Abstract: A method and system for processing an input fuel gas and steam to produce separate CO2 and output fuel gas streams. The method comprises the steps of using a decarbonizer segment for reacting at least a solid sorbent with the fuel gas and steam to remove carbon from the input fuel gas and to produce the output fuel gas stream in an exhaust gas from the decarbonizer; using a calciner segment for reacting the solid sorbent from the decarbonizer segment therein to release the CO2 into the CO2 gas stream; wherein CO2 partial pressures and temperatures in the decarbonizer and calciner segments respectively are controlled such that the temperature in the decarbonizer segment is higher than the temperature in the calciner.

Abstract: A method and system for processing an input fuel gas and steam to produce separate CO2 and output fuel gas streams. The method comprises the steps of using a decarbonizer segment for reacting at least a solid sorbent with the fuel gas and steam to remove carbon from the input fuel gas and to produce the output fuel gas stream in an exhaust gas from the decarbonizer; using a calciner segment for reacting the solid sorbent from the decarbonizer segment therein to release the CO2 into the CO2 gas stream; wherein CO2 partial pressures and temperatures in the decarbonizer and calciner segments respectively are controlled such that the temperature in the decarbonizer segment is higher than the temperature in the calciner.

Abstract: A method of removing CO2 from an input gas stream, the method comprising reacting a solid sorbent with the input gas stream to remove CO2 from the input gas stream in a carboniser; reacting the solid sorbent from the carboniser in a calciner to release the CO2 into a substantially pure gas stream; exchanging heat between the carboniser and calciner; and controlling a CO2 partial pressure and temperature in the carboniser and a CO2 partial pressure and temperature in the calciner such that the temperature in the carboniser is higher than the temperature in the calciner for providing heat from the carboniser to the calciner.

Abstract: New cement binders characterised by including: 30-80% by weight of a first component having MgO and at least one magnesium carbonate having the general formula: w MgC03.x MgO.y Mg(OH)2.z H2O (A) in which w is a number equal to or greater than 1; at least one of x, y or z is a number greater than 0 and w, x, y and z may be (but need not be) integers and 20-70% by weight of a second component including a least one silicon and/or aluminium oxide containing material are disclosed. They can be used to produce building materials (cements, mortars, grouts and the like) having improved structural properties relative to prior art materials. In particular, their manufacture is less energy intensive than e.g. Portland cement making them environmentally friendly in the sense that processes for their manufacture have a relatively low carbon footprint.

Abstract: A method of removing CO2 from an input gas stream, the method comprising reacting a solid sorbent with the input gas stream to remove CO2 from the input gas stream in a carboniser; reacting the solid sorbent from the carboniser in a calciner to release the CO2 into a substantially pure gas stream; exchanging heat between the carboniser and calciner; and controlling a CO2 partial pressure and temperature in the carboniser and a CO2 partial pressure and temperature in the calciner such that the temperature in the carboniser is higher than the temperature in the calciner for providing heat from the carboniser to the calciner.

Abstract: A system and System for removing CO2 from an input gas stream. The system comprises a carboniser segment configured such that a solid sorbent reacts therein with the input gas stream to remove CO2 from the input gas stream; a calciner segment configured such that the solid sorbent from the carboniser segment reacts therein to release the CO2 into a substantially pure gas stream; a heat exchanger unit for exchanging heat between the carboniser and calciner segments; a first conditioning unit for controlling a CO2 partial pressure in the carboniser segment; and a second conditioning unit for controlling a CO2 partial pressure in the calciner segment; wherein the first and second conditioning units are configured such that a difference between the CO2 partial pressures in the carboniser and calciner segments respectively is controlled such that heat is provided from the carboniser to the calciner through the heat exchanging unit.

Abstract: A process for producing a cement binder composition including one or more magnesium carbonates having the general formula w MgCO3. x MgO. y Mg(OH)2 . z H2O in which w is a number equal to or greater than 1, at least one of x, y and z is a number greater than 0 and w, x, y and z may be (but need not be) integers is described. The process is characterised by (a) heating magnesite to liberate carbon dioxide gas and produce a solid product including magnesium oxide and (b) contacting an aqueous mixture including the magnesium oxide produced in step (a) with a source of carbonate ions at a temperature in the range 25 to 120° C. to produce at least one of the magnesium carbonates.

Abstract: A system and method for extracting carbon dioxide from an industrial source of flue gas at atmospheric pressure. The system comprises means for conditioning the flue gas for entry into a compressor unit; the compressor unit being adapted compressing the conditioned flue gas; a heater unit for heating the compressed flue gas; an expander unit for expanding the heated compressed flue gas for generating power; and a separator unit for separating Carbon Dioxide from the heated compressed flue gas.

Abstract: A method and system for processing an input fuel gas and steam to produce separate CO2 and output fuel gas streams. The method comprises the steps of using a decarboniser segment for reacting at least a solid sorbent reacts with the fuel gas and steam to remove carbon from the input fuel gas and to produce the output fuel gas stream in an exhaust gas from the decarboniser; using a calciner segment for reacting the solid sorbent from the decarboniser segment therein to release the CO2 into the CO2 gas stream; wherein CO2 partial pressures and temperatures in the decarboniser and calciner segments respectively are controlled such that the temperature in the decarboniser segment is higher than the temperature in the calciner.