DE1014975B - Process for cleaning glycol - Google Patents

Process for cleaning glycol

Info

Publication number
DE1014975B
DE1014975B DEI10907A DEI0010907A DE1014975B DE 1014975 B DE1014975 B DE 1014975B DE I10907 A DEI10907 A DE I10907A DE I0010907 A DEI0010907 A DE I0010907A DE 1014975 B DE1014975 B DE 1014975B
Authority
DE
Germany
Prior art keywords
glycol
sodium hypochlorite
distillation
cleaning
glycols
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.)
Pending
Application number
DEI10907A
Other languages
German (de)
Inventor
Horace Spivey
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of DE1014975B publication Critical patent/DE1014975B/en
Pending 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
    • C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Detergent Compositions (AREA)

Description

DEUTSCHESGERMAN

Aromatische, lineare Polyester werden durch Umsetzung eines Glykols mit Terephthalsäure oder einem niederen aliphatischen Ester derselben hergestellt. Solche Polyester besitzen hohen technischen Wert als Fasern, Filme u. dgl., da sie einen hohen Schmelzpunkt und auch in starken Lösungsmitteln eine geringe Löslichkeit aufweisen. Der bevorzugte dieser Polyester ist Polyäthylenterephthalat. Aromatic, linear polyesters are made by reacting a glycol with terephthalic acid or a lower aliphatic esters thereof. Such polyesters have a high technical value as fibers, Films and the like because they have a high melting point and low solubility even in strong solvents. The preferred of these polyesters is polyethylene terephthalate.

Zur Herstellung von Polyesterfasern und -filmen müssen die miteinander umzusetzenden Stoffe in hohem Reinheitsgrad vorliegen, um einen Polyester von guter Farbe zu erhalten.For the production of polyester fibers and films, the substances to be reacted with one another have to be highly Degree of purity in order to obtain a polyester of good color.

Es wurde nun gefunden, daß Glykole durch Destillation mit Natriumhypochlorit, vorzugsweise mit alkalischem Natriumhypochlorit, gereinigt werden können und daß aromatische lineare Polyester, die aus mit Natriumhypochlorit destillierten Glykolen hergestellt sind, eine bessere Farbe aufweisen als diejenigen, die aus technischen Glykolsorten hergestellt sind. Die mit Natriumhypochlorit destillierten Glykole besitzen eine viel hellere Farbe als technische Glykolsorten.It has now been found that glycols by distillation with sodium hypochlorite, preferably with alkaline Sodium hypochlorite, and that aromatic linear polyester made with sodium hypochlorite Distilled glycols are made of better color than those made from technical Glycols are made. The glycols distilled with sodium hypochlorite are much lighter in color Color as technical glycols.

Beispielexample

100 Teile technisches Äthylenglykol werden in eine Destilliervorrichtung eingebracht, und es werden 0,25 Teile Natronlauge (Dichte = 1,35) zusammen mit 0,175 Teilen einer 8%igen Natriumhypochloritlösung zugesetzt. Die Destilliervorrichtung wird unter ein Vakuum von 40 mm Hg gesetzt und mit Wasserdampf beheizt, der unter einem Druck von 5,6 kg/cm2 steht. Die Ventile der Destillatleitung der Destillationsvorrichtung werden auf totalen Rückfluß eingestellt, und der Inhalt wird 1J2 Stunde unter Rückfluß erhitzt, bis sich Gleichgewichtsbedingungen eingestellt haben.100 parts of technical grade ethylene glycol are placed in a distillation device, and 0.25 parts of sodium hydroxide solution (density = 1.35) are added together with 0.175 parts of an 8% sodium hypochlorite solution. The still is placed under a vacuum of 40 mm Hg and heated with steam which is under a pressure of 5.6 kg / cm 2 . The valves of the distillate line of the distillation apparatus can be adjusted to total reflux, and the contents are heated for 1 hour under reflux J2, have set until equilibrium conditions.

