JP2003277027A - Method for recovering and purifying nitrous oxide - Google Patents
Method for recovering and purifying nitrous oxideInfo
- Publication number
- JP2003277027A JP2003277027A JP2002076687A JP2002076687A JP2003277027A JP 2003277027 A JP2003277027 A JP 2003277027A JP 2002076687 A JP2002076687 A JP 2002076687A JP 2002076687 A JP2002076687 A JP 2002076687A JP 2003277027 A JP2003277027 A JP 2003277027A
- Authority
- JP
- Japan
- Prior art keywords
- nitrous oxide
- activated carbon
- recovering
- temperature
- purifying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、亜酸化窒素の回収
精製方法に関する。さらに詳しくは、大気中に放出され
る廃ガス中に含まれる亜酸化窒素の回収精製方法に関す
る。TECHNICAL FIELD The present invention relates to a method for recovering and purifying nitrous oxide. More specifically, it relates to a method for recovering and purifying nitrous oxide contained in waste gas released into the atmosphere.
【０００２】[0002]
【従来の技術】近年、亜酸化窒素が二酸化炭素とともに
地球温暖化現象の原因物質となっていること、亜酸化窒
素が成層圏で分解されて有害物質に変換されること、亜
酸化窒素がオゾン層の破壊原因物質となっていること等
が指摘されている。したがって、大気中に放出される廃
ガス中の亜酸化窒素を回収し、リサイクルまたは無害化
処理する必要がある。2. Description of the Related Art In recent years, nitrous oxide has become a causative substance of global warming together with carbon dioxide, nitrous oxide is decomposed in the stratosphere and converted into a harmful substance, and nitrous oxide is an ozone layer. It has been pointed out that it is a substance that causes the destruction of. Therefore, it is necessary to recover the nitrous oxide in the waste gas released into the atmosphere and recycle or detoxify it.
【０００３】廃ガス中の亜酸化窒素を回収するに際し、
例えば、アジピン酸、硝酸、亜酸化窒素等の製造設備等
から大気中に放出される亜酸化窒素を含む廃ガスには、
一酸化窒素や二酸化窒素等が含まれている場合があり、
亜酸化窒素を前記一酸化窒素や二酸化窒素と分離する必
要がある。When recovering nitrous oxide in waste gas,
For example, the waste gas containing nitrous oxide released into the atmosphere from manufacturing facilities such as adipic acid, nitric acid, nitrous oxide, etc.
May contain nitric oxide, nitrogen dioxide, etc.,
It is necessary to separate nitrous oxide from the aforementioned nitric oxide and nitrogen dioxide.
【０００４】従来、亜酸化窒素を一酸化窒素や二酸化窒
素から分離する方法としては、深冷分離法が知られてい
るが、−１５０℃以下の温度で分離する必要があるた
め、エネルギーコストが高く経済的でないという問題が
ある。Conventionally, as a method for separating nitrous oxide from nitric oxide and nitrogen dioxide, a deep-cooling separation method has been known. However, since it needs to be separated at a temperature of −150 ° C. or lower, energy cost is reduced. The problem is that it is not expensive and economical.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、亜酸化窒素
を工業的に安価に回収精製する方法を提供することを目
的とする。An object of the present invention is to provide a method for industrially inexpensively recovering and purifying nitrous oxide.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、上記課題
を解決するために鋭意検討を重ねた結果、少なくとも亜
酸化窒素を含む混合ガスを活性炭に吸着させた後、亜酸
化窒素を活性炭から選択的に脱着させることにより、亜
酸化窒素を工業的に安価に回収精製できることを見出し
た。Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention adsorbed a mixed gas containing at least nitrous oxide onto activated carbon, and then added nitrous oxide to activated carbon. It was found that nitrous oxide can be industrially inexpensively collected and purified by selectively desorbing nitrous oxide.
【０００７】[0007]
【発明実施の形態】本発明においては、まず、少なくと
も亜酸化窒素を含む混合ガスを活性炭に吸着させる。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, first, a mixed gas containing at least nitrous oxide is adsorbed on activated carbon.
【０００８】前記少なくとも亜酸化窒素を含む混合ガス
中に含まれる亜酸化窒素以外の成分としては、特に限定
されず、水素、窒素、ヘリウム、一酸化窒素、二酸化窒
素等が挙げられる。また、混合ガス中に含まれる亜酸化
窒素の濃度は、特に限定されない。The components other than nitrous oxide contained in the mixed gas containing at least nitrous oxide are not particularly limited, and examples thereof include hydrogen, nitrogen, helium, nitric oxide, and nitrogen dioxide. Further, the concentration of nitrous oxide contained in the mixed gas is not particularly limited.
