tailieunhanh - Development of couette taylor crystallizer in cooling crystallization: Promotion of size distribution of L-lysine

The Couette-Taylor (CT) crystallizer was developed to promote the size distribution of LLysine crystal product in cooling crystallization. When using the CT crystallizer, the size distribution of crystal product was much narrower than that of the conventional Stirred tank (ST) crystallizer. Here, the coefficient size distribution (n) in CT crystallizer was quite large as , while it was only in ST crystallizer at the same 360 rpm of agitation or rotation speed | Journal of Science and Technology 54 (5) (2016) 643-649 DOI: DEVELOPMENT OF COUETTE-TAYLOR CRYSTALLIZER IN COOLING CRYSTALLIZATION: PROMOTION OF SIZE DISTRIBUTION OF L-LYSINE Dang Truong Giang, Khuu Chau Quang, Phan Thanh Thao, Trinh Thi Thanh Huyen*, Nguyen Anh Tuan* Institute of Chemical Technology, VAST, 1 Mac Dinh Chi, District 1, HCMC * Email: thanhhuyenkhtn@, nhtnat@ Received: 23 December 2015; Accepted for publication: 11 April 2016 ABSTRACT The Couette-Taylor (CT) crystallizer was developed to promote the size distribution of LLysine crystal product in cooling crystallization. When using the CT crystallizer, the size distribution of crystal product was much narrower than that of the conventional Stirred tank (ST) crystallizer. Here, the coefficient size distribution (n) in CT crystallizer was quite large as , while it was only in ST crystallizer at the same 360 rpm of agitation or rotation speed. This result indicated that the CT crystallizer was much more effective than the ST crystallizer in terms of the size distribution of L-lysine crystal products in cooling crystallization. The advantage of CT crystallizer over the ST crystallizer was explained in terms of the high energy dissipation of Taylor vortices flow, where it was times higher than that of random fluid motion in conventional ST crystallizer. As such, the supersaturation profile in the CT crystallizer was much more homogeneous than that in the ST crystallizer, which resulted in promotion of size distribution L-lysine crystal product. Keywords: crystallization, nucleation, crystal growth, agglomeration/Breakage, Couette-Taylor crystallizer. 1. INTRODUCTION Crystallization is a very important separation, purification and particle synthesis process, which is certainly required in numerous industries such as foods, pharmaceuticals, chemicals and agriculture in order to obtain the high quality of crystal products including purity, size .