GB475436A - Manufacture and application of tanning substances - Google Patents

Manufacture and application of tanning substances

Info

Publication number
GB475436A
GB475436A GB21454/36A GB2145436A GB475436A GB 475436 A GB475436 A GB 475436A GB 21454/36 A GB21454/36 A GB 21454/36A GB 2145436 A GB2145436 A GB 2145436A GB 475436 A GB475436 A GB 475436A
Authority
GB
United Kingdom
Prior art keywords
formaldehyde
acid
manufacture
application
sulphone
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
GB21454/36A
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.)
Novartis AG
Original Assignee
JR Geigy 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 JR Geigy AG filed Critical JR Geigy AG
Publication of GB475436A publication Critical patent/GB475436A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C3/00—Tanning; Compositions for tanning
    • C14C3/02—Chemical tanning
    • C14C3/08—Chemical tanning by organic agents
    • C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
    • C14C3/20—Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)

Abstract

The m : m<1>-dicresylsulphone obtainable in known manner from m-cresolsulphonic acid, or a mixture of dioxydiphenylsulphones containing that sulphone, is treated in an alkaline medium with formaldehyde and a sulphite, and the product is separated by acidification and then treated in an acid medium with an aromatic sulphonic acid and formaldehyde, as described in the parent Specification. Examples are given in which the sulphone from m-cresol or crude cresol is heated with aqueous caustic soda, formaldehyde, and sodium sulphite, and the product, after separation by acidification, is heated with formaldehyde and crude naphthalenesulphonic acid. Specification 458,028 is referred to.
GB21454/36A 1936-07-29 1936-08-04 Manufacture and application of tanning substances Expired GB475436A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH475436X 1936-07-29

Publications (1)

Publication Number Publication Date
GB475436A true GB475436A (en) 1937-11-19

Family

ID=4516142

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21454/36A Expired GB475436A (en) 1936-07-29 1936-08-04 Manufacture and application of tanning substances

Country Status (1)

Country Link
GB (1) GB475436A (en)

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