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    • 4. 发明授权
    • Removal of nitrogen oxides from gases
    • 从气体中去除氮氧化物
    • US5955045A
    • 1999-09-21
    • US874662
    • 1997-06-13
    • Karl BaurHans-Peter LangebachHartmut NeumannUlrike Wenning
    • Karl BaurHans-Peter LangebachHartmut NeumannUlrike Wenning
    • B01D53/56C07C7/148C10G70/04B01D53/02
    • C07C7/1485B01D53/565C10G70/046
    • For selectively removing nitrogen oxides from a carrier gas that contains hydrocarbons, the nitrogen oxides are removed by chemisorption on metal oxides, without the occurrence of undesirable secondary reactions. The metal oxides are preferably formed from metals of the 6th to 8th subgroups, whereby manganese dioxide (MnO.sub.2,) is especially preferred as a metal oxide. The process can be conducted with one or more reactor beds, which preferably operate at 10 to 40.degree. C. and are regenerated with nitrogen at a temperature of 130 to 170.degree. C.By removing nitrogen oxides from an olefin-rich gas, for example from the waste gas of an FCC unit, the resultant gas can then be fed to a cryogenic olefin extraction stage without danger of explosion.Such a waste gas contains unsaturated hydrocarbons, hydrogen, carbon monoxide, and oxygen, the oxygen having a concentration preferably between 100 and 5000 mol ppm.
    • 为了从含有烃的载气中选择性地除去氮氧化物,通过金属氧化物上的化学吸附除去氮氧化物,而不会发生不希望的二次反应。 金属氧化物优选由第6〜8族的金属形成,特别优选二氧化锰(MnO 2)作为金属氧化物。 该方法可以用一个或多个反应器床进行,优选在10至40℃下操作,并在130-170℃的温度下用氮气再生。通过从富含烯烃的气体中除去氮氧化物,例如 从FCC装置的废气中获得的气体可以被送入低温烯烃提取阶段而不会有爆炸的危险。 这样的废气含有不饱和烃,氢,一氧化碳和氧,氧浓度优选为100-5000mol ppm。
    • 6. 发明申请
    • PROCESS AND DEVICE FOR DECOMPOSING LAUGHING GAS
    • 用于分解气体的方法和装置
    • US20120063982A1
    • 2012-03-15
    • US13144227
    • 2010-01-05
    • Ulrike WenningHans-Jörg ZanderAnton WellenhoferKarl-Heinz HofmannWibke KornFranz BeranNicole SchödelWolfgang Schmehl
    • Ulrike WenningHans-Jörg ZanderAnton WellenhoferKarl-Heinz HofmannWibke KornFranz BeranNicole SchödelWolfgang Schmehl
    • B01D53/56
    • C01B21/22A61M16/009A61M16/0093A61M2202/0283B01D53/8631B01D2257/402B01D2259/4533B01J23/40C01B21/02Y02C20/10Y02P20/153
    • The laughing-gas-containing gas (1) is diluted by means of a diluting gas (2). The diluting gas (2) is virtually free from water fractions in the dryer (3). After feed of the diluting gas (2) via the feed line (13), exhaust gas (8) from the catalytic decomposition (7) is added (4) to the laughing-gas-containing feed gas (12). After addition (4) of the exhaust gas (8) from the catalytic decomposition of laughing gas (7), the laughing-gas-containing feed gas (12) is compressed (5) and passed to the heat exchanger (6). In the heat exchanger (6) the laughing-gas-containing feed gas (12) is preheated by heat exchange with the exhaust gas (8). The exhaust gas (8) is cooled in the heat exchanger (6) in this process. The preheated laughing-gas-containing feed gas (12) is passed via a further optional heater (11) as a feed to the catalytic laughing gas decomposition (7). In order to avoid a concentration build-up, some of the exhaust gas (8) is passed out (9) of the process. The exhaust gas (8) is further cooled by a further optional heat exchanger (10). The additional cooling by means of the heat exchanger (10) ensures that subsequent appliances such as the compressor are protected against overheating. By means of the heat exchanger (10), the permissible temperature of that part of the exhaust gas (8) which is released (9) to the atmosphere can also be controlled here. For optimal control of the intake temperature of the laughing-gas-containing feed gas (12) into the catalytic decomposition (7), at least some of the laughing-gas-containing feed gas (12) can bypass the heat exchanger (6) using a bypass (14).
    • 含气味气体(1)通过稀释气体(2)稀释。 稀释气体(2)在干燥器(3)中几乎没有水分。 在通过进料管线(13)进料稀释气体(2)之后,向含笑气的进料气体(12)中加入来自催化分解(7)的废气(8)(4)。 在从气体(7)的催化分解中加入(4)废气(8)后,将含笑气的进料气体(12)压缩(5)并通入热交换器(6)。 在热交换器(6)中,通过与废气(8)的热交换来预热含笑气体的进料气体(12)。 在该过程中,排气(8)在热交换器(6)中被冷却。 预热的含笑气体的进料气体(12)通过另外的任选的加热器(11)作为催化气体分解的进料(7)通过。 为了避免浓度积聚,一部分废气(8)被排出(9)。 废气(8)通过另外的任选的热交换器(10)进一步冷却。 通过热交换器(10)的附加冷却确保了后续的诸如压缩机的设备被保护以免过热。 通过热交换器(10),也可以控制排放到大气中的废气(8)部分的允许温度(9)。 为了将含笑气的进料气体(12)的进气温度最佳控制到催化分解(7)中,至少一些含气味的进料气体(12)可绕过热交换器(6) 使用旁路(14)。