CH87885A - Process for the preparation of o-hydrazotoluene in solid form. - Google Patents
Process for the preparation of o-hydrazotoluene in solid form.Info
- Publication number
- CH87885A CH87885A CH87885DA CH87885A CH 87885 A CH87885 A CH 87885A CH 87885D A CH87885D A CH 87885DA CH 87885 A CH87885 A CH 87885A
- Authority
- CH
- Switzerland
- Prior art keywords
- sep
- cathode
- hydrazotoluene
- preparation
- marked
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/20—Processes
- C25B3/25—Reduction
Description
Verfahren zur Darstellung son o-Hydrazotoluol in fester Torau. Gegenstand vorliegender Erfindung ist ein Verfahren zur Darstellung von o-Hydrazoto- hiol in fester Form durch elektrolytische Reduktion von o-Niti-otol(iol, o-ilzoox@ltoluol oder o-Azotoluol bei Gegenwart von Alkali lauge und eines reduzierenden 11letalles,
dessen <B>Oxyd</B> in Alkali löslich ist. Der sich während der Elektrolyse aal der Kathode bildende feste Überzug aus o-Hydrazotoluol und o-Azo- toluol wird mechanisch von derselben ent fernt, so dalj der Stromdui,cligaiig während des Reduktionsprozesses nie eine allzugrol>e Erschwerung erleiden kann.
Hierbei kann für die Kathode eines der bereits vielfach vorgeschlagenen Metalle, wie Nickel, Eisen oder Blei, verwendet werden. Als besonders hierzu geeignet hat sich jedoch (las Nickel erwiesen, besonders wenn als reduzierendes Metall Blei zier Verwendung gelangen soll. In dieseln Falle lässt sieh das auf der Kathode sich bildende, bei 80 bis 100 C feste Gemisch von Azo- und Hydrazoto- luol glatt von der Nickelelektrode abstreichen.
<I>Beispiel:</I> 20 bi, o-Azotoluol, in<B>150</B> ccni Natronlauge voll 12 Bö s(ispendiert, werden finit 2 gr Bleioxyd bei 80 bis<B>100</B> C mit einer Stroin- dichte von 11)
Amperes per Quadratdecimeter aal einer Nickelkathüde elektrolysiert. Auf der Niclzelkatliode bildet sieh bald eine Schicht von o-fIvdrazotol(iol lind o-Azotoluol mit Bleischwamm gemischt, die mechanisch leicht voll der Elektrode zu entfernen ist,
aber zur vollständigen Reduktion in der Tauge be lassen wird. Das fertige Produkt kann zur Entfernung des Bleischwammes noch einige Zeit ohne Strom mit etwas o-Azotoluol ver rührt werden. Das erhaltene o-Hydrazotoluol wird abfiltrieit.
Das mechanische Entfernen des Reduk- tionsproduktes von der Kathode kann perio disch oder kontinuierlich stattfinden, sei es durch Betiitigung eines Abstreichers, durch @lregschweminen oder mittelst eines andern mechanischen Verfahrens.
-,In Stelle von o-ilzotoluol kann im angege benen Beispiel mit gleichem Eifolge o-Nitroto- luol oder o-Azooiytoluol verwendet werden, da in beiden letzteren Rillen sich stet interniediür o-Azotoluol bildet.
Process for the preparation of son o-hydrazotoluene in solid Torau. The present invention relates to a process for the preparation of o-hydrazotoluene in solid form by electrolytic reduction of o-Niti-otol (iol, o-ilzoox @ ltoluene or o-azotoluene in the presence of alkali and a reducing metal,
whose <B> oxide </B> is soluble in alkali. The solid coating of o-hydrazotoluene and o-azotoluene that forms on the cathode during the electrolysis is removed mechanically from the cathode, so that the current can never suffer too much difficulty during the reduction process.
One of the metals that have already been proposed many times, such as nickel, iron or lead, can be used for the cathode. Nickel has proven to be particularly suitable for this purpose, especially when lead is to be used as a reducing metal. In this case, the mixture of azo- and hydrazotoluene that forms on the cathode and which is solid at 80 to 100 ° C. leaves smooth wipe off the nickel electrode.
<I> Example: </I> 20 bi, o-azotoluene, in <B> 150 </B> ccni sodium hydroxide solution full of 12 gusts (is suspended, finite 2 g lead oxide at 80 to <B> 100 </B> C with a stroke density of 11)
Amperes per square decimeter electrolyzed by a nickel cathode. A layer of o-fIvdrazotol (iol and o-azotoluene mixed with lead sponge, which can easily be removed mechanically from the electrode, soon forms on the
but is left in the suit for complete reduction. The finished product can be stirred with a little o-azotoluene for some time without electricity to remove the lead sponge. The o-hydrazotoluene obtained is filtered off.
The mechanical removal of the reduction product from the cathode can take place periodically or continuously, be it by the operation of a scraper, by oil pigs, or by some other mechanical process.
In the example given, o-nitrotoluene or o-azotoluene can be used in place of o-ilzotoluene with the same sequence, since internal o-azotoluene is constantly formed in the latter two grooves.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH87885T | 1919-07-22 | ||
CH85228T | 1919-07-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH87885A true CH87885A (en) | 1921-01-03 |
Family
ID=25703446
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH87885D CH87885A (en) | 1919-07-22 | 1919-07-22 | Process for the preparation of o-hydrazotoluene in solid form. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH87885A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2458541A1 (en) * | 1979-06-05 | 1981-01-02 | Borma Bv | PROCESS AND APPARATUS FOR PREPARING HYDRAZO-AROMATIC COMPOUNDS OR DIAMINODIPHENYLIC COMPOUNDS |
-
1919
- 1919-07-22 CH CH87885D patent/CH87885A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2458541A1 (en) * | 1979-06-05 | 1981-01-02 | Borma Bv | PROCESS AND APPARATUS FOR PREPARING HYDRAZO-AROMATIC COMPOUNDS OR DIAMINODIPHENYLIC COMPOUNDS |
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