PURIFICATION METHOD OF REGENERATED POLYPROPYLENE Russian patent published in 2020 - IPC C08J11/08 B29B17/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of cleaning contaminated polymers using a solvent under pressure and solid media. Method of purifying regenerated polypropylene involves obtaining regenerated polypropylene and bringing it into contact with a liquid solvent at high temperature and pressure to obtain extracted regenerated polypropylene. Extracted regenerated polypropylene is dissolved in a solvent at high temperature and pressure to obtain a solution containing polypropylene and suspended contaminants. After settling, the solution is cleaned at high temperature and pressure by bringing into contact with the solid medium to obtain a solution containing purer polypropylene. Then purer polypropylene is separated from solution.

EFFECT: obtaining purified polypropylene substantially free from colour and odour.

15 cl, 5 dwg, 1 tbl, 4 ex