Investigation of Trisodium Salt Management Methods for the Manufacture of Cationic Nylon 6

阳离子尼龙6生产中三钠盐管理方法的研究

• 批准号: 542818-2019
• 负责人: Mcauley, Kim
• 金额: $ 1.82万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=680152
• 关键词: Investigation; Trisodium; Salt; Management; Methods

Nylene produces stain-resistant cationic nylon 6 polymer, using 5-sodiosulphoisophthalic acid (NaSIP) as an additive in the polymerization reactor to reduce amine end-group concentrations in the final product. Reducing the concentration of amine end groups is important because amine ends react with acidic groups in food and soil, causing stains on nylon carpets. One difficulty with incorporating NaSIP into the nylon 6 reactor is that a series of undesirable side reactions can occur, wherein NaSIP is converted to an insoluble trisodium salt (TriNaSIP). This insoluble salt precipitates from the reaction mixture and leads to fouling of reactor walls and internal structures, especially in the top portion of Nylene's reactor system, near the position where NaSIP is fed and the initial stages of polymerization occur. The degree of build-up of the precipitating trisodium salt has led to severe fouling at Nylene's plant in Arnprior, ON, so that the reactor needs to be shut down for mechanical cleaning. The objectives of this research project are to: 1) quantify the solubility of NaSIP and TriNaSIP in caprolactam and water, 2) develop an improved understanding of the reaction mechanism that generates the trisodium salt, 3) develop mathematical models to describe the rate of TriNaSIP formation under different reactor operating conditions and 4) use the model and knowledge about Nylene's polymerization process to identify operating conditions, process/recipe changes, and/or revised operational strategies to mitigate and/or prevent the fouling of the reactor, without altering the current excellent acid-stain-resistant properties of Nylene's cationic nylon 6 polymer products. A further objective is to initiate a relationship between Nylene and Prof. McAuley's research group at Queen's in the hope that a longer-term research collaboration related to efficient manufacture of new nylon 6 copolymer grades can be developed.

尼龙生产耐染色阳离子尼龙6聚合物，在聚合反应器中使用5-钠二硫苯二甲酸（NaSIP）作为添加剂，以降低最终产品中胺端基的浓度。降低胺端基的浓度很重要，因为胺端与食物和土壤中的酸性基团发生反应，会在尼龙地毯上留下污渍。将NaSIP掺入尼龙6反应器的一个困难是可能发生一系列不希望发生的副反应，其中NaSIP转化为不溶性三钠盐（TriNaSIP）。这种不溶性盐从反应混合物中沉淀下来，导致反应器壁和内部结构的污垢，特别是在Nylene反应器系统的顶部，靠近NaSIP投料和聚合初始阶段发生的位置。沉淀的三钠盐积聚的程度已经导致Nylene在安省Arnprior的工厂严重污染，因此需要关闭反应堆进行机械清洗。本研究项目的目标是：1)量化NaSIP和TriNaSIP在己内酰胺和水中的溶解度；2)进一步了解生成三钠盐的反应机理；3)建立数学模型来描述不同反应器操作条件下TriNaSIP的形成速率；4)利用模型和对尼龙聚合过程的了解来确定操作条件、工艺/配方变化。和/或修订的操作策略，以减轻和/或防止反应器的污染，而不改变目前尼龙6阳离子聚合物产品优异的耐酸染色性能。进一步的目标是在Nylene和Queen's的McAuley教授的研究小组之间建立关系，希望能够在有效制造新的尼龙6共聚物等级方面开展长期的研究合作。