大氣中二氧化碳之增加主要係由化石燃料大量消耗之結果，二氧化碳會吸收由地球表面反射之紅外線而造成溫度上升、海平面上升等氣候變遷而稱之為”溫室效應”。由氣候綱要公約及京都議定書之協定均可瞭解：此時已屆研究及發展各項減少溫室效應氣體技術之際，而如何降低二氧化碳之最大排放源產生之二氧化碳更為首要之務。
本研究將建立一套去除煙道氣中二氧化碳系統之攪拌槽型式實驗設備，在反應槽氣液相攪拌轉速分別為235 rpm及200 rpm下，以MEA(aq)、DEA(aq)、MDEA(aq)、NH3(aq)、NaOH(aq)及混合醇胺溶液為吸收劑測定各種操作狀況下之吸收速率，以瞭解其較佳之吸收劑及較適之操作條件，並求得此系統的各項反應動力數據。
本研究成果如下：
1.以MEA吸收CO2：
在溫度50 ℃，進氣CO2濃度15% (V/V)，進氣流量2~12 L/min，吸收劑MEA=10~50% (W/W)情況下。結果顯示當氣體流速增加，其吸收速率會隨之增加，但隨著氣體流速增加其改變吸收速率的量會越少。而在不同濃度的吸收劑下，當吸收劑的濃度越高，其吸收速率越快，然在MEA=30%時的吸收速率為最大。
在溫度50 ℃，氣體流量12 L/min，進氣CO2濃度5~20%(V/V) ，吸收劑MEA=10~50% (W/W)的情況下。結果顯示當進氣CO2濃度越高其吸收速率越快，而吸收劑的情形跟上述雷同。
2.改變溫度對MEA吸收CO2的影響：
在溫度為30~70 ℃，氣體流量12 L/min，進氣CO2濃度15%，吸收劑為MEA=10~50% (W/W)情形下。結果顯示當溫度越高其吸收速率會越高，而不同濃度的MEA其情形跟上述雷同。
3.加入NOx、SO2對MEA吸收CO2之影響：
在溫度50℃，氣體流量12 L/min，進氣CO2濃度15%，加入NOx = 300~800 ppm或SO2 = 500~1500 ppm或同時加入NOx=500 ppm + SO2=1000 ppm，吸收劑為MEA=10~50% (W/W)的情形下。其結果顯示加入NOx及SO2後，NOx及SO2的存在會對MEA吸收CO2有降低的作用。
4.比較混合醇胺同時吸收CO2+NOx+SO2之關係：
在溫度50℃，氣體流量12 L/min，進氣CO2濃度15% (V/V) ，NOx = 500 ppm，SO2 = 1000 ppm的情形下，吸收劑為MEA/NH3= 30/1、30/3，MEA/DEA=30/10、30/20，MEA/MDEA=30/5、30/10。其結果顯示，加入NH3有助於吸收速率的增加，同時又抵抗了NOx、SO2對MEA吸收CO2不良的影響，加入越多的NH3吸收CO2效果越好。加入DEA時對MEA吸收CO2有不良的影響，加入越多其反效果越大。加入MDEA時對MEA吸收CO2有不良的影響，加入越多其反效果越大。
5.比較不同吸收劑吸收CO2之關係：
在溫度50℃，氣體流量12 L/min，進氣CO2濃度15% (V/V) 情行下，吸收劑為NH3=0.57~2.51M、NaOH=1~3M、MEA=1.64~4.91M、DEA=0.98~2.93M、 MDEA=0.87~2.62M。其結果為吸收速率的快慢分別為：NH3>MEA>NaOH>DEA>MDEA。
6.由不同吸收劑濃度之MEA(10~50%)吸收不同進流濃度之CO2(5~20%)，中可以得到下面之反應速率關係式。在不同溫度(30~70℃)的操作條件下，我們可以得到活化能、碰撞因子反應速率常速為：
Ea=32.26 Kj/mol A=2.573*105
7.本研究根據SAS軟體回歸求得一經驗式
而各參數對吸收速率之影響程度依序為MEA濃度、二氧化碳進氣濃度、操作溫度、Flow rate、NOx進氣濃度及SO2進氣濃度。

The increase in atmospheric carbon dioxide has primarily resulted from the consumption of fossil fuels for energy. The atmospheric CO2 is transparent to visible light but absorbs infrared radiation returning from the earth. Thus, the atmospheric CO2 may alter the radioactive balance of the earth and raise the global temperature. This so-called “greenhouse effect”could dramatically cause global climatic and environmental changes in precipitation, storm patterns, and increases in sea level.Therefore, it is the time to research and develop technologies for reducing CO2 emissions from energy production system that is the largest source of CO2 emissions.
