Thermococcus onnurineus NA1을 이용한 생물학적 수성가스전환 공정에서의 일산화탄소 물질전달 개선을 위한 압력공정 개발

Abstract

Water gas shift reaction of the gas containing carbon monoxide (CO) could be an option for hydrogen production in Korea since there are enormous CO resources attributable to the developed steel industry. However, impurities in steel mill gases and high energy burden make it difficult to apply the metal oxide based catalytic process. On the other hand, microbial water gas shift process using carboxydotrophic hydrogenogenic microoorganisms could be carried out in mild conditions and be robust against toxic compounds such as COS and SOx. Especially, it was reported that Thermococcus onnurineus NA1 possesses outstanding activities of CO dependent hydrogen production comparing with other hydrogenogenic microorganisms and its specific H2 productivity is more than 300 mmol-H2/g-cell/h. One major obstacle for commercialization of microbial water gas shift reaction is regarding the gas transfer since the aqueous solubility of CO is very poor. In order to enhance gas transfer efficiency, there are two approaches. One approach is to increase mass transfer coefficient kLa and another idea is to operate this reaction at high pressure for enhancing gas solubility. In this study, we investigated feasibility of the pressurized system for hydrogen production using T. onnurineus NA1. A series of batch fermentations of T. onnurineus NA1 at different pressure was carried out at 80 oC in microreactors. CO partial pressures have a major ises and high energy burden make it difficult to apply the metal oxide based catalytic process. On the other hand, microbial water gas shift process using carboxydotrophic hydrogenogenic microoorganisms could be carried out in mild conditions and be robust against toxic compounds such as COS and SOx. Especially, it was reported that Thermococcus onnurineus NA1 possesses outstanding activities of CO dependent hydrogen production comparing with other hydrogenogenic microorganisms and its specific H2 productivity is more than 300 mmol-H2/g-cell/h. One major obstacle for commercialization of microbial water gas shift reaction is regarding the gas transfer since the aqueous solubility of CO is very poor. In order to enhance gas transfer efficiency, there are two approaches. One approach is to increase mass transfer coefficient kLa and another idea is to operate this reaction at high pressure for enhancing gas solubility. In this study, we investigated feasibility of the pressurized system for hydrogen production using T. onnurineus NA1. A series of batch fermentations of T. onnurineus NA1 at different pressure was carried out at 80 oC in microreactors. CO partial pressures have a major i