Aiming at the problem that the mechanical seal of domestic carbonylation circulation pump fails soon after putting into use in the process plant of acetic anhydride synthesis, the choice of sealing materials, transformation method for structural design, type and arrangement of auxiliary systems were proposed. Considered from economical aspect that combined the result of coupon corrosion test, Hastelloy B2 was adopted as structure material of the mechanical seal, and KALREZ as a secondary sealing material. In order to prevent the leakage of transportation medium that is flammable, explosive, toxic, highrisk(such as acetic acid, iodine, methane, hydrogen iodide, propionic acid, etc.), the mechanical seal was designed as cartridge cascaded balance type structure. PLAN 32+PLAN 54+PLAN 62 method was adopted on seal to improve the seal working condition. To control axial displacement of the first stage static ring, retaining ring and circlip were set up in front of it. The various parameters of secondary seal in higher pressure were reasonably selected and designed to ensure the pressure ability that the friction face can take and reduce the heat which was generated by friction. As a result, the service life and reliability of mechanical seal are greatly increased.
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