评价硫化氢清除剂性能和稳定性的方法学

Andrew Rafferty, Christine Stewart-Liddon, C. Simpson, P. Hammonds, G. Graham, P. Maskell
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引用次数: 1

摘要

众所周知,一些H2S清除剂可能会因反应产物或其化学性质对盐水结垢势的影响而造成污染。介绍了一系列评估H2S清除剂性能的方法,以及在不同生产条件下产生不良反应副产物的可能性,以及每种测试方法的效用。在一系列实验室测试中,比较了三嗪基和醛基H2S清除剂的性能,包括检查溶液中残余硫化物的液相测试,以及使用现场H2S检测器测量气相H2S。这些测试能够在一系列不同的测试条件下区分不同的H2S清除剂的性能,并适用于使用清除剂的生产过程。这项工作还表明,不同清除剂的绝对性能和相对性能或排名受到所采用的测试方法的影响,因此,这项工作说明了为预期的现场应用选择合适的测试方法的重要性。清除剂的效率既取决于在液相条件下,也取决于将初始气相H2S浓度降低到所需水平所需的接触时间和计算清除能力。本文介绍了一种可用于评价和比较H2S清除剂的装置和方法。它主要描述了在通常用于清除剂初步筛选的散装液相测试中区分游离(未清除)H2S和反应(即清除/捕获)H2S的实验设计方面和挑战,并建议了一种允许常规进行此类测试的程序。然后工作人员将结果与更传统的气流监测方法进行比较。所介绍的这项工作和所描述的方法将有助于筛选和产品选择过程,并提供有关可能产生不良固体副产物的条件的信息。
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Methodology to Evaluate the Performance and Stability of Hydrogen Sulphide Scavengers
It is known that some H2S scavengers have the potential to cause fouling either from reaction products or by the influence of their chemistry on brine scaling potential. A series of methods for assessing the performance of the H2S scavengers and the likely hood of the generation of unwanted reaction by products is described along with the utility of each test methodology under different production conditions The performance of triazine- and aldehyde-based H2S scavengers are compared in a suite of laboratory tests, including liquid phase tests examining residual sulphides in solution and by measuring H2S in the gas phase using an in situ H2S detector. The tests are capable of differentiating between the performances of different H2S scavengers over a range of different test conditions and are applicable to those of the production process where scavengers are used. The work also shows that the absolute performance and relative performance or ranking of different scavengers is affected by the test methodology adopted and the work therefore illustrates the importance of selecting an appropriate test methodology for the intended field application. The efficiency of the scavengers was determined both under bulk liquid phase conditions and also by the contact time required to reduce the initial gas phase H2S concentration to the desired level and by calculating the scavenging capacity. This work presents both apparatus and methods which can be used for the evaluation and comparison of H2S scavengers. It describes primarily experimental design aspects and challenges associated with differentiating between free (unscavenged) H2S and reacted (i.e. scavenged / trapped) H2S in bulk liquid phase tests often utilised for preliminary screening of scavengers and recommends a procedure to allow such tests to be conducted routinely. Works then compare results with more conventional gas stream monitoring approaches. This work presented and the approaches described will then assist in the screening and product selection process and provides information on the conditions under which un-desirable solid by-products may be generated.
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