Abstract: An adhesive pressure bandage for treating a wound or reduce scarring of a skin of a patient, the pressure bandage including a pressure member made of an elastic material. The pressure member comprising a curved central portion and two end portions. The pressure member also having two sides, an inner surface facing towards the patient and an outer surface facing away from the patient, and between the inner surface and the skin of the patient is an adhesive to attach the pressure member to the skin of the patient. Between the inner surface of the pressure member and the skin of the patient is a treatment device that is in contact with the wound, after the adhesive pressure bandage is applied to the skin of the patient, this treatment device is located between a central portion of the pressure member and the wound.

Abstract: A process for separation of a gas mixture containing three components, e.g. a mixture comprising hydrogen, carbon monoxide and carbon dioxide produced by steam reforming a hydrocarbon, by pressure swing adsorption is disclosed.

Abstract: A process for separation of a gas mixture containing three components, e.g. a mixture comprising hydrogen, carbon monoxide and carbon dioxide produced by steam reforming a hydrocarbon, by pressure swing adsorption is disclosed.

Abstract: There is disclosed an improved PSA process and apparatus for gas enrichment wherein the pressure levels of the vent gas stream and/or product stream are used to drive gaseous diffusion cells to produce a feed gas stream and/or a purge gas stream to be used in the pressure swing adsorption process to increase on-line production time and to utilize the waste pressure energy thereby decreasing energy requirements per unit of production.

Abstract: This invention relates to an energy efficient method of vacuum regenerating an adsorbent bed. In a typical process, the adsorbent bed undergoes an adsorption step, a vent step, and a vacuum purge step. According to the present invention, the energy of the usually discarded vent gas is used to raise a dense liquid from a lower tank to a higher tank. The potential energy of the raised liquid, upon returning from the higher tank to the lower tank, is used to generate a vacuum for vacuum regeneration of the adsorbent bed.

Abstract: An improved high yield process is disclosed for argon recovery from an ammonia synthesis plant purge gas comprising hydrogen, nitrogen, argon, ammonia, and methane. In one embodiment of the present invention, this purge gas is subjected to the following steps:(i) Separation of ammonia at high pressure by adsorption using zeolite molecular sieve material, which is subsequently regenerated by hot purge combined with pressure reduction;(ii) Separation of methane and most of the nitrogen by pressure swing adsorption using a molecular sieve or an activated carbon material having greater selectivity for methane than argon;(iii) Separation of hydrogen for recycle to the ammonia synthesis plant using a high pressure cryogenic distillation column or a membrane separator; and(iv) Separation of the nitrogen by cryogenic distillation means to obtain essentially pure liquid argon product.

Abstract: An improved process is provided for the recovery of argon from a gas mixture comprising hydrogen, nitrogen, methane and argon. An example of such a gas mixture is purge gas from an ammonia synthesis plant which has been subjected to the conventional steps of ammonia absorption and a membrane separation to obtain hydrogen for recycle to the ammonia plant. In a first embodiment, the gas mixture is treated in a pressure swing adsorption (PSA) system to remove the methane, residual moisture and most of the hydrogen, the resulting gas mixture is treated in a membrane separator to remove most of the hydrogen, which may be used as purge gas for the PSA system, and the resulting stream treat by cryogenic distillation to separate the nitrogen and residual hydrogen to obtain an essentially pure argon product. In a second embodient, the second treatment is eliminated and all of the hydrogen is removed by the cryogenic distillation.

Abstract: Argon and nitrogen are produced in a basic two step process. In a first step, oxygen is removed from a compressed air feed using low temperature PSA (pressure swing adsorption). In the second step, argon and nitrogen mixture is separated by cryogenic distillation. The process yields crude liquid argon and very high purity gaseous nitrogen.

Abstract: An improved process is disclosed for argon recovery from an ammonia synthesis plant purge gas comprising hydrogen, nitrogen, argon, ammonia, and methane. In one embodiment of the present invention, this purge gas is subjected to the following steps:(i) Separation of ammonia at high pressure by adsorption using zeolite molecular sieve material, which is subsequently regenerated by hot purge combined with pressure reduction;(ii) Separation of methane and most of the nitrogen by pressure swing adsorption using a molecular sieve or an activated carbon material having greater selectivity for methane than argon;(iii) Separation of hydrogen for recycle to the ammonia synthesis plant using a high pressure cryogenic distillation column of a membrane separator; and(iv) Separation of the nitrogen by cryogenic distillation means to obtain essentially pure liquid argon product.

Abstract: An improved process is disclosed for argon recovery from an ammonia synthesis plant purge gas stream comprising hydrogen, nitrogen, argon, methane, and ammonia. This purge gas is conventionally subjected to ammonia absorption and a first membrane separation of hydrogen for recycle to the ammonia plant. The hydrogen depleted non-permeate gas stream from the first membrane separator, comprising the aforesaid four components, and any residual moisture from the ammonia absorption, is subjected, according to a first embodiment of the present invention, to the following steps: (i) Separation of methane and residual moisture and most of the nitrogen in the gas stream in a pressure swing adsorption system using molecular sieve or activated carbon material. (ii) Separation of most of the hydrogen in a second membrane separator. The separated hydrogen may be used as purge gas for regeneration of the pressure swing adsorption systems of step (i).