JPH0373326B2 - - Google Patents
Info
- Publication number
- JPH0373326B2 JPH0373326B2 JP59252232A JP25223284A JPH0373326B2 JP H0373326 B2 JPH0373326 B2 JP H0373326B2 JP 59252232 A JP59252232 A JP 59252232A JP 25223284 A JP25223284 A JP 25223284A JP H0373326 B2 JPH0373326 B2 JP H0373326B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- adsorbent
- acidic
- nitrogen dioxide
- packed bed
- 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.)
- Expired - Lifetime
Links
- 239000007789 gas Substances 0.000 claims description 76
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 53
- 239000003463 adsorbent Substances 0.000 claims description 50
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 claims description 49
- 230000002378 acidificating effect Effects 0.000 claims description 45
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 38
- 238000001179 sorption measurement Methods 0.000 claims description 28
- 239000001569 carbon dioxide Substances 0.000 claims description 19
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 19
- 238000000926 separation method Methods 0.000 claims description 14
- 229910001038 basic metal oxide Inorganic materials 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000010457 zeolite Substances 0.000 claims description 5
- 229910021536 Zeolite Inorganic materials 0.000 claims description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000969 carrier Substances 0.000 claims description 3
- 239000012024 dehydrating agentsâ Substances 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 239000008262 pumice Substances 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 claims 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 23
- 238000000034 method Methods 0.000 description 11
- 239000011787 zinc oxide Substances 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 7
- 239000000395 magnesium oxide Substances 0.000 description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 6
- 229910044991 metal oxide Inorganic materials 0.000 description 6
- 150000004706 metal oxides Chemical class 0.000 description 6
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 238000003795 desorption Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000314 transition metal oxide Inorganic materials 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003729 cation exchange resin Substances 0.000 description 1
- 229940023913 cation exchange resins Drugs 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- UOURRHZRLGCVDA-UHFFFAOYSA-D pentazinc;dicarbonate;hexahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[O-]C([O-])=O.[O-]C([O-])=O UOURRHZRLGCVDA-UHFFFAOYSA-D 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Treating Waste Gases (AREA)
Description
çºæã®ç®ç Purpose of invention
æ¬çºæã¯ã匷é
žæ§ã®äºé
žåçªçŽ ãšåŒ±é
žæ§ã®çé
ž
ã¬ã¹ããã³ïŒãŸãã¯ïŒéé
žæ§ã¬ã¹ãšã®æ··åã¬ã¹äž
ã®äºé
žåçªçŽ ãããšãã°ç©ºæ°äžã«ååšããäºé
žå
çªçŽ ãéžæçã«åžçåé¢ããæ¹æ³ã«é¢ãããæ¬çº
æã¯ãŸããäºé
žåçªçŽ ãçé
žã¬ã¹ããã³éé
žæ§ã¬
ã¹ã®æ··åã¬ã¹äžã®äºé
žåçªçŽ ããã³çé
žã¬ã¹ãã
éžæçã«é次åžçåé¢ããæ¹æ³ã«é¢ããã
The present invention relates to a method for selectively adsorbing and separating nitrogen dioxide in a mixed gas of strongly acidic nitrogen dioxide and weakly acidic carbon dioxide and/or non-acidic gas, such as nitrogen dioxide present in air. The present invention also allows nitrogen dioxide and carbon dioxide in a mixed gas of nitrogen dioxide, carbon dioxide and non-acidic gas to be
This invention relates to a method for selectively sequential adsorption separation.
åŸæ¥ãé
žæ§ã¬ã¹ã«å¯Ÿããåé¢åžçå€ãšããŠã¯ã
ãœãŒãã©ã€ã ïŒååŠçµæCaOã»NaOHïŒãã«æ§ãœ
ãŒããéçé
žãœãŒãïŒNaHCO3ïŒãªã©ã®åŒ·å¡©åº
æ§åžçå€ããŒãªã©ã€ãã掻æ§çãªã©ã®å€åæ§åžç
å€ãçšããããŠããã
ãšãããã匷塩åºæ§åžçå€ã¯ã匷é
žæ§ã®äºé
žå
çªçŽ ãäºé
žåç¡«é»ã ãã§ãªãã匱é
žæ§ã®äºé
žåç
çŽ ãå«ããã¹ãŠã®é
žæ§ã¬ã¹ãåžçããããããã€
ãŠã匷塩åºæ§åžçå€ã§ã¯ã匱é
žæ§ã¬ã¹ãšåŒ·é
žæ§ã¬
ã¹ãšãåé¢ããããšãã§ããªãããã®ããã«ãã
ãšãã°ç¡é
žãã©ã³ããææ©ååç©ã®ãããåå·¥çš
ãªã©ã®æã¬ã¹äžã«å«ãŸããäºé
žåçªçŽ ã®ã¿ãé€
å»ãåé¢ããããšãç®çã®å Žåã§ããå
±åããäº
é
žåççŽ ãåæã«åžçãããã®ã§ãäºé
žåçªçŽ ã«
察ããåžçéãæžå°ããããŸãããœãŒãã©ã€ã ã
éçé
žãããªãŠã ã§é
žæ§ã¬ã¹ãåžçããã®ã¡ã¯ã
åžçããã¬ã¹ã®è±çã«ããååãšåžçå€ã®åçã¯
å°é£ãªã®ã§ããããè¡ãªããã«ãåžçå€ã¯ãã®ãŸ
ãŸå»æ£ããããå€ã®çšéã«åãããããªãããã®
ããã«ã匷é
žæ§ã¬ã¹ã®åžçåé¢å€ãšããŠåŒ·å¡©åºæ§
åžçå€ãçšãããšããã®äœ¿çšå¹çãäœãããŸãã
åžçããã¬ã¹ã®ååã«ããåå©çšã®å¯èœæ§ãä¹ã
ããšããåé¡ããã€ãã
äžæ¹ããŒãªã©ã€ããªã©ã®å€åæ§åžçå€ã§ã¯ãé
ž
æ§ã¬ã¹ã«å¯Ÿããåžçå€åäœééåœãã®åžç容éã
å¡©åºæ§åžçå€ããå°ããããŸãããããã®åžçå€
ã¯ãã¬ã¹ãéç¹ç°çãªç©çåžçã®æ©æ§ã§åžçãã
ããã«ããã®çŽ°åæ§é ã®äžã«åçž®ããããšã®ã§ã
ãã¬ã¹ã¯ãã¹ãŠåžçããŠããŸãããã®ããã«ãå€
åæ§åžçå€ã§ã¯é
žæ§ã¬ã¹ã®ã¿ãéžæçã«åžçãã
ããšãã§ãããå ç±ã«ããè±çããŠãè€æ°ã®ã¬ã¹
ãå
±åããæ··åã¬ã¹ãšãªãã®ã§ãæå¹ãªå©çšãå°
é£ã§ãããšãã€ãåé¡ããã€ãã
Conventionally, as a separation adsorbent for acidic gas,
