Methanol Rectification for Biodiesel Production

A major biodiesel producer faced significant challenges due to inefficiencies in the methanol rectification process. With this stage compromised, methanol separation could not reach the required levels, resulting in reduced purity across all products: methanol, biodiesel, glycerin, and water.

Initial Approach

The initial solution proposed was a tray column. However, Clark Solutions became involved in the project, performing detailed engineering and implementing several improvements and calculations to meet the client’s specifications. The technical analysis led to a higher-performance alternative: a column with structured packing.

The Importance of Rectification

Rectification is essential for methanol purification, separating it into recyclable methanol and a mixture of water, biodiesel, and glycerin. The complete system — with structured packing, liquid distributor, and redistributor — enhances liquid-gas contact, optimizing mass transfer.

To further address system efficiency, our feed inlet devices are designed to pre-separate and reduce velocity upon entry into the vessel, improving overall separation performance. Combined with our internal components, this setup maximizes separation efficiency.

Results Achieved

The client now consistently achieves 99.9% methanol at the top and 0.1% at the bottom of the tower, as designed. Downstream decantation has also improved, with methanol acting as an intermediate phase between light and heavy components, facilitating separation.

Backed by a broad portfolio, Clark Solutions delivers complete and customized solutions, generating significant operational gains.