吸附法脱除大豆油中3-氯丙醇酯及缩水甘油酯的研究

Removal of 3-MCPD esters and glycidyl esters from soybean oil by adsorption

以大豆油为原料,研究了吸附剂种类、添加量对大豆油中3-氯丙醇酯的脱除效果和吸附剂种类、吸附剂添加量、吸附温度、吸附时间对大豆油中缩水甘油酯的脱除效果。结果表明:不同吸附剂对大豆油中3-氯丙醇酯的脱除效果依次为H-1号活性炭>活性白土> H-2号活性炭>普通活性炭>凹凸棒土,所有吸附剂对3-氯丙醇酯的脱除率均较低,脱除效果相对较好的H-1号活性炭的脱除率仅达到34. 42%(添加量为油质量0. 5%),3-氯丙醇酯含量从1. 107 mg/kg下降至0. 726 mg/kg;对缩水甘油酯的脱除效果依次为H-1号活性炭> H-2号活性炭>普通活性炭>活性白土>凹凸棒土,在添加量为2%时,前3种吸附剂对缩水甘油酯的脱除率均达到80%以上,H-1号活性炭的脱除率达到90%以上。在H-1号活性炭添加量3%、吸附时间40 min、吸附温度100℃的优化条件下,大豆油中缩水甘油酯的脱除率为95. 59%,含量从初始的2. 810 mg/kg降低至0. 124 mg/kg,可以有效脱除大豆油中的缩水甘油酯。

Using soybean oil as raw material, the impacts of adsorbent type and adsorbent dosage on the removal effect of 3 - MCPD esters and the impacts of adsorbent type, adsorbent dosage, adsorption tem- perature and adsorption time on the removal effect of glycidyl esters from soybean oil were investigated. The results showed that the order of the removal effect of different adsorbents on 3 - MCPD esters from high to low was as follows： H - 1 activated carbon, activated clay, H -2 activated carbon, common acti- vated carbon and attapulgite. The removal rates of adsorbents on 3 - MCPD esters were all low, and the removal rate of 3 - MCPD esters by H - 1 activated carbon （ dosage 0.5% of oil mass） with a relatively better removal effect was merely 34.42%, and the content of 3 - MCPD esters reduced from 1. 107 mg/kg to 0. 726 mg/kg. The order of the removal effect of different adsorbents on glycidyl esters from high to low was as follows ： H - 1 activated carbon, H - 2 activated carbon, common activated carbon, activated clay and attapulgite. When the dosage was 2%, the removal rates of the first three adsorbents on glycidyl esters were all above 80%. Furthermore, the removal rate of H - 1 activated carbon was more than 90%. The optimal removal conditions were obtained as follows： dosage of H - 1 activated carbon 3%, adsorption time 40 min and adsorption temperature 100℃. Under these conditions, the content of glycidyl esters reduced from the initial 2. 810 mg/kg to 0. 124 mg/kg, and the removal rate was 95.59%. So glycidyl esters in soybean oil could be effectively removed.