Heliotropin rectification method
A technology of piperonal and rectification, applied in the field of medicine and chemical industry
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[0012] Example 1:
[0013] A rectification method of piperonal, the specific steps are:
[0014] Add 500g crude piperonal (the raw material pepper ring contains 10%) and 200ml white oil into a 1000ml single-necked flask, connect to a 10cm rectification column, fractionation device, and receiving bottle;
[0015] Turn on the vacuum, measure the vacuum degree to 30Pa, begin to heat up, perform total reflux at the beginning, and start to accept the front cut after half an hour of total reflux. The acceptance temperature of the front cut is 100-150℃, higher than 150℃, and lower than 180℃ is the product piperonal , Get 445g of piperonal rectification product, the content is higher than 98%.
[0016] High vacuum system is used for distillation operation, and the vacuum degree is ≤30PA.
[0017] Use heat-conducting oil to heat up, the highest oil temperature is 250℃.
[0018] The rectification collection temperature is 100-180℃, the former fraction collection temperature is ≤150℃, and the main...
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