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A method of treating oily solid particles

a technology of oily solid particles and oil, applied in solvent extraction, separation processes, dewatering/demulsification with chemical means, etc., to achieve the effect of enhancing the efficiency of the disclosed method, reducing the oil content, and reducing the pressur

Inactive Publication Date: 2016-11-03
BCI SABAH INT PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an effective method to treat oily solid particles by using a specially formulated emulsified composition. This composition can repel oil off the surface of the particles, and the particles can be easily reacted with the composition. The emulsified composition may further comprise a chelating agent to enhance the efficiency of the method.

Problems solved by technology

Treatment of oily waste material or oily solids derived majorly from oil drilling and refinery activities remain one of the biggest challenges in the oil and gas industry.
Presence of complex elements in the oily solids poses great hurdles towards the attempt to effectively separate the oil fragments from the solid phase and various approaches have been proposed along the years to tackle the problems.

Method used

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  • A method of treating oily solid particles

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034]The invented emulsified composition presented in following examples are water-in-oil nanoemulsion with oil-water interfacial tension lower than 0.01 mN / m (measured at 25° C. by KRUSS spinning drop tensiometer; model SITE100). The mean particle size of the nanoemulsion is smaller than 100 nm (measured at 25° C. by particle size analyzer; Malvern Zetasizer Nano ZS). The oily solid samples listed in TABLE 1 are the samples used in testing various embodiments of the present invention. The properties of each oily solid sample were determined by using the retort analysis. All samples are actual specimens from Oil & Gas industrial processes. Treatment on these oily solid samples aims to reduce the oil content in the disposed solid to <1 w / w %. The evaluation of the effectiveness of the invented emulsified composition, treatment process and other related cleaning chemicals are demonstrated in the next EXAMPLEs.

TABLE 1Composition of oily solid samples from retort analysis% Total% Wax (...

example 2

[0035]The efficiency of the invented oily solid treatment method and cleaning chemical composition was evaluated with different process steps and cleaning chemicals used. The efficiency of the process was referred to the total oil content in the solid after final treatment. Oil content was determined by the retort analysis and / or Soxhlet solvent extraction (if the oil content was expected to be <1 w / w %). The typical target of the oil content in the solid after treatment is <1 w / w %. Sample A, which is drill cuttings had been used for the experiment in this EXAMPLE. Sodium carbonate, sodium tripolyphosphate and potassium hydroxide had been used as the alkaline salt to adjust the pH of the cleaning solution to 8-12. The cleaning solution / sample ratio is 1 / 1 by weight. The washing solvent was water or water mixed with co-solvent (ethylene glycol, isopropanol, or butoxyethanol). Water was the solvent of cleaning solution for the first process step. The % concentration of cleaning solut...

example 3

[0048]The treatment of different kinds of oily solid samples was evaluated in this example. There are 4 kinds of samples shown in TABLE 1 which are drill cuttings (experiment A8), sand produced from oil production well (experiment B1), solid sediment from the used oil-based drilling fluid (experiment C1), and crude oil sludge solid sediment (experiment D1, D2 & 0.15 D3). The cleaning solution in the first process step contains 1 w / w % of the invented emulsified composition and 5 w / w % sodium carbonate in water. Water was used as the washing agent in the washing step. All experiments used drying process as the final treatment step. It was indicated that the oil could be efficiently removed from the solid for sample A, B and C (experiment A6, B1 and C1, respectively) effectively, reducing the oil content in the solid samples from 12-13 w / w % to <1 w / w %.

[0049]However, the same cleaning solution composition used to treat these 3 samples was not very effective for sample D (experiment D...

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Abstract

A method of cleaning oily solid particles entrapping heavy crude oil comprises the steps of creating electrostatic repulsion in between the surface of the oily solid particles and the entrapped heavy crude oil through negatively charging the surface of the oily solid particles with a basic solution; reacting the oily solid particles with an emulsified composition containing light hydrocarbon in the presence of the basic solution to displace the entrapped heavy crude oil from the surface of the oily solid particles using the light hydrocarbon; separating the reacted oily solid particles into a liquid phase and a solid phase; and removing residues of the emulsified composition from solid phase, wherein the emulsified composition comprises a surfactant in 2 to 40% by weight of total composition selected from alkyl polyglycosides, glyceryl-based surfactant, polyglyceryl-based surfactant, sucrose-based surfactant, sorbitol fatty acid esters, sulfofatty acid methyl esters, acylated aminoacids, acyl glutamates, acyl glycinates, acyl alaninates, lauroyl sarcosinate, nopol alkoxylates; a co-surfactant in 1 to 30% by weight of total composition selected from the group consisting of C3 to C18 alcohols, C3 to C18 alkyl lactates, lecithins, C3 to C18 fatty acids, diols, amino acids and any mixtures thereof; an oil phase in 15 to 90% by weight of total composition; and an aqueous phase in 0.5 to 20% by weight of total composition.

Description

FIELD OF INVENTION[0001]The present invention relates to a method of treating oily solid particles entrapping particularly heavy crude oil and the like. Specifically, the disclosed method conditions the oily solid particles to a preferred state and reacts the oily solid particles with a specially formulated emulsified composition to remove the entrapped crude oil from the surface of the solids.BACKGROUND OF THE INVENTION[0002]Treatment of oily waste material or oily solids derived majorly from oil drilling and refinery activities remain one of the biggest challenges in the oil and gas industry. These oily solid or oily waste materials can refer to oil sludge, drill cuttings, contaminated soils, contaminated sands / minerals and the like generated from various areas in the industry. It is a mixture majorly composed of sands, clay, minerals, and oil (crude oil or base oil from drilling fluid) presented in the mixture. It is crucial to at least remove or recover the crude oil from the so...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G1/00C10G1/04C10G33/00
CPCC10G1/00C10G2300/1033C10G1/045C10G33/00B01D11/0288C10G32/02C10G33/02C10G33/04C10G1/047
Inventor CHUN HWA, SEEYOONG SHANG, LOKEWASAN, SAPHANUCHARTYANG LOONG, CHONG
Owner BCI SABAH INT PETROLEUM
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