Fridman V.Z.,Sud-Chemie, Inc.
Applied Catalysis A: General | Year: 2010
Reaction pathways of the light hydrocarbons formation during propane and isobutane dehydrogenation on Al-Cr catalyst have been studied. It was determined that the majority of light compounds are formed not directly from initial paraffin, but from the main product of the paraffin dehydrogenation; olefin. The sequence of the light compounds formation reactions includes: (1) dehydrogenation of the initial paraffin with formation of targeted olefin; (2) consecutive hydrocracking of the newly produced main olefin with formation of the one carbon shorter chain olefin and methane; (3) one carbon shorter chain olefin can be converted by two parallel reactions further. The first reaction is hydrogenation of the one carbon shorter chain olefin to the formation of the one carbon shorter chain paraffin. Another parallel reaction is hydrocracking of the one carbon shorter olefin to the two carbon shorter olefin and methane. If short olefin is ethylene the final product of the hydrocracking reaction is methane. This sequence can be presented by using isobutane dehydrogenation as an example which also includes steps of light compounds formation from C3 hydrocarbons:(1)C4H10 → C4H8 + H2(2)C4H8 + H2 → C3H6 + CH4(3a)C3H6 + H2 → C3H8(3b)C3H6 + H2 → C2H4 + CH4(4a)C2H4 + H2 → C2H6(4b)C2H4 + 2H2 → 2CH4. Obtained reaction pathways of light compounds formation can be applied to optimize the concept of the dehydrogenation process and explain puzzling phenomena regarding the temperature profile in the fixed bed dehydrogenation process. © 2010 Elsevier B.V. All rights reserved.
Süd-Chemie, Inc. | Date: 2010-12-06
A catalyst for hydrogenating aldehydes to alcohols includes a combination of copper oxide and zinc oxide and promoters including one or more alkaline earth metal promoters and/or one or more transition metal promoters. The promoters may be combined with copper oxide and zinc oxide after formation of a copper/zinc precursor material.
Süd-Chemie, Inc. | Date: 2010-03-03
A process for converting a sugar, sugar alcohol, or glycerol to a valuable chemical is described. The process may use a support comprising zirconium oxide promoted by a polyacid or promoter material. A catalytically active metal may be impregnated on the polyacid-promoted zirconium oxide support and the catalyst may then be introduced the sugar, sugar alcohol, or glycerol a source of hydrogen under reaction conditions. At least 40 wt % of the sugar, sugar alcohol or glycerol may be converted to a polyol and/or a shorter carbon-chain alcohol that may include at least one of propylene glycol, ethylene glycol, glycerin, methanol, ethanol, propanol and butandiols. Specific processes for converting glycerin having a selectivity for propylene glycol and for converting sorbitol with a selectivity for propylene glycol, ethylene glycol, and/or glycerin are also described.
Süd-Chemie, Inc. | Date: 2011-06-27
The present invention is an improved cyclic, endothermic hydrocarbon conversion process and a catalyst bed system for accomplishing the same. Specifically, the improved process comprises reacting a hydrocarbon with a multi-component catalyst bed in such a manner that the temperature within the catalyst bed remains within controlled temperature ranges throughout all stages of the process. The multi-component catalyst bed comprises a reaction-specific catalyst physically mixed with a heat-generating material.
Süd-Chemie, Inc. | Date: 2010-03-03
A polyacid-promoted, zirconia catalyst or catalyst support having a high crush strength, surface area and pore volume is described. The polyacid-promoted, zirconia catalyst or catalyst support may be made by combining a zirconium compound with a polyacid/promoter material that includes the group 6 metals (i.e., chromium (Cr), molybdenum (Mo), tungsten (W)), as well as phosphoric acids, sulfuric acids, and polyorganic acids. The zirconyl-promoter precursor may be extruded in the absence of any binder or extrusion aid. The polyacid-promoted, zirconia catalyst or catalyst support is hydrothermally stable in aqueous phase hydrogenation or hydrogenoloysis reactions.