Influence of mixing and solid concentration on sodium bicarbonate secondary nucleation rate in stirred tank

Abstract

This work aims to investigate the influence of the solid concentration in suspension on the contact secondary nucleation rate of sodium bicarbonate crystallization in a stirred tank crystallizer and to show the necessity of a local description of the mixing for a nucleation rate influence study. Experiments and computational fluid dynamics (CFD) simulations are realized. Crystallization kinetic parameters are extracted from experimental data using a mass distribution fitting approach. CFD and the experimental results allow identifying that a mixing property correlated with the measurements of the secondary nucleation rate in the stirred tank crystallizer appears to be the turbulent dissipation rate on the edge of the impeller. Its influence and the influence of the solid concentration in the suspension on the secondary nucleation rate are estimated by the evaluation of their exponents in a kinetic law. The obtained exponent values are then discussed qualitatively.

Optimization of Sodium Bicarbonate Production from Ammonium Hydroxide Using a Froth Flotation Column

“…4). The results of this study resemble the results described in [10,20,21], where the sodium bicarbonate particles are spherical (though not necessarily geometrically round), the structure is hollow, and the outer shell resembles a rod-shaped crystallite. In Fig.…”

“…Based on the EDS results, sodium bicarbonate turned into a solid crystal with small impurities of NaCl crystals, while the NH 4 Cl solution and unreacted NH 4 OH solution were separated during filtration as shown in Eq. 5 10, 21. The NH 4 OH impurities in sodium bicarbonate will be evaporated during the drying process of sodium bicarbonate at a temperature 50 °C with the following reaction: …”

Utilization of CO2 in Flue Gas for Sodium Bicarbonate Production in a Bubble Column

“…They used pure or high CO 2 gas mole fraction (>50 %) in an industrial bubble column. The first researchers group used an industrial bubble column called (BIR) column (2.5 m diameter and 20 m height) with a circulation loops in the lower part of the column that providing a perfect mixing, the group is named as SOLVAY mixed flow group [9][10][11][12][13][14]. The second group used a plug flow industrial bubble column (1.2 m diameter and 22 m height) that located in Shiraz Petrochemical Complex in Iran and the group is named as SHIRAZ plug flow group [5,[15][16][17][18].…”