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The Method of On-line Transformation of Polyester

A technology of polyester and additives, which is applied in the field of polyester on-line production conversion equipment and the use of this equipment for production conversion. It can solve problems affecting the economic benefits of enterprises, and achieve the effect of quickly realizing online production conversion, ensuring normal and stable production, and reducing material volume.

Active Publication Date: 2016-06-22
ZHEJIANG WANKAI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of online production conversion, the production of transitional materials seriously affects the economic benefits of the enterprise

Method used

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  • The Method of On-line Transformation of Polyester

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the online conversion equipment of the present embodiment includes an additive mixing tank 1, a phthalic acid feeding tank 2, an additive mixing tank 3, a polymerization mixing tank 4, an esterification kettle 5 and a polycondensation kettle 6, and the additive mixing tank 1 The volume is 10% to 100% of the volume of the polymerization mixing tank 4 . The feed port of the additive mixing tank 1 is connected with an additive feeding tank 11 and has a first agitator 12, and the discharge port has a first metering scale 13; the discharge port of the phthalic acid feeding tank 2 has a second metering scale 21 , there is a second agitator 31 in the additive configuration tank 3, the polycondensation kettle 6 has a discharge port 61 and a third agitator 62, the discharge end of the esterification kettle 5 is connected with the feed port of the polycondensation kettle 6 and has a fourth stirring device 51, the fifth agitator 41 is arranged in the po...

Embodiment 2

[0033] Use the on-line conversion equipment of embodiment 1 to change production process of isophthalic acid content from high to low, the on-line conversion method of the present embodiment comprises the following steps:

[0034] (1) Within 3 hours before changing production, configure 10 tons of mixed slurry through additive feeding tank 11 and additive mixing tank 1. By mass, the mixed slurry is isophthalic acid: terephthalic acid=6:4, stirred 5h;

[0035] (2) Turn on the conversion equipment, reduce the liquid level of the polymerization slurry tank 4 to 5% of the tank volume, and transport the mixed slurry configured in step (1) to the polymerization slurry tank 4 within 10 minutes, and simultaneously, respectively Supplement terephthalic acid and ethylene glycol through phthalic acid feeding tank 2 and additive configuration tank 3 in the polymerization slurry mixing tank 4, and the addition of terephthalic acid and ethylene glycol is consistent with before changing prod...

Embodiment 3

[0038] Using the on-line conversion equipment of embodiment 1 to change the production process of isophthalic acid content from low to high, the on-line conversion method of the present embodiment comprises the following steps:

[0039] (1) Within 8 hours before changing production, configure 18 tons of mixed slurry through additive feeding tank 11 and additive mixing tank 1. By mass, the mixed slurry is isophthalic acid: terephthalic acid=2:8, stirred 10h;

[0040] (2) Turn on the conversion equipment, reduce the liquid level of the polymerization mixing tank 4 to 10% of the volume of the tank body, transport the mixed slurry configured in step (1) to the polymerization mixing tank 4 within 45 minutes, and simultaneously, respectively Supplement terephthalic acid and ethylene glycol through phthalic acid feeding tank 2 and additive configuration tank 3 in the polymerization slurry mixing tank 4, and the addition of terephthalic acid and ethylene glycol is consistent with befo...

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Abstract

The present invention relates to a polyester on-line conversion equipment and a method for using the equipment for production conversion. The invention sets up equipment specially used for polyester on-line conversion. The command pre-configures the required additive slurry; and, since the additive slurry is pre-configured, there is no need to temporarily configure it in the polymerization mixing tank, so the liquid level of the polymerization mixing tank can be reduced to a very low level, even below 1 %, thereby minimizing the logistics volume in the slurry, thereby reducing the amount of transition material produced during the conversion process; the pre-configured slurry in the additive mixing tank can quickly adjust the concentration of additives in the esterification tank, thereby ensuring At the same time of normal and stable production, the purpose of quickly realizing online production changeover is achieved, and the transition time for online production changeover is reduced; the method of the invention has simple process control and is easy to realize industrialization.

Description

technical field [0001] The invention relates to the technical field of polyester on-line production conversion, and specifically refers to a polyester on-line production conversion equipment and a method for using the equipment for production conversion. Background technique [0002] With the increasingly fierce competition among polyester manufacturers, polyester products are developing in a multi-variety direction. In order to meet market demand, PET manufacturers are required to change production frequently. For the PET plant, there are two ways to change production: one is to stop production first, clean the system and then change production; the other is to change production online. The former is costly, takes a long time, and will produce variable starting and stopping materials due to different operating levels; the latter has no production stoppage, short product switching time, and faster response to the market, which is conducive to increasing production flexibilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/78C08G63/181C08G63/183
Inventor 曹爱兵王元前熊开庆余小斌杨逢春吴才军肖海军
Owner ZHEJIANG WANKAI NEW MATERIAL
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