US 10,981,844 B2
Semi-continuous crystallization method and apparatus
Mathias Pfeil, Winterthur (CH); and Manfred Stepanski, Buchs (CH)
Assigned to Sulzer Management AG, Winterthur (CH)
Appl. No. 15/736,070
Filed by Sulzer Chemtech AG, Winterthur (CH)
PCT Filed Jun. 16, 2016, PCT No. PCT/EP2016/063889
§ 371(c)(1), (2) Date Dec. 13, 2017,
PCT Pub. No. WO2016/207056, PCT Pub. Date Dec. 29, 2016.
Claims priority of application No. 15173637 (EP), filed on Jun. 24, 2015.
Prior Publication US 2018/0179121 A1, Jun. 28, 2018
Int. Cl. C07B 63/00 (2006.01); B01D 9/00 (2006.01); C07C 7/14 (2006.01); C07C 51/43 (2006.01)
CPC C07B 63/00 (2013.01) [B01D 9/004 (2013.01); B01D 9/0013 (2013.01); C07C 7/14 (2013.01); C07C 51/43 (2013.01); B01D 2009/0086 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A plant for the separation and purification of a substance in a concentration of less than 50% by weight, the plant comprising:
(a) a source of the liquid feed mixture comprising the substance to be separated and purified in a concentration of less than 50% by weight,
(b) a static crystallization apparatus,
wherein the static crystallization apparatus comprises:
(c) a vessel,
(d) a substantially vertically-disposed cooled surface,
(e) optionally a crystal-retention system for retaining crystals within the vessel,
(f) a liquid inlet distribution system embodied so as to distribute a liquid substantially homogeneously over a horizontal cross-section of the vessel and
(g) a liquid outlet collection system embodied so as to collect liquid homogeneously along an edge between a substantially vertical wall and a bottom of the vessel,
wherein the static crystallization apparatus additionally comprises a circulation loop connected directly between the liquid outlet collection system and the liquid inlet distribution system, wherein the circulation loop is embodied to provide at least a partial recirculation directly between the liquid outlet collection system and the liquid inlet distribution system.