【０００９】前記活性炭としては、例えば、繊維状活性
炭、粒状活性炭、破砕状活性炭、紛状活性炭等の一般に
ガス精製用途に使用される活性炭が挙げられる。これら
の中でも、取扱易さの観点、亜酸化窒素を吸着する際の
圧力損失が少ない観点より繊維状活性炭、粒状活性炭が
好適に用いられる。Examples of the activated carbon include fibrous activated carbon, granular activated carbon, crushed activated carbon, powdered activated carbon and the like, which are generally used for gas purification. Among these, fibrous activated carbon and granular activated carbon are preferably used from the viewpoint of easy handling and low pressure loss when adsorbing nitrous oxide.
【００１０】活性炭の使用量は、活性炭の種類、混合ガ
スの流速等により異なるが、通常、亜酸化窒素１ｍＬに
対して、０．０１〜１ｇであることが望ましい。The amount of activated carbon used varies depending on the type of activated carbon, the flow rate of the mixed gas, etc., but normally it is desirable to be 0.01 to 1 g per 1 mL of nitrous oxide.
【００１１】前記混合ガスを活性炭に吸着させる際の温
度は、−８０〜４０℃、好ましくは−４０〜０℃である
ことが望ましい。活性炭に吸着させる際の温度が−８０
℃未満の場合、冷却に要するエネルギーコストが高く、
経済的でないおそれがある。また、活性炭に吸着させる
際の温度が４０℃を超える場合、亜酸化窒素が活性炭に
吸着する量が減少するおそれがある。The temperature at which the mixed gas is adsorbed on the activated carbon is -80 to 40 ° C, preferably -40 to 0 ° C. The temperature when adsorbing on activated carbon is -80
If it is less than ℃, the energy cost required for cooling is high,
May not be economical. Further, if the temperature for adsorbing to activated carbon exceeds 40 ° C., the amount of nitrous oxide adsorbed on activated carbon may decrease.
【００１２】ここで、前記混合ガス中に一酸化窒素が含
まれている場合、一酸化窒素の一部が、活性炭の表面で
反応し、窒素と二酸化窒素に変換される。一酸化窒素お
よび生成した二酸化窒素は、亜酸化窒素と同様に活性炭
に吸着される。Here, when nitric oxide is contained in the mixed gas, a part of the nitric oxide reacts on the surface of the activated carbon and is converted into nitrogen and nitrogen dioxide. Nitric oxide and produced nitrogen dioxide are adsorbed on activated carbon in the same manner as nitrous oxide.
【００１３】引き続き、活性炭に吸着させた亜酸化窒素
を選択的に脱着させる。Subsequently, the nitrous oxide adsorbed on the activated carbon is selectively desorbed.
【００１４】亜酸化窒素を活性炭から選択的に脱着させ
る方法としては、特に限定されず、窒素ガスまたは不活
性ガスを送入して亜酸化窒素を脱着させる方法；減圧下
で亜酸化窒素を脱着させる方法等が挙げられる。これら
の中でも、設備が簡便で経済的である観点より、減圧下
で亜酸化窒素を脱着させる方法が好適に用いられる。減
圧条件としては５〜４０ｋＰａで行うのが望ましい。The method of selectively desorbing nitrous oxide from activated carbon is not particularly limited, and a method of feeding nitrogen gas or an inert gas to desorb nitrous oxide; desorption of nitrous oxide under reduced pressure And the like. Among these, the method of desorbing nitrous oxide under reduced pressure is preferably used from the viewpoint of simple equipment and economical efficiency. It is desirable that the depressurization condition be 5 to 40 kPa.
【００１５】亜酸化窒素を活性炭から脱着させる際の温
度は、−３０〜０℃、好ましくは−３０〜−５℃である
ことが望ましい。亜酸化窒素を活性炭から脱着させる際
の温度が−３０℃未満の場合、亜酸化窒素が活性炭から
脱着しにくくなり、亜酸化窒素が回収されにくくなるお
それがある。また、亜酸化窒素を活性炭から脱着させる
際の温度が０℃を超える場合、活性炭に吸着されている
亜酸化窒素以外の他の成分が亜酸化窒素とともに脱着す
るおそれがある。The temperature for desorbing nitrous oxide from activated carbon is -30 to 0 ° C, preferably -30 to -5 ° C. If the temperature for desorbing nitrous oxide from activated carbon is lower than -30 ° C, it becomes difficult for nitrous oxide to be desorbed from activated carbon and it may be difficult to recover nitrous oxide. Further, when the temperature for desorbing nitrous oxide from activated carbon exceeds 0 ° C., components other than nitrous oxide adsorbed on activated carbon may be desorbed together with nitrous oxide.
