Thermal Expansion Behavior of Clathrate Hydrates with Ammonium Fluoride

Ki Hun Park; Minjun Cha

doi:10.32390/ksmer.2019.56.6.631

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2019 Vol.56, Issue 6 Preview Page Next Page

Research Paper

Thermal Expansion Behavior of Clathrate Hydrates with Ammonium Fluoride 불화 암모늄이 포함된 크러스레이트 하이드레이트의 열팽창 거동 연구

31 December 2019. pp. 631-638

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Abstract

Herein, the thermal expansion behavior of clathrate hydrates with ammonium fluoride (NH₄F) was investigated. Water and NH₄F comprise a ‘host’ hydrate structure, where ‘guest’ molecules, including propylene oxide, 2-methyl-2-propen-1-ol, and methanol, are captured in hydrate cages. The X-ray diffraction patterns of the hydrate samples were examined, confirming the formation of a cubic Fd3m hydrate. Notably, methanol can be captured in the hydrate cages with NH₄F. The lattice parameters of the clathrate hydrates with NH₄F were found to be smaller than those of the clathrate hydrates with pure water. In addition, the lattice parameters of clathrate hydrates encapsulating 2-methyl-2-propen-1-ol and methanol were larger than those with propylene oxide and methane due to the effects of molecular size and shape. Finally, the effects of molecular size and shape on the thermal expansivity of clathrate hydrates with NH₄F were confirmed.

Keywords

Clathrate hydrate

thermal expansivity

ammonium fluoride

methanol

이 연구에서는 불화 암모늄(NH₄F)이 포함된 크러스레이트 하이드레이트의 열팽창 거동에 관한 연구를 수행하였다. 불화 암모늄과 물로 구성된 구조 안에 포집된 객체 분자는 프로필렌 옥사이드(Propylene oxide), 2-메틸-2-프로펜-1-올(2-Methyl-2-propen-1-ol), 메탄올(Methanol)로, X선 회절분석을 통해 얻은 하이드레이트의 패턴 분석을 통하여 입방정계 Fd3m 하이드레이트의 형성을 확인하였다. 불화 암모늄이 포함된 하이드레이트 구조는 기존의 순수 물로 구성된 하이드레이트의 격자상수에 비하여 더 작은 값을 가지는 것으로 나타났다. 객체 분자의 크기, 형태의 영향으로 2-메틸-2-프로펜-1-올과 메탄올이 포집된 하이드레이트의 격자상수는 프로필렌 옥사이드와 메탄올이 포집된 하이드레이트의 값보다 큰 것으로 확인되었으며, 열팽창률 또한 큰 것으로 확인되었다.

키워드

크러스레이트 하이드레이트

열팽창률

불화 암모늄

메탄올

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Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 56
No :6
Pages :631-638
Received Date : 2019-11-04
Revised Date : 2019-12-07
Accepted Date : 2019-12-20
DOI :https://doi.org/10.32390/ksmer.2019.56.6.631

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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