Study of Reactive Precipitation in Vortex Impinging Streams Reactor

Abstract

The vortex impinging streams technology (VIS) has good micromixing in the precipitation processes. The experiments were loaded with two reactants, BaCl2and Na2SO4, using ethylene diamine tetraacetic acid (EDTA) as complexing agent, to prepare BaSO4 in the vortex impinging streams reactor at Re=2500, comparing with those in the stirred tank reactor (STR). The products were characterized by XRD, TEM, BET and FTIR. The results indicate barium sulfate superfine particles are crystallized in the orthorhombic structure with lattice parameters a=7.156 Å, b=8.881 Å, and c=5.454 Å. The size of the ellipsoidal particles from VIS is about 386 nm, with narrower distribution and finer dispersity than that from STR. The specific surface area of the particles from VIS is 29.25 m2/g, comparing to 11.95 m2/g from STR. The infrared spectra decades the surface of the prepared BaSO4absorbs the functional group of EDTA.