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The work is considering of technology of Crude distillation unit in general modern technology of refining process. Crude distillation unit (CDU) is at the front-end of the oil refinery. Oil topping column K-1 is especially important in the general crude distillation unit technology in Russia. The main purpose of K-1 column is separation of light gasoline and the main part of the dissolved gases from crude oil in order to normalize the amount of gasoline hydrocarbons following to the main column K-2 and to stabiliz...