Method for removing inorganic salts from halogenated polymer solution and method for halogenating polymer
A halogenated polymer and solution technology, applied in the fields of removing inorganic salts in halogenated polymer solutions and halogenating polymers, can solve the problem of high cost
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Embodiment 1
[0073] 5000 g of butyl rubber having an unsaturation of 1.70 mol% (number average molecular weight: 200,000) was dissolved in 45000 g of hexane to obtain a 10% by weight butyl rubber solution, which was heated to 40°C. With the flow rate of 10000g / h, the gained butyl rubber solution is added in the reactor A through the pipeline 1, and liquid bromine is added in the reactor A through the pipeline 2 with the flow rate of 48g / h simultaneously, stirs and makes it react for 5 minutes. The resulting bromobutyl rubber solution containing hydrogen bromide was added to mixer B through line 3, and at the same time, sodium hydroxide solution with a concentration of 50 mmol / L was added to mixer B through line 4 with a flow rate of 6700 g / h. Stir at 500 rpm. The resulting mixed system of bromobutyl rubber solution and aqueous solution was fed into the centrifuge C through the pipeline 5, and it was centrifuged at a speed of 5000 rpm. The aqueous solution was withdrawn from centrifuge C t...
Embodiment 2
[0075] Repeat Example 1, except that a sodium hydroxide solution with a concentration of 0.15 mol / L is added to the mixer B, the flow rate is 1600 g / h, and the stirring speed during neutralization is 300 rpm.
[0076] Finally, 5000 g of bromobutyl rubber was obtained.
[0077] The test results of the pH value of the aqueous solution, the water content of the bromobutyl rubber solution and the sodium content of the bromobutyl rubber are shown in Table 1.
Embodiment 3
[0079] Repeat Example 1, the difference is that the concentration of the butyl rubber solution is 15% by weight, and the flow rate of liquid bromine is 72.6g / h; the sodium hydroxide solution with a concentration of 0.12mol / L is added in the mixer B, and the flow rate is 3000g / h, the stirring speed during neutralization is 400rpm.
[0080] Finally, 5000 g of bromobutyl rubber was obtained.
[0081] The test results of the pH value of the aqueous solution, the water content of the bromobutyl rubber solution and the sodium content of the bromobutyl rubber are shown in Table 1.
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