chemical conversion

chemical conversion

[′kem·i·kəl kən′vər·zhən]
(computer science)

Chemical conversion

A chemical manufacturing process in which chemical transformation takes place, that is, the product differs chemically from the starting materials. Most chemical manufacturing processes consist of a sequence of steps, each of which involves making some sort of change in either chemical makeup, concentration, phase state, energy level, or a combination of these, in the materials passing through the particular step. If the changes are of a strictly physical nature (for example, mixing, distillation, drying, filtration, adsorption, condensation), the step is referred to as a unit operation. If the changes are of a chemical nature, where conversion from one chemical species to another takes place (for example, combustion, polymerization, chlorination, fermentation, reduction, hydrolysis), the step is called a unit process. Some steps involve both, for example, gas absorption with an accompanying chemical reaction in the liquid phase. The term chemical conversion is used not only in describing overall processes involving chemical transformation, but in certain contexts as a synonym for the term unit process. The chemical process industry as a whole has tended to favor the former usage, while the petroleum industry has favored the latter. See Chemical process industry, Unit processes

Another usage of the term chemical conversion is to define the percentage of reactants converted to products inside a chemical reactor or unit process. This quantitative usage is expressed as percent conversion per pass, in the case of reactors where unconverted reactants are recovered from the product stream and recycled to the reactor inlet. See Chemical engineering

References in periodicals archive ?
Aetd Type,(Adhesive,Release Agent,Grease,Adhesive,(Adhesive,Retaining Compound,(Retaining Compound,(Adhesive,Adhesive,Adhesive,Cleaner,Grease,Grease,(Cement,(Cement,Lubricant,(Adhesive,(Adhesive, (Adhesive,Barrier Material,(DyChromate Conversation Coating,) Chemical Conversion Coating, (DyC leaning Compound,(D) Cleaning Compound,(DyCleaning Compound, Catalyst,Thinne r,Primer,Corrosion Preventive Compound,(DyCorrosion Preventive Compound, (DyCorrosion Preventive,Compound,(DyCorrosion Preventive Compound,(DyCorrosion Preventive Compound,(DyCorrosion Preventive Compound,(D)Polish Compound,(DyProtectivc Coating,(D) Corrosion Removing Compound,(DyCorrosion Preventive
The organization specializes in the development of the theory of chemical conversion, kinetics and a mechanism of complex chemical reactions proceeding with a participation of free radicals and atoms, including chain reaction as well as combustion and explosion in the gas and condensed phases.
Mechanically activated chemical conversion of gaseous hydrocarbons.
The sales engineer's primary responsibility is to help coordinate sales quotes for casting, machining, and all secondary operations such as machining and chemical conversion.
Remember, in the aerobic energy system, oxygen is required to create the chemical conversion of glucose and glycogen into useable fuel.
He holds 20 patents in the area of catalysis and chemical conversion of biomass to chemicals.
Gale brings over 20 years of experience directing research operations in combustion, gasification, and chemical conversion test environments for exploration and assessment of new technologies on a variety of environmental products addressing NOx, SOx, CO2, and mercury emissions, along with alternative fuels and advanced power systems.
In the paper, the chemical engineers call for a greater integration of energy sources and urge policymakers to consider chemical conversion processes as a potential method to produce cleaner and cheaper fuels.
The sugars were then converted to fuel using Virent's chemical conversion process.
In this structure, the light penetrates the entire reaction medium and triggers the chemical conversion process with optimum efficiency.
It may also be applied directly to metal using a chemical conversion coating per MIL-C5541.
Ideally, the process to be followed is cleaning the substrate and profiling it to maximize mechanical adhesion, followed by a chemical conversion of the substrate surface to slow oxidization and improve adhesion.

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