Abstract:
A hydrogen generating system and a method of in situ hydrogen generation controlled on demand capable of reacting an aluminum-free metal reagent composed of at least one of alkali metals, alkaline earth metals, alkali metal alloys and blends including alkali metals, alkaline earth metal alloys and blends including alkaline earth metals and metal alloys including at least one alkali metal and at least one alkaline earth metal, with water to obtain hydrogen and a residual reaction product including metal hydroxide composed of at least one of alkali hydroxides and alkaline earth hydroxide; and separating hydrogen from the residual reaction product; liquefying the metal reagent by heating to obtain liquid metal reagent under vacuum conditions; injecting the liquid metal reagent into a reactor by metal reagent injecting means and simultaneously injecting, by water injection system, a stoichiometric amount of water with respect to the amount of the liquid metal reagent being injected into the reactor such that a controlled metal reagent/water ratio is maintained in the reactor; transferring hydrogen and the residual reaction product from the reactor to separation means; separating hydrogen from the residual reaction product; transferring separated hydrogen to hydrogen receiving means and transferring the residual reaction product to metal hydroxide receiving means, keeping the metal reagent injecting means water injection system, the reactor, the separating means and the hydrogen receiving means free of oxygen by selectively providing a vacuum in the system.
Abstract:
Reactors for carrying out a chemical reaction, as well as related components, systems and methods are provided. In accordance with one embodiment, a reactor is provided that includes a furnace and a crucible positioned for heating by the furnace. A downtube is disposed at least partially within the interior crucible along an axis. At least one structure is coupled with the downtube and extends substantially across the cross-sectional area of the interior volume taken in a direction substantially perpendicular to the axis. A plurality of holes is formed in the structure enabling fluid flow therethrough. The structure coupled with the downtube may include a lower body portion and an upper body portion coupled with the lower body portion, wherein the plurality of holes is formed in the lower body portion adjacent to, and radially outward from, a periphery of the upper body portion.
Abstract:
Reactors for carrying out a chemical reaction, as well as related components, systems and methods are provided. In accordance with one embodiment, a reactor is provided that includes a furnace and a crucible positioned for heating by the furnace. The crucible may contain a molten salt bath. A downtube is disposed at least partially within the interior crucible along an axis. The downtube includes a conduit having a first end in communication with a carbon source and an outlet at a second end of the conduit for introducing the carbon material into the crucible. At least one opening is formed in the conduit between the first end and the second end to enable circulation of reaction components contained within the crucible through the conduit. An oxidizing material may be introduced through a bottom portion of the crucible in the form of gas bubbles to react with the other materials.
Abstract:
The invention relates to a reactor (1) and a process for continuously preparing H2S by converting a reactant mixture which comprises essentially gaseous sulfur and hydrogen over a catalyst, comprising a sulfur melt (9) at least in a lower subregion (8) of the reactor (1), into which gaseous hydrogen is introduced. The catalyst is arranged in at least one U-shaped tube (21) which is partly in contact with the sulfur melt (9), the at least one U-shaped tube (21) having at least one entry orifice (23) on a limb (26) above the sulfur melt (9), through which the reactant mixture can enter the U-shaped tube (21) from a reactant region (10) of the reactor (1), having a flow path within the at least one U-shaped tube, along which the reactant mixture can be converted in a reaction region comprising the catalyst (22), and having at least one exit orifice (24) in another limb (27) through which a product can exit into a product region (7).
Abstract:
A system for producing hydrogen gas from water decomposition using a thermochemical CuCl cycle, the improvement comprising the use of an insulated hydrogen production reactor comprising a reaction chamber and a separation chamber; the reaction chamber having a hydrogen chloride gas inlet and a solid copper inlet; one or more levels provided in the reaction chamber, the number of which is dependant on production scale and pressure drop; each level comprising a perforated plate with associated filter media, the perforations of the plate and media being of decreasing size from top to bottom of the reaction chamber, and being sized to permit downward flow of the hydrogen gas and molten CuCl products, as well as the HCL gas reactant, and to prevent entrainment of solid copper in the molten CuCl; the separation chamber being located below the reaction chamber and being of greater cross section than the reaction chamber and comprising a first hydrogen removal and entrained copper removal zone and a second molten CuCl removal zone; removal of the reaction products being controlled so as to substantially decrease the amount of entrained copper in the molten CuCl; and the first zone having outlets for removal of hydrogen gas and entrained copper particles, with the second zone having an outlet for removal of molten CuCl.
Abstract:
A molten metal reactor quickly entrains a feed material in the molten reactant metal and provides the necessary contact between the molten reactant metal and the feed material to effect the desired chemical reduction of the feed material. The reactor includes a unique feed structure adapted to quickly entrain the feed material into the molten reactant metal and then transfer the molten reactant metal, feed material, and initial reaction products into a treatment chamber. A majority of the desired reactions occur in the treatment chamber. Reaction products and unspent reactant metal are directed from the treatment chamber to an output chamber where reaction products are removed from the reactor. Unspent reactant metal is then transferred to a heating chamber where it is reheated for recycling through the system.
Abstract:
The invention relates to a high pressure method for producing pure melamine by pyrolyzing urea in a vertical synthesis reactor. The synthesis reactor has three stages above one another: a) in the first stage, the smaller portion of the total amount of urea is introduced into the central tube of a first tank reactor forming a first melamine-containing reaction medium; b) in the second stage, the first melamine-containing reaction medium and the larger portion of the total amount of urea is introduced into the central tube of a second tank reactor forming a second melamine-containing reaction medium; c) in the third stage, the second melamine-containing reaction medium is introduced into a vertical tubular flow reactor forming a raw melamine melt that is processed to obtain pure melamine.
Abstract:
The invention relates to an apparatus for continuous slag treatment of molten silicon for removal of one a more impurity elements from the silicon, the apparatus comprising a vessel (1) intended to contain molten silicon and liquid slag. The vessel (1) has an upwardly extending overflow (4) for slag connected to an outlet opening (3) for slag is the bottom (2) of the vessel, a open-ended pipe (5) arranged about and at a distance from the overflow (4) such than there is an annulus between the pipe (5) and the overflow (4), which pipe (5) extends upwards to a level above the top of the overflow (4) and downwards to the bottom (2) of the vessel, the pipe (5) having at least one opening (6) at the bottom of the vessel (1) a closeable outlet opening (8,9) for treated silicon in the sidewall of the vessel, means (14) for supply of heat energy to the vessel, means for intermittent supply of solid or molten silicon to vessel and means for continuous of substantially continuous supply of solid or liquid slag to the top of the vessel.
Abstract:
Foamed polycrystalline silicon having bubbles therein and an apparent density of 2.20 g/cm3 or less. This silicon generates an extremely small amount of fine grains by crushing and can be easily crushed. There is also provided a method of producing foamed polycrystalline silicon. There is further provided a polycrystalline silicon production apparatus in which the deposition and melting of silicon are carried out on the inner surface of a cylindrical vessel, a chlorosilane feed pipe is inserted into the cylindrical vessel to a silicon molten liquid, and seal gas is supplied into a space between the cylindrical vessel and the chlorosilane feed pipe.
Abstract translation:具有气泡的发泡多晶硅,表观密度为2.20g / cm 3以下。 该硅通过粉碎产生极少量的细晶粒,并且可以容易地粉碎。 还提供了一种生产泡沫多晶硅的方法。 还提供了一种多晶硅制造装置,其中硅的沉积和熔化在圆柱形容器的内表面上进行,氯硅烷进料管被插入到硅熔融液体的圆柱形容器中,并且供给密封气体 进入圆筒容器和氯硅烷进料管之间的空间。