Die Destillation wird mit einem Rückflußverhältnis von 4: 1 begonnen, wobei man in regelmäßigen Zeitabständen Destillatproben auf ihren Siedebereich prüft. Sobald der Siedebereich von 5 bis 95 ecm sich um weniger als 1,5° ändert, wird das Rückflußverhältnis auf 1:1 herabgesetzt und die Destillation fortgesetzt, bis der Siedebereich 1,5° übersteigt. An diesem Punkt erhöht man Verfahren zur Reinigung von GlykolThe distillation is started with a reflux ratio of 4: 1, taking place at regular time intervals Checks distillate samples for their boiling range. As soon as the boiling range is from 5 to 95 ecm down to less changes than 1.5 °, the reflux ratio becomes 1: 1 and the distillation continued until the boiling range exceeds 1.5 °. At this point you increase Process for cleaning glycol

Anmelder:Applicant:

Imperial Chemical Industries Limited,
LondonImperial Chemical Industries Limited,
London

Vertreter: Dipl.-Ing. A. Bohr, München 5,Representative: Dipl.-Ing. A. Bohr, Munich 5,

Dr.-Ing. H. Fincke,Dr.-Ing. H. Fincke,

Berlin-Lichterfelde West, Freiwaldauer Weg 28,
und Dipl.-Ing. H. Bohr, München 5, Patentanwälte Berlin-Lichterfelde West, Freiwaldauer Weg 28,
and Dipl.-Ing. H. Bohr, Munich 5, patent attorneys

Beanspruchte Priorität:Claimed priority:

Großbritannien vom 24. November 1954Great Britain November 24, 1954

und 2. November 1955and November 2nd, 1955

Horace Spivey, Blackley (Großbritannien),
ist als Erfinder genannt wordenHorace Spivey, Blackley (Great Britain),
has been named as the inventor

das Rückflußverhältnis wieder auf 4:1, und sobald der Siedebereich wiederum 1,5° übersteigt, ist die Destillation beendet und der Rückstand wird verworfen.the reflux ratio back to 4: 1, and as soon as the boiling range again exceeds 1.5 °, the distillation is ended and the residue is discarded.

Die Farbe des destillierten Glykols ist viel heller als diejenige des ursprünglichen technischen Glykols.The color of the distilled glycol is much lighter than that of the original technical glycol.

Claims (3)

Patentansprüche:Patent claims: 1. Verfahren zum Reinigen von Glykol, dadurch gekennzeichnet, daß man das Glykol in Gegenwart von Natriumhypochlorit destilliert.1. A method for cleaning glycol, characterized in that the glycol is in the presence distilled from sodium hypochlorite. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man alkalisches Natriümhypochlorit verwendet.2. The method according to claim 1, characterized in that alkaline sodium hypochlorite used. 3. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß man das Glykol unter vermindertem Druck destilliert.3. The method according to claim 1 and 2, characterized in that the glycol is reduced under Distilled pressure.
DEI10907A 1954-11-24 1955-11-18 Process for cleaning glycol Pending DE1014975B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1014975X 1954-11-24

Publications (1)

Publication Number Publication Date
DE1014975B true DE1014975B (en) 1957-09-05

Family

ID=10868068

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI10907A Pending DE1014975B (en) 1954-11-24 1955-11-18 Process for cleaning glycol

Country Status (1)

Country Link
DE (1) DE1014975B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1112058B (en) * 1958-11-10 1961-08-03 Canadian Chemical Company Ltd Process for purifying pentaerythritol
DE1156773B (en) * 1959-09-03 1963-11-07 Halcon International Inc Process for purifying glycerin
DE1243663B (en) * 1964-10-09 1967-07-06 Wacker Chemie Gmbh Process for the purification of saturated alcohols

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1112058B (en) * 1958-11-10 1961-08-03 Canadian Chemical Company Ltd Process for purifying pentaerythritol
DE1156773B (en) * 1959-09-03 1963-11-07 Halcon International Inc Process for purifying glycerin
DE1243663B (en) * 1964-10-09 1967-07-06 Wacker Chemie Gmbh Process for the purification of saturated alcohols

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