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首页> 外文期刊>Separation and Purification Technology >Comparative study on regenerating sodium hydroxide from the spent caustic by bipolar membrane electrodialysis (BMED) and electro-electrodialysis (EED)
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Comparative study on regenerating sodium hydroxide from the spent caustic by bipolar membrane electrodialysis (BMED) and electro-electrodialysis (EED)

机译：双极膜电渗析（BMED）和电渗析（EED）从废碱中再生氢氧化钠的比较研究

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摘要

Sodium hydroxide has been widely used in removing acidic compounds from crude oil and natural gas or their fractions during the production of petrochemical industry. This must leads to the generation of a large amount of spent caustic. In previous paper, BMED was used to regenerate sodium hydroxide (NaOH) from spent caustic. To find the variety of that regeneration process, the reclamation of sodium hydroxide by using electro-electrodialysis (EED) were performed. The influences of current density and initial base concentration on regeneration process were analyzed. In comparison, BMED has higher base yield and current efficiency. However, its process cost is higher than that of EED due to the extra expenditure for its tank, pumps and bipolar membrane. The process cost is estimated to be 0.97 $/kg NaOH for BMED and 0.86 $/kg NaOH for EED. However, BMED will be more economically attractive as the price of bipolar membrane decreases, and has more environmental benefits by prevention secondary pollution.
机译：氢氧化钠已被广泛用于在石油化学工业生产中从原油和天然气或其馏分中除去酸性化合物。这必须导致大量废碱的产生。在以前的论文中，使用BMED从废碱中再生氢氧化钠（NaOH）。为了发现该再生过程的多样性，使用电渗析（EED）进行了氢氧化钠的回收。分析了电流密度和初始碱浓度对再生过程的影响。相比之下，BMED具有更高的基本产率和电流效率。但是，由于其水箱，泵和双极膜的额外支出，其处理成本高于EED。 BMED的工艺成本估计为0.97 $ / kg NaOH，EED的工艺成本估计为0.86 $ / kg NaOH。但是，随着双极膜价格的下降，BMED将在经济上更具吸引力，并且通过预防二次污染将具有更大的环境效益。

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