| 武家
肇立春
张俊杰
孟思.提高米糠油中谷维素含量的脱酸工艺研究[J].中国油脂,2020,45(5):27~31.[WU Jiaqi
ZHAO Lichun
ZHANG Junjie
MENG Si.Deacidification process to increase oryzanol content in rice bran oil[J].China Oils and Fats,2020,45(5):27~31.] |
| 提高米糠油中谷维素含量的脱酸工艺研究 |
| Deacidification process to increase oryzanol content in rice bran oil |
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| DOI：10.12166/j.zgyz.1003-7969/2020.05.006 |
| 中文关键词: 米糠油 谷维素 碱炼脱酸 蒸馏脱酸 响应面法 |
| 英文关键词:rice bran oil oryzanol alkali refining deacidification distillation deacidification response surface methodology |
| 基金项目:辽宁省教育厅服务地方科研项目（LFW201905） |
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| 中文摘要: |
| 对米糠油进行脱蜡和磷酸-草酸辅助水化脱胶，再联合碱炼脱酸、蒸馏脱酸两段脱酸工艺进行脱酸，研究碱炼脱酸保留酸价以及两段脱酸工艺对谷维素留存率的影响。以谷维素含量、脱酸率、精炼率为考察指标，在单因素试验的基础上采用响应面试验优化脱酸工艺。结果表明，原油酸价（KOH）为22~25 mg/g时，碱炼脱酸保留酸价（KOH）取5 mg/g，原油酸价（KOH）为27~33 mg/g时，保留酸价（KOH）取6 mg/g，原油酸价（KOH）为35~37 mg/g时，保留酸价（KOH）取7 mg/g，谷维素留存率较高。米糠油碱炼脱酸的最佳工艺条件为温度25 ℃，时间22 min，碱液质量分数16.91%，加碱量为理论碱量加0.1%的超碱量；蒸馏脱酸的最佳工艺条件为温度225 ℃，时间86 min，真空度0098 MPa。在最佳工艺条件下，碱炼脱酸后谷维素含量为2.05%，脱酸率为77.78%，精炼率为8005%；蒸馏脱酸后谷维素含量由2.05%升高到2.16%，接近原油（2.15%），脱酸率为90.83%，精炼率为92.42%。 |
| 英文摘要: |
| Rice bran oil was dewaxed and degummed with oxalic acid and phosphoric acid, then deacidified by two-step deacidification of alkali refining combined with distillation. The effects of alkali refining retained acid value and two-step deacidification on oryzanol retention rate were studied. Taking the content of oryzanol, deacidification rate, and refining rate as indicators, response surface methodology was designed to optimize the two-step deacidification on the basis of single factor experiment. The results showed that when the acid values of crude oil were 22-25 mgKOH/g, 27-33 mgKOH/g,35-37 mgKOH/g respectively, the corresponding retained acid values were 5,6,7 mgKOH/g, at this time, the oryzanol retention rate was higher. The optimal alkali refining deacidification conditions were obtained as follows: temperature 25 ℃, time 22 min, and alkali mass fraction 16.91%, theoretical alkali plus 01% super alkali as alkali adding amount. Under these conditions, the oryzanol content was 2.05%, the deacidification rate was 77.78%, and the refining rate was 80.05%.The optimal distillation deacidification conditions were obtained as follows: temperature 225 ℃, time 86 min and vacuum degree 0.098 MPa. Under these conditions, the content of oryzanol increased from 2.05% to 2.16%, close to 2.15% of crude oil,and deacidification rate and refining rate were 90.83% and 92.42% respectively. |
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