DE729782C - Process for the recovery of high quality gelatin from waste photographic material - Google Patents

Process for the recovery of high quality gelatin from waste photographic material

Info

Publication number
DE729782C
DE729782C DED86007D DED0086007D DE729782C DE 729782 C DE729782 C DE 729782C DE D86007 D DED86007 D DE D86007D DE D0086007 D DED0086007 D DE D0086007D DE 729782 C DE729782 C DE 729782C
Authority
DE
Germany
Prior art keywords
gelatin
high quality
recovery
photographic material
silver
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
DED86007D
Other languages
German (de)
Inventor
Dr Friedrich Siegmann
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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 Degussa GmbH filed Critical Degussa GmbH
Priority to DED86007D priority Critical patent/DE729782C/en
Application granted granted Critical
Publication of DE729782C publication Critical patent/DE729782C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C11/00—Auxiliary processes in photography
    • G03C11/24—Removing emulsion from waste photographic material; Recovery of photosensitive or other substances

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Verfahren zur Wiedergewinnung hochwertiger Gelatine aus Abfällen von Photomaterial Bei der Aufarbeitung des Silbers aus Photoabfällen, wie Filme, Photopapier u. dgl., wurde bisher meist so gearbeitet, daß die das Silber bzw. dessen Verbindungen enthaltende Gelatineschicht von der Unterlage, beispielsweise Nitro- oder Acetylcellulose, vermittels cyankalischer Lösungen abgelöst wird. Die Nitro- bzw. Acetylcellulos-e kann auf Klebmittel u. dgl. weiterverarbeitet werden, während die cyankalische Silb:ergelatinelösumg zunächst eingedickt wird. Auf diese Weise wird das Silber gewonnen, während die Gelatine verbrennt.Process for the recovery of high quality gelatin from waste of Photographic material When processing silver from photographic waste, such as films, photographic paper and the like, has hitherto been worked mostly in such a way that the silver or its compounds containing gelatin layer from the base, for example nitro or acetyl cellulose, is replaced by means of cyankali solutions. The nitro or acetyl cellulose e can be further processed on adhesives and the like, while the cyancal syllable: ergelatinelösumg is initially thickened. In this way the silver is extracted while the Gelatin burns.

Es ist auch schon bekannt, bei der Wiedergewinnung des Silbers aus Silber oder Silberverbindungen enthaltenden Abfällen von photographischem Material die Gelatine durch Auswaschen und Trocknen wiederzugewinnen. Dabei wurde jedoch nur ein absolut unreines, für wenige Zwecke brauchbares Produkterhalten.It is also already known in the recovery of the silver from it Waste photographic material containing silver or silver compounds recover the gelatin by washing and drying. It was, however only an absolutely impure product that can be used for a few purposes is obtained.

Erfindungsgemäß kann nun bessere Gelatine neben dem Silber gewonnen werden, wenn die cyankalische Lösung einer Elektrodialyse unterworfen wird. Die gewonnene: Gelatine ist außerordentlich rein und kann beispielsweise zu einem hochwertigen transparenten Leim weiterverarbeitet werden.According to the invention, better gelatin can now be obtained in addition to the silver when the cyanogenic solution is subjected to electrodialysis. the Obtained: Gelatin is extremely pure and can, for example, become a high quality transparent glue can be further processed.

Es ist an sich bekannt, bei der Herstellung von Leim die Gelatine enthaltende Flüssigkeit einer Dialyse zu unterwerfen, wobei jedoch diese Dialyse :ein außerordentlich kompliziertes und mehrstufiges Verfahren darstellt, um die Gelatine möglichst rein zu erhalten. Es wird zu diesem Zweck b,eispielsweise in einem q.kammerigen Elektrodialysator vordialysiert und in einem zweiten Arbeitsgang die eigentliche Trennung von dem Protein oder dem Eiweißprodukt vorgenommen.It is known per se to use gelatine in the production of glue containing liquid to be subjected to dialysis, but this dialysis : is an extremely complicated and multi-step process to get the To keep gelatine as pure as possible. For this purpose it is b, for example in pre-dialyzed in a q-chamber electrodialyzer and in a second operation the actual separation of the protein or protein product is made.