【００１６】かくして得られた、亜酸化窒素は、例え
ば、医療用麻酔薬の原料として使用することができる。
また、公知の方法により無害化処理し、大気中に放出す
ることもできる。The nitrous oxide thus obtained can be used, for example, as a raw material for a medical anesthetic.
Further, it can be detoxified by a known method and then released into the atmosphere.
【００１７】本発明においては、亜酸化窒素を活性炭か
ら選択的に脱着させた後、活性炭に吸着されている全て
の成分を脱着して、活性炭を再生させる。In the present invention, after the nitrous oxide is selectively desorbed from the activated carbon, all the components adsorbed on the activated carbon are desorbed to regenerate the activated carbon.
【００１８】活性炭を再生させる方法としては、特に限
定されず、窒素ガスまたは不活性ガスを送入して活性炭
を再生させる方法；減圧下で活性炭を再生させる方法等
が挙げられる。これらの中でも、設備が簡便で経済的で
ある観点より、減圧下で活性炭を再生させる方法が好適
に用いられる。減圧条件としては５〜４０ｋＰａで行う
のが望ましい。The method of regenerating the activated carbon is not particularly limited, and examples thereof include a method of feeding nitrogen gas or an inert gas to regenerate the activated carbon; a method of regenerating the activated carbon under reduced pressure. Among these, the method of regenerating the activated carbon under reduced pressure is preferably used from the viewpoint that the equipment is simple and economical. It is desirable that the depressurization condition be 5 to 40 kPa.
【００１９】活性炭を再生させる際の温度としては、５
〜２００℃、好ましくは１０〜１５０℃であることが望
ましい。活性炭を再生させる際の温度が５℃未満の場
合、活性炭に吸着されている全ての成分が活性炭から脱
着しにくくなり、活性炭が再生されにくくなるおそれが
ある。活性炭を再生させる際の温度が２００℃を超える
場合、加熱に要するエネルギーコストが高く、経済的で
ないおそれがある。The temperature at which activated carbon is regenerated is 5
It is desirable to be ~ 200 ° C, preferably 10-150 ° C. When the temperature at which activated carbon is regenerated is less than 5 ° C, all the components adsorbed on the activated carbon are less likely to be desorbed from the activated carbon, and the activated carbon may be less likely to be regenerated. If the temperature at which activated carbon is regenerated exceeds 200 ° C., the energy cost required for heating is high, which may be uneconomical.
【００２０】[0020]
【実施例】以下、実施例により本発明をさらに詳しく説
明するが、本発明はこれら実施例のみに限定されるもの
ではない。亜酸化窒素の回収精製には、図１で示す実験
装置を使用した。当実験装置は、混合ガス１、流量計
２、吸着管３、恒温槽４、減圧ポンプ５、ホルダー６、
分析装置７を具備している。吸着管３は、内径１０ｍ
ｍ、長さ３ｍの円筒状で密閉可能なステンレス製であ
り、この吸着管３に活性炭を充填した。また、恒温槽４
により、吸着管３の温度管理を行った。分析装置７は、
窒素、一酸化窒素、二酸化窒素、亜酸化窒素を検出する
ガスクロマトグラフ装置（島津製作所製 商品名：ＧＣ
−１４Ａ 検出器：ＴＣＤ）である。The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The experimental apparatus shown in FIG. 1 was used for the recovery and purification of nitrous oxide. This experimental apparatus consists of a mixed gas 1, a flow meter 2, an adsorption pipe 3, a constant temperature bath 4, a decompression pump 5, a holder 6,
The analyzer 7 is provided. The suction tube 3 has an inner diameter of 10 m
The adsorption tube 3 was made of stainless steel and had a length of 3 m and a length of 3 m, and could be sealed. Also, the constant temperature bath 4
The temperature of the adsorption tube 3 was controlled by. The analyzer 7 is
Gas chromatograph device for detecting nitrogen, nitric oxide, nitrogen dioxide, and nitrous oxide (trade name: GC, manufactured by Shimadzu Corporation)
-14A detector: TCD).
