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DE698642C - Process for the separation of mixtures of polyhydric alcohols - Google Patents

Process for the separation of mixtures of polyhydric alcohols

Info

Publication number
DE698642C
DE698642C DE1937I0057663 DEI0057663D DE698642C DE 698642 C DE698642 C DE 698642C DE 1937I0057663 DE1937I0057663 DE 1937I0057663 DE I0057663 D DEI0057663 D DE I0057663D DE 698642 C DE698642 C DE 698642C
Authority
DE
Germany
Prior art keywords
polyhydric alcohols
mixtures
separation
alcohols
xylene
Prior art date
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
DE1937I0057663
Other languages
German (de)
Inventor
Dr Alfons Apel
Dr Erich Berger
Dr Karl Schoenemann
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DE1937I0057663 priority Critical patent/DE698642C/en
Application granted granted Critical
Publication of DE698642C publication Critical patent/DE698642C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
    • C07C29/86—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by liquid-liquid treatment

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Verfahren zur Trennung von Gemischen mehrwertiger Alkohole Gemische mehrwertilger Alkohole konnte man bisher nur durch Umsieden -trennen. Dies-es Verfahren ist wegen der EmpfindlicIikeit der Alkohole gegen Wärme nicht einfach durchzuführen.Process for the separation of mixtures of polyhydric alcohols mixtures So far, polyvalent alcohols could only be separated by boiling. This method is not easy to carry out because of the sensitivity of alcohols to heat.

Es wurde nun gefunden, daß man Glykol und Glycerin aus Gemischen mit höheren mehrwertigünAlkoholenabtrennen 1,ann, wenn man aus den zu trennenden Gernischen. d,.*e höheren mehrwertigen Alkohole in dcrWäriiie mit Xylo,1, Tetrahydronaphthalin, Dekahydranaphthalin, Cyclohexanon oder Methylcyclohexanon auszieht, durch Schichten vorn Gly- kol und Glycerin trennt und die mehrwertigen Alkohole durch Abk-Wilen aus dem Lösungsmittel abschei(Ict. Diese Arbeitsweise lä.ßt sich. beträchtlich einfacher durchführen als das umstündliche Umsieden. Dank- der geringen Löslichkeit des Erythrits und der anderen höheren Alkohole in den kalten Lösemitteln braucht man diese nicht abzudampfen, sondern :man kann den Erythrit usw. einfach durch Abkühlen gewinnen. Der noch in , Lösung bleibende I-',est stört bei der erneuten Verwendung des Lös,emittels für den vo.rIiegenden Zweck nicht. Am besten führt man das Lös-emittel im Kreislauf.It has now been found that glycol and glycerol can be separated from mixtures with higher polyvalent alcohols if one is made from the mixtures to be separated. d. * e higher polyhydric alcohols in dcrWäriiie with Xylo, 1, tetrahydronaphthalene, Dekahydranaphthalin, cyclohexanone or methylcyclohexanone pulls out kol by layers front Gly, separating glycerol and polyhydric alcohols by Abbr-Wilen from the solvent abschei (Ict. This procedure Can be carried out considerably more easily than the hourly reboiling. Thanks to the low solubility of the erythritol and the other higher alcohols in the cold solvents, these do not need to be evaporated, but: the erythritol, etc. can be obtained simply by cooling remaining in, solution I - 'est does not interfere with the re-use of Loes, emittels for the purpose vo.rIiegenden best leads to the Loes Eav in the circuit..

Beispi,cl Ein Gemisch aus 4o Teilen Erytlirit tind 6o Teilen Glyccrin wird nacheinander mit 5oo, 2oo und schließlich mit ioo Teilm heißem Xylol geschüttelt. Die leichtere Xyloll-ösung kann nach dem Absitzen jedesmal leicht oben abgezogen werden. Zum Schluß, bleiben 4o Teile trythritfreies Gly- cerin zuräck. Der Erythrit scheidet sich beim Abkühlen des Xylols auf io' zum größten Teil wieder aus. Der no-ch in Lösung gebliebene Rest kann durch Abdampfen des Xylo-Is gewonnen -werden; zweckmäßig verwendet man jedoch dieses Xylol für einen weiteren Arbeitsgang.For example, a mixture of 40 parts of erythritol and 60 parts of glycine is shaken in succession with 500, 200 and finally with 100 parts of hot xylene. The lighter xylene solution can be easily peeled off at the top each time it has settled. In the end, 40 parts of trythritol- free glycerin remain. Most of the erythritol is precipitated again when the xylene cools down to io '. The residue still remaining in solution can be obtained by evaporating the xylo-is; however, it is expedient to use this xylene for a further operation.

CC.

Claims (1)

PATEINTANSPRUCII - Verfahren zum Abtrennen von Glykol -und Glycerin aus Gemischen nüt höheren mehrwertigen Alkoholen, dadurch gekennzeichnet, daß man aus dem Gemisch die höheren mehrivertigen Alkohole in der-Wärme mit Xylol, Tetrahydronaphtbalin, Dekahydronaphthalin, Cyc'o,-exanoii ader Methylcyclohexanon auszieht, durch Schichten von dem Glykol und Glycerin trennt und die mehrwertigen Alkohole durch Ab- kühlen aus dem Lösungsmittel abscheidet.PATEINTANSPRUCII - Process for separating glycol and glycerine from mixtures of higher polyhydric alcohols, characterized in that the higher polyhydric alcohols are extracted from the mixture in the heat with xylene, tetrahydronaphtbalin, decahydronaphthalene, cyclo-exanoii or methylcyclohexanone, separated by layers of the glycol and glycerin, and polyhydric alcohols by the waste cool from the solvent is deposited.
DE1937I0057663 1937-04-11 1937-04-11 Process for the separation of mixtures of polyhydric alcohols Expired DE698642C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1937I0057663 DE698642C (en) 1937-04-11 1937-04-11 Process for the separation of mixtures of polyhydric alcohols

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1937I0057663 DE698642C (en) 1937-04-11 1937-04-11 Process for the separation of mixtures of polyhydric alcohols

Publications (1)

Publication Number Publication Date
DE698642C true DE698642C (en) 1940-11-14

Family

ID=7194609

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1937I0057663 Expired DE698642C (en) 1937-04-11 1937-04-11 Process for the separation of mixtures of polyhydric alcohols

Country Status (1)

Country Link
DE (1) DE698642C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2503035A1 (en) * 1975-01-25 1976-07-29 Dynamit Nobel Ag Uncontrolled discharge preventing device - has wire conductor inert to flow medium inserted in pipe or valve with point near possible discharge
EP3019461A1 (en) * 2013-08-19 2016-05-18 REG Life Sciences, LLC Production of partially refined waste glycerol

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2503035A1 (en) * 1975-01-25 1976-07-29 Dynamit Nobel Ag Uncontrolled discharge preventing device - has wire conductor inert to flow medium inserted in pipe or valve with point near possible discharge
EP3019461A1 (en) * 2013-08-19 2016-05-18 REG Life Sciences, LLC Production of partially refined waste glycerol

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