US1027836A - Reducing indigo coloring-matters. - Google Patents

Reducing indigo coloring-matters. Download PDF

Info

Publication number
US1027836A
US1027836A US56598710A US1910565987A US1027836A US 1027836 A US1027836 A US 1027836A US 56598710 A US56598710 A US 56598710A US 1910565987 A US1910565987 A US 1910565987A US 1027836 A US1027836 A US 1027836A
Authority
US
United States
Prior art keywords
iron
matters
indigo
reducing
alkali
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 - Lifetime
Application number
US56598710A
Inventor
Wilhelm Gaus
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Priority to US56598710A priority Critical patent/US1027836A/en
Application granted granted Critical
Publication of US1027836A publication Critical patent/US1027836A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C09B9/00—Esters or ester-salts of leuco compounds of vat dyestuffs

Definitions

  • iron tnrninga even after having been freed from oily impurities, does; not always produce the beat in salts, althougl'i the iron powder hehavca normally if the reduction be carried out in the presence of acid. I have tound that the said unreliability can be. remedied and good results be alwaya obtained when reducing indigo, or similar coloring matter. with iron powder in-the preaence of alkali. or an alkaline. salt. as aforesaid it the iron pow der. before being; need for the reduction. be
  • This invention can be applied to iron powder generally and to iron residues, such as are obtained in chemical. processes and und-ar other conditions.
  • iron satisfactorily to reduce the indigo or similar coloring matter may be dne to a thin layer of ferric oxid covering the iron. and that the acid dissolves away this layer of ferric oxid. so that the n'ietallic. iron can then exert its reducing eti'cot upon the indigo. or similar coloring matter.

Description

UNETED tdith iftiilti i \VILHELIYI GAUS. OF LUD'VTIGSHAFEN-ON-THE-RHINE. GERIVKANY. ASE
NOR. "E0 BABI- SCHE ANILIN & SODA FABRIK. OF LUDV IGSHAE'EN-ON-EIil l-Ri'tlh ll ULHDJLANY. A
CGRPOBATION.
' REDUCING INDIGO t .ttti'i'fifli. Spes fication o No Drawing.
caustic alkali, and the spccil'lcation of Letters Patent No. 84-3566 describes" a modification ot the a'lmcsaid prom- 15 in whielra. part. or the whole. of tl alk: ii in replaced by an alkali salt of indigo white. or by an alkali carbonate. or alkali )linH ihate. or al' 'kalisrdtid. When either of thc atoresaid processes i;-: being carried out. it has been found in some cases that the acti n of the iron powder in' so tar unreliable that it will aometiines happen that the iron pmvder (say, powdered cast. iron tnrninga), even after having been freed from oily impurities, does; not always produce the beat in salts, althougl'i the iron powder hehavca normally if the reduction be carried out in the presence of acid. I have tound that the said unreliability can be. remedied and good results be alwaya obtained when reducing indigo, or similar coloring matter. with iron powder in-the preaence of alkali. or an alkaline. salt. as aforesaid it the iron pow der. before being; need for the reduction. be
treated Witn an acid.
This invention can be applied to iron powder generally and to iron residues, such as are obtained in chemical. processes and und-ar other conditions.
It possible that the. inability of the.
iron satisfactorily to reduce the indigo or similar coloring matter may be dne to a thin layer of ferric oxid covering the iron. and that the acid dissolves away this layer of ferric oxid. so that the n'ietallic. iron can then exert its reducing eti'cot upon the indigo. or similar coloring matter.
The following example will serve toillus- Application filed June 9,
COLORING-IVLFLET E1 53.
1 Letters ate atria ted 352:3 MM 2.
1910. Serial No. 565,987.
{tratc further-the natnrto'l" my invention and how it can he carried into practical ctfeet. but the invention W110i. contincd to this example; The part: are by weight. 'tv'tir three hundred part1-i ot very finely ground east-iron turnings (atter hating l'reed thcnn. it necensary. trom oil by treatiire them with carbon tetrachlorid) with one thousand parts of water, and then, while. well agi tating the mixture, add eighteen per cer. sulfuric acid. until a conaidcrable evolution of hydrogen commences. Then allow the. iron powder to settle. remove the acid liquor and wash the iron several times with water. The iron paste so obtained can be employed in the reduction ot indigo, or similar coloring matter in the manner described in the aforesaid spec-i iication.
N ow What; 1' claim is: i 1. he process of reducing indigo colon matters by means of iron which conts in first pickling the iron with an acid and then heating the indigo coloring matter in the presence of alkali with the iron which has been thus treated. substantially as hereinhet'm'e described. 1
2. 'iheproccsa of reducing indigo colorin matters by means of iron. which consirts the presence of cauetic alkali with the iron which hat. been thus treated. hllhH' intially as l'ier inheitore described.
it. The. process of reducing indiecolorinn matters by means: of iron which -on.-iists in first: pickling the iron with an a 'id and then heating the indigo color-inn matter in the. prcsei'ice of caustic alkali :olntion (\Yllit'll contains at least, 6.5 per cent..; of solid CtlttFitlt? alkali) with the iron which has been thin; treated. substantially as hereinbei'ore described.
in testimony whereof I have hcremito set my hand in the presence. of two subscribing witnesses.
. \VILHELM GAUS. \Viti'iesses J. Anni; Lnorn. ERNEST L. lives then heating: the indigo coloring matter in
US56598710A 1910-06-09 1910-06-09 Reducing indigo coloring-matters. Expired - Lifetime US1027836A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US56598710A US1027836A (en) 1910-06-09 1910-06-09 Reducing indigo coloring-matters.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US56598710A US1027836A (en) 1910-06-09 1910-06-09 Reducing indigo coloring-matters.

