DE358398C - Process for the preparation of diaminodi-p-xylylmethane from technical xylidine - Google Patents
Process for the preparation of diaminodi-p-xylylmethane from technical xylidineInfo
- Publication number
- DE358398C DE358398C DEF47219D DEF0047219D DE358398C DE 358398 C DE358398 C DE 358398C DE F47219 D DEF47219 D DE F47219D DE F0047219 D DEF0047219 D DE F0047219D DE 358398 C DE358398 C DE 358398C
- Authority
- DE
- Germany
- Prior art keywords
- xylidine
- technical
- xylylmethane
- diaminodi
- preparation
- 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
Links
Description
Verfahren zur Darstellung von Diaminodi-p-xylylmethan aus technischem Xylidin. Durch Patent 27o663 ist ein Verfahren zur Darstellung von Diaminodi-p-xylylmethan aus technischem Xylidin geschützt, welches darin besteht, daß man aus der salzsauren Lösung der bei der Xylidintrennung nach dem Verfahren des Patentes 27o663 erhältlichen nichtflüchtigen Methanbasen durch doppelte Umsetzung mit Alkalisulfaten das Diaminodip-xylylmethan in Form des unlöslichen Sulfats abscheidet.Process for the preparation of diaminodi-p-xylylmethane from technical xylidine. By patent 27o663 is a process for the preparation of diaminodi-p-xylylmethane Protected from technical xylidine, which consists in separating the diaminodip-xylylmethane in the form of the insoluble sulfate from the hydrochloric acid solution of the non-volatile methane bases obtainable in the xylidine separation by the process of patent 27o663 by double reaction with alkali sulfates.
Es wurde nun eine Neuerung dieses Verfahrens gefunden, welche darin besteht, daß man nicht die Gesamtmenge der im technischen Xylidin enthaltenen, mit Formaldehyd zu Methanbasen kondensierbaren Basen an Formaldehyd bindet, sondern daß man nur so viel Formaldehyd verwendet, als dem vorhandenen p-Xylidin entspricht. Diese Neuerung bedeutet eine Ersparnis von ungefähr 6o bis 66 Prozent an Formaldehyd gegenüber der bei dem Verfahren des Hauptpatents benötigten Menge.A novelty of this process has now been found, which is it is that you do not have the total amount of contained in technical xylidine, with Formaldehyde binds to formaldehyde bases condensable to methane bases, rather that you only use as much formaldehyde as corresponds to the p-xylidine present. This innovation means a saving of about 60 to 66 percent of formaldehyde compared to the amount required in the process of the main patent.
Beispiel: 725 kg tecluiischen Xylidins, dessen Gehalt an p-Xylidin zu r r Prozent ermittelt wurde, werden mit 6oo kg Salzsäure von 22° Be in etwa 30001 Wasser gelöst, worauf man 25 kg Formaldehyd von 40 Prozent hinzufügt und etwa eine Stunde zum Sieden erhitzt. Nach dem Erkalten wird das Reaktionsprodukt mit Alkali abgeschieden, mit Wasserdampf destilliert und weiter genau nach dem Verfahren .des Hauptpatents verarbeitet.Example: 725 kg of technical xylidine, the content of which is p-xylidine r r percent was determined, with 600 kg of hydrochloric acid of 22 ° Be in about 30001 Dissolved water, whereupon 25 kg of formaldehyde of 40 percent are added and about one Heated to the boil for an hour. After cooling, the reaction product becomes with alkali deposited, distilled with steam and further exactly according to the procedure .des Main patent processed.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF47219D DE358398C (en) | 1920-07-04 | 1920-07-04 | Process for the preparation of diaminodi-p-xylylmethane from technical xylidine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF47219D DE358398C (en) | 1920-07-04 | 1920-07-04 | Process for the preparation of diaminodi-p-xylylmethane from technical xylidine |
Publications (1)
Publication Number | Publication Date |
---|---|
DE358398C true DE358398C (en) | 1922-09-11 |
Family
ID=7101501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEF47219D Expired DE358398C (en) | 1920-07-04 | 1920-07-04 | Process for the preparation of diaminodi-p-xylylmethane from technical xylidine |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE358398C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2938054A (en) * | 1958-02-18 | 1960-05-24 | Allied Chem | Process for purification of 4, 4'-methylenedianiline |
-
1920
- 1920-07-04 DE DEF47219D patent/DE358398C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2938054A (en) * | 1958-02-18 | 1960-05-24 | Allied Chem | Process for purification of 4, 4'-methylenedianiline |
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