Method for preparing high-purity cyclopentadiene
A technology for cyclopentadiene and dicyclopentadiene is applied in the field of preparing high-purity cyclopentadiene by a liquid-phase indirect continuous depolymerization method, which can solve the problems of difficult recovery of heat-conducting oil of inert diluent, hindered equipment operation, etc. Low, easy to control, stable product quality
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Embodiment 1
[0021] First, add pure heat transfer oil and composite polymerization inhibitor with a weight ratio of 1:0.005 to the thermal decomposer 2 and rectification reboiler 6, and then pass in nitrogen to replace the air in the system, heat the heat transfer oil to 270°C, and then pass the metering The pump adds crude dicyclopentadiene (83.5% by mass) from the bottom of the thermal decomposer to the thermal decomposer, contacts with high-temperature heat transfer oil, and controls the feed rate so that it stays in the thermal decomposer for 2.0S, dicyclopentadiene Diene gasification, depolymerized cyclopentadiene enters rectification column 3 for rectification, and the high-purity cyclopentadiene separated from the top of the tower enters collector 5 through condenser 4 (preserved at low temperature), and a small amount of uncracked cyclopentadiene Dicyclopentadiene and by-products are heated in the bottom reboiler 6 and rectified again. The composite inhibitor is a compound of hydro...
Embodiment 2
[0024] First, add pure heat transfer oil and composite polymerization inhibitor with a weight ratio of 1:0.008 to the thermal decomposer 2 and rectification reboiler 6, and then pass in nitrogen to replace the air in the system, heat the heat transfer oil to 280°C, and then pass the metering The pump adds crude dicyclopentadiene (83.5% by mass) from the bottom of the thermal decomposer to the thermal decomposer, contacts with high-temperature heat transfer oil, and controls the feed rate so that it stays in the thermal decomposer for 2.0S, dicyclopentadiene Diene gasification, depolymerized cyclopentadiene enters rectification column 3 for rectification, and the high-purity cyclopentadiene separated from the top of the tower enters collector 5 through condenser 4 (preserved at low temperature), and a small amount of uncracked cyclopentadiene Dicyclopentadiene and by-products are heated in the bottom reboiler 6 and rectified again. The complex polymerization inhibitor is a comp...
Embodiment 3
[0027] First, add pure heat transfer oil and composite polymerization inhibitor with a weight ratio of 1:0.01 to the thermal decomposer 2 and rectification reboiler 6, and then pass in nitrogen to replace the air in the system, heat the heat transfer oil to 280°C, and then pass the metering The pump adds crude dicyclopentadiene (92.7% by mass) from the bottom of the thermal decomposer to the thermal decomposer, contacts with high-temperature heat transfer oil, and controls the feed rate so that it stays in the thermal decomposer for 1.5S. Diene gasification, depolymerized cyclopentadiene enters rectification column 3 for rectification, and the high-purity cyclopentadiene separated from the top of the tower enters collector 5 through condenser 4 (preserved at low temperature), and a small amount of uncracked cyclopentadiene Dicyclopentadiene and by-products are heated in the bottom reboiler 6 and rectified again. The complex polymerization inhibitor is a compound of 4-tert-buty...
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