摘要:
In order to provide a new PSA method which can concentrate simultaneously a strong adsorbate such as xenon and a weak adsorbate such as nitrogen in a high concentration with a high recovery percentage when highly valuable gas such as xenon and krypton contained in the exhaust gas from a semiconductor manufacturing equipment, etc. is recovered in a high concentration with a high recovery percentage, the present invention provides a new PSA method in which the method uses a separation apparatus comprising a lower column and a upper column which are filled with an adsorbent, a material gas storage tank for storing the material gas to be introduced into the lower column, a strong adsorbate storage tank for storing a main component which is easily adsorbed by the adsorbent, and a compressor, and the strong adsorbate which is easily adsorbed by the adsorbent and the weak adsorbate which is not readily adsorbed by the adsorbent are recovered, wherein the method comprises an (a) adsorption step, (b) rinse step, (c) low column depressurization step, (d) upper column depressurization step, and (e) purge step sequentially repeated based on a predetermined sequence.
摘要:
In order to provide a new PSA method which can concentrate simultaneously a strong adsorbate such as xenon and a weak adsorbate such as nitrogen in a high concentration with a high recovery percentage when highly valuable gas such as xenon and krypton contained in the exhaust gas from a semiconductor manufacturing equipment, etc. is recovered in a high concentration with a high recovery percentage, the present invention provides a new PSA method in which the method uses a separation apparatus comprising a lower column and a upper column which are filled with an adsorbent, a material gas storage tank for storing the material gas to be introduced into the lower column, a strong adsorbate storage tank for storing a main component which is easily adsorbed by the adsorbent, and a compressor, and the strong adsorbate which is easily adsorbed by the adsorbent and the weak adsorbate which is not readily adsorbed by the adsorbent are recovered, wherein the method comprises an (a) adsorption step, (b) rinse step, (c) low column depressurization step, (d) upper column depressurization step, and (e) purge step sequentially repeated based on a predetermined sequence.
摘要:
Purification material for removing a contaminant from an impure hydride gas comprising an adsorbent comprising a reduced metal oxide on a porous support and a desiccant. The porous support may be selected from the group consisting of activated carbon, alumina, silica, zeolite, silica alumina, titania, zirconia, and combinations thereof. The reduced metal oxide may comprise one or more metals selected from the group consisting of Group I alkali metals (lithium, sodium, potassium, rubidium, and cesium), Group II alkaline earth metals (magnesium, calcium, strontium, and barium), and transition metals (manganese, nickel, zinc, iron, molybdenum, tungsten, titanium, vanadium, cobalt, and rhodium). The desiccant may be selected from the group consisting of hygroscopic metal salts, zeolites, single metal oxides, mixed metal oxides, and combinations thereof.
摘要:
This invention is directed to a system and a process for protecting a gas purification system from damage comprising passing a stream of impure gas through a catalyst bed and measuring the temperature difference before and after the catalyzed bed reaction through a data analyzer to determine the impurity of the gas prior to controlling the feed of impure gas into or out of a reactor for producing a purified gas. In a preferred embodiment, the catalytic beds may be in parallel form, and the plurality of temperature measurements before and after the catalytic beds is considered by a data analyzer for controlling the impure gas for feeding into the purification reactor.
摘要:
A method for carrying out nitrogen analysis by ionization mobility spectroscopy, at concentrations of few parts per billion (ppb) in argon is described. The method involves the addition of hydrogen in concentration of at least 5 ppb and lower than 100 parts per million (ppm) to the argon to be analyzed; the hydrogen addition step is possibly preceded by a purification operation of the argon flow, so as to reduce the total concentration of impurities other than nitrogen under 1 ppb.
摘要:
A process for removing parts-per-million quantities of unwanted species such as oxygen, carbon monoxide, hydrogen, carbon dioxide and water from a cryogenically produced nitrogen gas stream using an oxygen removal step prior to a nickel-based catalytic adsorption step in order to eliminate the need for hydrogen regeneration in either step. Ultrapure nitrogen heated to less than 500.degree. C. is used to purge and hold the beds used for unwanted species removal, eliminating the need for hydrogen regeneration thus reducing the regeneration cycle time and cost.
摘要:
A process for recovery of helium from one or more than one helium-containing off-gas streams comprises preconditioning off-gas through a multi-stage preconditioning device, cryogenically separating a helium-enriched gas fraction from the preconditioned off-gas received from the preconditioning device a cryogenic separation device, and purifying the helium-enriched gas fraction received from the cryogenic separation device using a purification device so as to obtain purified helium gas with a higher helium content than the helium-enriched gas.
摘要:
The invention relates to a gas purifier that removes moisture and oxygen from inert gases and reducing gases, for example, at sub-atmospheric pressures. The purifier can remove part per million levels of moisture in a gas stream to less than 100 parts per trillion by volume, and has a low pressure drop and a sharp breakthrough curve.
摘要:
This invention relates to an improvement in a process for removing water from a hydride gas, and particularly ammonia, by contacting the hydride gas with a drying agent under conditions for effecting removal of the water. The improvement for significantly reducing the water content to trace levels in said hydride gas resides in the use of at least Group 1 metal oxide and at least one Group 2 metal oxide as a drying agent.