chemical conversion

chemical conversion

[′kem·i·kəl kən′vər·zhən]
(computer science)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
ENPNewswire-August 22, 2019--Lithium Australia NL - LieNA opens up lithium chemical conversion opportunities
The hemoglobin molecule that is released into the blood by this process is split, with the heme portion undergoing a chemical conversion to bilirubin.
Sleeplessness causes oxidative stress, and this drives the chemical conversion.'
The remaining 10 percent is a byproduct of the chemical conversion of waste to biodiesel: glycerin.
(TSX: FGE) (OTCQX: FTPLF) has signed a share purchase agreement to acquire all issued and outstanding common shares of Canada-based chemical conversion company S2G Biochemicals Inc.
M2 EQUITYBITES-March 19, 2018-Fortress Global Acquires Canadian Chemical Conversion Company S2G Biochemicals
The spiky surface is likely what made the difference in this case, according to the researchers' initial analysis, since it provided a large number of reactive sites to facilitate the chemical conversion.
Zhang et al., "Corrosion resistance of cerium-doped zinc calcium phosphate chemical conversion coatings on AZ31 magnesium alloy," Transactions of Nonferrous Metals Society of China, vol.
Sen, "Chemical conversion pathways for carbohydrates," Green Chemistry, vol.
Metals, ceramics, and polymers can be modified to have novel properties by surface modification techniques such as electrochemical deposition, chemical conversion, and plasma treatment.

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