Search

The ability of cobalt-, iron-, and zinc-containing framework compounds to take up impurities (free fatty acids and peroxide compounds) from linseed, false fl ax, and sunfl ower oil was studied. These framework structures improve the physicochemical properties and quality of the vegetable oils tested. The metal-organic frameworks surpass in performance the traditionally used industrial and natural sorbents. The sorbents tested preserve the performance for no less than five cycles. [ABSTRACT FROM AUTHOR]

Isolation and purification of L-lactide to reach the polymerization purity level with removal of impurities by fractional melting was studied. The process implementation was suggested, and the influence of various parameters on the rate and degree of impurity removal was examined. The optimum conditions for removal of the main impurities from L-lactide were found. The method allows preparation of L-lactide of polymerization purity in approximately 50% yield. [ABSTRACT FROM AUTHOR]

Crystallization of potassium acetate from aqueous solutions, an effect of product yield and washing of its crystals on an efficiency of purification were investigated. Behavior of KCHCOO·1.5HO was studied in heating. Based on data of the study a technological scheme of producing anhydrous potassium acetate of high purity was developed. [ABSTRACT FROM AUTHOR]

Prospects for use of microscopic amounts of fullerenes as a modifying additive for improving the absorption capacity of conventional adsorbents in both static and dynamic conditions of purification of saturated hydrocarbons to remove aromatic compounds were examined. [ABSTRACT FROM AUTHOR]

Results of the application of microfine ionites of different classes for sorption methods in the production of versatile drugs are systemized. Kinetic and dynamic parameters of sorption isolation and chemical purification of drugs with participation of ion-exchanger of small graining are discussed; essential advantages of their application allowing intensification of ion-exchange technological processes of drugs production are determined. The review can be useful at elaboration of new sorption methods used for the production of the wide assortment of drugs and, first of all, antibiotics, enzymes, and vitamins. [ABSTRACT FROM AUTHOR]

Processes of synthesis, isolation, and purification of benzylpenicillin β-diethylaminoethyl ester hydroiodide were studied. The optimal conditions of benzylpenicillin esterification with chloroethyldiethylamine in dimetylformamide and acetonitrile were found. Processes for isolation of the target product were developed and its physicochemical properties were studied. Product stabilization conditions providing a stable pH value in solutions of benzylpenicillin β-diethylaminoethyl ester hydroiodide were found. [ABSTRACT FROM AUTHOR]

Abstract  Regularities of adsorption by clay of some commercial sorts of anthocyans extracted from plant materials are investigated. The interrelation between sorption ability and structure of sorbates is revealed. Introduction of organic solvent is shown providing a possibility of targeted changing sorption properties of system and sorption purification of anthocyans. [ABSTRACT FROM AUTHOR]

Abstract  Composition and characteristics of lignosulfonic acids recovered from technical-grade ligno-sufonates were studied by IR spectroscopy, viscometry, and elemental and chemical analyses. The dependence of the chemical composition and characteristics of lignosulfonic acids on the procedures of their recovery and purification was examined. [ABSTRACT FROM AUTHOR]

Abstract  The conditions for the sulfation of rough baddeleyite concentrate to remove impurity minerals were studied. [ABSTRACT FROM AUTHOR]