DE353221C - Process for the preparation of a green pigment - Google Patents

Process for the preparation of a green pigment

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Publication number
DE353221C
DE353221C DE1917353221D DE353221DD DE353221C DE 353221 C DE353221 C DE 353221C DE 1917353221 D DE1917353221 D DE 1917353221D DE 353221D D DE353221D D DE 353221DD DE 353221 C DE353221 C DE 353221C
Authority
DE
Germany
Prior art keywords
preparation
green pigment
green
patent specification
naphthoquinone
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
DE1917353221D
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German (de)
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
Application granted granted Critical
Publication of DE353221C publication Critical patent/DE353221C/en
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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
    • C09B65/00—Compositions containing mordants

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

Description

Verfahren zur Darstellung eines grünen Pigmentfarbstoffes. In der Patentschrift 350738 ist ein Verfahren zur Darstellung eines gelben kristallinischen Kondensationsproduktes aus a-Naphthochinon beschrieben, welches darin besteht, daß letzteres in Gegenwart von Wasser erhitzt wird. Es. wurde nun. gefunden, daß dieses Kondensationsprodukt durch saure oder neutrale Reduktionsmittel in ein grünes Reduktionsprodukt übergeführt wird.. Da -das bei der Darstellung des Ausgangsmaterials gleichzeitig entstehende Naphthohyd'rochinon bei höherer Temperaturselbst als Reduktionsmittel wirkt, kann man den grünen Körper auch in einer Operation aus a-Naphthochinon erhalten, wenn man ge- nügend hoch und genügend lange, z. B. einige Stunden auf etwa 15o°, erhitzt. Das erhaltene Produkt ist infolge seiner Unlöslichkeit in Wasser und .den Üblichen organischen Lösungsmitteln und seiner außergewöhnlichen Lichtechtheit zur Herstellung von Körperfarben hervorragend geeignet. Beispiel r.Process for the preparation of a green pigment. Patent specification 350738 describes a process for the preparation of a yellow crystalline condensation product from α-naphthoquinone, which consists in heating the latter in the presence of water. It. became now. found that this condensation product is converted into a green reduction product by acidic or neutral reducing agents .. Since the naphthohydroquinone which is produced at the same time as the starting material acts as a reducing agent at a higher temperature, the green body can also be used in an operation from a- naphthoquinone obtained when g e - cient high and long enough, for. B. heated to about 150 ° for a few hours. Due to its insolubility in water and the usual organic solvents and its exceptional lightfastness, the product obtained is eminently suitable for the production of body colors. Example r.

Ein Gewichtsteil des. gemäß Patentschrift 350738 erhältlichen, gelben Kondensationsproduktes- aus a-Naphthochinon wird in io Teilen konzentrierter Schwefelsäure gelöst und,die Lösung unter Rühren und Eiskühlung allmählich mit 2 Teilen Zinkstaub versetzt. Man läßt noch einige Zeit rühren und gießt auf Eiswasser. Das in grünen Flocken ausfallende Produkt wird abgesaugt, mit Wasser ausgewaschen und zur Paste .angerührt oder getrocknet. Es ist in Waisser, verdünnten Säuren und Alkalien, sowie in niedrig siedenden Lösungsmitteln unlöslich, in konzentrierter Schwefelsäure mit bräunlicher Farbe löslich. Aus hochsiedenden Lösungsmitteln; z. B. aus siedendem Nitrobenzol, kristallisiert es bei raschem Erkalten in verfilzten, grünen Nadeln, bei langsamem Erkalten in stahlblauen, körnigen Kriställchen, die über 300° ohne zu schmelzen sich allmählich zersetzen. Durch Oxydation mit Salpetersäure wird es in das gelbe zurückverwandelt. Beispiel 2.One part by weight of the yellow obtainable according to patent specification 350738 Condensation product from α-naphthoquinone is concentrated in 10 parts of concentrated sulfuric acid dissolved and gradually add 2 parts of zinc dust to the solution while stirring and cooling with ice offset. The mixture is left to stir for a while and poured onto ice water. That in green The product which precipitates out flakes is suctioned off, washed out with water and turned into a paste . stirred or dried. It's in Waisser, dilute acids and alkalis, as well Insoluble in low-boiling solvents, in concentrated sulfuric acid with brownish color soluble. From high-boiling solvents; z. B. from boiling Nitrobenzene, when it cools down quickly, it crystallizes in matted, green needles, on slow cooling in steel-blue, granular crystals, which over 300 ° without to melt gradually decompose. It becomes through oxidation with nitric acid turned back to the yellow. Example 2.

q. Teile a-Naphthodhinon werden: mit 5 Teilen Wasser etwa 4. Stunden lang im Rührautoklaven auf i5o° erhitzt. Nach idem Erkalten wird das schwarzgrüne Rohprodukt zerkleinert, durch Auskochen mit verdünnter Natronlauge von Naphthohydrochinon und anderen alkalilöslichen Nebenprodukten befreit und z. B. durch Umkristallisation aus siedendem Nitrobenzol gereinigt. Es ist mit dem in Beispiel i beschriebenen Produkt identisch.q. Parts of a-naphthodhinone become: with 5 parts of water about 4 hours heated to 150 ° in a stirred autoclave for a long time. After the same cooling, the black-green one Crude product crushed by boiling with dilute sodium hydroxide solution of naphthohydroquinone and other alkali-soluble by-products and z. B. by recrystallization purified from boiling nitrobenzene. It is similar to that described in example i Identical product.

Claims (2)

PATENTANSPRÜCHE: i. Verfahren zur Darstellung eines grünen Pigmentfarbstoffes, dadurch gekennzeichnet, @daß: da:s nach dem Verfahren der Patentschrift 350738 aus a-Naphthochinon erhältliche Kondensationsprodukt mit sauren oder neutralen Reduktionsmitteln behandelt wird. PATENT CLAIMS: i. Process for the preparation of a green pigment dye, characterized in that @ that: da: s according to the method of patent specification 350738 a-naphthoquinone available condensation product treated with acidic or neutral reducing agents will. 2. Ausführungsform des Verfahrens nach Anspruch i, gekennzeichnet durch die Verwendung des bei der Herstellung des gelben Kandensationspraduktes gemäß Patentschrift 350738 gleichzeitig entstehenden a-Naphthohyidrochinons als Reduldionsmittel.2. Embodiment of the method according to claim i, characterized by the Use of the in the production of the yellow Kandensationspraduktes according to patent specification 350738 a-naphthohyidroquinone produced at the same time as a redulant.
DE1917353221D 1917-04-29 1917-04-29 Process for the preparation of a green pigment Expired DE353221C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE353221T 1917-04-29

Publications (1)

Publication Number Publication Date
DE353221C true DE353221C (en) 1922-05-16

Family

ID=6280536

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1917353221D Expired DE353221C (en) 1917-04-29 1917-04-29 Process for the preparation of a green pigment

Country Status (1)

Country Link
DE (1) DE353221C (en)

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