吸附法脱除花生油中苯并（a）芘的效果研究Effect of removing benzo(a)pyrene from peanut oil by adsorption

Abstract

为了降低花生油中的苯并（a）芘含量，同时兼顾花生油色泽，采用活性炭和活性白土复合吸附剂对花生油中苯并（a）芘进行吸附脱除，通过单因素实验研究了活性炭种类、复合吸附剂添加量、复合吸附剂配比、吸附温度和吸附时间对花生油中苯并（a）芘脱除效果的影响，并采用正交实验对吸附工艺条件进行优化。结果表明：活性白土和FC1X活性炭复合对花生油中的苯并（a）芘具有最好的脱除效果，最优工艺条件为复合吸附剂添加量2%、活性白土与FC1X活性炭质量比20∶ 1、吸附时间20 min、吸附温度130 ℃，在最优条件下花生油中的苯并（a）芘含量降至0.12 μg/kg，远小于欧盟限量2 μg/kg，色泽为Y10、R0.7。复合吸附剂能有效吸附脱除花生油中99%以上的苯并（a）芘，且花生油呈淡黄色、澄清透明，满足企业生产要求。 In order to reduce the content of benzo(a)pyrene in peanut oil while taking into account the color of peanut oil, the adsorption and removal of benzo(a)pyrene from peanut oil was carried out by using activated carbon and activated clay composite adsorbent. The effect of type of activated carbon, dosage of composite adsorbent, ratio of composite adsorbent, adsorption temperature and adsorption time on the removal of benzo(a)pyrene from peanut oil was investigated. The adsorption process conditions were optimized using orthogonal experiment. The results showed that the combination of activated clay and FC1X activated carbon had the best effect on the removal of benzo(a)pyrene from peanut oil, and the optimal adsorption process conditions were determined as follows: dosage of composite adsorbent 2%, mass ratio of activated clay to FC1X activated carbon 20∶ 1,adsorption time 20 min and adsorption temperature 130 ℃. Under these conditions, the content of benzo(a)pyrene in peanut oil decreased to 0.12 μg/kg, far less than the EU limit 2 μg/kg, and the color was Y10 R0.7. The composite adsorbent can effectively adsorb more than 99% of benzo(a)pyrene in peanut oil, and the color of peanut oil is light yellow, clear and transparent, which meets the requirements of peanut oil production.

Keywords

• 花生油；苯并（a）芘；吸附；活性炭；脱除率
• peanut oil; benzo(a)pyrene; adsorption; activated carbon; removal rate