基于电解生成过氧化氢的棉漂白工艺

Bleaching of Cotton Based on Electrolytic Production of Hydrogen Peroxide

棉的前处理通常包括在碱浴中煮统除去天然杂质，接着进行漂白以破坏天然色素赋予纺织材料以白度。有时，合并这两个工艺以简化处理过程，以双氧水为基础的漂白工艺为最常见。目前已有采用阴极电解从碱性电解液制取氧的工业化生产方法，这个方法可应用于纤维素材料的煮漂合一工艺。漂白阶段所需的双氧水可在工艺过程中同时生产，方法是在为煮练而加入的碱性电解溶液存在的条件下，通过电解氧而制取。在本研究中，设计了一种电化电解槽可研究在煮漂合一工艺中应用电解的可行性。氢氧化钠用作碱性电解溶液，它同时又用作棉的煮练液。本文探讨了影响双氧水生产的参数及其对煮漂合一、工艺的效果。业已发现，施加的电压是关键因素。电解法获得了足够的白度，可与用传统方法获得的比美。

Preparation of cotton usually involves scouring of the material in an alkaline to remove the natural impurities followed by a bleaching process which imparts whiteness by destroying the natural coloring matters. The two processes are sometimes combined to simplify treatments. Bleaching based on hydrogen peroxide is most common. Industrial production of hydrogen peroxide based on the cathodic electrolysis of oxygen from an alkaline electrolyte is available. This process may be applicable in the combined scouring and bleaching of cellulosic materials. The hydrogen peroxide necessary for the bleaching stage can be produced insitu by the electrolysis of oxygen in the presence of an alkaline electrolyte added to effect scouring. In our study,an electrochemical cell was designed to study the feasibility of applying electrolysis of oxygen in a combined scouring and bleaching process. Sodium hydroxide was the alkaline electrolyte which was also used for the scouring of cotton. The parameters affecting the production of hydrogen peroxide and its effectiveness on a combined scouring and bleaching process were investigated. It was found that the voltage applied was a critical factor. Adequate degree of whiteness was obtained by the electrolytic process which is comparable to that of conventional method.