[Ten years of major development in chemical equipment] 1056-2023 Impregnated polytetrafluoroethylene (PTFE) special graphite heat exchanger
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Chemical science and technology has developed greatly in the past ten years, praising the prosperity of China in the prosperous world. The sea is more lively and exciting with everyone's participation. Everyone is welcome to participate in the forum to exchange and discuss. July fires, pay attention to fire prevention ------------------------------------------------- On February 9, 2023, 12 sets of 25 square meters impregnated polytetrafluoroethylene (PTFE) special graphite heat exchangers independently developed, designed, and independently manufactured and accepted by Ecoside Graphite Technology (Jiangsu) Co., Ltd. were successfully delivered to user companies. The special graphite heat exchanger delivered this time uses micron-grade high-fine graphite and was designed, manufactured and accepted in accordance with the standards of "Technical Conditions for Chemical Equipment Made of Impermeable Graphite" (HG/T2370-2017) and "Pressure Vessels Made of Graphite" (GB/T21432-2008). After more than 100 repeated tests and technological reforms in 2 years, Ecoside Graphite Technology successfully broke through technical barriers in March 2021, independently developed and produced impregnated PTFE special graphite heat exchange equipment that is comparable to the international advanced level and serves the high-end pharmaceutical and chemical industries, filling a gap in the domestic market. At present, the equipment has been successfully used in corresponding working conditions. According to reports, compared with ordinary graphite heat exchangers, this impregnated PTFE special graphite heat exchanger has stronger corrosion resistance and high temperature resistance, and can withstand harsh conditions such as extreme vacuum and negative pressure.
one. Impregnating agent polytetrafluoroethylene dispersion 2. Working principle of impregnated graphite material Impregnation process: After the processed graphite parts are washed with water, they are put into an oven to dry. After the temperature drops to normal temperature, the graphite parts are put into an impregnation kettle. Under high vacuum and high pressure conditions, the polytetrafluoroethylene dispersion is filled into the graphite pores, and then placed in a high-temperature sintering furnace and plasticized at a high temperature of 380°C to form a polytetrafluoroethylene impermeable graphite material.
The difference between PTFE impregnated graphite and phenolic resin impregnated graphite 1. Comparison of physical properties: Since the heat treatment temperature of phenolic resin-impregnated graphite is only 120-180°C, while the heat treatment temperature of PTFE-impregnated graphite is as high as 380°C, PTFE-impregnated graphite has higher temperature resistance and smaller expansion coefficient, and its tensile, bending and impact resistance are stronger than phenolic resin-impregnated graphite. 2． Chemical stability (corrosion resistance) comparison. Phenolic resin-impregnated graphite is not resistant to oxidizing acids and alkaline media, while polytetrafluoroethylene-impregnated graphite does not react with strong acids or alkalis at all. Therefore, equipment made of graphite impregnated with polytetrafluoroethylene has better corrosion resistance than equipment made of graphite impregnated with resins such as phenolic formaldehyde. "The main equipment in the "dilute waste sulfuric acid concentration regeneration system" and "acetic acid concentration system" are made of polytetrafluoroethylene impregnated graphite materials ； It can also be used to manufacture: YKA type, XYKCH type, YKX type, XYK type, 3JK type, ST type, pipe fittings and other equipment.
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Thumbs up for the hardworking brothers!