GB980283A - Process for preparing very pure formaldehyde - Google Patents

Process for preparing very pure formaldehyde

Info

Publication number
GB980283A
GB980283A GB836861A GB836861A GB980283A GB 980283 A GB980283 A GB 980283A GB 836861 A GB836861 A GB 836861A GB 836861 A GB836861 A GB 836861A GB 980283 A GB980283 A GB 980283A
Authority
GB
United Kingdom
Prior art keywords
acid
formaldehyde
weight
reaction conditions
salt
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
GB836861A
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.)
Stamicarbon BV
Original Assignee
Stamicarbon BV
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 Stamicarbon BV filed Critical Stamicarbon BV
Publication of GB980283A publication Critical patent/GB980283A/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
    • C07C45/51—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition
    • C07C45/511—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition involving transformation of singly bound oxygen functional groups to >C = O groups
    • C07C45/515—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition involving transformation of singly bound oxygen functional groups to >C = O groups the singly bound functional group being an acetalised, ketalised hemi-acetalised, or hemi-ketalised hydroxyl group
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Catalysts (AREA)

Abstract

Formaldehyde is prepared by thermally decomposing formaldehyde polymer of low molecular weight or an aqueous formaldehyde solution containing at least 60% by weight of formaldehyde in the presence of at least one acid or salt showing an acid reaction under the reaction conditions, such acid or salt having under the reaction conditions a volatility not exceeding 1% of its weight per hour. Suitable acids are, for example, phosphoric acids, oleum, concentrated and dilute sulphuric acid, arsenic acid, boric acid, molybdic acid, selenic acid, uranic acid, tungstic acid, chlorsulphonic acid, oxalic acid, succinic acid, sebacic acid, palmitic acid, stearic acid, trichloro-acetic acid, p-toluene sulphonic acid, terephthalic acid, phthalic anhydride and cyclohexane carbonic acid. Suitable acid salts are, for example, ferric chloride, zinc chloride and monosodium and potassium phosphates. Preferably the process is carried out in the presence of an inert liquid medium. Suitable formaldehyde polymers for use in the process are, for example, paraformaldehyde and a - or b -polyoxymethylene. An aqueous formaldehyde solution for use in the process may be obtained by evaporating a more dilute solution until it contains at least 60% by weight of formaldehyde.
GB836861A 1960-03-07 1961-03-07 Process for preparing very pure formaldehyde Expired GB980283A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL249163 1960-03-07
NL252342 1960-06-04
NL254465 1960-08-02
NL260480 1961-01-25

Publications (1)

Publication Number Publication Date
GB980283A true GB980283A (en) 1965-01-13

Family

ID=27483661

Family Applications (1)

Application Number Title Priority Date Filing Date
GB836861A Expired GB980283A (en) 1960-03-07 1961-03-07 Process for preparing very pure formaldehyde

Country Status (4)

Country Link
BE (1) BE601010A (en)
CH (1) CH392480A (en)
GB (1) GB980283A (en)
SE (1) SE300971B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL284864A (en) * 1961-10-30

Also Published As

Publication number Publication date
CH392480A (en) 1965-05-31
SE300971B (en) 1968-05-20
BE601010A (en) 1961-09-07

Similar Documents

Publication Publication Date Title
GB1034680A (en) Improved method for preventing the formation of scale in distillation and evaporation apparatus and the like
GB937380A (en) A method for preparing unsaturated aliphatic nitriles
GB1068888A (en) Method of making di- and tri methylolalkanoic acids
GB980283A (en) Process for preparing very pure formaldehyde
GB1416365A (en) Process for the manufacture of drystalline ammonium phosphates
GB1079314A (en) Process for preparing n-vinyl compounds
GB879728A (en) Process for the manufacture of isoprene from 4.4-dimethylmetadioxane
GB1321563A (en) Preparation of 3,5-dinitrobenzotrifluoride compounds
GB1000881A (en) Process for making cyclohexanone-oxime
GB1178746A (en) Process of producing Acrylonitrile
GB723454A (en) Improvements in or relating to the manufacture of hydroquinone
GB1332080A (en) Alkylation process
GB931582A (en) Process for the preparation of dimethylhydroxylamine
GB1425309A (en) Process for the preparation of 5-nitro-1,4-naphthoquinone
US3215638A (en) Catalytic methanol solutions of aluminum chloride and zinc chloride
GB809314A (en) A process for the preparation of nitrogen-phosphorie acid compounds
GB1013897A (en) Hydrates of fluoro-ketones and their preparation
GB939115A (en) Improvements in or relating to the production of suberic acid
GB1221988A (en) Oxidation process
US2732381A (en) Lysidine salts
GB1060122A (en) Production of epoxy compounds
GB1020100A (en) Preparation of hydroxyalkane sulphonic acid salts and of sultones therefrom
GB1077374A (en) The manufacture of adipic acid
GB572260A (en) Improved process for the manufacture of adipic acid
GB1114430A (en) Manufacture of chlorine