GB699358A - Improvements in and relating to the concentration of aqueous acetic acid solutions by distillation - Google Patents

Improvements in and relating to the concentration of aqueous acetic acid solutions by distillation

Info

Publication number
GB699358A
GB699358A GB3178/51A GB317851A GB699358A GB 699358 A GB699358 A GB 699358A GB 3178/51 A GB3178/51 A GB 3178/51A GB 317851 A GB317851 A GB 317851A GB 699358 A GB699358 A GB 699358A
Authority
GB
United Kingdom
Prior art keywords
per cent
acetic acid
column
diglycol
boiler
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
GB3178/51A
Inventor
George Anthony Rathbon Hartley
Charles Osburne Haughton
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.)
Akzo Nobel UK PLC
Original Assignee
Courtaulds PLC
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 Courtaulds PLC filed Critical Courtaulds PLC
Priority to GB3178/51A priority Critical patent/GB699358A/en
Priority to ES0201799A priority patent/ES201799A1/en
Publication of GB699358A publication Critical patent/GB699358A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C53/00—Saturated compounds having only one carboxyl group bound to an acyclic carbon atom or hydrogen
    • C07C53/08—Acetic acid
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
    • C07C51/46—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation by azeotropic distillation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/48—Separation; Purification; Stabilisation; Use of additives
    • C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
    • C07C67/54—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
    • C07C69/02—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen
    • C07C69/12—Acetic acid esters
    • C07C69/14—Acetic acid esters of monohydroxylic compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

<PICT:0699358/III/1> Aqueous solutions of acetic acid are concentrated by distilling them in the presence of one of the following solvents: - methoxy triglycol acetate, diglycol diacetate, methoxy diglycol acetate, ethoxy triglycol acetate, dimethoxy triglycol, dimethoxy diglycol. Water is obtained as distillate leaving a mixture of solvent and concentrated acid, which is then separated by fractional distillation, preferably under reduced pressure. The molecular ratio of solvent to the water present in the solution is preferably within the range from 1:1 to 5:1. The process is particularly applicable to the concentration of aqueous solutions containing up to 15 per cent of acetic acid where the usual azeotropic distillation processes are uneconomical. A 10 per cent aqueous acetic acid solution was passed continuously through pipe 3 into distillation column 1 heated by boiler 2; and diglycol diacetate (1 part by weight per part of aqueous acid) was introduced into the upper part of the column through pipe 4. The boiler 2 was maintained at a temperature of 120 DEG C, and the top of the column at 100 DEG C. The vapours from the head of the column were p passed to condenser 6, and water containing only 0.2 per cent of acetic acid was obtained as condensate. A mixture containing 9.2 per cent acetic acid, 89.4 per cent diglycol diacetate and 1.4 per cent water collected in boiler 2, and was passed through pipe 8 into column 9. The boiler 10 of column 9 was maintained at 160 DEG C, and the pressure within the column was maintained at 25 mm. Hg. by vacuum pump 14. A mixture containing 87 per cent of acetic acid and 13 per cent water was condensed in condenser 12, and collected in receiver 15. A mixture of 99.5 per cent of diglycol acetate and 0.5 per cent of acetic acid collected in boiler 10, and was returned to column 1 via pipe 4. The second Provisional Specification also refers to the use of diethoxy triglycol as solvent. Specifications 652,844, [Group IV(a)], and 670,751 are referred to.
GB3178/51A 1951-02-09 1951-02-09 Improvements in and relating to the concentration of aqueous acetic acid solutions by distillation Expired GB699358A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3178/51A GB699358A (en) 1951-02-09 1951-02-09 Improvements in and relating to the concentration of aqueous acetic acid solutions by distillation
ES0201799A ES201799A1 (en) 1951-02-09 1952-02-08 Improvements in and relating to the concentration of aqueous acetic acid solutions by distillation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3178/51A GB699358A (en) 1951-02-09 1951-02-09 Improvements in and relating to the concentration of aqueous acetic acid solutions by distillation

Publications (1)

Publication Number Publication Date
GB699358A true GB699358A (en) 1953-11-04

Family

ID=9753405

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3178/51A Expired GB699358A (en) 1951-02-09 1951-02-09 Improvements in and relating to the concentration of aqueous acetic acid solutions by distillation

Country Status (2)

Country Link
ES (1) ES201799A1 (en)
GB (1) GB699358A (en)

Also Published As

Publication number Publication date
ES201799A1 (en) 1954-02-01

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