Method for producing dicarboxylic acid compound and method for producing recycled resins

JPWO2025009531A1Pending Publication Date: 2025-01-09
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Patent Information

Application Number
JP2025531560
Authority / Receiving Office
JP · JP
Patent Type
Applications
Priority Date
2023-07-03
Filing Date
2024-07-02
Publication Date
2025-01-09

AI Technical Summary

Technical Problem

Conventional methods for recycling synthetic resin waste face challenges in efficiently recovering desired resins due to similarities in metal content and coloring, limiting the types of resins that can be recovered and reused.

Method used

A method involving the crystallization of dicarboxylic acid compounds from a liquid mixture containing a dicarboxylic acid and a dihydroxy compound, followed by washing with acidic or organic solvents, to produce high-purity compounds that can be used for recycling a wider variety of synthetic resin waste.

Benefits of technology

This method enables the efficient recycling and reuse of a broader range of synthetic resin waste, improving the recovery process by selectively crystallizing dicarboxylic acid compounds and dihydroxy compounds, resulting in high-quality recycled resins.

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Abstract

The present invention addresses the problem of efficiently recycling waste resin compositions such as synthetic resins, enabling the reuse of a wider variety of resins than before.　The problem is solved by a method for producing a dicarboxylic acid compound, said method including a crystallization step for crystallizing at least the dicarboxylic acid compound from a mixed liquid containing a dicarboxylic acid compound represented by general formula (1-1) or general formula (1-2) and a dihydroxy compound represented by general formula (2-1) or general formula (2-2).　The substituents and the like in the general formulas are as described in the description of the present application.
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