动态-微波辅助法提取沉香精油的中试工艺研究

针对名贵天然香料沉香的植物状态、品质评价、沉香油的提取分离研究现状和含油量很低的沉香木质原料中的香味成分,选择了动态-微波辅助法提取其中的精油。小试阶段,研究静态-微波辅助法提取沉香油,然后放大到中试水平的动态微波辅助提取,重点研究了中试阶段各主要影响因素——沉香木质特性决定的物料粒度、影响动态流动性的因素如固液比及物料流量、影响低温状态的预热温度与微波照射所产生的温升等,综合考虑这些因素对沉香油得率的影响,筛选出适合的工艺,提出并解决了动态-微波辅助提取过程中所遇到的问题。当乙醇浓度为93%,物料粒度为40目,固液比为1:8.5,物料流量78L/h,预热温度45℃,温升15℃,在此条件下提取2次。由此获得的沉香粗提物的产率为6.9%,沉香油得率为0.68%,产品流动性与透明度好,具有沉香特有的持久芳香。动态-微波辅助提取法是适于低质沉香木中提取精油的工业化生产方法。

Dynamic-microwave extraction of Aquilaria oil in pilot experiment scale

Summary the vegetative state, quality evaluation, extraction, and separation of aquilaria, the essential oil from the aquilaria white wood was extracted by dynamic microwave extraction method (LDME). First, the extraction processing of Aquilaria oil in laboratory test was studied. Further, the extraction processing of pilot experiment of LDME was optimized, which studied the factor of the ethanol concentration, particle size, solid-lidquid ratio, material flow, and pre-heat temperature. The optimum process was obtained, which is the ethanol concentration 93%, particle size 40 mesh, solid-lidquid ratio1:8.5, material flux 78 L/h, preheat temperature 45 ℃, extraction times 2. Under the above condition, the extraction rate of materials is 6.9%, aquilaria oil yield was 0.68%.