Search results
Results from the WOW.Com Content Network
The Dow process is the electrolytic method of bromine extraction from brine, and was Herbert Henry Dow's second revolutionary process for generating bromine commercially. This process was patented in 1891. In the original invention, bromide-containing brines are treated with sulfuric acid and bleaching powder to oxidize bromide to bromine ...
The basic steps in any free-radical process ... to regenerate the monatomic bromine and continue the reaction. [3]: ... between the two propagation steps. [3]: ...
The relative rates at which different halogens react vary considerably: [citation needed] fluorine (108) > chlorine (1) > bromine (7 × 10 −11) > iodine (2 × 10 −22).. Radical fluorination with the pure element is difficult to control and highly exothermic; care must be taken to prevent an explosion or a runaway reaction.
Herbert Henry Dow (February 26, 1866 – October 15, 1930) was an American chemical industrialist who founded the American multinational conglomerate Dow Chemical.A graduate of the Case School of Applied Science in Cleveland, Ohio, he was a prolific inventor of chemical processes, compounds, and products, notably bromine extraction from sea water, and was a successful businessman.
The Dow process may refer to: Dow process (bromine), a method of bromine extraction from brine; Dow process (magnesium), a method of magnesium extraction from brine;
High bromine concentrations: r(a/s) = k 2a /k 2s (1 + k 4a /k 3a [Br 2]) where r(a/s) is the ratio of addition to substitution, and the k values correspond to constants describing the specific reaction steps pictured above under Competing Pathways.
The US supplied 29 percent of world production. Since 2007, all US bromine has been produced by two companies in southern Arkansas, which extract bromine from brine pumped from the Smackover Formation. At an advertised price of US$3.50 to US$3.90 per kg, the US 2013 US production would have a value of roughly US$800 million.
H• + Br 2 → HBr + Br• the sum of these two steps corresponds to the overall reaction H 2 + Br 2 → 2 HBr, with catalysis by Br• which participates in the first step and is regenerated in the second step. Retardation (inhibition) H• + HBr → H 2 + Br• this step is specific to this example, and corresponds to the first propagation ...