Abstract
Abstract 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 C l - Ac - = 0.125 , K C l - HC O 3 - = 0.206 and K OV , HAc = 0.674 mol / kg resin mol / kg solution , and for the desorption p K MeCO 3 - Ac - = 3.71 . The maximum experimental concentration of acetic acid obtained in CO2-expanded methanol is 0.427 mol/kg (20 g/LMeOH) 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.
Highlights
Bio-based production of carboxylic acids via fermentation is a route to a wide variety of chemicals [1]
The model consists of equilibrium parameters for both the adsorption and desorption step
The resin shows a lower capacity for acetic acid than for acetate
Summary
Bio-based production of carboxylic acids via fermentation is a route to a wide variety of chemicals [1]. Commercial production of carboxylic acids by fermentation is only possible if the recovery from the aqueous solution is efficient. Traditional recovery of carboxylic acids from these carboxylate salts involves high energy consumption and waste co-production. One method to capture carboxylates from a dilute solution is to use strong anion exchange resins. To avoid the use of strong mineral acids during desorption, a novel process for the recovery of carboxylic acid using the strong anion exchange resins and desorption with CO2-expanded alcohols was developed [3]. The resin is regenerated to the bicarbonate form and the carboxylic acid dissolves in the CO2-expanded alcohol solution for further processing (e.g. ester formation)
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