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Method for recovering waste polystyrene foam plastic

A technology for waste polystyrene and waste polystyrene, which is applied in the field of recycling waste polystyrene foam plastics by solvent regeneration, can solve the problems of low recovery rate of orange oil, heat energy consumption, and high cost, and achieve safe, non-toxic, Low energy consumption and high recovery efficiency

Inactive Publication Date: 2006-03-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a long time in the distillation process, consumes a large amount of heat energy, the recovery rate of orange oil is not high, and the cost is high, and the performance of the polystyrene obtained has a certain gap with the standard grade.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Get 10ml of orange oil, dissolve 3 grams of polystyrene foam with a particle size of 0.2cm, after dissolving completely, let it stand for 3 minutes, until the solution is clarified, add 50ml of absolute ethanol to precipitate, and after complete precipitation, carry out vacuum filtration to obtain Add 50ml of absolute ethanol to the polystyrene again for secondary precipitation. After complete precipitation, carry out vacuum filtration; mix the solutions obtained by the two suction filtrations together, add 110ml of water for extraction, and the extraction time is 5 minutes. Put layering, separate and obtain orange oil, measure volume and be 9.6ml, the recovery rate of solvent orange oil is 96%, the ethanol and water mixed solution of separation gained carry out vacuum distillation, and ethanol recovery rate is 97.5% and water recovery rate is 98.6%.

Embodiment 2

[0017] Take 10ml of orange oil and dissolve 3 grams of polystyrene foam with a particle size (diameter) of 0.2cm. After it is completely dissolved, let it stand for 3 minutes until the solution is clear. Add 50ml of anhydrous methanol for precipitation. After complete precipitation, vacuum pump After filtration, the obtained polystyrene was again added with 50ml of anhydrous methanol for secondary precipitation. After complete precipitation, vacuum filtration was carried out; the solutions obtained by the two suction filtrations were mixed together, and 110ml of water was added for extraction. The extraction time was 5 Minutes, stand still to separate layers, separate and obtain orange oil, measure volume and be 9.5ml, the recovery rate of solvent orange oil is 95%, the ethanol and the water mixture of separated gained carry out vacuum distillation, the ethanol recovery rate is 98.5% water recovery The rate is 98.9%.

Embodiment 3

[0019] Take 10ml of orange oil and dissolve 3 grams of polystyrene foam with a particle size (diameter) of 0.2cm. After it is completely dissolved, let it stand for 3 minutes until the solution is clear. Add 50ml of isopropanol for precipitation. After complete precipitation, vacuum pump Filter, the polystyrene that obtains is added 50ml isopropanol again and carry out secondary precipitation, after complete precipitation, carry out vacuum suction filtration; The solution that twice suction filtration gained is mixed together, add the water of 110ml and carry out extraction, extraction time is 5 Minutes, stand still to separate layers, separate and obtain orange oil, measure volume and be 9.4ml, the recovery rate of solvent orange oil is 94%, the isopropanol and water mixed solution of separated gained carry out vacuum distillation, and ethanol recovery rate is 97.5%, The water recovery rate was 98.4%.

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Abstract

The method of recovering waste polystyrene foam plastic includes dissolving waste polystyrene foam plastic with orange oil, adding alcohols, ethers or other precipitant to precipitate polystyrene, filtering to obtain polystyrene, and final adding assistant to separate solvent from the precipitant and distillation to separate assistant from the precipitant. The recovered polystyrene reaches the performance standard and may be used in producing new polystyrene foam. The method has simple technological process, uses non-toxic solvent, and has no secondary pollution, reuse of the reagent, recovering rate up to 95 % and low cost.

Description

technical field [0001] The invention relates to a method for recovering waste polystyrene foam plastics by a solvent regeneration method. Background technique [0002] At present, with the improvement of people's living standards, more and more waste polystyrene foams are produced, and due to the low density and large volume of waste polystyrene foams, the transportation cost is too high in recycling, so waste polystyrene foam The foam has not been comprehensively recycled, which is not only a great waste of resources, but also a great pollution to the environment. CN1160728 discloses a recovery method of waste polystyrene foam, which is to directly dissolve the waste polystyrene foam in orange oil, and then separate orange oil and polystyrene by distillation. However, this method requires a long time in the distillation process, consumes a large amount of heat energy, the recovery rate of orange oil is not high, and the cost is high, and the perform...

Claims

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Application Information

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IPC IPC(8): C08J11/18C08L25/06
CPCY02W30/62
Inventor 郭学益徐刚刘海涵黄凯刘荣义
Owner CENT SOUTH UNIV
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