What type of autoclave should be used for 7–10% sulfuric acid media?

For high-pressure reactors with very high acidity, it is difficult to find materials that meet the requirements; enamel-coated or tetrafluoroethylene-coated materials can satisfy the anti-corrosion needs, but accidents can occur under high pressure. At present, the only material in China that can meet these requirements is titanium metal used for lining the reactor interior, although this comes at a high cost. As for the type of stirring mechanism, magnetic stirring is sufficient; nothing special is required. There are also high-pressure reactors with polytetrafluoroethylene linings. I. Structural Overview: Its main structure is similar to that of the WHF and WDF series of high-pressure reactors; the operating pressure is ≤35.0 Mpa, the operating temperature is ≤200°C, and the stirring speed can be adjusted between 20–750 r/min. The main body materials include 1Gr18Ni9Ti (321), 00Gr17Ni14MO2 (316L), among others, with tetrafluoroethylene lining ； The opening of the kettle lid is the same as that of the WHF and WDF series. The linings refer mainly to the PTFE sleeve inside the kettle body, the PTFE plate installed on the flat surface of the kettle lid, PTFE covering the stirring shaft, PTFE-made stirring blades, and PTFE covering the temperature sensing protection tube ； Note: The parts in contact with the gas phase cannot be lined with PTFE (including: the magnetic stirrer and the valves, pressure gauges, and safety explosion-proof devices on the reactor lid). II. Precautions: Due to the poor thermal conductivity of PTFE material, special attention should be paid to the following points when using it: 1. The temperature of the external heating furnace during operation should not exceed 200°C, as too high a temperature can easily cause deformation of the PTFE lining inside the tank. 2. The heating rate should be slow; the temperature inside the tank can be controlled gradually by using the PID temperature control system of the finished product to regulate the temperature of the external heater. Since both the inside of the stainless steel reactor and the outside of the temperature sensing protection tube are lined with PTFE, special attention should be paid to the temperature difference between the heating temperature of the external heater and the temperature inside the reactor as measured by the temperature sensing protection tube. 3. It must not be used for vacuum pumping, and instant gas release during the reaction process can also easily lead to vacuum formation. 4. If the pressure is high, the seal is achieved through linear contact between the stainless steel reactor body and the lid; during use, ensure that no corrosive substances come into contact with the sealing surface.

:Is 4.0 high voltage?

Titanium alloy is the best choice, as it offers good corrosion resistance and sufficient strength