The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 2021
Filed:
Dec. 11, 2017
Basf SE, Ludwigshafen am Rhein, DE;
BASF SE, Ludwigshafen am Rhein, DE;
Abstract
Process for isolating pure 2-ethylhexyl acrylate or pure 2-propylheptyl acrylate from the corresponding crude alkyl acrylate by distillation, wherein the process is carried out in a dividing wall column () which has separation-active internals and vaporizer () and in which a dividing wall () is arranged in the longitudinal direction of the column to form an upper joint column region (), a lower joint column region (), an inflow section () having a side feed point () and an offtake section () having a side offtake point (), the column has a number of theoretical plates in the range from 10 to 60, where the number of theoretical plates of the dividing wall column () relates to the sum of the theoretical plates in the joint upper column region (), the joint lower column region () and the inflow section (), the side feed point () for the corresponding crude alkyl acrylate is arranged at a theoretical plate in the region commencing at least two theoretical plates above the bottommost theoretical plate and ending at least two theoretical plates below the uppermost theoretical plate, the side offtake point () for the pure 2-ethylhexyl acrylate or pure 2-propylheptyl acrylate is arranged at a theoretical plate in the region commencing at least two theoretical plates above the bottommost theoretical plate and ending at least two theoretical plates below the uppermost theoretical plate and the dividing wall () is arranged in the column in the region commencing at least one theoretical plate above the bottommost theoretical plate and ending at least one theoretical plate below the uppermost theoretical plate, where the ratio of amount of liquid at the upper end of the dividing wall () going to the enrichment section () and the stripping section () of the column is set in the range from 1:0.2 to 1:5.