In a method of absorbing CO.sub.2 from a gas mixture the use of an absorption medium comprising water and at least one amine of formula (I) ##STR00001## where R.sup.1 is a (CH.sub.2).sub.n(XCH.sub.2CH.sub.2).sub.mYR.sup.3 radical where R.sup.3=hydrogen or an alkyl radical having from 1 to 6 carbon atoms, X and Y are each, independently of one another, NR.sup.3, oxygen, SO or SO.sub.2, where in the case of YSO and in the case of YSO.sub.2, R.sup.3 is not hydrogen, and YR.sup.3 can be an N-morpholinyl radical or an N-piperazyl radical, n=2 to 4, m=0 to 4 and R.sup.2 is hydrogen, an alkyl radical having from 1 to 6 carbon atoms or a radical R.sup.1, where m is not 0 when R.sup.2 is not a radical R.sup.1, YNR.sup.3 and YR.sup.3 is not an N-morpholinyl radical and not an N-piperazyl radical, makes it possible to avoid precipitation of a solid during the absorption of CO.sub.2 and a separation into two liquid phases during the regeneration of the absorption medium.

The present invention provides a process and system for waste heat grading cyclic utilization and pollutant emission reduction of sintering flue gas, in which the sintering flue gas is divided into low-temperature, high-oxygen, low-humidity section sintering flue gas; middle-temperature, low-oxygen, high-humidity section sintering flue gas; and high-temperature, high-oxygen, low-humidity section sintering flue gas according to the emission characteristics of temperature, oxygen content and humidity of the flue gas. The low-temperature, high-oxygen, low-humidity section sintering flue gas is led into the sintering machine for hot air ignition and hot air sintering; the middle-temperature, low-oxygen, high-humidity section sintering flue gas is subjected to dust removal and desulfurization treatments; the high-temperature, high-oxygen, low-humidity section sintering flue gas is mixed with exhaust gas of a cooler and then is led into the sintering machine for hot air sintering. The present invention can conduct grading utilization to the flue gas and recycle low-temperature sensible heat in flue gas, making the carbon monoxide left in the sintering flue gas burn again and thus saving energy consumption in the sintering process, on the premise that the quality and yield of the sintered ores are ensured. The present invention can also conduct cyclic utilization to the flue gas and thereby reduce pollutant emissions and the total emissions of sintering flue gas per unit of the sintered ores. Thus, the present invention has a very high value on energy saving and emission reduction.

A new adsorbent CO.sub.2-ONE for removal of acidic gases such as carbon dioxide and hydrogen sulfide was developed from hydrothermal reaction of natural limestone with natural kaolin via sodium hydroxide. Several synthesis conditions were employed such as initial concentration of NaOH, weight ratio of limestone to kaolin, reaction temperature and pressure. The produced CaNaSiO2Al2O3 samples were characterized using XRD and EDS and showed that a mixture of Gehlenite Ca.sub.2Al(Al.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22 and Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) with percentage of 43 and 57 was successfully produced, respectively. Another produced sample showed the presence of Gehlenite Ca.sub.2Al(Al.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22, Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) and Lawsonite CaAl.sub.2Si.sub.2O.sub.7OH.sub.2(H.sub.2O) with percentage of 4.1 and 7.4 and 88, respectively.

A dry scrubbing system and process wherein an acid gas comprising at least one pollutant is modified in a humid zone of a duct such that a relative humidity of between 2% and 90% is achieved. The humidified gas is then contacted with chalked lime in a reaction zone. The reaction zone components are subsequently filtered in a filtering zone to provide a filtered gas having reduced concentration of the at least one pollutant when compared to the initial acid gas.

The present invention relates to a system and a method therefor capable of reducing the amount of heat which must be supplied to a regeneration tower for regenerating an absorbent in an acid gas capture process for such acid gas as carbon dioxide and provides a low energy-type acid gas capture system and method using recirculation of an absorbent capable of reducing energy consumption by recirculating the absorbent, from which acid gas has been pre-separated, to an absorption tower before supplying the absorbent to the regeneration tower in an acid gas capture system.

Methods and systems for the valorization of carbon monoxide emissions from metallurgical furnaces into highly valuable low-carbon footprint chemicals using carbon monoxide electrolysis are disclosed herein are disclosed. A disclosed method includes operating a metallurgical furnace; obtaining, in connection with the operation of the metallurgical furnace, a volume of carbon monoxide; supplying the volume of carbon monoxide to a cathode area of a carbon monoxide electrolyzer to be used as a reduction substrate; and generating, using the carbon monoxide electrolyzer, the reduction substrate, and an oxidation substrate, a volume of generated chemicals. The volume of generated chemicals is at least one of: a volume of hydrocarbons, a volume of organic acids, a volume of alcohol, a volume of olefins and a volume of N-rich organic compounds.

The present disclosure relates to systems and methods for the production of molten metals direct oxidative combustion of one or more solid fuels. The systems and methods may be combined with coal gasifiers and related components for reducing overall energy requirements as well as external fuel sources, e.g., through the use of endogenously-generated hydrogen. In beneficial aspects, components of the carbonaceous exhaust produced in accordance with the disclosed systems and methods, such as carbon dioxide (CO.sub.2), may be isolated using carbon capture and sequestration (CCS) for reducing associated greenhouse gas emissions.

Provided is a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas, including a tower body, where a top of the tower body is provided with an air inlet channel, and a bottom of the tower body is provided with an air outlet channel, and functional zones are arranged in the tower body. The functional zones are sequentially an air inlet zone, a first protective agent zone, a first transition zone, a second protective agent zone, a second transition zone, a hydrolysis zone and an air outlet zone along a gas direction, and adjacent functional zones are communicated. Feed holes and discharge holes are uniformly arranged on an outer side surface of the tower body. Gas in a tower radially passes through the protective agent zones and the hydrolysis zone.

A process for separating CO2 from a feed stream containing at least CO2 and at least one lighter component chosen among oxygen, nitrogen, argon, methane, CO and hydrogen and at least one component heavier than CO2, comprises cooling the feed stream in a heat exchanger (E1) to a temperature less than 30 C., separation of the cooled feed stream producing a first liquid enriched in CO2 and a first gas depleted in CO2, expanding at least part of the first liquid, producing a second liquid, vaporizing the second liquid in the heat exchanger (E1) producing a second gas, sending the compressed cooled second gas to the bottom of a scrubber column (K2) and removing a top gas of the scrubber column depleted in the at least one heavier component.

Gaseous CO.sub.2 capture systems are provided. Systems of interest include a plurality of gaseous CO.sub.2 sources and at least one common CO.sub.2 capture constraining element shared by the plurality of CO.sub.2 sources. The subject systems are configured to improve at least one gaseous CO.sub.2 capture performance metric relative to a suitable control. Gaseous CO.sub.2 capture systems involving power plants, industrial plants, common mineralization capture system feed sources, common electrical grids, and common building material producers are also provided.