Weekly Topic: What are the functions of adding deionized water in suspension polymerization production? A reward of 5 to 20 wealth for participating in the discussion
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In PVC suspension polymerization, the monomer and deionized water are used in certain proportions; it can be said that deionized water plays a very important role in the polymerization process. Please discuss: What are the functions of adding deionized water in suspension polymerization?
1. Used as a dispersion medium to suspend VCM droplets in it； 2. Dissolve the dispersant ； 3. Heat transfer medium ； 4. Reduce the viscosity of the PVC slurry to facilitate the mixing and transportation of the slurry after polymerization.
Using a solvent to accelerate the reaction and enhance heat and mass transfer
Answer: 1. Used as a dispersion medium to suspend VCM droplets in it； 2. Dissolve the dispersant ； 3. Heat transfer medium. Furthermore, during the polymerization reaction, the viscosity of the material inside the reactor increases due to volume contraction, which results in a decrease in the heat transfer coefficient K. An increase in the viscosity of the material leads to an increase in the stirring current. If there is insufficient replenishment of deionized water during the reaction process, the volume of the material decreases, which reduces the effective heat exchange area inside the reactor. As a result, it becomes difficult to remove the heat generated in the later stages of polymerization; sometimes this leads to a sharp increase in the amount of cooling water required, making temperature control difficult, and even causing explosive polymerization. Furthermore, volume contraction increases the gas phase space, exacerbating the fouling caused by gas-phase polymerization.
Used as a dispersion medium to suspend VCM droplets in it
(1) Used as a dispersion medium to suspend VCM droplets in it; (2) To dissolve dispersants; (3) As a heat transfer medium; (4) To reduce the viscosity of the PVC slurry, thereby facilitating mixing and the transportation of the slurry after polymerization.
(1) Used as a dispersion medium to suspend VCM droplets in it; (2) To dissolve dispersants; (3) As a heat transfer medium; (4) To reduce the viscosity of the PVC slurry, thereby facilitating mixing and the transportation of the slurry after polymerization.
(1) Used as a dispersion medium to suspend VCM droplets in it; (2) To dissolve dispersants; (3) As a heat transfer medium; (4) To reduce the viscosity of the PVC slurry, thereby facilitating mixing and the transportation of the slurry after polymerization.
1. Used as a dispersion medium to suspend VCM droplets in it. 2. To dissolve dispersants. 3. As a heat transfer medium. 4. To reduce the viscosity of the PVC slurry, thereby facilitating mixing and the transportation of the slurry after polymerization.
1. Used as a dispersion medium to suspend VCM droplets in it； 2. Dissolve the dispersant ； 3. Heat transfer medium. Furthermore, during the polymerization reaction, the viscosity of the material inside the reactor increases due to volume contraction, which results in a decrease in the heat transfer coefficient K. An increase in the viscosity of the material leads to an increase in the stirring current. If there is insufficient replenishment of deionized water during the reaction process, the volume of the material decreases, which reduces the effective heat exchange area inside the reactor. As a result, it becomes difficult to remove the heat generated in the later stages of polymerization; sometimes this leads to a sharp increase in the amount of cooling water required, making temperature control difficult, and even causing explosive polymerization. Furthermore, volume contraction increases the gas phase space, exacerbating the fouling caused by gas-phase polymerization.