Preparation method for hollow fiber osmosis vaporation permeable complex film

Abstract

The invention relates to a method for preparing hollow fiber penetrate gasify composite film, which comprises: (1), preparing filming liquid that preparing the polyvinyl alcohol water solution at 2-5wt% and the sodium alginate solution at 1-5wt%, mixing them and adding the crosslinker at 1-4wt%, mixing at constant temperature, or vacuum defoaming to prepare the filming liquid; (2), treating base film that immerging the base film into NaOH water solution at 1-5wt%, keeping it at room temperature for 1h to be washed by distilled water into neutral, to be crosslinked in bake tank; (3),coating film that immerging bae film into filming liquid for 3-5s, extracting out and drying at room temperature; coating film for 2-3 times, to be crosslinked in bake tank. The invention has simple operation, low cost, uniform film, and better separate property, while it can dewater alcohol, etc.

Description

technical field [0001] The invention relates to a preparation method of a separation membrane, in particular to the preparation of a pervaporation alcohol dehydration membrane. Background technique [0002] The industrial application of membrane technology has a history of more than 40 years. Because of its simple process, wide application fields, and low energy consumption, it has been valued by countries all over the world. In China, processes such as microfiltration, ultrafiltration, electrodialysis, reverse osmosis and gas separation have been used in the production of high-purity water and in the fields of chemical industry, environmental protection, food, agriculture and medicine. [0003] In the pervaporation composite membrane separation process, the membrane has the property of preferentially permeating a certain component, which eliminates the constant boiling point and can realize the separation of two or more organic mixtures. The membrane separation process of...

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned blended membranes with sodium alginate use homogeneous flat membranes, which have low mechanical strength and are not easy for industrial applications. Compared with hollow fiber membranes, the membrane area per unit volume is smaller, and the membrane module occupies a large area. Large, and hollow fiber membranes have great advantages in these aspects