Abstract:
Process for the production of concentrated sulphuric acid and oleum from feed gases with up to 70 % SO 2 + SO 3 (SO x ) and a content of H 2 O corresponding to H 2 O/SO 3 molar ratios up to 1.6, particularly in the range of 0.5 to 1.6 upstream an intermediate sulphuric acid condenser comprising an air recycling loop with water addition. The process of the invention minimizes power consumption of the sulphuric acid plant by reducing the consumption of cooling water and obtaining maximum possible recovery of the heat liberated in the process for production of high pressure steam for power production. Up to 99.95% of the SO x in the feed gas can be recovered as typically 98.5-99.5 wt% concentrated sulphuric acid and/or oleum with up to 25 wt% SO 3 .
Abstract:
Improved design of a catalytic reactor for the production of methanol at equilibrium conditions whereby methanol as it is formed is separated from the gaseous phase into the liquid phase within the reactor, without reducing the catalytic activity of the methanol catalysts This is achieved by adjusting the boiling point of a liquid cooling agent being in indirect contact with the catalyst particles and by providing a specific ratio of catalyst bed volume to cooling surface area. Thereby, condensation of methanol as it is formed in the gaseous phase takes place at the cooling surface arranged evenly distributed within the reactor and within a very limited region of the catalyst bed.
Abstract:
Process for the production of acetic acid comprising the steps of: (a) passing a feed stream containing ethanol and water together with a predetermined feed rate of an oxygen containing atmosphere in presence of one or more catalysts being active in simultaneous non-oxidative and oxidative conversion of ethanol to a product stream with acetic acid; (b) recovering from the product stream a stream of acetic acid; (c) optionally recovering reactive derivatives of acetic acid and recycling these to step (a). A reactor for use in the process comprises a first and at least a second fixed catalyst bed with a catalyst being active in simultaneous non-oxidative and oxidative conversion of ethanol to acetic acid; inlet means for a fed stream comprising ethanol, water and a first portion of an oxygen containing atmosphere to the first catalyst bed; between the first and at least second catalyst bed inlet means for a second portion of the oxygen containing atmosphere and means for distributing and mixing the second portion of the oxygen containing atmosphere into an effluent of partly converted feed stream from the first catalyst bed; and means for passing the partly converted feed stream and admixed with the oxygen containing atmosphere into the at least second catalyst bed.
Abstract:
Process for the preparation of dimethyl ether by catalytic conversion of synthesis gas to dimethyl ether comprising contacting a stream of synthesis gas comprising carbon dioxide with one or more catalysts active in the formation of methanol and the dehydration of methanol to dimethyl ether, to form a product mixture comprising the components dimethyl ether, carbon dioxide and unconverted synthesis gas, washing the product mixture comprising carbon dioxide and unconverted synthesis gas in a first scrubbing zone with a first solvent rich in dimethyl ether and subsequently washing the effluent from the first scrubbing zone in a second scrubbing zone with a second solvent rich in methanol to form a vapour stream comprising unconverted synthesis gas stream with reduced content of carbon dioxide, transferring the vapour stream comprising unconverted synthesis gas stream with reduced carbon dioxide content for further processing to dimethyl ether.
Abstract:
The invention provides a method for removing impurities in exhaust gas from a diesel engine, where the impurities comprise nitrogen oxides, carbon monoxide, particulate matter and incompletely combusted hydrocarbons. The method comprises the steps of injection of a reductant comprising urea or ammonia into the exhaust gas from the engine, selective catalytic reduction of the nitrogen oxides in the exhaust gas by the reductant, and intermittent injection of a hydrocarbon into this effluent. The succeeding steps are oxidation of carbon monoxide, particulate matter, incompletely combusted hydrocarbons and injected hydrocarbon to carbon dioxide and water, and in selectively oxidising possible excess of reductant to free nitrogen, and finally filtration of the effluent by passing the gas through a catalysed filter, wherein the remaining particulate matter is retained in the filter, and wherein the carbon monoxide, particulate matter and hydrocarbons are oxidised to carbon dioxide and water, and the reductant is selectively oxidised to nitrogen, creating a purified exhaust gas.
Abstract:
Reforming reactor for the conversion of a process fluid into hydrogen comprising: a reforming section (4) which is contained within a closed volume (8), a boiler section (3) and a combustion section (2), in which said reforming section contains one or more catalyst tubes (20) filled with reforming catalyst, said boiler section is provided with one or more flow channels (11) for the passage of flue gas from the combustion section and said combustion section is provided with at least one burner (1), wherein the heat exchanging medium required for the reforming of said process fluid in the one or more catalyst tubes is a gas-liquid mixture that self-circulates and is encapsulated inside said closed volume (8) and wherein at least a portion (9) of said closed volume protrudes inside said boiler section.
Abstract:
Process for the recovery of sulfuric acid comprising: (a) contacting a stream containing sulfuric acid vapor and/or sulfur trioxide in an absorption stage with a ionic liquid absorbent, (b) withdrawing a gas substantially free of sulfuric acid vapor and/or sulfur trioxide from said absorption stage, (c) withdrawing a stream comprising the ionic liquid absorbent from said absorption stage, in which said ionic liquid absorbent contains sulfuric acid, (d) recovering sulfuric acid from said ionic liquid absorbent by passing the stream of step (c) through a separation stage, (e) withdrawing from the separation stage (d) a stream rich in sulfuric acid, (f) withdrawing from the separating step (d) a ionic liquid absorbent stream in which said ionic liquid absorbent contains sulfuric acid and returning said stream to the absorption step (a).