DE358398C - Process for the preparation of diaminodi-p-xylylmethane from technical xylidine - Google Patents

Process for the preparation of diaminodi-p-xylylmethane from technical xylidine

Info

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
Application number
DEF47219D
Other languages
German (de)
Inventor
Dr Benno Homolka
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.)
Hoechst AG
Original Assignee
Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Priority to DEF47219D priority Critical patent/DE358398C/en
Application granted granted Critical
Publication of DE358398C publication Critical patent/DE358398C/en
Expired legal-status Critical Current

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)

PATENTANSPRUCH: Abänderung des durch Patent 27o663 geschützten Verfahrens zur Darstellung von Diaminodi-p-xylylmethan aus technischem Xylidin, darin bestehend, daß man hier nur die auf das im Gemisch der Lösungen der salzsauren Salze der Diaminodixylylmetharie vorhandene p-Xylidinberechnete Menge Formaldehyd zur Anwendung bringt.PATENT CLAIM: Modification of the process protected by patent 27o663 for the preparation of diaminodi-p-xylylmethane from technical xylidine, consisting of that we only refer to the mixture of solutions of the hydrochloric acid salts of the diaminodixylyl metharie uses p-xylidine present calculated amount of formaldehyde.
DEF47219D 1920-07-04 1920-07-04 Process for the preparation of diaminodi-p-xylylmethane from technical xylidine Expired DE358398C (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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