A process for the recovery of high purity natamycin from fermentaion broth by extraction with methanol is disclosed. In one embodiment the process comprises the steps: (1) adding methanol to a natamycin feed stream comprising at least 2 g/L of solid suspended natamycin to form an extraction medium, and maintaining the extraction medium at a temperature of 0.degree.-25.degree. C., preferably not over 15.degree. C.; (2) adjusting the pH of the extraction medium to 1.0 to 4.5 while maintaining the ...

The disclosed pressure swing adsorption processes can recover helium from source streams of less than about 10 percent by volume helium and concentrate the helium to a concentration of greater than about 98 percent by volume. Two stages of pressure swing adsorption are used in series. The source of the helium gas will be natural gas wells. The source gas will contain hydrocarbons but in most instances the primary gas other than helium will be nitrogen. Each stage of pressure swing adsorption wil...

Starting from a mixture containing tocopherol, fats and/or fat derivatives, more particularly fatty acids, and optionally sterol and/or sterol derivatives, the free fatty acids present in the mixture are esterified with an alcohol. The mixture is then transesterified with an alcohol in the presence of a basic catalyst. After the transesterification, the excess lower alcohol is distilled off from the reaction mixture. The transesterification catalyst and the glycerol present, if any, are removed ...

In the recovery of an electrically conductive metal from a liquid containing the metal in solution, a cathode member for deposition of the metal by electrolysis, comprises a carrier sheet with a cathode element of the metal to be recovered, on one side of the sheet; the carrier sheet is of a material from which the metal is readily refinable when smelted with the carrier sheet; the cathode member has particular application for removal of the silver content of fixer solution in photography; suita...

A recovery boiler for combusting spent liquor from cellulose cooking while at the same time recovering chemicals. The recovery boiler is constructed for so-called "rotafire" combustion and the speed of rotation of the secondary air has been increased by a constriction of the boiler being arranged at the tertiary air level. The invention also includes a process for using the boiler which is based on certain ports through which the secondary air is blown in being provided with air which is at a hi...

Pure maltol is recovered from a mixture containing maltol by extraction into an aqueous solution, optionally in the presence of a substantially water-immiscible solvent in which the maltol in the mixture is substantially insoluble.

Removal of mercury from a gas stream by washing the gas with alkaline hypochlorite containing added alkali metal or calcium chloride.

Gold is recovered from dilute solution by complexing with malononitrile, followed by sorption on, and elution from, an anion-exchange resin having both weakly basic and strongly basic groups.

The nickel content of nickel-magnesium alloy fines containing up to 50 percent silicon is recovered in usable metal form by reacting said fines exothermically with powdered iron oxide, an alkali metal nitrate and magnesia fluxing ingredients to provide a nickel-containing metal phase and a fluid magnesia-containing slag phase.

Low-grade, finely disseminated copper oxide ores are beneficiated to enhance the winning of metallic copper therefrom by crushing and sieving the ore to particles of suitable size, preheating the ore particles, reacting a chlorine-donating gas with the ore particles at a controlled elevated temperature to form copper chloride (preferably cuprous chloride) therein and maintain it substantially in molten liquid form, and then reducing the molten liquid copper chloride at the elevated temperature t...