Abstract: Method of and appartus for liquid recirculation in at least substantially closed circuit which is particularly suitable for recycled liquid chromatography. The circulating liquid is brought into motion in the circuit inlet by working fluid supplied under pressure, e.g. from a pump, pressure gas cylinder, or the like. Circulating liquid approaching the end of the circuit beyond the circuit outlet is mechanically and at regular intervals repeatedly transported in the form of slugs into the beginning of the circuit in advance of the circuit inlet where these slugs are again forced into the circuit inlet by means of working fluid. The injection of one slug into the circuit inlet and the pushing of the following slug of equal volume out from the circuit outlet are carried out simultaneously.

Abstract: An economical procedure for the recovery of platinum from a spent catalyst involves subjecting the catalyst to fluorination with elementary fluorine or a mixture thereof with hydrogen fluoride at a temperature ranging from 100.degree.-600.degree. C. The resultant platinum fluoride is then converted to platinum in elemental form.

Abstract: A process for the preparation of a proteinaceous concentrate by the aerobic cultivation of yeast on whey is described. The described technique involves preparing and fermenting a concentrated nutrient medium. Following fermentation, the medium is brought to a boil, cooled and again fermented with yeast in an ethyl alcohol medium.

Abstract: A technique for recovering palladium from a spent palladium catalyst or ash thereof involves fluorinating the catalyst or ash at elevated temperatures to yield palladium fluoride and decomposing the fluoride with a mineral acid at a temperature ranging from 90.degree. - 100.degree. C.

Abstract: A method for the anionic polymerization of unsaturated monomers involves effecting reaction in the presence of an organic derivative of a metal alumina hydride in an amount ranging from 0.01 to 5.0 mol percent based upon the amount of unsaturated monomer.

Abstract: A technique for measuring the concentration of combustible components of a gas mixture such as air by means of a catalytic bridge. The mixture to be analyzed is introduced into a closed chamber in which the catalytic portions of the bridge are located. After the bridge is electrically excited to heat the catalytic portions, the changes in the output bridge voltage resulting from burning of the gas by at the catalytic bridge element are measured over a prescribed interval to yield an indication proportional to the combustible component concentration. The prescribed interval is arranged to start after at least enough time has elapsed following the commencement of the electrical excitation of the bridge for the bridge to come to equilibrium under zero concentration conditions.

Abstract: Method of sugar cane treatment between the harvesting and processing period. Sugar cane is contacted in such period with isothiocyanate, preferably allyl isothiocyanate at a ratio of one weight part of allyl isothiocyanate to 1,000 - 10,000,000 weight parts of sugar cane.

Abstract: A method for preparing N-substituted 3,5-dicyan-1,4-dihydropyridines designed for use as radioactive radiation detectors in scintillation techniques is described. The method involves reacting an unsubstituted dihydropyridine derivative in an aprotic polar solvent with an alkali metal or alkaline earth metal hydride or amide and, subsequently, alkylating the resultant product.