The window sapphire reaction kettle is pressure resistant and the medium is visible. It is used for visible reaction research, sampling analysis, multiphase behavior observation, spray observation of supercritical particle preparation, thermodynamic property research, long-time dissolution process observation, etc. It is used in various catalytic reactions, high-temperature and high-pressure synthesis, hydrogenation reaction, gas-liquid two-phase, liquid-liquid two-phase, exothermic reaction, composition test, stability, corrosion test, fine chemical industry, supercritical reaction, catalyst evaluation and development, etc. it is mainly distributed in petrochemical, chemical, pharmaceutical, polymer synthesis, metallurgy and other fields.