CAJ | 학술논문

提出一种溶剂萃取与 Ca2+碳酸化的耦合反应过程,以三丁胺为萃取剂将 HCl 从水相萃取到有机相,在固定CO2 的同时实现 CaCl2 的碳酸化,副产碳酸钙与氯化铵.实验结果显示,超过 98%的 Ca2+在 1400s 内沉淀为碳酸钙,反应后有机相迅速与水相实现分层,并通过与氨水反应再生,三丁胺回收率约为 98%.采用粒径分布与显微镜观察证明了 Ca2+沉淀过程发生在油包水结构中.以 15%浓度的 CO2 作为碳源,反应时间为 2700 s 时,Ca2+沉淀率达到 98.31%,显示该工艺将高成本的 CO2 捕集过程和封存过程集成,可处理低浓度烟气中的 CO2.过程无须CO2 捕集费用以及热量输入,同时副产碳酸钙和氯化铵产品,有望缓解常规 CO2 捕集封存技术高成本的难题.
제출일충용제췌취여 Ca2+탄산화적우합반응과정,이삼정알위췌취제장 HCl 종수상췌취도유궤상,재고정CO2 적동시실현 CaCl2 적탄산화,부산탄산개여록화안.실험결과현시,초과 98%적 Ca2+재 1400s 내침정위탄산개,반응후유궤상신속여수상실현분층,병통과여안수반응재생,삼정알회수솔약위 98%.채용립경분포여현미경관찰증명료 Ca2+침정과정발생재유포수결구중.이 15%농도적 CO2 작위탄원,반응시간위 2700 s 시,Ca2+침정솔체도 98.31%,현시해공예장고성본적 CO2 포집과정화봉존과정집성,가처리저농도연기중적 CO2.과정무수CO2 포집비용이급열량수입,동시부산탄산개화록화안산품,유망완해상규 CO2 포집봉존기술고성본적난제.
An intensified process by coupling the carbonation reaction and solvent extraction was proposed for CO2 mineralization in CaCl2-rich solution to capture CO2 and generate CaCO3 and NH4Cl. Tributylamine was used as the extractant to remove HCl from aqueous phase and precipitate CaCO3. Experiments showed that the precipitation ratio of Ca2+ reached ca. 98% at 1400 s. The organic phase could be spontaneously separated from the aqueous phase immediately after extraction, and recycled by reacting with NH3·H2O with a tributylamine regeneration ratio of ca. 98%. In addition, the experiment using low CO2 concentration (i.e., 15% CO2 in N2) could also reach a high level of 98.31% at a reaction time of 2700 s, which exhibited the potential to integrate CO2 capture and CO2 storage in a one-step process. The particle size distribution of calcite and the observation of water-in-oil structures indicated that the formation of calcite was occurred in the water-in-oil structures. This process, with simple apparatus, no heat input, unrequired CO2 capture cost and production of valuable CaCO3 and NH4Cl, greatly reduced the costs of CO2 sequestration, and might be an alternative method to solve the primaryproblem of the conventional high-cost CCS technology.