Method and system for processing a mixture of substances containing hydrocarbons and sulfur compounds by separation technology

Abstract

A method () is proposed for processing a mixture of substances which contains predominantly or solely hydrocarbons having from M to N carbon atoms, which include sulfur-containing hydrocarbons, a first feed being formed using fluid of the mixture of substances and being subjected to a first separation in which a first fraction is formed which contains predominantly or solely hydrocarbons having from X to Y carbon atoms and at least a portion of the sulfur-containing hydrocarbons contained in the first feed, and a second feed being formed using fluid of the first fraction and being subjected to a desulfurisation, in which the sulfur-containing hydrocarbons contained in the second feed are converted predominantly or completely and hydrocarbons having more than Y carbon atoms are formed as secondary products, with the result that a product mixture of the desulfurisation contains predominantly or solely hydrocarbons having from X to Y carbon atoms and the secondary products, where M is five or six, X is five or six when M is five or is six when M is six, Y is an integer of six, seven or eight, and N is an integer greater than Y. It is provided that a third feed is formed using fluid of the product mixture and is subjected to a second separation in a two-part distillation column () which comprises two structurally separated column parts () and in which a second and a third fraction are formed, the second fraction containing at least the predominant portion of the secondary products contained in the third feed, and fluid of the third fraction being separated further in the two-part distillation column in a third separation. The present invention likewise relates to a corresponding system.