甲苯法生产己内酰胺水溶液的吸附精制工艺试验研究

Purification of Caprolactam Aqueous Solution by Means of Adsorption Agent

以活性炭、活性炭纤维及离子交换树脂作为吸附剂,在甲苯法己内酰胺水溶液中试验了不同吸附剂对己内酰胺水溶液中杂质的吸附能力。结果表明,当光密度均降低30%时,采用活性炭吸附,对己内酰胺中有机杂质的动态吸附容量为26.7mL/g;活性炭纤维杂乱填充时的动态吸附容量为67.48mL/g;强碱性离子交换树脂IAR900的动态吸附容量为46.66mL/mL。提出了活性炭纤维与离子交换树脂组合吸附工艺,当光密度均降低50%时,动态吸附容量为36.67mL/g,该组合工艺能有效去除己内酰胺水溶液中的杂质,提高了产品的质量。

The purification of 30% caprolactam aqueous solution in the SNIA technology by means of adsorbents and ion exchange resins was studied. The conductivity and the (absorption) value in 290nm were used to show the impurities value of inorganic and organic compounds in (caprolactam) aqueous solution respectively. When the absorption value decreased by 30% the (dynamic) adsorption capability for organic impurities in 30% caprolactam aqueous solution with (active) carbon was 26.7 mL/g. And the dynmic adsorption calability values with active carbon fibre and anion exchange resin separately (OH form) were 45.91 mL/g and 46.66 mL/mL respectively. When active carbon fibre and strong base anion exchange resin (OH form) were used together, the (absorption) value in 290 nm decreased by 50% and dynamic adsorption capability for organic (impurities) was 36.67 mL/g.