Strongly basic adsorbents such as soda lime (chemical composition: CaO/NaOH), caustic soda, and bicarbonate of soda (NaHCO 3 ), and porous adsorbents such as zeolite and activated carbon are used. However, strongly basic adsorbents adsorb not only strongly acidic nitrogen dioxide and sulfur dioxide, but also all acidic gases including weakly acidic carbon dioxide. Therefore, a strongly basic adsorbent cannot separate weakly acidic gas and strongly acidic gas. For this reason, even if the purpose is to remove and separate only nitrogen dioxide contained in the exhaust gas from a nitric acid plant or the nitration process of organic compounds, the adsorption of nitrogen dioxide quantity decreases. In addition, after adsorbing acid gas with soda lime or sodium bicarbonate,
Since it is difficult to recover the adsorbed gas by desorption and regenerate the adsorbent, the only option is to dispose of the adsorbent as it is or to use it for various purposes. In this way, when a strong basic adsorbent is used as an adsorption/separation agent for strongly acidic gases, its usage efficiency is low, and
There was a problem that there was little possibility of reusing the adsorbed gas by recovering it. On the other hand, porous adsorbents such as zeolites have a smaller adsorption capacity per unit weight of acidic gas than basic adsorbents. Furthermore, since these adsorbents adsorb gases by a non-specific physical adsorption mechanism, all gases that can be condensed into their pore structures are adsorbed. For this reason, porous adsorbents cannot selectively adsorb only acidic gases, and even when desorbed by heating, a mixture of multiple gases coexists, making it difficult to use them effectively. There was a problem.
æ¬çºæã®ã²ãšã€ã®ç®çã¯ãäžèšã®åé¡ç¹ã解決
ãã匷é
žæ§ã¬ã¹ã§ããäºé
žåçªçŽ ãšã匱é
žæ§ã¬ã¹
ããã³ïŒãŸãã¯ïŒéé
žæ§ã¬ã¹ãšã®æ··åã¬ã¹ããäº
é
žåçªçŽ ãéžæçã«åé¢ããããšãã§ãããŸãã
åžçåé¢ããã¬ã¹ã®è±çååããã³åžçå€ã®åå©
çšã容æãªåžçåé¢æ³ãæäŸããããšã«ããã
æ¬çºæã®ããŸã²ãšã€ã®ç®çã¯ãäºé
žåçªçŽ ãç
é
žã¬ã¹ããã³éé
žæ§ã¬ã¹ã®æ··åã¬ã¹äžã®äºé
žåçª
çŽ ããã³çé
žã¬ã¹ããéžæçã«é次åžçåé¢ãã
æ¹æ³ãæäŸããããšã«ããã
çºæã®æ§æ
One object of the present invention is to solve the above problems and to selectively separate nitrogen dioxide from a mixed gas of strongly acidic nitrogen dioxide and weakly acidic gas and/or non-acidic gas. I can do it, and also.
An object of the present invention is to provide an adsorption separation method that allows easy desorption recovery of adsorbed and separated gases and reuse of adsorbents. Another object of the present invention is to provide a method for selectively and sequentially adsorbing and separating nitrogen dioxide and carbon dioxide in a mixed gas of nitrogen dioxide, carbon dioxide, and non-acidic gas. Composition of the invention
ãåé¡ç¹ã解決ããããã®æ段ã
äžè¬ã«ãå¡©åºåžçå€ã¯é
žæ§ã¬ã¹ãåžçãããã
çºæè
ã¯ãå¡©åºæ§åžçæ§å€ã®äžã§ãå¡©åºæ§åŒ·åºŠã®
匱ãåžçå€ããšãã«é
žåãã°ãã·ãŠã ãé
žåäºé
ããã³é
žåããªãªãŠã ãã匷é
žæ§ã®äºé
žåçªçŽ ã¯
åžçããã匱é
žæ§ã®çé
žã¬ã¹ã¯åžçããªãããšã
èŠåºããã
äžèšã®ãããªç¥èŠã«åºã¥ããŠå®æãããæ¬çºæ
ã¯ããã®åºæ¬çãªæ
æ§ãšããŠã匷é
žæ§ã¬ã¹ã§ãã
äºé
žåçªçŽ ãšã匱é
žæ§ã¬ã¹ã§ããçé
žã¬ã¹ããã³
ïŒãŸãã¯ïŒéé
žæ§ã¬ã¹ãšã®æ··åã¬ã¹ããMgOã
ZnOããã³BeOã®ïŒçš®ãŸãã¯ïŒçš®ä»¥äžãããªã匱
å¡©åºæ§éå±é
žåç©ãäž»äœãšããåžçå€ã«æ¥è§Šã
ããäºé
žåçªçŽ ãéžæçã«åžçããããšãç¹åŸŽãš
ããã
æ¬çºæã®å¥ã®æ
æ§ã¯ã匷é
žæ§ã¬ã¹ã§ããäºé
žå
çªçŽ ãšã匱é
žæ§ã¬ã¹ã§ããçé
žã¬ã¹ããã³éé
žæ§
ã¬ã¹ãšã®æ··åã¬ã¹ããMgOãZnOããã³BeOã®
ïŒçš®ãŸãã¯ïŒçš®ä»¥äžãããªã匱塩åºæ§éå±é
žåç©
ãäž»äœãšããåžçå€ãå
å¡«ãã第ïŒå
å¡«å±€ã«å°å
¥
ããŠãã®æ··åã¬ã¹äžã®äºé
žåçªçŽ ãéžæçã«åžç
åé¢ããã€ãã§ç¬¬ïŒå
å¡«å±€ããæµåºããæ··åã¬ã¹
ã匷塩åºæ§éå±é
žåç©ãäž»äœãšããåžçå€ãå
å¡«
ãã第ïŒå
å¡«å±€ã«å°å
¥ããæ··åã¬ã¹äžã®çé
žã¬ã¹
ãéžæçã«åžçåé¢ããéé
žæ§ã¬ã¹ã第ïŒå
å¡«å±€
ããæµåºãããããšãç¹åŸŽãšããã[Means for solving the problem] Generally, base adsorbents adsorb acidic gases, but
The inventor discovered that among basic adsorbents, adsorbents with weak basic strength, particularly magnesium oxide, zinc oxide, and beryllium oxide, adsorb strongly acidic nitrogen dioxide but not weakly acidic carbon dioxide. Ta. The basic aspect of the present invention, which was completed based on the above findings, is to use a mixed gas of nitrogen dioxide, which is a strongly acidic gas, and carbon dioxide, which is a weakly acidic gas, and/or a non-acidic gas. , MgO,
It is characterized by selectively adsorbing nitrogen dioxide by contacting with an adsorbent mainly composed of a weakly basic metal oxide consisting of one or more of ZnO and BeO. Another aspect of the present invention is to use a mixed gas of nitrogen dioxide, which is a strongly acidic gas, and carbon dioxide, which is a weakly acidic gas, and a non-acidic gas, with a weak base consisting of one or more of MgO, ZnO, and BeO. Nitrogen dioxide in this mixed gas is selectively adsorbed and separated by introducing it into a first packed bed filled with an adsorbent mainly composed of oxidized metal oxides, and then the mixed gas flowing out from the first packed bed is treated with a strong base. It is characterized by introducing the gas into a second packed bed filled with an adsorbent mainly composed of metal oxides, selectively adsorbing and separating carbon dioxide gas in the mixed gas, and causing non-acidic gas to flow out from the second packed bed. .
