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A kind of production method of chlorinated polyvinyl chloride resin

A technology of chlorinated polyvinyl chloride and production method, which is applied in the chemical industry, can solve the problems of poor thermal stability of chlorinated polyvinyl chloride resin, high energy consumption of waste gas treatment, and long drying process, and achieves obvious energy-saving effect and low energy consumption. The effect of reducing and increasing the Vicat softening temperature

Active Publication Date: 2021-06-08
山东高信化学股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drying process of this patented technology needs to be dried at 60°C for 16 hours. The drying process takes a long time, the exhaust air volume is high, and the amount of material entrainment is large.
[0006] The existing drying methods have the following problems: high exhaust air volume, large amount of material entrainment, high energy consumption for waste gas treatment, long drying process, low heat transfer efficiency, poor thermal stability of chlorinated polyvinyl chloride resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 A kind of production method of chlorinated polyvinyl chloride resin

[0034] (1) Chlorination

[0035] In a 5m3 reactor, add 600kg of PVC resin and 3.5m of process water 3 , add 1200g of benzoyl peroxide and 3500g of dispersant sodium methacrylate, stir evenly to prepare a suspension solution, raise the temperature to 50°C for infiltration, and infiltrate for 10min.

[0036] Then, 406kg of chlorine gas was passed into the suspension solution, the reaction temperature was 60°C-120°C, the reaction time was 3.5h, and the reaction was completed to obtain chlorinated polyvinyl chloride slurry.

[0037] (2) Separation

[0038] The chlorinated polyvinyl chloride slurry is deacidified, neutralized, and centrifuged to obtain a wet material with a water content of 20%.

[0039] Wherein the deacidification step is: using a filter head filter to remove hydrochloric acid in the chlorinated polyvinyl chloride.

[0040] In the first step, the concentrated hydrochloric...

Embodiment 2

[0053] Embodiment 2 A kind of production method of chlorinated polyvinyl chloride resin

[0054] (1) Chlorination

[0055] at 25m 3 In the reaction kettle, add PVC resin 3500kg, 10% hydrochloric acid solution 16.5m 3 , add 5000g of benzoyl peroxide, 6000g of hydrogen peroxide, and 5000g of a copolymer of ethylene oxide and propylene oxide, stir evenly to prepare a suspension solution, heat up to 50°C, and soak for 10 minutes.

[0056] Then, 2450 kg of chlorine gas is passed into the suspension solution, the reaction temperature is 40°C-110°C, the reaction time is 4.0h, and the reaction is completed to obtain chlorinated polyvinyl chloride slurry.

[0057] (2) Separation

[0058] The chlorinated polyvinyl chloride slurry is deacidified, neutralized, and centrifuged to obtain a wet material with a water content of 15%.

[0059] Wherein the deacidification step is: using a filter head filter to remove hydrochloric acid in the chlorinated polyvinyl chloride.

[0060] In the fir...

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PUM

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Abstract

The invention discloses a production method of chlorinated polyvinyl chloride resin, comprising a drying process, the drying process is a fluidized bed drying method, including a feeding section, a drying section and a cooling section, and the feeding section includes introducing hot air; Hot air enters the dryer from the bottom of the dryer through the air distribution plate to mix with the mixture. The drying section includes that the mixture of chlorinated polyvinyl chloride wet material is in contact with the built-in heat exchanger, and the mixture of chlorinated polyvinyl chloride wet material is driven by hot air and passes between the plates of the built-in heat exchanger. Compared with the existing technology, the blowing volume is reduced, the amount of material entrainment is reduced, the energy consumption of waste gas treatment is reduced, and the energy saving effect of this process is obvious; the heat transfer efficiency is improved; the hot air is mainly used as the power of material fluidization during the drying process, Compared with the conventional fluidized drying method, the dosage is reduced, the exhaust temperature is 10°C-20°C lower, and the heat loss is further reduced; the thermal stability of chlorinated polyvinyl chloride resin is improved.

Description

technical field [0001] The invention relates to a production method of chlorinated polyvinyl chloride resin, which belongs to the technical field of chemical industry. Background technique [0002] Chlorinated polyvinyl chloride (CPVC) has good heat resistance, and its hard products can be used for a long time at a temperature of 100 ° C, and can maintain good mechanical properties and acid resistance, alkali resistance, and chemical resistance. Better than PVC and other general resins, it can fully meet the special requirements for equipment and pipelines in chemical production. [0003] At present, the production method of chlorinated polyvinyl chloride is mainly produced by the aqueous phase suspension method. In the production process, the water-containing material after centrifugation is removed by the drying process to obtain the finished product of chlorinated polyvinyl chloride. The usual drying process adopts the boiling drying method. Boiling drying is a materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/22C08F14/06
CPCC08F8/22C08F14/06Y02P20/10
Inventor 王曙光韩风金胜波凌玉英刘炜奇孙猛张道同
Owner 山东高信化学股份有限公司