There will be a certain amount of sulfides in the biodiesel produced by the conversion of waste oil. In view of the above problems, the vacuum distillation method was used to remove the sulfides from the crude biodiesel, and the existing forms of sulfides were analyzed. The results showed that the sulfides in biodiesel mainly include those with low boiling point, such as hydrogen sulfide, mercaptan, thioether, thiamine, etc., and those with high boiling point, such as thiophene, benzothiophene, dibenzothiophene, etc. Under the conditions of controlling the top temperature of distillation desulfurization tower at 150 ℃, operating absolute pressure of 300-500 Pa, reflux ratio of 1, the low boiling point sulfide in crude biodiesel was firstly removed. And then the tower top temperature was increased to 210 ℃, so that the middle distillate （biodiesel） was distilled out, and the high boiling point heavy fraction （bio heavy oil, high boiling point sulfide） remained at the bottom of the tower bottom. Using this two-step cutting distillation method, biodiesel meeting the requirements of the latest national Ⅵ diesel emission standard （GB17930—2016, sulfur content≤10 mg/kg） can be obtained. This method can effectively reduce the sulfur content of biodiesel, and the desulfurization rate reaches 97%, and the yield of biodiesel up to the standard reaches more than 85%.
Key words
biodiesel /
desulfurization /
rectification /
waste oil
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References
[1] 苗长林, 凡佩, 吕鹏梅, 等. 磺酸型离子液体合成及催化制备生物柴油工艺研究[J]. 太阳能学报, 2018, 39(6): 1681-1687.
MIAO C L, FAN P, LYU P M, et al.Process study of sulfonic acid ionic liquids synthesis and catalytic preparation of biodiesel[J]. Acta energiae solaris sinica, 2018, 39(6): 1681-1687.
[2] MIAO C L, YANG L M, WANG Z M, et al.Lipase immobilization on amino-silane modified superparamagnetic Fe3O4 nanoparticles as biocatalyst for biodiesel production[J]. Fuel, 2018, 224: 774-782.
[3] FAN P, XING S Y, WANG J Y, et al.Sulfonated imidazolium ionic liquid catalyzed transesterification for biodiesel synthesis[J]. Fuel, 2017, 188: 483-488.
[4] MIAO C L, LI H W, ZHUANG X S, et al.Synthesis and properties of porous CLEAs lipase by the calcium carbonate template method and its application in biodiesel production[J]. RSC advances, 2019, 9: 29665-29675.
[5] 李惠文, 李志兵, 苗长林, 等. 废油脂生物柴油的脱硫处理研究[J]. 中国油脂, 2019, 44(11): 52-55, 96.
LI H W, LI Z B, MIAO C L, et al.Desulfurizatio of biodiesel prepared from waste oil[J]. China oils and fats, 2019, 44(11): 52-55, 96.
[6] 张成如. 一种生物柴油脱硫新方法: CN201810259032.1[P].2019-08-23.
ZHANG C R. A new method for desulfurization of biodiesel: CN201810259032.1[P].2019-08-23.
[7] MELLO V S E, FARIAS A C M D, SOUZA E R D V, et al. Effect of desulfurization of diesel and its blends with biodiesel on metallic contact[J]. Materials research, 2014, 17(S1): 82-88.
[8] BETHA R, BALASUBRAMANIAN R.Particulate emissions from a stationary engine fueled with ultra-low-sulfur diesel and waste-cooking-oil-derived biodiesel[J]. Journal of Air & Waste Manag Assoc ssociation,2011, 61(10): 1063-1069.
[9] 赵敏仲, 王子腾, 赵汇行, 等. 一种生物柴油粗品的连续汽提脱硫蒸馏系统: CN201920648967.9[P].2020-01-17.
ZHAO M Z, WANG Z T, ZHAO H X, et al. A continuous stripping desulfurization distillation system for crude biodiesel: CN201920648967.9[P].2020-01-17.
[10] 杨建斌, 张学旺. 生物柴油精馏脱硫系统: CN201721506443.3[P].2018-08-03.
YANG J B, ZHANG X W. A distillation desulfurization system for biodiesel: CN201721506443.3[P].2018-08-03.
[11] 肖志红, 张爱华, 李昌珠, 等. 一种萃取脱硫剂、其制备方法与生物柴油脱硫精制方法: CN201810564042.6[P].2018-11-16.
XIAO Z H, ZHANG A H, LI C Z, et al. A preparation method of extraction desulfurizer and its application in desulfurization and refining of biodiesel: CN201810564042.6[P].2018-11-16.
[12] 聂勇, 计建炳, 蔡莉, 等. 一种生物柴油脱硫新方法: CN201610766466.1[P].2017-01-18.
NIE Y, JI J B, CAI L, et al. A new method for desulfurization of biodiesel: CN201610766466.1[P].2017-01-18.
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