The solvent extraction of Fe3+ from aqueous chloride solution by bis-(2,4,4-trimethylpentyl) monothiophosphinic acid (Cyanex 302, H2A2) dissolved in kerosene has been investigated over a wide range of aqueous acidity as a function of phase contact time, concentrations of Fe3+, H+ and Cl- in the aqueous phase, Cyanex 302 concentration in the organic phase and temperature. The equilibration time is 50 min. The distribution ratio is found to be independent on [Fe3+] in the aqueous phase at a constant aqueous acidity and extractant concentration. The H+, extractant and Cl- dependences are -1, 0.5 in low concentration region of extractant and -0.5, respectively; which suggest that extraction occurs via the following two parallel reactions: (i) FeCl3 + 0.5 H2A2(o) FeCl2.A(o) + H+ + Cl-; and (ii) FeCl2 + + 0.5 H2A2(o) -----FeCl2A(o) + H+. Temperature dependence data give ΔH value of 9.95 kJ/ mol. The loading capacity of Cyanex 302 towards Fe3+ is 29.41 g Fe3+/100 g Cyanex 302. The extraction equilibrium constant (Kex) is 10-0.632. Extraction ratio is found to be dependent on diluent used. Stripping of the extracted complex is found to be a difficult task, but may be made effective by a solution containing 6 M H2SO4 and 1 M Na2C2O4. Keywords: Extraction equilibrium; Fe3+ extraction; Cyanex 302; Chloride medium.DOI: http://dx.doi.org/10.3329/bjsir.v46i4.9583 BJSIR 2011; 46(4): 407-414

Polyphenolic compounds were isolated from the aqueous extract of green coconut shell. Benzoyl ester derivatives were prepared with these polyphenols. Monobenzoyl and dibenzoyl derivatives of a polyphenol were separated and characterized.

Studies were carried out on the lipid classes and fatty acid compositions of petuli seed oil. It was observed that petuli seed grown under the soil and climatic condition of Bangladesh contains about 22% pale yellow coloured oil. The total lipids were fractionated into three major lipid classes, neutral lipid glyco lipid and phospho lipid by silicic acid column chromatography. The neutral lipid was accounted to 92.5% of the total weight of the lipid applied. The oil was also fractionated into mono, di and triglyceride by silicic acid column chromatography.The triglyceride was counted for over 90% of the total weight of the oil. The fatty acid compositions of the oil were analyzed by Gas liquid Chromatography and found the major fatty acid α-elaeostearic acid 38.50%, oleic acid 34.35%, linoleic acid 26.15% and small amount of arachidic acid 1%.