Abstract: In a process for separating linear from branched hydrocarbons, the feed is brought in contact with a carbon membrane with critical size from 0.39 to 0.55 nm. The isomer with the larger size remains on the feed side. A membrane can be produced by activating a membrane by reacting it with oxygen and then with hydrogen.

Abstract: A process for manufacturing carbon membranes having controlled pore sizes comprises the steps of: a) causing a stream of a pyrolysable carbon-containing gas to come into contact with a carbon membrane having a pore size and/or distribution larger than the desired pore size and/or distribution; b) raising the ambient temperature of the said membrane to or above the temperatures at which the adsorbed carbon-containing gas pyrolyzes; and c) substantially purging the atmosphere surrounding the membrane from carbon-containing gas.

Abstract: A method of selective clogging of failed hollow fibers of a membrane module, including a pack or bundle of fibers in a shell-side and bore-side arrangement which includes failed fibers and non-failed fibers, comprises the steps of: clogging bores of all of the fiber at one end of the pack or bundle of the fibers; substantially evacuating the membrane module both at the shell-side and at the bore-side; filling the bore-side and the shell-side with a non-permeant gas; subsequently-holding the membrane module vertically, disconnecting the bore-side of the membrane module from a supply of the non-permeant gas and dipping another end of the membrane module opposite to the clogged end into a reservoir containing a liquid sealant; applying a reduced pressure to the shell-side for a period of time sufficient to permit suction of sealant into the bores of the failed fibers through a failure of which vacuum is applied to the bore-side; allowing the sealant to solidify at least partially to clog the bores of both the fa

Abstract: An electrochemical filter which consists of a fibrous electrically conducting material to which there are bonded microscopic particles of carbon or active charcoal. A variety of fibers can be used: carbon fibers, graphite fibers, fibers of inert metal etc. A process for the production of such filters where the particles are bonded to the fibers by a pyrolyzable binder which is pyrolyzed. Electrochemical separation and filter devices based on such filter media.

Abstract: A pharmaceutical preparation for topical application, for the treatment of disorders of the skin, comprising killed mycobacteriae in a suitable vehicle, advantageously in combination with cord factor (CF) and a method for the treatment of disorders of the skin of mammals and especially humans, including premalignant and malignant types of growth and of conditions due to the immunodeficiency of the mammal treated, which comprises disinfecting the affected area of the skin, removing the stratum corneum (horny layer) by repeated application of adhesive tape and applying thereto an ointment as defined above, covering same with an impervious wrap and leaving same in place for 1 to 2 days, and if necessary repeating the treatment at suitable intervals of time.