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Supercritical CO2 assisted strategy for acetic acid elimination from industrial cellulose acetate–water mixtures
Chemical Engineering Research and Design ( IF 3.9 ) Pub Date : 2021-06-15 , DOI: 10.1016/j.cherd.2021.06.007
Lucia Baldino , Ernesto Reverchon

A critical analysis of the major steps involved in the cellulose acetate industrial process is performed, with the aim of proposing possible improvements using supercritical CO2 based sub-processes. Once highlighted the main weakness of the traditional process, related to the (i) fine modulation of the acetylation reaction to obtain 2.5 acetate, (ii) acetic acid removal from the acetic dope, and (iii) treatment of the diluted acetic acid–water solution, the most attractive alternative resulted the adoption of a supercritical antisolvent extraction (SAE) performed on the acetic dope. Operating in this way, the problems related to the use of large quantities of water to remove acetic acid from the acetic dope are resolved, since it will be directly extracted by supercritical CO2. Micro- and nanoparticles, or filaments, of cellulose acetate can be produced. Finally, an acetic acid residue of 23 ppm, in the supercritical CO2 treated cellulose acetate, confirmed the success of this alternative process configuration.



中文翻译:

从工业醋酸纤维素-水混合物中去除醋酸的超临界 CO 2辅助策略

对醋酸纤维素工业过程中涉及的主要步骤进行了关键分析,目的是提出使用基于超临界 CO 2的子过程的可能改进。曾经强调了传统工艺的主要弱点,涉及(i)乙酰化反应的精细调节以获得 2.5 乙酸酯,(ii)从乙酸原液中去除乙酸,以及(iii)稀释乙酸-水的处理在解决方案中,最有吸引力的替代方案是采用对乙酸原液进行的超临界反溶剂萃取 (SAE)。以这种方式操作,解决了与使用大量水从醋酸涂料中去除醋酸有关的问题,因为它将被超临界 CO 2直接提取. 可以生产醋酸纤维素的微米和纳米颗粒或细丝。最后,在超临界 CO 2处理的醋酸纤维素中的 23 ppm 醋酸残留证实了这种替代工艺配置的成功。

更新日期:2021-06-19
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