Abrégé

In a first aspect, the invention relates to a hydrogenation process for the hydrogenation of a compound comprising reacting the compound in a liquid medium with hydrogen in the presence of a heterogeneous hydrogenation catalyst in a reaction vessel, the process comprising: (i) transferring at least a part of the thermal energy generated in the reaction vessel to a cooling medium, preferably a cooling medium stream CMS1, obtaining a cooling medium stream CMS2, which has an increased thermal energy content compared to CMS1; and (ii) transferring at least a part of the thermal energy comprised in cooling medium stream CMS2 to a heat transfer medium stream HTMS1 in a heat pump HP, thereby obtaining a heat transfer medium stream HTMS2, which has an increased thermal energy content compared to HTMS1. In a first aspect, the invention relates to a hydrogenation process for the hydrogenation of a compound comprising reacting the compound in a liquid medium with hydrogen in the presence of a heterogeneous hydrogenation catalyst in a reaction vessel, the process comprising: (i) transferring at least a part of the thermal energy generated in the reaction vessel to a cooling medium, preferably a cooling medium stream CMS1, obtaining a cooling medium stream CMS2, which has an increased thermal energy content compared to CMS1; and (ii) transferring at least a part of the thermal energy comprised in cooling medium stream CMS2 to a heat transfer medium stream HTMS1 in a heat pump HP, thereby obtaining a heat transfer medium stream HTMS2, which has an increased thermal energy content compared to HTMS1. A second aspect of the invention is directed to a reaction system for hydrogenation of a compound, preferably for converting a compound having at least one nitro group into the corresponding compound having at least one amino group by hydrogenation.

Classes IPC  ?

• C07C 209/36 - Préparation de composés contenant des groupes amino liés à un squelette carboné par réduction de liaisons azote-oxygène ou azote-azote par réduction de groupes nitro par réduction de groupes nitro liés à des atomes de carbone de cycles aromatiques à six chaînons
• B01J 8/18 - Procédés chimiques ou physiques en général, conduits en présence de fluides et de particules solidesAppareillage pour de tels procédés les particules étant fluidisées
• B01J 8/22 - Procédés chimiques ou physiques en général, conduits en présence de fluides et de particules solidesAppareillage pour de tels procédés les particules étant fluidisées l'agent fluidisant étant un liquide du gaz étant introduit dans le liquide

Abrégé

A first aspect of the invention relates to a purification process for obtaining vicinal toluenediamine. In a second aspect, the invention is directed to vicinal TDA (vTDA) obtained or obtainable from a process of the first aspect of the invention, comprising less than 100 weight-ppm of a toluidine compound of formula (I). A third aspect of the invention is related to vicinal TDA (vTDA) having a purity in the range of at least 99 weight- % and comprising less than 100 weight-ppm of a toluidine compound of formula (I).

Classes IPC  ?

• C07C 209/84 - Purification
• C07C 211/50 - Composés contenant des groupes amino liés à un squelette carboné ayant des groupes amino liés à des atomes de carbone de cycles aromatiques à six chaînons du squelette carboné ayant des groupes amino liés à un seul cycle aromatique à six chaînons ayant au moins deux groupes amino liés au squelette carboné avec au moins deux groupes amino liés à des atomes de carbone de cycles aromatiques à six chaînons du squelette carboné

Abrégé

In a first aspect, the invention relates to a hydrogenation process for the hydrogenation of a compound comprising reacting the compound in a liquid medium with hydrogen in the presence of a heterogeneous hydrogenation catalyst in a reaction vessel, the process comprising: (i) transferring at least a part of the thermal energy generated in the reaction vessel to a cooling medium, preferably a cooling medium stream CMS1, obtaining a cooling medium stream CMS2, which has an increased thermal energy content compared to CMS1; and (ii) transferring at least a part of the thermal energy comprised in cooling medium stream CMS2 to a heat transfer medium stream HTMS1 in a heat pump HP, thereby obtaining a heat transfer medium stream HTMS2, which has an increased thermal energy content compared to HTMS1. A second aspect of the invention is directed to a reaction system for hydrogenation of a compound, preferably for converting a compound having at least one nitro group into the corresponding compound having at least one amino group by hydrogenation.

Classes IPC  ?

• C07C 209/36 - Préparation de composés contenant des groupes amino liés à un squelette carboné par réduction de liaisons azote-oxygène ou azote-azote par réduction de groupes nitro par réduction de groupes nitro liés à des atomes de carbone de cycles aromatiques à six chaînons
• C07C 211/50 - Composés contenant des groupes amino liés à un squelette carboné ayant des groupes amino liés à des atomes de carbone de cycles aromatiques à six chaînons du squelette carboné ayant des groupes amino liés à un seul cycle aromatique à six chaînons ayant au moins deux groupes amino liés au squelette carboné avec au moins deux groupes amino liés à des atomes de carbone de cycles aromatiques à six chaînons du squelette carboné
• C07B 31/00 - Réduction, en général

