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Two-stage gas flow-fluidized bed drying process and apparatus with nitogen circulated adipic acid and overheated steam

A technology of superheated steam and drying method, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., which can solve the problems of large exhaust gas and dust emissions, easy combustion and explosion, and pollution of adipic acid, etc., and achieve reduction Heat loss, not easy to stick to the wall, long residence time effect

Active Publication Date: 2007-12-19
TIANHUA INST OF CHEM MACHINERY & AUTOMATION
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  • Description
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AI Technical Summary

Problems solved by technology

[0003] The traditional drying method in the production process of adipic acid is open-circuit air drying or fluidized bed drying with hot air as the drying medium. Both of them belong to hot air drying. It is easy to generate static electricity. In the open air drying process, adipic acid is completely in contact with hot air, and combustion and explosion may occur from time to time, especially in fluidized bed drying. Because of the long residence time, the temperature is difficult to control and the temperature is slightly higher. , not only material denaturation, but also contact with air for a long time, more prone to combustion and explosion; ② open air airflow drying or fluidized bed drying are all hot air drying, high energy consumption, large emissions of exhaust gas and dust; ③ open air Airflow drying or fluidized bed drying is easy to bring in impurities in the air, which will pollute adipic acid and affect product quality

Method used

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  • Two-stage gas flow-fluidized bed drying process and apparatus with nitogen circulated adipic acid and overheated steam
  • Two-stage gas flow-fluidized bed drying process and apparatus with nitogen circulated adipic acid and overheated steam

Examples

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Effect test

Embodiment 1

[0039]Adipic acid wet material with a moisture content of 10-15% enters the material disperser 2 from the rotating feeder 1, and the agglomerated viscous materials are dispersed under the action of the disperser, and enter the Venturi at the side entrance Under the action of the negative pressure generated by the hot nitrogen of the feeder 3, adipic acid is sucked into the venturi feeder 3 from the bottom of the material disperser 2, and at the same time, the hot nitrogen and adipic acid form a gas at the side outlet of the venturi feeder 3 A homogeneous mixture of solids, adipic acid is forced into the gas-solid separation dryer 4 after being accelerated by hot nitrogen. The gas-solid separation dryer 4 has a single-cylinder structure, which has the dual functions of separation and pre-drying. At the same time as the solid separation, the constant-speed air flow is pre-dried instantaneously. After the gas-solid separation and pre-drying are completed, the hot nitrogen with a smal...

Embodiment 2

[0043] Adipic acid wet material with a moisture content of 10-15% enters the material disperser 2 from the rotating feeder 1, and the agglomerated viscous materials are dispersed under the action of the disperser, and enter the Venturi at the side entrance Under the action of the negative pressure generated by the hot nitrogen of the feeder 3, adipic acid is sucked into the venturi feeder 3 from the bottom of the material disperser 2, and at the same time, the hot nitrogen and adipic acid form a gas at the side outlet of the venturi feeder 3 A homogeneous mixture of solids, adipic acid is forced into the gas-solid separation dryer 4 after being accelerated by hot nitrogen. The gas-solid separation dryer 4 has a double-cylinder structure, which has the dual functions of separation and pre-drying. At the same time of solid separation, an instantaneous pre-drying of airflow at constant speed is carried out. After the gas-solid separation and pre-drying are completed, hot nitrogen wit...

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Abstract

The present invention is two-stage adipic acid drying process with circulating nitrogen and overheated steam. The technological process includes treating wet adipic acid material through a rotary feeder, a disperser and a solid-gas separating drier; drying in the fluidized bed of the drying section in a fluidized bed drier under the combined action of hot nitrogen and steam; and cooling in the cooling section of the fluidized bed drier under the combined action of cold nitrogen and cooling medium to obtain adipic acid product with temperature not higher than 25 deg.c and humidity not higher than 0.2 %. The process of the present invention is superior to traditional adipic acid drying process with hot air as the drying medium.

Description

Technical field [0001] The invention relates to the technical field of drying of inflammable, explosive, and electrostatic materials. It is a two-stage drying method of adipic acid with nitrogen circulation and superheated steam "air flow-fluidized bed", belonging to superheated steam and hot air drying. Background technique [0002] Adipic acid (commonly known as fatty acid) is a loose crystal with a wide particle size distribution. It is corrosive, flammable, explosive, and easy to generate static electricity. It is easy to soften and agglomerate and deteriorate when the temperature is too high. It has a melting point of 153°C and a boiling point. 337.5℃, the explosion limit is 7.9% (upper limit) / 3.94% (lower limit). It is the main raw material for nylon 66 synthetic fiber, polyester, artificial rubber, lubricants, and plasticizers. [0003] The traditional drying method in the production process of adipic acid is open-air drying or fluidized bed drying with hot air as the dryi...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C55/14
Inventor 赵旭文化明张麦奎张毅岳永飞
Owner TIANHUA INST OF CHEM MACHINERY & AUTOMATION
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