Process for the extractive oxidation of contaminants from raw hydrocarbon streams
First Claim
1. A process for the extractive oxidation of contaminants from raw hydrocarbon streams by oxidation and/or inertization of sulfur and nitrogen compounds from raw hydrocarbon streams rich in heteroatomic polar compounds in the presence of a peroxide solution/organic acid at atmospheric or higher pressure, under equal or higher than ambient temperature, wherein said process comprises the following steps:
- a) Oxidizing sulfur and nitrogen compounds present in said raw hydrocarbon streams by admixing, under agitation, said organic acid and said peroxide solution, the weight percent of the peroxide solution and organic acid based on raw hydrocarbon being at least 3 for both the peroxide solution and the organic acid, then adding to said oxidant solution said raw hydrocarbon stream containing sulfur and nitrogen compounds, at a pH between 1.0 and 6.0, the reaction being carried out under reflux of vaporized hydrocarbon obtained by external heating, for the period of time required to effect the extractive oxidation and obtaining a hydrocarbon stream wherefrom the sulfur and nitrogen compounds have been partially oxidized and simultaneously extracted by the aqueous oxidant, yielding a lower aqueous phase and an upper oxidized hydrocarbon phase;
b) After the end of said extractive oxidation, separating the upper oxidized hydrocarbon phase, neutralizing and water washing same, filtering and drying;
c) Recovering said treated, odorless, clear yellowish and stable hydrocarbon phase wherefrom the total nitrogen compounds have been removed up to 88.1% by weight, basic nitrogen compounds have been removed up to 99.1% by weight, and sulfur compounds have been removed up to 23% by weight, followed by olefin removal limited to 6.5 weight %, all percentages being based on the original feedstock content.
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Abstract
A process for the extractive oxidation of contaminants from raw hydrocarbon streams rich in heteroatomic polar compounds is described, the said process involving the extractive oxidation of sulfur and nitrogen compounds from said streams, the said process comprising treating said streams with a peroxide solution/organic acid couple, the weight percent of the peroxide solution and organic acid based on raw hydrocarbon being at least 3 for both the peroxide and organic acid solution, under an acidic pH, atmospheric or higher pressure and ambient or higher temperature. As a result of the reaction, the oxidized heteroatomic compounds, having strong affinity for the aqueous phase, are extracted into said aqueous phase, while the oxidized hydrocarbon is neutralized, water washed and dried, the resulting end product being a hydrocarbon stream from which have been removed 88.1 wt % or more of total nitrogen compounds and basic nitrogen up to 99.1 wt %, both calculated as mass contents, total Sulfur 23.3% removal, and removal of total olefins is limited to 6.5 weight %. The treated product is further directed to any refining process.
48 Citations
25 Claims
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1. A process for the extractive oxidation of contaminants from raw hydrocarbon streams by oxidation and/or inertization of sulfur and nitrogen compounds from raw hydrocarbon streams rich in heteroatomic polar compounds in the presence of a peroxide solution/organic acid at atmospheric or higher pressure, under equal or higher than ambient temperature, wherein said process comprises the following steps:
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a) Oxidizing sulfur and nitrogen compounds present in said raw hydrocarbon streams by admixing, under agitation, said organic acid and said peroxide solution, the weight percent of the peroxide solution and organic acid based on raw hydrocarbon being at least 3 for both the peroxide solution and the organic acid, then adding to said oxidant solution said raw hydrocarbon stream containing sulfur and nitrogen compounds, at a pH between 1.0 and 6.0, the reaction being carried out under reflux of vaporized hydrocarbon obtained by external heating, for the period of time required to effect the extractive oxidation and obtaining a hydrocarbon stream wherefrom the sulfur and nitrogen compounds have been partially oxidized and simultaneously extracted by the aqueous oxidant, yielding a lower aqueous phase and an upper oxidized hydrocarbon phase;
b) After the end of said extractive oxidation, separating the upper oxidized hydrocarbon phase, neutralizing and water washing same, filtering and drying;
c) Recovering said treated, odorless, clear yellowish and stable hydrocarbon phase wherefrom the total nitrogen compounds have been removed up to 88.1% by weight, basic nitrogen compounds have been removed up to 99.1% by weight, and sulfur compounds have been removed up to 23% by weight, followed by olefin removal limited to 6.5 weight %, all percentages being based on the original feedstock content. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification