Which of the following equations is not involved in the Solvay process of manufacturing sodium bicarbonate.

• A

  ${\mathrm{CaCO}}_3\stackrel{}{\stackrel{\mathrm{heat}}{\to }\mathrm{CaO}+{\mathrm{CO}}_2}$

• B

  $\mathrm{NaCl}+{\mathrm{NH}}_3+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2\to {\mathrm{NH}}_4\mathrm{Cl}+{\mathrm{NaHCO}}_3$

• C

  $\mathrm{Ca}{\left(OH\right)}_2+2{\mathrm{NH}}_4\mathrm{Cl}\to 2N{H}_3+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CaCl}}_2$

• D

  ${\mathrm{Na}}_2{\mathrm{CO}}_3+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}\underset{\mathrm{Heat}}{\to }2{\mathrm{NaHCO}}_3$