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Device for preparing chlorinated polyvinyl chloride by gas-solid phase method and method thereof

A chlorinated polyvinyl chloride, gas-solid phase technology, applied in the field of chemical technology and equipment, can solve problems such as unsuitable for large-scale production, complex process flow, overheated agglomerated products, etc., to prevent sticking and discoloration, process flow Short, well-lit effect

Inactive Publication Date: 2010-09-15
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the process of stirred tank is simple and the discharge of pollutants is small, the heat transfer effect is poor, and it is easy to cause local overheating and agglomeration and product discoloration, so it is not suitable for large-scale production
US3532612 proposes to produce CPVC with gas-solid fluidized bed method, adopts ultraviolet lamp and initiator to catalyze the reaction, and the reaction temperature is low, which can realize the enlarged production of CPVC, but the technological process is complicated, and there is no report of realizing industrialization

Method used

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  • Device for preparing chlorinated polyvinyl chloride by gas-solid phase method and method thereof
  • Device for preparing chlorinated polyvinyl chloride by gas-solid phase method and method thereof

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preparation example Construction

[0041] In the above method for preparing chlorinated polyvinyl chloride, the raw material gas is pure chlorine gas or nitrogen gas or a mixture thereof; the particle size of the raw material PVC is 25-500 μm.

[0042] In the above method for preparing chlorinated polyvinyl chloride, the operating pressure in the riser reactor is 0.05-0.1 MPa, and the one-way residence time of PVC particles in the riser reactor is 0.5-2 min.

[0043] In the above method for preparing chlorinated polyvinyl chloride, the operating pressure of the turbulent fluidized bed reactor is 0.05-0.1 MPa, and the one-way residence time of PVC particles is 10-40 min.

Embodiment 1

[0045] in such as figure 1 In the shown device of the present invention, PVC with a particle diameter of 100-150 μm is used as raw material, the raw material gas is pure chlorine gas, and pure chlorine gas is chlorinated, the chlorination temperature is 100-110 °C, and the operating pressure in the riser reactor is 0.05 MPa , the one-way residence time of the particles is 1min, the operating pressure in the turbulent fluidized bed reactor is 0.08MPa, and the one-way residence time of the particles is 10min. After the reaction for 1h, the chlorine content of the product CPVC is 68%, which fully meets the requirements of the CPVC content.

Embodiment 2

[0047] in such as figure 1 In the shown device of the present invention, PVC with a particle diameter of 150-200 μm is used as a raw material, the raw material gas is a mixed gas of chlorine and nitrogen containing 30% chlorine, the chlorination temperature is 110-120 °C, and the operating pressure in the riser reactor is The one-way residence time of particles is 0.05MPa, the one-way residence time of particles is 2min, the operating pressure in the turbulent fluidized bed reactor is 0.06MPa, and the one-way residence time of particles is 20min. After 1.5h of reaction, the chlorine content of the product CPVC is 69%, which fully meets the CPVC content requirements.

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Abstract

The invention belongs to the technical field of chemical processes and equipment, and relates to a device for preparing chlorinated polyvinyl chloride by a gas-solid phase method and a method thereof. The chlorinated polyvinyl chloride is prepared from polyvinyl chloride (PVC) and chlorine gas serving as raw materials in a dry state. The device comprises a riser reactor, a turbulent fluidized bed reactor, an upper connecting pipe and a lower connecting pipe, wherein the synthesis of the chlorinated polyvinyl chloride is performed in the riser reactor and the turbulent fluidized bed reactor; a chain initiation process is realized and chain transfer is finished by activating the chlorine gas with ultraviolet light, so that the whole process is decoupled into a quick process and a slow process, the chlorination of the materials is uniform, bonding and discoloration can be effectively prevented, the energy consumption is reduced and the operation is simplified; the device has the advantages of compact structure, high practicability and obvious improvement on the efficiency; hydrogen chloride separated from reaction tail gas can be recycled; and the whole process has no waste discharge.

Description

technical field [0001] The invention belongs to the technical field of chemical technology and equipment, and relates to a process and a device for preparing chlorinated polyvinyl chloride (hereinafter referred to as CPVC) by reacting polyvinyl chloride (abbreviated as PVC) and chlorine gas in a dry state. Background technique [0002] In the chlor-alkali industry, about 60% of the chlorine gas produced by the electrolysis process is used to produce polyvinyl chloride, 20% is used as the raw material for organic chlorides, and there is about 20% left. Since liquid chlorine is not convenient for long-distance transportation, there are potential environmental problems in long-term storage. With the development of the chlor-alkali industry, the consumption of excess chlorine is an urgent problem to be solved. The reaction between chlorine gas and polyvinyl chloride can not only generate high value-added chlorinated polyvinyl chloride products, but also balance the excess chlor...

Claims

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Application Information

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IPC IPC(8): C08F14/06C08F8/22
Inventor 王建英胡永琪张向京刘玉敏刘润静郭欣欣
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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