Abstract

With aqueous ammonia in the process of CO2 absorption and desorption to join sodium bicarbonate, the influence of HCO3- on CO2 absorption and desorption from ammonia solution was investigated through the experimental analysis of the desorption quantity of CO2, desorption rate, CO2 loading and the absorption rate. The experimental results showed that, in experimental conditions, The desorption rate decreased gradually with increasing ammonia concentrations. The desorption rate increased 12%, 17%, 19% and 28.8% when 1 mol/L of ammonia solution is added in 0.1 mol/L, 0.3 mol/L, 0.5 mol/L and 1 mol/L of sodium bicarbonate. The higher concentration of ammonium bicarbonate solution which was added sodium bicarbonate,the more observably the effect of CO2 desorption was promoted. The absorption rate had dropped when absorption process added 0.3 mol/L sodium bicarbonate, the CO2 loading was a little change.

Highlights

  • As the rapid development of modern industry, a large number of the use of fossil fuels leads to increased CO2 emissions, and CO2 is climate change and the main cause of global warming

  • Liu Fang[9] researched the process of CO2 desorption from ammonium bicarbonate, Zeng Qing[10] studied the characteristics of CO2 desorption from Carbonated ammonia solution, which showed that desorption rate was influenced by temperature, CO2 loading

  • This paper studied the influence of HCO3- on CO2 absorption and desorption from ammonia solution which keep the concentration of NH4HCO3 ⇔ (NH4)+ the same and change the solution of HCO3- concentraon

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Summary

Introduction

As the rapid development of modern industry, a large number of the use of fossil fuels leads to increased CO2 emissions, and CO2 is climate change and the main cause of global warming. The chemical absorption capture of CO2 has been studied and widely used as a reliable and cost-efficient method for CO2 because of its characteristics such as higher absorption rate, higher CO2 recovery rate, no absorbent degration and lower desorption energy requirement, etc[2]. Compared with MEA, aqueous ammonia which has higher CO2 loading capacity (g CO2 absorbed per g absorbent), no corrosion problem, no absorbent degradation problem, lower desorption energy[5,6], and the ability to capture all three major acid gases(SO2, NOX, CO2), is becoming a hot research 7]. Liu Fang[9] researched the process of CO2 desorption from ammonium bicarbonate, Zeng Qing[10] studied the characteristics of CO2 desorption from Carbonated ammonia solution, which showed that desorption rate was influenced by temperature, CO2 loading. This paper studied the influence of HCO3- (put NaHCO3 into solution as a additives) on CO2 absorption and desorption from ammonia solution which keep the concentration of NH4+ the same and change the solution of HCO3- concentraon

Theory
The Experiment System
CO2 Desorption Characteristics in Ammonium Bicarbonate Solution
Findings
Sodium Bicarbonate of CO2 Absorption Effect
Conclusion
Full Text
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