Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB35390/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
Deutsche Gold und Silber Scheideanstalt
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Degussa GmbH, Deutsche Gold und Silber ScheideanstaltfiledCriticalDegussa GmbH
Publication of GB844829ApublicationCriticalpatent/GB844829A/en
C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
C07C31/18—Polyhydroxylic acyclic alcohols
C07C31/24—Tetrahydroxylic alcohols, e.g. pentaerythritol
C07C31/245—Pentaerythritol
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Chemical & Material Sciences
(AREA)
Organic Chemistry
(AREA)
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
Pentaerythritol and/or dipentaerythritol are obtained from an aqueous mixture, obtained by the condensation of formaldehyde and acetaldehyde in an alkaline medium, by dehydrating the mixture as far as possible, heating the residue with a monohydric aliphatic alcohol containing from 1 to 8 carbon atoms, separating the insoluble substance, and recovering the pentaerythritol and/or dipentaerythritol by crystalisation from the alcoholic solution. Preferably the starting material is dehydrated by azeotropic distillation after the addition of an amount of the same alcohol as is to be used later to dissolve the pentaerythritol and/or dipentaerythritol.
GB35390/58A1957-11-051958-11-04Process for obtaining pentaerythritol and dipentaerythritol
ExpiredGB844829A
(en)
Improvements in or relating to a process for separately recovering an aldehyde or ketone and an aqueous solution of the corresponding alcohol from an aqueous mixture containing the aldehyde or ketone and the alcohol
Improvements in the obtaining of 2,4 diclorofenoxiacºtico and 2,4,5 triclorofenoxiacºtico acids, and their salts or esteres (Machine-translation by Google Translate, not legally binding)