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| Recovery and soap making process of waste cooking oil |
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| DOI： |
| KeyWord:waste cooking oil recovery acid value peroxide value transparent soap |
| FundProject:云南省科技厅科技计划项目（2018FD091）；国家自然科学基金地区科学基金项目（21765023）；云南省高校特色植物化学评价及应用科技创新团队支持计划 |
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| Abstract: |
| The recovery process of waste cooking oil was optimized by single factor experiment and response surface methodology with acid value and peroxide value of recovered oil as indexes. Transparent soap was prepared by saponification of the recovered waste cooking oil, and the preparation conditions were optimized with transparency as the index, a comprehensive sensory evaluation of the transparent soap was also conducted. The results showed that the optimal recovery conditions of waste cooking oil were obtained as follows: reaction temperature 106.64 ℃, stirring time 25 min, dosage of hydrogen peroxide with mass fraction of 3.5% 9.16 mL, adsorbent dosage 53.27%, ratio value of activated carbon to activated clay 40%. Under these conditions, the acid value of recovered oil was 2.15 mgKOH/g, and the peroxide value was 4.50 mmol/kg, which were in line with the national standard for crude rapeseed oil. The optimal preparation conditions of transparent soap were obtained as follows: stirring speed 70 r/min, saponification temperature 80 ℃, dosage of sodium hydroxide with mass fraction of 30% 12 mL and saponification time 45 min. Under these conditions, the transparency of transparent soap was 58.2% with good comprehensive sensory evaluation feedback. |
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