| Lighter hydrocarbon is heavy hydrocarbons which are obtained by petroleum exploit,crude oil stability and refiner. it is liquid state at ordinary temperature,its density are lower than gasoline ,its carbon number isC4 -C16. lighter hydrocarbon always useful for petroleum chemical industry to made ethylene;or useful fuel to instead gasoline, which called green furl generally; or useful new energy resources—fuel cell. The pressure and temperature will lowed which because tube diameter and direction changed;or obstacle race of tube net such as valve etc factor ,the water which are dissolved in the lighter hydrocarbon may be changed a solid, which are yellow and like ice, we called hydrate, the hydrate may be plug oil pipeline .It is necessary that to predict and to know the condition of hydrate formation and its influence factor.On the basis of large number test data, which came from the research report that achievement are obtained by heavy oil research office of DQPI. At this paper, we are supposed that the formation of hydrate is first order of reaction, the velocity equation are proved for hydrate formation and the rate constant k are obtained by useful 64 straight line too. The count method of formation heat of hydrate and the active energy are obtained with the large number test data and Arrhenius,s equation, at the same, the formation heat of identical system are founded by this method. The count method of formation volume of hydrate are obtained, with kinetic equation which is influence of outer pressure to reaction velocity . hydrate volume of the same system are founded also. The formation mechanic of hydrate and plug reason at the transport tube of lighter hydrocarbon are elaborated at this paper also.
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