ãã®çºæã§ã¯ã匱塩åºæ§éå±é
žåç©ãäž»äœãšã
ãåžçå€ãçšããããšã«ãããåžžæž©ã§æ··åã¬ã¹ã®
äžããäºé
žåçªçŽ ãéžæçã«åé¢ãŸãã¯é€å»ãã
ããšãã§ãããããã«å ããŠãäºåå çªçŽ ã®åžç
æéåŸã«åžçå±€ãå ç±ããããšã«ãããåžçãã
ãŠããäºé
žåçªçŽ ãæŸåºãããŠååããåæã«åž
çå€ãåçããããšãã§ããããããã€ãŠãçãš
ãã«ã®ãŒçãçè³æºçãªã¬ã¹ã®åé¢ãå®çŸããã
ãã®å©ç¹ã¯ãåŸæ¥ã空æ°äžã®äºé
žåçªçŽ é€å»æ³ã®
ã²ãšã€ãšããŠè¡ãªãããŠããæ¥è§Šéå
æ³ã§ã¯ãæ¥
觊éå
çšè§Šåªã®å
å¡«å±€ãåžžæ350âååŸã®é«æž©ã«
ä¿ã€å¿
èŠãããããšæ¯èŒããã°ã容æã«ç解ãã
ãã§ãããã
ãŸããæ¥è§Šéå
æ³ã§ã¯äºé
žåçªçŽ ã100ïŒ
é€å»
ããããšãå°é£ã§ããã®ã«å¯Ÿããæ¬çºæã§ã¯ãåž
çå€å
å¡«å±€ãé
žæ§ã¬ã¹ã®é£œååžçã«ããåžçç Žé
ãèµ·ããŸã§ã®æéã¯ãå®å
šã«äºé
žåçªçŽ ãåé¢ã
ãããšãã§ããã
ããã«ãåžžæž©åžçãå©çšããŠå¯åæ§ãæºåž¯æ§ã®
ããè£
眮ãšããŠèšèšããããšãã§ããã®ã§ãå°èŠ
æš¡ã®éå®åžžçãªçšéãžã®å¿çšãå¯èœãšãªãã
In this invention, by using an adsorbent mainly composed of a weakly basic metal oxide, nitrogen dioxide can be selectively separated or removed from a mixed gas at room temperature. In addition, by heating the adsorption layer after the adsorption and collection of the divalent nitrogen, the adsorbed nitrogen dioxide can be released and recovered, and the adsorbent can be regenerated at the same time. Therefore, energy-saving and resource-saving gas separation is realized.
This advantage is simple compared to the conventional catalytic reduction method used as a method for removing nitrogen dioxide from the air, which requires the packed bed of catalyst for catalytic reduction to be kept at a high temperature of around 350°C at all times. will be understood. In addition, while it is difficult to remove 100% of nitrogen dioxide with the catalytic reduction method, in the present invention, the adsorbent packed bed completely removes nitrogen dioxide during the period until adsorption breakthrough occurs due to saturated adsorption of acidic gas. Nitrogen dioxide can be separated. Furthermore, since it can be designed as a highly mobile and portable device by utilizing room-temperature adsorption, it can be applied to small-scale, unsteady applications.
æ¬çºæã§åžçå€ã«çšãã匱塩åºæ§éå±é
žåç©ãš
ããŠã¯ãé
žåãã°ãã·ãŠã ãé
žåäºéããã³é
žå
ããªãªãŠã ã®ïŒçš®ãŸãã¯ïŒçš®ä»¥äžããããã¶ã
äžèšã®è¡šã¯ãçš®ã
ã®éå±é
žåç©ãéå±ã€ãªã³äº€
æäœããã³å€åæ§åžçå€ã®äºé
žåçªçŽ ïŒNO2ïŒ
ã«å¯Ÿããåžçç¹æ§ã枬å®ããçµæã瀺ãããŸãã
第ïŒå³ã¯ããã®æž¬å®è£
眮ã®ïŒäŸã瀺ããçªçŽ ãã³
ãïŒããçªçŽ ã¬ã¹N2ããæµé調ç¯è£
眮ïŒïŒ¡ïŒïŒ
ãéããŠ10mlïŒåã®äžå®æµéã§æãåºãããã®
äžæ¹ãäºé
žåçªçŽ çºçåšïŒã«éããåŸãæ枩槜ïŒ
ïŒ25âïŒã§äž¡è
ãæ··åããŠãNO2æ¿åºŠ0.49ïŒ
ïŒïœïŒïœïŒãšããããã槜å
ã®åžçå€å
å¡«å±€ïŒã«
å°å
¥ããå
å¡«å±€ïŒããæµåºããæ°æµã¯ãªãŒããµã³
ãã©ãŒïŒãåããã¬ã¹ã¯ãããã°ã©ãïŒã«å°å
¥
ããïŒåééã§NO2æŒæŽ©æ¿åºŠã枬å®ããããã«
ãããã®ã§ãåžçå€ã¯ãããã100mgãå
åŸïŒmm
ã®ã¬ã©ã¹ç®¡ã«å
å¡«ããŠçšããã
The weakly basic metal oxide used in the adsorbent in the present invention is selected from one or more of magnesium oxide, zinc oxide, and beryllium oxide. The table below shows the nitrogen dioxide (NO 2 ) concentration of various metal oxides, metal ion exchangers and porous adsorbents.
