A method for treating fluid, notably water, includes a renewal step in order to recover the adsorption capacities of an adsorbent bed, including the extraction of a sample of adsorbent from the adsorbent bed, the determination of a target mean age of the extracted adsorbent sample, in particular by the rejuvenation of at least one portion of the extracted adsorbent sample, at which target mean age the extracted adsorbent has a real abatement of pollutants corresponding to a previously set abatement objective, the rejuvenation of the adsorbent bed to the predetermined target mean age. The method makes it possible to improve the treatment of a fluid by adsorption, and notably to take into account the new contaminants. The disclosure also relates to a plant for treatment according to the proposed method.

The present disclosure is related to processes for efficient large-scale preparation of alkylated cyclodextrins. The processes of the present disclosure provide high purity alkylated cyclodextrins with high purity and low levels of chloride while improving efficiency, increasing batch size, and reducing total process time.

A method for producing a nanocomposite sorbent comprising carbon nanotube-grafted acrylic acid/acrylamide copolymer which involves copolymerization of acrylic acid and acrylamide in the presence of an aqueous dispersion of carbon nanotubes. The method yields a nanocomposite sorbent material having a reversible adsorption capacity phenol of 5 to 2500 μg of phenol per mg of nanocomposite sorbent. Also disclosed is a method for removing organic pollutants from water using the nanocomposite sorbent.

Use of poly(alkylamine)-derived (PAD) cross-linked polymeric ammonium salts and ionomer hydrogels for adsorbing and desorbing organic contaminants, specifically per and polyfluoro alkyl substances (PFAS) from water.

A process for treating a hydrocarbon stream to remove polynuclear aromatic (PNA) and heavy polynuclear aromatic (HPNA) compounds includes contacting the hydrocarbon stream with an adsorbent in an adsorption unit to adsorb the PNA and HPNA compounds onto the adsorbent to produce a treated hydrocarbon stream and regenerating the adsorbent. Regenerating the adsorbent may include contacting the adsorbent with a solvent comprising a disulfide oil, such as a disulfide oil effluent from a mercaptan oxidation unit. The solvent comprising the disulfide oil desorbs the PNA and HPNA compounds from the adsorbent into the solvent to produce a desorption effluent. The treated hydrocarbon stream can be passed to a hydrocracking unit that hydrocracks the treated hydrocarbon stream to produce a hydrocracker effluent that includes greater value petrochemical products or intermediates.

A granular carbon nanocomposite adsorbent which has a surface active material that is suitable for adsorbing contaminants in a liquid, and a carrier material. At least a portion of the surface active material is a graphene nanomaterial. The carrier material carries the surface active material as the surface active material interacts with the contaminants. The carrier material and surface active material are formed into granules.

Reactor allowing the continuous filtration of a flowing fluid for the adsorption of pollutants on a filter, and electrolysis for regeneration of the filter and removal of organic pollutants, the reactor having a chamber, with at least one inlet delivering a fluid into the chamber and at least one outlet for evacuating the fluid from the chamber; a circuit for circulating a fluid to be treated by adsorption of pollutants on the filter; a circuit for recirculating an electrolyte solution for electrolysis, connecting the outlet to the inlet; the reactor operating in two modes; in continuous filtration mode of a fluid through the circulation circuit for adsorption of pollutants on the filter; in electrolysis mode for regeneration of the filter and removal of organic pollutants, by applying an electric current, with continuous recirculation of the electrolyte solution through the recirculation circuit.

A process for treating a hydrocarbon stream to remove polynuclear aromatic (PNA) and heavy polynuclear aromatic (HPNA) compounds includes contacting the hydrocarbon stream with an adsorbent in an adsorption unit to adsorb the PNA and HPNA compounds onto the adsorbent to produce a treated hydrocarbon stream and regenerating the adsorbent. Regenerating the adsorbent may include contacting the adsorbent with a solvent comprising a disulfide oil, such as a disulfide oil effluent from a mercaptan oxidation unit. The solvent comprising the disulfide oil desorbs the PNA and HPNA compounds from the adsorbent into the solvent to produce a desorption effluent. The treated hydrocarbon stream can be passed to a hydrocracking unit that hydrocracks the treated hydrocarbon stream to produce a hydrocracker effluent that includes greater value petrochemical products or intermediates.

A method for producing a nanocomposite sorbent comprising carbon nanotube-grafted acrylic acid/acrylamide copolymer which involves copolymerization of acrylic acid and acrylamide in the presence of an aqueous dispersion of carbon nanotubes. The method yields a nanocomposite sorbent material having a reversible adsorption capacity phenol of 5 to 2500 μg of phenol per mg of nanocomposite sorbent. Also disclosed is a method for removing organic pollutants from water using the nanocomposite sorbent.

Use of poly(alkylamine)-derived (PAD) cross-linked polymeric ammonium salts and ionomer hydrogels for adsorbing and desorbing organic contaminants, specifically per and polyfluoro alkyl substances (PFAS) from water.