Abstract: The invention relates to a process for producing a terephthalate polyester from at least one feedstock of polyester to be recycled, integrating a process of depolymerization, advantageously by glycolysis, of the polyester to be recycled in order to produce a diester intermediate compatible with the specifications of the polymerization steps and comprising an optimized system for recycling the streams.

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 process for the production of a terephthalate polyester, containing a stage a) for preparing an esterification feedstock containing at least one mixing section fed with at least one terephthalic acid feedstock and one diester monomer feedstock, where the ratio of the total number of moles of diol units with respect to the total number of moles of terephthalate units introduced into the mixing section is between 1.0 and 2.0, the mixing section being operated at a temperature between 25° C. and 250° C. and at a pressure greater than or equal to 0.1 MPa, an esterification stage b) to produce at least one reaction effluent and one aqueous effluent, a polycondensation stage c) to obtain at least the terephthalate polyester and an effluent containing at least one diol monomer, and a stage d) of treatment of the diols to obtain a purified diol stream.

Abstract: The present invention relates to an NCC process and an apparatus for producing light olefins and aromatics, wherein the C5+ fraction (16) of the cracking effluent is separated into a C5 fraction (25) recycled into the NCC reactor (4) and a C6+ fraction (26), and wherein the C6+ fraction (26) is sent into an aromatics extraction unit (30) to produce an aromatics-enriched fraction (31) and a low-aromatics fraction (32).

Abstract: The invention relates to a process for depolymerizing a polyester feedstock comprising PET, said process comprising, prior to the step of depolymerization by glycolysis and to the step of purification of the depolymerization effluent, an improved step of conditioning the feedstock in which the polyester feedstock is conditioned in terms of temperature and pressure and then mixed with a diol effluent in a static or dynamic mixer in order in particular to substantially reduce the viscosity of the feedstock.

Abstract: The present invention relates to an NCC process and an apparatus for producing light olefins and aromatics, wherein the fraction comprising ethane and/or propane (12) from the cracking effluent is sent at least partly into a steam cracking furnace (19), fed with steam (20), to produce a steam cracking effluent (21) comprising ethylene and/or propylene.

Abstract: The invention relates to a process of depolymerization of a polyester feedstock comprising PET, which comprises: a) a conditioning step; b) a glycolysis step in the presence of diol; c) a step of separation of the diol, producing at least a gaseous diol effluent, at least a liquid diol effluent and a liquid monomers effluent; g) a step of separating said liquid monomers effluent into a heavy impurities effluent and a prepurified monomers effluent, this step being conducted with a residence time of less than 10 min; e) a step of decolourizing the prepurified monomers effluent, in the presence of at least one adsorbent, and f) a diol purification step, which is supplied with at least a gaseous diol effluent and at least a liquid diol effluent, which are obtained from step c), and which produces a purified diol effluent and one or more impurities effluent(s).

Abstract: The invention relates to a process for depolymerizing a polyester feedstock comprising PET, said process comprising, prior to the step of depolymerization by glycolysis and to the step of purification of the depolymerization effluent, an improved step of conditioning the feedstock in which the polyester feedstock is conditioned in terms of temperature and pressure and then mixed at least with a recycled residue effluent and a diol effluent in particular in order to substantially reduce the viscosity of the feedstock.

Abstract: A process for the production of a terephthalate polyester, containing a stage a) for preparing an esterification feedstock containing at least one mixing section fed with at least one terephthalic acid feedstock and one diester monomer feedstock, where the ratio of the total number of moles of diol units with respect to the total number of moles of terephthalate units introduced into the mixing section is between 1.0 and 2.0, the mixing section being operated at a temperature between 25° C. and 250° C. and at a pressure greater than or equal to 0.1 MPa, an esterification stage b) to produce at least one reaction effluent and one aqueous effluent, a polycondensation stage c) to obtain at least the terephthalate polyester and an effluent containing at least one diol monomer, and a stage d) of treatment of the diols to obtain a purified diol stream.

Abstract: The invention relates to a process for producing a terephthalate polyester from at least one feedstock of polyester to be recycled, integrating a process of depolymerization, advantageously by glycolysis, of the polyester to be recycled in order to produce a diester intermediate compatible with the specifications of the polymerization steps and comprising an optimized system for recycling the streams.