Publications (1)

Publication Number Publication Date
US1027836A true US1027836A (en) 1912-05-28

Family

ID=3096129

Family Applications (1)

Application Number Title Priority Date Filing Date
US56598710A Expired - Lifetime US1027836A (en) 1910-06-09 1910-06-09 Reducing indigo coloring-matters.

Country Status (1)

Country Link
US (1) US1027836A (en)

Similar Documents

Publication Publication Date Title
US1027836A (en) Reducing indigo coloring-matters.
US1667480A (en) Alkali fusion
US1010930A (en) Vat dye.
US630951A (en) Wet process of extracting silver from its haloid salts.
US835462A (en) Process of making halogenated indigo-white.
US1083246A (en) Process for desulfurizing ores.
US780886A (en) Process of purifying indigo.
GB128273A (en) Improvements in and relating to a Process for Preparing Hydrogen from Carbon or Carbon-containing Substances by the Action of Water or Water Vapour thereon.
US999055A (en) Reducing indigo coloring-matters.
US843566A (en) Process of reducing indigo coloring-matters.
SU52940A1 (en) Method for reducing the oxidant products of the violantron and methylation of the resulting product
US1124798A (en) Process of extracting potassium from flue-dust.
US1852110A (en) Method of making xanthates
SU57803A1 (en) The method of separation of ammonia and hydrogen sulfide from direct coke oven gas
US496112A (en) Constantin fahlberg
US2210396A (en) Hexacene compounds
US2344074A (en) Process for manufacturing litmus dyestuffs
GB316143A (en) Process for the manufacture of hydroxy-1. 8-naphthoylene-naphthimidazoles and sulphuric acids thereof
US679199A (en) Blue sulfur dye and process of making same.
US949592A (en) Process of making a thioindigo dye.
US1313885A (en) Process for the production of ammonia
US1497563A (en) Process of purifying sodium-sulphide solutions
US1791103A (en) Treatment of phosphate rock and alunite
US1324920A (en) Recovering valuable constituents from wood-pulp digester liquor
US938270A (en) Recovery of soda in the manufacture of alumina.