CHEMISTRY OF LIQUIFIED GASES

Code No: 641

Video Running Time: 45 minutes

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This video has been designed to assist officers in their preparation for service on board gas carriers.

Emphasis is on the safety aspects of gas shipping, requiring a thorough understanding of the underlying principles involved in the handling of gas cargoes.

The video package deals with the history of atomic structure and the Periodic Table, followed by molecules, compounds, ionic and covalent bonding. It leads on to hydrocarbon cargoes such as fuels, feedstocks and fertilisers.

The structure of alkanes is described; isomerism with reference to, butane and their boiling points is explained. Then unsaturated molecules - alkenes - are described, followed by consideration of reactions with water and oxygen, leading to corrosion and a discussion about sulphur and mercaptans. Mention is made of the reaction of aluminium with LNG and mercury. The chemistry of unsaturated compounds is dealt with, with particular reference to propylene oxide and problems with asbestos. Polymerisation is next and the use of inhibitors. The importance of monomer specification is highlighted and the need to avoid conditions which will create the isotactic version of a polymer.

The reaction of ammonia with copper, brass, mercury and carbon dioxide is covered and water solubility dealt with. Finally, a description of commercial grades of cargo is given together with their importance of temperature and pressure control on board ship.