Was synthesized in the control ①: After completion of the dropwise addition, maintaining the temperature 70 ~ 72 ℃ reaction and, at 10H, hour sampling time tracking and detection of residual 1,4-butane sultone to ≤0.1%.
Centrally controlled synthetic liquid (1): After the completion of the drip plus, maintain the temperature 70 to 72 degrees C reaction, at 10h, once per hour sampling test 1,4-butane sulfonlast residue to 0.1%.
Central control synthetic liquid ①: after dripping, keep the temperature of 70-72 ℃ for reaction, and take samples every hour for tracking detection of 1,4-butanesulfonolactone residue to ≤ 0.1% at 10h.<br>