摘要:
A process is disclosed for treating carbonaceous catalyst with a gaseous halogen or a gaseous halogen compound to increase the catalytic activity and prolong the useful life of the catalyst. The treatment of the catalyst is conducted at temperatures above about 150 degrees C., preferably with the use of an inert gas, which inert gas is flowed through the carbonaceous material, and which inert gas carries the gaseous halogen or the gaseous halogen compound to the carbonaceous material.
摘要:
Method and apparatus for the removal of sulfur oxides and nitrogen oxides from exhaust gas with the addition of gaseous ammonia at temperatures between 110.degree. and 180.degree. C. The exhaust gas is led across carbon-containing adsorption agent flowing downwardly within a reactor, a portion of sulfur oxide initially being adsorptively removed in a upper part of a travelling bed, with nitrogen oxide catalytically reduced to nitrogen as well as further sulfur oxide being separated in a lower part of the travelling bed. Unloaded adsorption agent is delivered to the upper bed part, partially loaded adsorption agent is removed from that bed part and delivered to the lower bed part without mingling, loaded adsorption agent is removed from the lower bed part and led to a regeneration, after which it is delivered to the upper bed part.
摘要:
Use of activated carbon for reduction of nitric oxides with ammonia from exhaust gases using ammonia as reduction agent in the temperature range between 90.degree.-150.degree. C., made from hardcoal, blended with binding agents like pitch, bitumen, tar or tar oil, shaped and subjected to low-temperature carbonization with a heating rate of 20.degree.-100.degree. C./min to temperature between 700.degree.-900.degree. C. in an atmosphere containing 2-5% by vol. of oxygen, so that for the activated coke 2-8% of volatile matter and a surface of 20-150 am.sup.2 /g is arrived at.
摘要:
A process for manufacturing a carbon catalyst for use in NO.sub.x reduction with ammonia catalyzed by active carbons and active cokes is described. The new carbon catalyst exhibits improved catalytic activity and hence a higher yield in NO. In the manufacturing process, a mixture of ground, oxidized hard coal and binders is moulded, carbonized at temperatures between 700.degree. and 900.degree. C., and then activated with steam at a temperature of 800.degree. to 850.degree. C. for 45 to 100 minutes, until a degree of activation of 5 to 15% is obtained.
摘要:
A process of and apparatus for producing oxygen with a low fraction of argon from a gaseous medium like air, in which a gaseous medium is introduced into a first adsorption unit to produce an intermediate gas enriched with oxygen and depleted of argon. The intermediate gas is then supplied to a second adsorption unit in which the final product gas is prepared as well as a by-product which is returned into the process. Each of the adsorption units includes at least two adsorbers operating in a working cycle wherein the working cycle of the adsorbers of the second unit lasts about twice as long as the working cycle of the adsorbers of the first unit. For allowing an evacuation of each adsorber and thus a regeneration thereof, a common vacuum pump is connected to each unit in such a manner that the regeneration of the adsorbers of the second unit is temporarily interrupted when one of the adsorbers of the first unit is evacuated.
摘要:
A pressure-swing adsorption system is used to enrich the methane content of mine gas obtained from bores around mine shafts or galleries from the customary 25 to 45% by volume to a product gas quality of 50% by volume. Using a carbon molecular sieve adsorbent, the adsorption is carried out at 5 to 8 bar and is followed by a uniflow expansion to an intermediate pressure and a counterflow expansion to a flushing pressure of 1.1 to 2 bar. Counterflow flushing is carried out with waste gas and the product gas is a mixture of the gases obtained by counterflow expansion and flushing.
摘要:
Pressure swing adsorption with increased recovery of a highly adsorbable product gas component is carried out with a cycling in which, during the flushing phase, and at least over the latter portion thereof, the flushing gas has a concentration in the product gas component which is substantially equal to that of the product gas. To further increase the yield and the concentration of the product gas component in the product gas, the pressure in the absorber is reduced over a time period between the termination of the adsorption phase and the beginning of the desorption phase, with the effluent gas during this reduction in pressure being reused in the pressure swing adsorption cycle.
摘要:
Method for separating gas mixtures resulting from direct flow loading of adsorption reactors by means of a pressure change technique in a two stage adsorption reactor consisting of a prefilter and a separating filter, whereby strongly adsorbable impurities from the gas mixture are adsorbed in the prefilter and the remainder of the undesirable gas components are adsorbed in the separating reactor. Thereby, product gas flows off at the end of the separating reactor shortly before the passage therethrough of a non-desirable gas component. Thereafter, the prefilter and the separating reactor are disconnected and the prefilter is partially relieved by a gas counter flow and the separating reactor is partially relieved by direct gas flow. After reconnection of prefilter and separating reactor the unit is further released in the counter current, subsequently rinsed and is again brought to charge pressure in the direct or counter current. The prefilter can be prerinsed before the gas like reconnection with the separating reactor. During rinsing and pressure build up one can use relieve gas. Preferably, four coupled two stage adsorption reactors are used as well as an additional prefilter.
摘要:
Process for producing an active catalyst by ammonia treatment of active carbons at high temperatures, in which an active carbon/active coke is impregnated with an aqueous solution of ammonium sulphate, which can be reacted with sulphuric acid, is dried at 120.degree. C. and is then heated in an inert gas stream to temperatures above 350.degree. C. Application of the active carbon catalyst as a reducing and/or oxidizing catalyst, for example for NO.sub.x elimination from exhaust gases using ammonia.
摘要:
SO.sub.2 -containing gas is made to contact a carbon-containing material to reduce the gas to a gas mixture containing sulfur and also containing H.sub.2 S and SO.sub.2 in a volume ratio of 2:1. The sulfur is then removed by condensation and the remaining gas mixture subjected to a Claus-process treatment to obtain additional sulfur from it.