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Product color value control method for continuous production of PBT (polybutylece terephthalate) by PTA (pure terephthalic acid)

A control method and continuous method technology, applied in the control of product color value, PBT production and processing, PTA continuous method in the field of PBT production, can solve the problems of color value deterioration, PBT production equipment gap and other problems, to save manufacturing costs, extend the The effect of the cleaning cycle

Active Publication Date: 2012-11-07
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, the reason that product color value becomes worse in the prior art has bigger difference with the present invention, and the related reaction device also has significant gap with the PBT production device that the present invention relates to

Method used

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  • Product color value control method for continuous production of PBT (polybutylece terephthalate) by PTA (pure terephthalic acid)
  • Product color value control method for continuous production of PBT (polybutylece terephthalate) by PTA (pure terephthalic acid)
  • Product color value control method for continuous production of PBT (polybutylece terephthalate) by PTA (pure terephthalic acid)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The production load is 30 tons / day, and the product b value is close to 5.5. After mixing evenly with BDO, the bluetox agent and BDO are added to the slurry preparation tank 4 at a content of about 1.6ppm. BDO and terephthalic acid are prepared into a slurry at a ratio of 1.5:1, and then enter the esterification tank 5 after mixing. The polymerization catalyst tetrabutyl titanate is added into the esterification kettle 5 at a certain concentration, the esterification reaction temperature is about 255°C, and the pressure is controlled at about 200kPa. After the esterification reaction, the material enters the pre-condensation reaction kettle 6 for polycondensation reaction, the temperature is controlled at about 250°C, and the reaction pressure is controlled at about 10kPa; Around 500Pa. After the final polycondensation reaction is completed, the material is transported to the granulation equipment 8, and the PBT product is obtained after granulation. The L value measu...

Embodiment 2

[0030] The production load is 60 tons / day, and the product b value is close to 5.5. After mixing evenly with BDO, the bluetox agent and BDO are added to the slurry preparation tank 4 at a content of about 1.76ppm. BDO and terephthalic acid are prepared into a slurry at a ratio of 1.5:1, and then enter the esterification tank 5 after mixing. The polymerization catalyst tetrabutyl titanate is added into the esterification kettle 5 at a certain concentration, the esterification reaction temperature is about 260°C, and the pressure is controlled at about 200kPa. After the esterification reaction, the material enters the pre-condensation reaction kettle 6 for polycondensation reaction, the temperature is controlled at about 250°C, and the reaction pressure is controlled at about 10kPa; Around 300Pa. After the final polycondensation reaction is completed, the material is transported to the granulation equipment 8, and the PBT product is obtained after granulation. The L value meas...

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Abstract

The invention provides a product color value control method for continuous production of PBT (polybutylece terephthalate) by PTA (pure terephthalic acid). The product color value control method for continuous production of PBT by PTA includes the steps of proportionally preparing 1, 4-butanediol and terephthalic acid in a slurry preparation tank to obtain slurry, adding the well mixed slurry and catalyst into an esterification kettle, allowing for reaction at 200-270 DEG C under the reaction pressure of 10-500 kPa, allowing reacted materials to enter a prepolymerization reactor at 200-260 DEG C under the reaction pressure of 100pa-20kPa, allowing the reacted materials to enter a final polycondensation reactor at 200-260 DEG C under the pressure of 10Pa-1000Pa, and pelletizing material finishing final polycondensation to obtain finished PBT. The method is characterized in that bluing agent and 1, 4-butanediol are mixed well in an additive preparation tank, content of the bluing agent is determined according to product color value control, and the bluing agent and BDO (butanediol) are mixed and added into the slurry preparation tank, the esterification kettle or the prepolymerization reactor. By the method, product color value, especially value b, can be controlled effectively, product quality is improved, cleaning cycle of devices is prolonged, and product producing cost is lowered.

Description

technical field [0001] The invention relates to the production and processing of PBT (polybutylene terephthalate), in particular to a method for controlling the color value of a product in the process of PBT continuous PTA production, and belongs to the technical field of chemical production. Background technique [0002] Industrially, PTA (terephthalic acid) continuous production of PBT has always used titanium-based catalysts. Due to the hydrolysis phenomenon of titanium-based catalysts, for example, tetrabutyl titanate undergoes hydrolysis reaction with water to generate titanium dioxide and n-butanol. The reaction equation as follows: [0003] Ti(OC 4 h 9 ) 4 +2H 2 O→TiO 2 +4C 4 h 9 Oh [0004] The titanium dioxide particles generated by the reaction are easily adsorbed on the inner wall of the reaction kettle, and then adhere to the esterification to form scaling, and after long-term high-temperature baking, carbon black particles are formed. After 5-6 months o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D11/02
Inventor 李仁海马健黄娟
Owner CHINA PETROCHEMICAL CORP