Industrial Scenarios for Measuring MDI Liquid with Coriolis Mass Flow Meters
In which industrial scenarios is a Coriolis mass flow meter typically used to measure MDI (diphenylmethane diisocyanate) liquid?
MDI is characterized by high viscosity, easy crystallization, violent reaction with water, toxicity, flammability, explosiveness, and extreme fluctuations in temperature, pressure, and density. In the polyurethane industry, high-precision mixing and high-pressure closed-loop processes require only high-temperature resistant, explosion-proof Coriolis mass flow meters.
1. Precise Polyurethane Foaming Core Proportioning (Most Critical Scenario):High-pressure mixing and foaming of MDI + polyether polyols, with strict closed-loop quality control. Applications include furniture sponges, insulation boards, cold chain PU insulation, and automotive interior foaming. Proportioning deviations directly lead to foam cracking, density issues, and foam scrap.
2. MDI Chemical Synthesis and Distillation Purification Process Metering:Flow control in high-temperature pipelines of large-scale MDI units, including reactor feeding, distillation towers, and heat exchangers. Stable monitoring of monomer flow ensures uniform polymerization reaction quality.
3. Tank Truck Loading and Unloading, Tank Farm Storage and Trade Handover:Long-distance tank truck receipt and dispatch of liquid MDI hazardous chemicals, warehouse entry and exit, and upstream and downstream quality settlement are unaffected by temperature and viscosity changes. Compliant hazardous chemical trade weighing and metering.
4. Polyurethane Adhesive and Waterproof Coating Production Lines: Quantitative delivery of MDI raw material, precise AB glue proportioning, and metering of sealant and waterproof membrane raw materials.
5. High-Pressure Spraying and Sealing Casting Processes:Pipeline corrosion protection PU. Precise flow control for spraying, building sealing pouring, and high-pressure injection, compatible with MDI 50~120bar high-pressure conditions
Key Selection Points for MDI Flow Meters
1. Prone to crystallization and clogging upon contact with water: Fully sealed, dry pipeline with smooth, non-stick inner wall.
2. High-temperature insulation: 60~180℃ heat tracing and insulation to prevent low-temperature crystallization.
3. Explosion-proof rating: Ex d IIC T4 Zone 1 (hazardous area).
4. Material: 316L stainless steel/Hastelloy alloy, resistant to strong isocyanate corrosion.
5. Sealing: PTFE (polytetrafluoroethylene), rubber is strictly prohibited (reacts with MDI and fails).
6. Unaffected by high viscosity; ordinary turbine/gear meters cannot measure it.
For more information on the selection and pricing of precision MDI liquid flow meters, please contact CIXIFM Winny:
WhatsApp: 008618049841995
