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