GB801723A - Purification of glycols by distillation - Google Patents

Purification of glycols by distillation

Info

Publication number
GB801723A
GB801723A GB16435/55A GB1643555A GB801723A GB 801723 A GB801723 A GB 801723A GB 16435/55 A GB16435/55 A GB 16435/55A GB 1643555 A GB1643555 A GB 1643555A GB 801723 A GB801723 A GB 801723A
Authority
GB
United Kingdom
Prior art keywords
glycol
water
pressure
crude
distillation
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
GB16435/55A
Inventor
Norvik Ackroyd
William Alexander O'neill
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
Priority to GB16435/55A priority Critical patent/GB801723A/en
Publication of GB801723A publication Critical patent/GB801723A/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
    • C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
    • C07C31/18—Polyhydroxylic acyclic alcohols
    • C07C31/20—Dihydroxylic alcohols
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
    • C07C31/18—Polyhydroxylic acyclic alcohols
    • C07C31/20—Dihydroxylic alcohols
    • C07C31/202—Ethylene glycol
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
    • C07C31/18—Polyhydroxylic acyclic alcohols
    • C07C31/20—Dihydroxylic alcohols
    • C07C31/205—1,3-Propanediol; 1,2-Propanediol

Abstract

Glycols are purified by adding water to the crude glycol in a quantity at least 2 per cent by weight of the glycol, heating the mixture, then distilling off the water, and finally distilling over the purified glycol. The products are very thermally-stable with regard to colour, and are suitable for use in the synthesis of aromatic linear polyesters. The glycol with the added water is preferably heated, under superatmospheric pressure if necessary, to a temperature above 200 DEG C. before undertaking the distillation step. In an example, ethylene glycol obtained as a by-product from the manufacture of polyethylene terephthalate, which is unsuitable in its crude state for further polyester production, is heated under superatmospheric pressure to 210 DEG C. with 50 per cent of its weight of water until a dark-coloured solid is deposited. The dilute glycol is then subjected to distillation at a pressure of 300 mm. Hg., using a fractionating column. After removing a low-boiling fraction, water is distilled off at a temperature of 75 DEG to 78 DEG C. The pressure is then reduced to 100 mm. to distil over the glycol. The product, when examined by a colour test, is found to have increased resistance to heat degradation compared with the original crude glycol.
GB16435/55A 1955-06-08 1955-06-08 Purification of glycols by distillation Expired GB801723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB16435/55A GB801723A (en) 1955-06-08 1955-06-08 Purification of glycols by distillation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16435/55A GB801723A (en) 1955-06-08 1955-06-08 Purification of glycols by distillation

Publications (1)

Publication Number Publication Date
GB801723A true GB801723A (en) 1958-09-17

Family

ID=10077270

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16435/55A Expired GB801723A (en) 1955-06-08 1955-06-08 Purification of glycols by distillation

Country Status (1)

Country Link
GB (1) GB801723A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245884A (en) * 1961-12-28 1966-04-12 Union Carbide Canada Ltd Process for the purification of polyethlene glycols
US3491161A (en) * 1966-07-18 1970-01-20 Jefferson Chem Co Inc Treatment of spent glycol
US3536768A (en) * 1967-09-18 1970-10-27 Jefferson Chem Co Inc Treatment of spent glycol

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245884A (en) * 1961-12-28 1966-04-12 Union Carbide Canada Ltd Process for the purification of polyethlene glycols
US3491161A (en) * 1966-07-18 1970-01-20 Jefferson Chem Co Inc Treatment of spent glycol
US3536768A (en) * 1967-09-18 1970-10-27 Jefferson Chem Co Inc Treatment of spent glycol

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