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首页> 外文期刊>Crystal growth & design >Barium sulfate crystallization in the presence of variable chain length aminomethylenetetraphosphonates and cations (Na+ or Zn2+)
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Barium sulfate crystallization in the presence of variable chain length aminomethylenetetraphosphonates and cations (Na+ or Zn2+)

机译：在可变链长的氨基亚甲基四膦酸盐和阳离子（Na +或Zn2 +）存在下，硫酸钡结晶

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摘要

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.
机译：硫酸钡是石油生产装置中常见的水垢，用膦酸盐抑制剂处理和控制。然而，对这些抑制剂如何运作的基本了解只是逐渐出现。在本文中，我们研究了两个非常相似的膦酸酯分子（分别仅在主链间距上不同）的乙二胺-N，N，N'，N'-四（亚甲基膦酸）（EDTMP）和六亚甲基二胺-N对硫酸钡结晶的影响，N，N′，N′-四（亚甲基膦酸）（HDTMP）。发现有机分子的抑制功效取决于它们的结构差异，还取决于其他阳离子（例如Zn2 +）的存在。似乎两种膦酸酯添加剂之间的立体化学考虑和络合强度差异均导致不同的抑制能力。发现在锌阳离子和EDTMP的存在下，抑制作用与未络合的（“游离的”）有机物的浓度有关。

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