CN86102646A - Catalysts for the production of carbon dioxide - Google Patents

Abstract

The present invention is activated sodium carbonate solution enrichment and produces CO ₂Composite catalyst.Absorb CO with the aqueous sodium carbonate that contains composite catalyst ₂Can be the CO in the unstrpped gas ₂Take off to below 1%, under same loading condiction, required filling area is than using Na merely ₂CO ₃Aqueous solution absorption process is few, and resolution speed can improve more than 2 times more than one times, and energy-conservation 70% also can simplify production equipment.

Description

The invention is a composite catalyst for enriching and producing _Co2 by activating sodium carbonate solution.

The method of producing Co ₂ in foreign countries is to use potassium carbonate solution to absorb Co ₂ gas in the raw gas. The price of potassium carbonate is high, and it needs to be carried out under high pressure (27kg/cm ² G). This production method has complicated equipment and high cost. The method of domestic production of Co ₂ is to use sodium carbonate solution to absorb Co ₂ in the raw gas. Although the price of sodium carbonate is lower than that of potassium carbonate, the effect of absorbing Co ₂ is not ideal due to the insufficient activity of sodium carbonate.

The composite catalyst of the present invention can activate the sodium carbonate solution to achieve the purpose of better absorbing _Co2 gas.

The details of the present invention are as follows:

The formula of the composite catalyst is ethanolamine: 35-45% monoethanolamine + 25-28.5% diethanolamine + 15.9-18% triethanolamine, plus 2.5-3.5% borax and 3-7% glycine. Add 0.5-2% composite catalyst to 7-12% sodium carbonate solution. Use this solution to treat and purify the raw gas (Co ₂ can be between 7-30%), and the Co ₂ in the raw gas can be removed to less than 1%.

Under the same load conditions, the required packing area is more than twice that of simply using sodium carbonate aqueous solution to absorb _Co2 , while the resolution speed can be increased by more than two times, and the energy saving can reach 70%. Compared with foreign methods of producing _Co2 , the equipment can be simplified . According to the specific situation of traditional production of Co ₂ in our country, there is no need to replace new equipment, just add the composite catalyst of the present invention to the cheap sodium carbonate solution to achieve low production cost and high quality Co ₂ . The use of this composite catalyst can also adjust the production capacity of _Co according to the demand of _the market for Co ₂ . When a large amount of Co is required, the catalyst can be added to the sodium carbonate solution to speed up the production of Co _{2 .} When the demand is small, a small amount of production can be maintained without adding a catalyst.

Composite catalyst effect experiment.

Test conditions: Purify the _Co2 gas in the steel cylinder and enter it into the tank reactor with stirring, and absorb it at 55-70°C at a speed of 80 rpm. The comparison of the obtained absorption speed and resolution speed is as follows:

Claims (2)

1. A composite catalyst for enriching and producing _CO by activating sodium carbonate solution. It is characterized in that the composite catalyst is composed of ethanolamines, and its formula is as follows: 35-45%-ethanolamine + 25-28.5% diethanolamine + 15.9-18% triethanolamine, plus 2.5-3.5% borax and 3-7% glycine. 2. The catalyst as claimed in claim 1 should be used in an amount of 0.5-2% in a 7-12% sodium carbonate solution.