公开(公告)号：US20250019333A1

公开(公告)日：2025-01-16

申请号：US18714615

申请日：2022-12-02

Applicant: BASF SE

Inventor： Nicolas DUYCKAERTS ,  Rupert WAGNER ,  Martin KAMASZ ,  Andreas KELLER ,  Christian WALSDORFF

IPC: C07C45/38 ,  B01D3/14 ,  B01J23/50

Abstract: In a process for preparing isoprenal and/or prenal by bringing a gaseous reactant stream comprising isoprenol into contact with a silver-containing heterogeneous catalyst in the presence of molecular oxygen to obtain an isoprenal and/or prenal-containing product stream, a weight ratio of formaldehyde to isoprenol of less than 0.04 is maintained in the reactant stream. The process maintains high conversion and selectivity over time and avoids catalyst clogging and pressure drop.

公开(公告)号：US20240158325A1

公开(公告)日：2024-05-16

申请号：US18281451

申请日：2022-03-11

Applicant: BASF SE

Inventor： Andreas KELLER ,  Hans HASSE ,  Rupert WAGNER ,  Bernhard BRUNNER ,  Matthias SCHULT ,  Stephan MAURER ,  Heiko HALLMANN ,  Maximilian DYGA

IPC: C07C29/80 ,  B01D3/14

CPC classification number: C07C29/80 ,  B01D3/143

Abstract: A process for recovering isoprenol essentially free of formaldehyde from a stream of crude isoprenol containing isoprenol, water and formaldehyde, the process comprising subjecting the stream of crude isoprenol or an isoprenol containing fraction thereof to distillation in a low-boiler separation tower operated at a pressure of 2.5 bara or higher to obtain a distillate stream containing aqueous formaldehyde and a bottoms stream containing isoprenol. The process of the invention allows for obtaining isoprenol essentially free of formaldehyde. Further provided is a plant for recovering isoprenol essentially free of formaldehyde from a stream of crude isoprenol containing isoprenol, water and formaldehyde, the plant comprising a first low-boiler separation tower, a second low-boiler separation tower, and a finishing tower.