Lignin based colloidal compositions
AssigneePolyphalt L.L.C.
InventorZhi-Zhong Liang
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Abstract
Methods for making the stable dispersion of lignin components of black liquor in bitumen. Representative methods comprising converting an aqueous colloidal dispersion of lignin in spent pulping liquor to an anhydrous colloidal dispersion of lignin in a lubricating oil by mixing a lubricating oil with the spent pulping liquor, and dewatering the mixture so formed at an elevated temperature to form a cream-like paste compatible with bitumen, and mixing said anhydrous colloidal dispersion of lignin with bitumen.
Claims24
A method of producing a bituminous composition, which comprises:
- converting an aqueous colloidal dispersion of lignin in spent pulping liquor to an anhydrous colloidal dispersion of lignin in a lubricating oil by mixing a lubricating oil with the spent pulping liquor, and
- dewatering the mixture so formed at an elevated temperature to form a cream-like paste compatible with bitumen, and
- mixing said anhydrous colloidal dispersion of lignin with bitumen.
A method of producing a composition, which comprises:
- converting an aqueous colloidal dispersion of lignin in spent pulping liquor to an anhydrous colloidal dispersion of lignin in a lubricating oil, and
- blending the anhydrous colloidal dispersion of lignin in a lubricating oil with bitumen.
A method of producing a bituminous composition, which comprises:
- converting an aqueous colloidal dispersion of lignin in spent alkaline pulping liquor to an anhydrous colloidal dispersion of lignin in a lubricating oil, and
- mixing said anhydrous colloidal dispersion of lignin with bitumen.
A method of producing a bituminous composition which comprises:
- treating bitumen with an inorganic acid at an elevated temperature to provide acid-treated bitumen,
- slowly adding to the acid-treated bitumen a lignin-containing spent alkaline pulping liquor, while agitating the bitumen to effect controlled dewatering of the spent pulping liquor to form a stable, substantially anhydrous colloidal dispersion of lignin in the bitumen.
Dependencies are inferred from the claim text.