【００２１】実施例１
繊維状活性炭（クラレケミカル社製 商品名：クラクテ
ィブ−２５）６．３ｇを充填した吸着管３を、実験装置
に装着し、吸着管３の温度を−２０℃に保持した。Example 1 An adsorption tube 3 filled with 6.3 g of fibrous activated carbon (Kuraray Chemical Co., Ltd., trade name: Clactive-25) was attached to an experimental apparatus, and the temperature of the adsorption tube 3 was kept at -20 ° C. did.
【００２２】亜酸化窒素＝７．０２体積％、一酸化窒素
＝１０．０８体積％、ヘリウム８２．９体積％の混合ガ
スを６９ｍＬ／分で５０分間送入し、混合ガス中の亜酸
化窒素と一酸化窒素を吸着させた。送入した亜酸化窒素
は２４２ｍＬ、一酸化窒素は３４８ｍＬであった。ま
た、一酸化窒素から変換されて吸着されずに回収された
窒素は５０ｍＬであった。A mixed gas of nitrous oxide = 7.02% by volume, nitric oxide = 10.08% by volume, and helium 82.9% by volume was fed at 69 mL / min for 50 minutes, and nitrous oxide in the mixed gas was fed. And adsorbed nitric oxide. The transferred nitrous oxide was 242 mL and nitric oxide was 348 mL. Further, the amount of nitrogen converted from nitric oxide and recovered without being adsorbed was 50 mL.
【００２３】引き続き、吸着管３の温度を−２０℃に保
持し、減圧ポンプ５を用いて、６．７ｋＰａで１００分
間減圧し、ホルダー６に脱着された亜酸化窒素２１０ｍ
Ｌを回収した。また、回収した亜酸化窒素には、一酸化
窒素から変換されて吸着されずに回収された窒素１６ｍ
Ｌが含まれていた。Subsequently, the temperature of the adsorption tube 3 was kept at -20 ° C., the pressure was reduced to 6.7 kPa for 100 minutes by using the decompression pump 5, and 210 m of nitrous oxide desorbed on the holder 6 was removed.
L was collected. In addition, the recovered nitrous oxide contained 16 m of nitrogen that was converted from nitric oxide and was not adsorbed.
L was included.
【００２４】次いで、ホルダー６を空にした後、吸着管
３の温度を３℃／分で１４０℃まで昇温しながら、減圧
ポンプ５を用いて、６．７ｋＰａで９０分間減圧し、ホ
ルダー６に亜酸化窒素３２ｍＬ、一酸化窒素８４ｍＬ、
一酸化窒素から変換された二酸化窒素１３２ｍＬを脱着
させ、回収することにより、活性炭を再生した。Next, after emptying the holder 6, the temperature of the adsorption tube 3 was raised to 140 ° C. at 3 ° C./minute, and the pressure was reduced at 6.7 kPa for 90 minutes by using the pressure reducing pump 5, and the holder 6 was removed. Nitrous oxide 32mL, nitric oxide 84mL,
The activated carbon was regenerated by desorbing and collecting 132 mL of nitrogen dioxide converted from nitric oxide.
【００２５】実施例２
実施例１で使用した繊維状活性炭６．３ｇを充填した吸
着管３を、再び実験装置に装着し、吸着管３の温度を−
２０℃に保持した。Example 2 The adsorption tube 3 filled with 6.3 g of the fibrous activated carbon used in Example 1 was attached to the experimental apparatus again, and the temperature of the adsorption tube 3 was changed to −.
Hold at 20 ° C.
【００２６】亜酸化窒素＝７．０２体積％、一酸化窒素
＝１０．０８体積％、ヘリウム８２．９体積％の混合ガ
スを６９ｍＬ／分で３０分間送入し、混合ガス中の亜酸
化窒素と一酸化窒素を吸着させた。送入した亜酸化窒素
は１４５ｍＬ、一酸化窒素は２０９ｍＬであった。ま
た、一酸化窒素から変換されて吸着されずに回収された
窒素は２３ｍＬであった。A mixed gas of nitrous oxide = 7.02% by volume, nitric oxide = 10.08% by volume, and helium 82.9% by volume was fed at 69 mL / min for 30 minutes, and nitrous oxide in the mixed gas was fed. And adsorbed nitric oxide. The amount of nitrous oxide fed was 145 mL, and the amount of nitric oxide was 209 mL. In addition, the amount of nitrogen that was converted from nitric oxide and recovered without being adsorbed was 23 mL.
