The catalysis increases the water vapor content and reduces the oil and gas partial pressures, but the total pressure in the distillation tower remains unchanged
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The catalysis increases water vapor, reducing the partial pressure of hydrocarbons; yet the total pressure in the distillation tower remains unchanged. Why then does the dry point of gasoline increase?
Put simply, when the vapor pressure of oil and gas decreases, the volatile light components evaporate, leaving the remaining components to become heavier.
The basic principle of stripping is to increase the partial pressure of water vapor while keeping the temperature and total pressure constant, thereby reducing the partial pressure of oil and gas. This increases the vaporization rate of the oil, allowing for a reduction in the content of light components. An increase in water vapor is equivalent to an increase in the amount of stripping steam, which carries the light components in the middle of the tower (together with some of the heavier components) to the top of the tower.