Degreasing method of super heavy oil wastewater

A technology for super-heavy oil and waste water, which is applied in separation methods, grease/oily substance/floating matter removal devices, liquid separation, etc. simple effect

Active Publication Date: 2013-04-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The existing multi-stage loop reactor used in the air flotation test of oily wastewater has the following defects: the oil and water are separated by bubbling, and the foam contains a certain amount of water, so that about 10% of

Method used

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  • Degreasing method of super heavy oil wastewater
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  • Degreasing method of super heavy oil wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Adopt continuous operation mode, demulsification-circulation air flotation-oil scraping to separate heavy emulsified oil in wastewater.

[0036] The wastewater is super-heavy oil processing wastewater from an oil refinery, with a total COD of 42,000 mg / L, of which emulsified oil and other colloidal suspended solids account for 40,000 mg / L of COD, and the average diameter of emulsion droplets is 2.5 μm. The diameter ratio of the bubble section and the foam section of the circular foam separation tower is 1:1.4, and the height ratio is 1:0.8; the diameter ratio of the foam section overflow tank weir to the bubble section is 1:1, and the overflow tank weir and the foam section The height ratio is 0.3:1. The guide cylinder is a secondary guide cylinder; the center of the bottom of the reactor is equipped with a special micropore (average pore diameter of 3 μm) columnar gas distributor (diameter 20mm, height 60mm), and the liquid capacity is 42L. The demulsifier is polyethe...

Embodiment 2

[0038] Batch operation mode, demulsification-circulation air flotation-oil scraping is adopted to separate heavy emulsified oil in wastewater.

[0039] Waste water and device are with embodiment 1. The demulsifier is aliphatic amine PAE 1912, the dosage is 6.0g, and it is prepared into an aqueous solution with a concentration of 60g / L, which is added to the bubbling section at a flow rate of 10mL / h; the superficial gas velocity is 1.1cm / s, and the oil scraper It is a belt-type oil scraper, the ratio of the bandwidth to the diameter of the bubble section of the circulating foam separation tower is 0.7:1, and it starts once every ten minutes; the separation time is 1.5h. The COD of the effluent is 1400mg / L, and the removal rate of emulsified oil reaches 97%. Wastewater yield was 98%.

Embodiment 3

[0041] This example shows the removal effect of emulsified oil under the condition of different demulsifiers and their dosage, and adopts batch operation.

[0042] Waste water, device, demulsifier and its consumption and feeding method, oil scraper, and residence time are all the same as in Example 1. The superficial gas velocity is 1.1cm / s, and the separation time is 2h. The demulsifier adopts five schemes. Plan A: polyether demulsifier DL32, formulated as an aqueous solution with a content of 40g / L, and the flow acceleration rate is 0.1L / h; Plan B: demulsifier cationic alkyl glycoside demulsifier CAPG-131, formulated with a content of 38g / L Aqueous solution, flow acceleration rate 0.1L / h; Plan C: The demulsifier is the demulsifier cationic alkyl glycoside demulsifier CAPG-08143, which is prepared into an aqueous solution with a content of 42g / L, and the flow acceleration rate is 0.1L / h; Plan D: Break Emulsion TJ-3, prepared as an aqueous solution with a content of 42g / L, w...

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Abstract

The invention relates to a degreasing method of super heavy oil wastewater. A circulation bubble separation tower composed of a bubbling section and a foam section is adopted in degreasing of the super heavy oil wastewater; and batch type operation or continuous operation is adopted in the degreasing method. The degreasing method comprises the steps of: pumping wastewater into the bubbling section of the circulation bubble separation tower; feeding sodium hydroxide with a mass concentration of 20 percent or 0.1M hydrochloric acid to regulating pH to 8-9, introducing air from an air distributor, wherein throughput superficial vapor velocity is 0.5-1.5cm/s; feeding a demulsifier water solution, wherein the preparation volume concentration of the demulsifier water solution is the saturation concentration being 5-15 percent, and the feeding quantity is 0.1-0.5 percent of the volume of the bubbling section per hour; starting an oil scraper, collecting floating oil from an oil residue discharging hole at the bottom of the foam section, discharging wastewater without emulsified oil from a discharging hole at the bottom of the bubbling section, and when the removal rate of the emulsified oil is more than 90 percent, ending the operation of one batch. According to the degreasing method, once separation rate of the heavy emulsified oil is more than 90 percent.

Description

technical field [0001] The invention relates to a method for removing oil from oil refining and processing wastewater, in particular to a separation method for removing heavy emulsified oil from crude oil processing wastewater. Background technique [0002] The ultra-heavy oil wastewater contains a high amount of sludge, and the specific gravity of mineral oil is close to that of water. The crude oil particles are suspended in the water for a long time. In addition, the wastewater also contains a large amount of artificially synthesized organic polymer compounds and natural large molecular weight asphalt and colloidal substances. Under the action of gravity, the dispersed phase and the continuous phase in the wastewater are not easy to separate. The pH value of the wastewater is 7.79, weakly alkaline, brown, viscous, stable in the form of an emulsion, and difficult to degrade. [0003] The processing of ultra-heavy oil will produce a large amount of wastewater containing hea...

Claims

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Application Information

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IPC IPC(8): C02F1/40
Inventor 陈永立熊良铨聂春梅方新湘周华朱海霞于娟
Owner PETROCHINA CO LTD
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