Abstract:
A process for the selective removal of sulphur compounds from synthesis gas being rich in carbon monoxide and containing hydrogen, carbon monoxide and containing hydrogen, carbon dioxide and steam comprising contacting the synthesis gas at a maximum contact temperature of 100° C with an absorbent comprising Cu/ZnO compounds and being prepared by thermal decomposition of a corresponding carbonate and activation of the thermal decomposed carbonate with a reducing gas.
Abstract:
A cooled reactor for exothermic catalytic conversion of gaseous materials, e.g. for the oxo synthesis, for the conversion of hydrogen and nitrogen to form ammonia and for the reaction of carbon oxides with hydrogen to form methanol, comprises a cylindrical pressure shell (10), distributor means (34) for synthesis gas, at least one tube sheet (30) and one or more catalyst beds (20) provided with cooling tubes (38) for the indirect cooling of reacting gas. Each cooling tube (38) consists of an outer tube (4) provided with a heat exchanging outer wall (7); this outer tube surrounds and is coaxial with an inner tube (2) and hence defines an annular space the inner wall of which is provided with perforations (8) to direct the stream of cooling gas, which may consist of or contain components of the synthesis gas, to the annular space and along the heat exchanging wall. There is obtained a very rapid equalization of temperature differences in the catalyst bed, which causes an improved yield and hence makes it possible to decrease the amount of catalyst for a given process.
Abstract:
Flue gases etc. may contain SO2 which should be prevented from admission to the atmosphere. SO2 is oxidized to SO3 and condensed with steam to H2SO4-vapours which are condensed in vertical glass tubes cooled from the outside. In principle the condensate is collected near the bottom of the tubes. In the cooling process a mist of very small H2SO4 droplets is formed and tends to escape to the atmosphere. Environmental regulations continually increase the demands on reducing the amount of acid mist escaping. According to the invention an important method to achieve a reduction of the escape of acid mist is to pass the gas leaving each tube through an aerosol filter in gastight connection with the tube top. Such a filter may consist of acid resistant fibres or filaments having a thickness of 0.04-0.7 mm and may be arranged in specified manners to ensure a drop of pressure through below 20 mbar. Moreover, the sulfuric acid caught in the filter is caused to flow downwardly through the tube countercurrently with the feed gas. Various embodiments of filters and filter media for the purpose are disclosed. The sulfuric acid recovered is highly pure and highly concentrated.
Abstract:
Process for preparing urethanes by reacting a solution of a nitrogen-containing organic compound and a hydroxyl-containing organic compound with carbon monoxide in the presence of a ruthenium catalyst. The selectivity of this process is increased by the use of methanol instead of various other alkanols, e.g. ethanol. Preferably the catalyst is a halide-free ruthenium catalyst, e.g. a ruthenium carbonyl complex.
Abstract:
A waste heat boiler has heat exchange tubes for indirect heat exchange of a relatively hot process gas and a cooling media, and a by-pass tube for by-passing a part of the process gas; a process gas collector collects and mixes a part of the heat exchanged process gas and at least a part of the by-passed process gas before the mix is lead via a control valve to the process gas outlet of the waste heat boiler together with the rest of the heat exchanged process gas.
Abstract:
Method and apparatus for separating a liquid reaction product from a gaseous stream in a catalytic reactor by means of a metallic sheet being indirectly cooled by a cooling surface and having a plurality of percolations in form of geometric-shaped protrusions on both sides of the sheet each with an open base, the open base is on the side of the sheet facing a catalyst bed are arranged upwards and on the side facing the cooling surface the open base faces downwards.
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:
When producing ammonia in a conventional ammonia plant there is obtained a substantially improved process economy by incorporating a fuel cell into the ammonia plant. A gas stream rich in carbon dioxide, obtained during the production of ammonia, is passed to the cathode gas loop of the fuel cell; and/or a purged gas stream emanating from the process plant and containing one or more components usable as fuel for the fuel cell is fed to the anode chamber of the fuel cell. Finally, exhaust gas usable as fuel is passed from the anode chamber of the fuel cell to the front end of the process plant. An improved production of electricity is obtained in the fuel cell; and the stream rich in carbon dioxide formed in the ammonia plant is utilized, whereas normally it is a waste product.
Abstract:
Synthetic layered crystalline aluminosilicates which, apart from the possible presence of water of crystallization, have the general formula expressed as moles of oxides ratios: (M2/nO)x : (SiO2)y : (Al2O3)z, where M represents one or more n-valent cations selected amongst sodium, potassium and any other cations capable of replacing sodium or potassium by ion-exchange, the ratio y/z being between 15 and 300, the ratio x/z being determined from the criterion of electron neutrality between anions and cations, and wherein the structural aluminium is tetrahedrally coordinated in crystal lattice, are suitable as catalysts for the preparation of higher hydrocarbons from a raw material containing lower olefins or oxygenates. These aluminosilicates are prepared from a synthesis mixture the composition of which, expressed as moles of oxides, is: SiO2/Al2O3: 5-500, preferably: 10-300; M2/nO/SiO2: 0.1-10, preferably: 0.1-2; OH/SiO2: 0.1-5, preferably: 0.2-4; H2O/SiO2: 5-200, preferably: 5-75. The synthesis mixture is held under autogenous pressure at a temperature of 80-270 DEG C for 4 hours to 100 days, preferably at 95-160 DEG C for 10 hours to 30 days.
Abstract translation:除了可能存在结晶水之外,合成层状结晶硅铝酸盐具有以氧化物摩尔数表示的通式:(M2 / nO)x:(SiO 2)y:(Al 2 O 3)z,其中M表示一个或多个 选自钠,钾和能够通过离子交换替代钠或钾的任何其它阳离子的n价阳离子,比率y / z在15和300之间,x / z是根据阴离子之间的电子中性标准确定的 和阳离子,并且其中结构铝在晶格中四面体配位,适合作为用于由含低级烯烃或含氧化合物的原料制备高级烃的催化剂。 这些铝硅酸盐由合成混合物制备,其组成以氧化物的摩尔数表示,为:SiO 2 / Al 2 O 3:5-500,优选为:10-300; M2 / nO / SiO2:0.1-10,优选:0.1-2; OH / SiO 2:0.1-5,优选0.2-4; H 2 O / SiO 2:5-200,优选5-75。 合成混合物在80-270℃的自生压力下保持4小时至100天,优选在95-160℃保持10小时至30天。
Abstract:
A process for producing a catalyst, comprising the steps of modifying a carrier by a first impregnation with at least one alkaline earth metal in a first metal precursor solution, the first metal precursor being decomposed to form at least one metal oxide or metal hydroxide, thereby obtaining a modified carrier. A second impregnation is carried out by incipient wetness by a second precursor solution comprising at least one metal Me in a second solution. Finally, the second precursor is decomposed, thereby obtaining a catalyst body having an enrichment of the at least one metal Me in the outer shell of the catalyst body, the metal being present in a concentration having either as an egg-shell profile or a hammock profile.