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Pretreatment liquid, application of pretreatment liquid, and treatment method of heavy oil sludge

A technology of pretreatment liquid and treatment method, which is applied in sludge treatment, chemical instruments and methods, and immiscible solvent sludge treatment, etc., can solve the problems that the cleaning effect needs to be improved, the energy consumption is large, and the oil content of the residue is high.

Inactive Publication Date: 2021-12-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two cleaning temperatures are both 80°C, which consumes a lot of energy, and the process is complicated, and the residue oil content is high, so the cleaning effect needs to be improved.

Method used

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  • Pretreatment liquid, application of pretreatment liquid, and treatment method of heavy oil sludge
  • Pretreatment liquid, application of pretreatment liquid, and treatment method of heavy oil sludge
  • Pretreatment liquid, application of pretreatment liquid, and treatment method of heavy oil sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Add the asphaltene dispersant DP (p-dodecylphenol) with a mass fraction of 5% into the non-polar solvent n-heptane, stir evenly to obtain a pretreatment liquid, and take No. 1-8 oil sludge (see Table 1 for oil sludge characteristics) 2g each, and then add 6g of pretreatment solution, stir at 600r / min at 25°C for 30min, let stand for 2min to separate layers, and perform solid-liquid separation to obtain a solid phase; sodium dodecylbenzenesulfonate and partial pentahydrate Mix sodium silicate at a mass ratio of 1:3, add water three times and stir evenly to obtain 10wt.% cleaning agent, stir the solid phase and 6g of cleaning agent at 700r / min for 30min at 60°C, and clean the oil-containing The sludge is centrifuged for 5 minutes in a centrifuge with a centrifugal speed of 5000r / min to achieve three-phase separation of oil, water and solid, and the treated thick oil sludge is obtained.

Embodiment 2

[0049] Add the asphaltene dispersant DBSA (p-dodecylbenzenesulfonic acid) with a mass fraction of 5% into the non-polar solvent n-dodecane, stir evenly to obtain a pretreatment liquid, and take No. 1 to No. 8 oil sludge (for oil sludge characteristics, see Table 1) each 2g, then add 6g of pretreatment solution respectively, after stirring at 600r / min at 25°C for 60min, let stand for 3min to separate layers, and carry out solid-liquid separation to obtain a solid phase; Mix sodium silicate at a mass ratio of 1:1, add water three times and stir evenly to obtain 5wt.% cleaning agent, stir the solid phase and 6g cleaning agent at 400r / min for 30min at 40°C, and clean the oil-containing The sludge is centrifuged in a centrifuge with a centrifugal speed of 6000r / min for 5 minutes to achieve three-phase separation of oil, water and solid, and the treated thick oil sludge is obtained.

Embodiment 3

[0051] Add the asphaltene dispersant CDEH (N,N-bis(hydroxyethyl)cocamide) with a mass fraction of 3% into the non-polar solvent kerosene, stir evenly to obtain the pretreatment liquid, take No. 1 and No. 4 oil sludge ( See Table 1 for sludge characteristics) each 2g, then add 2g of pretreatment solution respectively, stir at 500r / min for 30min at 25°C, let stand for 3min to separate layers, and perform solid-liquid separation to obtain a solid phase; sodium fatty alcohol ether carboxylate Mix with sodium carbonate at a mass ratio of 1:1, add water three times and stir evenly to obtain 5wt.% cleaning agent, stir the solid phase and 8g of cleaning agent at 500r / min for 60min at 50°C, and clean the oil-containing The sludge is centrifuged for 5 minutes in a centrifuge with a centrifugal speed of 5000r / min to achieve three-phase separation of oil, water and solid, and the treated thick oil sludge is obtained.

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Abstract

The invention belongs to the technical field of treatment of oil-containing sludge polluted by crude oil, and particularly relates to pretreatment liquid, application of the pretreatment liquid and a treatment method of heavy oil sludge. The pretreatment liquid containing the asphaltene dispersing agent and the non-polar solvent provided by the invention is used for pretreating the heavy oil sludge, asphaltene in the heavy oil sludge is a polar component, and the asphaltene dispersing agent has the effects of being combined with asphaltene and forming hydrogen bonds with heteroatoms such as S and N on the surface of asphaltene molecules, so that the self-aggregation of asphaltene in the heavy oil sludge can be prevented; the asphaltene and other substances can be easily stripped from the particle surface so as to disperse the asphaltene in the heavy oil sludge in the non-polar solvent for a long time, the severely cemented oil sludge is uniformly dispersed in the pretreatment liquid, most of the oil phase, especially the polar oil phase difficult to clean, is removed in the pretreatment stage, and the pretreated heavy oil sludge still has more residual oil; and further, residual oil on the surface of the solid is cleaned off by adopting thermochemical cleaning, so that the emission standard is reached.

Description

technical field [0001] The invention belongs to the technical field of treatment of oily sludge polluted by crude oil, and in particular relates to a pretreatment liquid and its application, and a treatment method for heavy oil sludge. Background technique [0002] Oily sludge is one of the main pollutants in current petroleum and petrochemical production operations. The country's demand for crude oil continues to increase, and the amount of oily sludge produced every year also increases with the increase in crude oil exploitation. The accumulation of oily sludge not only takes up a lot of space, wastes resources and increases the content of hydrocarbons in the air, but also pollutes soil and water bodies. The "National Hazardous Waste List" has listed oily sludge as a harmful substance (HW08). [0003] When crude oil extraction reaches the middle and late stages, the proportion of heavy oil sludge continues to increase. This type of sludge has high asphaltene content, seri...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/127
CPCC02F11/002C02F11/127
Inventor 孙德军许昊苒姜凯李崎满晏全徐政和
Owner SHANDONG UNIV
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