Process and system for capturing carbon dioxide from a gas stream

A carbon dioxide, gas flow technology, applied in chemical instruments and methods, separation methods, preparation of carbonate/acid carbonate, etc., can solve problems such as difficulty in ammonia recovery

Inactive Publication Date: 2014-08-06
理查德·J·洪威克
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, ammonia recovery becomes more difficult when the conversion of metallosilicates to carbonates and silica is incomplete in pipelines or other reactors because the thermal treatment employed The decomposition of ammonium hydrogen produces a large amount of carbon dioxide

Method used

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  • Process and system for capturing carbon dioxide from a gas stream
  • Process and system for capturing carbon dioxide from a gas stream
  • Process and system for capturing carbon dioxide from a gas stream

Examples

Experimental program
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preparation example Construction

[0171] Preparation of Ammonium Chloride

[0172] The amount of ammonium chloride required to make up for all the anions lost in the final carbonate mineral can be calculated according to figure 2 The described method is prepared from brine.

[0173] figure 2 The method shown is very similar to that used for the preparation of sodium bicarbonate (NaHCO 3 ), the ammonia-base or Solvay process has been used commercially for over 150 years. However, when applied to method 100, such as figure 2 As indicated, combine saturated or nearly saturated sodium chloride brine with Figure 1A and 1B The main circulation stream shown is mixed with an appropriate amount of ammonium carbonate solution 51 discharged. This mixture is used as CO 2 Absorption tower 50 (which is similar to Figure 1A CO in 2 The scrubbing medium in the absorption tower 30). Carbon dioxide obtained first from the decomposition of sodium bicarbonate in the bicarbonate dryer 57, if necessary by flue gas emis...

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Abstract

A process and system are disclosed for capturing carbon dioxide from a gas stream. The process and system comprises a first reactor in which a slurry of a metal silicate is reacted together with an ammonium salt in aqueous solution. The salt is one that does not form a precipitate with the metal silicate. In the first reactor the metal silicate reacts with the solution to produce a slurry of silica in an aqueous solution of a salt of the metal and ammonia. Ammonia gas is drawn off directly from the first reactor, and ammonia, including the ammonia drawn off from the first reactor, is added to the gas stream. The process and system also comprises scrubbing the gas stream, including with the added ammonia, with an aqueous solution, whereby the carbon dioxide and ammonia are absorbed into the solution and ammonium carbonate salt(s) are produced.

Description

technical field [0001] A method and system for capturing carbon dioxide from a gas stream are disclosed. The gas stream can be flue gas originating from coal-fired power plants or from other point sources such as power plants burning other fossil fuels including natural gas, as well as steel mills, cement plants and refineries including oil and metals other industrial uses of carbon dioxide, or from the combustion of other carbonaceous fuels, including biomass-derived fuels such as alcohols, agricultural residues and biogas. Background technique [0002] There is increasing emphasis on reducing emissions of carbon dioxide into the atmosphere to help minimize the effects of global warming. Carbon dioxide is deposited naturally, including from the weathering of silicate rocks to form carbonates, and in oceans around the globe. Plants are also an efficient form of carbon dioxide sequestration, using photosynthesis to remove carbon from the atmosphere by absorbing it into livi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/62B01D53/14B01J19/00C01B31/20C01B31/24C01C1/26C01C1/16C01C1/24C01B32/50C01B32/60
CPCB01D2251/2062C01B31/0438B01D2258/0233C01D7/26B01D2251/304C01C1/26B01D53/80B01D2251/604B01D2258/025Y02C10/06Y02C10/04B01D53/62C01D7/123B01D53/96B01D2251/206B01D2258/0283B01D2251/108B82Y30/00B82Y40/00Y02P20/151Y02C20/40
Inventor 理查德·J·洪威克
Owner 理查德·J·洪威克
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