The results of measuring the adsorption characteristics of Also,
FIG. 1 shows an example of the measuring device, in which nitrogen gas N 2 is supplied from a nitrogen cylinder 1 to flow rate adjusting devices 2A and 2.
B through B at a constant flow rate of 10 ml/min, and after passing one side through nitrogen dioxide generator 3,
Mix both at (25â) to obtain a NO 2 concentration of 0.49%.
(v/v) and introduced into the adsorbent packed bed 5 in the tank, and the airflow flowing out from the packed bed 5 was introduced into a gas chromatograph 7 equipped with an autosampler 6, and the NO 2 leakage concentration was measured at 6 minute intervals. It was designed to measure 100 mg of adsorbent each with an inner diameter of 4 mm.
It was used by filling it into a glass tube.
ãè¡šããtableã
ãè¡šã
è¡šããæãããªããã«ãçš®ã
ã®éå±é
žåç©ã®äž
ã§ã匱塩åºæ§é
žåç©ã§ããé
žåãã°ãã·ãŠã
ïŒMgOïŒãšé
žåäºéïŒZnOïŒã«ãç¹ç°çã«å€§ãã
NO2ã®åžçéãã¿ãããé
žåããªãªãŠã ïŒBeOïŒ
ãããã«æ¬¡ãã§å€§ããªåžçéã瀺ãã
ãããã®éå±é
žåç©ã¯ãæ¯è¡šé¢ç©ãå°ããã
ãšãNO2ã®åžçååæ°ããããã®åºäœäžã§éå±
ååæ°ãã倧ããããšãããNO2ã¯è¡šé¢ã«åžç
ããã ãã§ãªããå
éšãžãåžåããããã®ãšèã
ãããã
ããã«å¯Ÿããä»ã®é·ç§»éå±é
žåç©MnO2ã
V2O5ãCuOãFe2O3ãTiO2ãªã©ãNO2åžçã瀺
ããããã®åžçéã¯å°ãªãããŸãã掻æ§çãã·ãª
ã«ã²ã«ããŒãªã©ã€ããªã©ã®å€åæ§åžçå€ã®NO2
åžçéã¯ããã®æ¯è¡šé¢ç©ã®å€§ããããäºæ³ããã
ãããã¯ããã«å°ãªãã匱塩åºæ§éå±é
žåç©ã®15
ã30ïŒ
çšåºŠã«ãããªããããã«ãéå±æ
æã®éœã€
ãªã³äº€ææš¹èã®å Žåããäžèšã®é·ç§»éå±é
žåç©ãš
åæ§ã«é¡èãªå¹æãã¿ãããªãã
æ¬çºæã§äœ¿çšããå¡©åºæ§éå±é
žåç©ã®åœ¢æ
ã¯ã
åžè²©ã®ç²æ«ç¶ã®è©Šè¬ãããã¯å·¥æ¥çšè£œåããã®ãŸ
ãŸäœ¿çšããŠãå·®æ¯ããªãããé
žæ§ã¬ã¹ãæ°Žèžæ°ã
倧éã«åžçãããšæœ®è§£çŸè±¡ã«äŒŒãå€åãèµ·ããå
填䜿çšãããšãã«ç®è©°ããèµ·ããããåçãå°é£
ã«ãªããããããããããã§ãå¡©åºæ§éå±é
žåç©
ãåç¬ã§é ç²ããã«ããã®æ
äœãšãªããããªåŒ·åº
ãªæ
äœãé ç²çšã®ãã€ã³ããé ç²ããéå±é
žåç©
ã«å€åæ§ã賊äžããããã®è³ŠæŽ»å€ãªã©ãæ·»å ã
ãŠãçç¶ãåæ±ç¶ããã¬ãããªã©ã«é ç²ããå ç±
ãªã©ã®ç±åŠçã«ãã€ãŠçæããã®ã奜ãŸãããã
ã®ãããªæ
äœãšããŠã¯ãé
žåãã¿ã³ãã·ãªã«ã²
ã«ãã¢ã«ãããã·ãªã³ã³ã«ãŒãã€ãã軜ç³ãªã©äž
è¬ã«äœ¿çšãããŠãããã®ãæããããšãã§ããã
次ã«ããã®çºæã«ããé
žæ§ã¬ã¹ã®åžçåé¢æ³ã
å³é¢ãåç
§ããŠå
·äœçã«èª¬æããã
第ïŒå³ã¯ãã®çºæã«ãããMgOãZnOããã³
BeOã®ïŒçš®ãŸãã¯ïŒçš®ä»¥äžãããªã匱塩åºæ§é
å±é
žåç©ãäž»äœãšããåžçå€ïŒä»¥äžãã匱塩åºæ§
åžçå€ããšãããïŒã®ã¿ãçšããæ¹æ³ã瀺ããã
ãªãã¡ã匱塩åºæ§åžçå€ãšããŠãã¬ããç¶ã®é
žå
äºéãå
å¡«ããå
å¡«å±€ã®äžç«¯ããäºé
žåççŽ
ïŒCO2ïŒãšäºé
žåçªçŽ ïŒNO2ïŒãå«ã空æ°ãæµå
¥
ããããšã匷é
žæ§ã¬ã¹ã§ããäºé
žåçªçŽ ã¯å
å¡«å±€
ã«ããåžçæéããã匱é
žæ§ã¬ã¹ã§ããäºé
žåç
çŽ ã¯åžçãããã«ä»ç«¯ãã空æ°ãšãšãã«æŸåºãã
ããäºé
žåçªçŽ ãåžçããé
žåäºéã¯ãæ··å空æ°
ã®æµå
¥åæ¢åŸã450âçšåºŠã«å ç±ããŠæž
æµãªç©ºæ°
ãéããšãäºé
žåçªçŽ ãæŸåºããåžçå€ãšããŠå
çããããšãã§ããã
第ïŒå³ã¯å¡©åºåŒ·åºŠã®ç°ãªãäºçš®é¡ã®åžçå€ãçš
ããæ¹æ³ã瀺ããããªãã¡ãäžèšãšåæ§ã«åŒ±å¡©åº
æ§åžçå€ãšããŠé
žåäºéãå
å¡«ãã第ïŒå
å¡«å±€
ã«ã匷塩åºæ§åžçå€ãšããœãŒãã©ã€ã ãå
å¡«ãã
第ïŒå
å¡«å±€ãçŽåã«æ¥ç¶ãããŠããã第ïŒå
å¡«å±€
ã®å
¥å£åŽããäºé
žåççŽ ãšäºé
žåçªçŽ ãå«ã空æ°
ãæµå
¥ããããšã第ïŒå
å¡«å±€ã§ã¯äºé
žåçªçŽ ãã
第ïŒå
å¡«å±€ã§ã¯äºé
žåççŽ ãããããéžæçã«åž
çåé¢ãã第ïŒå
å¡«å±€ããã¯é
žæ§ã¬ã¹ãå«ãŸãªã
空æ°ãæµåºããã
第ïŒå³ã¯ç¬¬ïŒå³ã®ç¬¬ïŒã第ïŒå
å¡«å±€ã«è±æ°Žå€ãš
å€åæ§åžçå€ãçµåããæ¹æ³ã瀺ããããªãã¡ã
çŽåã«æ¥ç¶ãã第ïŒå
å¡«å±€ã®å
¥å£åŽã«ã¯ç²ç¶ç¡«é
ž
ãããªãŠã ãªã©ã®è±æ°Žå€ãå
å¡«ããè±æ°Žå±€ãã第
ïŒå
å¡«å±€ã®åºå£åŽã«ã¯æŽ»æ§çã®ãããªééžææ§ã®
å€åæ§åžçå€ãå
å¡«ããå±€ããããããæ¥ç¶ããŠ
çšããã
ãã®å Žåã«ã¯ãè±æ°Žå±€åŽãããäºé
žåçªçŽ ãäº
é
žåççŽ ããã³æ°Žèžæ°ã®ã»ãçåæ°ŽçŽ ãããã²ã³
åçåæ°ŽçŽ ãªã©ã®éé
žæ§ææ©ååç©ã®èžæ°ãå«ã
空æ°ãå°å
¥ãããšãæåã«è±æ°Žå±€ã§æ°Žåãé€å»ã
ãã第ïŒããã³ç¬¬ïŒå
å¡«å±€ã§äºé
žåçªçŽ ãäºé
žå
ççŽ ãé 次åžçé€å»ãããã®ã¡ãå€åæ§åžçå±€ã«
ãããŠææ©ç©èžæ°ãåžçé€å»ãããæåŸã®å±€ãã
ã¯é
žæ§ã¬ã¹ãææ©ç©èžæ°ãå«ãŸãªãæž
æµãªç©ºæ°ã
æµåºããããã®ããã«ããŠãé
žæ§ã¬ã¹ãææ©ç©èž
æ°ããé 次éžæçã«åžçåé¢ãããã
ãã®å Žåã«ãã第ïŒå
å¡«å±€ã«ãããŠäžå®éã®äº
é
žåçªçŽ ãåžçããã®ã¡ãæ··å空æ°ã®æµå
¥ãæ¢ã
ãŠç¬¬ïŒå
å¡«å±€ãå ç±ããæž
æµãªç©ºæ°ãå°å
¥ããã
ãšã«ãããäºé
žåçªçŽ ãè±çããåžçå€ãåçã
ãããšãã§ããããŸãã第ïŒå
å¡«å±€ããã³å€åæ§
åžçå€å±€ã«ã€ããŠã¯ãäžèšãšåæ§ã«è±çåçã§ã
ãå Žåãšã䜿çšæžã®åžçå€ãå
å¡«å±€ããåãåº
ããæ°ããåžçå€ãšäº€æããå Žåãããã[Table] As is clear from the table, among various metal oxides, magnesium oxide (MgO) and zinc oxide (ZnO), which are weakly basic oxides, have a particularly large
Adsorption amount of NO 2 is observed, and beryllium oxide (BeO)
Also shows the second largest amount of adsorption. Because these metal oxides have a small specific surface area and the number of NO 2 adsorbed molecules is greater than the number of metal atoms in these solids, NO 2 is not only adsorbed on the surface but also absorbed into the interior. considered to be a thing. In contrast, other transition metal oxides MnO 2 ,
