Mineral oils: processes and products – Refining – Sulfur removal
Patent
1987-11-30
1989-07-18
Caldarola, Glenn
Mineral oils: processes and products
Refining
Sulfur removal
208243, 208247, C10G 2904
Patent
active
048490946
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
1. Background of the Invention
The present invention relates to processes for desulphurization of heavy petroleum residues.
These heavy petroleum residues find an extensive use in industry. Such heavy resides can be exemplified, by residual asphalt, boiler fuel, petroleum oils widely used as fuels, lubricants, as well as bitumens. Bitumens are employed in road construction, hydraulic engineering as hydroinsulation, roofing and anticorrosion materials, as well as a binder in the manufacture of bitumen-containing and heat-insulation materials. Bitumens also comprise raw materials in the production of petroleum coke.
2. Description of the Related Art
This wide application of heavy petroleum residues is possible owing to a wide range of useful properties thereof: heat- and frost-resistance, plasticity, good adhesion-cohesion characteristics, resistance in aggressive media, high dielectric properties. However, at a long-time exposure to high temperatures (up to 150.degree. C.) a negative influence of sulphur compounds contained in petroleum residues starts to manifest itself. Sulphur compounds cause corrosion of steel structures. Electrical resistance of coatings, e.g. bitumen ones, gets substantially decreased upon exposure to a humid medium at an elevated temperature due to the presence of such compounds, i.e. sulphur compounds in heavy petroleum residues considerably lower their physico-mechanical characteristics. There are a number of processes aimed at reduction of the content of sulphur compounds (desulphurization of heavy petroleum residues by way of treatment thereof with various agents). Thus, known in the art is a process for desulphurization of petroleum oils (British Application No. 2,019,433; 1979). According to this process, petroleum oil is charged into a container and heated to a temperature of 120 to 350.degree. C., whereafter sulphohydrates or hydrates of alkali metal sulphides (cesium, rubidium, potassium, sodium or lithium) are added thereto.
The process of desulphurization is conducted in the atmosphere of hydrogen under a pressure of up to 400kg/cm.sup.2, the desulphurized product is separated from hydrates of an alkali metal hydroxide and from hydrates of an alkali metal sulphide or from a mixture of both. The recovery of contaminants from desulphurized petroleum oils is effected by passing steam therethrough.
This process makes it possible to obtain petroleum oils with a sufficiently low content of sulphur compounds; however, the process is rather complicated and expensive, since, it necessitates the use of hydrogen under a high pressure.
In another process heavy petroleum residues such as boiler fuel are continuously supplied into a reactor, wherein a stationary bed of a catalyst is provided. Simultaneously with the starting product hydrogen is supplied at a temperature within the range of from 315 to 455.degree. C. under a pressure of from 14 to 700 atm. A stationary bed of catalyst particles contains 10 to 20% by weight of molybdenum oxide and/or 1 to 8% by weight of cobalt oxide supported on an oxide carrier. The product with a reduced content of sulphur compounds is withdrawn from the reactor (USSR Pat. No. 638267, 1977).
This process makes it possible to lower the content of sulphur by 80-85%, but this process also features a complicated scheme, since it necessitates the use of hydrogen; furthermore, preparation of the employed catalyst is associated with substantial process difficulties.
DISCLOSURE OF THE INVENTION
The present invention is directed to the provision of such a process for desulphurization of heavy petroleum residues which would make it possible to considerably lower the content of sulphur compounds in the starting product following a simplified procedure.
This object is accomplished by that in the process for desulphurization of heavy petroleum residues comprising heating of heavy petroleum residues to a temperature of 190.degree.-200.degree. C., their treatment by metal oxides and hydroxides and separation of disulphrized residues accordi
REFERENCES:
patent: 3949914 (1976-03-01), Yoo et al.
patent: 4336130 (1982-06-01), Miller et al.
Alexandrovich Jury B.
Chebyshev Vladimir A.
Grokhotov Vyacheslav T.
Pecheny Boris G.
Sheludko Viktor V.
LandOfFree
Process for desulphurization of heavy petroleum residues using e does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for desulphurization of heavy petroleum residues using e, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for desulphurization of heavy petroleum residues using e will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-169704