-
公开(公告)号:US20150352498A1
公开(公告)日:2015-12-10
申请号:US14422161
申请日:2012-08-16
申请人: Ahilan RAMAN
发明人: Ahilan RAMAN
CPC分类号: B01D61/58 , B01D61/025 , B01D61/027 , B01D61/422 , B01D61/44 , B01D2311/08 , B01D2311/25 , B01D2311/2623 , B01D2311/2642 , B01D2317/022 , B01D2317/025 , C01D3/14 , C25B1/14 , C25B1/46 , C25B9/08 , C25B15/08 , B01D2311/04
摘要: The invention provides a process and system for producing sodium chloride brine suitable for use in a sodium hydroxide production plant having a chlor-alkali membrane cell, said process comprising (a) nanofiltering feed water containing dissolved sodium chloride to produce a permeate and a retentate, wherein the retentate comprises at least 85% of any divalent ions from the feed water; and (b) purifying the permeate to produce the sodium chloride brine suitable for use in a sodium hydroxide production plant having a chlor-alkali membrane cell, wherein step (b) comprises electrodialyzing the permeate to produce a concentrate having a greater concentration of total dissolved salts and a smaller proportion of divalent ions than the permeate and a diluent comprising water and divalent ions separated from the permeate. The invention also provides a process and system for producing sodium hydroxide, and a process for the commercial production of soda ash.
摘要翻译: 本发明提供了一种适用于具有氯 - 碱膜细胞的氢氧化钠生产设备的氯化钠盐水的生产方法和系统,所述方法包括(a)对含有溶解的氯化钠的进料水进行纳滤,产生渗透物和渗余物, 其中所述渗余物包含至少85%的来自所述给水的任何二价离子; 和(b)纯化渗透物以产生适合用于具有氯 - 碱膜细胞的氢氧化钠生产设备的氯化钠盐水,其中步骤(b)包括电渗析渗透物以产生浓度较高的总溶解浓度 盐和比渗透物更少的二价离子比例,以及包含水和从渗透物分离的二价离子的稀释剂。 本发明还提供了用于生产氢氧化钠的方法和系统,以及商业生产苏打灰的方法。