GB427423A - Stabilisation of aqueous formaldehyde solutions - Google Patents

Stabilisation of aqueous formaldehyde solutions

Info

Publication number
GB427423A
GB427423A GB29491/33A GB2949133A GB427423A GB 427423 A GB427423 A GB 427423A GB 29491/33 A GB29491/33 A GB 29491/33A GB 2949133 A GB2949133 A GB 2949133A GB 427423 A GB427423 A GB 427423A
Authority
GB
United Kingdom
Prior art keywords
per cent
hydrogen sulphide
stabilisation
aqueous formaldehyde
various amounts
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
GB29491/33A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB427423A publication Critical patent/GB427423A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/78—Separation; Purification; Stabilisation; Use of additives
    • C07C45/86—Use of additives, e.g. for stabilisation

Abstract

Aqueous solutions of formaldehyde are stabilized by adding hydrogen sulphide in a proportion appreciably less than an approximate saturation, preferably 5--10 per cent by weight of the formaldehyde solution. The stabilizing effect is not appreciably affected by small changes in acidity, the stabilizer being effective in the pH range of 2--8. Hydrogen sulphide may be used in conjunction with other stabilizers, e.g. methyl or ethyl alcohol. An example describes the effect of adding various amounts of hydrogen sulphide and, for purposes of comparison, various amounts of methyl alcohol to a 37 per cent aqueous formaldehyde solution containing 0,5 per cent of methyl alcohol.
GB29491/33A 1932-10-24 1933-10-24 Stabilisation of aqueous formaldehyde solutions Expired GB427423A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US427423XA 1932-10-24 1932-10-24

Publications (1)

Publication Number Publication Date
GB427423A true GB427423A (en) 1935-04-24

Family

ID=21923510

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29491/33A Expired GB427423A (en) 1932-10-24 1933-10-24 Stabilisation of aqueous formaldehyde solutions

Country Status (1)

Country Link
GB (1) GB427423A (en)

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