Process of Modification of a Feedstock in a Delayed Coking Unit

Inactive Publication Date: 2009-06-04
PETROLEO BRASILEIRO SA (PETROBRAS)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]The process of modification of a feedstock in a Delayed Coking Unit, subject of the present invention, considers a solution maximising the yield of diesel oil from coke and minimising the yield of heavy gas oil from coke by means of modifications to the feedstock of a Delayed Coking Unit.

Problems solved by technology

As may be observed there is a tendency to develop delayed coking processes with the objective of maximising the yield of liquid products, principally petrol, and reducing the yield of coke and gas.
This leads to the generation of increasingly heavy vacuum residuums at the bottom of the vacuum distillation tower.

Method used

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  • Process of Modification of a Feedstock in a Delayed Coking Unit

Examples

Experimental program
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Effect test

example 1

[0043]A vacuum residuum was processed in a pilot delayed coking unit without heavy gas oil from coke recycle. The temperature of the furnace was 0.500° C. and the pressure at the top of the coke drum was 2 kgf / cm2g. Volume yields of 51.3% for diesel oil from coke and of 20.2% for heavy gas oil from coke were obtained. The mass yield of coke was 24.5%.

example 2

[0044]A vacuum residuum was processed in an industrial delayed coking unit having a furnace temperature of 500° C. and pressure at the top of the coke drum of 2 kgf / cm2g and a heavy gas oil from coke recycle rate of 8%. Volume yields of 54.9% for diesel oil from coke and of 14.6% for heavy gas oil from coke were obtained. The mass yield of coke was 25%.

example 3

[0045]A vacuum residuum was processed in a pilot delayed coking unit having a furnace temperature of 500° C., pressure at the top of the coke drum of 2 kgf / cm2g and total recycle of heavy gas oil from coke. The volume yield was 68.2% for diesel oil from coke. The mass yield of coke was 26%.

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Abstract

A process is described of delayed coking optimized for greater yield of diesel oil from coke by means of modifications to the feedstock in a Delayed Coking Unit. According to the present invention in a first embodiment of the invention the feedstock includes the bottom product of the vacuum distillation tower, known in the prior art as vacuum residuum and the heavy gas oil from coke obtained in the fractionation tower and recycled to comprise the aforesaid combined feedstock. In a second embodiment of the present invention the feedstock consists of: the bottom residuum proceeding from the atmospheric distillation tower, known in the prior art as atmospheric residuum, and heavy gas oil from coke obtained in the fractionation tower and recycled to comprise the aforesaid feedstock of the unit.

Description

BACKGROUND OF THE INVENTION[0001]The field of application of the present invention is delayed coking processes. Particularly in delayed coking processes wherein the yield of diesel oil is maximised whereas the yield of heavy gas oil from coke is minimised through modifications to the feedstock of a Delayed Coking Unit.DESCRIPTION OF PRIOR ART[0002]The process of delayed coking of residual petroleum fractions has been employed in the petroleum refining industry for some time. This process permits conversion of heavy petroleum fractions into lighter products having greater value added such as, for example, liquefied petroleum gas (LPG), naphtha, gas oils and coke.[0003]In a conventional delayed coking process the new feedstock, generally a vacuum residuum, is fed to the bottom region of the fractionation tower wherein incorporation of the natural recycle occurs forming the combined feedstock of the Unit. Normally the natural recycle is employed to adjust the quality of heavy gas oil f...

Claims

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Application Information

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IPC IPC(8): C10G9/00
CPCC10B55/00C10G9/005C10B57/045
Inventor SOARES, GLORIA MARIA GOMESGONCALVES, NATALIE JORGENADOLNI, ALINE VOIGTDA COSTA BARROS, FRANCISCO CARLOSDE LUCENA, SERGIO CUNHADA COSTA, SERGIO NUNES
Owner PETROLEO BRASILEIRO SA (PETROBRAS)
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