The present disclosure relates to a method for upgrading liquefied waste plastics, the method including a step (A) of providing liquefied waste plastics (LWP) material, optionally a step (B) of pre-treating at least part of the liquefied waste plastics (LWP) material to produce a pre-treated liquefied waste plastics (LWP) material, a step (C) of blending the liquefied waste plastics (LWP) material and/or the pre-treated liquefied waste plastics (LWP) material with a highly paraffinic material to obtain a cracker feed such that the cracker feed meets the requirements for chlorine content and olefins content of the steam cracker, and a step (D) of steam cracking the cracker feed in a steam cracker to obtain a cracker product.

The present disclosure relates to a monomer composition for synthesizing recycled plastic which is extremely reduced in the content of organic impurities such as formic acid and acetic acid while recovering from a (co)polymer synthesized from monomers containing terephthalic acid, a method for preparing the same, and a recycled plastic, molded product, and plasticizer composition using the same.

A new and improved process can be used for depolymerization of polyurethanes with a strong inorganic base. Polyether polyols and polyamines can be recovered in high yields.

A new and improved process can be used for depolymerization of polyurethanes with a strong inorganic base. Polyether polyols and polyamines can be recovered in high yields.

A method for producing bisphenol A (BPA) is provided. The method includes step A of degrading a polycarbonate resin in a solvent and distilling off the solvent to obtain a crude solution A; step B of subjecting acetone and phenol to dehydration condensation; step C of distilling off unreacted acetone and water to obtain a concentrated liquid C; step D of crystallizing the concentrated liquid C to obtain a slurry liquid, from which a mother liquor D is obtained; step H of obtaining a solution H1 or a solution H2 from the crude solution A and part of the mother liquor D; and step I of supplying the solution H1 or H2 to the step B or C. The solution H1 contains BPA obtained by degrading BPA contained in the crude solution A and the mother liquor D into phenol and isopropenylphenol and then rebonding phenol and isopropenylphenol, and the solution H2 contains phenol obtained by degrading BPA contained in the crude solution A and the mother liquor D into phenol and acetone.

Disclosed is a recycling apparatus for a cross-linked polyethylene resin using a twin screw extruder. The recycling apparatus for a cross-linked polyethylene resin using a twin screw extruder according to an embodiment of the present disclosure includes: a raw material supply unit configured to supply a raw material that is a cross-linked polyethylene resin; and a twin screw extruder configured to receive the raw material from the raw material supply unit, the twin screw extruder including a cylinder and a twin screw installed inside the cylinder to rotate in the same direction, the twin screw extruder being configured to de-crosslink and recycle the raw material under a de-crosslinking reaction temperature and reaction pressure atmosphere while continuously transporting the raw material along the twin screw by the rotation of the twin screw.

Disclosed is a recycling apparatus for a cross-linked polyethylene resin using a twin screw extruder. The recycling apparatus for a cross-linked polyethylene resin using a twin screw extruder according to an embodiment of the present disclosure includes: a raw material supply unit configured to supply a raw material that is a cross-linked polyethylene resin; and a twin screw extruder configured to receive the raw material from the raw material supply unit, the twin screw extruder including a cylinder and a twin screw installed inside the cylinder to rotate in the same direction, the twin screw extruder being configured to de-crosslink and recycle the raw material under a de-crosslinking reaction temperature and reaction pressure atmosphere while continuously transporting the raw material along the twin screw by the rotation of the twin screw.

A doubly degradable polymer composition may include one or more aliphatic polyesters and one or more imine functional groups. The imine functional groups may be incorporated into the aliphatic polyester backbone. A method of preparing a doubly degradable polymer composition may include polymerizing one or more lactone monomers to form a polylactone polymer and reacting the polylactone polymer with a bis-imine compound to incorporate one or more imine functional groups into the polylactone polymer backbone. A method of degrading a doubly degradable polymer composition may include providing a doubly degradable polymer composition including one or more ester functional groups and one or more imine functional groups and exposing the doubly degradable polymer composition to at least one of water, an elevated temperature, and soil, thereby hydrolyzing at least one cleavable covalent bond to produce an aldehyde and an amine.

A doubly degradable polymer composition may include one or more aliphatic polyesters and one or more imine functional groups. The imine functional groups may be incorporated into the aliphatic polyester backbone. A method of preparing a doubly degradable polymer composition may include polymerizing one or more lactone monomers to form a polylactone polymer and reacting the polylactone polymer with a bis-imine compound to incorporate one or more imine functional groups into the polylactone polymer backbone. A method of degrading a doubly degradable polymer composition may include providing a doubly degradable polymer composition including one or more ester functional groups and one or more imine functional groups and exposing the doubly degradable polymer composition to at least one of water, an elevated temperature, and soil, thereby hydrolyzing at least one cleavable covalent bond to produce an aldehyde and an amine.

The present invention relates to processes for degrading plastic products and the uses thereof. The processes of the invention particularly comprise a step of amorphizing a plastic product prior to a step of depolymerization. The processes of the invention are particularly useful for degrading a plastic product comprising polyethylene terephthalate and/or polylactic acid. The invention also relates to a method of producing monomers and/or oligomers from a plastic product comprising at least one polyester, particularly polyethylene terephthalate and/or polylactic acid, comprising submitting the plastic product both to an amorphization step and to a depolymerization step.