Application scenarios of plastic pneumatic diaphragm pumps in the chemical industry

Application scenarios and technical advantages of the chemical industry

1. Conveyor of strongly corrosive media

Typical media:

Acids: concentrated sulfuric acid (≥80% PTFE lining required), hydrochloric acid (PP/PVDF),

 nitric acid (preferably PTFE)

Alkali: Liquid alkali (PVDF resistant to 40% NaOH), ammonia water

Solvent: acetone, toluene (requires anti-static design)

Application link:

Raw material preparation: quantitative transfer of corrosive chemicals (such as electroplating 

solution tank distribution)

Waste liquid treatment: recycling of waste acid containing heavy metals (such as etching waste 

liquid with pH=1 conveyed by PVDF pump)

Reactor feed: Accurately add corrosive catalyst (pneumatically controlled flow rate ±5%)

2. Explosion-proof requirements for flammable and explosive environments

Scenario case:

Solvent workshop: conveying ethanol and xylene with flash point <28℃ (ATEX certified pump + grounded copper wire)

Polymerization zone: Transfer of acrylic monomer (double explosion-proof using nitrogen)

Technical Advantages:

Pneumatic drive exemption explosion-proof certification (GB 3836 / IECEx standard)

No motor avoids electric sparks

3. High viscosity/solid-containing fluid treatment

Typical Applications:

Resin production: Epoxy resin with a viscosity of 5,000cP (with large diameter ball valve to prevent blockage)

Pigment slurry: titanium dioxide suspension containing 30% solids (PVDF pump wear-resistant life >2000h)