Evaluation of carbon dioxide absorption by amine based absorbent

AbstractToshiba has developed amine based aqueous solution (Toshiba solvent 1, TS-1) that can significantly reduce CO2 regeneration energy compared with general 30 wt% monoethanolamine (MEA) aqueous solution and reported the results of the pilot plant of 10 t- CO2/day recovery from the flue gas of a coal- fired power plant. In order to reduce the CO2 regeneration energy further, we have developed new hindered amine based absorbent, Absorbent-A.In the present work, Absorbent-A was evaluated for CO2 absorption properties by laboratory scale apparatus. Absorbent-A was found to have the high CO2 absorption capacity and the low reaction heat. Furthermore, the CO2 regeneration energy of Absorbent-A was 45% less than that of general 30 wt% MEA aqueous solution.In future, we will additionally evaluate Absorbent-A in order to test in the pilot plant

Development of Hindered New Amine Absorbents for CO2 Capture

AbstractAqueous solution containing sterically hindered amine represents candidate solvents having good potential for carbon dioxide (CO2) capture. In the present work, the CO2 reaction with amine-X having sterically hindered substituents in aqueous solution (absorbent-X) is investigated by laboratory scale apparatus. Absorbent-X was found to have the high CO2 cyclic capacity and the low CO2 release temperature. Furthermore, the CO2 regeneration energy of absorbent-X was 45% less than that of general 30 wt% MEA aqueous solution. We will evaluate the absorbent-X at Mikawa pilot plant (10 ton-CO2/day recovery) owned by Toshiba Corp. using the actual flue gas from Mikawa coal fired power plant in Fukuoka prefecture, Japan

Chemopreventive effects of silymarin against 1,2-dimethylhydrazine plus dextran sodium sulfate-induced inflammation-associated carcinogenicity and genotoxicity in the colon of gpt delta rats

Silymarin, a natural flavonoid from the seeds of milk thistle, is used for chemoprevention against various cancers in clinical settings and in experimental models. To examine the chemopreventive mechanisms of silymarin against colon cancer, we investigated suppressive effects of silymarin against carcinogenicity and genotoxicity induced by 1,2-dimethylhydrazine (DMH) plus dextran sodium sulfate (DSS) in the colon of F344 gpt delta transgenic rats. Male gpt delta rats were given a single subcutaneous injection of 40 mg/kg DMH and followed by 1.5% DSS in drinking water for a week. They were fed diets containing silymarin for 4 weeks, starting 1 week before DMH injection and samples were collected at 4, 20 and 32 weeks after the DMH treatment. Silymarin at doses of 100 and 500 p.p.m. suppressed the tumor formation in a dose-dependent manner and the reduction was statistically significant. In the mutation assays, DMH plus DSS enhanced the gpt mutant frequency (MF) in the colon, and the silymarin treatments reduced the MFs by 20%. Silymarin also reduced the genotoxicity of DMH in a dose-dependent manner in bacterial mutation assay with Salmonella typhimurium YG7108, a sensitive strain to alkylating agents, and the maximum reduction was >80%. These results suggest that silymarin is chemopreventive against DMH/DSS-induced inflammation-associated colon carcinogenesis and silymarin might act as an antigenotoxic agent, in part