Barium Sulfate Crystallization in the Presence of Variable Chain Length Aminomethylenetetraphosphonates and Cations (Na+ or Zn2+)
Barium Sulfate Crystallization in the Presence of Variable Chain Length Aminomethylenetetraphosphonates and Cations (Na+ or Zn2+)
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DOI：
10.1021/cg0604172
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发表时间：
2007-01
影响因子：
3.8
通讯作者：
Eleni Barouda;K. Demadis;Sandra R. Freeman;F. Jones;M. Ogden
中科院分区：
文献类型：
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作者：
Eleni Barouda;K. Demadis;Sandra R. Freeman;F. Jones;M. Ogden
硫酸钡是石油生产装置中常见的结垢，用膦酸盐抑制剂进行处理和控制。然而，对这些抑制剂如何起作用的基本理解只是慢慢出现。本文研究了两种骨架间距不同的非常相似的磷酸盐分子乙二胺-N，N,N′，N′-四亚甲膦酸（EDTMP）和六亚乙二胺-N，N,N′，N′-四亚甲膦酸（HDTMP）对硫酸钡结晶的影响。研究发现，有机分子的抑制效果不仅取决于其结构差异，还取决于其他阳离子（如Zn2+）的存在。两种膦酸盐添加剂之间的立体化学考虑和络合强度差异似乎导致了不同的抑制能力。在锌阳离子和EDTMP存在的情况下，发现抑制作用与未络合（“自由”）有机物的浓度有关。
Barium sulfate is a common scale in oil production installations that is treated and controlled with phosphonate inhibitors. A fundamental understanding of how these inhibitors operate, however, is only slowly emerging. In this paper, we investigate the effect on barium sulfate crystallization of two very similar phosphonate molecules that only differ in their backbone spacing, ethylenediamine-N,N,N‘,N‘-tetra(methylenephosphonic acid) (EDTMP) and hexamethylenediamine-N,N,N‘,N‘-tetra(methylenephosphonic acid) (HDTMP). It was found that the inhibitory efficacy of the organic molecules depends on their structural differences but also on the presence of other cations such as Zn2+. It appears that both stereochemical considerations and complexation strength differences between the two phosphonate additives result in different inhibitory powers. In the presence of zinc cations and EDTMP, it is found that inhibition is related to the concentration of uncomplexed (“free”) organic.