• Title/Summary/Keyword: hydrogen extraction

Search Result 160, Processing Time 0.02 seconds

Establishment of Korea Gas Safety Standards for Hydrogen Appliance Inspection in Accordance with Hydrogen Law (수소법에 따른 수소용품 검사시행에 대비한 기술기준 제정)

  • Jung, Jae-Hwan;Kim, Wan-Jin
    • Journal of the Korean Institute of Gas
    • /
    • v.25 no.6
    • /
    • pp.80-84
    • /
    • 2021
  • As the Hydrogen law was enacted, 4 types of hydrogen appliances were designated as inspection products. The types of hydrogen appliances are water electrolysis equipment, hydrogen extraction equipment, stationary fuel cells, and mobile fuel cells. The establishment fo safety standards for hydrogen appliance inspection defines risk factors for each hydrogen appliance and stipulates safety standards to prevent risk factors. The main safety standards for each hydrogen appliance are hydrogen quality and safety control for water electrolysis, toxic substances emission prevention and carbon monoxide emission prevention for hydrogen extraction facilities, vibration safety for mobile fuel cells.

Sulfuric Acid Leaching of Valuable Metals from Spent Petrochemical Catalyst using Hydrogen Peroxide as a Reducing Agent

  • Park, Kyung-Ho;Sohn, Jeong-Soo;Kim, Jong-Seok
    • Proceedings of the IEEK Conference
    • /
    • 2001.10a
    • /
    • pp.478-481
    • /
    • 2001
  • The spent petrochemical catalyst used in the manufacturing process of terephthalic-acid contains valuable metals such as cobalt and manganese. To recover these metals, sulfuric acid leaching was performed with hydrogen peroxide as a reducing agent. Low extractions of Mn, Co and Fe were obtained by sulfuric acid leaching without reducing agent. With adding hydrogen peroxide as a reducing agent, the high extraction of these metals could be obtained. Different from general leaching experiment, the extraction rates of metal components were decreased with increasing reaction temperature in this case. Under the optimum condition, the extraction rates of Mn, Co and Fe were 93.0%, 87.0% and 100% respectively.

  • PDF

Effect of deep eutectic solvent (DES) on the extraction of asiaticoside and madecassoside from Centella asiatica (병풀(Centella asiatica)로부터의 asiaticoside와 madecassoside의 추출효율에 미치는 DES의 영향)

  • Jaeyeong Choi;Yuim Jeon;Sung Ho Ha
    • Analytical Science and Technology
    • /
    • v.36 no.3
    • /
    • pp.128-134
    • /
    • 2023
  • Centella asiatica (C. asiatica) extracts, including asiaticoside and madecassoside, are used in ointments to treat the wound and atopic dermatitis due to their antibacterial and skin-regenerating effects in Asia. Therefore, research on the cultivation and extraction efficiency of C. asiatica is being actively conducted to increase commercialization efficiency. In this study, various deep eutectic solvents (DESs) were prepared and used as the extraction solvents according to the mole ratio between the hydrogen bond acceptor (HBA) and hydrogen bond donor (HBD). And then, the extraction yields in distilled water (DW) and methanol (MeOH), commonly used extraction solvents for C. asiatica, were compared and analyzed by HPLC in the optimized operating condition. As a result, a mixture of DW and DES at a ratio of 3:7 showed about 1.4 times higher extraction efficiency than MeOH only. Conversely, the extraction efficiency in a mixture of MeOH and DES at a ratio of 3:7 was about 6 % lower than that in MeOH only.

Sulfuric Acid Leaching of Valuable Metals from Spent Petrochemical Catalyst using Hydrogen Peroxide as a Reducing Agent (石油化學 廢觸媒로부터 過酸化水素를 還元劑로이용한 有價金屬의 황산침출)

  • 박경호;손정수;김종석
    • Resources Recycling
    • /
    • v.10 no.2
    • /
    • pp.20-26
    • /
    • 2001
  • Sulfuric acid leaching of Mn, Co and Fe from spent petrochemical catalyst was performed using hydrogen peroxide as a reducing agent. Low extraction of Mn, Co and Fe was obtained by only sulfuric acid. When hydrogen peroxide were added as a reducing agent, the high extraction of these metals could be obtained. Different from ordinary leaching, the extraction per-centages of metal components decreased with elevating leaching temperature in this process. Under the optimum condition, the extraction percentages of Mn, Co and Fe were 93.0% , 87.0% and 100% respectively.

  • PDF

$H^-$ Stripping Simulation with a Magnet and $H^{\circ}$ Beam Extractor Design

  • Ahn, Hyo-Eun
    • Proceedings of the Korean Nuclear Society Conference
    • /
    • 1998.05b
    • /
    • pp.951-956
    • /
    • 1998
  • The beam extraction system for the KOMAC[1] (Korea Multi-purpose Accelerator Complex) project is to be designed to partially extract H ̄ beam at both 100 and 260 MeV This paper describes a simulation study of charge changing extraction with a stripper magnet and a possible design of a H$^{0}$ extractor by utilizing the simulation study The method consists of converting the negative hydrogen (H ̄) ion beam from the linac to a chosen intensity (0-100%) of neutral hydrogen (H$^{0}$ ) beam having an acceptable omittance and drifting it directly onto a stripper foil followed by a downstream beamline.

