Emulsion polymerization reaction kettle

A technology of emulsion polymerization and reactor, which is applied in the field of emulsion polymerization, can solve the problems of unreachable product particle size and particle size distribution, low overall liquid phase flow rate, and small paddle liquid discharge, so as to reduce the amount of material crusting, Uniform distribution, enhanced axial flow effect

Pending Publication Date: 2022-07-29
WANHUA CHEM (SICHUAN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in the production process of polybutadiene latex, the dispersed phase butadiene needs to continue to replenish along with the reaction, and the liquid level in the whole reaction process reactor increases from 40% to 80%, which causes most of the reaction process Within a short period of time, the agitator used for liquid shearing above the reactor cannot be

Method used

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  • Emulsion polymerization reaction kettle
  • Emulsion polymerization reaction kettle
  • Emulsion polymerization reaction kettle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The emulsion polymerization reactor includes a vertical cylinder 1, the upper head of the cylinder 1 is provided with a material inlet 2, a gas inlet 4, a gas outlet 5, the gas outlet 5 is connected to a vacuum system, and the lower head is provided with a material outlet 3 The upper end of the cylinder body 1 is provided with a stirring shaft insertion port, one end of the stirring shaft is connected with the power unit 8, and the other end is connected with the four-leaf ring type stirrer 7, and the stirring shaft is connected with the cylinder body through a mechanical seal. The above-mentioned four-blade ring agitator 7 is composed of four blades, and the included angle between adjacent blades is 90 degrees. The wide blade 15 tapers from the blade root 16 to the blade end 17 at the hub. At the end 17 of the wide blade, there is a vertical narrow blade 13 connected to it, and the other end of the narrow blade 13 is connected to the upper hub 11 through a fixing membe...

Embodiment 3

[0063] Use the reaction kettle of Example 1. Add 50 ℃ of desalted water into the reaction kettle, start stirring, use a vacuum pump to evacuate from the gas outlet 5, feed nitrogen from the gas inlet 4, and replace the air in the kettle for many times. Under vacuum conditions, water-containing emulsifier, initiator aqueous solution, styrene and butadiene were added to the kettle in a ratio of 1:1:0.3:4. During the reaction, sampling and analysis were carried out. When the conversion rate reached 25%, additional raw materials were added. Butadiene, the ratio of butadiene supplementary amount to initial charging amount is 2:1, when the conversion rate is 50%, the raw material butadiene is supplemented for the second time, and the ratio of butadiene supplementary amount to initial charging amount is 1.5:1 , when the conversion rate is 75%, the raw material butadiene is added, and the ratio of the supplementary amount of butadiene to the initial addition amount is 1:1, and the pol...

Embodiment 4

[0065]Use the reaction kettle of Example 1. Add 50 ℃ of desalted water into the reaction kettle, start stirring, use a vacuum pump to evacuate from the gas outlet 5, feed nitrogen from the gas inlet 4, and replace the air in the kettle for many times. Under vacuum conditions, water-containing emulsifier, initiator aqueous solution, styrene and butadiene were added to the kettle in a ratio of 1.2:1:0.3:4. During the reaction, samples were taken for analysis. When the conversion rate reached 25%, additional raw materials were added. Butadiene, the ratio of butadiene supplementary amount to initial charging amount is 2:1, when the conversion rate is 50%, the raw material butadiene is supplemented for the second time, and the ratio of butadiene supplementary amount to initial charging amount is 1.5:1 , when the conversion rate is 75%, the raw material butadiene is added, and the ratio of the supplementary amount of butadiene to the initial addition amount is 1:1, and the polymeriz...

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Abstract

The invention discloses an emulsion polymerization reaction kettle. The reaction kettle comprises a vertical cylinder, an upper sealing head of the cylinder is provided with a material inlet, a gas inlet and a gas outlet, the gas outlet is connected with the vacuum system, and a lower sealing head of the cylinder is provided with a material outlet; a stirring shaft insertion opening is formed in an upper sealing head of the barrel, one end of the stirring shaft is connected with the power device, the other end of the stirring shaft is connected with the four-blade ring type stirrer, and the stirring shaft is connected with the barrel through a mechanical seal. Blades on the lower portion of the four-blade ring type stirrer are large in size, the liquid discharging capacity of the blades can be improved, the axial flow effect in the reaction kettle can be enhanced, blades on the upper portion of the four-blade ring type stirrer are arranged to be in a sawtooth shape, the shearing capacity of the blades to fluid can be improved, in addition, the height of the blades of the four-blade ring type stirrer is larger than that of the reaction kettle, and therefore the stirring efficiency is improved. And various load working conditions can be adapted. The method is used for producing polybutadiene latex, the axial temperature difference is small, the particle size is reduced to 180-500 nm, the consumption of an emulsifier in an oil phase is increased, and the consumption of a refrigerant is reduced.

Description

technical field [0001] The invention belongs to the technical field of emulsion polymerization, and relates to important equipment in the synthesis process of ABS resin, in particular to an emulsion polymerization reactor for synthesizing polybutadiene latex and a production method of polybutadiene latex. Background technique [0002] In recent years, with the requirements of light weight and high performance of electronic appliances, household consumer goods and automobiles, people's demand for high-performance materials is increasing day by day. Among them, ABS resin, as a high-performance material with superior performance, has strong hardness , good heat resistance, strong impact resistance, good light transmission and easy processing, and polyethylene, polypropylene, polyvinyl chloride, polystyrene and called five general resins. ABS resin is a terpolymer of acrylonitrile, butadiene and styrene. Emulsion graft polymerization is the most common and mature process for sy...

Claims

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Application Information

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IPC IPC(8): B01J19/18C08F236/10C08F2/01
CPCB01J19/18B01J19/0066C08F236/10C08F2/01
Inventor 付超刘鹏周兵孙一峰
Owner WANHUA CHEM (SICHUAN) CO LTD
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