Project Overview
A cotton gin in Lima's Villa El Salvador industrial zone had been processing 300 TPD of seed cotton for two decades, producing 30 TPD of cottonseed as a byproduct — sold at low value as whole seed for animal feed. This project converted that "waste" into two high-value products: refined cottonseed oil for Peruvian retail (DIGESA food grade) and defatted cottonseed meal for poultry feed manufacturers. Combined revenue from both products exceeds the previous whole-seed sale price by approximately 3×.
Challenge
Cottonseed presents three processing-specific challenges absent in most other oilseeds. First, gossypol — a natural phenolic pigment in cottonseed glands that is toxic to monogastric animals above 0.005% in oil. Proper conditioning at 110°C binds gossypol to protein in the cake, and bleaching at 2.5% earth removes residual gossypol from the oil. Second, high wax content (0.3–0.5%) causes cloud and solidification at refrigerator temperature without winterization — Peruvian consumers expect clear oil from the refrigerator. Third, the Lima gin runs variable cottonseed quality (damaged seed has higher FFA); the refinery must handle FFA up to 3% without excessive soap stock losses.
Solution
SinoOil designed a pre-press extraction system (no solvent — appropriate for 30 TPD scale) with four 6YL-180 presses following cottonseed-specific conditioning at 110°C. The batch refinery sequence addresses all three challenges: phosphoric acid degumming removes gums; caustic neutralization reduces FFA; bleaching at 2.5% activated earth removes gossypol pigment (oil colour shifts from green-yellow to pale yellow); winterization at 10°C (using Andes cold water, 12–15°C, for energy-efficient chilling) crystallises and filters waxes. Final deodorizing at 220°C removes cottonseed-specific volatile compounds. Finished oil passes the 0°C cold test for 5 hours — DIGESA food safety standard for wax-free claim.
The defatted cottonseed meal (5–7% residual oil after pressing) is sold to Lima poultry feed manufacturers who use it as a high-protein feed ingredient (32–35% crude protein). The meal revenue alone covers a significant portion of operating costs, making the oil revenue largely incremental margin.