Bei dem vorliegenden Verfahren, bei dem das Silber und die Gelatine vermittels cyankalscher Lösung von der Unterlage getrennt werden, können erfindungsgemäß schon in einem 3zelligen Elektrodialysator in einem ArIeitsgang sämtliche Substanzen mit Aus- leimsubstanzen, als dies bei der bisherigieif;" Leimherstellung der Fall war, trotzdem die restlose Entfernung aller störenden Substanzen praktisch in derselben Zeit durch das einstufige Verfahren vorgenommen werden kann.In the present method, in which the silver and the gelatin are separated from the substrate by means of a cyankal solution, all substances with output can, according to the invention, be in a 3-cell electrodialyzer in one operation. glue substances than was the case with the previous glue production, although the complete removal of all interfering substances can be carried out practically in the same time using the one-step process.

Es wird auf diese Weise eine in trockenem Zustand klare Gelatine erhalten, die nur eine schwach gelbliche Färbung aufweist, und sich zwar für Photozwecke nicht mehr eignet, jedoch noch einen außerordentlich hochwertigen Leim liefert. Beispiel Nach dein Ablösen der Gelatinesilberschicht vom Filmband durch eine verdünnte Cyanidlösung in Gegenwart von Luft wird die -erhaltene Lösung in den Mittelraum eines 3zelligen Elektrodialysators gebracht. Mit steigender Spannung yon etwa 6 bis i t o Volt wird einige Stunden dialysiert. Beim bennten raschen Ansteigen der Spannung wird gje Dialyse unterbrochen. Man erhält eine anorganischen Salzen vollständig befreite 0are Leimlösung von schwach gelber Farbe. Die Lösung wird im Vakuum eingedampft oder im Zerstäubungstrockner getrocknet. Man erhält ein helles dünnblättriges bzw. pulvriges Material, das einen ausgezeichneten hochwertigen Leim darstellt.In this way a gelatin that is clear when dry is obtained, which is only slightly yellow in color, and is not suitable for photographic purposes more suitable, but still delivers an extraordinarily high-quality glue. example After removing the gelatin silver layer from the film tape with a dilute cyanide solution In the presence of air, the solution obtained is in the middle of a 3-cell Electrodialyzer brought. With increasing voltage from about 6 to i t becomes o volts dialyzed for a few hours. When the voltage rises rapidly, gje Dialysis interrupted. Completely freed inorganic salts are obtained 0are glue solution of pale yellow color. The solution is evaporated in vacuo or dried in a spray dryer. A light, thin-leaved resp. powdery material that makes an excellent high quality glue.

Claims (2)

PATENTANSPRÜCHE: i. Verfahren zur Verbesserung der Gelatine, die aus Abfällen von Photomaterial .durch Behandlung mit Alkalicyanid gewonnen worden ist, dadurch gekennzeichnet, daß die die Gelatine enthaltende Flüssigkeit einer einstufigen Elektrodialyse unterworfen wird. PATENT CLAIMS: i. Process for improving the gelatin made from Waste of photographic material. Obtained by treatment with alkali cyanide, characterized in that the liquid containing the gelatin is a one-stage Electrodialysis is subjected. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß die Elektrodialyse in einer 3kammerigen Zelle vorgenommen wird.2. The method according to claim i, characterized in that that the electrodialysis is carried out in a 3-chamber cell.
DED86007D 1941-09-26 1941-09-27 Process for the recovery of high quality gelatin from waste photographic material Expired DE729782C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED86007D DE729782C (en) 1941-09-26 1941-09-27 Process for the recovery of high quality gelatin from waste photographic material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DED0086007 1941-09-26
DED86007D DE729782C (en) 1941-09-26 1941-09-27 Process for the recovery of high quality gelatin from waste photographic material

Publications (1)

Publication Number Publication Date
DE729782C true DE729782C (en) 1942-12-23

Family

ID=25972806

Family Applications (1)

Application Number Title Priority Date Filing Date
DED86007D Expired DE729782C (en) 1941-09-26 1941-09-27 Process for the recovery of high quality gelatin from waste photographic material

Country Status (1)

Country Link
DE (1) DE729782C (en)

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