Chapter 2

Hydrate Types and Formers


Hydrates are classified by the crystal structure they form. There are three common structures: type I, type II, and type H. The size of the hydrate former molecule dictates which type of hydrate will form. The smallest guest molecules form type II, the intermediate ones for type I, and the largest form Type II. Type H hydrates are only possible with a large former and a smaller molecule. This chapter discusses the common hydrate formers (also known as guest molecules) and gives the range of temperatures and pressure at which the hydrate will form for the pure components that form hydrates. The common hydrate formers include methane, ethane, propane, carbon dioxide, hydrogen sulfide, and nitrogen. Other ...

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