[특허]Process for the production of dinitrotoluene

[미국특허] Process for the production of dinitrotoluene 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C07C-205/00
출원번호	US-0827502 (2007-07-12)
등록번호	US-7495136 (2009-02-24)
우선권정보	DE-10 2006 033 722(2006-07-21)
발명자 / 주소	Pohl,Fritz Lorenz,Wolfgang Muennig,Juergen Pennemann,Bernd Wiechers,Gerhard
출원인 / 주소	Bayer MaterialScience AG
대리인 / 주소	Whalen,Lyndanne M.
인용정보	피인용 횟수 : 2 인용 특허 : 22

초록 ▼

Dinitrotoluene is produced by nitration of toluene with nitrating acid (mixture of nitric acid and sulfuric acid) in which, in a first stage, the toluene is converted to mononitrotoluene (MNT) and then the mononitrotoluene is converted in a second stage to dinitrotoluene (DNT). Control of the weight ratio of the aqueous to organic phases, dispersion of the organic phase in the aqueous phase and use of less than 2.06 moles of nitric acid per mole of toluene are key features of this process.

대표청구항 ▼

What is claimed is: 1. A process for the production of dinitrotoluene by the nitration of toluene with nitrating acid comprising: a) reacting an organic phase comprising toluene with an aqueous phase comprising nitrating acid to form a reaction mixture containing mononitrotoluene, b) separating the reaction mixture containing mononitrotoluene into an organic phase containing mononitrotoluene and an aqueous phase containing sulfuric acid, c) reacting the organic phase containing mononitrotoluene with nitrating acid to form a reaction mixture containing dinitrotoluene, and d) separating the reaction mixture containing dinitrotoluene into an organic phase containing dinitrotoluene and an aqueous phase containing sulfuric acid in which 1) a weight ratio of the aqueous phase to the organic phase in step a) is >2:1, 2) a weight ratio of the aqueous phase to the organic phase in step c) >1.5:1, 3) the organic phase is dispersed in the aqueous phase in step a), 4) the organic phase is dispersed in the aqueous phase in step c), and 5) less than 2.06 moles of nitric acid are used per mole of toluene. 2. The process of claim 1 in which a portion of the aqueous phase containing sulfuric acid obtained in step d) is recycled to step c) to establish a weight ratio of the aqueous phase containing sulfuric acid to the organic phase containing dinitrotoluene of >1.5 in step d). 3. The process of claim 2 in which at least a portion of the aqueous phase containing sulfuric acid obtained in step d) is recycled to a first reactor in a cascade of up to 4 reactors. 4. The process of claim 1 in which the aqueous phase containing sulfuric acid obtained in step d) is recycled completely or partly to step a). 5. The process of claim 1 in which the aqueous phase containing sulfuric acid obtained in step b) is fed completely or partly to step c). 6. The process of claim 1 in which the reaction in step a) and/or step c) is carried out isothermally. 7. The process of claim 1 in which a static separator is used for the phase separation in step b) and/or step d). 8. The process of claim 1 in which step a) and/or step c) is carried out in a cascade of up to 4 reactors. 9. The process of claim 8 in which the last reactor in step c) is a tube reactor. 10. The process of claim 1 in which step a) and/or step c) takes place in a loop reactor. 11. The process of claim 1 in which ≦1.03 moles of nitric acid are used per mole of toluene in step a). 12. The process of claim 1 in which ≦1.03 moles of nitric acid are used per mole of mononitrotoluene in step c).

