2results about How to "Efficient decolorization" patented technology

The invention relates to the technical field of fabric recycling and reusing, in particular to a process for degrading colored waste PET fabric and recycling BHET, which comprises the following steps: S1, mixing a composite catalyst, the colored waste PET fabric and ethylene glycol, adding into a reaction kettle, heating to 150-165 DEG C, controlling the pressure in the kettle to 0-0.2 MPa, carrying out degradation reaction for 2-6 hours, and filtering to remove insoluble impurities after the degradation reaction is finished, so as to obtain a mixed solution; an alcoholysis solution is obtained; s2, decolorizing the alcoholysis solution obtained in the step S1 through a multi-stage resin tank to obtain a mixture containing ethylene glycol and a product; and S3, mixing the mixture obtained in the step S2 with deionized water, heating to 95-100 DEG C, cooling to 70-80 DEG C after the mixture is completely dissolved, continuously stirring for 1-3 hours, carrying out hot filtration to obtain filtrate A and a solid A, continuously cooling the filtrate A to-10 to-5 DEG C, stirring for 8-12 hours, filtering to obtain filtrate B and a solid B, and drying the solid B to obtain the BHET. The process disclosed by the invention is relatively good in decolorization efficiency on the colored waste PET and high in BHET yield, and meanwhile, the solvent can be efficiently recycled, so that resource waste is reduced.

The utility model relates to the technical field of chemical production, concretely relates to a cumene hydroperoxide concentration and decoloration system, including primary flash tank, the primary flash tank top has the secondary flash tank through pipeline connection, the primary flash tank bottom has the light heavy component collection jar through pipeline connection, the secondary flash tank top has the light heavy component collection jar through pipeline connection, the secondary flash tank bottom has the tertiary flash tank through pipeline connection, the tertiary flash tank top has the light heavy component collection jar through pipeline connection, the light heavy component collection jar top is connected with vacuum unit, the utility model discloses through multistage flash and vacuum low temperature operation, has realized the efficient decoloration and concentration of CHP, has given consideration to safety, environmental protection and economy, has improved the product quality of downstream ABS resin significantly, has solved the key problem that the product yellowing of chromaticity is out of limit in traditional craft.