Process and apparatus for removing elementary gas markets.

摘要

Invention patent: b "process and apparatus for removing elemental mercury gas of a gas" d .A process for removing elemental mercury gas of a gas that can be allowed to contain sulfur dioxide.The gas is treated in a washing column with washing liquid which circulates in a closed system, and that contains 0.01 to 300 mmol / L of ions of mercury (II) and at least two times the proportion of chloride ions. The elemental mercury present in the gas is oxidized and mercuric chloride (I) solid is formed.A part of the solid mercury chloride (I) formed is passed to a reaction unit for oxidation in chloride of mercury (II).Chlorine is proposed for the oxidation and the liquid is proposed to absorb the ions of mercury (II) formed by the oxidation process are led to pass up through a reaction zone in the PATen lower reactor unit and this zone is maintained substantially filled with mercuric chloride (I) solid.The amount of chlorine is adapted so that the chlorine will be mainly consumed during its passage to the top through the reaction zone.The liquid and its content of mercury (II) ions formed are collected and mixed with the washing liquid present above the reaction zone and subsequ00b3entemente the washing liquid thus assembled is paSsado with its content of mercury (II) increased to the circulation system closed to be recycled to the washing tower as a compensation for the ions of mercury (II) consumed to oxidizeTion of elemental mercury. An apparatus for carrying out the process has a washing column (11) and a reactor unit (26) with a cross section smaller than that of the column (11).The reactor unit (26) is connected with the bottom of the column (11) and has conduits and devices to maintain a system of closed circuit of washing liquid from a discharge opening of a liquid ((41) in the lower part of the column (11) for an opening for admission of fluid (40) on the upper part of the column (11).The lower part (42) of the washing column (11) below the level of liquid discharge opening (41) has a decreasing cross section for adaptation to the reactor unit (26).