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High-shear reaction kettle and application of kettle to production of suspension polymerization polyethylene

A polyethylene oxide and suspension polymerization technology, which is applied in the field of high-shear reactors in the field of chemical engineering technology, can solve the problems of density difference between particles and fluid medium, insufficient axial movement speed, dead angle of reactor, etc., and achieve product particle size The effect of uniform, accelerated axial movement speed and large radial shear force

Active Publication Date: 2014-07-02
SHANGHAI RES INST OF CHEM IND +2
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] Conventional reactors used for the production of polyethylene oxide, when it comes to ring-opening heterogeneous suspension polymerization of ethylene oxide, due to the problem of density differences between particles and fluid media, when ensuring radial shear force, often cause axial Insufficient moving speed and dead angle in the reactor

Method used

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  • High-shear reaction kettle and application of kettle to production of suspension polymerization polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, a high-shear reactor includes a motor drive device 1, a stirring device, a kettle body, a jacket 5, and a baffle 10. The motor drive device 1 is connected to the stirring device through a transmission device 2, and the motor drive device 1 Located on the top of the kettle body, a stirring device is arranged in the kettle body. The stirring device includes a stirring shaft 8 and a paddle 6 arranged on the stirring shaft 8, and the stirring shaft 8 is connected to a motor driving device. The ratio of the diameter of the blade d to the diameter D of the kettle body d / D=0.35, the ratio of the height h (vertical height) of the blade to the diameter d of the blade is 1.0, and the 45°blade turbine type is used to push downwards, and the corresponding blade end line The speed is 5D / d (m / s). The diameter d of the blade is smaller than the diameter D of the kettle body, which can provide a larger axial fluid rising space. The single-piece baffle design...

Embodiment 2

[0032] Step 1: Same as Example 1, except that the amount of each component of the catalyst is increased by 5 times in the same proportion, the other conditions remain unchanged.

[0033] Step 2: The reactor volume is 20m 3 , Except that the amount of solvent added is changed to 10m 3 Otherwise, the other conditions are the same as in Example 1.

[0034] After reacting for 20 hours, the suspended materials in the reactor are filtered by a filter and dried in a fluidized bed. The conversion rate of ethylene oxide reaches 99.1%, and a polyethylene oxide with a molecular weight of about 420,000 is obtained. The laser particle size analysis shows the average particle size of the product. It is about 47μm, and the sieving rate of 20-mesh sieve is 99%.

Embodiment 3

[0036] Step 1: Same as Example 2, except that the added amounts of calcium metal, propylene oxide, and acetonitrile are sequentially changed to 15 kg, 21.7 kg and 6.2 kg, and other conditions remain unchanged.

[0037] Step 2: Same as Example 2, except that the shear speed is changed to 300 rpm and the amount of 90# solvent added is changed to 8 m3, the other conditions remain unchanged.

[0038] After reacting for 12 hours, the suspended materials in the reactor are filtered by a filter and dried in a fluidized bed. The conversion rate of ethylene oxide reaches 97.8%, and a polyethylene oxide with a molecular weight of about 900,000 is obtained. The laser particle size analysis shows the average particle size of the product. It is about 115μm, and the sieving rate of 20-mesh sieve is 98%.

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Abstract

The invention relates to a high-shear reaction kettle which comprises a motor driving device, a stirring device, a kettle body, a clamping sleeve and a baffle plate, wherein the motor driving device is connected with the stirring device and is positioned on the top of the kettle body, and the stirring device is arranged in the kettle body; the clamping sleeve is arranged outside the kettle body, and the baffle plate is arranged in the kettle body; a material inlet, a material outlet and a kettle-inside temperature sensor inserting hole are formed in the kettle body, and a condensing medium inlet, a condensing medium outlet and a clamping sleeve temperature sensor inserting hole are formed in the clamping sleeve. The high-shear reaction kettle is applied to the production of the suspension polymerization polyethylene. Compared with the prior art, the reaction kettle can provide great radial shearing force, so that the generation of a dead angle in the reaction kettle is avoided. The polymerization reaction kettle is adopted to produce a polymerization product, namely the polyethylene, the molecular weight distribution and the particle size distribution of the polyethylene are narrow, the particle size of the polyethylene is uniform, the quality of finished products of the polymerization product is significantly improved and the rate of finished products of the polymerization product is significantly increased.

Description

Technical field [0001] The invention belongs to a high-shear reactor in the technical field of chemical engineering, and more specifically relates to a high-shear reactor and its application in the production of suspension polymerization polyethylene oxide. Background technique [0002] Polyethylene oxide (PEO) is a multifunctional water-soluble polymer material with lubrication, high viscosity, water retention, thickening and other characteristics. It has been widely used in papermaking, building materials, water treatment, food, packaging, pharmaceuticals and daily chemicals. field. [0003] Conventional reactors used for the production of polyethylene oxide, when involved in the ring-opening heterogeneous suspension polymerization of ethylene oxide, due to the difference between the density of particulate matter and the fluid medium, the axial shear force is often Insufficient moving speed, there is a problem of dead angle in the reactor. The present invention solves the insuf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18C08G65/12
Inventor 储根初陆平晔孔猛杨维成康必显杨晴罗勇
Owner SHANGHAI RES INST OF CHEM IND
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