GB371374A - Improvements in and relating to the catalytic reduction of indigo - Google Patents

Improvements in and relating to the catalytic reduction of indigo

Info

Publication number
GB371374A
GB371374A GB193631A GB193631A GB371374A GB 371374 A GB371374 A GB 371374A GB 193631 A GB193631 A GB 193631A GB 193631 A GB193631 A GB 193631A GB 371374 A GB371374 A GB 371374A
Authority
GB
United Kingdom
Prior art keywords
parts
indigo
glycol
ethyl alcohol
sugar
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
GB193631A
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.)
WILFRED VICTOR STUBBINGS
Imperial Chemical Industries Ltd
Original Assignee
WILFRED VICTOR STUBBINGS
Imperial Chemical Industries Ltd
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 WILFRED VICTOR STUBBINGS, Imperial Chemical Industries Ltd filed Critical WILFRED VICTOR STUBBINGS
Priority to GB193631A priority Critical patent/GB371374A/en
Publication of GB371374A publication Critical patent/GB371374A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
    • C09B67/0071—Process features in the making of dyestuff preparations; Dehydrating agents; Dispersing agents; Dustfree compositions
    • C09B67/0077—Preparations with possibly reduced vat, sulfur or indigo dyes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Catalysts (AREA)

Abstract

The conversion of alkaline indigo paste into the leuco compound by means of hydrogen and a nickel catalyst is facilitated by the addition of an alcoholic compound such as ethyl alcohol, glycol, or sugar. For example, 5 parts of cane sugar or glycol or 16 parts of ethyl alcohol may be added to a paste containing 16 parts of indigo in 44 parts of caustic soda solution. The continuous hydrogenation process described in Specification 328,104, [Class 1 (i), Chemical processes &c.], may be used.ALSO:The conversion of alkaline indigo paste into the leuco compound by means of hydrogen and a nickel catalyst is facilitated by the addition of an alcoholic compound such as ethyl alcohol, glycol, or sugar. For example, 5 parts of cane sugar or glycol or 16 parts of ethyl alcohol may be added to a paste containing 16 parts of indigo in 244 parts of caustic soda solution. The continuous hydrogenation process described in Specification 328,104, [Class 2 (iii), Dyes &c.], may be used.
GB193631A 1931-01-20 1931-01-20 Improvements in and relating to the catalytic reduction of indigo Expired GB371374A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB193631A GB371374A (en) 1931-01-20 1931-01-20 Improvements in and relating to the catalytic reduction of indigo

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB193631A GB371374A (en) 1931-01-20 1931-01-20 Improvements in and relating to the catalytic reduction of indigo

Publications (1)

Publication Number Publication Date
GB371374A true GB371374A (en) 1932-04-20

Family

ID=9730626

Family Applications (1)

Application Number Title Priority Date Filing Date
GB193631A Expired GB371374A (en) 1931-01-20 1931-01-20 Improvements in and relating to the catalytic reduction of indigo

Country Status (1)

Country Link
GB (1) GB371374A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600072671A1 (en) * 2016-07-12 2018-01-12 Andreina Paderno PROCESS OF DYEING PERFECTED

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600072671A1 (en) * 2016-07-12 2018-01-12 Andreina Paderno PROCESS OF DYEING PERFECTED

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