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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 materials, the price is high, and the cost of producing dioctyl terephthalate is high.

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
Effect test

Embodiment 1

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

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

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

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

[0028] (4) After the reaction is finished, use a vacuum pump to evacuate, and carry out vacuum distillation on the reaction product of step (3). The t...

Embodiment 2

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

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

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

[0034] (4) After the reaction, use a vacuum pump to evacuate and carry out vacuum distillation. The temperature rises with 230°C as the cut-off point, and extracts separately: the isooctyl alcohol collected before 230°C is for later use; 230-270°C is extracted and collected What is crude dioctyl terephthalate; the eth...

Embodiment 3

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

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

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

[0040] (4) After the reaction, use a vacuum pump to evacuate and carry out vacuum distillation. The temperature rises at 230°C as the cut-off point, and extracts respectively: the isooctyl alcohol collected before 230°C is for later use; 230-270°C for extraction What is collected is crude dioctyl terephthalate; the ethylene g...

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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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