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Method for continuously preparing polymer and device thereof

A technology for polymers and mixtures, applied in the field of polymer preparation, can solve the problems of high solvent ratio, large heater, poor heating effect, etc., achieve high conversion rate, reduce cost, and achieve the effect of uniform distribution of residence time

Active Publication Date: 2011-06-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: the proportion of solvent used in the polymerization method is as high as 60% of the feed amount, and the reaction rate is too slow
The polymerization reaction temperature is lower than 100°C, the amount of initiator and molecular weight regulator used is relatively increased, and its residue will affect the purity of the polymer and increase the load of refining recovery
Due to the use of a large amount of solvent, the heat transfer coefficient of the heater in the devolatilization device is low and the heating effect is not good, resulting in a large heater, and the polymerization solution stays in it for a long time, which is easy to produce oligomers and seriously affects product quality.

Method used

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  • Method for continuously preparing polymer and device thereof
  • Method for continuously preparing polymer and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Before carrying out the polymerization reaction, fill each raw material storage tank and reactor with nitrogen (from the nitrogen system) for replacement, remove the oxygen in the raw material liquid and the reactor, and control the oxygen content therein below 2ppm. The composition of the mixed solution was: 61.75 kg methyl methacrylate, 3.25 kg methyl acrylate, 0.20 kg tert-butyl peroxide and 0.33 kg tert-dodecyl mercaptan. According to the formula requirements, the refined and purified methyl methacrylate and methyl acrylate, the free radical initiator di-tert-butyl peroxide and the chain transfer agent tert-dodecyl mercaptan, etc. are fed from the main raw material storage tank 1, The comonomer storage tank 2 and the solvent and / or additive storage tank 3 are transported to the fully mixed reactor 7 through the metering pumps 4, 5 and 6 located at the respective bottoms, respectively. The polymer material is fully mixed in the reactor by ribbon stirring 11, and the ...

Embodiment 2

[0039] Using the same method as in Example 1, the composition of the raw material solution: 61.75kg methyl methacrylate, 1.95kg methyl acrylate, 1.30kg styrene, 0.23kg tert-butyl peroxide and 0.26kg tert-dodecyl sulfide Alcohol (equivalent to the total amount of polymerized monomers). The polymerization temperature in the fully mixed reactor was 140°C. Until the conversion rate reaches 46.0%, the polymerization mixture is transported to the tower reactor connected in series through the gear pump. In the tower reactor, the temperature of the lower tube area is 144°C, and the temperature of the upper tube area is 148°C. When the polymerization conversion rate reaches 84.0%, the polymer mixture is transported to the devolatilization preheater by a high-viscosity gear pump for preheating, wherein the temperature is 230° C., and the devolatilized polymer is stretched and granulated. The aggregation conditions and performance test results are listed in Table 1.

Embodiment 3

[0041] Using the same method as in Example 1, the composition of the raw material solution: 59.9kg methyl methacrylate, 1.85kg methyl acrylate, 3.25kg toluene, 0.25kg tert-butyl peroxide and 0.19kg tert-dodecyl mercaptan . The polymerization temperature in the fully mixed reactor was 135°C. When the conversion rate reaches 50.9%, the polymerization mixture is transported to the tower reactor connected in series through the gear pump. In the tower reactor, the temperature of the lower tube area is 139°C, and the temperature of the upper tube area is 145°C. When the polymerization conversion rate reaches 82.3%, the polymer mixture is transported to the devolatilization preheater for preheating through a high-viscosity gear pump, wherein the temperature is 230° C., and the devolatilized polymer is stretched and granulated. The aggregation conditions and performance test results are listed in Table 1.

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Abstract

The invention relates to a method for continuously preparing a polymer and a device thereof. The device is formed by connecting at least one completely mixed reactor and at least one tower reactor in series. The method comprises: lowering the mass content of oxygen dissolved in a vinyl monomer to 1 to 3ppm; filling the vinyl monomer into the completely mixed reactor, wherein the polymerization temperature is 130 to 150 DEG C, an inert solvent of which the mass is 5 percent based on that of the vinyl monomer is added, and the conversion rate of the polymerization is continuously controlled to be 35 to 60 percent; delivering the obtained reaction mixture to the tower reactor, wherein the reaction temperature is 140 to 160 DEG C, and the final conversion rate of the polymerization is controlled to be 55 to 90 percent; and delivering the obtained polymer mixture to a flash evaporation devolatilization kettle to remove volatiles, and granulating in a granulator to form plastic molded products. In the invention, the energy consumption is low, the product performance is high, the product purity is high, the production efficiency is high, and safety and environment protection are realized.

Description

technical field [0001] The invention relates to a method and a device for preparing a polymer through bulk polymerization or solution polymerization. Especially the preparation of (meth)acrylate polymers. Background technique [0002] Bulk polymerization and solution polymerization are common methods of polymer production. The biggest feature of the bulk polymerization process is that with the increase of the conversion rate, the viscosity of the system rises sharply, which makes engineering problems such as stirring, heat transfer, and mixing very complicated. Many polymer products such as general-purpose polystyrene, high-impact polystyrene and polyester are produced by this method. Due to the high viscosity of the system in the later stage of the polymerization reaction, stirring, heat transfer and mixing are very difficult. [0003] Japanese Patent JP-B52-32665 discloses a continuous bulk polymerization method in which a fully mixed reactor is used and the polymerizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/14C08F2/02C08F2/04C08F2/01
Inventor 刘哲赵金德王硕李晶陈继新胡慧林刘长清
Owner PETROCHINA CO LTD
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