جداسازي كلرو استيك اسيدها از پساب شركت نيرو كلر يزد با روش‌هاي فيزيكي

Abstract In this thesis, an attempt has been made to investigate the possibility of separating valuable chemical compounds present in the wastewater of Nirou Chlor Yazd Company, especially monochloroacetic acid (MCA), using physical methods. due to the elimination of some steps such as hydrogenation, distillation, an‎d limitations in controlling the MCA production process, the final product includes by-products in addition to MCA. in the first step, 13C-NMR, H-NMR, an‎d differential pulse voltammetry methods were used to identify an‎d determine the compounds present in the wastewater. next, the crystallization process was eva‎luated as one of the key steps in the MCA production pathway. The aim was to identify the operating conditions an‎d the effects of compounds that can affect the formation, growth, an‎d separation of MCA crystals. next, various distillation methods have been eva‎luated, including simple distillation, fractional distillation, vacuum distillation an‎d extractive distillation. after the limited effectiveness of conventional distillation in removing wastewater components an‎d the recognition of the existence of stable equilibria an‎d the need for external agent to change these equilibria, extractive distillation was pursued. in this study, various agents such trioctylphosphine oxide, 18-crown-6, tributyl phosphate, ethylene glycol, diethylene glycol, polyethylene glycol, sodium lauryl ether sulfate, diethylene glycol monoethyl ether, dibutyl ether an‎d amine hydroxide were tested as additive (extractant) agents with the aim of changing the equilibria between wastewater components an‎d making it possible to separate the components by distillation. the results showed that using appropriate additives can separate more than 90% by weight of HOAc present in the wastewater an‎d more than 50% by weight of MCA present in the wastewater with a purity higher than 90%. With this method, at least 40% by weight of the total wastewater is recovered an‎d the rest is simplified. as a result, four agents trioctylphosphine oxide (TOPO), sodium lauryl ether sulfate (SLES), diethylene glycol monoethyl ether (DEGEE) an‎d tributyl phosphate (TBP) were introduced as effective agents for this process an‎d were examined in terms of performance, reusability over successive cycles an‎d ease of access. in this regard, the reusability effective agents include TOPO an‎d DEGEE, an‎d the non-reusable effective agents include SLES an‎d TBP.

3

154564