METHOD OF A HYDROCARBON GAS PREPARATION Russian patent published in 2005 - IPC

FIELD: gas-production industry; methods of preparation of a hydrocarbon gas.

SUBSTANCE: the invention is pertaining to the field of gas-production industry, in particular, to the methods of preparation of a hydrocarbon gas. The method of preparation of a hydrocarbon gas is dealt with its field treatment, primarily, with the gas dewatering and may be used for preparation of the natural and associated gases for transportation and the low-temperature treatment. The method provides for a contact of a crude gas with methanol, separation of the liquid phase into hydrocarbons and a water solution of methanol, a regeneration of the water solution of methanol by rectification, separation of water steam from the gas. At that the separation of a liquid phase is conducted at the temperature of methanol evaporation. The evaporated methanol is fed to a rectification, and the heavy liquid fraction of hydrocarbons separated from the water solution of methanol is taken out in the form of a product. The stream of the taken out product - the stream of hydrocarbons is divided into two streams, one of which is fed as a hydrocarbon absorber to contact the initial gas, and the evaporated methanol is fed for a rectification above the feed of the water solution of methanol. At that the heating of the mixture of the being separated liquid phases is performed using the upper product of the regenerator; the light fractions of hydrocarbons are take out as a product from the middle part of the rectification system. The invention allows to increase efficiency of the gas process and to reduce the operational costs.

EFFECT: the invention allows to increase efficiency of the gas process and to reduce the operational costs.

4 cl, 1 ex, 1 dwg