It is described an integrated process for the production of clinker by dry process, with treatment in continuous of by-pass dusts produced by the kiln, wherein the solid matter to treat consists of bypass dusts of a clinker production process, containing compounds of chloride, sodium, potassium and sulphur, such a process comprising the following steps: a) extraction of the bypass dusts directly from the phase of quench, without intermediate storage, at a temperature comprised between 150 and 200 C., with a moisture content varying from 0.1 to 3% by weight, preferably from 0.1 to 0.5% by weight, and with a quantity of calcium carbonate lower than 55% by weight; b) mixing of said dusts coming from step a), within a maximum time comprised between 2 and 10 minutes, preferably lower than about 5 minutes, with water up to a water/dusts ratio varying from 2:1 to 4:1, preferably from 2.5:1 to 3.5:1, in a way to obtain a mixture with a moisture content comprised between 45 and 75% by weight, preferably between 50% and 55% by weight, even more preferably equal to about 50% by weight; c) mechanical stirring of the mixture diluted up to complete dissolution of the soluble salts; d) mechanical separation of the mixture so diluted in a liquid fraction containing water and soluble salts and in a solid fraction in form of cake or crust.

The present invention relates generally to the field of emission control equipment for boilers, heaters, kilns, or other flue gas-, or combustion gas-, generating devices (e.g., those located at power plants, processing plants, etc.) and, in particular to a new and useful method and apparatus for reducing and/or eliminating various liquid discharges from one or more emission control equipment devices (e.g., one or more wet flue gas desulfurization (WFGD) units). In another embodiment, the method and apparatus of the present invention is designed to reduce and/or eliminate the amount of liquid waste that is discharged from a WFGD unit by subjecting the WFGD liquid waste to one or more drying processes, one or more spray dryer (or spray dry) absorber processes, and/or one or more spray dryer (or spray dry) evaporation processes.

A method for conversion of carbon dioxide to carbon monoxide comprises: introducing a flow of a dehumidified gaseous source of carbon dioxide into a reaction vessel; and irradiating dried, solid carbonaceous material in the reaction vessel with microwave energy. Heating of the irradiated carbonaceous material drives an endothermic reaction of carbon dioxide and carbon that produces carbon monoxide. At least a portion of heat required to maintain a temperature within the reaction vessel is supplied by the microwave energy. Carbon monoxide thus produced is allowed to flow out of the reaction vessel.

The method for producing a gas separation composite membrane includes applying a mixed liquid containing compounds (a) and (b) below onto a porous support to form a coating film and curing the coating film to form a crosslinked polysiloxane compound layer: (a) a particular crosslinkable polysiloxane compound having a structural unit (a1), a structural unit (a2), and a structural unit (a3) or (a4), and (b) a particular crosslinkable polysiloxane compound having a structural unit (b1), a structural unit (b2), and a structural unit (b3) or (b4),

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where R.sup.1a to R.sup.1f and R.sup.2a to R.sup.2f represent a particular group and * represents a particular linking site.

A method of sequestering carbon dioxide comprises reacting the carbon dioxide with aqueous magnesium ions at elevated pH to form magnesium carbonate-containing salts. The carbon dioxide is preferably reacted with alkali to form carbonate and/or bicarbonate anions at elevated pH, and the carbonate and/or bicarbonate anions are subsequently reacted with aqueous magnesium cations to form the magnesium carbonate-containing salts. A preferred alkaline material for use in elevating the pH of the aqueous solution in the present invention is Cement Kiln Dust (CKD), and a preferred source of aqueous magnesium ions is reject water from a desalination plant.

The invention concerns: A) An assembly to reduce the emission of CO.sub.2 in a plant for the production of clinkers comprising two calciners and a carbonator arranged between the two calciners, wherein one of the calciners is an integral part of a conventional clinker production system. Thanks to this assembly, the plant can continue to operate in the clinker production process even if the CO.sub.2 capture system which uses the carbonator and the other calciner of the assembly is disconnected due to malfunctions or maintenance characterized in that said carbonator is free of recirculation to both said two calciners. B) The relative plants comprising both the assembly and the actual clinker production plant in which the clinker production plant is of the conventional type existed before and already operational, or said plant is installed simultaneously with the assembly units. C) The clinker production process with reduction of CO.sub.2 emission conducted in the plants B.

Provided is a gas separation membrane 10 including a separation layer 1 which comprises a block copolymer having at least a first segment and a second segment, in which the separation layer 1 has a phase separation structure that has at least a first structure 11 derived from the first segment and a spherical second structure 12 derived from the second segment. The gas separation membrane in which the spherical second structure satisfies Formula 1, the first structure and the spherical second structure satisfy the following Formula 2, and the first structure 11 has a structure that is continuous in the thickness direction over the entire thickness of the separation layer 1 has high gas permeability and high gas separation selectivity. Also provided is a gas separation membrane module.
R/L<0.4Formula 1:
Ps/Pf<1Formula 2: (R represents the average diameter of the spherical second structure, L represents the thickness of the separation layer, Ps represents the permeability coefficient of the first structure, and Pf represents the permeability coefficient of the spherical second structure. In this case, Ps and Pf represent the permeability coefficient of a gas with a higher permeability coefficient in the first structure, among two kinds of gases.)

The invention relates to an absorbent solution for absorbing acid compounds, such as hydrogen sulfide and carbon dioxide, in a gaseous effluent, containing water and a mixture of amines comprising 1,2-bis-(2-dimethylaminoethoxy)-ethane and 2-[2-(2-dimethylaminoethoxy)-ethoxy]-ethanol, of respective formulas (I) and (II) below, and to a method of removing acid compounds contained in a gaseous effluent using this solution. ##STR00001##

Disclosed is a bypass system for use with off gases that have exited a cement kiln utilized in a cement making process. The bypass system is adapted to remove both NOx and volatile components that are present in the off gases while the off gases are in the bypass duct.

An apparatus for and method of removing acidic gas from a gaseous stream and regenerating an aqueous solution allows for the recovery of waste heat of stripping steam and more economical regeneration of the aqueous solution. In at least one embodiment, one or more rich solvent bypasses combine with a rich solvent heat exchanger to recover waste heat. In another embodiment, the apparatus and method include one or more rich solvent bypasses and a heater positioned upstream of the stripper to more economically regenerate an aqueous solution.