In this paper,the formation of CaSO 4 deposit on heat transfer surface is investigated both theoretically and experimentally.The test run is performed with various treated surfaces and flow velocities. Microphotograph...In this paper,the formation of CaSO 4 deposit on heat transfer surface is investigated both theoretically and experimentally.The test run is performed with various treated surfaces and flow velocities. Microphotograph of deposit layer is made.The results obtained are compared with untreated surface under exactly identical conditions in order to determine the suitability and the characteristics of the various treated surface.It is found that the CaSO 4 deposit on the heat transfer surface can be reduced or even prevented by using surface modification techniques, such as dynamic mixing ion beam implantation and dynamic magnetron sputtering.展开更多
以二甲基乙酰胺(DM A c)/L iC l为溶剂体系、以三乙胺(TEA)为催化剂,将完全溶解的不同种类的天然纤维素原料和对甲苯磺酰氯(T os-C l)在均相条件下进行对甲苯磺酰化反应。优化了反应条件,对产品进行了元素分析、红外光谱分析和X射线衍...以二甲基乙酰胺(DM A c)/L iC l为溶剂体系、以三乙胺(TEA)为催化剂,将完全溶解的不同种类的天然纤维素原料和对甲苯磺酰氯(T os-C l)在均相条件下进行对甲苯磺酰化反应。优化了反应条件,对产品进行了元素分析、红外光谱分析和X射线衍射分析。研究了纤维素葡萄糖残基与对甲苯磺酰氯的摩尔比、纤维素原料(软木纤维素,棉纤维素以及蒸汽闪爆处理的软木纤维素、棉纤维素)种类及溶解方法对合成产物取代度的影响。展开更多
文摘In this paper,the formation of CaSO 4 deposit on heat transfer surface is investigated both theoretically and experimentally.The test run is performed with various treated surfaces and flow velocities. Microphotograph of deposit layer is made.The results obtained are compared with untreated surface under exactly identical conditions in order to determine the suitability and the characteristics of the various treated surface.It is found that the CaSO 4 deposit on the heat transfer surface can be reduced or even prevented by using surface modification techniques, such as dynamic mixing ion beam implantation and dynamic magnetron sputtering.
文摘以二甲基乙酰胺(DM A c)/L iC l为溶剂体系、以三乙胺(TEA)为催化剂,将完全溶解的不同种类的天然纤维素原料和对甲苯磺酰氯(T os-C l)在均相条件下进行对甲苯磺酰化反应。优化了反应条件,对产品进行了元素分析、红外光谱分析和X射线衍射分析。研究了纤维素葡萄糖残基与对甲苯磺酰氯的摩尔比、纤维素原料(软木纤维素,棉纤维素以及蒸汽闪爆处理的软木纤维素、棉纤维素)种类及溶解方法对合成产物取代度的影响。
