| 摘要 |
<p>A novel process of capturing and utilization of carbon dioxide from flue gases as a method of reducing the level of carbon dioxide emissions into the atmosphere is disclosed. The carbon dioxide is first chemically captured directly from the emission stream and then transformed into valuable commercial commodities. The capturing process comprises in passing the stream of flue gas through a reactor packed with a bed of capturing agent selected from the group consisting of calcium hydroxide, magnesium hydroxide, iron hydroxide and combinations thereof, at a temperature from about 200.degree. C to about 400.degree. C, a pressure of about 1 atmosphere to about 10 atmosphere and gas hourly space velocity from about 1000 h-1 to about 10,000 h1. If desired, CO2 from the flue gas stream can first be separated by a membrane separator and then reacted with capturing agent. The said calcium hydroxide and magnesium hydroxide as capturing agents are synthesized from the group of abundantly available materials consisting of chloride salts of calcium and magnesium of sea water, fluorite/fluorspar (CaF2) mineral and apatite/rock phosphate (impure Ca3(PO4)2) mineral. Iron hydroxide in ferrous form as capturing agent is synthesized from haematite ore of iron present in abundance in earth's crust. The process of transforming the chemically captured carbon dioxide to valuable products is carried out by mixing the said chemically captured CO2 material with a suitable binding agent to form a plastic-like substance which is then compression molded in a pellet press or in an extruder to form mechanically strong, thermally stable and environmentally friendly articles of desired shapes and sizes having numerous potential domestic and engineering applications, enabling a permanent fixation of carbon dioxide.</p> |