This study was set up a bench-scale agitated vessel reactor system to removal CO2 in the simulated fuel gas. In reactor, the stir turning of gas phase is 235 rpm and liquid phase is 200rpm. To measure the absorption rate of CO2 at various operating conditions; followed by using MEA(aq); DEA(aq); MDEA(aq); NH3(aq); NaOH(aq) and mixing amine as the additive and absorbent, respectively, to determine the chemical kinetics data.
The result of this study shows the following:
1.The effect of MEA concentration on CO2 absorption rate.
It is conducted condition: temperature 50℃, CO2 concentration 15%(V/V), gas flow rate 2~12 L/min and absorbent MEA =10~50% (w/w). The result shows that the absorption rate goes up by increasing the gas flow rate but the amount of changing absorption rate decrease with increasing the gas flow rate. In different concentration of absorbent condition, the absorption rate goes up by increasing the concentration of absorbent, however, the absorption rate is the fast in MEA=30%.
It is conducted condition: temperature 50℃, CO2 concentration 5~15%(V/V), gas flow rate 12 L/min and absorbent MEA =10~50% (w/w). The result shows that the more higher CO2 inert concentration the more fast absorption rate, and the condition of absorbent is alike the above-mentioned.
2.The effect of operating temperature on CO2 absorption rate.
It is conducted condition: temperature 30~70℃, CO2 concentration 15%(V/V), gas flow rate 12 L/min and absorbent MEA=10~50% (w/w). The result shows that the absorption rate goes up by increasing temperature, and the condition of absorbent is alike the above-mentioned.
3.The effect of NOx and SO2 on CO2 absorption rate.
It is conducted condition: temperature 50℃, CO2 concentration 15%(V/V), gas flow rate 12 L/min, entering NOx=300~800 ppm or SO2=500~1500 ppm or NOx =500 ppm + SO2=1000 ppm and absorbent MEA =10~50% (w/w). The result shows that the absorption rate reduces by entering NOx and SO2.
4.The effect of additives CO2 absorption rate
It is conducted condition: temperature 50℃, CO2 concentration 15%(V/V), gas flow rate 12 L/min, NOx=500 ppm, SO2=10000 ppm and absorbent MEA/NH3 = 30/1, 30/3, MEA/DEA = 30/10, 30/20, MEA/MDEA = 30/5, 30/10. The result shows that entering NH3 can help to increase absorption rate and compete to NOx, SO2 bad affecting for MEA absorb CO2 and the absorption rate increase with increasing NH3 concentration. When liquid was added with DEA or MDEA, it has a bad affecting for MEA absorbing CO2, and the more concentration the bad absorption rate.
5.The effect of absorbent type on CO2 absorption rate.
It is conducted condition: temperature 50℃, CO2 concentration 15%(V/V), gas flow rate 12 L/min, and absorbent concentration NH3=0.57~2.51M; NaOH=1~3M; MEA=1.64~4.91M; DEA=0.98~2.93M; MDEA=0.87~2.62M. The result shows that the absorption rate is NH3>MEA>NaOH>DEA>MDEA.
6.We get the reaction kinetics equation form difference absorbent concentration (MEA=10~50%) absorb difference CO2 concentration (CO2=5~20%).
In difference operating temperature (30~50℃), we can get active energy , factor of colliding and reaction constant equation.
Ea=32.26 Kj/mol A=2.573*105
7.According to the experimental data, we get an regression equation by using the computer program SAS:The sequence of the effect by these factors is MEA concentration, CO2 inert concentration, operating temperature, flow rate, NOx inert concentration and SO2 inert concentration.

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