• Title, Summary, Keyword: odorant removal

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A Study on Effective Removal Method of Odorant Smell in Natural Gas using Sodium Hypochlorite (차아염소산나트륨을 이용한 천연가스 부취냄새 효과적 탈취방법 연구)

  • Lim, Hyung-Duk
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.6
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    • pp.154-159
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    • 2018
  • Intentional releases occur frequently during maintenance in gas supplying companies, which may result in unpleasant odors, and the possible mistaken belief of a gas accident. Therefore, this study developed a chemical process for effective odorant removal in natural gas using an active chemical that is released intentionally during maintenance and inspection. To develop an effective treatment process for removing the odorant from released natural gas, the effluent concentrations of the odorant in the released gas were measured after a chemical oxidation reaction with a sodium hypochlorite solution in a compact gas scrubbing equipment newly devised in this study. The device was based on a mixed gas vent after the solution inject odorant in the gas through the energy of the venting gas. The cascade combination of a venturi pipe and mixing chamber was developed to remove the odorant effectively from the purposely-released natural gas using an oxidative reaction between the mercaptan compounds (odorant) and the sodium hypochlorite solution. On the other hand, the developed method could be applied limitedly to a relatively small gas release from a low-pressure source. Further studies will be needed to apply the developed process to a large-scale gas release from a high-pressure source.

Performance of Air Fresher System for the Removal of Various Odorants Released from Foodstuffs

  • Kim, Ki-Hyun;Adelodun, Adedeji A.;Deep, Akash;Kwon, Eilhann E.;Jeon, Eui-Chan;Kim, Yong-Hyun;Jo, Sang-Hee;Lee, Min-Hee;Cho, Sung-Back;Hwang, Ok-Hwa
    • Asian Journal of Atmospheric Environment
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    • v.11 no.1
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    • pp.37-53
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    • 2017
  • The effectiveness of four air fresher (AF) systems was evaluated with respect to their removal efficiencies against offensive odorants. For this purpose, malodorous species were generated by exposing freshly cooked foods emitting odorants with levels moderately above their respective threshold values in a confined room. The deodorization efficiency of the four AF systems was then tested for a period of 30 min by estimating the extent of reduction in odorant levels after the operation of each AF. The removal efficiency of the four AF units against each odorant was evaluated as follows: (1) between AF products from different manufacturers, (2) between odorants and ultrafine particulate matter ($PM_{2.5}$), and (3) between operation and natural degassing. The average sorptive removal of odorants was generally <80% and considered less effective or non-effective relative to $PM_{2.5}$. Further examination of odor reduction, if evaluated in terms of odor indices like odor intensity (OI) and odor activity value (OAV), recorded a mean of 33% and 87%, respectively. The overall results of this study confirmed that all tested AF units were not effective to resolve odor problems created under our testing conditions.

Removal of Odorants by Selective Adsorption from Natural Gas for Protection of Steam Reforming Catalyst in Fuel Cell from Sulfur Poisoning (연료전지용 개질기 촉매의 피독방지를 위한 천연가스 중의 황성분 부취제의 선택적 흡착제거)

  • Oh, Sang-Seung;Kim, Geon-Joong
    • Applied Chemistry for Engineering
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    • v.18 no.4
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    • pp.337-343
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    • 2007
  • The reforming catalyst and the electrodes in fuel cells can be poisoned by the organic sulfur compound which is added as an odorant for checking out the leakage of natural gas, and that makes a big problem of system degradation. In this study, various adsorbents, such as silica, ${\gamma}$-alumina, activated carbon, HZSM-5, Ultra-stable Y zeolite (USY), and beta zeolite (BEA), were utilized to remove tetra-hydrothiophene (THT) and tert-butylmercaptan (TBM), and to confirm the performance in the adsorption of those odorants by using a continuous adsorptive bed. The effects of Si/Al ratio of zeolites, adsorption temperature and the type of balance gas (methane or He) on the adsorption performance in the packed bed have been investigated. In addition, the competitive adsorption between TBM and THT on the adsorbents was also estimated. The result shows that H-type BEA zeolite exhibited the highest adsorption capacity for TBM and THT odorant, and the higher amount of THT was removed adsorptively on the same adsorbent than TBM. The physical and chemical adsorption of those compounds on acid sites of zeolite were confirmed by temperature programmed desorption (TPD) and infrared spectrum (IR) analyses.

