Unified Gas Chromatographic Method for Determination of Methanol in Natural Gas and Related Products

N. N. Kislenko, S. A. Arystanbekova, A. A. Geras'kina

Öz


Method for determination of methanol traces in natural gas and the corresponding semi-products is developed. Method is based on pre-concentration of methanol from natural gas samples by passing it through two glasses containing water solution of sodium sulphate. Then the content of methanol was determined in the solutions obtained by analysis of their equilibrium gas phase at 60 ºC. For this purpose, gas chromatography with a packed column filled with a modified polymer adsorbent was applied. When probe containers with a volume of 300 ml are applied, the method developed allows to determine methanol in natural gas in the range 0.010-5 mg l- 1 (1.3x10-6 – 6.5x10-4 vol%). This high sensitivity of the method is reached due to the pre-concentration of the analyte. Partial separation of methanol from the matrix components allows to decrease partial superposition of chromatographic peaks of methanol and iso-butane that improves correctness of the analysis and decreases the detection limit. With the corresponding changes in the sample preparation procedures, the method developed may be used for analysis of various technological semi-products (such as non-stable and stable condensate), as well as wastes.


Tam Metin:

PDF

Referanslar


V. I Murin, N. N. Kislenko, S. A. Arystanbekova, S. V. Krashennikov, A. A. Geras’kina, I. N. Zil’tsov, Gas Chromatographic Methods for the Determination of Component Composition of Natural Gas, Moscow, GAZPROM, 2001, 60 pp. (in Russian).

A. I. Gritsenko, V. A. Istomin, A. N. Kul’kov, R. S. Suleymanov, Gathering and Conditioning of Gas on the Northern Gas Fields of Russia, Moscow, Nedra, 1999, 473 pp. (in Russian).

GOST 21443-75 “Liquefied Hydrocarbon Gases for Export. Specifications”, Moscow, Standards Publ., 1985 (in Russian).

ISO 6977-83 “Natural Gas – Determination of Water and Methanol by Gas Chromatography”.


Refback'ler

  • Şu halde refbacks yoktur.


Telif Hakkı (c) 2016 N. N. Kislenko, S. A. Arystanbekova, A. A. Geras'kina

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.