A low-consumption and environment-friendly preparation method of chlorinated polyvinyl chloride by aqueous phase suspension method
A chlorinated polyvinyl chloride, water-phase suspension technology, applied in the field of chemical preparation, can solve the problems of inability to handle dilute hydrochloric acid as a by-product, high production cost, poor heat resistance, etc., achieve uniformity of chlorination, easy operation, Effect of increasing thermal stability
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Embodiment 1
[0042] Such as figure 1 As shown, a schematic process flow diagram of the low-consumption and environment-friendly aqueous phase suspension method for preparing chlorinated polyvinyl chloride provided by an embodiment of the present invention is shown.
[0043] The technological process of this preparation method specifically comprises:
[0044] (1) In the batching kettle, prepare the desalted water suspension of polyvinyl chloride with a solid content rate of 20 to 30wt%, carry out the batching process 1, and then move to the chlorination kettle;
[0045](2) Add initiator and dispersant to the chlorination kettle, in a nitrogen atmosphere, heat up to 70-80°C and feed chlorine gas, based on 1500Kg polyvinyl chloride, maintain the chlorine flow rate at 2-4Kg / min, 6-8 Close the tail gas valve of the chlorination kettle after minutes;
[0046] (3) Continue to heat up the chlorination kettle to 105°C, adjust the chlorine flow rate of 2 to 9Kg / min in the process, control the pres...
Embodiment 2
[0052] In a 12500L enamel chlorination kettle, add 1500Kg of polyvinyl chloride resin with a degree of polymerization of 1000 and 8500Kg of desalted water, the amount of initiator is 0.3wt% of the amount of polyvinyl chloride, that is, add 4.5Kg of diphenyl peroxide with a concentration of 75wt% Formyl, after adding 4Kg of silica sol with a concentration of 30wt%, nitrogen was introduced into the chlorination kettle, and nitrogen was blown to catch up with oxygen for 30 minutes. , close the tail gas valve of the chlorination kettle after 8 minutes of passing chlorine to chase nitrogen, control the temperature at 90-96°C, control the speed of chlorine passage at 2-5Kg / min for 120 minutes, raise the temperature to 96-100°C, and adjust the speed of chlorine passage at 3-8Kg / min min, keep it for 90 minutes, raise the temperature to 100-102°C, adjust the chlorine flow rate to 3-6Kg / min, keep it for 60 minutes, raise the temperature to 102-105°C, adjust the chlorine flow rate to 2-6K...
Embodiment 3
[0056] In a 12500L enamel chlorination kettle, add 1500Kg of polyvinyl chloride resin with a degree of polymerization of 1000 and 8500Kg of hydrogen chloride concentration of 1.2wt% hydrochloric acid analysis solution, the amount of initiator is 0.3wt% of the amount of polyvinyl chloride, that is, add 4.5Kg of concentration 75wt % of dibenzoyl peroxide, and then add 4Kg of 30wt% silica sol, feed nitrogen into the chlorination kettle, blow nitrogen to catch up with oxygen for 30 minutes, and heat the jacket to 80°C with hot water at the same time, turn off the nitrogen, and feed the flow rate Chlorine gas of 2Kg / min, close the tail gas valve of the chlorination kettle after 8 minutes of nitrogen flow, control the temperature at 90-96°C, control the speed of chlorine flow at 2-5Kg / min for 120 minutes, raise the temperature to 96-100°C, and adjust the flow rate to 96-100°C. The chlorine rate is 3-8Kg / min, keep it for 90 minutes, raise the temperature to 100-102°C, adjust the chlor...
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