公开(公告)号：US20150099906A1

公开(公告)日：2015-04-09

申请号：US14046068

申请日：2013-10-04

Applicant: Bayer MaterialScience AG

Inventor： Thomas Knauf ,  Jurgen Munnig ,  Joerg Schmiedler

IPC: C07C201/08

CPC classification number: C07C201/08 ,  C07C201/16 ,  C07C205/06

Abstract: The present invention relates to a method for producing nitrobenzene, in which the waste gas streams accruing in the process and containing benzene and (traces of) nitrobenzene, possibly low- and medium-boiling components, possibly non-condensable gases and possibly water, optionally after removal of nitrogen oxides, are scrubbed in an absorption column with nitrobenzene, which comprises only very small amounts (maximum 50 ppm) of benzene and is distributed by means of a liquid distributor at a rate of 50 to 200 drip points per square metre, preferably 60 to 120 drip points per square metre, wherein (i) a liquid stream containing benzene and nitrobenzene, possibly organic low- and medium-boiling components and additionally containing sulfuric acid if sulfuric acid is used as the scrubbing agent and (ii) waste gas depleted in benzene and possibly in organic low- and medium-boiling components are obtained. A waste gas purified by the method according to the invention is particularly suitable for burning in a thermal exhaust air treatment process.

公开(公告)号：US20150336875A9

公开(公告)日：2015-11-26

申请号：US14046068

申请日：2013-10-04

Applicant: Bayer MaterialScience AG

Inventor： Thomas Knauf ,  Jurgen Munnig ,  Joerg Schmiedler

IPC: C07C201/08

CPC classification number: C07C201/08 ,  C07C201/16 ,  C07C205/06

Abstract: The present invention relates to a method for producing nitrobenzene, in which the waste gas streams accruing in the process and containing benzene and (traces of) nitrobenzene, possibly low- and medium-boiling components, possibly non-condensable gases and possibly water, optionally after removal of nitrogen oxides, are scrubbed in an absorption column with nitrobenzene, which comprises only very small amounts (maximum 50 ppm) of benzene and is distributed by means of a liquid distributor at a rate of 50 to 200 drip points per square metre, preferably 60 to 120 drip points per square metre, wherein (i) a liquid stream containing benzene and nitrobenzene, possibly organic low- and medium-boiling components and additionally containing sulfuric acid if sulfuric acid is used as the scrubbing agent and (ii) waste gas depleted in benzene and possibly in organic low- and medium-boiling components are obtained. A waste gas purified by the method according to the invention is particularly suitable for burning in a thermal exhaust air treatment process.

Abstract translation: 本发明涉及生产硝基苯的方法，其中在该方法中产生的含有苯和（痕量）硝基苯的废气流，可能是低沸点和中沸点组分，可能是不可冷凝气体和可能的水，任选地 在除去氮氧化物之后，用硝基苯洗涤吸收塔，硝基苯仅包含极少量（最大50ppm）的苯，并以50至200滴每平方米的液滴分配器分配， 优选60至120滴/平方米，其中（i）含有苯和硝基苯的液体流，可能是有机低沸点和中沸点组分，如果使用硫酸作为洗涤剂，另外含有硫酸，和（ii）废物 获得了在苯中以及可能在有机低沸点和中沸点组分中贫化的气体。 通过根据本发明的方法净化的废气特别适用于在热排气处理过程中燃烧。

公开(公告)号：US09227909B2

公开(公告)日：2016-01-05

申请号：US14046068

申请日：2013-10-04

Applicant: Bayer MaterialScience AG

Inventor： Thomas Knauf ,  Jurgen Munnig ,  Joerg Schmiedler

IPC: C07C201/08

CPC classification number: C07C201/08 ,  C07C201/16 ,  C07C205/06

Abstract: The present invention relates to a method for producing nitrobenzene, in which the waste gas streams accruing in the process and containing benzene and (traces of) nitrobenzene, possibly low- and medium-boiling components, possibly non-condensable gases and possibly water, optionally after removal of nitrogen oxides, are scrubbed in an absorption column with nitrobenzene, which comprises only very small amounts (maximum 50 ppm) of benzene and is distributed by means of a liquid distributor at a rate of 50 to 200 drip points per square meter, preferably 60 to 120 drip points per square meter, wherein (i) a liquid stream containing benzene and nitrobenzene, possibly organic low- and medium-boiling components and additionally containing sulfuric acid if sulfuric acid is used as the scrubbing agent and (ii) waste gas depleted in benzene and possibly in organic low- and medium-boiling components are obtained. A waste gas purified by the method according to the invention is particularly suitable for burning in a thermal exhaust air treatment process.

Abstract translation: 本发明涉及生产硝基苯的方法，其中在该方法中产生的含有苯和（痕量）硝基苯的废气流，可能是低沸点和中沸点组分，可能是不可冷凝气体和可能的水，任选地 在除去氮氧化物之后，用硝基苯洗涤吸收塔，硝基苯仅包含极少量（最大50ppm）的苯，并以50至200滴每平方米的液滴分配器分配， 优选60至120滴/平方米，其中（i）含有苯和硝基苯的液体流，可能是有机低沸点和中沸点组分，如果使用硫酸作为洗涤剂，另外含有硫酸，和（ii）废物 获得了在苯中以及可能在有机低沸点和中沸点组分中贫化的气体。 通过根据本发明的方法净化的废气特别适用于在热排气处理过程中燃烧。