Methods of purifying crude 4-hydroxyacetophenone using one or more solvents as well as products comprising or consisting of crystallized 4-hydroxyacetophenone and one, two or more solvent(s). The products may be obtained or obtainable from the methods for purifying crude 4-hydroxyacetophenone.

Methods of purifying crude 4-hydroxyacetophenone using one or more solvents as well as products comprising or consisting of crystallized 4-hydroxyacetophenone and one, two or more solvent(s). The products may be obtained or obtainable from the methods for purifying crude 4-hydroxyacetophenone.

Methods of purifying crude 4-hydroxyacetophenone using one or more solvents as well as products comprising or consisting of crystallized 4-hydroxyacetophenone and one, two or more solvent(s). The products may be obtained or obtainable from the methods for purifying crude 4-hydroxyacetophenone.

A method for purifying acetone includes contacting an initial solution with a basic ion-exchange resin at a temperature of 15 C. to 30 C., wherein the initial solution comprises acetone and acetone impurities; and removing the acetone impurities from the initial solution with the basic ion-exchange resin to produce a purified solution.

A method for purifying acetone includes contacting an initial solution with a basic ion-exchange resin at a temperature of 15 C. to 30 C., wherein the initial solution comprises acetone and acetone impurities; and removing the acetone impurities from the initial solution with the basic ion-exchange resin to produce a purified solution.

A method for purifying acetone includes contacting an initial solution with a basic ion-exchange resin at a temperature of 15 C. to 30 C., wherein the initial solution comprises acetone and acetone impurities; and removing the acetone impurities from the initial solution with the basic ion-exchange resin to produce a purified solution.

Provided is a supercritical fluid chromatography system, and components comprising such a system, including one or more of a supercritical fluid chiller, a supercritical fluid pressure-equalizing vessel, and a supercritical fluid cyclonic separator. The supercritical fluid chiller and the use of the chiller allow efficient and consistent pumping of liquid-phase gases employing off-the-shelf HPLC pumps in the supercritical chromatography system using liquid-phase gas mobile phase. The pressure equalizing vessel allows the use of off the shelf HPLC column cartridges in the supercritical chromatography system. The cyclonic separator efficiently and effectively allows for separation of sample molecules from a liquid phase or gas phase stream of a supercritical fluid.

Provided is a supercritical fluid chromatography system, and components comprising such a system, including one or more of a supercritical fluid chiller, a supercritical fluid pressure-equalizing vessel, and a supercritical fluid cyclonic separator. The supercritical fluid chiller and the use of the chiller allow efficient and consistent pumping of liquid-phase gases employing off-the-shelf HPLC pumps in the supercritical chromatography system using liquid-phase gas mobile phase. The pressure equalizing vessel allows the use of off the shelf HPLC column cartridges in the supercritical chromatography system. The cyclonic separator efficiently and effectively allows for separation of sample molecules from a liquid phase or gas phase stream of a supercritical fluid.

A method for purifying acetone includes contacting an initial solution with a basic ion-exchange resin at a temperature of 15 C. to 30 C., wherein the initial solution comprises acetone and acetone impurities; and removing the acetone impurities from the initial solution with the basic ion-exchange resin to produce a purified solution.

A method for purifying acetone includes contacting an initial solution with a basic ion-exchange resin at a temperature of 15 C. to 30 C., wherein the initial solution comprises acetone and acetone impurities; and removing the acetone impurities from the initial solution with the basic ion-exchange resin to produce a purified solution.