dehydrogenation


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dehydrogenation

[dē¦hī·drə·jə′nā·shən]
(chemistry)
Removal of hydrogen from a compound.

Dehydrogenation

A reaction in which hydrogen is detached from a molecule. The reaction is strongly endothermic, and therefore heat must be supplied to maintain the reaction temperature. When the detached hydrogen is immediately oxidized, two benefits accrue: (1) the conversion of reactants to products is increased because the equilibrium concentration is shifted toward the products (law of mass action); and (2) the added exothermic oxidation reaction supplies the needed heat of reaction. This process is called oxidative dehydrogenation. On the other hand, excess hydrogen is sometimes added to a dehydrogenation reaction in order to diminish the complete breakup of the molecule into many fragments.

The primary types of dehydrogenation reactions are vapor-phase conversion of primary alcohols to aldehydes, vapor-phase conversion of secondary alcohols to ketones, dehydrogenation of a side chain, and catalytic reforming of naphthas and naphthenes in the presence of a platinum catalyst. All four of these types of dehydrogenation reactions are of major industrial importance. They account for the production of billions of pounds of organic compounds that enter into the manufacture of lubricants, explosives, plastics, plasticizers, and elastomers.

References in periodicals archive ?
Table 25: US 10-Year Perspective for Chemical Processing Catalysts by Product Segment - Percentage Breakdown of Dollar Sales for Polymerization Catalysts, Oxidation Catalysts, Organic Synthesis Catalysts, Synthesis Gas Catalysts, Hydrogenation Catalysts and Dehydrogenation Catalysts Markets for 2003, 2008 & 2012 (includes corresponding Graph/Chart) III-13
The acidic environment created by these gases results in the enhancement of dehydrogenation and cyclization reactions.
y]) and/or the formation of diborane during the hydrogenation and dehydrogenation cycles.
The focus of this study is on metallic copper foam which is characterized and evaluated as a catalyst for ethanol dehydrogenation to acetaldehyde and hydrogen.
today announced that a consortium of its Shaw Stone & Webster unit and CTCI Corporation of Taiwan, Republic of China, has been awarded a contract to provide engineering, procurement, construction and commissioning (EPCC) services for a new propane dehydrogenation (PDH) plant in Thailand.
Such linear molecules may also undergo cyclization and dehydrogenation reactions and ultimately form coke in the presence of silicate mineral.
This plant tested the possibility of one-step dehydrogenation of isopentane into isoprene using the equipment for the butadiene production.
It will be a propane dehydrogenation plant in Tarragona, a port city in northern Spain, to produce about 350,000 t/y of propylene.
IRVING, Texas -- Fluor Corporation (NYSE: FLR) announced today that it was awarded a contract by Williams (NYSE: WMB) to provide preliminary engineering services for a proposed propane dehydrogenation (PDH) project near Redwater, Alberta, Canada.
Gulf Coast, Dow is in the process of starting up its propane dehydrogenation (PDH) plant, and plans to complete its world-scale cracker and derivatives project by 2017.
The most important of the on-purpose technologies for the production of propylene is the dehydrogenation of propane (PDH technology).