How to purify the nitration product and equipment

    公开(公告)号:JP2014518866A

    公开(公告)日:2014-08-07

    申请号:JP2014510693

    申请日:2012-05-18

    CPC classification number: C07C201/16 B01J19/24 B01J2219/24 C07C205/06

    Abstract: 【課題】 本願発明は、残留硝化酸の除去の後、ニトロ化可能な芳香族化合物のニトロ化において得られる粗ニトロ化生成物から不純物を除去するための方法及び装置又はプラントを提供することを目的の1つとする。
    【解決手段】 本願発明は、残留硝化酸の除去の後、粗生成物を処理することによって、ニトロ化可能な芳香族化合物のニトロ化によって得られる粗ニトロ化生成物から不純物を除去する方法において、(a)粗ニトロ化生成物が、最初に洗浄媒体と接触し、該粗ニトロ化生成物及び洗浄媒体が、結果としてエマルションを生じるような方法でお互いに分散されること、且つ、(b)結果として生じるエマルションが、それに続いて管型反応器に送られ、粗ニトロ化生成物に最初から存在する不純物が、洗浄媒体に移動し、及び/若しくは、それによって前記管型反応器をエマルションが通過する間に中和されることを特徴とするものである。
    【選択図】 なし

    Method for recovering mixed acid mixture from the nitration process

    公开(公告)号:JP4560821B2

    公开(公告)日:2010-10-13

    申请号:JP2006282521

    申请日:2006-10-17

    CPC classification number: C07C201/16 C07C205/12 C07C205/06

    Abstract: Removing and recovering nitrating acid mixtures of nitric acid, sulphuric acid and oxides of nitrogen, from the nitrated crude products occurring in the nitration of nitratable aromatic compounds, after the nitrating acid has been separated off, by a multistage extraction process involves one stage of a cross-flow extraction and another stage of a countercurrent extraction. An independent claim is also included for production plant for nitrating nitratable aromatic compounds with subsequent purification of the nitrated products, including removal and recovery of nitrating acid mixtures of sulphuric acid, nitric acid and oxides of nitrogen, comprises: (a) a nitrating unit for nitrating nitratable aromatic compounds, having at least one appropriate reaction containers for carrying out the nitration reactions; and (b) arranged in the production line downstream of the nitrating unit, a unit for carrying out acidic scrubbing by units of extraction and is comprising a cross-flow extraction unit for carrying out acidic scrubbing of nitrated crude products by units of cross-flow extraction, and in the production line downstream of the cross-flow extraction unit, a countercurrent extraction unit for carrying out acidic scrubbing of the nitrated crude products, scrubbed beforehand by units of cross-flow extraction, by units of countercurrent extraction.

    JPS591255B2 -
    289.
    发明专利

    公开(公告)号:JPS591255B2

    公开(公告)日:1984-01-11

    申请号:JP4264176

    申请日:1976-04-16

    Applicant: Bayer Ag

    CPC classification number: C07C201/16 C07C205/06

    Abstract: 1496996 Preparing 1,5- and 1,8-dinitronaphthalenes BAYER AG 14 April 1976 [19 April 1975] 15272/76 Heading C2C The invention comprises a process for isolating 1,5- and 1,8-dinitronaphthalenes from a mixture of dinitronaphthalenes which contains at least said 1,5- and 1,8-isomers in which the mixture is treated first with a more polar solvent for dinitronaphthalenes to dissolve all the isomers except the 1,5-dinitronaphthalene which is recovered, the solution of isomers is then treated, after removal of the solvent therefrom, at elevated temperature with a less polar aromatic solvent for dinitronaphthalenes so as to dissolve all materials other than 1,8-dinitronaphthalene which is thus recovered, the more polar solvent being employed in an amount of 1À2 to 20 times the weight of 1,8-isomer in the mixture and the less polar solvent in an amount of 1 to 20 times the weight of said 1,8-isomer.

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