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수소/질소/이산화탄소 혼합기체로부터 전기화학적 수소 분리

Electrochemical H2 Separation from H2/N2/CO2 Mixed Gas

이한규 최호열¹ 최경환² 이태희^†

Han Kyu Lee Ho Yeol Choi¹ Kyoung Hwan Choi² Tae Hee Lee^†

연세대학교 화학공학과, 120-749 서울시 서대문구 신촌동 134 ¹LG 화학기술 연구원, 305-600 대전시 유성구 유성유체국 사서함 61 ²삼성종합기술원, 400-600 수원시 장안구 수원우체국사서함 111

Department of Chemical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea ¹LG Chemical Research Center, P. O. Box 61, Yusong Science Town, Daejeon 305-600, Korea ²Samsung Advanced Institute of Technology, P. O. Box 111, Suwon 400-600, Korea

HWAHAK KONGHAK, February 2003, 41(1), 114-121(8), NONE

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Abstract

양이온 교환막을 이용한 전기화학적 막분리법으로 수소/질소/이산화탄소 혼합기체로부터 수소를 분리하고, 운전조건 변화에 따른 수소의 분리특성, 생성 수소의 순도 및 전력효율을 고찰하였고, 2단 공정을 통하여 수소 순도의 향상 및 질소, 이산화탄소의 투과 특성에 관하여 연구하였다. 운전 온도의 상승에 따라 셀 성능, 수소의 순도, 생성량 및 효율이 증가하였으며, 도입 혼합기체의 압력증가는 생성량 및 효율의 증가를 가져오나, 생성물의 순도를 저하시켰다. 각각 운전조건에 대하여 전류 밀도 300 mA/cm(2)에서 최대 전력효율을 나타내었다. 2단 공정을 통하여 100 mA/cm(2)의 낮은 전류 밀도에서도 33%의 도입기체에서 97.39%의 고순도 수소를 얻을 수 있었다. 이산화탄소의 투과가 질소의 투과보다 더 우세하여 수소의 순도에 더 큰 영향을 미쳤다.

Hydrogen was separated from hydrogen/nitrogen/carbon dioxide mixture gas by electrochemical method using proton exchange membrane. Separation characteristics, product hydrogen purity and power efficiencies were obtained under different operating cell temperatures and feed pressures. The purity of hydrogen was enhanced using two-staged separation process, and the permeation of nitrogen and carbon dioxide was studied. Cell characteristic, hydrogen purity, flux and efficiencies was increased as cell temperature was raised. The increase of feed pressure caused rising of flux and efficiencies, but dropped hydrogen purity. In all cases, power efficiency had the maximum value at 300 mA/cm(2). high purity, 97.39%, can be achieved from low purity feed, 33%, through two-staged separation process at 100 mA/cm(2). The permeability of carbon dioxide was larger than that of nitrogen, so the purity of hydrogen was more affected by carbon dioxide than by nitrogen.

Keywords

Electrochemical Hydrogen Separation Product Purity Power Efficiency Two-Staged Separation Process Gas Permeation

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