  • PDF

Antioxidative Activity of Cornus officianalis Extracts Obtained by Four Different Extraction Techniques (산수유 추출방법에 따른 항산화 기능 분석)

  • Park, Eun-Bi;Kim, Hye-Sun;Shin, So-Yun;Ji, In-Ae;Kim, Ji-Hyun;Kim, Sung-Goo;Yoo, Byung Hong;Kim, Byung-Woo;Kwak, Inseok;Kim, Moon-Moo;Chung, Kyung Tae
    • Journal of Life Science
    • /
    • v.22 no.11
    • /
    • pp.1507-1514
    • /
    • 2012
  • Oxidative stress leads to damage in all components of the cell, including proteins, lipids, and DNA due to imbalance between reactive oxygen species production and cellular detoxification. Phytochemicals are well-known to contain antioxidants, and their physiological role has been intensively studied. The fruit of Cornus officianalis has been used in oriental medicine and has been reported to have many functions. In this study, four different extraction techniques were applied to extract functional components from the fruit of Cornus officianalis, and the content of loganin, which is an antioxidant having DPPH radical and hydrogen peroxide scavenging activity and reducing power, was analyzed in each extract. Extraction techniques employed in this study were heat extraction by water, 70% ethanol extraction, enzyme treatment, and combination of enzyme treatment and heat extraction by water. All extracts contained 11.8-18.0 mg/g loganin and showed antioxidation function assayed by measuring DPPH radical and hydrogen peroxide scavenging activity and reducing power. Among them, heat extraction was the most effective technique, showing a maximum amount of loganin (18.0 mg/g) and antioxidative activity at 100 mg/ml concentration. Each extract showed very low cytotoxicity up to at 500 mg/ml but 10-20% cytotoxicity at 1,000 mg/ml by in vitro MTT assay.

High Durability of Stack for Automobile (차량용 스택 고출력 내구성능)

  • Kim, Young-Min;Lee, Jong-Hyun;Yoon, Jong-Jin;Cho, Jang-Ho
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2007.06a
    • /
    • pp.557-560
    • /
    • 2007
  • The durability of 80 kW class stack module was tested in hydrogen recirculation and non-recirculation systems with the condition of 300Amps (constant current mode) and hydrogen pulse purging (10 seconds close/0.8 seconds open). A localized membrane failure in the interfacial area between membrane and sub-gasket, carbon corrosion in cathode electrode, and Pt dissolution/extraction have been found through the post mortem analysis such as CV, Impedance, SEM, and so on. The main reason of these mechanisms will be discussed in this study.

  • PDF

Determination of Total Phenolic Compounds from the Fruit of Rubus coreanum and Antioxidative Activity (복분자 열매의 총 페놀성분의 정량 및 항산화 활성)

  • 이종원;도재호
    • Journal of the Korean Society of Food Science and Nutrition
    • /
    • v.29 no.5
    • /
    • pp.943-947
    • /
    • 2000
  • The purpose of this study was to investigate the extraction method of phenolic compounds from Rubus coreanum and antioxidative activity. antioxidative activities of Rubus coreanum were tested with ability of donating hydrogen to DPPH, and HPLC, fluorometry which measure the amount of MDA after reacting linoleic acid with $H_2O$$_2$, and LDL with $H_2O$$_2$ and FeCl$_2$. The most suitable extraction conditions of the phenolic compounds from Rubus coreanum was 3 times with 60% ethanol, and the yield of extract containing 35% moisture was 15.28%. In extraction efficacy of phenolic compounds, 60% ethanol was superior to water as extraction solvent, and extraction efficacy with 60% ethanol did not differ from disolving by water after evaporation of 60% ethanol extract. 60% ethanol extract of Rubus coreanum had an ability of hydrogen donating to DPPH, MDA determination showed the antioxidative effect with inhibition ratio of 77.91% on linoleic acid oxidation by addition of Rubus coreanum extract with the concentration of 1.500 ppm. and about 65.74% of LDL oxidation was inhibited by addition of 1,000 ppm.

  • PDF

A World Trend of Hydrogen Energy Policy and Patent Analysis on the Hydrogen Compressor (수소 에너지 정책의 세계동향 및 수소 압축기의 특허분석)

  • Shim, Kyu-Jin;Kong, Tae-Woo;Lee, Yong-Hun;Chung, Han-Shik;Jeong, Hyo-Min
    • Proceedings of the SAREK Conference
    • /
    • 2005.11a
    • /
    • pp.179-185
    • /
    • 2005
  • Nowadays, study about hydrogen fuel which consist of hydrogen extraction process, reforming, fuel cell equipment, and receptacle are flourish all over the world. Currently, Korea hydrogen station is still underdevelopment. Yet the most important part such as hydrogen compressor has not been develop. Therefore, if the high pressure compressor for hydrogen have been developed by domestic technology. In the future many benefit can be gain instead of importing. Such as many hydrogen station can be built in Korea, and also Korea will be able to provide hydrogen system for worldwide. This study is going to analysis hydrogen compressor in order to store high pressure hydrogen. This is almost approach practical use of tile hydrogen storage method.

  • PDF

The Present Condition and Outlook of Hydrogen Industry in Alberta, Canada (캐나다 앨버타주의 수소산업 현황 및 전망)

  • Moon, Bryan;Lee, Wonsuk;Lee, Youngsoo
    • Journal of the Korean Institute of Gas
    • /
    • v.25 no.1
    • /
    • pp.1-6
    • /
    • 2021
  • Based on Korea's Hydrogen Economy Activation Roadmap, an annual supply of 5.26 million tonnes of hydrogen is required by 2040. But if the hydrogen production from byproduct, extraction, and electrolysis of water is not able to meet the target which is 50% of total production, it would be necessary to increase the portion of imported hydrogen. Therefore, it is essential to secure a variety of sources for overseas production. In this technical report, hydrogen production/transportation policies, current condition, and future prospects of Canada, a major supply candidate, is examined and an example of blue hydrogen project which is considered the most realistic hydrogen supply method is introduced.