In this communication, we report dissociation pressures for sulfur dioxide clathrate hydrates in the temperature range of (279.9 to 285.2) K and for dathrate hydrates of methyl mercaptan in the temperature range of (283.4 to 285.0) K. The experimental data were measured using an isochoric pressure-search method. It is shown that the dissociation pressure of sulfur dioxide dathrate hydrates is higher than the dissociation pressure of methyl mercaptan clathrate hydrates in the temperature ranges studied in our work.