V 2 O 5 , CuO, Fe 2 O 3 , TiO 2 and the like also exhibit NO 2 adsorption, but the amount of adsorption is small. Also, porous adsorbents such as activated carbon, silica gel, and zeolite can reduce NO2
The amount of adsorption is much lower than expected from its large specific surface area, and is
It is only about ~30%. Furthermore, in the case of metal-supported cation exchange resins, no remarkable effect is observed, as in the case of the above-mentioned transition metal oxides. The form of the basic metal oxide used in the present invention is:
Commercially available powdered reagents or industrial products can be used as they are, but if they absorb a large amount of acidic gas or water vapor, a change similar to deliquescence will occur, which may cause clogging when filled and used. Playback may become difficult. Therefore, instead of granulating the basic metal oxide alone, we use a strong carrier, a binder for granulation, an activator to impart porosity to the granulated metal oxide, etc. It is preferable to add it, granulate it into spheres, cylinders, pellets, etc., and ripen it by heat treatment such as heating. Examples of such carriers include commonly used carriers such as titanium oxide, silica gel, alumina, silicon carbide, and pumice. Next, the acid gas adsorption separation method according to the present invention will be specifically explained with reference to the drawings. Figure 2 shows MgO, ZnO and
A method using only an adsorbent (hereinafter referred to as "weakly basic adsorbent") mainly composed of a weakly basic metal oxide consisting of one or more types of BeO is shown. In other words, when air containing carbon dioxide (CO 2 ) and nitrogen dioxide (NO 2 ) is introduced from one end of a packed bed filled with zinc oxide pellets as a weakly basic adsorbent, nitrogen dioxide, a strongly acidic gas, is released. The packed bed adsorbs and collects carbon dioxide, which is a weakly acidic gas, and is released from the other end along with air without being adsorbed. Zinc oxide that has adsorbed nitrogen dioxide can be heated to about 450°C after the inflow of mixed air is stopped and clean air is passed through it to release nitrogen dioxide and regenerate it as an adsorbent. Figure 3 shows a method using two types of adsorbents with different base strengths. That is, similarly to the above, a second packed bed filled with soda lime as a strong basic adsorbent is connected in series to a first packed bed filled with zinc oxide as a weak basic adsorbent. When air containing carbon dioxide and nitrogen dioxide is introduced from the inlet side of the first packed bed, nitrogen dioxide is
In the second packed bed, carbon dioxide is selectively adsorbed and separated, and air containing no acid gas flows out from the second packed bed. FIG. 4 shows a method in which a dehydrating agent and a porous adsorbent are combined in the first and second packed beds shown in FIG. That is,
The inlet side of the first packed bed connected in series is filled with a dehydrating layer filled with a dehydrating agent such as granular sodium sulfate, and the outlet side of the second packed bed is filled with a non-selective porous adsorbent such as activated carbon. The layers are connected and used. In this case, if air containing vapors of non-acidic organic compounds such as hydrocarbons and halogenated hydrocarbons in addition to nitrogen dioxide, carbon dioxide, and water vapor is introduced from the dehydration layer side, water is first removed in the dehydration layer. After nitrogen dioxide and carbon dioxide are sequentially adsorbed and removed in the first and second packed beds, organic vapors are adsorbed and removed in the porous adsorption layer, and from the last layer, clean air containing no acid gas or organic vapors is produced. flows out. In this way, acidic gases and organic vapors are sequentially and selectively adsorbed and separated. In this case as well, after adsorbing a certain amount of nitrogen dioxide in the first packed bed, the inflow of mixed air is stopped, the first packed bed is heated, and clean air is introduced to desorb nitrogen dioxide. The adsorbent can be regenerated. Further, regarding the second packed bed and the porous adsorbent layer, there are cases where desorption and regeneration can be performed in the same manner as described above, and cases where the used adsorbent is taken out from the packed bed and replaced with a new adsorbent.
