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The difference between gutter oil and mineral oil with caustic soda added

The differences between gutter oil and mineral oil with caustic soda added are as follows:

1. Different ingredients: The main component of gutter oil is animal and vegetable oils, while the main component of mineral oil is alkanes.

2. The reactions to alkali are different: the fatty acids in gutter oil react with caustic soda to form fatty acid salts, and when heated in a sufficient amount of caustic soda solution, they can produce sodium and glycerol, higher fatty acids, which can be dissolved. In water, gutter oil will not separate in caustic soda solution. Mineral oils (such as gasoline, kerosene, diesel, etc.) are hydrocarbons and are insoluble in water. They will stratify after adding caustic soda solution.

3. Different densities: The density of gutter oil is smaller than that of water, while the density of mineral oil is larger than that of water.

4. Boiling points and ignition points are different: gutter oil has a lower boiling point and ignition point, while mineral oil has a higher boiling point and ignition point.

To sum up, the difference between gutter oil and mineral oil after adding caustic soda is mainly reflected in the composition, reaction to alkali, density, boiling point and ignition point.