CAJ | 학술논문

采用H2O2、CuO/Fe2(SO4)3复合氧化体系，在碱性条件、微波辅助作用下，对麦草碱木质素氧化降解制备单酚类化合物的工艺条件进行了研究。结果表明，在180℃相对温和的条件下，单酚类化合物的总收率可达11.86%，降解率为90.88%。单独H2 O2作为氧化剂降解木质素导致了苯环的开裂，使得木质素的降解率虽高但单酚类收率偏低；Cu2+的参与促进了木质素侧链和醚键的断裂，有利于提高单酚类化合物的收率，而Fe3+的存在则提升了H2 O2的氧化性能。适当提高氧化温度和延长降解反应时间有利于提高单酚类化合物收率。由于木质素的降解和聚合同时存在，防止降解产物的聚合成为提高单酚类化合物收率的关键。
채용H2O2、CuO/Fe2(SO4)3복합양화체계，재감성조건、미파보조작용하，대맥초감목질소양화강해제비단분류화합물적공예조건진행료연구。결과표명，재180℃상대온화적조건하，단분류화합물적총수솔가체11.86%，강해솔위90.88%。단독H2 O2작위양화제강해목질소도치료분배적개렬，사득목질소적강해솔수고단단분류수솔편저；Cu2+적삼여촉진료목질소측련화미건적단렬，유리우제고단분류화합물적수솔，이Fe3+적존재칙제승료H2 O2적양화성능。괄당제고양화온도화연장강해반응시간유리우제고단분류화합물수솔。유우목질소적강해화취합동시존재，방지강해산물적취합성위제고단분류화합물수솔적관건。
Oxidative degradation of lignin for producing monophenolic compounds was carried out under microwave irradiation, with H2 O2 , CuO and Fe2( SO4 ) 3 as the oxidants. The results indicated that the yield of monophenolic compounds and degradation rate of lignin feed reach 11. 86% and 90. 88%, respectively, under the relatively benign conditions of 180℃. Oxidative degradation of lignin with H2 O2 as a single oxidant gives a high degradation rate but a lower yield of monophenolic compounds, due to the aromatic ring opening reaction;however, Cu2+ present in the oxidant system is able to promote the cleavage of side chain and ether bond, whereas Fe3+ to enhance the oxidation ability of H2 O2 , which are then conducive to improving the yield of monophenolic compounds. A moderate increase of degradation temperature and reaction time are favorable for improving the yield of monophenolic compounds. Owing to the coexistence of lignin degradation and recondensation of degraded fragments, the prevention of degraded lignin from recondensation turns to be a key issue to achieve a high yield of monophenolic compounds.