Equipment and method for recovering vinyl chloride monomer in the production process of polyvinyl chloride paste resin by micro-suspension method
A technology of polyvinyl chloride paste and vinyl chloride monomer, which is applied in the field of recycling vinyl chloride monomer, can solve the problems of difficult processing, no gas flow rate of degassing tower, no practical reference value and operability, etc., and achieve structural Simple, good defoaming performance
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Embodiment 1
[0077] After the polymerization reaction, the latex (48.5°C, pH9.0, 45% solid content, about 90% conversion rate of vinyl chloride) is discharged into the unloading tank 4 (15 minutes), according to the installation at the bottom of the unloading tank 4 The value displayed by the first pH meter 3 is fed into 5% dilute sulfuric acid solution 2 to adjust the pH to 4.5, and the inlet valve of the gas cabinet is opened to the gas cabinet by opening the degassing tower 9 (a single tower is used, the metal grid is 10 layers, and the layer spacing is 800mm). Enter the vinyl chloride after defoaming, control the pressure 15 to 0.03Mpa (table), open the steam heating coil steam inlet regulating valve 6, and feed steam. The steam volume is preferably at a latex temperature of 77-82°C, and the above-mentioned process conditions are maintained.
[0078] Latex samples were taken every 30 minutes for residual vinyl chloride analysis. Visually inspect the foam situation from the glass sight ...
Embodiment 2
[0087] After the polymerization reaction, the latex (49°C, PH8.6, solid content 41%, vinyl chloride conversion rate about 90%) is unloaded into the discharge tank 4, and the defoaming tower 9 is opened. The defoaming tower 9 adopts a double tower (not shown), the metal grid of each tower has 8 layers, and the layer spacing is 800mm) the inlet valve of the fume cabinet is used to feed the defoamed vinyl chloride into the gas cabinet, the control pressure is 0.03Mpa (table), and the steam heating plate is turned on Pipe steam inlet regulating valve 6, pass into steam, steam amount is advisable with latex temperature 77~82 ℃, keeps above-mentioned process condition.
[0088] Latex samples were taken every 30 minutes for residual vinyl chloride analysis. Visually inspect the foam situation from the glass sight glass 16 at the outlet of the degassing tower every 30 minutes. As in Table 1. Visually inspect the foam situation from the glass sight glass at the exit of the degassing ...
Embodiment 3
[0097] After the polymerization reaction, the latex (47°C, PH8.7, 43% solid content, about 90% conversion rate of vinyl chloride) is discharged into the discharge tank 4 (15 minutes), and the value displayed by the PH meter 3 at the bottom of the tank is Introduce 5% dilute sulfuric acid solution 2 to adjust the pH to 6.5, open the degassing tower 9 (a single tower, 10 layers of metal grids, and a layer spacing of 800mm) the inlet valve of the fume cabinet, and feed the degassed vinyl chloride into the gas cabinet , control the pressure 15 to 0.03Mpa (table), open the steam heating coil steam inlet regulating valve 6, and feed steam. The steam volume should be at a latex temperature of 77-82°C, and the above process conditions should be maintained.
[0098] Latex samples were taken every 30 minutes for residual vinyl chloride analysis. Visually inspect the foam situation from the glass sight glass 16 at the outlet of the degassing tower 9 every 30 minutes. As shown in the fol...
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Abstract
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