DETERMINATION OF THE STRUCTURE OF IMPURITIES IN TRIETHYLENE GLYCOL BY NMR AND HPLC-MS/MS OF HIGH RESOLUTION

The process of natural gas drying leads to accumulation of unstudied organic impurities in the used absorbent solutions. These impurities reduce the drying capacity of triethylene glycol. In order to increase the effectiveness of installations for drying natural gas it is necessary to purify triethylene glycol from the accumulated impurities. The absence of information on the structure and properties of these impurities considerably complicates the purification of the absorbent solutions. In this study the structures of impurities accumulated in triethylene glycol were determined by NMR and high resolution mass-spectrometry coupled with chromatography (HPLC-MS/MS). The obtained results will enable to improve the existing methods for the purification of the working solutions of the absorbent.

high performance liquid chromatography, high resolution mass spectrometry, nuclear magnetic resonance, triethylene glycol

1. Vyakhirev R.I., Gritsenko A.I., Ter-Sarkisov R.M. Razrabotka i ekspluatatsiya gazovykh mestorozhdeniy [Development and Exploitation of Gas Fields]. M.: Nedra-Biznestsentr Publ., 2002. 800 p. (in Russ.)

2. Bekirov T.M., Lanchakov G.A. Tekhnologiya obrabotki gaza i kondensata [The Methods for Gas and Condensate Processing]. M.: Nedra-Biznestsentr Publ., 1999. 596 p. (in Russ.)

3. Zhdanova N.V., Khalif A.L. Osushka uglevodorodnykh gazov [Drying hydrocarbon gases]. M.: Khimiya Publ., 1984. 200 p. (in Russ.)

4. Usachev M.N., Efimova Yu.A., Manuylova T.V. // Tonkie khimicheskie tekhnologii (Fine Chemicals Technologies). 2015. № 1. P. 64-69. (in Russ.)

5. Usachev M.N., Efimova Yu.A., Zaytsev N.K. // NefteGazoKhimiya (Oil & Gas Chemistry). 2015. № 4. P. 35-39. (in Russ.)

6. Lebedev A.T. Mass-spektrometriya v organicheskoy khimii [Mass spectrometry in organic chemistry]. M.: Binom. Laboratoriya znaniy Publ., 2003. 345 p. (in Russ.)

7. Ekman R., Zil'bering E., Vestman-Brinkmal'm E., Kray A. Mass Spectrometry: Instrumentation, interpretation, and applications. A Jon Wiley & Sons Inc., 2009. 383 p. (Russ. ed.: Ekman R., Zil'bering E., Vestman-Brinkmal'm E., Kray A. Mass- spektrometriya: apparatura, tolkovanie i polozheniya. M.: Tekhnosfera Publ., 2013. 368 p.).

8. Vul'fson N.S., Zaikin V.G., Mikaya A.I. Mass-spektrometriya organicheskikh soedineniy [Mass spectrometry of organic compounds]. M.: Khimiya Publ., 1986. 312 p. (in Russ.)

9. Lebedev A.T. Mass-spektrometriya dlya analiza ob"ektov okruzhayushchey sredy [Mass spectrometry for the analysis of environmental objects]. M.: Tekhnosfera Publ., 2013. 632 p. (in Russ.)

10. Elistratov A.V. // Podgotovka, pererabotka i ispol'zovanie gaza (Preparation, Processing and Using of Gas]. 1997. № 2. P. 26-35. (in Russ.)

11. Elistratov A.V., Timashev A.P., Turevskiy E.N., Borisov A.V. Thermal stability of glycols // Podgotovka i pererabotka gaza i gazovogo kondensata [Preparation and processing of gas and gas condensate]. M.: IRTs Gazprom Publ., 1998. 31 p. (in Russ.)

12. Barkov I.I., Sharonov K.G., Rozhnov A.M. // Khimiya i tekhnologiya topliv i masel (Chemistry and Technology of Fuels and Oils). 1976. № 9. P. 35-36. (in Russ.)