腈纶工业中硫氰酸钠溶剂的净化技术

介绍了国内外腈纶生产过程中目前使用的吸附法、萃取法、离子交换法、离子延迟树脂法、凝胶色谱法等硫氰酸钠净化工艺。其中萃取法和离子交换法流程复杂、投资大 ,存在较严重的环境污染 ,其应用受到限制。活性炭吸附法初期投资最省 ,仅适合于处理二步法溶剂。离子延迟法和凝胶色谱法由于工艺流程简单、污染轻微 ,具有很好的应用前景。尤其是凝胶色谱法 ,是目前已有的方法中分离最完全、回收率最高的净化方法 ,值得在我国腈纶工业中大力推广。

The Purification Technology of Sodium Thiocyanate Solvent for Polyacrylonitrile Fiber Industry

The purification technology of sodium thiocyanate solvent, such as adsorption, extraction, ion\|exchange, ion\|retardation and gel charomatography, were introduced. The application of extraction and ion\|exchange process is limited because of the complicated process, high investment and serious pollution. The most economical method is activated carbon adsorption process that is only suitable for two\|step solvent. Ion\|retardation and gel charomatography method have brilliant prospects, which is attributed to their simple process and slight pollution. Especially, gel charomatography method, compared with the existed process, yields the most complete separation and highest recovery ratio and is worthy to be promoted in China polyacrylonitrile industry.