云南小粒咖啡壳水热液化产物分析

Constituent Analysis of Hydrothermally Liquefying Products of Yunnan Coffea arabica Linn.Shells

以云南小粒咖啡加工过程所产生的咖啡壳废弃物为原料,通过铁催化其水热液化,对液化产物进行真空抽滤分离水相和固相。然后用乙醚萃取水相得到轻质生物油,用乙醇萃取固相得到重质生物油和固体残渣生物炭。分别对2种生物油进行气相色谱-质谱分析,鉴别出轻油产率约7%,主要含有50%以上糠醛及其衍生物、10%以上的苯酚及其衍生物,而重油产率约14%,主要含有36.19%的咖啡因、41.3%的脂肪酸等物质。残渣固体为富含含氧官能团且均匀地嵌入了纳米零价铁(nZVI)的生物炭,具有催化过硫酸盐氧化降解四环素的性能,150 min内该生物炭可以去除水中约80%的四环素。

The coffee shell waste produced by the processing of Yunnan Arabica Coffee was used as raw material,and its hydrothermal liquefaction was catalyzed by iron and the liquefaction products were extracted by solvent to obtain the coffee shell bio-oils and the residual biochars.The light bio-oil extracted from the aqueous phase with ether and the heavy bio-oil extracted from the solid phase with ethanol were analysed by gas chromatography-mass spectrometry.It was identified that the light oil yield was around 7%,mainly containing more than 50%furfural and its derivatives,more than 10%phenol and its derivatives,while heavy oil yield was around 14%,mainly containing 36.19%caffeine,41.3%fatty acids and other substances.The solid residue was a biochar rich in oxygen-containing functional groups and uniformly embedded with nano-zero valent iron,which had the performance of catalyzing the oxidative degradation of tetracycline by persulfate,and the biochar could remove about 80% of tetracycline in water within 150 min.