Recovery of acetate by anion exchange with consecutive CO2-expanded methanol desorption: A model-based approach

被引：7

作者：

Cabrera-Rodriguez, Carlos I. ^{[1
]}

Cartin-Caballero, Carlos M. ^{[1
,2
]}

Platarou, Evgenia ^{[1
]}

de Weerd, Florence A. ^{[1
]}

van der Wielen, Luuk A. M. ^{[1
,3
]}

Straathof, Adrie J. J. ^{[1
]}

机构：

[1] Delft Univ Technol, Dept Biotechnol, Van der Maasweg 9, NL-2629 HZ Delft, Netherlands

[2] Univ Nacl Costa Rica, Escuela Quim, Heredia, Costa Rica

[3] Univ Limerick, Bernal Inst, Limerick, Ireland

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2018年 / 203卷

关键词：

Acetate; Anion exchange; Desorption; CO2-expanded methanol; Ion exchange modeling; ION-EXCHANGE; CARBOXYLIC-ACIDS; ORGANIC-ACIDS; ACETIC-ACID; ADSORPTION; EQUILIBRIUM; ADSORPTION/DESORPTION; RESINS; PK(A); WATER;

D O I：

10.1016/j.seppur.2018.03.068

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Production of bio-based acetate is commonly hindered by the high costs of the downstream processing. In this paper, a model is developed to describe a new method that recovers acetate salts using anion exchange resins, and subsequently desorbs and upgrades them using CO2-expanded alcohol. The model consists of equilibrium parameters for both the adsorption and desorption step. The calculated parameters are: for the adsorption K-Cl-(Ac-) = 0.125, K-Cl-(HCO3-) = 0.206 and K-OV,K-HAC = 0.674mol/kg(resin)/mol/kg(solution), and for the desorption pK(MeCO3-)(Ac-) = 3.71. The maximum experimental concentration of acetic acid obtained in CO2-expanded methanol is 0.427 mol/kg (20 g/L-MeOH) at an operating pressure of 31 bar. The model represents the expected trends for all species, and can be used to design a multicolumn system for the recovery and upgrading of carboxylates.

引用

页码：56 / 65

页数：10

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