| http://www.w3.org/ns/prov#value | - While not wishing to be bound by theory, it is believed that the reaction is thermodynamically unfavored, but can be displaced by removal of the hydrogen halide via distillation of thehydrogen halide azeotrope with water and any solvent that forms a ternary azeotrope with a hydrogen halide and water such as benzene, toluene, heptane or octane when the excess sulfuric acid or phosphoric acid concen
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