次ã«ããã®çºæãå®æœäŸã«ããå
·äœçã«èª¬æã
ãããªãã以äžã®èª¬æã«ãããŠãéšã¯éééšãè¡š
ããã
å®æœäŸ ïŒ
é
žåäºé20éšãæ°Žé
žåã¢ã«ãããŠã 10éšããã
ãŠç³ïŒéšãæ··åãã次ã«ãå
šäœãã±ãŒãç¶ã«ãªã
ãŸã§ïŒïŒïŒ10ïŒçšç¡é
žïŒçŽ10éšïŒãå ããããã«
45åéæ··åãããããããã¬ããæŒåºæ©ã§ãã¬ã
ããšãã空æ°äžã§550âãŸã§ææž©ãã550âã600
âã®éã§ïŒæéçŒæãããããããã®ãŸãŸèªç¶ã«
å·åŽããé
žåäºéãäž»äœãšããåžçå€ã調補ã
ãã
ãã®ãã¬ããç¶ã®åžçå€ããå
åŸ20mmã®ã¬ã©ã¹
管ã«é·ã40mmã«å
å¡«ããäºé
žåçªçŽ NO2ïŒ0.49ïŒ
ïŒ
ãå«ã空æ°ãæµéãå€ããŠå°å
¥ãããã®æµåºã¬ã¹
ã®äžéšã第ïŒå³ã«æž¬å®è£
眮ã«æ¥ç¶ããäºé
žåçªçŽ
ã®æŒæŽ©æ¿åºŠã枬å®ããçµæãã€ãã®ãããªçµæã
åŸãã
æ··å空æ°ã®æµé NO2ã®æŒæŽ©æ¿åºŠ ïŒmlïŒåïŒ
ïŒppmïŒ
250 æ€åºãããªã
500 ã
1000 50
2000 350
äžã®çµæããæãããªããã«ãæµé250ã2000
mlïŒåã®ç¯å²ã§ã¯ãNO2ã®æŒæŽ©æ¿åºŠã¯ïŒã
350ppmã§ãããåžçåé¢çã¯åæ¿åºŠïŒ4900ppmïŒ
ã«å¯Ÿãã93ïŒ
以äžã«éããå®çšç䟡å€ã®ããããŠ
é«ãããšããããã
å®æœäŸ ïŒ
å¡©åºæ§çé
žäºé40éšãæ°Žé
žåã¢ã«ãããŠã 10éš
ããã³ç²æ«ç¶ãŒãªã©ã€ã10éšãæ··åããå
šäœãã±
ãŒãç¶ã«ãªããŸã§ïŒïŒïŒ10ïŒçšç¡é
žãå ããŠãã
ãã«æ··åããããããæŒåºãæ圢æ©ã§åçç¶ç²å
ãšããããŒã¿ãªãŒãã«ã³ã®äžã§550âãŸã§ãã€ã
ãææž©ããã次ã«550âã600âã®éã§çŽïŒæéçŒ
æããã®ã¡ãèªç¶ã«å·åŽããé
žåäºéãäž»äœãšã
ãåžçå€ã調補ããã
ãã®åçç¶ç²åãããªãåžçå€ããå®æœäŸïŒãš
åæ§ã«ãå
åŸ20mmã®ã¬ã©ã¹ç®¡ã«40mmã«å
å¡«ããäº
é
žåçªçŽ ã®æ¿åºŠãå€ããŠäžå®æµéïŒ500mlïŒåïŒ
ã§å°å
¥ãããã®æµåºã¬ã¹äžã®äºé
žåçªçŽ ã®æŒæŽ©æ¿
床ã枬å®ããã€ãã®çµæãåŸãã
æ··åã¬ã¹äžã®äºé
žåçªçŽ NO2ã®æŒæŽ©æ¿åºŠ ã®æ¿åºŠïŒïŒ
ïŒ
ïŒppmïŒ
0.01 æ€åºãããªã
0.1 ã
0.5 ã
ãã®ããŒã¿ãæãããªããã«ã0.01ã0.5ã®åº
ãæ¿åºŠç¯å²ã«ããã€ãŠãNO2ã®åææŒæŽ©æ¿åºŠã¯
æ€åºãããªãã»ã©äœãããã®åžçåé¢ç¹æ§ã¯å®å®
ããŠããã
çºæã®å¹æ
ãã®çºæã«ããã°ã以äžèª¬æããããã«ãåžžæž©
ã§äºé
žåçªçŽ ãéžæçã«åžçåé¢ããããšãã§
ããåžçåé¢ãããäºé
žåçªçŽ ã¯å ç±ãªã©ã«ãã
è±çååãå¯èœã§ããããåžåå€ãåçãåå©çš
ã§ããã®ã§ãçãšãã«ã®ãŒããã³çè³æºã®é¢ã§ã
å®çšç䟡å€ãé«ãã
ãŸããåžžæž©ã§åžçåé¢ãããããšãããå¯å
æ§ãæºåž¯æ§ã®ããè£
眮ãšããŠèšèšããããšãã§
ããåæè£
眮ãªã©ã®å°èŠæš¡ãªçšéã«ã圹ç«ã€ã
Next, the present invention will be specifically explained using examples. In addition, in the following description, parts represent parts by weight. Example 1 Mix 20 parts of zinc oxide, 10 parts of aluminum hydroxide, and 1 part of glucose, then add dilute nitric acid (approximately 10 parts) until the whole becomes cake-like (1:10), and then
Mixed for 45 minutes. This is made into pellets using a pellet extruder, heated to 550â in air, and then heated to 550â~600â.
