	US 11,926,588 B2
	Method for purifying (meth)acrylic esters using a divided wall column
Serge Tretjak, Saint Avold (FR); Yves Cabon, Saint Avold (FR); Andre Levray, Saint Avold (FR); Camille Hilpert, Saint Avold (FR); and Anne Moreliere, Saint Avold (FR)
Assigned to Arkema France, Colombes (FR)
Appl. No. 17/424,204
Filed by Arkema France, Colombes (FR)
PCT Filed Jan. 21, 2020, PCT No. PCT/FR2020/050075 § 371(c)(1), (2) Date Jul. 20, 2021, PCT Pub. No. WO2020/152415, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 19.00541 (FR), filed on Jan. 22, 2019.
Prior Publication US 2022/0106251 A1, Apr. 7, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 67/08 (2006.01); C07C 67/54 (2006.01)

CPC C07C 67/08 (2013.01) [C07C 67/54 (2013.01)]

13 Claims

1. A process for recovering a purified C₄-C₁₂(meth)acrylic ester, starting from a crude reaction mixture including Michael adducts obtained by direct esterification of the (meth)acrylic acid with the corresponding C₄-C₁₂alcohol wherein said process comprises the step of:

using a purification system comprising a dividing wall column equipped with a separating wall which is not joined to the upper dome of the column in the top part and is joined to the bottom of the column in the bottom part, and associated at the top with a single condenser and at the bottom with two boilers, said dividing wall column comprising a common rectification section above the wall, a prefractionation section comprising a feed of the crude reaction mixture of the column, and a withdrawal section separated from the prefractionation section by the wall and comprising the withdrawal of the purified ester; wherein said dividing wall column further comprises an outlet at the upper dome of the column, two outlets at the bottom part of the column and one outlet at the withdrawal section.