Physicochemical comparison of precipitated calcium carbonate for different configurations of a biogas upgrading unit
Physicochemical comparison of precipitated calcium carbonate for different configurations of a biogas upgrading unit
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DOI：
10.1002/jctb.6013
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发表时间：
2019-03
影响因子：
3.4
通讯作者：
F. Baena-Moreno;C. Price;E. le Saché;L. Pastor-Pérez;D. Sebastia‐Saez;T. Reina
中科院分区：
文献类型：
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作者：
F. Baena-Moreno;C. Price;E. le Saché;L. Pastor-Pérez;D. Sebastia‐Saez;T. Reina
本文介绍了从回收废碳酸钠（Na2CO3）溶液的两种替代工艺中获得的固体产物的物理化学比较，所述废碳酸钠（Na2CO3）溶液是在沼气提质单元中吸收CO2后产生的。化学再生过程提供了一个有吸引力的替代能源要求的标准物理方法。在第一种方法中，氢氧化钠（NaOH）作为来自Na2CO3与氢氧化钙（Ca（OH）2）的化学反应的沉淀物再生。第二种方法显示了从氯化钙（CaCl2）作为沉淀剂获得有价值的氯化钠（NaCl）和碳酸钙（CaCO3）富集盐水的途径。在这两种工艺中，重结晶碳酸钙（PCC）作为最有价值的副产品获得，但由于来源不同，其性质也不同。结果这项工作的目的是对获得的PCC的两种变化进行物理化学分析，并检查这些固体样品之间的差异，以确定哪种方法在最终产品中产生更理想的特征。采用FTIR、拉曼、XRD和SEM等方法对样品进行了表征。结果反映两种PCC都具有方解石晶体结构或形态，因为两种PCC产物都源自CaCl 2，其更类似于商业碳酸钙方解石。结论这些结果证实，可以从具有几个工业应用的沼气提质单元中获得有价值的纯CaCO3副产物。
BACKGROUND This paper presents a physicochemical comparison of the solid products obtained from two alternative processes that recycle waste sodium carbonate (Na2CO3) solution, which is produced following the absorption of CO2 in a biogas‐upgrading unit. Chemical regeneration processes offer an attractive alternative to the energetically demanding standard physical methods. In the first process, sodium hydroxide (NaOH) is regenerated as a precipitate from the chemical reaction of Na2CO3 with calcium hydroxide (Ca(OH)2). The second process shows a path to obtain a valuable sodium chloride (NaCl) and Calcium carbonate (CaCO3) rich brine from calcium chloride (CaCl2) acting as a precipitant agent. In both processes, Precipitated Calcium Carbonate (PCC) is obtained as the most valuable by‐product, but with varying properties due to the different origin. RESULTS The purpose of this work is to analyse physicochemically both variations of PCCs obtained and examining the differences between these solid samples in order to determine which method produces more desirable characteristics in the final product. To this end, FTIR, Raman, XRD and SEM were employed as characterization methods. The results reflect that both PCCs have a calcite crystal structure, or morph, being as both PCC products originate from CaCl2 that is more similar to commercial calcium carbonate calcite. CONCLUSION These results confirmed that a pure CaCO3 valuable by‐product can be obtained from a biogas upgrading unit with several industrial applications.