Method for controlling density ofsizing agent in hydrorefining work section of equipment of fine terephthalic acid

A technology of purified terephthalic acid and slurry concentration, which is applied in the preparation of carboxylate salts, chemical instruments and methods, and the preparation of organic compounds, and can solve problems such as unsatisfactory control quality, strong control effect, and difficulty in slurry concentration

Inactive Publication Date: 2004-10-27
SINOPEC YANGZI PETROCHEM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] 2. Since it takes a period of time from the motor speed to the slurry concentration (the time constant of the mixing tank is relatively large), when PID is controlled, only the current slurry concentration deviation is considered, which will easily cause the control effect to be too strong, resulting in slurry concentration fluctuation
Moreover, due to factors such as the content of TA in the beating water and the inability to directly detect the mass flow rate of TA, the control quality of conventional PID is not ideal, which brings great difficulties to the control of slurry concentration and affects the stability of subsequent hydrogenation reactions and PTA products. Yield increase

Method used

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  • Method for controlling density ofsizing agent in hydrorefining work section of equipment of fine terephthalic acid
  • Method for controlling density ofsizing agent in hydrorefining work section of equipment of fine terephthalic acid
  • Method for controlling density ofsizing agent in hydrorefining work section of equipment of fine terephthalic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] The control method of slurry concentration in this hydrorefining section takes the PTA device using the patented technology of Amoco Company as an example. In this device, the slurry tank ( figure 1 )'s main technical specifications are (outer diameter X height X wall thickness): Φ3600X5900X8, volume: 71.35m 3 . The specific implementation steps of the control method are:

[0097] 1. Under the condition of ensuring that the slurry concentration remains unchanged, the craftsman manually adjusts the speed of the two motors to calibrate the two screw propellers, and the screw propeller with the fastest material is used as the benchmark;

[0098] 2. After testing, it is determined that the speed coefficient of the reference screw propeller is 1.23, and the speed of the reference screw propeller motor is related to the mass flow rate of TA F 1 The coefficient N( figure 2) is 44.9;

[0099] 3. The speed of the reference propeller motor is changed in steps, and the transf...

Embodiment 2

[0109] The control method of the slurry concentration of the hydrorefining section, the PTA device and the parameters of each step are the same as those in Example 1.

[0110] The real-time operation results in Fig. 3: Before the dividing line is the manually controlled slurry concentration fluctuation curve, and after the dividing line is the slurry concentration fluctuation curve after the operation of the control method.

[0111] exist Figure 3.2 Among them, before the operation of this control method, the fluctuation range of slurry concentration is 24.63-23.73 when manual control is adopted, and the average value of slurry concentration is 24.2. Because the average value of the concentration is low at this time, when the control method is running, the set value of the slurry concentration is increased to 24.5, and the actual operation effect is: the fluctuation range of the slurry concentration is 24.75 to 24.3, and the average value of the slurry concentration is 24.52,...

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Abstract

A process for controlling the concentration of slurry in hydrorefining step of terephthalic acid refining equipment includes such steps as determining the relation between rotation speed of propeller's motor and TA mass flow, transforming the TA mass flow to slurry concentration at tank inlet, calculating current optimal control increment, transforming said slurry concentration to TA mass flow, transforming it to rotation speed of propeller's motor, under compensating static feedforward between slurry mass flow and TA mass flow, and adding the transformed feedforward and rotation speed increment to the PID control setting of motor speed.

Description

1. Technical field [0001] The invention belongs to the field of chemical reaction engineering, and in particular relates to a method for controlling slurry concentration, an important process parameter of a hydrofining section in the production of purified terephthalic acid (hereinafter referred to as PTA, or PureTerephthalic Acid). 2. Background technology [0002] In the production of PTA, the hydrofining process is to dissolve the crude terephthalic acid (TA, Terephthalic Acid) produced by the oxidation process in water, and undergo catalytic hydrogenation under high temperature and high pressure to separate impurities, so as to obtain fiber-grade purified terephthalic acid. Phthalic acid (PTA). [0003] The crude terephthalic acid (TA) produced by the oxidation section stored in the silo is sent to the slurry tank with agitator through the screw propeller, the screw conveyor and the rotary valve of the slurry tank respectively, and then the beating water is added to mix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/487C07C63/26
Inventor 王振新赵均邢建良陈曦黄树军乔一新邵之江钱积新王建平徐祖华
Owner SINOPEC YANGZI PETROCHEM
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