CAJ | 학술논문

农作物秸秆作为最具有代表性的木质纤维素资源，预处理是影响其组分分离与应用的关键因素。本文提出了基于 SO3原位微热爆结合碱洗的秸秆预处理新方法，可高效实现秸秆三大主要组分的分离。为实现预处理碱液中的木质素回收，并将分离后的碱液回收套用，借鉴离子交换树脂中金属离子交换的思路，探讨了采用离子交换形成絮凝沉淀的方式对碱液中木质素加以分离。通过金属离子筛选，采用CaCl2对碱液中木质素进行分离，分别探讨了CaCl2添加量、絮凝时间、絮凝温度、絮凝转速及碱液pH值对絮凝物中木质素含量的影响。研究表明，原碱液透析后可大大提高CaCl2对碱液中木质素的絮凝能力，同时对絮凝分离产物中木质素得率进行考察，得出1%的CaCl2添加量、絮凝6h、50℃以及pH值11分别为各自的最适条件，在该条件下絮凝分离产物中木质素得率达到61.08%。通过絮凝物的组分质量检测以及红外谱图、XPS的分析，能够确定絮凝物中木质素的存在。在此基础上，初步分析了Ca2+絮凝分离碱液中木质素的机理。
농작물갈간작위최구유대표성적목질섬유소자원，예처리시영향기조분분리여응용적관건인소。본문제출료기우 SO3원위미열폭결합감세적갈간예처리신방법，가고효실현갈간삼대주요조분적분리。위실현예처리감액중적목질소회수，병장분리후적감액회수투용，차감리자교환수지중금속리자교환적사로，탐토료채용리자교환형성서응침정적방식대감액중목질소가이분리。통과금속리자사선，채용CaCl2대감액중목질소진행분리，분별탐토료CaCl2첨가량、서응시간、서응온도、서응전속급감액pH치대서응물중목질소함량적영향。연구표명，원감액투석후가대대제고CaCl2대감액중목질소적서응능력，동시대서응분리산물중목질소득솔진행고찰，득출1%적CaCl2첨가량、서응6h、50℃이급pH치11분별위각자적최괄조건，재해조건하서응분리산물중목질소득솔체도61.08%。통과서응물적조분질량검측이급홍외보도、XPS적분석，능구학정서응물중목질소적존재。재차기출상，초보분석료Ca2+서응분리감액중목질소적궤리。
Straw is a representative lignocellulose resource,and its pretreatment is a key factor in its separation and the application of its constituents. Based on SO3micro-thermal explosion and alkali treatment,an efficient separation of three major constituents of rice straw was achieved. In this paper, in order to recover the lignin and recycle the lye,the flocculation-separation through ion exchange of lignin was explored by learning from ion exchange separation. With the screening of metal ion,CaCl2 was chosen to separate lignin in the lye. Also,the effects of different factors,such as adding amount of CaCl2,flocculation time,temperature,rotating speed and pH,on lignin isolated yield were explored. The result shows CaCl2flocculation of lignin can be greatly improved by dialysis treatment. Meanwhile,the yield of lignin in the flocculation was investigated. The optimal condition is as follows:1% of CaCl2 adding amount,6h,50℃,150r/min and pH 11. Under above condition,lignin isolated yield could reach 61.08%. With the detection of flocculate,the analysis of IR and XPS,the existence of lignin in the flocculate was determined. Further,the mechanism of flocculation-separation of lignin by Ca2+ in the lye was analyzed preliminarily.