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A homogeneous one-dimensional reactor model was used to study and compare two oxidation processes: (1) ethylene oxidation to ethylene oxide and (2) o-xylene oxidation to phthalic anhydride.
First, the base-case design was obtained, resulting in the production of ethylene glycol via two steps: ethylene oxidation synthesis followed by ethylene oxide hydration to produce ethylene glycol.
In this model, we assume that oxidation reactions take place on different sites; ethane oxidation takes place on one site, ethylene oxidation on another site, and CO is oxidized to CO2 on a third site.
It is shown that the gas phase oxidation of ethylene is inhibited by these solids, suggesting that one of the role of the catalyst in oxidative coupling of methane is to inhibit ethylene oxidation into COx by trapping very reactive chain-carriers.
Similar results were observed during ethylene oxidation.
Let Y be a catalytic center for ethylene oxidation to acetic acid.
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Ethylene oxide oxidation in these conditions was modeled using a comprehensive kinetic reaction mechanism.
The synthesis of ethylene oxide by direct oxidation with air or oxygen over a supported silver catalyst is a well established process for more than sixty years.
Major industrial uses of ethylene include (a) polymerization to polyethylene and other copolymers; (b) oligomerization to normal alpha-olefins; (c) oxidation to ethylene oxide and acetaldehyde; (d) halogenation and dehydrohalogenation to vinyl chloride; (e) alkylation of benzene to ethylbenzene; and (f) hydroformylation to propionaldehyde [1, 2, 3].
In ethylene glycol oxidation, partial oxidation to glycolate was much faster than complete oxidation to CO2.
Three reaction systems were used: the oxidation of benzene to maleic anhydride, the oxidation of naphthalene to phthalic anhydride, and the oxidation of ethylene to ethylene oxide.
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