DE972273C - Process for the preparation of nitration products of toluene - Google Patents

Process for the preparation of nitration products of toluene

Info

Publication number
DE972273C
DE972273C DED5992D DED0005992D DE972273C DE 972273 C DE972273 C DE 972273C DE D5992 D DED5992 D DE D5992D DE D0005992 D DED0005992 D DE D0005992D DE 972273 C DE972273 C DE 972273C
Authority
DE
Germany
Prior art keywords
acid
trinitrotoluene
toluene
preparation
nitration products
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
DED5992D
Other languages
German (de)
Inventor
Walter Dr Meskat
Werner Dr Schultze
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.)
Dynamit Nobel AG
Original Assignee
Dynamit Nobel 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 Dynamit Nobel AG filed Critical Dynamit Nobel AG
Priority to DED5992D priority Critical patent/DE972273C/en
Application granted granted Critical
Publication of DE972273C publication Critical patent/DE972273C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C201/00—Preparation of esters of nitric or nitrous acid or of compounds containing nitro or nitroso groups bound to a carbon skeleton
    • C07C201/06—Preparation of nitro compounds
    • C07C201/16—Separation; Purification; Stabilisation; Use of additives

Landscapes

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

Description

Verfahren zur Herstellung von Nitrierungsprodukten von Toluol In dem Patent 97I 577 wird ein direktes und kontinuierliches Verfahren zur Herstellung von Nitrierungsprodukten von Toluol beschrieben, bei dem Toluol in Dampfform, gegebenenfalls in Mischung mit einem Trägergas, in ein Gemisch von Salpetersäure und Schwefelsäure eingeführt wird.Process for the preparation of nitration products of toluene By doing Patent 97I 577 becomes a direct and continuous method of manufacture of nitration products of toluene described, with the toluene in vapor form, optionally in a mixture with a carrier gas, in a mixture of nitric acid and sulfuric acid is introduced.

Will man nach dieser Arbeitsweise reines Trinitrotoluol gewinnen, so darf die Salpetersäure nicht ganz vollständig ausgenutzt werden. Wenn man diese Säure nach Gewinnung des Trinitrotoluols ohne weiteres der Denitrierung zuführt, so hat man einen Umlauf von viel Schwefelsäure und gewisse unvermeidliche Verluste an Salpetersäure in Kauf zu nehmen, was einen nicht unerheblichen Nachteil des sonst sehr wirtschaftlichen Verfahrens bedeutet. If you want to obtain pure trinitrotoluene using this procedure, so the nitric acid must not be used completely. If you have this After the trinitrotoluene has been obtained, acid is readily supplied to denitration, so there is a great deal of sulfuric acid in circulation and certain inevitable losses of nitric acid, which is a not inconsiderable disadvantage of the otherwise very economical process means.

Es wurde nun gefunden, daß eine bessere Auswertung der Säure sehr zweckmäßig in folgender Weise geschehen kann: Während sonst bei der Trinitrotoluolgewinnung der Endsäure Wasser zugefügt wird, um das Trinitrotoluol-möglichst vollständig zu gewinnen, wird hier ein erheblicher Teil der Endsäure so aufgearbeitet, daß sie nach Abtrennung des Trinitrotoluols durch Scheiden oder Auskristallisieren mit hochkonzentrierter Salpetersäure und Oleum, gegebenenfalls auch durch Einleiten von Schwefeltrioxyd oder solches enthaltenden Gasen, aufgefrischt und dem Prozeß wieder zugeführt wird. Die Qualität des gewonnenen Tnnitrotoluols leidet dadurch nicht. Es ist auch keineswegs notwendig, aus demjenigen Teil der Endsäure, der in der beschriebenen Weise in den Prozeß zurückgeht, das Trihitrotolnol vollständig herauszuholen, die darin verbliebene Menge kommt bei der Rückführung in den Prozeß zu dem neugewonnenen Produkts Derjenige Säureanteil, der nicht zurückgeführt wird, kann in der normalen Weise aufgearbeitet werden, -indem durch Verdünnen das Trinitrotoluol möglichst vollständig herausgeholt wird und die Säure in bekånnter Weise der Denitrierung und gegebenenfalls der Konzentration unterworfen wird. It has now been found that a better evaluation of the acid very much can expediently be done in the following way: While otherwise in the trinitrotoluene recovery the final acid water is added to the trinitrotoluene as completely as possible win, a considerable part of the final acid is worked up here so that she after separating off the trinitrotoluene by separating or crystallizing with highly concentrated Nitric acid and oleum, optionally also by introducing sulfur trioxide or gases containing such, is refreshed and fed back into the process. The quality of the nitrotoluene obtained does not suffer as a result. It is by no means either necessary, from that part of the final acid, which in the manner described in the The process goes back to completely extract the trihitrotolnol, the remaining in it Quantity comes to the newly won product when it is returned to the process Acid that is not returned can be worked up in the normal way - by diluting the trinitrotoluene as completely as possible and the acid in a known manner of denitration and possibly the concentration is subjected.

Claims (1)

PATENTANSPRUCH Ausbildung des Verfahrens zur Herstellung von Nitrierungsprodukten von Toluol nach Patent 97' 577, dadurch gekennzeichnet, daß bei der Herstellung von Trinitrotoluol die abgezogene Endsäurenach Entfernung derwesentlichenMengen darin gelösten Trinitrotoluols durch Zuführung von Schwefeltrioxyd bzw. Oleum und hochkonzentrierter Salpetersäure auf die für die Wiederholung des Verfahrens notwendige Säurekonzentration gebracht und dem Prozeß wieder zugeführt wird. PATENT CLAIM Development of the process for the production of nitration products of toluene according to patent 97 '577, characterized in that during manufacture of trinitrotoluene the withdrawn final acid after removal of the substantial quantities trinitrotoluene dissolved therein by adding sulfur trioxide or oleum and highly concentrated nitric acid to what is necessary for repeating the procedure Brought acid concentration and fed back to the process.
DED5992D 1942-12-30 1942-12-30 Process for the preparation of nitration products of toluene Expired DE972273C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED5992D DE972273C (en) 1942-12-30 1942-12-30 Process for the preparation of nitration products of toluene

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED5992D DE972273C (en) 1942-12-30 1942-12-30 Process for the preparation of nitration products of toluene

Publications (1)

Publication Number Publication Date
DE972273C true DE972273C (en) 1959-06-25

Family

ID=7031654

Family Applications (1)

Application Number Title Priority Date Filing Date
DED5992D Expired DE972273C (en) 1942-12-30 1942-12-30 Process for the preparation of nitration products of toluene

Country Status (1)

Country Link
DE (1) DE972273C (en)

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