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Aniline post processing system and method

A technology of aniline and nitrobenzene, which is applied in chemical instruments and methods, preparation of amino compounds, preparation of organic compounds, etc., can solve the problems of blockage of heat exchangers by dust and other problems, and achieve the effect of improving the time of continuous operation.

Inactive Publication Date: 2008-08-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this technology can completely solve the problem that the heat exchanger behind the aniline reactor is blocked by dust, and truly realize continuous operation

Method used

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  • Aniline post processing system and method
  • Aniline post processing system and method
  • Aniline post processing system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The cylinder wall of the device (2), the multi-layer inclined baffle area (3), the floating valve structure area (4) and the nozzles (2a-2f) are successively connected to form a complete catalyst dust treatment and aniline reduction process. Apparatus for nitrobenzene content (2). Wherein the heights of the multi-layer oblique baffle area (3) and the floating valve structure area (4) are respectively 1 time and 5 times the diameter of the device (2). Connect the bottom inlet (2a) of the device (2) with pipes. Each nozzle of the device (2) is connected with equipment such as heat exchangers (6, 7) and settling tank (5) one by one with pipelines to form a complete aniline post-treatment system (1).

[0053] The bottom of the tower of the device (2) is first poured into aniline (60° C.) with a certain liquid level height (0.5 times of the diameter of the device). The superheated gas (190 ℃, 0.2MPa (absolute pressure), the volume fraction of hydrogen, water and aniline ar...

Embodiment 2

[0058] The cylinder wall of the device (2), the multi-layer inclined baffle area (3), the floating valve structure area (4) and the nozzles (2a-2f) are successively connected to form a complete catalyst dust treatment and aniline reduction process. Apparatus for nitrobenzene content (2). Wherein the heights of the multi-layer oblique baffle area (3) and the floating valve structure area (4) are respectively 0.5 times and 5 times the diameter of the device (2). Connect the bottom inlet (2a) of the device (2) with pipes. Each nozzle of the device (2) is connected with equipment such as heat exchangers (6, 7) and settling tank (5) one by one with pipelines to form a complete aniline post-treatment system (1).

[0059] The bottom of the device (2) is first filled with aniline (40° C.) at a certain liquid level (1 times the diameter of the device). Superheated gas (200°C, 0.135MPa (absolute pressure), volume fraction of hydrogen, water and aniline were 72%, 18%, 9%, other substan...

Embodiment 3

[0064] The cylinder wall of the device (2), the multi-layer inclined baffle area (3), the floating valve structure area (4) and the nozzles (2a-2f) are successively connected to form a complete catalyst dust treatment and aniline reduction process. Apparatus for nitrobenzene content (2). Wherein the heights of the multi-layer oblique baffle area (3) and the floating valve structure area (4) are respectively 10 times and 5 times the diameter of the device (2). Connect the bottom inlet (2a) of the device (2) with pipes. Each nozzle of the device (2) is connected with equipment such as heat exchangers (6, 7) and settling tank (5) one by one with pipelines to form a complete aniline post-treatment system (1).

[0065] The bottom of the device (2) is first filled with aniline (40° C.) at a certain liquid level (1.5 times the diameter of the device). The superheated gas (240 ℃, 2MPa (absolute pressure), the volume fraction of hydrogen, water and aniline are 51%, 32%, 16% respectiv...

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Abstract

Disclosed is a post-processing system and method of aniline, which relates to a device and method for processing catalyst powder after fluidized bed for hydrogenation preparing aniline from nitrobenzene, and reducing nitrobenzene content in aniline. In the invention, over-hot gas containing catalyst powder is directly fed into a device provided with an inclined barrier and a valve tray structure. Rising of catalyst powder is prevented by the inclined barrier, the valve tray structure and liquid spraying, the sparaying liquid at the bottome is discharged timely. The invention also proposes three methods for processing the gas induced from the device to respectively obtain eligible aniline (wherein nitrobenzene content is less than 0.5 mg / kg), eligible wastewater (wherein aniline content is less than 50 mg / kg) and eligible hydrogen (aniline is less than 0.1% and used for circulation). The device of the invention can effectively solve the default that, the catalyst powder is deposited in the cooled liquid thereby jamming a heat changer and increasing the process resistance), and realize long-period continuous operation.

Description

technical field [0001] The invention belongs to the field of chemical equipment, and in particular relates to an equipment and a method for simultaneously realizing the functions of treating catalyst dust and reducing the content of nitrobenzene in aniline. Background technique [0002] Aniline is a very important class of chemical products. With the wide application of polyurethane in the fields of construction, automobiles, electrical appliances and packaging materials, the output of methyl diisocyanate (MDI for short, prepared from aniline), the main raw material of polyurethane, has increased rapidly, resulting in a substantial increase in the consumption of aniline. . At present, aniline is mainly used in the production of MDI and rubber additives, and can also be used in the fields of pesticides, organic pigments and pharmaceuticals. The world's annual demand is about 4 million tons. [0003] At present, there are three methods for industrial production of aniline, n...

Claims

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Application Information

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IPC IPC(8): C07C211/46C07C209/36C07C209/84
Inventor 骞伟中魏飞王垚金涌汪展文
Owner TSINGHUA UNIV
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