Design of lignin-based flocculants and dispersants for various aqueous systems

用于各种水体系的木质素絮凝剂和分散剂的设计

• 批准号: RGPIN-2018-04050
• 负责人: Fatehi, Pedram
• 金额: $ 2.84万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 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=687313
• 关键词: Design; lignin; based; flocculants; dispersants

Dispersants and flocculants are water-soluble chemicals with industrial applications worldwide. Dispersants have a wide range of industrial uses, mainly to reduce viscosity of suspension and solution systems. Flocculants are widely used in wastewater treatments to remove suspended particles and dissolved organic/inorganic chemicals. However, commercially available dispersants and flocculants are mainly oil-based, expensive, ineffective, environmentally unfriendly and non-biodegradable. For these reasons, the incentives for developing greener and more efficient lignin-based dispersants/flocculants are high in the chemical industry.******Lignin has a three-dimensional structure with several aliphatic and aromatic group attachments, making it amenable for producing dispersants and flocculants. Because of its chemical structure, lignin can be tailored to have a wide range of charge densities and molecular weights, making it possible to design dispersants and flocculants with a range of different properties for potential applications in the textile, mining, and oil-sand industries and wastewater treatment systems. ******The majority of kraft lignin is currently combusted as a low-grade energy source. Lignin valorization has been considered a feasible option to make the pulping industry more profitable by using already accessible lignin resources. Dr. Fatehi's research program is unique in Canada and offers an environmentally friendly and industrially attractive approach for producing value-added water-soluble products such as dispersants and flocculants from lignin. ******The objectives of this research program are to: 1) investigate new pathways to produce lignin-based dispersants and flocculants, 2) investigate physical/rheological aspects of lignin polymerization, and 3) identify the correlations between the properties of lignin-based dispersants and flocculants and their performance in various simulated models and industrially-produced solution and suspension systems. The potential impact of this program will be the development of processes for designing lignin-based dispersants and flocculants for various colloidal systems. Considering the urgency for expanding the use of kraft lignin (and thus increasing the revenues of kraft pulp mills) and the demand for using more environmentally friendly dispersants and flocculants in the mining and oil-sand industries, it is expected that newly designed processes will be of great interest to kraft pulp mills who will use the developed technologies. The results of the proposed research will have the potential to support the kraft pulping, mining and oil-sand industries, which will increase Canada's competitiveness in the global commodities market and bring stable jobs and greater prosperity to rural communities.

分散剂和絮凝剂是水溶性化学品，在全球范围内都有工业应用。分散剂具有广泛的工业用途，主要是降低悬浮液和溶液体系的粘度。絮凝剂广泛用于废水处理中，以去除悬浮颗粒和溶解的有机/无机化学品。然而，市售的分散剂和絮凝剂主要是油基的，价格昂贵、效果不佳、对环境不友好且不可生物降解。由于这些原因，化学工业中开发更环保、更高效的木质素分散剂/絮凝剂的动力很高。 *****木质素具有带有多个脂肪族和芳香族基团连接的三维结构，使其适合于生产分散剂和絮凝剂。由于其化学结构，木质素可以定制为具有广泛的电荷密度和分子量，从而可以设计具有一系列不同性能的分散剂和絮凝剂，用于纺织、采矿和油砂工业的潜在应用和废水处理系统。 ******目前，大部分硫酸盐木质素作为低品位能源进行燃烧。木质素增值被认为是通过使用现有木质素资源使制浆工业获得更多利润的可行选择。 Fatehi 博士的研究项目在加拿大是独一无二的，提供了一种环境友好且具有工业吸引力的方法，用于生产增值水溶性产品，例如木质素的分散剂和絮凝剂。 ******该研究计划的目标是：1) 研究生产木质素分散剂和絮凝剂的新途径，2) 研究木质素聚合的物理/流变学方面，以及 3) 确定木质素的特性之间的相关性。木质素基分散剂和絮凝剂及其在各种模拟模型和工业生产的溶液和悬浮液系统中的性能。该计划的潜在影响将是开发用于各种胶体系统的木质素分散剂和絮凝剂的设计工艺。考虑到扩大牛皮纸木质素使用的紧迫性（从而增加牛皮纸浆厂的收入）以及采矿和油砂行业使用更环保的分散剂和絮凝剂的需求，预计新设计的工艺将在将使用所开发技术的牛皮纸浆厂非常感兴趣。拟议研究的结果将有可能支持牛皮纸制浆、采矿和油砂行业，这将提高加拿大在全球大宗商品市场的竞争力，并为农村社区带来稳定的就业机会和更大的繁荣。