이 특허에 인용된 특허 (22) 인용/피인용 타임라인 분석

Klingler, Uwe; Pirkl, Hans-Georg; Schieb, Thomas; Wastian, Dietmar, Adiabatic process for producing dinitrotoluene.
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Sawicki John E. (Breinigsville PA), High purity 2,4-dinitrotoluene from toluene nitration process.
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Carr Richard V. C. (Allentown PA), Nitric acid recovery by the adiabatic nitration of nitroaromatics with fortified spent acid.
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Cook Newell C. (Schenectady NY) Davis Gary C. (Albany NY), Process for making dinitrotoluene.
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Schubert ; Hans ; Wunder ; Friedrich, Process for nitrating toluene.
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Mazzafro William J. (Schnecksville PA) Clarke Stephen I. (Macungie PA) Taylor Philip N. (Bethlehem PA), Process for purification and concentration of sulfuric acid.
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Carr Richard V. C. (Allentown PA) Toseland Bernard A. (Allentown PA) Ross David S. (Palo Alto CA), Process for separating nitroaromatic compounds from spent nitric acid.
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Witt Harro (Kuden DEX) Beckhaus Heiko (Leverkusen DEX), Process for separating sulphuric acid and nitric acid from dinitrotoluene mixtures obtained during the nitration of tolu.
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Pirkl Hans-Georg (Koln DEX) Schomacker Reinhard (Leverkusen DEX) Klingler Uwe (Dormagen DEX) Schieb Thomas (Rosrath DEX) Wiechers Gerhard (Leverkusen DEX) Zimmermann Jurgen (Walnut Creek CA), Process for the polynitration of aromatic compounds.
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Schieb Thomas (Rsrath DEX) Wiechers Gerhard (Leverkusen DEX) Sundermann Rudolf (Leverkusen DEX) Zarnack Uwe (Brunsbttel DEX), Process for the preparation of dinitrotoluene.
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Gerken Rudolf (Krefeld DEX) Lailach Gnter (Krefeld DEX) Becher Dieter (Dormagen DEX) Witt Harro (Kuden DEX), Process for the production of dinitrotoluene.
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Klingler Uwe (Dormagen DEX) Schieb Thomas (Rorath DEX) Wiechers Gerhard (Leverkusen DEX) Zimmermann Jurgen (Walnut Creek CA), Process for the production of dinitrotoluene.
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Klingler Uwe (Dormagen DEX) Schieb Thomas (Rosrath DEX) Wiechers Gerhard (Leverkusen DEX) Zimmermann Jurgen (Walnut Creek CA), Process for the production of dinitrotoluene.
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Klingler Uwe,DEX ; Schieb Thomas,DEX ; Wastian Dietmar,DEX ; Wiechers Gerhard,DEX ; Zimmerman Jurgen, Process for the production of dinitrotoluene.
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Mason Robert W. (Lake Charles LA), Process for the production of dinitrotoluene.
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Muennig,Juergen; Pennemann,Bernd; Wastian,Dietmar; Michele,Volker; Caravaggio,Jesse; Gisch, Jr.,John F., Process for the production of dinitrotoluene.
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Mason Robert W. (Lake Charles LA) Imm Peter C. (Sulphur LA) Bordelon Kent J. (Lake Charles LA), Process for the production of dinitrotoluene using an inorganic salt as a phase separation agent.
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Dieterich,Erwin; Hielscher,Anke; Keggenhoff,Berthold; Keller Killewald,Manfred; M체nnig,J체rgen; Wastian,Dietmar, Process for the two-step production of dinitrotoluene.
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M?nnig, J?rgen; Wastian, Dietmar; Lorenz, Wolfgang; Keggenhoff, Berthold, Process for working up the waste water obtained in the preparation of dinitrotoluene.
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Hermann Heinrich,DEX ; Gebauer Jurgen,DEX, Recovery of nitric acid from nitration processes.
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Zhang Chunjie ; Pennington Buford T. ; Baird Jeffrey W. ; Quakenbush Allen B. ; Goldstein Stephen L. ; Lickei Donald L. ; Whitman Peter J., Two-stage dinitrotoluene production process.
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Mazzafro William Joseph ; Clarke Stephen Ian ; Simpson Mark Shedric ; Carr Richard Van Court, Weak acid process for producing dinitrotoluene.
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이 특허를 인용한 특허 (2) 인용/피인용 타임라인 분석

Marion, Philippe, Method for preparing dinitrotoluene.
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Berretta, Sergio; Boyd, David A., Method for reducing the formation of by-product dinitrobenzene in the production of mononitrobenzene.
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[미국특허] Process for the production of dinitrotoluene 원문보기