Absorption-mineralization performance of CO2 by mixed alcohol amine solution coupled with purified dusts from calcium carbide furnace
- Low-carbon Chemistry and Chemical Engineering Vol. 48, Issue 5, Pages: 125-134(2023)
- 作者机构：
1.西安交通大学 能源与动力工程学院， 陕西 西安 710049
- 作者简介：
- 基金信息：
DOI：10.12434/j.issn.2097-2547.20230196
CLC：
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FENG Jingwu, WANG Yibin, MA Jiahui, et al. Absorption-mineralization performance of CO2 by mixed alcohol amine solution coupled with purified dusts from calcium carbide furnace. [J]. Low-carbon Chemistry and Chemical Engineering 48(5):125-134(2023)
FENG Jingwu, WANG Yibin, MA Jiahui, et al. Absorption-mineralization performance of CO2 by mixed alcohol amine solution coupled with purified dusts from calcium carbide furnace. [J]. Low-carbon Chemistry and Chemical Engineering 48(5):125-134(2023) DOI： 10.12434/j.issn.2097-2547.20230196.
摘要
针对醇胺吸收法中富CO,2,吸收液的解吸封存问题，详细探究了乙醇胺（MEA）与N,N-二甲基乙醇胺（DMEA）混合溶液耦合电石炉净化灰吸收-矿化CO,2,的潜力，并同等添加比例（,n,(CO,2,):,n,(Ca) = 1.0:1.0）下CaO、Ca（OH）,2,的CO,2,矿化性能进行了对比。实验结果表明，配比为1.5 mol/L MEA + 1.5 mol/L DMEA的混合醇胺溶液的CO,2,吸收负荷和解吸率最大，分别为1.807 mol/L和82.78%；经过4次吸收-解吸循环后其CO,2,吸收性能有所下降，但4次循环后CO,2,吸收负荷仍有0.950 mol/L，利用电石炉净化灰可有效解吸封存MEA/DMEA混合醇胺溶液吸收的CO,2,。电石炉净化灰的解吸性能接近CaO但优于Ca（OH）,2,，所得矿化产物包括文石、球霰石和方解石型碳酸钙。这主要由于活性含钙物质可以向富CO,2,溶液中释放Ca,2+,和OH,-,，继而同溶液中CO,,https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=49103359&type=,https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=49103372&type=,2.28600001,3.72533321,和HCO,,https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=49103362&type=,https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=49103360&type=,1.10066664,3.72533321,反应生成CaCO,3,沉淀，并中和质子化胺MEAH,+,/DMEAH,+,，同时实现CO,2,矿化和混合醇胺溶液的再生。
Abstract
To address the problem of desorption and sequestration of CO,2,-rich absorption solution in the alcoholamine absorption method, the potential of absorption-mineralization of CO,2, from mixed solution of ethanolamine (MEA) and N,N-dimethylethanolamine (DMEA) which coupled with purified dusts from calcium carbide furnace was investigated in detail. And the CO,2, mineralization performance of this purified dust was compared with that of CaO and Ca(OH),2, at an equal adding proportion (,n,(CO,2,):,n,(Ca) = 1.0:1.0). The experimental results show that the CO,2, absorption loads and desorption rate are the largest with the 1.5 mol/L MEA + 1.5 mol/L DMEA mixed solution, which are respectively 1.807 mol/L and 82.78%. The CO,2, absorption performance decreases after four absorption-desorption cycles, but still has the CO,2, absorption loads of 0.950 mol/L. The CO,2, absorbed by MEA/DMEA mixed solution can be effectively desorbed and stored by purified dusts from calcium carbide furnace. The desorption performance of purified dusts from calcium carbide furnace for CO,2, rich solution is similar to that of CaO but better than that of Ca(OH),2,. The mineralization products consist three types of calcium carbonate which are aragonite, sphalerite and calcite. This is mainly due to the fact that the active calcium-containing components can release Ca,2+, and OH,-, into the CO,2, rich solution, and then they react with CO,,https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=49103364&type=,https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=49103380&type=,2.37066650,3.55599999, and HCO,,https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=49103398&type=,https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=49103385&type=,1.10066664,3.55599999, in the solution to form CaCO,3, neutralize the protonated amine MEAH,+,/DMEAH,+,. Finally, CO,2, mineralization and alcoholamine solution regeneration are achieved simultaneously.
关键词
CO2吸收混合醇胺解吸碱性固废矿化
Keywords
CO2 absorptionmixed alcohol aminedesorptionalkaline solid wastemineralization
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