It was baked for 2 hours at â. This was naturally cooled as it was to prepare an adsorbent mainly composed of zinc oxide. This pellet-like adsorbent was filled in a glass tube with an inner diameter of 20 mm to a length of 40 mm, and nitrogen dioxide NO 2 (0.49%) was filled.
The leaked nitrogen dioxide concentration was measured by introducing air containing nitrogen dioxide at different flow rates and by connecting a portion of the effluent gas to the measuring device shown in Figure 1.The following results were obtained. Mixed air flow rate NO 2 leakage concentration (ml/min) (ppm) 250 Not detected 500 ã 1000 50 2000 350 As is clear from the above results, the flow rate is 250 to 2000
In the ml/min range, the leakage concentration of NO2 is 0~
350ppm, and the adsorption separation rate is the original concentration (4900ppm)
However, it reached over 93%, which shows that it has extremely high practical value. Example 2 40 parts of basic zinc carbonate, 10 parts of aluminum hydroxide and 10 parts of powdered zeolite were mixed, and dilute nitric acid was added and further mixed until the whole became cake-like (1:10). This was formed into cylindrical particles using an extruder, and the temperature was slowly raised to 550°C in a rotary kiln. Next, the mixture was calcined at 550°C to 600°C for about 2 hours, and then naturally cooled to prepare an adsorbent mainly composed of zinc oxide. Similar to Example 1, this adsorbent made of cylindrical particles was filled to a depth of 40 mm in a glass tube with an inner diameter of 20 mm, and the concentration of nitrogen dioxide was varied at a constant flow rate (500 ml/min).
The leaked concentration of nitrogen dioxide in the effluent gas was measured, and the following results were obtained. Concentration of leakage concentration of nitrogen dioxide NO 2 in mixed gas (%) (ppm) 0.01 Not detected 0.1 ã 0.5 ã As is clear from this data, the initial leakage of NO 2 over a wide concentration range of 0.01 to 0.5 The concentration is so low as to be undetectable, and its adsorption and separation properties are stable. Effects of the Invention According to the present invention, as explained above, nitrogen dioxide can be selectively adsorbed and separated at room temperature, and the adsorbed and separated nitrogen dioxide can be desorbed and recovered by heating, etc. Since it can also be recycled and reused, it has high practical value in terms of energy and resource conservation. In addition, since adsorption separation occurs at room temperature, it can be designed as a device with good mobility and portability, and is useful for small-scale applications such as analytical devices.
第ïŒå³ã¯çš®ã
ã®åºäœã«ããäºé
žåçªçŽ ã®åžçç¹
æ§ã枬å®ããè£
眮ã®èª¬æå³ã§ããã第ïŒå³ã第ïŒ
å³ããã³ç¬¬ïŒå³ã¯ãããããæ¬çºæã®æ¹æ³ã®å®æœ
æ
æ§ã瀺ã説æå³ã§ããã
ïŒâŠâŠçªçŽ ãã³ããïŒïŒ¡ïŒïŒïŒ¢âŠâŠæµé調ç¯è£
眮ãïŒâŠâŠäºé
žåçªçŽ çºçåšãïŒâŠâŠæ枩槜ãïŒ
âŠâŠåžçå€å
å¡«å±€ãïŒâŠâŠãªãŒããµã³ãã©ãŒãïŒ
âŠâŠã¬ã¹ã¯ãããã°ã©ãã
FIG. 1 is an explanatory diagram of an apparatus for measuring the adsorption characteristics of nitrogen dioxide by various solids. Figures 2 and 3
FIG. 4 is an explanatory diagram showing an embodiment of the method of the present invention, respectively. 1... Nitrogen cylinder, 2A, 2B... Flow rate adjustment device, 3... Nitrogen dioxide generator, 4... Constant temperature bath, 5
... Adsorbent packed bed, 6 ... Auto sampler, 7
âŠâŠGas chromatograph.
Claims (1)
ã§ããçé žã¬ã¹ããã³ïŒãŸãã¯ïŒéé žæ§ã¬ã¹ãšã®
æ··åã¬ã¹ããMgOãZnOããã³BeOã®ïŒçš®ãŸã
ã¯ïŒçš®ä»¥äžãããªã匱塩åºæ§éå±é žåç©ãäž»äœãš
ããåžçå€ã«æ¥è§Šãããäºé žåçªçŽ ãéžæçã«åž
çããããšãç¹åŸŽãšããé žæ§ã¬ã¹ã®åžçåé¢æ³ã ïŒ åŒ±å¡©åºæ§éå±é žåç©ããã¢ã«ãããã·ãªã«ã²
ã«ãé žåãã¿ã³ãã·ãªã³ã³ã«ãŒãã€ãããã³è»œç³
ã®ïŒçš®ãŸãã¯ïŒçš®ä»¥äžã®æ äœã«æ æããŠãªãåžç
å€ãçšããç¹èš±è«æ±ã®ç¯å²ç¬¬ïŒé ã«èšèŒã®é žæ§ã¬
ã¹ã®åžçåé¢æ³ã ïŒ åŒ·é žæ§ã¬ã¹ã§ããäºé žåçªçŽ ãšãåŒ±é žæ§ã¬ã¹
ã§ããçé žã¬ã¹ããã³éé žæ§ã¬ã¹ãšã®æ··åã¬ã¹
ããMgOãZnOããã³BeOã®ïŒçš®ãŸãã¯ïŒçš®ä»¥
äžãããªã匱塩åºæ§éå±é žåç©ãäž»äœãšããåžç
å€ãå å¡«ãã第ïŒå å¡«å±€ã«å°å ¥ããŠãã®æ··åã¬ã¹
äžã®äºé žåçªçŽ ãéžæçã«åžçåé¢ããã€ãã§ç¬¬
ïŒå å¡«å±€ããæµåºããæ··åã¬ã¹ã匷塩åºæ§éå±é ž
åç©ãäž»äœãšããåžçå€ãå å¡«ãã第ïŒå å¡«å±€ã«
å°å ¥ããæ··åã¬ã¹äžã®çé žã¬ã¹ãéžæçã«åžçå
é¢ããéé žæ§ã¬ã¹ã第ïŒå å¡«å±€ããæµåºãããã
ãšãç¹åŸŽãšããé žæ§ã¬ã¹ã®éžæçé次åžçåé¢
æ³ã ïŒ åèšç¬¬ïŒå å¡«å±€ãžã®å°å ¥ã«å ç«ã€ãŠãæ··åã¬
ã¹ãè±æ°Žå€ãå å¡«ããè±æ°Žå±€ãéããã¬ã¹äžã®æ°Ž
åãé€å»ããå·¥çšãå«ãç¹èš±è«æ±ã®ç¯å²ç¬¬ïŒé ã«
èšèŒã®é žæ§ã¬ã¹ã®éžæçé次åžçåé¢æ³ã ïŒ åèšç¬¬ïŒå å¡«å±€ããæµåºããæ··åã¬ã¹ãã掻
æ§çããŒãªã©ã€ããªã©ã®å€åæ§åžçå€ãå å¡«ãã
å±€ã«å°å ¥ããŠææ©ç©ãåžçé€å»ããå·¥çšãå«ãç¹
èš±è«æ±ã®ç¯å²ç¬¬ïŒé ãŸãã¯ç¬¬ïŒé ã«èšèŒã®é žæ§ã¬
