1,3-butylene glycol product and method for producing 1,3-butylene glycol

A method for producing 1,3-butylene glycol to yield purified 1,3-butylene glycol from a reaction crude liquid including 1,3-butylene glycol,

• the method comprising:
• performing dehydration including removing water by distillation, removing a high boiling point component including removing a high boiling point component by distillation, and performing product distillation to yield purified 1,3-butylene glycol,
• wherein, in a product column for use in the performing product distillation, a 1,3-butylene glycol charged liquid is subjected to distillation under a condition that a reflux ratio is 0.3 or greater, the 1,3-butylene glycol charged liquid having a content of acetaldehyde of 500 ppm or less, a content of crotonaldehyde of 200 ppm or less, a content of water of 0.7 wt. % or less, and a concentration of 1,3-butylene glycol of 97.6 area % or greater, according to a gas chromatographic analysis performed under conditions, and the conditions for the gas chromatographic analysis are as follows:
• Analytical Column:
• a column with dimethylpolysiloxane as a stationary phase, having a length of 30 m, an inner diameter of 0.25 mm, and a film thickness of 1.0 μm
• Heating conditions:
• heating from 80° C. to 120° C. at 5° C./min, then heating again to 160° C. at 2° C./min and maintaining for 2 minutes, and further heating to 230° C. at 10° C./min and maintaining at 230° C. for 18 minutes
• Sample Introduction Temperature:
• 250° C.
• Carrier Gas:
• helium
• Column Gas Flow Rate:
• 1 mL/min
• Detector and Detection Temperature:
• a flame ionization detector (FID), 280° C.

A method for producing 1,3-butylene glycol to yield purified 1,3-butylene glycol from a reaction crude liquid including 1,3-butylene glycol,

• the method comprising:
• performing dehydration including removing water by distillation and removing a high boiling point component including removing a high boiling point component by distillation,
• wherein, in a high boiling point component removal column for use in the removing a high boiling point component, a 1,3-butylene glycol-containing charged liquid is subjected to distillation under a condition that a reflux ratio is 0.03 or greater, the 1,3-butylene glycol-containing charged liquid having a content of acetaldehyde of 500 ppm or less, a content of crotonaldehyde of 200 ppm or less, a content of water of 3 wt. % or less, and a concentration of 1,3-butylene glycol of 96.7 area % or greater, according to a gas chromatographic analysis performed under conditions, and the conditions for the gas chromatographic analysis are as follows:
• Analytical Column:
• a column with dimethylpolysiloxane as a stationary phase, having a length of 30 m, an inner diameter of 0.25 mm, and a film thickness of 1.0 μm
• Heating conditions:
• heating from 80° C. to 120° C. at 5° C./min, then heating again to 160° C. at 2° C./min and maintaining for 2 minutes, and further heating to 230° C. at 10° C./min and maintaining at 230° C. for 18 minutes
• Sample Introduction Temperature:
• 250° C.
• Carrier Gas:
• helium
• Column Gas Flow Rate:
• 1 mL/min
• Detector and Detection Temperature:
• a flame ionization detector (FID), 280° C.