Process for converting acid sludge to intermediate sludge
OwnerBenjamin S. Santosinventor
Life of this patent
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Abstract
A process for converting the acid sludge produced by waste oil refineries into an acid sludge intermediary which can be used in the production of asphaltic mixtures. The process includes contacting the entire surface area of acid sludge with a pH altering agent such as an aqueous inorganic liquid, and separating the liquid layer from the sludge layer, thereby producing an intermediate sludge having properties which make it suitable for use in asphalt production.
Claims13
A process for converting acid sludge to intermediate sludge and for forming blown asphalt from said intermediate sludge, comprising:
- altering the pH of the acid sludge by adding a sufficient volume of liquid pH elevating agent relative to a volume of said acid sludge being treated, said pH elevating agent having a pH ranging form 3 up to 14, said volume and pH of said pH elevating agent being sufficient as to raise the pH of said acid sludge to from approximately 3 to approximately 7 such that said acid sludge does not become sandy and unmeltable at temperatures from room temperature up to approximately 275 degrees centigrade, thereby creating an intermediate mixture comprising a liquid layer and a layer of intermediate sludge having a pH in the range from approximately 3 to approximately 7, and;
- separating said liquid layer from said layer of intermediate sludge, and further heating and oxidizing said intermediate sludge to form blown asphalt.
A process for converting said sludge to intermediate sludge and for forming blown asphalt from said intermediate sludge, comprising;
- altering the pH of the acid sludge by adding a sufficient volume of solid pH elevating agent selected from the group consisting of lime, caustic soda, and soda ash, the volume of said solid pH elevating agent relative to the volume of said acid sludge being treated being sufficient as to raise the pH of said acid sludge to between approximately 3 and approximately 7 such that said acid sludge does not become sandy and unmeltable at temperatures from room temperature up to approximately 275 degrees centigrade, thereby creating an intermediate sludge having a pH in the range from approximately 3 to approximately 7, and further heating and oxidizing said intermediate sludge to form blown asphalt.
Dependencies are inferred from the claim text.