Comparison of amine-selective properties of weak and strong cation-exchangers.
The capacity of several weak and strong cation-exchangers to adsorb 2-diethylaminoethanol (DEAE) and (2,3-hydroxypropyl) trimethylammonium chloride (HPMAC) from sodium-containing process water streams, and the ease of subsequently eluting the amines and regenerating the exchangers, were investigated. (2,3-hydroxypropyl) trimethylammonium chloride was enriched 40-fold compared with the initial amine/sodium-ratio in the bulk fluid by Amberlite IRC-50. The highest selectivity for 2-diethylaminoethanol (26-fold) was provided by Imac HP336. Neither of the selected strong cation-exchangers showed any selectivity towards 2-diethylaminoethanol, but they enriched (2,3-hydroxypropyl) trimethylammonium chloride approximately three to four fold. These findings suggest that weak cation-exchangers (WCX) could be readily used for the selective removal of these or similar amines from sodium-containing process waters.
Stenholm
Ake
A
Product Supply, GE Healthcare, Protein Separations, Björkgatan 30, S-751 84 Uppsala, Sweden. ake.stenholm@ge.com
Lindgren
Helena
H
Shaffie
Juliana
J
D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D002411:Cation Exchange Resins / Q000737:chemistry*; D004983:Ethanolamines / Q000737:chemistry; D045483:Rivers / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D013997:Time Factors; D050337:Trimethyl Ammonium Compounds / Q000737:chemistry
D000588:Amines; D002411:Cation Exchange Resins; D004983:Ethanolamines; D050337:Trimethyl Ammonium Compounds; D012965:Sodium Chloride; C007369:2-diethylaminoethanol