6results about "Refining with solid alkaline material" patented technology

Systems and methods are presented for performing a hydrolytic dechlorination of pyrolysis oil using a basic adsorbent to produce an upgraded pyrolysis oil having at least a lower organic chloride content. An example method includes the steps of performing a hydrolytic dechlorination of pyrolysis oil containing one or more organic chloride species by: introducing the pyrolysis oil into a reactor, the pyrolysis oil having a temperature ranging from about 100 °C to about 300 °C; and contacting the pyrolysis oil with a basic adsorbent within the reactor under autogenic pressure and in the absence of hydrogen to hydrolyze the one or more organic chloride species of the pyrolysis oil and yield an upgraded pyrolysis oil having a lower organic chloride content.

The technology provides a method comprising the steps of: contacting a hydrocarbon feedstock with an effective amount of metallic sodium and an effective amount of an exogenous capping agent at a temperature of 250-500°C to produce a mixture of sodium salts and a converted feedstock, wherein the hydrocarbon feedstock comprises hydrocarbons having a sulfur content of at least 0.5 wt% and an asphaltene content of at least 1 wt%, the sulfur content comprising asphaltene sulfur and non-asphaltene sulfur, the converted feedstock comprises a hydrocarbon oil having a sulfur content lower than that in the hydrocarbon feedstock and a lesser asphaltene content than that in the hydrocarbon feedstock, and the ratio of asphaltene sulfur to non-asphaltene sulfur in the converted feedstock is lower than in the hydrocarbon feedstock.

This invention relates to a method for purifying crude pyrolysis products, the method comprising the following steps: A1) providing crude pyrolysis products containing hydrocarbons and impurities, the crude pyrolysis products being obtained at least partially through the pyrolysis of plastic waste; A2) contacting the crude pyrolysis products with an alkali metal hydroxide in a continuous mode at a temperature of 330°C to 400°C, preferably 340°C to 360°C, for a residence time of less than 10 min, to obtain a treated pyrolysis product and a residue containing reaction impurities; A3) washing the treated pyrolysis products with a polar washing solvent to obtain a purified pyrolysis product and a polar washing solvent phase; A4) separating the polar washing solvent phase and the purified pyrolysis product.

A method for purifying a composition having a plastic liquefaction oil, wherein (a) a composition of a plastic liquefaction oil is provided, then (b) washed with a first aqueous solution to obtain an organic phase containing the washed composition and a first aqueous effluent, then (c) the organic phase of step (b) is treated in the presence of a basic compound at a temperature of at most 450° C. to obtain an organic effluent comprising a treated composition, and (d) the organic effluent of step (c) is washed with a second aqueous solution to obtain a purified composition having a reduced heteroatom content, and a second aqueous effluent. Furthermore, in step (b), the first aqueous effluent is returned in whole or in part to step (d), and / or in step (d), the second aqueous effluent is returned in whole or in part to step (b).

A method, process, and system are disclosed for removing silicon-containing compounds from refinery hydrocarbon streams using alkaline treatment. The refinery stream, which may originate from units such as a crude stream, delayed coker, or other process unit, is contacted with an alkaline agent, such as a solid or an aqueous solution of sodium hydroxide, potassium hydroxide, or an amine. This treatment extracts at least a portion of the silicon-containing compounds, including organic silicon species, from the hydrocarbon stream. The process may be applied to whole streams or specific fractions such as LPG, naphtha, kerosene, diesel, or coker gas oil. Following alkaline treatment, the hydrocarbon stream may be directed to a hydrotreating unit, where reduced silicon content reduces catalyst poisoning.

The invention relates to a method for purifying a composition comprising a plastic liquefaction oil, wherein: (a) a plastic liquefaction oil composition is supplied, then (b) washed with a first aqueous solution to obtain an organic phase containing the washed composition and a first aqueous effluent, then (c) the organic phase from step (b) is treated in the presence of a basic compound at a temperature of not more than 450°C to obtain an organic effluent comprising a treated composition, and (d) the organic effluent from step (c) is washed with a second aqueous solution to obtain a purified composition having a reduced heteroatom content, and a second aqueous effluent. Furthermore, in step (b), the first aqueous effluent is returned in whole or in part to step (d), and / or in step (d), the second aqueous effluent is returned in whole or in part to step (b). Abstract figure: Fig. 1