In chemical production, handling corrosive media such as acids, alkalis, and organic solvents is common. As a core fluid device, the corrosion resistance of a vacuum pump directly affects production continuity and safety. Improper selection or poor maintenance can lead to corrosion, leakage, performance degradation, and even accidents. Therefore, scientific selection and standardized maintenance are crucial for stable chemical production.

Scientific Selection: Matching Equipment to Process Needs

The selection of corrosion-resistant vacuum pumps should be based on medium properties, operating conditions, and cost efficiency to ensure optimal compatibility.

(1) Material and Structure Based on Medium Characteristics

• Determine the type, concentration, and temperature of the medium. For example, high-concentration strong acids require pumps made of fluoroplastic (PTFE).
• For media containing particles, open-impeller pumps are recommended to prevent clogging and abrasive corrosion.

(2) Equipment Specifications According to Operating Conditions

• For low-vacuum conditions (e.g., filtration and drying), a water-ring corrosion-resistant vacuum pump is suitable.
• For high-vacuum operations (e.g., distillation), a Roots–liquid ring combination unit should be used.
• Volatile or toxic media require dual sealing systems such as “mechanical seal + labyrinth seal.”

(3) Balancing Adaptability and Cost-Effectiveness

• Choose mature, energy-efficient, and easy-to-maintain models to reduce operating costs.
• For mildly corrosive environments, stainless steel pumps with anti-corrosion coatings can replace full-fluoroplastic pumps to save costs.

Standardized Maintenance: Prolonging Service Life

Proper maintenance minimizes corrosion damage and ensures long-term reliability.

(1) Pre-Treatment of Medium to Reduce Corrosion

• Install pre-filters to remove solid particles, protecting the impeller and pump body.
• Maintain the pH value within the material’s tolerance range (e.g., PTFE: pH 1–14) and add neutralizers if necessary.

(2) Regular Inspection and Replacement of Wear Parts

• Inspect sealing systems monthly for leaks and replace seals every 3–6 months.
• Use corrosion-resistant lubricants (e.g., synthetic ester oils for organic solvents) and replace them every 2–3 months.

(3) Control Parameters and Perform Idle Maintenance

• Keep operating temperature below 80°C and avoid overpressure.
• After shutdown, rinse the pump with water or a neutral solution to remove residues.
• For long-term storage, dry the pump, apply rust inhibitors, and seal the inlets/outlets.

(4) Establish Preventive Maintenance Records

• Document temperature, pressure, and service intervals to analyze performance trends.
• Plan maintenance schedules and prepare spare parts in advance to prevent unexpected failures.

In conclusion, the harsh corrosive environment of chemical production places stringent demands on vacuum pumps. Only by integrating scientific selection with standardized maintenance can companies enhance corrosion resistance, ensure operational stability, reduce costs, and minimize safety risks — thereby supporting efficient and reliable chemical manufacturing.