GB348944A - Improvements in the concentration of aqueous formic acid - Google Patents

Improvements in the concentration of aqueous formic acid

Info

Publication number
GB348944A
GB348944A GB2043730A GB2043730A GB348944A GB 348944 A GB348944 A GB 348944A GB 2043730 A GB2043730 A GB 2043730A GB 2043730 A GB2043730 A GB 2043730A GB 348944 A GB348944 A GB 348944A
Authority
GB
United Kingdom
Prior art keywords
formic acid
acid
formamide
aqueous formic
concentration
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
GB2043730A
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 GB2043730A priority Critical patent/GB348944A/en
Publication of GB348944A publication Critical patent/GB348944A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/06—Preparation of carboxylic acids or their salts, halides or anhydrides from carboxylic acid amides
    • 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
    • C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification

Abstract

Aqueous formic acid is concentrated by mixing with formamide and a concentrated or gaseous mineral acid and heating to 60-80 DEG C., the water being consumed in the hydrolysis of the formamide. Nitric acid may be used, but a non-oxidizing acid is preferred. Examples describe the use of sulphuric and hydrochloric acids. The formic acid may be distilled under reduced pressure, the ammonium salt present being first separated, if desired. When reduced pressure is employed, any formic acid not condensed in the condenser may be intercepted in a washer containing water or formamide placed between the condenser and the suction apparatus.
GB2043730A 1930-07-05 1930-07-05 Improvements in the concentration of aqueous formic acid Expired GB348944A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2043730A GB348944A (en) 1930-07-05 1930-07-05 Improvements in the concentration of aqueous formic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2043730A GB348944A (en) 1930-07-05 1930-07-05 Improvements in the concentration of aqueous formic acid

Publications (1)

Publication Number Publication Date
GB348944A true GB348944A (en) 1931-05-21

Family

ID=10145929

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2043730A Expired GB348944A (en) 1930-07-05 1930-07-05 Improvements in the concentration of aqueous formic acid

Country Status (1)

Country Link
GB (1) GB348944A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3307729B1 (en) * 2015-06-15 2020-09-02 GlaxoSmithKline Intellectual Property Development Limited Nrf2 regulators

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3307729B1 (en) * 2015-06-15 2020-09-02 GlaxoSmithKline Intellectual Property Development Limited Nrf2 regulators

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