生物油离子交换树脂催化酯化试验研究

生物油由于含有大量有机酸性物质而具有较强的腐蚀性,不利于其规模化利用.利用间歇式玻璃反应釜,在60 ℃、油醇质量比为1∶2、催化剂质量分数为20%和全回流条件下,研究了强酸型离子交换树脂催化的生物油酯化精制反应,目的是改变生物油的强酸性,提高其品质.结果表明,酯化后生物油的含水量和黏度下降,热值提高了42.7%；生物油中低级羧酸均得到不同程度的转化,产物分布发生较大变化,主要生成乙酸乙酯、原乙酸三乙酯等新成分,并提出了原乙酸三乙酯的生成机理.

Experimental research on bio-oil catalytic esterification using cation exchange resins

 Bio-oil contains a large amount of organic acids, which results in strong corrosion and restrains its application in large scale. Catalytic esterification of bio-oil was carried out in a total reflux mode over strongly acidic cation exchange resins in a glass batch reactor at 60 ℃. The mass ratio of oil/ethanol was 1∶2, and the catalyst mass fraction was 20% of the reaction solution. The results indicated that after esterification, the viscosity and water content of the bio-oil decreased obviously and the gross calorific value increased by 42.7%. The chemical composition of the upgraded bio-oil was different from that of the crude bio-oil, in which most of the organic acids were converted into esters. Besides, the formation mechanism of orthoacetic acid trimethyl ester was proposed．