In the oil bleaching process, bleaching earth is the primary auxiliary material consumed. For a medium-sized refinery, reducing bleaching earth addition by just 0.1 percentage point translates into significant annual savings in material and disposal costs.

However, the challenge of bleaching earth reduction lies in: how to maintain or even improve bleaching effectiveness while reducing earth dosage?

Ocean's answer: Pre-bleaching and re-bleaching technology.

Process Principle

The core concept of pre-bleaching and re-bleaching is: using a filter press that has already filtered spent bleaching earth to pre-bleach oil that has not yet had earth added.

In practice:

· The spent earth cake from the first filtration still retains some bleaching activity

· This residual activity is used to pre-bleach the next batch of oil before fresh earth is added

· Then conventional earth addition and bleaching are carried out

Actual Results

Additional Benefits:

· Fully automated filter press operation reduces labor intensity and costs

· Reduced spent earth volume lowers environmental disposal costs

· Less neutral oil retained in spent earth directly increases yield

Beyond Bleaching Earth Reduction

Driven by 20+ years of continuous optimization across more than 200 refining lines, Ocean deeply engages with all five steps of oil refining (degumming, deacidification, bleaching, deodorization, dewaxing/fractionation), steadily stabilizing and continuously improving technical specifications.

Ocean, focused on oil refining for over two decades, is a global leading turnkey oils & fats proecssing solutions provider .