摘要:
Disclosed is a process and an adsorbent for the separation of ethanol associated oxygenates from a dilute mixture of ethanol and associated oxygenates in water in the presence of organic compounds derived from a biofermentation process. After pretreatment, the separation is carried out in a simulated moving bed adsorption system employing an stationary phase adsorbent comprising fluorinated carbon or modified C18 silica gel selective for the adsorption of ethanol and associated oxygenates, such as 2,3-butanediol, with a mobile phase desorbent selected from the group consisting of methanol, ethanol, propanol, and methyl tertiary butyl ether. The process is useful for removing water from dilute aqueous mixtures of organic compounds comprising ethanol in dilute concentration in water and produced by fermentation, biomass extraction, biocatalytic and enzymatic processes which are not economically recoverable by conventional distillation methods.
摘要:
Disclosed is a process for the production of d-mannose from fermented palm oil kernel meal using a continuous SMB separation process. The process is useful for providing a simplified processing route to providing high purity d-mannose. The SMB process and the SMB cycle was operated to provide a high purity mannose stream comprising d-mannose, salts, and color agents, a primary raffinate comprising glucose, other sugars and salts, and a secondary raffinate consisting essentially of the mobile phase desorbent. In the SMB cycle, the secondary raffinate was recycled to the SMB process as the mobile phase desorbent without further desalination. The highly pure mannose stream was further treated to remove color agents and salts prior to subsequent steps of precipitation or crystallization and drying. D-mannose is useful as a food additive, as a sweetener, as a texturizer, as a stabilizer, or as a humectant.
摘要:
A device is disclosed for the generation of hydrogen peroxide. The device produces hydrogen peroxide on an as-needed basis through the use of electrolysis of water, wherein the hydrogen and oxygen are mixed in the electrolyzer, and the hydrogen and oxygen mixture in water are reacted in a reactor to produce hydrogen peroxide.
摘要:
A device is disclosed for the generation of hydrogen peroxide. The device produces hydrogen peroxide on an as-needed basis through the use of electrolysis of water, wherein the hydrogen and oxygen are mixed in the electrolyzer, and the hydrogen and oxygen mixture in water are reacted in a reactor to produce hydrogen peroxide.
摘要:
A process and apparatus are disclosed for the generation of hydrogen from hydrogen rich compounds. The process uses hydrogen peroxide as an oxidizer with a hydrogen rich compound forming a mixture such that when the mixture is exposed to a catalyst forming a hydrogen rich gas.
摘要:
A multiport rotary valve is described providing the interconnection of a plurality of conduits with a predetermined cycle. The valve uses a stack of plates defining channels and ports to form the fluid circuits.
摘要:
An apparatus is presented for separating chemicals using adsorption separation methods. The apparatus uses a plurality of adsorption units holding adsorbent, where the adsorption units positioned in a cylindrical spool, are serially connected and the spool is rotated to shift the relative position of the feeds and drawoffs to the apparatus.
摘要:
A process and apparatus are disclosed for the operation of a fuel cell to generate electric power from a feed stream comprising a hydrocarbon or an alcohol. The fuel cell comprises a proton exchange membrane which produces electric power from a hydrogen product stream which comprises essentially no carbon monoxide. The hydrogen product stream is produced from the feed stream in a novel steam reforming zone containing a steam reforming catalyst disposed in a bell-shaped catalyst zone. The bell-shaped catalyst zone is disposed over a combustion zone such that the exhaust gas from the combustion flows around the bell-shaped catalyst zone to heat the catalyst from the inside and the outside of the catalyst zone. Furthermore, the bell-shaped catalyst zone maintains a high inlet and a high outlet temperature to avoid methane slippage in the steam reforming zone. Heat for the steam reforming zone is provided by a fuel stream and at least a portion of the anode waste gas stream from the fuel cell.
摘要:
A channel reactor arrangement and a process uses a heat exchange fluid with a high thermal density to indirectly heat or cool the reactants by indirect heat exchange. The system brings the efficiency of plate reactor arrangements to the effectiveness of high heat capacity heat exchange fluids such as molten salts and liquid metals. The channel reactor arrangement maintains a limited temperature gradient through the channels at all points to improve process selectivity. This type of arrangement is of a particular advantage where the reaction zone uses a heterogeneous catalyst system within a heat exchanging reaction section. The plate and channel heat transfer arrangement is particularly beneficial because of its high surface area provided per unit volume of channels. The high surface area of plates is particularly beneficial for heat transfer fluids having a high thermal density since the mass flow of the fluid, for lower thermal density fluids, will often end up being the limiting heat input variable where the approach temperature between the heat exchange channels and reaction channels is limited. Highly exothermic processes such as oxidation reactions or endothermic processes such as dehydrogenation achieve the most benefit from this invention.
摘要:
A process for the alkylation of aromatic compounds with an olefin or alkyl halide having from 1 to 24 carbon atoms utilizes a novel catalyst comprising: a) a refractory inorganic oxide, b) the reaction product of a first metal halide and bound surface hydroxyl groups of the refractory inorganic oxide, c) a second metal cation, and d) optionally a zerovalent third metal. The refractory inorganic oxide is selected from the group consisting of alumina, titania, zirconia, chromia, silica, boria, silica-alumina, and combinations thereof and the first metal halide is a fluoride, chloride, or bromide of aluminum, gallium, zirconium, or boron. The second metal cation is selected from the group consisting of: monovalent metal cations in an amount from 0.0026 up to about 0.20 gram atoms per 100 grams refractory inorganic oxide for lithium, potassium, cerium, rubidium, silver, and copper, and from 0.012 to about 0.20 gram atoms for sodium; and alkaline earth metal cations in an amount from about 0.0013 up to about 0.01 gram atoms per 100 grams of refractory inorganic oxide for beryllium, strontium, and barium, and in an amount from about 0.004 up to about 0.1 gram atoms per 100 grams support for magnesium and calcium, or combinations thereof. The third metal is selected from the group consisting of platinum, palladium, nickel ruthenium, rhodium, osmium and iridium, and any combination thereof. These novel catalysts are effective in other alkylation reactions including motor fuel alkylation.