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湿解是一种模拟自然煤化的热化学转化工艺,为研究生物质湿解过程中产物的物化特性,该文以麦秆为原料,在高压反应釜中,进行了反应温度160~240℃,停留时间60 min条件下的湿解实验。研究发现,随温度的升高,固体产物产率逐渐减少,而液体产物产率增加,且在高于220℃以后,变化速度加快,如以生产固体生物炭为主,温度应控制在220℃左右。固体产物中有机官能团随温度的升高而减少,而碳碳双键、羰基和难降解的芳环结构,随温度的升高,红外吸收加强;固体表面的孔隙和微球显示其具有生物炭的结构;200℃的固体产物展现出相对较好的热稳定性。液体产物中含有还原性糖、乙酸、糠醛、5-羟甲基糠醛和5-甲基糠醛,其中还原性糖浓度较高,可以作为液体燃料的原料,随温度的升高,还原糖浓度逐渐增加,200℃后,浓度变化不大。
In order to study the physicochemical properties of the products during the wet-degradation of biomass, wet-hydrolysis is a thermo-chemical conversion process that simulates natural coalification. In this paper, the reaction temperature is 160-240 ℃ in the autoclave. Time 60 min under the conditions of the wet test. The results showed that with the increase of temperature, the yield of solid product decreased gradually and the yield of liquid product increased. After the temperature was higher than 220 ℃, the rate of change was accelerated. For example, the production of solid biochar was mainly controlled at 220 ℃ about. Organic functional groups in the solid product decrease with the increase of temperature, while the carbon-carbon double bond, carbonyl group and the aromatic ring structure which is difficult to degrade increase with the increase of temperature, the infrared absorption strengthens. The pores and microspheres on the solid surface show that they have biochar The solid product at 200 ° C showed relatively good thermal stability. The liquid product contains reducing sugar, acetic acid, furfural, 5-hydroxymethylfurfural and 5-methylfurfural, in which the reducing sugar concentration is higher, which can be used as the raw material of liquid fuel. As the temperature rises, the concentration of reducing sugar gradually Increase, 200 ℃, the concentration changed little.