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CN105102419A 在甲苯至二硝基甲苯的方法中二硝基甲苯与混合酸的分离方法 有权

在甲苯至二硝基甲苯的方法中二硝基甲苯与混合酸的分离方法
摘要：
提供一种甲苯至二硝基甲苯方法中的分离方法，其中所述方法具有包括下列的第一过程步骤：将含甲苯的第一料流(1)和含硝酸的第二料流(2)进料至第一反应器(R1)，使含甲苯的第一料流(1)和含硝酸的第二料流(2)在第一反应器(R1)中反应生成第一反应混合物(3)，所述第一反应混合物(3)包含由酸相和含有一硝基甲苯的有机相得到的第一液/液混合相，将第一反应混合物(3)进料至第一分离设备(S1)中，将第一反应混合物(3)在第一分离设备(S1)中分离成具有至第二过程步骤流向的第一正向料流(4)和具有回到第一反应器(R1)流向的第一反向料流(5)；所述方法具有包括下列的第二过程步骤：将第一正向料流(4)进料至第二反应器(R2)，将含硝酸的第三料流(6)和含硫酸的第四料流(7)进料至第二反应器(R2)，使第一正向料流(4)、含硝酸的第三料流(6)和含硫酸的第四料流(7)在第二反应器(R2)内反应生成第二反应混合物(8)，所述第二反应混合物(8)包含第二液/液混合酸相和含一硝基甲苯和二硝基甲苯的有机相，将第二反应混合物(8)进料至第二分离设备(S2)中，将第二反应混合物(8)在第二分离设备(S2)中分离成具有至过程输出流向的第二正向料流(9)和具有回到第一反应器(R1)流向的第二反向料流(10)，其中，在第一分离步骤(S1)和/或第二分离步骤(S2)之后，在聚结器中进行至少一种料流(4、5、9、10)的精细分离。
摘要（英）：

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.

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