We would be interested in hearing from anyone interested in woprking with us to develop a relatively straight forward method for NAN and TAN analysis by NMR methods. It is an interesting read for those interested in petroleum chemistry issues.Īt PNA we have been developing some high field and low field NMR techniques, looking at chemistry and relaxation in crude oils with naphthenic acid and corrosion issues. The group has made public much of it’s meeting agenda archives and the presentations given at those meetings. There are many additives, processing fluids, corrosive materials that can be found in crude oils that can cause processing issues for the buyer who purchases simply based on density and sulfur. On a related note an excellent technical site dealing with crude oil quality issues cane be found at the Crude Oil Quality Group website, which is a consortium with the following membership, dedicated to developing test methods and quality standards for crude oil trading that go well beyond the traditional gravity and sulfur measurements currently used. 1H NMR spectral correlation with these properties by PLS or non-linear PLS regression can yield extremely robust models, and for the chemical properties much more detailed chemical structure information can be obtained fro combining 13C NMR data with 1H NMR results.ĬCQTP is an association with members that span multiple segments of the Canadian oil industry -it’s history, mission, and membership can be found at the site. 1H NMR spectroscopy can be used very effectively to obtain many chemical and physical properties of crudes, heavy crudes, bitumen, and the distillate products that are produced by these materials. Further NMR analysis and a few other experiments would allow some more detailed olefin chemistry distributions to be determined as well as observe the presence of conjugated diolefins that would be particularly troublesome in the processing of these materials.
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The current CAPP method developed by the Canadian Crude Quality Technical Association (CCQTP) can be used to obtain total olefin content.
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We have developed many methods similar to this and have the ability to quantify and speciate the olefins present in the sample.
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The method is published at the following link. The method is particularly aimed at heavy oils and bitumens and their products that are not amenable to traditional olefin analysis. The Canadian Association of Petroleum Producers has produced a test method to quantify olefins in crude oils, condenates and diluents. The idea is to increase throughput by allowing extra acquisitions to be obtained on other samples during the relaxation delays of the independent experiments.An excellent video demonstration is available on the webpage dedicated to the probe, as well as references to the patent and the journal article covering the development (“Multiple-sample probe for solid-state NMR studies of pharmaceuticals”, Solid State Nuclear Magnetic Resonance 29 (2006), 204 – 213). The RF is switched between independent RF inputs and each housing has an independent tune/match capability. The concept involves stacking multiple MAS rotor housings in the probe head and then shuttling them into the central sweet spot of the magnet for acquisition via a pneumatic device attached at the base of the probe.
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This is a probe based on a patent (6,937,020) filed by Professor Eric Munson’s NMR group at the University of Kansas, and built by David Lewis of Revolution NMR. I was at the SMASH conference in Burlington Vermont earlier this week and the presentation of the week in my opinion was the multi-sample MAS probe poster by Nelson et al.