Production method of product 1,3-butylene glycol

A product 1,3-butylene glycol, wherein an area percentage of a peak of 1,3-butylene glycol in a gas chromatography analysis under the following conditions is 99.5% or more, and a weight fraction of a dinitrophenylhydrazine derivative of 6-hydroxy-2-hexanone in an HPLC analysis under the following conditions is 18.0 ppm or less,

• wherein the conditions of the gas chromatography analysis are as follows:
• analysis column:
• a column in which polyethylene glycol is used as a stationary phase (length of 30 m×inner diameter of 0.25 mm×film thickness of 0.25 μm),
• temperature rising conditions:
• a temperature is raised from 80° C. up to 230° C. at 5° C./minute and then retained at 230° C. for 10 minutes,
• sample introduction temperature:
• 250° C.,
• carrier gas:
• nitrogen,
• gas flow rate in column:
• 0.5 mL/minute,
• detector and detection temperature:
• flame ionization detector (FID) and 250° C.,
• control mode:
• constant flow
• split ratio:
• 50:1,
• sample injection condition:
• 1 μL, and
• wherein the conditions of the HPLC analysis are as follows:
• the sample preparation is as follows:
• 1000 μL of a solution of 2,4-dinitrophenylhydrazine, which is extracted by adding 5 mL of acetonitrile to a cartridge packed with spherical silica gel coated with 2,4-dinitrophenylhydrazine, and 100 μL of 0.2 mol/L hydrochloric acid are added to 0.05 g of the product 1,3-butylene glycol, and a resultant mixture is reacted at 45° C. for two hours.
• (Analysis Conditions)
• Measurement sample:
• a reaction liquid obtained by the sample preparation is diluted to 2 mL with a mobile phase that is used in HPLC, and the diluted liquid is used as a measurement sample,
• Detector:
• UV-Vis detector,
• Detection wavelength:
• 369 nm,
• Analysis column:
• a column in which palmitamidopropyl group-modified silica gel (particle diameter:
• 5 μm, inner diameter×length=4.6 mm×25 cm, pore size:
• 100 Å, surface coating level:
• 2.7 μmol/m2, surface area:
• 450 m2/g, metal impurity:
• less than 5 ppm, carbon content:
• 19.5%) is used as a stationary phase,
• Column temperature:
• 40° C.,
• Mobile phase:
• acetonitrile/distilled water=50/50 (volume ratio),
• Mobile phase flow rate:
• 0.4 mL/min,
• Sample injection amount:
• 20 μL