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Problems with NMR analysis of demulsifiers

2009-04-07View Original

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I’m seeking help from experts. I obtained a sample of the demulsifier AE1910 from my supplier, and the information provided indicates that polyethylene polyamine is used as the starting material. However, no C peaks corresponding to CH2-N-CH2 were detected in the NMR C spectrum. Why is that? I ordered a series of AE demulsifiers, and all of them have this problem. What’s going on?

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