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Method of processing oil refining waste

a technology of oil refining waste and oil refining oil, which is applied in the field of processing oil refining waste, can solve the problems of inability to refining, inability to meet the requirements of oil refining, so as to reduce the amount of waste, and reduce the effect of radiant heat loss

Inactive Publication Date: 2011-08-25
P FUEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]The method of the invention can advantageously be conducted in an effective and efficient manner. This is believed to be at least in part due to using FIR to heat the waste. In particular, it has been found that the waste can be heated significantly faster and the temperature of the waste controlled more readily by using FIR compared with using conventional heating means. The waste can also be heated in uniform manner, thereby minimising if not avoiding altogether the formation of hotspots. Furthermore, FIR heating has been found to not only minimise radiant heat loss during processing but also reduce the amount of coke deposition within the vessel. These processing advantages collectively enhance the efficiency of being able to recover value added products from the waste.

Problems solved by technology

The refining of crude oil and petroleum inherently generates a significant amount of oil refining waste.
Typical tank bottom sludge can contain as much as 30-45% by weight water and 5-20% non-refinable solids and is not considered suitable for refining.
Similarly, when oil feed stocks are refined using conventional cracking and fractionating equipment, high molecular weight organic compounds and various non-volatile / crackable components are condensed or trapped in the cracker or still bottoms.
As with the sludges, the bottoms are not considered suitable for further refining and need to be disposed of in an appropriate manner.
However, disposal regulations have become more stringent and the cost of processing oil refining waste to render it safe for disposal has escalated.
However, conventional pyrolysis techniques for processing oil refining waste are renowned for being energy inefficient.
In particular, the heated vessels are prone to significant radiant heat losses, and a thick insulating layer of carbonaceous char or pyrolytic residue typically builds up on the inner heat exchanging surfaces of the pyrolysis vessel (a problem commonly referred to as “coking”).
Conventional techniques also generally lack the ability for precise and uniform heating of the waste, which can adversely impact on the conversion efficiency of waste into useful volatile hydrocarbon products.
Such process limitations adversely impact on the commercial viability of the technology.

Method used

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  • Method of processing oil refining waste

Examples

Experimental program
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Effect test

example 1

[0053]A thick hydrocarbon oil sludge collected from tank bottoms was fed into the pyrolysis process via a monopump. The oil sludge was highly viscous. The oil sludge contained about 45-55 wt % oil, 25 wt % inert solids and 20-25 wt % water. The tank bottoms were pyrolyzed in a stainless steel (SS316) pyrolysis vessel heated internally via 43 far infra-red heating rods (‘inner heating’). After 48 hrs only a 2 mm layer of carbonization had deposited on the heating rods and no coking had occurred on the inside of the pyrolysis chamber. There was no measurable reduction in the efficiency of heating.

example 2

[0054]A thick hydrocarbon oil sludge collected from tank bottoms was fed into the pyrolysis process via a monopump. The oil sludge comprised of 45-55 wt % oil, 25 wt % inert solids and 20-25 wt % water. FIR pyrolysis of the 100% tanks bottoms gave 35% mixed oil, 15% non-condensable gas (mainly alkanes less than C7) and 50% solid carbonaceous residue. The mixed oil was further fractionated into approximately 60% wt. diesel fuel and 40% gasoline.

[0055]Example 3

[0056]It was found that FIR pyrolysis of 50% tanks bottoms and 50% waste plastics (polyolefins) conducted in a similar manner to Example 1 gave 65% mixed oil, 20% non-condensable gas (mainly alkanes less than C7) and 15% solid carbonaceous residue.

[0057]Co-processing of tank bottoms with waste plastics was found to give yields of mixed oil (diesel and gasoline) and lower yields of residual carbonaceous residues.

[0058]Properties of diesel produced according to Example 2 is shown in Table 1 below.

TABLE 1PropertyDiesel Test Results...

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Abstract

The present invention relates to a method of processing oil refining waste, the method comprising feeding the waste into a vessel and heating the waste such that it liberates volatile hydrocarbons, wherein the waste is heated using far infrared radiation, and wherein the liberated volatile hydrocarbons are collected for subsequent use.

Description

FIELD OF THE INVENTION [0001]The present invention relates to a method of processing oil refining waste, and in particular to a method of processing such waste so as to recover usable hydrocarbon products therefrom. The invention also relates to hydrocarbon products produced in accordance with the method.BACKGROUND OF THE INVENTION[0002]The refining of crude oil and petroleum inherently generates a significant amount of oil refining waste. As used herein, the expression “oil refining waste” is intended to mean collectively the residuals of any crude oil and petroleum acquisition, transporting, storing, and refining operation, and includes, but is not limited to sludges, bottoms, waxes, oils, greases, media contaminated with such waste such as contaminated filter media and soils, and any combination thereof.[0003]Depending upon the source of crude oil, feed stock delivered to a given refinery may contain various non-refinable components such as high molecular weight organic compounds...

Claims

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Application Information

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IPC IPC(8): C10L1/04C10G31/06
CPCB09B3/00B09B3/0083C10G1/00C10G1/10C10G32/02C10G2400/02C10G2400/04C10G2400/28C10G31/06C10G2300/1003B09B3/40C10G9/24C10G32/00C10G15/08
Inventor SCHEIRS, JOHN
Owner P FUEL