Patent DE-102011121012-A1 (DE)
Title: Separating hydrocarbon, by providing first material flows in material exchange column containing hydrocarbon fraction and hydrogen, and providing second material flows containing ionic solution in the column opposite to first material flow
Inventor: GOEKE VOLKER
IPC: B01D53/14
Filed: 2011-12-13
Abstract: The method comprises providing first material flows in a material exchange column (10) containing hydrocarbon fraction and hydrogen, where the hydrocarbon fraction comprises first hydrocarbons, and providing second material flows, in the material exchange column in countercurrent to a first material flow, containing an ionic solution so that: a direct material exchange between the two material flows is manufactured in the material exchange column; the first hydrocarbons are dissolved in the ionic solution; and the hydrogen remains in a gaseous state in the first material flows. The method comprises providing first material flows in a material exchange column (10) containing hydrocarbon fraction and hydrogen, where the hydrocarbon fraction comprises first hydrocarbons, and providing second material flows, in the material exchange column in countercurrent to a first material flow, containing an ionic solution so that: a direct material exchange between the two material flows is manufactured in the material exchange column; the first hydrocarbons are dissolved in the ionic solution; and the hydrogen remains in a gaseous state in the first material flows. The hydrocarbon fraction comprises second hydrocarbons different from the first hydrocarbons, where, during the direct material exchange, the first and second hydrocarbons are dissolved in the ionic solution and the hydrogen is enriched in the first material flows. The exchange material occurs with an absorption temperature of 10-30[deg] C and an absorption pressure of 20-40 bar. The first material flows are cooled before introduction into the material exchange column, where: the hydrogen is taken off from the material exchange column over a head (11) of the material exchange column at a pressure equal to the pressure of the first material flows during introduction into the material exchange column; and the second material flows with the ionic solution charged by the first and/or second hydrocarbons is taken off over a sump (12) of the material exchange column. The second material flows are initiated, relaxed and/or heated for regenerating the ionic solution contained in the second material flows into a desorber (20) in the form of a regeneration column or a separation container so that solubilities of the first and/or second hydrocarbons in the ionic solution are exceeded and form a biphasic fluid flow, which comprises a liquid phase (F) of the ionic solution and a gaseous phase of first and/or second hydrocarbons. The second material flows are heated to 80-120[deg] C by a sump heating of the desorber having a pressure of 0.2-2 bar. The liquid phase of the ionic solution: is connected to a separator through the gaseous phase; is taken off over a sump of the desorber; and is introduced into the material exchange column over the head of the material exchange column, where the liquid phase is cooled to an absorption temperature and/or compressed to the absorption pressure. The second material flow is preheated, by an indirect heat exchange with the liquid phase of the regenerated ionic solution taken off form the sump of the desorber, with the charged ionic solution before the introduction into the desorber. The indirect heat exchange is made in the form of a counter current transmitter. The gaseous phase of the first and/or second hydrocarbons is applied in an upper section of the desorber with third material flows for the selective connection of the first hydrocarbons from the second hydrocarbons. The third material flows comprise other ionic solution, and an amine mixture.