial one, overall operation costs of the separation unit were reduced by about 20%.
机译：研究了两种溶剂对叔丁醇 - 水共沸混合物分离效率和经济的影响。作为溶剂，选择了两种咪唑鎓离子液体（ILS），即1-乙基-3-甲基咪唑溴吡啶鎓溴化物[emim] Br和1-丁基-3-甲基咪唑溴α[Bmim] Br。对于原始稀释的叔丁醇（TBA）混合物分离，提出了由预浓缩和萃取蒸馏塔组成的分离单元。基于在Aspen +中实施的蒸馏塔的平衡阶段模型进行分离设备的模拟。关于相平衡描述，原始NRTL过量的GIBBS能量方程用于组件的活动系数计算。通过实验在广泛的ILS的浓度下测量含有二进制型的相平衡数据，并从这些数据评估NRTL方程的原始二进制参数。为了避免ILS分解，考虑了萃取溶剂的再生，真空膜蒸发器中的萃取溶剂ILS。实验在实验室设备中测试了真空膜蒸发器中的温度和压力对回收的ILS纯度的影响，并在分离单元设计模拟中施加结果。对于所提出的分离单元，使用ASPEN +软件评估运营成本。还研究了进料进入蒸馏塔对运营成本的影响。通过更换浓度柱头的总电容器，分离单元的整体运营成本降低约20％。

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