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System and process for production of polyvinyl chloride

A polyvinyl chloride, vinyl chloride technology, applied in the direction of chemical instruments and methods, transportation and packaging, mixers with rotary stirring devices, etc., can solve problems such as limitations, mass flow limit product yield, plant scale and energy consumption

Inactive Publication Date: 2010-03-31
HRD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many prior art processes and production facilities for the production of polyvinyl chloride also have various limitations such as mass flow limitations, product yields, plant size and energy consumption

Method used

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  • System and process for production of polyvinyl chloride
  • System and process for production of polyvinyl chloride

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Embodiment Construction

[0010] The process and system for the production of polyvinyl chloride (PVC) by liquid-phase free radical polymerization of vinyl chloride of the present invention employs an external high-shear mechanical device for use in a high-shear mixer device and / or a separate reaction Provides rapid contact and mixing of chemical ingredients in a controlled environment in a container. The high shear device reduces the mass transfer limitation on the reaction and thereby increases the overall reaction rate.

[0011] Chemical reactions involving liquids, gases, and solids rely on the laws of kinetics involving time, temperature, and pressure to determine reaction rates. If it is desired to react two or more raw materials in different phases (eg, solid and liquid; liquid and gas; solid, liquid and gas), one limiting factor in controlling the reaction rate involves the contact time of the reactants. In the case of heterogeneously catalyzed reactions, there is another rate-limiting factor,...

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Abstract

A method is disclosed for producing polyvinyl chloride which includes mixing a vinyl chloride solution with an initiator solution in at least one high shear mixing device comprising at least one rotor / stator set producing a rotor tip speed of at least 5.1 m / sec (1000 ft / min), to form a polymerization mixture; and allowing the mixture to polymerize by free radical polymerization to form polyvinyl chloride. The polymerization mixture may be subjected to free radical polymerization conditions comprising a temperature in the range of about 20 DEG C to about 230 DEG C. In some embodiments, the highshear mixing device produces a shear rate of at least 20,000 s-1. A system for carrying out the method is also disclosed.

Description

[0001] Statement Regarding Federally Funded Research or Development [0002] Not applicable. technical field [0003] This invention relates generally to the liquid phase polymerization of vinyl chloride to form polyvinyl chloride. More specifically, the present invention relates to apparatus and methods for the production of polyvinyl chloride which employ high shear mixing of reactants. Background technique [0004] Polyvinyl chloride (PVC) is a thermoplastic polymer widely used in the production of a wide variety of consumer products including building materials, plumb pipe, clothing, upholstery, flooring, and vinyl audio tapes, just to name a few. PVC is synthesized by free-radical polymerization of vinyl chloride monomer using a monomer-soluble initiator or catalyst. Some known initiators are azobisisobutyronitrile, t-butyl hydroperoxide, lauroyl peroxide, benzoyl peroxide, and isopropyl peroxydicarbonate. A batch of suspension preparations typically contains from ab...

Claims

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Application Information

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IPC IPC(8): C08F14/06C08F2/01B01F7/26B01F27/93
CPCB01F7/00766B01F13/1027B01J8/222B01J8/20B01F2215/0481C08F14/06B01J19/1806B01F27/2711B01F33/821C08F2/04
Inventor 阿巴斯·哈桑易卜拉西姆·巴盖尔扎德雷福德·G·安东尼格雷戈里·博尔西格阿齐兹·哈桑
Owner HRD CORP