棉籽混合油碱炼工艺优化

为确保棉籽油的稳定生产，提高棉籽油的品质，以混合油浓度、超量碱添加量、碱液质量分数和反应时间为试验因素，以棉籽油的含皂量、色泽（R值）和精炼得率为考察指标，设计正交试验对棉籽混合油碱炼工艺条件进行优化。结果表明，棉籽混合油碱炼的最优工艺条件为混合油浓度85%，超量碱添加量0.8%，碱液质量分数12.69%（18°Bé），反应时间20 min。在最优工艺条件下，生产线上实际生产的棉籽油酸值（KOH）降到0.2 mg/g以下，过氧化值降到0.020 g/100 g，色泽（R值）可稳定控制在4.8以下，精炼得率为95.92%，优于小试试验效果。

Optimization of alkali refining process for cottonseed miscella

In order to ensure the stable production of cottonseed oil and improve the quality of cottonseed oil, with the miscella concentration, excess alkali quantity, mass fraction of alkali solution and reaction time as experimental factors, the soap content, color (R value) and refining yield of cottonseed oil as investigation indexes, the orthogonal experiment was designed to optimize the alkali refining process conditions of cottonseed miscella. The results showed that the optimal conditions were miscella concentration 85%, excess alkali quantity 0.8%, mass fraction of alkali solution 12.69%(18°Bé), and reaction time 20 min. Under the optimal conditions, the acid value of cottonseed oil actually produced in the production line was reduced to below 0.2 mgKOH/g, the peroxide value was reduced to 0.020 g/100 g, the R value could be stably controlled below 4.8, and the refining yield was 95.92%, which was better than the small-scale test.