Process for continuous preparing diruitro methylbenzele and apparatus thereof

A technology for dinitrotoluene and nitrotoluene, which is applied in the field of continuous preparation of dinitrotoluene and its devices, can solve the problems of many by-products, long routes and many equipment, and achieves the effect of improving quality

Active Publication Date: 2006-06-28
GANSU YINGUANG CHEM IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the existing process, there are defects such as low yield of finished pro

Method used

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  • Process for continuous preparing diruitro methylbenzele and apparatus thereof
  • Process for continuous preparing diruitro methylbenzele and apparatus thereof
  • Process for continuous preparing diruitro methylbenzele and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The diameter of the reaction kettle is 180cm, and the height is 270cm; the diameter of the guide tube in the reaction kettle is 105cm, and the area of ​​the stirring zone is 0.87m 2 , the circulation area is 0.98m 2 , the ratio of the area of ​​the two zones is 1:1.3; 3 / min, the flow velocity in the stirring zone is 1.11m / s, the flow velocity in the circulation zone is 0.98m / s, and the ratio of the flow velocity in the two zones is 0.98.

[0061] The diameter of the separator is 240cm, the height is 80cm, and the separation area is 4m without disc separator 2 Left and right, after adding a group of disc separators with an angle of 120 degrees, an interval of 25 mm between the steel plates, an angle of 45 degrees between the steel plate and the bottom plane of the separator, and a height of 70 cm, the separation area is 27 m 2 The separation area has increased by nearly 7 times; the diameter of the valve seat of the waste acid circulation device in the separator is 50...

Embodiment 2

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[0069] best practice

[0070] The diameter of the reactor is 130cm, and the height is 240cm; the diameter of the diversion tube in the reactor is 50cm, and the area of ​​the stirring zone is 0.19m 2 , the area of ​​the circulation zone is 0.27m 2 , the ratio of the area of ​​the two areas is 1:1.4; 3 / min, the flow velocity in the stirring zone is 1.92m / s, the flow velocity in the circulation zone is 1.35m / s, and the ratio of the flow velocity in the two zones is 0.7.

[0071] The diameter of the separator is 160cm, the height is 60cm, and the separation area is 1.88m without disc separator 2 Left and right, add a set of disc-type separation devices with an angle of 120 degrees, an interval of 25 mm between the steel plates, an angle of 45 degrees between the steel plate and the bottom plane of the separator, and a height of 55 cm. The separation area is 7.5 m 2 The separation area has increased by about 4 times; the diameter of the valve seat of ...

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PUM

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Abstract

The invention relates to a method to continuously produce dinitrotoluene and the device that is suited to the method. The method adopts two steps to make dinitrotoluene and organic phase and spent acid phase are separated. The acid phase is cycling used in the first and the second stage; toluene, nitric acid and mixture acid are added into the center of draft tube of reactor synchronously, mixing fully, cycling in the center and outside of the draft tube; after fully reacting, the taking gravity settling separation in the separator where spent acid cycling device, stop cycling device, and disc type separating device are installed.

Description

technical field [0001] The present invention relates to the method for preparing dinitrotoluene (DNT) by nitration of toluene in two steps with nitric acid and sulfur mixed acid, specifically, what the present invention relates to is the continuous preparation of dinitrotoluene (DNT) in a specially designed device method. technical background [0002] Dinitrotoluene (DNT), referred to as DNT, is mainly used as a precursor for the preparation of toluene diisocyanate, and its molecular formula is C 6 h 3 CH 3 (NO 2 ) 2 , it has six isomers in total, and it needs to produce dinitrotoluene with two structures of 2,4-DNT and 2,6-DNT. The mass ratio of 2,4-DNT and 2,6-DNT in the product is about It is 80 / 20, so it is also called (80 / 20) DNT. The other four structures of dinitrotoluene are all by-products. [0003] The conventional industrial method for preparing dinitrotoluene is a two-step constant temperature nitration reaction of toluene and nitric acid mixed acid, see U...

Claims

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Application Information

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IPC IPC(8): C07C201/08C07C205/06
Inventor 尹世英张金鹏张路遥雍亚兰李明
Owner GANSU YINGUANG CHEM IND GRP CO LTD
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