CAJ | 학술논문

采用萃取耦合化学转化技术对生物油油溶相进行了提质研究。将稻壳快速裂解油加入适宜水使其自然分为水溶相和油溶相。以正丁醇为萃取剂和转化剂,通过在线萃取将油溶相中的酸、醛、酮等可萃物不断萃取出来,再经酯化、缩醛化反应,转化为相应正丁醇的酯、缩醛和半缩醛等。与生物油直接酯化提质相比,萃取耦合化学转化法可以显著抑制提质过程中的结焦问题,降低了提质油相的含水量和酸值,提高了其热值和可挥发性。此外,还考察了油溶相预氧化和预还原对萃取耦合化学转化提质的影响。结果表明,预氧化后可将油溶相中的醛类转化为酸,再经酯化转化为稳定性好的酯类,提质后的油品水含量低于4%,热值高于30 MJ/ kg,酸值低于2 KOH mg/ g,并且结焦率为零。
채용췌취우합화학전화기술대생물유유용상진행료제질연구。장도각쾌속렬해유가입괄의수사기자연분위수용상화유용상。이정정순위췌취제화전화제,통과재선췌취장유용상중적산、철、동등가췌물불단췌취출래,재경지화、축철화반응,전화위상응정정순적지、축철화반축철등。여생물유직접지화제질상비,췌취우합화학전화법가이현저억제제질과정중적결초문제,강저료제질유상적함수량화산치,제고료기열치화가휘발성。차외,환고찰료유용상예양화화예환원대췌취우합화학전화제질적영향。결과표명,예양화후가장유용상중적철류전화위산,재경지화전화위은정성호적지류,제질후적유품수함량저우4%,열치고우30 MJ/ kg,산치저우2 KOH mg/ g,병차결초솔위령。
Upgrading the oil-soluble fraction, which was obtained by water extraction of bio-oil from fast pyrolysis of rice husk, was investigated with simultaneous esterification and acetalation in butanol with online solvent extraction ( SEAWOSE) . The results show that almost all of the acids, aldehydes and ketones in the oil-soluble fraction can be converted to the corresponding esters, hemiacetals and acetals by SEAWOSE. In comparing with direct esterification and acetalation without extraction, the char formation is significantly suppressed. Meanwhile, the upgraded oil has very low acidity and moisture content, but high heating value andgood volatility. The effect of oxidation and reduction pretreatment of the oil-soluble fraction before SEAWOSE was also investigated. By hydrogen peroxide oxidation, the aldehydes are firstly converted into acids and subsequently esterified to esters, consequently without char formation. The upgraded oil is high quality, less than% in moisture higher than MJ/kg in heating value and less than KOH mg/g in acidity.