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A High Shear Reactor and Its Application in the Production of Suspension Polyethylene Oxide

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

Active Publication Date: 2016-01-20
SHANGHAI RES INST OF CHEM IND +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • A High Shear Reactor and Its Application in the Production of Suspension Polyethylene Oxide

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 plate 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, a paddle 6 arranged on the stirring shaft 8, and the stirring shaft 8 is connected to a motor drive device. The ratio of the diameter d of the blade 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° folding blade turbine is used to push down, and the corresponding end line of the blade is The speed is 5D / d (m / s). The ratio of the blade diameter d to the tank body diameter D is small, which can provide a large axial fluid rising space. The single-piece baffle des...

Embodiment 2

[0032] Step 1: the same as in Example 1, except that the amount of each component of the catalyst is increased by 5 times in equal proportions, and the rest of the conditions are unchanged.

[0033] Step 2: The volume of the reactor is 20m 3 , except changing the amount of solvent added to 10m 3 Except, all the other conditions are with embodiment 1.

[0034] After 20 hours of reaction, the suspended material in the reactor was filtered by a filter and dried in a fluidized bed. The conversion rate of ethylene oxide reached 99.1%, and polyethylene oxide with a molecular weight of about 420,000 was obtained. Laser particle size analysis showed that the average particle size of the product was It is about 47 μm, and the sieving rate of 20 mesh sieve is 99%.

Embodiment 3

[0036] Step 1: Same as Example 2, except that the add-on of metal calcium, propylene oxide and acetonitrile is changed into 15kg, 21.7kg and 6.2kg successively, all the other conditions are unchanged.

[0037] Step 2: Same as Example 2, except that the shearing speed is changed to 300rpm, and the 90# solvent addition is changed to 8m3, all the other conditions are unchanged.

[0038]After 12 hours of reaction, the suspended material in the reactor was filtered by a filter and dried in a fluidized bed. The conversion rate of ethylene oxide reached 97.8%, and polyethylene oxide with a molecular weight of about 900,000 was obtained. Laser particle size analysis showed that the average particle size of the product was It is about 115 μm, 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 reaction kettle in the technical field of chemical engineering, and more specifically relates to a high-shear reaction kettle 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 properties such as lubrication, high viscosity, water retention, and thickening. 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 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 The movement speed is not enough, and there is a problem of dead angle in the reactor....

Claims

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Application Information

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Patent Type & Authority Patents(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