Selective Removal of Odorants in Natural Gas by Adsorption on Metal-containing Beta Zeolite Adsorbents (금속함유 베타 제올라이트 흡착제 상에서 LNG가스 내에 부취된 황화합물의 선택적 흡착제거)

  • Oh, Sang-Seung;Kim, Geon-Joong
    • Applied Chemistry for Engineering
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    • v.18 no.5
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    • pp.459-466
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    • 2007
  • In this study, H-type beta zeolites (BEA) having various metals were used as the adsorbent for the removal of sulfur containing odorants. The different adsorbents containing single or bimetals were utilized to investigate the performance in the individual adsorption of TBM and THT odorants or in the competitive adsorption between them by using a continuous adsorptive bed system. The result shows that the pure H-type BEA zeolite exhibited the highest adsorption capacity for TBM compound, but the higher amount of THT was removed and adsorbed on a HBEA adsorbent having Fe, Pd metal and ZnO oxide. In the case of bimetal containing adsorbents, Cu-Zn/HBEA and Fe-Mo/HBEA showed a higher adsorption capacity for TBM.

Removal of Sulfur Compounds from Anaerobic Digestion Gas (혐기성 소화 가스로부터 황화합물의 제거)

  • Choi, Do-Young;Jang, Seong-Cheol;Ahn, Byoung-Sung;Choi, Dae-Ki
    • Applied Chemistry for Engineering
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    • v.19 no.1
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    • pp.31-36
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    • 2008
  • In hydrogen production for fuel cell by reforming ADG, sulfur compounds, odorant in ADG, are detrimental to reforming catalyst and fuel cell electrodes. We prepared alkali metal impregnated activated carbon to remove sulfur compounds in ADG by adsorption. The sulfur breakthrough adsorption capacity was changed depending on the oxygen concentration and relative humidity. Oxygen 0.2 vol% and RH 90% showed the highest sulfur breakthrough capacity. Adsorption characteristics of $H_2S$ on KI impregnated activated carbon were evaluated using dynamic adsorption method in a fixed bed. Based on the results, adsorption tower was designed and field-tested.

Adsorptive Removal of TBM and THT Using Ion-exchanged NaY Zeolites (이온교환된 NaY 제올라이트를 이용한 TBM와 THT의 흡착제거)

  • Jung, Gap-Soon;Lee, Seok-Hee;Cheon, Jae-Kee;Choe, Jae-Wook;Woo, Hee-Chul
    • Clean Technology
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    • v.15 no.1
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    • pp.60-66
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    • 2009
  • Adsorptive removal of tetrahydrothiophene (THT) and tert-butylmercaptan (TBM) that were widely used sulfur odorants in pipeline natural gas was studied using various ion-exchanged NaY zeolites at ambient temperature and atmospheric pressure. In order to improve the adsorption ability, ion exchange was performed on NaY zeolites with alkali metal cations of $Li^+,\;Na^+,\;K^+$ and transition metal cations of $Cu^{2+},\;Ni^{2+},\;Co^{2+},\;Ag^+$. Among the adsorbents tested, Cu-NaY and Ag-NaY showed good adsorption capacities for THT and TBM. These good behaviors of removal of sulfur compound for Cu-NaY and Ag-NaY zeolites probably was influenced by their acidity. The adsorption capacity for THT and TBM on the best adsorbent Cu-NaY-0.5, which was ion exchanged with 0.5 M copper nitrate solution, was 1.85 and 0.78 mmol-S/g at breakthrough, respectively. It was the best sulfur capacity so far in removing organic sulfur compounds from fuel gas by adsorption on zeolites. While the desorption activation energy of TBM on the Cu-NaY-0.5 was higher than NaY zeolite, the difference of THT desorption activation energy between two zeolites was comparatively small.

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