Silicone-Free Defoamers for Delayed Coking

In delayed coking, foam from residue oil cracking causes coke powder carryover and column coking. Silicone-based defoamers risk contaminating downstream catalysts. Chemi Tech’s silicone-free defoamers combine alcohol-polyether compounds to suppress foam at high temperatures, ensuring continuous operation.

Innovations

High-Temperature Stability:

Polyethers (MW >15,000) and modified alcohols remain stable at 500°C. A dosage of 30–50 μg/g reduces foam height by >90%, outperforming low-silicone alternatives.

Downstream Protection:

Silicone-free formulation prevents catalyst poisoning in hydrotreating units.

Improved Coke Quality:

Reduces foam membrane stability, decreasing porosity and enhancing mechanical strength/conductivity of coke by-products.

Performance Data

In coke tower applications:

Foam Collapse: Reduces boiling zone height within 5 minutes;

Extended Suppression: >8 hours, cutting mist carryover by 70%;

Economic Benefit: Increases coke yield 3%–5% and extends operation cycles.

Validated by dynamic bubbling tests, Chemi Tech defoamers are ideal for high-viscosity residue oil systems.