GB421676A - Improvements in the manufacture and production of diacetyl - Google Patents

Improvements in the manufacture and production of diacetyl

Info

Publication number
GB421676A
GB421676A GB2744533A GB2744533A GB421676A GB 421676 A GB421676 A GB 421676A GB 2744533 A GB2744533 A GB 2744533A GB 2744533 A GB2744533 A GB 2744533A GB 421676 A GB421676 A GB 421676A
Authority
GB
United Kingdom
Prior art keywords
acid
diacetyl
acetylene
solution
mercuric
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
GB2744533A
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 GB2744533A priority Critical patent/GB421676A/en
Publication of GB421676A publication Critical patent/GB421676A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
    • C07C49/04—Saturated compounds containing keto groups bound to acyclic carbon atoms
    • C07C49/12—Ketones containing more than one keto 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
    • C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
    • C07C45/31—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with compounds containing mercury atoms, which may be regenerated in situ, e.g. by oxygen

Landscapes

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

Abstract

Diacetyl is manufactured by causing divinyl (butadiene) or vinyl acetylene or gases containing them, e.g. those formed as bye-products in the preparation of acetylene in the electric arc, to react with acid aqueous solutions of mercuric salts and working up the reaction products while acid, preferably after heating for some time, e.g. to 100 DEG C. Practically any acids other than halogen hydracids may be employed, preferably inorganic acids, e.g. sulphuric, phosphoric or nitric acid. The process may be carried out continuously by leading the vinyl compounds downwards through a tower charged with a warm acid solution of a mercury salt, the effluent gases being led through a condenser in which most of the diacetyl is condensed, then through an aqueous solvent such as water or sodium bisulphite solution to remove the rest of the diacetyl, and finally returned to the tower. The amount of mercuric salt should preferably correspond to at least four molecular proportions of HgO to one of vinyl acetylene, and even more in the case of divinyl. There is first formed a precipitate of a mercury compound from which diacetyl may be liberated by means of acids, including halogen hydroacids. In examples: (1) vinylacetylene is passed at 15 DEG C. into a solution of mercuric oxide in dilute sulphuric acid, and the reaction mixture is transferred to a distillation apparatus, heated to 90--100 DEG C., acidified with hydrochloric acid and distilled; (2) a gas containing vinyl acetylene and diacetylene, obtained by strongly cooling acetylene obtained in the electric arc, is similarly treated; (3) a gas as in (2) is reacted, by a continuous process as described above, with a solution of mercuric oxide in aqueous phosphoric acid; (4) butadiene is treated by the process of (1).
GB2744533A 1933-10-05 1933-10-05 Improvements in the manufacture and production of diacetyl Expired GB421676A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2744533A GB421676A (en) 1933-10-05 1933-10-05 Improvements in the manufacture and production of diacetyl

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2744533A GB421676A (en) 1933-10-05 1933-10-05 Improvements in the manufacture and production of diacetyl

Publications (1)

Publication Number Publication Date
GB421676A true GB421676A (en) 1934-12-28

Family

ID=10259704

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2744533A Expired GB421676A (en) 1933-10-05 1933-10-05 Improvements in the manufacture and production of diacetyl

Country Status (1)

Country Link
GB (1) GB421676A (en)

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