What are the applications of PTFE lining for chemical reaction vessels
Information summary：The PTFE plate (polytetrafluoroethylene plate) lining of chemical reaction vessels has various applications in chemical reaction vessels due to its excellent chemical stability, high temperature resistance, low friction coefficient and other characteristics. The following are some main aspects:
1. Corrosion resistance protection
Strong acid-base medium reaction: In chemical reactions involv
The PTFE plate (polytetrafluoroethylene plate) lining of chemical reaction vessels has various applications in chemical reaction vessels due to its excellent chemical stability, high temperature resistance, low friction coefficient and other characteristics. The following are some main aspects:
1. Corrosion resistance protection
Strong acid-base medium reaction: In chemical reactions involving strong acids such as sulfuric acid, hydrochloric acid, nitric acid, as well as strong bases such as sodium hydroxide and potassium hydroxide, PTFE lining can effectively isolate the kettle body from the medium and prevent the kettle body from being corroded.
Organic solvent reaction: PTFE lining exhibits good tolerance to reactions involving organic solvents such as benzene, toluene, and xylene. In the pharmaceutical industry's drug synthesis reactions, many reactions need to be carried out in organic solvent systems. PTFE lining can prevent the reaction vessel from swelling and corrosion by organic solvents, ensuring the smooth progress of the reaction and the service life of the equipment.
Halogen and halogenated compound reactions: In reactions involving halogen elements such as fluorine gas and chlorine gas, as well as halogenated compounds such as dichloromethane and trichloromethane, PTFE lining has good corrosion resistance. In organic fluorine chemical industry, some fluorine reactions require highly corrosive fluorine gas, and PTFE lining can provide reliable protection for the reaction vessel.
2. Anti stick and low friction applications
High viscosity material reaction: When the reaction material has high viscosity, such as in the synthesis reaction of some high molecular polymers, the low friction coefficient of PTFE lining can prevent the material from adhering to the kettle wall, avoiding material accumulation and scaling, which is conducive to the uniform progress of the reaction and the smooth discharge of products. When producing viscous polymers such as polyvinyl acetate, PTFE lining can make the discharge after the reaction smoother, reducing the workload and frequency of cleaning the reaction kettle.
Solid material grinding and mixing: In some reaction processes that require solid material grinding and mixing, PTFE lining can reduce the friction between the material and the kettle wall, resulting in better grinding and mixing effects. For example, in the production of pigments and coatings, PTFE lining helps to improve grinding efficiency, reduce energy consumption, and avoid material adhesion that affects product quality when grinding and mixing solid pigment particles.
3. High temperature resistance and insulation applications
High temperature reaction environment: PTFE has high heat resistance and can be used for a long time in the temperature range of -180 ℃ to 260 ℃. In some high-temperature chemical reactions, such as petroleum cracking and coal dry distillation, PTFE lining can withstand high temperatures to ensure the normal operation of the reaction vessel under high temperature conditions, while preventing heat loss and improving the thermal efficiency of the reaction.
Temperature sensitive reactions: For reactions that require strict temperature control, the insulation performance of PTFE lining can reduce heat exchange inside and outside the reaction vessel, helping to maintain the stability of the reaction temperature. In chemical production, the synthesis reactions of many pharmaceutical intermediates are very sensitive to temperature changes. PTFE lining can help the reaction kettle better control the temperature, improve reaction selectivity and product quality.
4. Application of special chemical reactions
Catalytic reactions: In some catalytic reactions, PTFE lining can provide a stable reaction environment, avoiding unnecessary interactions between the catalyst and the reactor material, which can affect the catalytic effect. For example, in hydrogenation reactions, when using precious metal catalysts, PTFE lining can prevent catalyst poisoning, ensure the activity and service life of the catalyst, and improve the conversion rate and selectivity of the reaction.
Electrochemical synthesis reaction: In the field of electrochemical synthesis, PTFE plates lining the reactor can serve as insulation and corrosion protection. For example, in the production of certain chemical products by electrolysis, PTFE lining can prevent corrosion of the reaction vessel by the electrolyte, while ensuring insulation performance between the electrode and the vessel body, ensuring the normal progress of electrochemical synthesis reactions.
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