Irreversible reaction

Chemical dechlorination with sulfite in alkaline brine

Direction: Irreversible
Processes: 2
Stated as: Fixed conversion, Stoichiometry only
Element balance: Checked: balances in all 2 processes

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

Species	Name	CAS	Role	Coefficient
Na₂SO₃	Sodium sulfite	7757-83-7	reactant	-1
Cl₂	Chlorine	7782-50-5	reactant	-1
NaOH	Sodium hydroxide	1310-73-2	reactant	-2
Na₂SO₄	Sodium sulfate	7757-82-6	product	1
NaCl	Sodium chloride	7647-14-5	product	2
H₂O	Water	7732-18-5	product	1

In the processes

Chlor-alkali by membrane-cell electrolysis (100 kt/a Cl2, 50 wt-% caustic soda, hydrogen)Concept · not reviewed
SULFITE_DECHLOR · Chemical dechlorination with sulfite in alkaline brineNa2SO3 + Cl2 + 2 NaOH → Na2SO4 + 2 NaCl + H2O
Element balance
Balances in every element
Thionyl chloride from sulfur, chlorine and SO2 over activated carbon (3.75 t/h)Concept · not reviewed
CL2_SULFITECl2 + Na2SO3 + 2 NaOH → Na2SO4 + 2 NaCl + H2O
Stated as
Fixed conversion
Element balance
Balances in every element
Conversion
99.9 % of CL2 (assumed: D-009: chlorine absorbed and reduced by the sulfite formed from the SO2 (sulfite in excess, so no hypochlorite remains), ASSUMED)

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.

D-009: chlorine absorbed and reduced by the sulfite formed from the SO2 (sulfite in excess, so no hypochlorite remains), ASSUMED
For the conversion · cited by Thionyl chloride from sulfur, chlorine and SO2 over activated carbon (3.75 t/h)