Abstract: The present invention relates to an NCC process and an apparatus for producing light olefins and aromatics, wherein the fraction comprising ethane and/or propane (12) from the cracking effluent is sent at least partly into a steam cracking furnace (19), fed with steam (20), to produce a steam cracking effluent (21) comprising ethylene and/or propylene.

Abstract: The present invention relates to an NCC process and an apparatus for producing light olefins and aromatics, wherein the C5+ fraction (16) of the cracking effluent is separated into a C5 fraction (25) recycled into the NCC reactor (4) and a C6+ fraction (26), and wherein the C6+ fraction (26) is sent into an aromatics extraction unit (30) to produce an aromatics-enriched fraction (31) and a low-aromatics fraction (32).

Abstract: The invention relates to a process for producing butadiene from an ethanol feedstock comprising a step of converting ethanol into butadiene, a step of separating the reactants into a hydrated butadiene effluent, an impurities effluent and an ethanol-butadiene effluent, a separation step that separates the ethanol-butadiene effluent into a butadiene distillate and a contaminated reactants effluent, a step of purifying the butadiene by extractive distillation and an effluent treatment step.

Abstract: A subject-matter of the invention is a process for the depolymerization of a polyester feedstock comprising opaque PET, the said process comprising at least the stages of conditioning, of depolymerization and of separation of the diol and of separation of the liquid effluent rich in monomers, followed by a decolouration stage.

Abstract: The invention relates to a process for producing butadiene from an ethanol feedstock, comprising a step of converting the ethanol into butadiene, a distillation step, a step of washing with water, a butadiene purification step comprising at least one section for separating the 1-butene by extractive distillation and a final distillation section fed with the topped butadiene distillate, separating at the top a purified butadiene effluent and at the bottom a butene residue, and an effluent treatment step.

Abstract: The invention relates to a thermally-integrated method for producing butadiene from butanol that comprises at least the following steps: a) Dehydration of butanol, fed by a dehydration feed that is formed from at least said n-butanol feedstock that is diluted with at least a portion of the purified water effluent that is obtained from step c), leading to a butene effluent in at least one reactor, in the presence of a catalyst that comprises an alumina, b) Oxidizing dehydrogenation of said butene effluent, diluted with at least a portion of the purified water effluent that is obtained from step c), into butadiene, with said butene effluent not having undergone any treatment following the dehydration step a), c) Separation of the effluent that is obtained from step b) into at least one butadiene effluent and one purified water effluent.

Abstract: The invention relates to a process for producing butadiene from an ethanol feedstock comprising a step of converting ethanol into butadiene, a step of separating the reactants into a hydrated butadiene effluent, an impurities effluent and an ethanol-butadiene effluent, a separation step that separates the ethanol-butadiene effluent into a butadiene distillate and a contaminated reactants effluent, a step of purifying the butadiene by extractive distillation and an effluent treatment step.

Abstract: The invention relates to a process for producing butadiene from an ethanol feedstock, comprising a step of converting the ethanol into butadiene, a distillation step, a step of washing with water, a butadiene purification step comprising at least one section for separating the 1-butene by extractive distillation and a final distillation section fed with the topped butadiene distillate, separating at the top a purified butadiene effluent and at the bottom a butene residue, and an effluent treatment step.

Abstract: A subject-matter of the invention is a process for the depolymerization of a polyester feedstock comprising opaque PET, the said process comprising at least the stages of conditioning, of depolymerization and of separation of the diol and of separation of the liquid effluent rich in monomers, followed by a decolouration stage.

Abstract: The invention relates to a thermally-integrated method for producing butadiene from butanol that comprises at least the following steps: a) Dehydration of butanol, fed by a dehydration feed that is formed from at least said n-butanol feedstock that is diluted with at least a portion of the purified water effluent that is obtained from step c), leading to a butene effluent in at least one reactor, in the presence of a catalyst that comprises an alumina, b) Oxidizing dehydrogenation of said butene effluent, diluted with at least a portion of the purified water effluent that is obtained from step c), into butadiene, with said butene effluent not having undergone any treatment following the dehydration step a), c) Separation of the effluent that is obtained from step b) into at least one butadiene effluent and one purified water effluent.