Abstract: There is provided a process of preparing hydrogen through thermochemical decomposition of water capable of supplying a mixture composed of the impalpable powders of CaO and coal directly to a main reactor. The process of preparing hydrogen through thermochemical decomposition of water, wherein coal powders are caused to react with water in the presence of CaO under a condition of temperature in a range of 600° C. to 800° C.
Type:
Grant
Filed:
July 15, 2003
Date of Patent:
March 21, 2006
Assignees:
Center for Coal Utilization, Japan, National Institute of Advanced Industrial Science and Technology
Abstract: Organic materials such as raw refuse, waste plastics, waste biomass, sludges, etc. are decomposed by the use of supercritical water to selectively produce hydrogen. A thermochemical reaction is promoted to reduce the supercritical water and selectively produce hydrogen, without substantially adding any oxidizing agent to the supercritical water of a specific temperature and pressure, in the presence of a carbon dioxide-absorbing substance in an amount sufficient to absorb all of the generated carbon dioxide, so that carbon contained in the organic wastes reduces the supercritical water, and hence the organic materials are completely decomposed and also hydrogen gas is removed.
Type:
Grant
Filed:
April 26, 1999
Date of Patent:
July 4, 2000
Assignees:
Center for Coal Utilization, Japan, Japan as represented by Director General of Agency of Industrial Science and Technology