A method of selectively removing impurities from a scandium-containing feed solution includes contacting an aqueous scandium-containing solution with an organic solvent stream containing an extractant, thereby forming a loaded organic solvent stream containing the impurity or impurities while leaving the scandium in the raffinate. The aqueous stream containing the scandium is washed, diluted and has inorganic salts added before being contacted with a second organic solvent stream to extract the scandium selectively, and followed by stripping the scandium from the scandium-containing loaded organic extractant stream by adding oxalic acid to the loaded organic extractant stream to form scandium oxalate.

Provided is a method for recovering scandium, with which it is possible to easily and efficiently recover high-purity scandium from nickel oxide ores. This method for recovering scandium involves passing a solution containing scandium through an ion exchange resin, then subjecting the eluant eluted from the ion exchange resin to solvent extraction and separating the extraction residual liquid and the extraction agent after extraction, then performing an oxalation process on the extraction residual liquid to obtain a scandium oxalate precipitate, and roasting the precipitate to obtain scandium oxide, wherein the method is characterized in that an amine-based extraction agent is used as the extraction agent for solvent extraction.

Provided is a method for recovering scandium, with which it is possible to easily and efficiently recover high-purity scandium from nickel oxide ores. This method for recovering scandium involves passing a solution containing scandium through an ion exchange resin, then subjecting the eluant eluted from the ion exchange resin to solvent extraction and separating the extraction residual liquid and the extraction agent after extraction, then performing an oxalation process on the extraction residual liquid to obtain a scandium oxalate precipitate, and roasting the precipitate to obtain scandium oxide, wherein the method is characterized in that an amine-based extraction agent is used as the extraction agent for solvent extraction.

Processes for producing a disubstituted oxalate are disclosed. The process includes contacting a mixture of cesium salt and gamma alumina with one or more alcohols and carbon dioxide (CO.sub.2) under reaction conditions sufficient to produce a composition comprising a disubstituted oxalate.

Processes for producing a disubstituted oxalate are disclosed. The process includes contacting a mixture of cesium salt and gamma alumina with one or more alcohols and carbon dioxide (CO.sub.2) under reaction conditions sufficient to produce a composition comprising a disubstituted oxalate.

Provided herein are novel solid forms of each of four compounds: (1) heptadecan-9-yl 8-((2-hydroxyethyl)amino)octanoate (“Compound 1”), (2) heptadecan-9-yl 8-((2-hydroxyethyl)(6-oxo-6-(undecyloxy)hexyl)amino)octanoate (“Compound 2”), (3) heptadecan-9-yl 8-((2-hydroxyethyl)(8-(nonyloxy)-8-oxooctyl)amino)octanoate (“Compound 3”), and (6Z,9Z,28Z,31Z)-heptatriaconta-6,9,28,31-tetraen-19-yl 4-(dimethylamino)butanoate (“MC3”), and related compositions and methods.

Provided herein are novel solid forms of each of four compounds: (1) heptadecan-9-yl 8-((2-hydroxyethyl)amino)octanoate (“Compound 1”), (2) heptadecan-9-yl 8-((2-hydroxyethyl)(6-oxo-6-(undecyloxy)hexyl)amino)octanoate (“Compound 2”), (3) heptadecan-9-yl 8-((2-hydroxyethyl)(8-(nonyloxy)-8-oxooctyl)amino)octanoate (“Compound 3”), and (6Z,9Z,28Z,31Z)-heptatriaconta-6,9,28,31-tetraen-19-yl 4-(dimethylamino)butanoate (“MC3”), and related compositions and methods.

Various embodiments provide a zinc oxide graphene composite. A zinc oxide graphene composite includes zinc oxide crystallites and graphene. A method of forming the composite includes combining graphene and zinc oxalate to form a mixture and heating the mixture to produce the zinc oxide graphene composite.

Various embodiments provide a zinc oxide graphene composite. A zinc oxide graphene composite includes zinc oxide crystallites and graphene. A method of forming the composite includes combining graphene and zinc oxalate to form a mixture and heating the mixture to produce the zinc oxide graphene composite.

The present invention relates to solriamfetol or novel salts thereof and its process for preparation. More particularly the present invention relates to solriamfetol dibenzoyl-D-tartaric acid salt or solriamfetol di-p-toluoyl-D-tartaric acid salt and their process for preparation. Further the present invention relates to use of solriamfetol dibenzoyl-D-tartaric acid salt or solriamfetol di-p-toluoyl-D-tartaric acid salt for the preparation of solriamfetol hydrochloride.