Depolymerization process

A technology of polymers and compounds, applied in recycling technology, plastic recycling, etc.

Inactive Publication Date: 2005-12-21
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this regard, in conventional plastic decomposition methods using only subcritical water or supercritical water, it is difficult to recover monomers or oligomers that can be reused as plastic raw materials with high yields (see Comparative Example 1 described later). )

Method used

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  • Depolymerization process

Examples

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Embodiment 1

[0041] 2 g of cured product of unsaturated polyester resin (manufactured by Showa Polymer "RIGOLAC M-580"), 10 g of pure water, and 2 g of calcium carbonate were added to the reaction tube 13, and the atmosphere in the reaction tube 13 was replaced with argon gas and sealed. The reaction tube 13 was immersed in a constant temperature tank 14 at 360° C., so that the water in the reaction tube 13 was in a subcritical state. The decomposition reaction was performed for 20 minutes while the reaction tube 13 was immersed in the thermostat 14 . Then, the reaction tube 13 was taken out from the constant temperature tank 14, immersed in the cooling tank 15, and rapidly cooled to room temperature. Although water, organic acid salts, glycols, by-products, and calcium carbonate are present in the contents of the reaction tube 13, there is no undecomposed resin at all, and the decomposition rate is approximately 100%.

[0042] After adding a sufficient amount of water to the content to d...

Embodiment 2

[0044] Except using barium carbonate 2g to replace calcium carbonate as water insoluble alkali, all the other steps are identical with embodiment 1. There was no undecomposed resin in the contents of the reaction tube 13, and the decomposition rate was approximately 100%. The results of Example 2 are shown in Table 1.

Embodiment 3

[0046] Except using calcium hydroxide 2g to replace calcium carbonate as water insoluble alkali, all the other steps are identical with embodiment 1. There was no undecomposed resin in the contents of the reaction tube 13, and the decomposition rate was approximately 100%. The results of Example 3 are shown in Table 1.

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Abstract

The present invention relates to a method for decomposing polymers into monomers or oligomers by hydrolysis using subcritical water or supercritical water. The method of the present invention is characterized in that at least a part of the polymer is a polymer containing structural units derived from organic acids in the molecular structure, and the polymer is mixed with subcritical water or supercritical water in the presence of a water-insoluble alkali. touch.

Description

technical field [0001] The invention relates to a method for decomposing polymers based on subcritical water or supercritical water, in particular to a method for decomposing plastic waste. Background technique [0002] In the past, almost all plastic waste was disposed of in landfills or incinerated, instead of being effectively used as resources. In addition, there are problems such as difficulty in securing land for burial and destabilization of the ground after burial for burial treatment. Incineration treatment has problems such as damage to the furnace, generation of harmful gas and bad smell, and discharge of carbon dioxide. [0003] In addition, Japan formulated the Container and Packaging Waste Law in Heisei 7, which legally clarified the obligation to recycle plastics, and also formulated various laws on other recycling. This increases the need for recycling and reuse of plastic products. [0004] In order to deal with these problems, a method of decomposing and...

Claims

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Application Information

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IPC IPC(8): C08J11/14
CPCY02W30/62
Inventor 日高优中川尚治卜部丰之前川哲也吉田弘之
Owner MATSUSHITA ELECTRIC WORKS LTD
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