Abstract: The invention relates to a composition predominantly comprising BHET and exhibiting a nitrogen content of less than or equal to 10 ppm by weight, the nitrogen content being determined according to a chemiluminescence method, with a stream of ozone at 35 cm3/min, after oxidative combustion of a sample in liquid form, prepared by diluting the composition in tetrahydrofuran, at a temperature of 1050-1100° C. and in the presence of an oxidizing mixture composed of oxygen and helium, and using a calibration curve made using a standard of diphenylamine diluted in toluene.

Abstract: The present invention relates to a process for the production of a polyester, comprising: a) a stage of esterification of a mixture comprising a monomer A of formula 1 and a monomer B of formula 2 or a monomer A of formula 1, a monomer B of formula 2 and isophthalic acid, in which R1 is chosen from the group consisting of: —(CH2)n—, with n an integer of between 2 and 4, —(CH2—CHR2)—, with R2 chosen from linear or branched alkyl groups comprising between 1 and 6 carbon atoms (C1-C6) and a phenyl group, then b) a stage of polycondensation.

Abstract: A method for producing a decolorized polyester according to the present invention includes: a step of preparing a polyester colored with a colorant, and a decolorizing agent containing a glycol ether-type compound having a boiling point at atmospheric pressure of 160° C. or higher; and a step of removing the colorant, by bringing the decolorizing agent into contact at least once with the colored polyester while heating the decolorizing agent to a temperature equal to or lower than a melting point of the polyester, to thereby obtain the decolorized polyester.

Abstract: A method for producing a decolorized polyester according to the present invention includes: a step of preparing a polyester colored with a colorant, and a decolorizing agent containing a glycol ether-type compound having a boiling point at atmospheric pressure of 160° C. or higher; and a step of removing the colorant, by bringing the decolorizing agent into contact at least once with the colored polyester while heating the decolorizing agent to a temperature equal to or lower than a melting point of the polyester, to thereby obtain the decolorized polyester.

Abstract: The present invention relates to a process for purifying a crude diester monomer feedstock comprising: a) a step of mixing the crude diester monomer feedstock with an aqueous solvent, at a temperature of between 60° C. and 150° C., in order to obtain a diester monomer aqueous mixture, the amount of aqueous solvent introduced being adjusted so that the crude diester monomer feedstock represents between 20% and 90% of the total weight of the diester monomer aqueous mixture; b) a step of adsorbing the diester monomer aqueous mixture, at a temperature of between 60° C. and 150° C. and a pressure of between 0.1 and 1.0 MPa, in order to obtain a purified monomer effluent.

Abstract: The invention provides a microorganism that can degrade aromatic polyester or a degradation product thereof and a method for degrading aromatic polyester or a degradation product thereof with the use of such microorganism. The microorganism is a bacterial strain that degrades aromatic polyester or a degradation product such as the strain No. 2a (Accession Number: NITE BP-03483); the strain No. 7a (Accession Number: NITE BP-03484); or the strain No. 8d (Accession Number: NITE BP-03485).

Abstract: The invention relates to a process for depolymerization of a polyester feedstock, comprising: a) conditioning of the feedstock using a means for at least partially melting the feedstock and at least one mixer, which are fed with the feedstock and a diol stream, with a ratio by weight between the diol stream and the feedstock of between 0.01 and 6.00, the volume degree of dilution with diol in each mixer being between 3% and 70%; b) depolymerization of the polyester feedstock at 150-300° C., the ratio by weight between the diol and the diester in step b) being adjusted between 0.3 and 8.0; c) optionally, the separation of the diol, at a temperature of between 60 and 250° C. and a pressure lower than that of step b).

Abstract: The present invention relates to a process for depolymerization of a polyester feedstock comprising PET, comprising: a) a step for conditioning the polyester feedstock, to produce a conditioned feedstock stream; b) a step of depolymerization of the conditioned feedstock stream, at a temperature of between 150 and 300° C., in the presence of diol with a ratio by weight between the diol and the diester in the feedstock of between 0.3 and 8.0, to produce a reaction effluent; c) a step of separation of the diol from the reaction effluent, to produce at least a liquid monomers effluent; d) a step of separation of the liquid monomers effluent into a heavy impurities effluent and a prepurified monomers effluent; and e) a step of purification of the prepurified monomers effluent, comprising a substep e1) of adsorption at a temperature of between 50 and 200° C. and a crystallization substep e2), and producing at least one decolourized purified diester monomer effluent.

Abstract: A method for producing a decolorized polyester according to the present invention includes: a step of preparing a polyester colored with a colorant, and a decolorizing agent containing a glycol ether-type compound having a boiling point at atmospheric pressure of 160° C. or higher; and a step of removing the colorant, by bringing the decolorizing agent into contact at least once with the colored polyester while heating the decolorizing agent to a temperature equal to or lower than a melting point of the polyester, to thereby obtain the decolorized polyester.