An object of the present invention is to provide a chemical liquid purification method which makes it possible to obtain a chemical liquid having excellent defect inhibition performance. Another object of the present invention is to provide a chemical liquid. The chemical liquid purification method according to an embodiment of the present invention is a chemical liquid purification method including obtaining a chemical liquid by purifying a substance to be purified containing an organic solvent, in which a content of the stabilizer in the substance to be purified with respect to the total mass of the substance to be purified is equal to or greater than 0.1 mass ppm and less than 100 mass ppm.

An object of the present invention is to provide a chemical liquid purification method which makes it possible to obtain a chemical liquid having excellent defect inhibition performance. Another object of the present invention is to provide a chemical liquid. The chemical liquid purification method according to an embodiment of the present invention is a chemical liquid purification method including obtaining a chemical liquid by purifying a substance to be purified containing an organic solvent, in which a content of the stabilizer in the substance to be purified with respect to the total mass of the substance to be purified is equal to or greater than 0.1 mass ppm and less than 100 mass ppm.

Provided is a composition containing, as an alkane polyol, a C.sub.4-18 1,2-alkane polyol in which the degradation over time of the C.sub.4-18 1,2-alkane polyol, which has inferior chemical stability and degrades easily, is suppressed, the composition being suitable for use in a cosmetic, an inkjet ink, a fiber or a coating material such as a paint. A composition containing 1,2-alkane polyol that can be used in a cosmetic, an inkjet ink, a raw material for fibers or a coating material, the alkane polyol being a C.sub.4-18 1,2-alkane polyol, and the composition containing a radical scavenger.

Provided is a composition containing, as an alkane polyol, a C.sub.4-18 1,2-alkane polyol in which the degradation over time of the C.sub.4-18 1,2-alkane polyol, which has inferior chemical stability and degrades easily, is suppressed, the composition being suitable for use in a cosmetic, an inkjet ink, a fiber or a coating material such as a paint. A composition containing 1,2-alkane polyol that can be used in a cosmetic, an inkjet ink, a raw material for fibers or a coating material, the alkane polyol being a C.sub.4-18 1,2-alkane polyol, and the composition containing a radical scavenger.

Provided is a composition containing, as an alkane polyol, a C.sub.4-18 1,2-alkane polyol in which the degradation over time of the C.sub.4-18 1,2-alkane polyol, which has inferior chemical stability and degrades easily, is suppressed, the composition being suitable for use in a cosmetic, an inkjet ink, a fiber or a coating material such as a paint. A composition containing 1,2-alkane polyol that can be used in a cosmetic, an inkjet ink, a raw material for fibers or a coating material, the alkane polyol being a C.sub.4-18 1,2-alkane polyol, and the composition containing a radical scavenger.

A lean MEG stream having a first pH level is contacted with a CO.sub.2-rich gas stream to yield a lean MEG product having a second different and lower pH level preferably in a range of 6.5 to 7.0. The system and method can be readily incorporated into a slipstream MEG recovery package, with a source of the lean MEG stream being a MEG regeneration section of the package. The CO.sub.2-rich gas could be a vented CO.sub.2 stream from the MEG reclamation section of the package. Unlike hydrochloric and acetic acid overdosing, CO.sub.2 overdosing of the lean MEG stream does not lead to rapid acidification of the lean MEG product to be stored or injected.

A lean MEG stream having a first pH level is contacted with a CO.sub.2-rich gas stream to yield a lean MEG product having a second different and lower pH level preferably in a range of 6.5 to 7.0. The system and method can be readily incorporated into a slipstream MEG recovery package, with a source of the lean MEG stream being a MEG regeneration section of the package. The CO.sub.2-rich gas could be a vented CO.sub.2 stream from the MEG reclamation section of the package. Unlike hydrochloric and acetic acid overdosing, CO.sub.2 overdosing of the lean MEG stream does not lead to rapid acidification of the lean MEG product to be stored or injected.

A lean MEG stream having a first pH level is contacted with a CO.sub.2-rich gas stream to yield a lean MEG product having a second different and lower pH level preferably in a range of 6.5 to 7.0. The system and method can be readily incorporated into a slipstream MEG recovery package, with a source of the lean MEG stream being a MEG regeneration section of the package. The CO.sub.2-rich gas could be a vented CO.sub.2 stream from the MEG reclamation section of the package. Unlike hydrochloric and acetic acid overdosing, CO.sub.2 overdosing of the lean MEG stream does not lead to rapid acidification of the lean MEG product to be stored or injected.

In a method and a system for decolorizing and deodorizing a polyhydric alcohol according to embodiments of the present invention, a mixture liquid containing a first polyhydric alcohol obtained by a separation process is prepared. The mixture liquid is subjected to a distillation treatment to preliminarily remove substances with different colors and odors to generate a pre-treatment liquid. The pre-treatment liquid is subjected to an adsorption treatment. Through a combination of the distillation treatment and the adsorption treatment, the removing efficiency of the substances with different colors and odors can be increased.

In a method and a system for decolorizing and deodorizing a polyhydric alcohol according to embodiments of the present invention, a mixture liquid containing a first polyhydric alcohol obtained by a separation process is prepared. The mixture liquid is subjected to a distillation treatment to preliminarily remove substances with different colors and odors to generate a pre-treatment liquid. The pre-treatment liquid is subjected to an adsorption treatment. Through a combination of the distillation treatment and the adsorption treatment, the removing efficiency of the substances with different colors and odors can be increased.