The present invention relates to a process for in-situ regeneration of spent ion exchange resin catalyst used in the dimerization of olefins, etherification and alkylation processes by various impurities coming from feed streams and heavier oligomers forms as byproducts. The process involves backwashing with water which is followed by the step of naphtha washing. Naphtha washing involves filling the reactor with paraffinic naphtha and soaking the catalyst bed in naphtha. The step of naphtha washing is followed by naphtha circulation in the reactor. The last step involves treatment with diluted HCl solution wherein deposited impurities at the ion exchange sites are removed using diluted HCl. The process achieves up to 80% regeneration of spent catalysts.

The present invention relates to a process for in-situ regeneration of spent ion exchange resin catalyst used in the dimerization of olefins, etherification and alkylation processes by various impurities coming from feed streams and heavier oligomers forms as byproducts. The process involves backwashing with water which is followed by the step of naphtha washing. Naphtha washing involves filling the reactor with paraffinic naphtha and soaking the catalyst bed in naphtha. The step of naphtha washing is followed by naphtha circulation in the reactor. The last step involves treatment with diluted HCl solution wherein deposited impurities at the ion exchange sites are removed using diluted HCl. The process achieves up to 80% regeneration of spent catalysts.

The present disclosure relates to a regenerated catalyst for hydrotreating heavy oil or residue oil and a preparation method thereof. More particularly, the present disclosure relates to the regenerated catalyst having excellent mechanical properties and desulfurization performance with minimal loss of active components and the method for preparing the regenerated catalyst. The regenerated catalyst can be used in place of the fresh catalyst, is excellent in economy and can reduce the environmental burden by reusing the spent catalyst to be disposed or buried.

The present disclosure relates to a regenerated catalyst for hydrotreating heavy oil or residue oil and a preparation method thereof. More particularly, the present disclosure relates to the regenerated catalyst having excellent mechanical properties and desulfurization performance with minimal loss of active components and the method for preparing the regenerated catalyst. The regenerated catalyst can be used in place of the fresh catalyst, is excellent in economy and can reduce the environmental burden by reusing the spent catalyst to be disposed or buried.

A catalyst that is used in the catalytic pyrolysis of biomass is regenerated by oxidation and washing with a liquid to remove minerals and restore catalyst activity and selectivity to aromatics.

A catalyst that is used in the catalytic pyrolysis of biomass is regenerated by oxidation and washing with a liquid to remove minerals and restore catalyst activity and selectivity to aromatics.

A method of recovering selective catalytic reduction catalysts relates to metal-Zeolite based catalysts. A selective catalytic reduction catalyst service event where a metal-Zeolite based selective catalytic reduction catalyst of an exhaust aftertreatment system may perform below a threshold level of performance is determined. The selective catalytic reduction catalyst then exposed to a recovery fluid selected to facilitate movement of metal ions.

The invention relates to a process for separating one or more components from a mixture by a membrane separation in whichdepending on the component to be separatedan acid or a base is added to the mixture before the membrane separation.

The invention relates to a process for separating one or more components from a mixture by a membrane separation in whichdepending on the component to be separatedan acid or a base is added to the mixture before the membrane separation.

Provided are a denitration catalyst regeneration method and a denitration catalyst regeneration system, which are capable of recovering denitration performance to a high level and reducing the SO.sub.2 oxidation rate of a catalyst. A denitration catalyst regeneration method according to the present invention includes: a chemical solution cleaning step for immersing a denitration catalyst in a chemical solution containing a fluorine compound and an inorganic acid; a step for extracting the denitration catalyst from the chemical solution; and a finish washing step for washing the denitration catalyst extracted from the chemical solution with a finish cleaning solution containing an organic acid.