GB139488A - Method of recovering solvents - Google Patents

Abstract

139,488. Lunt, G. P. April 7, 1916, [Convention date]. No Patent granted (Sealing fee not paid). Volatile liquids, recovering.-In removing solvent from nitrocellulose explosives, or other colloid substances such as india-rubber, the solvent is evaporated by means of a current of a gas, which will not form an explosive mixture with the solvent, circulated in a closed circuit, and the vapour of the solvent is removed from the gas by a spray of the solvent, or one of the constituents thereof, in a liquid form, or of a liquid in which the solvent is soluble. The colloid is placed on sliding shelves b in a chamber a heated by hot-water pipes r, s. Dampers m, n are provided for cutting the chamber out of the circuit while it is being re-charged, and an outlet o is provided with a damper p whereby air can be displaced when a heavy gas, such as carbon dioxide or sulphur dioxide, is used in the circuit. The gas is circulated by a pump k and passes through a condenser d, provided with jets e of the condensing liquid, and a baffle g for catching the spray. The condensing liquid may be cooled, and it is stated that by regulating the temperature and volume of the condensing liquids the amount and proportions of the different constituents of the solvent condensed can be regulated, so that evaporation takes place at a rate equal to that at which the solvent diffuses through the colloid, thus avoiding blistering.