Studies On Preparation Mechanism And Application Of Alkaline Ca-Bent

Alkaline Ca-bentonite is a new kind of layered materials; it has great practical value and bright market prospect because of its special anion exchange capability. For the purpose of knowing alkaline Ca-bentonite further and broadening its application, this paper had searched its preparation mechanism and proposed two kinds of application on grease refining and composed organic acid bentonite.Alkaline Ca-bentonite was prepared by activated clay and calcium hydroxide by the half-dry process. The process, which layer-spacing growing gradually, owed to the together action of calcium hydroxide move in layer and the water in layer vapor. It was concluded that drying had a big influence on reaction because its vapor control the degree of calcium hydroxide move in layer. The reaction carried out like the mechanism Bent-H+ Ca(OH))₂→Bent-Ca(OH)+H₂O.The refining technology of camellia oil using modified bentonite without water was investigated. Camellia oil was bleached by activated clay and then deacidified by alkaline Ca-bentonite while it was degumed simultaneously in this two processes. Conditions of the bleaching and deacidification processes were optimized. The results indicated that the refining technology can meet the standard of bleaching, deacidification and degumming of camellia oil, and can decrease the peroxidation and the content of the impurity in some extent. It was concluded that the present technology simplifies the refining process of camellia oil and decreases cost in a great extent.The organic modification of Alkaline Ca-bentonite used hexamethylene alkyl which is not polarity as dispersant. The modification method was ebullience, circumfluence and dispart water at the same time. This method was the same with preparation of organic bentonite in C₂-C₂₀. This paper take the benzoic acid bentonite as example, on the basis of comprehensive analysis of several influence factors, the optimum parameters of preparation were given through single-factor experiments. The organic content of product was about 27.10%, approach to theory. The results of characterization showed that OH" was substituted by benzoic acid anion in layer and layer-spacing glowed. Betonite changed to hydrophobe.