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The effect of Taylor vortices flow of Couette-Taylo r (CT) crystallizer on the nucleation and reconstruction of L-glutamic acid was firstly inves tigated in cooling crystallization. Generally, L-glutamic acid has two kinds of polymorphic crysta l including metastable α-form and stable βform, where the α-form is initially crystallized and then slowly tra nsformed into the β-form, which is called the phase transformation. The prese nt tudy explored that there was a significant difference between CT and the conventional ST cryst allizer as regards the nucleation and reconstruction of L-glutamic acid. Here, the phase transformation determined by the nucleation and reconstruction was 40 h in ST crystallizer, yet it was only 20 h as using the CT crystallizer, implying that the nucleation and reconstruction of L-glutamic acid was facilitated 2.0 times as using the Taylor vortices flow. The advantage of Ta ylor vortices flow in CT crystallizer over the random fluid motion in ST crystallizer with regards the nucleation and reconstruction was explained in term of the high energy dissipation of Taylor vortices flow.

vietnam journal of science and technology/science and technology

Crystallization in Couette-Taylor Crystallizer: Effect of Taylor Vortices Flow on the Nucleation and Reconstruction of L-Glutamic Acid in Cooling Crystallization