Dsm IP Assets B.v.

Roche Vitamins Inc.

Sulzer Chemtech Ag

Sulzer Management Ag

Juan Ramon Herguijuela

Angela Wildermann

Werner Pietzonka

Thomas Wolf

Volkmar Boesch

Thomas Clavey

Johann Riegl

Jörg Koch

Thomas Netscher

Konrad Bruggemann

A liquid-liquid extraction system () adapted for the flow of two or more liquids therein is disclosed. The system comprises a mixer settler sub-system () and a counter-current liquid-liquid extraction column (). The sub-system () comprises one or more mixer settlers () connected in series, and the column () comprises either a mixing section () comprising an agitation means () and/or a static section () comprising an internal (). The first outlet () of the mixer settler sub-system () is in fluid communication with the first inlet () of the column () and the second inlet () of the mixer settler sub-system () is in fluid communication with the second inlet () of the counter-current liquid-liquid extraction column (). The invention further relates to a counter-current liquid-liquid extraction process for using said system. The present invention further relates also to the use of the system () or process in removing aromatic compounds from organic streams, in treating an oil stream of a refinery, or in a liquid-liquid extraction process having at least two feed streams of different viscosity, similar density, or low interfacial tension.

Liquid-liquid extraction system and process for use thereof

A process for the rectification of mixtures of high-boiling air- and/or temperature-sensitive substances which require a high separation efficiency is proposed, in particular a process for the working-up of a VE- or VEA-containing product stream. The process includes a first purification stage to separate low-boiling products and unspecified isomers of the useful product from the product stream virtually without loss of useful product and a second purification stage for removing the useful product in a stream having a purity of &#x3e;97% by weight and a further stream having a purity of &#x3e;92% by weight.

Process for the rectification of mixtures of high-boiling air- and/or temperature-sensitive useful products

According to the invention, a process for the rectification of mixtures of high-boiling air- and/or temperature-sensitive substances which require a high separation efficiency is proposed, in particular a process for the working-up of a VE- or VEA-containing product stream. The process is characterized in particular in that, in a first purification stage, low-boiling products and unspecified isomers of the useful product are separated from the product stream virtually without loss of useful product and that, in a second purification stage, the useful product is removed in a stream having a purity of &#x3e;97% by weight and a further stream having a purity of &#x3e;92% by weight. A preferred embodiment of the process serves for working up VEA, in which the loss of useful product in the first purification stage is less than 5%, based on that amount of VEA in the feed which is added to the purification stage per unit time. Furthermore, the first purification stage may comprise a rectification column (), from the top () of which the low-boiling products and the unspecified isomers of VEA are taken off, a stream containing the useful product in purified form being taken off at the side () and/or at the bottom () of the column ().

According to the invention, a process for the rectification of mixtures of high-boiling air- and/or temperature-sensitive substances which require a high separation efficiency is proposed, in particular a process for the working-up of a VE- or VEA-containing product stream. The process is characterized in particular in that, in a first purification stage, low-boiling products and unspecified isomers of the useful product are separated from the product stream virtually without loss of useful product and that, in a second purification stage, the useful product is removed in a stream having a purity of &#x3e;97% by weight and a further stream having a purity of &#x3e;92% by weight. A preferred embodiment of the process serves for working up VEA, in which the loss of useful product in the first purification stage is less than 5%, based on that amount of VEA in the feed which is added to the purification stage per unit time. Furthermore, the first purification stage may comprise a rectification column (), from the top (Ia) of which the low-boiling products and the unspecified isomers of VEA are taken off, a stream containing the useful product in purified form being taken off at the side () and/or at the bottom (Ib) of the column ().

Process for the rectification of mixtures of high-boiling air-and/or temperature-sensitive useful products

A process for the preparation of acetals and ketals by reacting an aldehyde or ketone with an alcohol in the presence of an acidic catalyst and removing water by pervaporation. Manufacturing equipment for the preparation of acetals and ketones is also provided.

Process and manufacturing equipment for preparing acetals and ketals

A process for the preparation of acetals and ketals by reacting an aldehyde or Ketone with an alcohol in the presence of solid acid and removing water by pervaporation. Manufacturing equipment for the preparation of acetals and ketones is also provided.

Process of manufacturing equipment for preparing acetals and ketals

A method of producing .alpha.-tocopherol from non-.alpha.-tocopherols is disclosed. In the disclosed method, non-.alpha.-tocopherols are hydroxymethylated and reduced to .alpha.-tocopherol in a single step by reacting formaldehyde or a formaldehyde-producing compound with the non-.alpha.-tocopherol under catalytic reducing conditions in a reaction mixture containing the non-.alpha.-tocopherol, formaldehyde or formaldehyde-producing compound and boric acid or a boric acid-producing compound dispersed in a solvent of an azeotropic mixture of trimethyl borate and methanol and a non-polar organic solvent.

Growing community of inventors

Auggen, Germany

Juan Ramon Herguijuela