【００２７】引き続き、吸着管３の温度を−２０℃に保
持し、減圧ポンプ５を用いて、６．７ｋＰａで１００分
間減圧し、ホルダー６に脱着された亜酸化窒素１２６ｍ
Ｌを回収した。また、回収した亜酸化窒素には、一酸化
窒素から変換されて吸着されずに回収された窒素１５ｍ
Ｌが含まれていた。Subsequently, the temperature of the adsorption tube 3 was kept at -20 ° C., the pressure was reduced to 6.7 kPa for 100 minutes using the decompression pump 5, and 126 m of nitrous oxide desorbed on the holder 6 was removed.
L was collected. In addition, the recovered nitrous oxide contained 15 m of nitrogen that was converted from nitric oxide and was not adsorbed.
L was included.
【００２８】次いで、ホルダー６を空にした後、吸着管
３の温度を３℃／分で１４０℃まで昇温しながら、減圧
ポンプ５を用いて、６．７ｋＰａで９０分間減圧し、ホ
ルダー６に亜酸化窒素１９ｍＬ、一酸化窒素５９ｍＬ、
一酸化窒素から変換された二酸化窒素７５ｍＬを脱着さ
せ、回収することにより、活性炭を再生した。Next, after emptying the holder 6, the temperature of the adsorption tube 3 was raised to 140 ° C. at 3 ° C./minute, and the pressure was reduced at 6.7 kPa for 90 minutes using the decompression pump 5, and the holder 6 was removed. Nitrous oxide 19mL, nitric oxide 59mL,
The activated carbon was regenerated by desorbing and recovering 75 mL of nitrogen dioxide converted from nitric oxide.
【００２９】実施例３
粒状活性炭（クラレケミカル社製 商品名：４ＧＧ）６
０ｇを充填した吸着管３を、実験装置に装着し、吸着管
３の温度を−２０℃に保持した。Example 3 Granular activated carbon (trade name: 4GG, manufactured by Kuraray Chemical Co., Ltd.) 6
The adsorption tube 3 filled with 0 g was attached to the experimental apparatus, and the temperature of the adsorption tube 3 was kept at -20 ° C.
【００３０】亜酸化窒素＝７．０２体積％、一酸化窒素
＝１０．０８体積％、ヘリウム８２．９体積％の混合ガ
スを６９ｍＬ／分で１００分間送入し、混合ガス中の亜
酸化窒素と一酸化窒素を吸着させた。送入した亜酸化窒
素は４８４ｍＬ、一酸化窒素は６９６ｍＬであった。ま
た、一酸化窒素から変換されて吸着されずに回収された
窒素は１０２ｍＬであった。A mixed gas of nitrous oxide = 7.02% by volume, nitric oxide = 10.08% by volume, and helium 82.9% by volume was fed at 69 mL / min for 100 minutes to supply nitrous oxide in the mixed gas. And adsorbed nitric oxide. Nitrous oxide fed was 484 mL, and nitric oxide was 696 mL. Further, the amount of nitrogen that was converted from nitric oxide and recovered without being adsorbed was 102 mL.
【００３１】引き続き、吸着管３の温度を−２０℃に保
持し、減圧ポンプ５を用いて、６．７ｋＰａで１５０分
間減圧し、ホルダー６に脱着された亜酸化窒素４２１ｍ
Ｌを回収した。また、回収した亜酸化窒素には、一酸化
窒素から変換されて吸着されずに回収された窒素２０ｍ
Ｌが含まれていた。Subsequently, the temperature of the adsorption tube 3 was kept at -20 ° C., and the pressure of the nitrous oxide 421m desorbed on the holder 6 was reduced by using the decompression pump 5 for 150 minutes at 6.7 kPa.
L was collected. The recovered nitrous oxide contained 20 m of nitrogen that was converted from nitric oxide and was not adsorbed.
L was included.
【００３２】次いで、ホルダー６を空にした後、吸着管
３の温度を３℃／分で１４０℃まで昇温しながら、減圧
ポンプ５を用いて、６．７ｋＰａで１２０分間減圧し、
ホルダー６に亜酸化窒素６３ｍＬ、一酸化窒素２０９ｍ
Ｌ、一酸化窒素から変換された二酸化窒素２４４ｍＬを
脱着、回収することにより、活性炭を再生した。Next, after emptying the holder 6, the temperature of the adsorption tube 3 was raised to 140 ° C. at a rate of 3 ° C./minute, and the pressure was reduced for 120 minutes at 6.7 kPa using the decompression pump 5.
