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Method for drying terephthalic acid under micro-negative pressure

A technology of terephthalic acid and micro-negative pressure, which is applied in the drying field of terephthalic acid, can solve the problems of poor environment in the working area, shortened service life, and impact on production capacity, so as to reduce the probability of entering the gap of sealing components , reduce production costs and prolong service life

Inactive Publication Date: 2013-03-06
ACTION PERFECT ENG XIAMEN
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  • Abstract
  • Description
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Problems solved by technology

[0004] b. When the acetic acid vapor leaks out, it will also carry the dried PTA powder into the gap between the sealing components, so the wear rate of the sealing components will be accelerated, and the service life will be shortened, which will eventually lead to the failure of the seal, forcing the stop to replace the sealing components, affecting the production capacity
[0005] Due to the existence of the above problems, it not only affects the production capacity of the PTA dryer in actual operation, but also makes the internal environment of the working area worse, and even causes the factory's gas emission indicators to exceed the standard

Method used

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  • Method for drying terephthalic acid under micro-negative pressure

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Embodiment 1

[0023] Example 1 as figure 1 As shown, in the dryer 1, the 4.0-8.0kg / cm 2 g low-pressure steam 6 heats the terephthalic acid wet material with a moisture content of 10wt% to 14wt% from 4 to 120°C, and the evaporated acetic acid and water vapor are heated to 80°C to 130°C by the heat exchanger 33 traveling in reverse °C N 2 The air flow 5 takes it away, and the low-pressure steam condensate 7 enters the steam recovery system.

[0024] After the saturated gas stream 5 enters the washing tower 2, a small amount of terephthalic acid powder entrained is washed in the washing tower 2; the saturated N 2 Airflow 5 is cooled to 30°C to 50°C, most of the acetic acid and most of the water vapor carried in the airflow 5 are condensed, and the stream 8 composed of condensed acetic acid, water vapor and supplemented fresh acetic acid enters the feed preparation unit.

[0025] Washed and cooled N carrying a small amount of acetic acid and water vapor stream 2 The gas flow 5 is reheated t...

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Abstract

The invention discloses a method for drying terephthalic acid under a micro-negative pressure. The method for drying the terephthalic acid under the micro-negative pressure controls the operation pressure in a dryer body to be between 0 millimole H2O and -500 millimole H20 so as to ensure that the dryer works in a micro-negative pressure environment and realize the improvement on the surrounding working environment condition of the dryer, the reduction of the acid consumption and the prolongation of the service life of sealing components of the dryer.

Description

technical field [0001] The invention relates to a drying method of terephthalic acid. Background technique [0002] The terephthalic acid (hereinafter referred to as PTA) dryer is a rotatable cylinder, which is supported by a supporting wheel set and a supporting wheel set to support a slight back tilt, and the steam heating tubes are distributed concentrically in the cylinder. The steam enters from the rotary joint at the tail of the dryer, and enters the heating tubes through the steam chamber. The wet material is pushed into the body by the feeding screw conveyor, and with the rotation of the body, it exchanges heat with the steam in the heating tube to evaporate the moisture, and the material gradually dries and then enters the downstream air delivery system unit. The evaporated moisture is mainly acetic acid, which needs to be returned to the system for use. In the prior art, inert gas is sent from the tail of the dryer to mix with acetic acid vapor and then enters the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/26C07C51/42F26B3/06
Inventor 吴荣汉王荣赐
Owner ACTION PERFECT ENG XIAMEN
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