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公开(公告)号：US20170225990A1
公开(公告)日：2017-08-10
申请号：US15328649
申请日：2015-07-24
申请人： IONEX SG LIMITED
发明人： Michael Waite
CPC分类号： C02F9/00 , B01J41/05 , B01J49/07 , B01J49/57 , C02F1/001 , C02F1/42 , C02F1/461 , C02F1/5236 , C02F1/66 , C02F2001/425 , C02F2101/006 , C02F2101/101 , C02F2101/103 , C02F2101/106 , C02F2101/12 , C02F2101/163 , C02F2101/22
摘要： The present invention relates to a method of removing chromate ions from an ion-exchange effluent, the method comprising: (i) providing an ion-exchange effluent comprising chromate ions obtained from the regeneration of an ion-exchange material, (ii) admixing the ion-exchange effluent with a source of alkali metal dithionite to form a first precipitate, and (iii) removing the first precipitate
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公开(公告)号：US09908112B2
公开(公告)日：2018-03-06
申请号：US14764756
申请日：2014-02-03
申请人： IONEX SG LIMITED
发明人： Michael Waite
IPC分类号： B01J49/00 , B01J41/05 , B01J49/07 , B01J49/57 , B01J49/60 , C02F1/42 , C02F101/16 , C02F101/22 , C02F1/461
CPC分类号： B01J49/57 , B01J41/05 , B01J49/07 , B01J49/60 , C02F1/42 , C02F1/461 , C02F2001/422 , C02F2101/163 , C02F2101/22 , C02F2303/16
摘要： The present invention relates to a method of regenerating an ion exchange material loaded with chromate ions and nitrate ions in an ion exchange column, the method comprising subjecting the loaded ion exchange column to a regeneration sequence comprising the following steps: (i) passing a first salt solution through the column forming a first effluent solution; (ii) passing a second salt solution through the column to at least partially remove the chromate ions from the column forming a second effluent solution, wherein the second salt solution has a higher salt concentration than the first salt solution; (iii) passing a third salt solution through the column to at least partially remove nitrate ions from the column forming a third effluent solution, wherein the third salt solution has a salt concentration higher than the second salt solution.
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