Adsorption of fatty acid sodium salts on ion exchange resins

Abstract

In recent years many adsorbents have been investigated for the purpose of use for treatment of wastewaters? Adsorption on ion exchange resins provides a technique for purification of municipal and industrial wastewaters?-4 In the present investigation, the adsorption equilibrium of fatty acid sodium salts with various carbon numbers onto ion exchange resins (IRA94 and IRA68) was studied in aqueous solution to obtain precise information about the treatment of wastewaters containing detergents (see Table I). EXPERIMENTAL MaterialsThe ion exchange resins used in this experiments were a styrene type copolymer and an acrylamide type copolymer known as Amberlite IRA94 and IRA68 (Rohm and Hass Co.). Both are weekly basic resins and the exchange capacities are 4.6 (IRA94) and 5.6 (IRA68) meq/g of dried resins, respectively. The resins were purified by standard methods and used as HBr salts. The absorbate studied were four fatty acid sodium salts from commercial sources (stated minimum assay 98%) and were used without further purification.

Separation of Oleic Acid from Soybean Oil Using Mixed-Bed Resins

“…This difference in results can be explained by the presence of the acidic functional group on the surface of the mixed-bed resins. Ihara also demonstrated that the sorption of fatty acid sodium salts occurred on weakly basic ion-exchange resins Amberlite IRA94 and IRA68 . The single-site Langmuir model fitted the Ihara data set for each sodium salt evaluated.…”

“…The single-site Langmuir model fitted the Ihara data set for each sodium salt evaluated. However, the overall interpretation of their results was limited to fitting the model within their paper, and no additional information was given into the mechanism of removal or adsorption capacity …”

“…Ihara also demonstrated that the sorption of fatty acid sodium salts occurred on weakly basic ion-exchange resins Amberlite IRA94 and IRA68. 27 The singlesite Langmuir model fitted the Ihara data set for each sodium salt evaluated. However, the overall interpretation of their results was limited to fitting the model within their paper, and no additional information was given into the mechanism of removal or adsorption capacity.…”

“…However, the overall interpretation of their results was limited to fitting the model within their paper, and no additional information was given into the mechanism of removal or adsorption capacity. 27 An additional experiment was also performed to evaluate the hypothesis that the quaternary site was responsible for the adsorption of FFA in our system. Two acidic resins, Amberlyst 36 (wet) and Dowex Monosphere M-31, were evaluated to determine the extent of oleic acid adsorption to the sulfonic acid functional group present in the mixed-bed resins and the Amberlite MB-150 pseudofirst order m t ) m e [1exp(k 1 t)] m t ) 7.9[1exp( -1.62t)] 0.999 0.85 pseudosecond order m t ) t / (1/k 2 m e 2 ) + (t/m e ) m t ) t / 1/((0.9)(8.0 2 )) + (t/8.0) 0.999 0.66 modified second order m t ) m e (1 -[1 / β + k 2 t]) m t ) 8.1(1 -[1 / 1.0 + 6t]) 0.999 0.95 Dowex Monosphere MR-450 UPW pseudofirst order m t ) m e [1exp(k 1 t)] m t ) 7.62[1exp( -0.48t)] 0.999 1.42 pseudosecond order m t ) t / (1/k 2 m e 2 ) + (t/m e ) m t ) t / 1/((0.1)(8.1 2 )) + (t/8.1) 0.990 4.80 modified second order m t ) m e (1 -[1 / β + k 2 t]) m t ) 8.3(1 -[1 / 0.8 + 0.81t]) 0.987…”