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Evonik Operations GmbH
Original Assignee
Degussa GmbH
Deutsche Gold und Silber Scheideanstalt
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Priority claimed from DE19702048790external-prioritypatent/DE2048790C3/en
Application filed by Degussa GmbH, Deutsche Gold und Silber ScheideanstaltfiledCriticalDegussa GmbH
Application grantedgrantedCritical
Publication of FR2111014A5publicationCriticalpatent/FR2111014A5/en
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
(I) is isolated from mixtures of isomeric isoleucine by (a) subjecting the mixture to multistage fractional crystallisation from aqs. soln., the mother liquor being passed in countercurrent; or (b) epimerising the isomer mixture by heating in alkali metal hydroxide soln., separating by adjusting the pH to ca. 5.5, and treating the mixture obtained as in (a).
FR7135854A1970-10-051971-10-05Isolation of dl-isoleucine - by multistage fractional crystallisation with countercurrent passage of mother liquors
ExpiredFR2111014A5
(en)
Process for the production of anhydrous potassium magnesium sulfate material with low hygroscopicity from hydrated potassium magnesium sulfate material
Process for the preparation of mixtures of ortho-, meta- and parater-phenyl, in which the content of one or two of the isomers is less than 10% by weight.