A Green and Economical Method for Preparing Potassium Glutamate through Electrodialysis Metathesis

Abstract

Potassium glutamate has a very high value due to its excellent medical effects. An electrodialysis metathesis (EDM) method was developed to prepare high-value potassium glutamate from low-cost sodium glutamate. The effects of initial sodium glutamine and potassium sulfate concentrations and operating voltage on the performance of EDM were studied. The results show that the higher initial sodium glutamate concentration can increase the production capacity, but the energy consumption becomes higher, and the current efficiency reduces. The higher the initial potassium sulfate concentration, the better the performance of EDM. When the operating voltage is 15 V, the lowest energy consumption is 2.59 kWh·kg–1 C5H8KNO4. Under the best experimental conditions, the purity of potassium glutamate can reach 98.92%. The calculated cost for the process of preparing potassium glutamate by EDM is $0.394 kg–1 C5H8KNO4. Compared with the traditional preparation of potassium glutamate, EDM has obvious advantages in process flow, raw material use, product generation, and processing. Therefore, the preparation of potassium glutamate by EDM is a green and economical method.

Process for Producing Lithium Iodide Cleanly through Electrodialysis Metathesis

“…Indeed, the operating voltage plays a pivotal role in the electrodialysis metathesis process, as it directly impacts energy consumption and current efficiency within the membrane stack. , Consequently, choosing an appropriate operating voltage is of utmost significance to optimize the performance of electrodialysis metathesis. In this experiment, where the initial KI concentration was set at 0.2 mol/L and the initial Li 2 SO 4 concentration was set at 0.1 mol/L, the investigation was specifically focused on understanding the influence of the operating voltage on the preparation process.…”

“…Energy consumption (kWh/kg·LiI) was calculated according to eq : E = ∫ 0 t U I normald t C t V t M where C t is the molar concentration of LiI in product chamber 1 at time t , mol/L; V t is the volume of product chamber 1 at time t , L; M is the molar mass of LiI, g/mol; U and I are the membrane stack voltage and current, V and A , respectively.…”

“…The current efficiency was calculated according to eq : η = z F C t V t − C 0 V 0 N ∫ 0 t I normald t where z is the ionic valence state, z = 1; F is the Faraday constant, F = 96,500 C/mol; C t and C 0 are the molar concentration of LiI in the product chamber 1 at the time t and the molar concentration of LiI in the product chamber 1 at the initial time, mol/L; V t and V 0 are the volume of the product chamber 1 at the time t and the volume of the product chamber 1 at the initial time, L; N is the number of repetition units, N = 1; I is the current, A.…”

Optimizing Operational Parameters for Lithium Hydroxide Production via Bipolar Membrane Electrodialysis

“…The ion exchange membrane is a type of membrane-like ion exchange resin [12,13], which can be categorized into a cation exchange membrane, anion exchange membrane, and special ion exchange membrane. Its main characteristic is the selective permeation of specific ions, and the underlying principle can be explained by theories such as Donnan equilibrium [14][15][16][17].…”