Roncal Tomás, Aguirre Ainhoa, Belaustegui Yolanda, Andrés Elisabet
TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Tecnológico de San Sebastián Mikeletegi Pasealekua 2 20009 Donostia-San Sebastián Spain
Parque Tecnológico de Álava Leonardo da Vinci 11 01510 Miñano Spain.
RSC Adv. 2025 Jan 3;15(1):477-488. doi: 10.1039/d4ra08341e. eCollection 2025 Jan 2.
A downstream process for the recovery and purification of acetic acid (AA) from an extremely diluted solution (100 mg L) also containing a mixture of contaminating inorganic salts in the form of bicarbonates, phosphates, sulfates and chlorides (DPM medium) has been developed, showing its technical feasibility. The process involves two successive steps based on the use of a mixed bed ion exchange (IEX) resin. The first step, a demineralization treatment to remove the inorganic anions that could potentially interfere with the recovery and purification of AA, involves a combined treatment of calcium precipitation, acidification with the Amberlite IR-120 resin and treatment with the Amberlite MB20 mixed bed resin. This treatment allows the total removal of phosphate and sulfate (and likely bicarbonate) and 90% removal of chloride, while still retaining 91% of AA in solution. In the second step the demineralized medium is treated again with the Amberlite MB20 mixed bed resin in batch to completely remove AA and chloride remaining in solution and, finally, the anion-loaded resin is step-eluted with a low volume of diluted HSO to selectively elute AA, obtaining a purified (68.5-82.2% recovery yield and 96.9-99.2% purity) and concentrated (>1500 mg L) solution of the acid.
已开发出一种从极稀溶液（100 mg/L）中回收和纯化乙酸（AA）的下游工艺，该溶液还含有以碳酸氢盐、磷酸盐、硫酸盐和氯化物形式存在的混合污染无机盐（DPM培养基），证明了其技术可行性。该工艺基于使用混合床离子交换（IEX）树脂，包括两个连续步骤。第一步是脱盐处理，以去除可能干扰AA回收和纯化的无机阴离子，包括钙沉淀、用Amberlite IR-120树脂酸化以及用Amberlite MB20混合床树脂处理的联合处理。这种处理可完全去除磷酸盐和硫酸盐（可能还有碳酸氢盐），并去除90%的氯化物，同时仍使91%的AA保留在溶液中。第二步，将脱盐后的介质再次用Amberlite MB20混合床树脂进行分批处理，以完全去除溶液中残留的AA和氯化物，最后，用少量稀释的HSO对负载阴离子的树脂进行分步洗脱，以选择性地洗脱AA，得到纯化的（回收率为68.5 - 82.2%，纯度为96.9 - 99.2%）且浓缩的（>1500 mg/L）酸溶液。
