首页> 外文OA文献 >CaCO3 scale inhibition in paper making processes – evaluation of testing methods and inhibitor performance
【2h】

CaCO3 scale inhibition in paper making processes – evaluation of testing methods and inhibitor performance

机译:造纸过程中CaCO3水垢的抑制作用

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

The formation of an adherent layer of inorganic deposition on the surfaces of process equipment is called scaling. Scaling is a major problem in many industries using large quantities of water. One of these industries is the paper making industry and the most common scale forming compound is calcium carbonate. The scaling problem in the paper making industry can be eased or in the best case completely solved by the use of chemical additives referred to as antiscalants or scale inhibitors. The most common an-tiscalant compounds are phosphonates and polycarboxylates.The formation of calcium carbonate scale and its inhibition are widely studied themes but few of the studies are linked in the conditions of paper making. The objec-tives of this thesis are to establish laboratory testing methods for the evaluation of the performance of different scale inhibitors in the paper making conditions and to evaluate the performance of different antiscalants in these conditions. The thesis comprises an extensive literature survey and an experimental part. The literature survey covers the precipitation process of calcium carbonate, factors affecting this process and chemistry of different antiscalants. Also the theory of a computational model of French Creek’s WatSIM software is covered. In the experimental part three different laboratory test methods are utilized to conclude the performance of different antiscalants in the condi-tions of paper making. These laboratory test methods are a static jar test, a dynamic ro-tating disk procedure, and a dynamic tube blocking procedure. The WatSIM software is utilized to calculate different scaling potential indices in the conditions of paper making.The results of this thesis show that the differences between different antiscalants can be distinguished with the used laboratory testing methods and that the differences are significant. The phosphonate antiscalants might function better than polycarboxylate antiscalants in certain operating conditions but even a little change in the conditions, for example in the pH or temperature, can completely block the ability of the phosphonate antiscalants to function. The polycarboxylate antiscalants are more resistant to changes in the operating conditions, which extend their range of use. The computational results yielded with WatSIM were somewhat conflicting which indicates that the software is not fully optimized for the conditions of paper making /Kir11
机译:在处理设备表面上形成的无机沉积粘附层称为结垢。在许多使用大量水的行业中,结垢是一个主要问题。这些行业之一是造纸行业,最常见的水垢形成化合物是碳酸钙。造纸行业中的结垢问题可以通过使用化学添加剂(称为防垢剂或阻垢剂)来缓解,或者在最佳情况下可以完全解决。最常见的抗残留化合物是膦酸酯和聚羧酸酯。碳酸钙结垢的形成及其抑制是广泛研究的主题,但很少有研究与造纸条件相关。本文的目的是建立实验室测试方法,以评估造纸条件下不同阻垢剂的性能,并评估在这些条件下不同阻垢剂的性能。论文包括广泛的文献综述和实验部分。文献调查涵盖了碳酸钙的沉淀过程,影响该过程的因素以及不同防垢剂的化学性质。还涵盖了French Creek的WatSIM软件计算模型的理论。在实验部分中,使用了三种不同的实验室测试方法来总结不同防垢剂在造纸条件下的性能。这些实验室测试方法是静态广口瓶测试,动态旋转磁盘程序和动态试管堵塞程序。通过WatSIM软件在造纸条件下计算出不同的防垢电位指数。本文的结果表明,所使用的实验室检测方法可以区分出不同的防垢剂之间的差异,而且差异很大。在某些操作条件下,膦酸酯类防垢剂的功能可能比聚羧酸酯类防垢剂更好,但即使是例如pH或温度等条件的微小变化,也可以完全阻止膦酸酯类防垢剂发挥作用的能力。聚羧酸盐防垢剂对操作条件的变化更具抵抗力,从而扩展了其使用范围。 WatSIM产生的计算结果有些矛盾,这表明该软件并未针对造纸/ Kir11的条件进行完全优化

著录项

  • 作者

    Väisänen Henri;

  • 作者单位
  • 年度 2011
  • 总页数
  • 原文格式 PDF
  • 正文语种 en
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号