餐厨废弃油脂制生物柴油的典型指标 在储存期间的变化规律Change law of typical indexes of biodiesel made from waste cooked oil during storage

为提高餐厨废弃油脂制生物柴油的储存稳定性，以餐厨废弃油脂为原料，采用生物酶法制备生物柴油，并向其中添加0.2%的抗氧化剂，测定其在90 d储存过程中酸值、水含量、硫含量及氧化安定性的变化。结果表明：酶法制备的生物柴油各项指标满足GB 25199—2017《B5柴油》中BD100生物柴油S10的技术要求，硫含量最低为2.1 mg/kg；当添加0.2%的抗氧化剂时，生物柴油的氧化安定性由3.6 h提高至12.0 h，储存90 d后，生物柴油的硫含量、酸值、水含量、氧化安定性仍符合国标要求。酶法制备生物柴油工艺易于控制产品的各项指标，且工艺更加绿色环保，通过添加抗氧化剂可提高生物柴油的储存稳定性。To improve the storage stability of biodiesel made from waste cooked oil, with waste cooked oil as raw material, biodiesel was produced by enzymatic process and 0.2% of antioxidant was added to it,then the change of acid value, moisture content, sulfur content and oxidation stability of the biodiesel during 90 d storage were determined. The results showed that the indicators of biodiesel prepared by enzymatic method met the technical requirements of BD100 biodiesel S10 in GB 25199-2017 “B5 Diesel fuels”, with a minimum sulfur content of 2.1 mg/kg.When 0.2% antioxidant was added, the oxidation stability of biodiesel increased from 3.6 h to 12.0 h. After 90 d of storage, the sulfur content, acid value, moisture content and oxidation stability were in line with national standard requirements. Enzymatic preparation process of biodiesel is easy to control the various indicators of the product, the process is more green and environmental protection, and through the addition of antioxidant the storage stability of biodiesel can be improved.