Disproportionation of hypobromite to bromate

Species

In the processes

• Carbon tetrabromide by semi-batch haloform bromination of acetone in aqueous hypobromite (314 t/a)Concept · not reviewed

  DISP · Disproportionation of hypobromite to bromate3 NaBrO → NaBrO3 + 2 NaBr

  Stated as

  Rate law

  Phase

  liquid

  Element balance

  Balances in every element

  Heat of reaction

  ΔH = -26,800 kJ/kmol at 298.15 K, as written (assumed: ASSUMED Hess's-law estimate (D-005): 3 BrO-(aq) -> BrO3-(aq) + 2 Br-(aq) with BrO3- -67.1 kJ/mol (NBS tables, Wagman et al. 1982, not re-read), BrO- -94.1 and Br- -121 kJ/mol as HYPO: -67.1 + 2 x (-121) - 3 x (-94.1) = -26.8 kJ per mol of bromate)

  Rate law

  basis: volume; driving: concentration; form: power_law; k: {"A":"2.111e8","Ea":80000}; orders: {"NAOBR":2}; temperature range: 273.15 – 313.15 (assumed: ASSUMED slow loss (D-005): hypobromite is kept cold because it disproportionates to bromate on standing; no open rate constant in strong caustic found (2026-11-05))

Sources

What the processes cite for this reaction, each source once: for the reaction itself, its conversion, its heat of reaction or its catalyst. As the processes write them; DOIs, US patent numbers and web addresses are linked.

1. ASSUMED (D-005): the yield loss of a cold hypobromite; not from the patent, which gives no yield

   For the reaction · cited by Carbon tetrabromide by semi-batch haloform bromination of acetone in aqueous hypobromite (314 t/a)

2. ASSUMED Hess's-law estimate (D-005): 3 BrO-(aq) -> BrO3-(aq) + 2 Br-(aq) with BrO3- -67.1 kJ/mol (NBS tables, Wagman et al. 1982, not re-read), BrO- -94.1 and Br- -121 kJ/mol as HYPO: -67.1 + 2 x (-121) - 3 x (-94.1) = -26.8 kJ per mol of bromate

   For the heat of reaction · cited by Carbon tetrabromide by semi-batch haloform bromination of acetone in aqueous hypobromite (314 t/a)