63 mL of nitrous oxide, 209 m of nitric oxide in holder 6
Activated carbon was regenerated by desorbing and collecting 244 mL of nitrogen dioxide converted from L and nitric oxide.
【００３３】[0033]
【発明の効果】本発明によれば、亜酸化窒素を工業的に
安価に回収精製する方法を提供することができる。According to the present invention, it is possible to provide a method for industrially recovering and purifying nitrous oxide at low cost.
【図１】本発明の実施例で使用した亜酸化窒素の回収精
製の実験装置の概要を示す図である。FIG. 1 is a diagram showing an outline of an experimental apparatus for recovery and purification of nitrous oxide used in an example of the present invention.
１ 混合ガス ２ 流量計 ３ 吸着管 ４ 恒温槽 ５ 減圧ポンプ ６ ホルダー ７ 分析計 1 mixed gas 2 Flow meter 3 adsorption tube 4 constant temperature bath 5 decompression pump 6 holder 7 Analyzer
Claims (8)
性炭に吸着させた後、亜酸化窒素を活性炭から選択的に
脱着させる亜酸化窒素の回収精製方法。1. A method for recovering and purifying nitrous oxide, which comprises adsorbing a mixed gas containing at least nitrous oxide on activated carbon and then selectively desorbing nitrous oxide from the activated carbon.
である請求項１に記載の亜酸化窒素の回収精製方法。2. The method for recovering and purifying nitrous oxide according to claim 1, wherein the activated carbon is fibrous activated carbon or granular activated carbon.
性炭に吸着させる際の温度が、−８０〜４０℃である請
求項１または２に記載の亜酸化窒素の回収精製方法。3. The method for collecting and purifying nitrous oxide according to claim 1, wherein the temperature at which the mixed gas containing at least nitrous oxide is adsorbed on the activated carbon is −80 to 40 ° C.
る請求項１〜３のいずれか１項に記載の亜酸化窒素の回
収精製方法。4. The method for recovering and purifying nitrous oxide according to claim 1, wherein nitrous oxide is desorbed from the activated carbon under reduced pressure.
度が、−３０〜０℃である請求項１〜４のいずれか１項
に記載の亜酸化窒素の回収精製方法。5. The method for recovering and purifying nitrous oxide according to claim 1, wherein the temperature for desorbing nitrous oxide from activated carbon is −30 to 0 ° C.
活性炭を再生させる請求項１〜５のいずれか１項に記載
の亜酸化窒素の回収精製方法。6. The method for recovering and purifying nitrous oxide according to claim 1, wherein after desorption of nitrous oxide from activated carbon, the activated carbon is regenerated.
載の亜酸化窒素の回収精製方法。7. The method for recovering and purifying nitrous oxide according to claim 6, wherein the activated carbon is regenerated under reduced pressure.
０℃である請求項６または７に記載の亜酸化窒素の回収
精製方法。8. The temperature at which activated carbon is regenerated is 5 to 20.
The method for recovering and purifying nitrous oxide according to claim 6 or 7, which is 0 ° C.
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| JP2002076687A JP2003277027A (en) | 2002-03-19 | 2002-03-19 | Method for recovering and purifying nitrous oxide |
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160098019A (en) | 2015-02-10 | 2016-08-18 | 쇼와 덴코 가부시키가이샤 | Purification process of nitrous oxide |
| JP2018187613A (en) * | 2017-05-02 | 2018-11-29 | 信六 西山 | Regeneration method of fine particle active charcoal, and regeneration device of fine particle active charcoal |
| CN115448810A (en) * | 2022-11-11 | 2022-12-09 | 山东东岳化工有限公司 | Method and system for removing carbon dioxide and nitrous oxide in trifluoromethane |
-
2002
- 2002-03-19 JP JP2002076687A patent/JP2003277027A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160098019A (en) | 2015-02-10 | 2016-08-18 | 쇼와 덴코 가부시키가이샤 | Purification process of nitrous oxide |
| JP2018187613A (en) * | 2017-05-02 | 2018-11-29 | 信六 西山 | Regeneration method of fine particle active charcoal, and regeneration device of fine particle active charcoal |
| CN115448810A (en) * | 2022-11-11 | 2022-12-09 | 山东东岳化工有限公司 | Method and system for removing carbon dioxide and nitrous oxide in trifluoromethane |
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