Method for enhancing stirring effect of esterification reaction kettle

Abstract

The invention discloses a method for enhancing the stirring effect of an esterification reaction kettle. The method comprises the following steps: step 1, increasingly accelerating a stirrer of the esterification reaction kettle a plurality of times before stirring of the stirrer, wherein a speed is maintained for 5-15 minutes after each acceleration; and step 2, progressively decelerating the stirrer multiple times, wherein a speed is maintained for 5-15 minutes after each deceleration. The method for enhancing the stirring effect of the esterification reaction kettle is beneficial to productquality and production stability.

Description

Technical field:

[0001] The invention relates to the field of polyester production, in particular to a method for enhancing the stirring effect of an esterification reactor. Background technique:

[0002] The production of polyester is a production process of esterification reaction of purified terephthalic acid (PTA) and ethylene glycol (EG), followed by polycondensation reaction. Whether the esterification reaction is sufficient in the polyester production process determines the stability of subsequent production and product quality. During the esterification process, in addition to mainly controlling the process parameters such as temperature and pressure in the esterification reactor, the speed of the esterification reactor stirrer is also a very important parameter. In the esterification reaction, the agitator plays the role of mixing the materials evenly, enhancing heat and mass transfer, and making the materials fully contact and chemical reaction occurs. If the agi...

Examples

Embodiment 1

[0015] A method for enhancing the stirring effect of the esterification reactor. First, according to the requirements of the polyester production process, set the required speed for the stirring of the esterification reactor, and then use the multi-step control function of the frequency converter to automatically perform speed-up and deceleration control. Specifically , including the following steps,

[0016] Step 1, when the agitator of the esterification reactor is stirring, the speed increase is carried out twice, wherein, the first speed increase is 5%, and the operation is 10 minutes; Increase the speed by 5% on the basis and run for 10 minutes;

[0017] Step 2: After the two speed-up runs, start to decelerate, the first time decelerates by 5%, and runs for 10 minutes; after the first deceleration ends, the second time decelerates by 5% on the basis of the first deceleration, and runs for 10 minutes;

[0018] Step 3: Return to the speed before the speed increase, and aft...

Technical field:

[0001] The invention relates to the field of polyester production, in particular to a method for enhancing the stirring effect of an esterification reactor. Background technique:

[0002] The production of polyester is a production process of esterification reaction of purified terephthalic acid (PTA) and ethylene glycol (EG), followed by polycondensation reaction. Whether the esterification reaction is sufficient in the polyester production process determines the stability of subsequent production and product quality. During the esterification process, in addition to mainly controlling the process parameters such as temperature and pressure in the esterification reactor, the speed of the esterification reactor stirrer is also a very important parameter. In the esterification reaction, the agitator plays the role of mixing the materials evenly, enhancing heat and mass transfer, and making the materials fully contact and chemical reaction occurs. If the agi...

Examples

Embodiment 1

[0015] A method for enhancing the stirring effect of the esterification reactor. First, according to the requirements of the polyester production process, set the required speed for the stirring of the esterification reactor, and then use the multi-step control function of the frequency converter to automatically perform speed-up and deceleration control. Specifically , including the following steps,

[0016] Step 1, when the agitator of the esterification reactor is stirring, the speed increase is carried out twice, wherein, the first speed increase is 5%, and the operation is 10 minutes; Increase the speed by 5% on the basis and run for 10 minutes;

[0017] Step 2: After the two speed-up runs, start to decelerate, the first time decelerates by 5%, and runs for 10 minutes; after the first deceleration ends, the second time decelerates by 5% on the basis of the first deceleration, and runs for 10 minutes;

[0018] Step 3: Return to the speed before the speed increase, and aft...