ã¹ã®éžæçé次åžçåé¢æ³ã[Claims] 1. A mixed gas of nitrogen dioxide, which is a strongly acidic gas, and carbon dioxide, which is a weakly acidic gas, and/or a non-acidic gas, is made of one or more of MgO, ZnO, and BeO. An adsorption separation method for acidic gases, which is characterized by selectively adsorbing nitrogen dioxide by bringing it into contact with an adsorbent mainly composed of weakly basic metal oxides. 2. Acidic gas according to claim 1 using an adsorbent in which a weakly basic metal oxide is supported on one or more carriers of alumina, silica gel, titanium oxide, silicon carbide, and pumice. adsorption separation method. 3 A mixed gas of nitrogen dioxide, which is a strongly acidic gas, and carbon dioxide gas, which is a weakly acidic gas, and a non-acidic gas is mixed with a weakly basic metal oxide mainly consisting of one or more of MgO, ZnO, and BeO. Nitrogen dioxide in this mixed gas is selectively adsorbed and separated by introducing it into a first packed bed filled with an adsorbent, and then the mixed gas flowing out from the first packed bed is made into a mixture containing mainly strong basic metal oxides. Selective sequential adsorption of acidic gas, which is characterized by introducing the adsorbent into a second packed bed, selectively adsorbing and separating carbon dioxide gas in the mixed gas, and causing non-acidic gas to flow out from the second packed bed. Separation method. 4. Selection of the acidic gas according to claim 3, which includes the step of passing the mixed gas through a dehydration layer filled with a dehydrating agent to remove moisture in the gas prior to introduction into the first packed bed. sequential adsorption separation method. 5. Claim 3 or 4 includes a step of introducing the mixed gas flowing out from the second packed bed into a bed filled with a porous adsorbent such as activated carbon or zeolite to adsorb and remove organic matter. The selective sequential adsorption separation method for acidic gases described.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59252232A JPS61129027A (en) | 1984-11-28 | 1984-11-28 | Adsorptive separation of acidic gas |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59252232A JPS61129027A (en) | 1984-11-28 | 1984-11-28 | Adsorptive separation of acidic gas |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61129027A JPS61129027A (en) | 1986-06-17 |
JPH0373326B2 true JPH0373326B2 (en) | 1991-11-21 |
Family
ID=17234352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59252232A Granted JPS61129027A (en) | 1984-11-28 | 1984-11-28 | Adsorptive separation of acidic gas |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61129027A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2741743B2 (en) * | 1994-11-17 | 1998-04-22 | å·¥æ¥æè¡é¢é· | High temperature separation of carbon dioxide |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5077293A (en) * | 1973-09-14 | 1975-06-24 |
-
1984
- 1984-11-28 JP JP59252232A patent/JPS61129027A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5077293A (en) * | 1973-09-14 | 1975-06-24 |
Also Published As
Publication number | Publication date |
---|---|
JPS61129027A (en) | 1986-06-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4315666B2 (en) | Syngas purification method | |
JP5608184B2 (en) | Zeolite adsorbent, process for obtaining it and use for removing carbonate from gas streams | |
US7455718B2 (en) | Silver-exchanged zeolites and methods of manufacture therefor | |
JP2000033218A (en) | Method and apparatus for psa device using mixture of adsorbent | |
US20050000357A1 (en) | Method of removing mecury from exhaust gases | |
JPH10263392A (en) | Adsorption of carbon dioxide and water and adsorbent | |
US5414201A (en) | Combined sorbent/catalyst system | |
Chang et al. | A high effective adsorbent of NOx: Preparation, characterization and performance of Ca-beta zeolites | |
Cho et al. | LiOH-embedded zeolite for carbon dioxide capture under ambient conditions | |
CN105026313A (en) | Purification of argon through liquid phase cryogenic adsorption | |
US3363401A (en) | Process for the recovery of gaseous sulphuric compounds present in small quantities in residual gases | |
FI111245B (en) | A process for separating ammonia from a gas mixture and using an adsorbent composition for this separation | |
JPS59160534A (en) | Adsorbent for mercury vapor and treatment of mercury vapor-containing gas | |
JP6671204B2 (en) | Gas separation equipment | |
KR100941399B1 (en) | Apparatus and method for processing exhaust gas | |
JPH0549918A (en) | Carbon dioxide adsorbent | |
JP2019512384A (en) | Temperature swing adsorption method | |
JPH0373326B2 (en) | ||
WO2010113173A2 (en) | A barium and potassium exchanged zeolite-x adsorbents for co2 removal from a gas mixture and preparation thereof | |
JPH06296858A (en) | Acid gas absorbent | |
GB2238489A (en) | Adsorption method and apparatus | |
RU2288209C1 (en) | Method of producing methanol | |
JP4438145B2 (en) | Carbon monoxide adsorption separation method | |
RU2040312C1 (en) | Method and apparatus to purify drainage gasses from nitrogen oxides | |
RU2288026C1 (en) | Method of removing methanol vapors from gas mixtures |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |