Production method for preparing dioctyl terephthalate by virtue of alcoholysis and esterification of polyester wastes

A technology of dioctyl terephthalate and its production method is applied in the field of alcoholysis and esterification of polyester waste to prepare dioctyl terephthalate, which can solve the problems of high price and high cost, and achieve high price, high production cost, The effect of complete response

Inactive Publication Date: 2015-04-29
SHANDONG TONGYUAN ENVIRONMENTAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since terephthalic acid and dimethyl terephthalate are genuine chemical raw mater

Method used

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  • Production method for preparing dioctyl terephthalate by virtue of alcoholysis and esterification of polyester wastes
  • Production method for preparing dioctyl terephthalate by virtue of alcoholysis and esterification of polyester wastes
  • Production method for preparing dioctyl terephthalate by virtue of alcoholysis and esterification of polyester wastes

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0023] Example 1:

[0024] A production method for preparing dioctyl terephthalate by alcoholysis and esterification of polyester waste, comprising the following steps:

[0025] (1) Rinse the polyester waste with water, put it into an oven with a temperature of 100-110 ° C for drying for 1 hour; pulverize the dried polyester waste into powder with a pulverizer;

[0026] (2) Accurately weigh 400 g of polyester waste powder and 680 g of isooctyl alcohol in step (1), add them into a 2000 mL high temperature and high pressure reactor, add 1.08 g of zinc acetate and zinc oxide composite catalyst, and heat up to 180 ° C for alcoholysis reaction for 1 h ;

[0027] (3) After the alcoholysis reaction, the temperature was lowered to 135°C, 1.08 g of tetraisopropyl titanate was added, and the temperature was raised to 220°C to carry out the esterification reaction for 20h;

[0028] (4) adopt vacuum pump vacuum after the reaction finishes, carry out vacuum distillation to the reaction p...

Example Embodiment

[0030] Example 2:

[0031] (1) Rinse the polyester waste with water, put it into an oven with a temperature of 100-110 ° C for drying for 1 hour, and pulverize the dried polyester waste into powder with a pulverizer;

[0032] (2) Accurately weigh 400g of polyester powder and 720g of isooctyl alcohol into a 2000mL high-temperature and high-pressure reaction kettle, add 1.12g of zinc acetate-zinc oxide composite catalyst, and heat up to 185°C for alcoholysis reaction for 2h;

[0033] (3) After the alcoholysis reaction was completed, the temperature was lowered to 145°C, 1.12 g of tetraisopropyl titanate was added, the temperature was raised to 230°C, and the esterification reaction was carried out for 24h;

[0034] (4) use vacuum pump to vacuumize after the reaction, carry out vacuum distillation, the temperature rise takes 230 ℃ as the boundary point, extract respectively: the isooctanol collected before 230 ℃ is for later use; 230-270 ℃ is extracted and collected is crude dio...

Example Embodiment

[0036] Example 3:

[0037] (1) Rinse the polyester waste with water, put it into an oven with a temperature of 100-110 ° C for drying for 1 hour, and pulverize the dried polyester waste into powder with a pulverizer;

[0038] (2) Accurately weigh 400 g of polyester powder and 700 g of isooctyl alcohol into a 2000 mL high-temperature and high-pressure reaction kettle, add 1.1 g of zinc acetate-zinc oxide composite catalyst, and heat up to 182 ° C for alcoholysis reaction for 1.5 h;

[0039] (3) After the alcoholysis reaction is completed, the temperature is lowered to 140°C, 1.1 g of tetraisopropyl titanate is added, the temperature is raised to 225°C, and the esterification reaction is carried out for 22h;

[0040] (4) use vacuum pump to vacuumize after the reaction, carry out vacuum distillation, and the temperature rise takes 230 ℃ as the boundary point, and extract respectively: the isooctanol collected before 230 ℃ is for later use; 230-270 ℃ extraction What is collected ...

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Abstract

The invention relates to the technical field of recycling of polyester wastes and particularly relates to a production method for preparing dioctyl terephthalate by virtue of alcoholysis and esterification of polyester wastes. The production method comprises the following steps: (1) thoroughly rinsing the polyester wastes, drying and grinding; (2) adding the polyester waste powder and isooctanol at a mass ratio of 1:(1.7-1.8) into a reaction kettle, adding a zinc acetate-zinc oxide complex catalyst, heating to 180-185 DEG C and carrying out alcoholysis for 1-2 hours; (3) cooling and adding a tetraisopropyltitanate esterification-type catalyst, heating to 220-230 DEG C and carrying out esterification reaction for 20-24 hours; (4) vacuuming the above reaction product and distilling to separate isooctanol from crude dioctyl terephthalate; and (5) recovering the isooctanol obtained by separation for further use, neutralizing crude dioctyl terephthalate, washing with water, carrying out vacuum stripping dehydration, adsorbing and filtering to obtain the dioctyl terephthalate finished product. The method is simple in process, the production cost is reduced, the accumulation of polyester wastes is reduced and the method has good economic and social benefits.

Description

(1) Technical field [0001] The invention relates to the technical field of polyester waste recycling and reuse, in particular to a production method for preparing dioctyl terephthalate through alcoholysis and esterification of polyester waste. (2) Background technology [0002] Polyester is widely used in textiles, chemical fibers, fibers, films, beverage bottles, resins and other fields due to its own properties. With the extensive application of polyester in daily life, it is accompanied by the passage of time. In the long term, a large number of supplies will become waste, and it will take more than 60-70 years to rely on natural degradation. Burning them will cause huge pollution to the environment. pollute. The production of dioctyl terephthalate from polyester waste and isooctyl alcohol can not only improve the utilization rate of polyester waste and turn waste into treasure, but also increase the economic benefits of enterprises and achieve double profit, which is co...

Claims

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Application Information

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IPC IPC(8): C07C69/82C07C67/03
CPCC07C67/03B01J31/26B01J2231/49C07C67/297C07C67/48C07C67/54C07C67/56
Inventor 颜飞于学书
Owner SHANDONG TONGYUAN ENVIRONMENTAL MATERIAL CO LTD
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