王安石还写诗赞扬过它:化工方面的英语翻译

来源:百度文库 编辑:中科新闻网 时间:2024/04/28 18:40:17
本文采用超临界CO2萃取车前草中的熊果酸。超临界CO2萃取以CO2为超临界流体(SpercriticalFluid,SCF)由于SCF的物理性质如密度、粘度、扩散性能都随之进入介于该物质的液体与气体之间。超临界流体的扩散系数比其液态时大将近100倍,粘度与气体相仿,而大大低于其液态时的粘度,这使得超临界流体得以象气体一样具有穿过很细的管道而高速流动的特征。所以SCF兼有液体和气体的双重特性,扩散系数大,粘度小,渗透性好。超临界CO2的溶剂化能力与液体很接近,具有优越的传质性能及溶解能力,与传统的液体溶剂相比,是更理想的溶剂。实验证明超临界CO2萃取工艺的应用是提高产品得率和质量的有效途径。通过控制压力与温度的改变或加入提携剂等方法可使超临界流体的溶剂化能力在很宽的范围内变化,在某个范围内达到萃取熊果酸的目的。为此本文采用正交实验法研究车前草种熊果酸的提取工艺。

This literary grace extracts the bear tartaric acid in the plantain with the super and critical CO2.The super and critical CO2 extracts to take CO2 as super and critical fluid(SpercriticalFluid, SCF) because of the SCF physical property,such as density, and glues a degree and spreads functions to all enter to lie immediately in should the material liquid and of the air.The great commander for proliferation coefficient to compare its liquid of the super and critical fluid is near 10000%, glue the degree and air look like, but consumedly low in its liquid of glue a degree, this make super and critical fluid can the elephant air is similar to have very thin piping but high speed fluxion of cut through of characteristic.So SCF and have the dual characteristic of the liquid and air, the proliferation coefficient is big, gluing one degree small, permeate sex good.The melting agent of the super and critical CO2 turns the ability and liquid to near to very much, have superior of spread the quality function and fuse an ability, compared with the traditional liquid melting agent is a more ideal melting agent.The experiment proves super and critical CO2's extracting the application of the craft is the valid path that raises a product to get the rate and quality.Passing the control pressure and the change of the temperature or joining to guide and help an etc. method can make the melting agent of the super and critical fluid turn an ability in variety inside the very wide scope, attaining a purpose of extract the bear tartaric acid in a certain scope.For this literary grace use is hand over the experiment method research plantain to grow the bear tartaric acid to withdraw a craft.