Abrégé

Proposed is a separation method in a toluene to dinitrotoluene process, wherein said method with a first process step comprising feeding a toluene comprising first stream (1) and a nitric acid comprising second stream (2) into a first reactor (R1), reacting of the toluene comprising first stream (1) and the nitric acid comprising second stream (2) within the first reactor (R1) to a first reaction mixture (3), said first reaction mixture (3) comprising a first liquid/liquid mixed phase of an acid phase and an organic phase comprising mononitrotoluene, feeding the first reaction mixture (3) into a first separation device (S1), separating the first reaction mixture (3) within the first separation device (S1) into a first forward stream (4) having a flow direction to a second process step and a first backward stream (5) having a flow direction back to the first reactor (R1), said method having a second process step comprising feeding the first forward stream (4) into a second reactor (R2), feeding a nitric acid comprising third stream (6) and a sulfuric acid comprising fourth stream (7) into the second reactor (R2), reacting of the first forward stream (4), the nitric acid comprising third stream (6) and the sulfuric acid comprising fourth stream (7) within the second reactor (R2) to a second reaction mixture (8), said second reaction mixture (8) comprising a second liquid/liquid mixed acid phase and an organic phase comprising mononitrotoluene and dinitrotoluene, feeding the second reaction mixture (8) into a second separation device (S2), separating the second reaction mixture (8) within the second separation device (S2) into a second forward stream (9) having a flow direction to a process output and a second backward stream (10) having a flow direction back to the first reactor (R1), wherein fine separating of at least one of the streams (4, 5, 9, 10) after the first separation step (S1) and/or the second separation step (S2) in a coalescer is carried out.

Classes IPC  ?

• C07C 205/00 - Composés contenant des groupes nitro liés à un squelette carboné
• C07C 201/08 - Préparation de composés nitrés par substitution d'atomes d'hydrogène par des groupes nitro

Abrégé

Proposed is a separation method in a toluene to dinitrotoluene process, wherein said method with a first process step comprising feeding a toluene comprising first stream (1) and a nitric acid comprising second stream (2) into a first reactor (R1), reacting of the toluene comprising first stream (1) and the nitric acid comprising second stream (2) within the first reactor (R1) to a first reaction mixture (3), said first reaction mixture (3) comprising a first liquid/liquid mixed phase of an acid phase and an organic phase comprising mononitrotoluene, feeding the first reaction mixture (3) into a first separation device (S1), separating the first reaction mixture (3) within the first separation device (S1) into a first forward stream (4) having a flow direction to a second process step and a first backward stream (5) having a flow direction back to the first reactor (R1), said method having a second process step comprising feeding the first forward stream (4) into a second reactor (R2), feeding a nitric acid comprising third stream (6) and a sulfuric acid comprising fourth stream (7) into the second reactor (R2), reacting of the first forward stream (4), the nitric acid comprising third stream (6) and the sulfuric acid comprising fourth stream (7) within the second reactor (R2) to a second reaction mixture (8), said second reaction mixture (8) comprising a second liquid/liquid mixed acid phase and an organic phase comprising mononitrotoluene and dinitrotoluene, feeding the second reaction mixture (8) into a second separation device (S2), separating the second reaction mixture (8) within the second separation device (S2) into a second forward stream (9) having a flow direction to a process output and a second backward stream (10) having a flow direction back to the first reactor (R1), wherein fine separating of at least one of the streams (4, 5, 9,10) after the first separation step (S1) and/or the second separation step (S2) in a coalescer is carried out.

Classes IPC  ?

• C07C 201/08 - Préparation de composés nitrés par substitution d'atomes d'hydrogène par des groupes nitro

Abrégé

Proposed is a separation method in a toluene to dinitrotoluene process, wherein said method with a first process step comprising feeding a toluene comprising first stream (1) and a nitric acid comprising second stream (2) into a first reactor (R1), react- ing of the toluene comprising first stream (1) and the nitric acid comprising second stream (2) within the first reactor (R1) to a first reaction mixture (3), said first reaction mixture (3) comprising a first liquid/liquid mixed phase of an acid phase and an organic phase comprising mononitrotoluene, feeding the first reaction mixture (3) into a first separation device (S1), separating the first reaction mixture (3) within the first separa- tion device (S1) into a first forward stream (4) having a flow direction to a second process step and a first backward stream (5) having a flow direction back to the first reactor (R1), said method having a second process step comprising feeding the first forward stream (4) into a second reactor (R2), feeding a nitric acid comprising third stream (6) and a sulfuric acid comprising fourth stream (7) into the second reactor (R2), reacting of the first forward stream (4), the nitric acid comprising third stream (6) and the sulfuric acid comprising fourth stream (7) within the second reactor (R2) to a second reaction mix- ture (8), said second reaction mixture (8) comprising a second liquid/liquid mixed acid phase and an organic phase comprising mononitrotoluene and dinitrotoluene, feeding the second reaction mixture (8) into a second separation device (S2), separating the second reaction mixture (8) within the second separation device (S2) into a second forward stream (9) having a flow direction to a process output and a second backward stream (10) having a flow direction back to the first reactor (R1), wherein fine separating of at least one of the streams (4, 5, 9,10) after the first separa- tion step (S1) and/or the second separation step (S2) in a coalescer is carried out.

Classes IPC  ?

• C07C 205/06 - Composés contenant des groupes nitro liés à un squelette carboné ayant des groupes nitro liés à des atomes de carbone de cycles aromatiques à six chaînons
• C07C 201/08 - Préparation de composés nitrés par substitution d'atomes d'hydrogène par des groupes nitro