lesson8Adsorption.ppt

河南城建学院专业英语课程 专业英语 河南城建学院专业英语课程 授课教师：胡继勇 化学与化学工程系 Unit 1 Basic knowledge of chemistry Lesson one; lesson two; Lesson 3; lesson 4 Unit 2 Fundamental principle of chemical engineering lesson 5--lesson 8. Unit 3 Chemical industry and technology Lesson 9--lesson 12. Unit 4 Related knowledge Lesson 13-- lesson 16. Unit 5 The chemical product and its determination Lesson 17—lesson 18 Adsorption 1.Basic concept adsorption phenomena are operative in most natural physical, biological, and chemical systems, and adsorption operations employing solids such as activated carbon and synthetic resins are used widely in industrial applications. 吸附 1基本概念 吸附现象在许多的物理，生物，和化学系统中使用，吸附操作利用 的固体如活性炭和合成树脂在工业应用中被广泛使用。 The process of adsorption involves separation of a substance from one phase accompanied by its accumulation or concentration on the surface of another. The adsorbing phase is the adsorbent, and the material adsorbed or concentrated at the surface of that phase is the adsorbate. 吸附过程中涉及物质从一相积聚或聚集在另一相表面的分离。 吸附相是吸附剂，吸附材料或聚集在这相表面的物质是吸附质。 Adsorption is thus different from adsorption, a process in which material transferred from one phase to another (e.g.liquid) interpenetrates the second phase to form a “solution”. Physical adsorption is caused mainly by van der Waals forces and electrostatic forces between adsorbate molecules and atoms which compose the adsorbent surface.Thus adsorbents are characterized first by surface properties such as surface area and polarity. 吸附是不同的，从一相转移到另一相的物质渗透到第二相的过程，形成一个“解决方案”。 物理吸附主要由范德华力，吸附质分子和构成吸附剂表面 的原子的静电力造成的。吸附剂的特点是表面性质如表面 积和极性。 The size of the micropores determines the accessibility of adsorbate molecules to the internal adsorption surface, so the pore size distribution of micropores is another important property for characterizing adsorptivity of adsorbents. Especially, Materials such as zeolites and carbon molecular sieves can be specifically engine