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Process for the distillation of decanted oils for the production of petroleum pitches

a technology of distillation process and petroleum pitch, which is applied in the direction of tar working up, hydrocarbon distillation control/regulation, working up pitch/asphalt/bitumen, etc., can solve the problems of not being able to achieve the efficiency of the process, and achieve excellent physical and chemical qualities, increase the yield of production

Inactive Publication Date: 2010-04-01
PETROLEO BRASILEIRO SA (PETROBRAS)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]This invention relates to a process for the distillation of decanted oil in order to increase the yield of the production of pitch binders with excellent physical and chemical qualities which makes them suitable for use in various industrial applications.

Problems solved by technology

Finally it will be seen that concern lies with the physical and chemical qualities of the pitch for the production of carbon fibres, but not with the efficiency of the process as such.

Method used

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  • Process for the distillation of decanted oils for the production of petroleum pitches
  • Process for the distillation of decanted oils for the production of petroleum pitches
  • Process for the distillation of decanted oils for the production of petroleum pitches

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Embodiment Construction

[0019]This invention relates to a process for the distillation of decanted oil with a view to increasing the production yield of pitches having excellent physical and chemical properties.

[0020]As already mentioned previously, pitches can be produced using coal tar and heavy oil residues. Heavy oil residues or residues from its processing have been widely used as a primary material for obtaining pitches. However, the majority of the technical work which uses petroleum pitch in its experiments mentions the use of commercial pitches as a raw material. The production of pitches from decanted oil as raw material involves a distillation which removes lighter compounds and makes it possible to form a heavy material, a pitch which is in the solid state at ambient temperature. The yield of pitch obtained from conventional distillation is of the order of 20%. A vacuum which although accelerating the distillation process also results in even lower yields than in the conventional process may be...

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Abstract

This invention describes a process for the distillation of decanted oil to improve the efficiency of the production of pitches having excellent physical and chemical properties through the development of a distillation process which basically comprises the introduction of a stage of condensation of light volatile compounds derived from distillation of the decanted oil, causing these light compounds to be recycled to the hot zone of the still and react with the raw material acting as a solvent phase which has a lower viscosity than the reaction system, within a particular temperature range and for a particular time.

Description

FIELD OF THE INVENTION[0001]This invention has scope for application in the processes for the distillation of decanted oil with the aim of increasing the production yield and quality of the pitches obtained.BACKGROUND TO THE INVENTION[0002]Pitches are used for the production of carbon artefacts, especially for the production of carbon fibres having excellent mechanical properties. They also have application as binders in the industries for the production of anodes, aluminium and graphite electrodes for the steel industry.[0003]The manufacture of pitches conventionally uses coal tar as a raw material.[0004]However, environmental problems deriving from the use of coal tar, the instability in the supply of this raw material and the great variations in the price of this item has awoken industry's interest in alternative sources of raw material originating in the heavy residues of oil processing.[0005]Conventionally the production of pitches from decanted oil involves a processing stage ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10C3/06
CPCC10G7/12C10C3/06
Inventor DE CASTRO, LUIZ DEPINEDUTRA, CARLOS HENRIQUE MONTEIRO DE CASTRODE FREITAS, LUIZ CLOVIS
Owner PETROLEO BRASILEIRO SA (PETROBRAS)
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