TAILIEUCHUNG - Crystallization in couette taylor crystallizer: Effect of taylor vortices flow on the nucleation and reconstruction of L-glutamic acid in cooling crystallization
The advantage of Taylor 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. | Journal of Science and Technology 54 (5) (2016) 625-631 DOI: CRYSTALLIZATION IN COUETTE-TAYLOR CRYSTALLIZER: EFFECT OF TAYLOR VORTICES FLOW ON THE NUCLEATION AND RECONSTRUCTION OF L-GLUTAMIC ACID IN COOLING CRYSTALLIZATION Khuu Chau Quang1, Dang Truong Giang1, Nguyen Dinh Tuyet1, Le Thi Hong Nhan2, Phan Thanh Thao1, Trinh Thi Thanh Huyen1, *, Nguyen Anh Tuan1, * 1 2 Institute of Chemical Technology (VAST), 1 Mac Dinh Chi Street, District 1, HCMC HoChiMinh City University of Technology, 268 Ly Thuong Kiet Street, District 10, HCMC * Email: thanhhuyenkhtn@, nhtnat@ Received: 26 November 2015; Accepted for publication: 26 January 2016 ABSTRACT The effect of Taylor vortices flow of Couette-Taylor (CT) crystallizer on the nucleation and reconstruction of L-glutamic acid was firstly investigated in cooling crystallization. Generally, L-glutamic acid has two kinds of polymorphic crystal including metastable α-form and stable βform, where the α-form is initially crystallized and then slowly transformed into the β-form, which is called the phase transformation. The present study explored that there was a significant difference between CT and the conventional ST crystallizer 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 times as using the Taylor vortices flow. The advantage of Taylor 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. Keywords: crystallization, nucleation, crystal growth, Couette-Taylor crystallizer, Taylor vortices flow. 1. INTRODUCTION Crystallization is significant separation, purification and
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