The 19.5 MHz Spintrack NMR analyzer was utilized to study a FAME biodiesel production reaction. The samples analyzed were: 1) Used vegetable oil 2) Partially transesterified biodiesel product (bad biodiesel) 3) High yield FAME biodiesel product 4) Glycerin by-product from the process CPMG T2 decays were generated and then that data was processed with a inverse laplace transformation to produce T2 distribution profiles. NMR Experiment explanation is given below: The CPMG data obtained on the four samples is shown below: The T2 distribution profiles obtained by inverse Laplace transformation of the CPMG data are shown below: Plainly TD-NMR can play a role in monitoring the biodiesel production process.
The 19.5 MHz Spintrack NMR analyzer was utilized to study a large series of vacuum gas oils and FCC feeds for which PNA also has laboratory test data. The analysis was performed on a SpinTrack 19.5 MHz TD-NMR spectrometer - CPMG T2 decays were generated and then that data was processed with a inverse laplace transformation to produce T2 distribution profiles. These T2 distribution profiles are currently being correlated to physical and chemical property data. NMR Experiment explanation is given below: The CPMG data obtained on the four samples is shown below: The T2 distribution profiles obtained by inverse Laplace transformation of the CPMG data are shown below: The correlation between T2 distribution and the metal content, viscosity, distillation range, density, asphaltene content are all being investigated at the current time.
pdf version Below are examples of 13C NMR data obtained on biodiesel (FAME) and the vegetable oil precursor that it was made from by transesterification process involving microwave activation of the reaction between triglycerides and methanol in the presence of a caustic catalyst. Process NMR Associates is developing correlations between 13C NMR data and biodiesel properties stipulated in ASTM 6751.
Today one often finds hydrocarbon mixtures described by the detailed carbon type analysis that is possible from 13C NMR. Many petroleum related products are being described in this way in patents leading to a novel way of describing a material and restricting others from using those same materials in products of their own. See Exxon, Mobil, and Chevron patents such as: 6,090,989 ; 6,210,559 ; 6,059,955 ; 6,846,778 ; 20050077208 ; and 20050077209 In this PDF file we have shown some of the details present in a 13C NMR spectrum on petroleum products such a base oils, gas oils, diesels, etc. Details of NMR Analysis There are some issues with the assignements of many of these patents ... for more details on how NMR might be of use in the patent process contact John Edwards
PDF Version 1H NMR has been used extensively by Process NMR Associates to determine PIONA analysis of Naphthas and to determine detailed aromatics breakdown in aromatics unit feeds, products, and intermediate products. Below are a few examples of naphtha chemistries that are observed and quantified by 1H NMR. Conjugated Olefin analysis is performed by a combination of HH-COSY and 1D 1H NMR. For more details contact John Edwards
Saudi Aramco Research and Development are searching for an experienced NMR spectroscopist - see details Anyone who has NMR employment opportunities should contact Process NMR Associates. We would be happy to post you job listing to our blog and website. If interested please e-mail a job description, requirements, and contact information to John Edwards
Three samples were analyzed to determine if liquid or solid-state NMR techniques could be utilized to quantify adulteration of licorice powders by maltodextrin. Samples analyzed were: Maltodextrin, Licorice #1, Licorice #2 Licorice #1 and Licorice #2 were analyzed by a combination of liquid-state 1H and 13C NMR on a Varian Unity-300 spectrometer, and solid-state 13C NMR on a Varian UnityPlus 200 spectrometer. The resulting spectra are shown in the attached plots. One of the Licorice samples is adulterated by maltodextrin to an unknown concentration, the other licorice sample is pure licorice. Which sample was which was not known during the analysis. Initially it was hoped that the addition of maltodextrin to the licorice would be readily observed as new peaks appearing in the spectrum of the licorice sample. However, it can be seen that in both the 1H and 13C NMR there is considerable overlap of the peaks in the spectra of pure licorice and maltodextrin. When no observable maltodextrin peaks could be assigned it was decided to simply use the quantitative integral data from the regions of the spectrum where the maltodextrin overlaps with the licorice spectrum compared to the integrals obtained from regions solely assignable to licorice. In…