公开(公告)号：US20190031581A1

公开(公告)日：2019-01-31

申请号：US16072695

申请日：2017-02-02

Applicant: BASF SE

Inventor： Norbert ASPRION

IPC: C07C7/08 ,  C07C7/00 ,  B01D3/40 ,  B01D3/14 ,  B01D3/00

Abstract: A method for separating a mixture of materials A and B by extractive distillation, using an extraction medium having a higher affinity to B than to A, wherein a feed stream comprising A and B is conducted towards the extraction medium in a column, wherein an overhead fraction comprising A and also a liquid fraction comprising B and extraction medium are obtained, the liquid fraction is collected on a collecting tray and heated and partially evaporated in a first indirect heat exchanger, the resultant vapor is released into the column and a non-evaporated proportion of the liquid fraction is collected as sump fraction in the sump of the column, the sump fraction is successively heated in a second indirect heat exchanger and a third indirect heat exchanger and in part evaporated, wherein the resultant vapor is at least in part released into the column, the sump fraction is separated in a stripper into a fraction comprising B and an extraction medium fraction, the extraction medium fraction is used as heating medium for the second heat exchanger, wherein a partially cooled extraction medium fraction is obtained, and an external heating medium is used for the third heat exchanger, and the partially cooled extraction medium fraction is used as heating medium for the first heat exchanger.

公开(公告)号：US20150329477A1

公开(公告)日：2015-11-19

申请号：US14653094

申请日：2013-12-18

Applicant: BASF SE

Inventor： Ortmund LANG ,  Norbert ASPRION ,  Axel BINDER ,  Bernd METZEN ,  Christof Wilhelm WIGBERS ,  Petr KUBANEK ,  Thomas STEINHILBER

IPC: C07C231/24 ,  B01D3/42 ,  B01D3/06

CPC classification number: C07C231/24 ,  B01D3/06 ,  B01D3/42 ,  C07C231/02 ,  C07C233/05

Abstract: What is proposed is a continuous process for discharging a solid, salt-containing phase comprising alkali metal acetates and/or alkaline earth metal acetates from the product mixture from the preparation of N,N-dimethylacetamide (DMAC) by reaction of methyl acetate (MeOAc) with dimethylamine (DMA) in the presence of a catalyst comprising N,N-dimethylacetamide (DMAC), methyl acetate (MeOAc), dimethylamine (DMA) and a catalyst, having the following process steps: level-regulated feeding of the product mixture as feed stream into an evaporation vessel of a forced circulation evaporator, flash evaporation of volatile components of the product mixture in the forced circulation evaporator to form a vapor phase comprising N,N-dimethylacetamide (DMAC) and precipitation of a solid, salt-containing phase comprising alkali metal acetates and/or alkaline earth metal acetates, recycling of the volatile components of the product mixture obtained after the flash evaporation, removal of a vapor phase comprising N,N-dimethylacetamide (DMAC) from the evaporation vessel as output stream, concentration of the solid, salt-containing phase comprising alkali metal acetates and/or alkaline earth metal acetates in the forced circulation evaporation circuit of the forced circulation evaporator, discharge of a substream comprising the solid, salt-containing phase comprising alkali metal acetates and/or alkaline earth metal acetates from the forced circulation evaporation circuit of the forced circulation evaporator, solid/liquid separation of the discharged substream in at least one separation apparatus into a solid, salt-containing phase comprising alkali metal acetates and/or alkaline earth metal acetates and a liquid phase, recycling of the liquid phase obtained after the solid/liquid separation into the forced circulation evaporation circuit as recycle stream, wherein the recycling of the volatile components of the product mixture obtained after the flash evaporation and of the solid, salt-containing phase comprising alkali metal acetates and/or alkaline earth metal acetates into the evaporation vessel is effected via an introduction section which ends within a range from 30 cm above the level surface to 20 cm below the level surface of the fill level of the evaporation vessel.

公开(公告)号：US20180361270A1

公开(公告)日：2018-12-20

申请号：US15741350

申请日：2016-06-29

Applicant: BASF SE

Inventor： Norbert ASPRION ,  Bernd HEIDA ,  Jan-Oliver WEIDERT ,  Ortmund LANG

IPC: B01D3/32 ,  B01D3/14 ,  B01D3/40

Abstract: A distillation device comprising a column for separating a feed stream into a head product stream, a bottom product stream and optionally one or more side extraction streams, having three or more cells in 5 series through which fluid flows, wherein at least the first cell is integrated into the bottom of the column, for multi-stage heating and partial evaporation of the liquid flowing through the cells with the exception of the liquid from the last cell in an evaporation stage.