Irreversible reaction

Benzyl bromide to benzal bromide (series bromination)

C7H7Br+Br2C7H6Br2+HBr

Direction
Irreversible
Processes
1
Stated as
Rate law
Heat of reaction
ΔH = -32,300 kJ/kmol (one process)
Element balance
Checked: balances
As the processes state itStoichiometry, conversions, heats of reaction and catalyst windows are taken from each process's files with their provenance. The build checks only that each process's equation balances in every element, from the process's own component formulas; it does not check the numbers. A process's design maturity applies to them.

Species

SpeciesNameCASRoleCoefficient
C7H7BrBenzyl bromide100-39-0reactant-1
Br2Bromine7726-95-6reactant-1
C7H6Br2Benzal bromide ((dibromomethyl)benzene)618-31-5product1
HBrHydrogen bromide10035-10-6product1

In the processes

  • Benzyl bromide by light-driven semi-batch bromination of toluene, HBr absorption and batch distillation (1000 t/a)Concept · not reviewed

    BALBR · Benzyl bromide to benzal bromide (series bromination)C7H7Br + Br2 → C7H6Br2 + HBr

    Stated as
    Rate law
    Phase
    liquid
    Element balance
    Balances in every element
    Heat of reaction
    ΔH = -32,300 kJ/kmol at 298.15 K, as written (assumed: ASSUMED equal to BNBR's (D-005): no open formation enthalpy of benzal bromide)
    Rate law
    basis: volume; driving: concentration; form: power_law; k: {"A":2.066,"Ea":30000}; orders: {"BNBR":1,"BR2":1}; temperature range: 343.15 – 383.15 (assumed: ASSUMED k2/k1 = 0.2 (D-005): the series bromination is slower per molecule; no open relative rate at these conditions found (2026-11-06))

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. US 3 528 899 A (1970): the light-driven side-chain bromination is a series of successive reactions, the degree of side-chain bromination set by the moles of bromine introduced (Example II, xylene: 41 % mono- and 46 % dibromoxylene); no rate for toluene, so k2 stays ASSUMED (SRC-1, D-005)

    For the reaction · cited by Benzyl bromide by light-driven semi-batch bromination of toluene, HBr absorption and batch distillation (1000 t/a)

  2. ASSUMED equal to BNBR's (D-005): no open formation enthalpy of benzal bromide

    For the heat of reaction · cited by Benzyl bromide by light-driven semi-batch bromination of toluene, HBr absorption and batch distillation (1000 t/a)