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Dirty oil floated oily sludge dewatering treatment method

A treatment process and scum technology, applied in the directions of grease/oily substance/float removal device, liquid separation, immiscible liquid separation, etc. The effect of environmental pollution, reduction of processing losses, and elimination of scum from leaving the factory

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the scum also contains a certain amount of oil, direct discharge is wasteful and pollutes the environment.
At present, there are two main problems in the treatment method of scum, one is that the dehydration rate of scum treatment is insufficient, and the other is that the fluidity of scum is affected after the scum shrinkage treatment, and pumping can no longer be carried out

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Distillation method and Karl Fischer method are used to analyze the water content of the sewage oil scum extracted from the demulsification tank; the sewage oil scum with a water content of 95% is obtained. Dirhamnolipid with a biosurfactant purity of 99% was continuously added to the sewage oil scum. Rhamnolipids were diluted to a mass concentration of 0.5% before being continuously added to the demulsification environment. Carry out dehydration reaction, the amount of rhamnolipid added is 700ppm, the dehydration reaction temperature is 55°C, the pH is adjusted to 5, and the rotation speed is stirred at 100rpm. After the rhamnolipid and the dirty oil scum are mixed, then let it stand for 2 hours. Solid scum and oil float up, and the lower layer is a relatively clear water layer. After adjusting the pH value of the water in the water layer to 6~7, it can be discharged. The dehydration rate can reach more than 84.5%; the obtained concentrated scum still has good fluidi...

Embodiment 2

[0020] Distillation method and Karl Fischer method are used to analyze the water content of the sewage oil scum extracted from the demulsification tank; the sewage oil scum with a water content of 99% is obtained. Continuously add biosurfactant dirhamnolipid with a purity of 99% to the dirty oil scum. Rhamnolipids were diluted to 1% mass concentration before being continuously added to the demulsification environment. The dehydration reaction was carried out, the rhamnolipid addition amount was 400 ppm, the dehydration reaction temperature was 60° C., the pH was adjusted to 5, and the rotation speed was 80 rpm. Stir until the rhamnolipid and dirty oil scum are evenly mixed, then let stand for 5 hours, the solid scum and oil float up, and the lower layer is a relatively clear water layer. After adjusting the pH value of the water in the water layer to 6~7, it can be discharged. The dehydration rate can reach more than 81.7%; the obtained concentrated scum still has good fluid...

Embodiment 3

[0022] Distillation method and Karl Fischer method are used to analyze the water content of the sewage oil scum extracted from the demulsification tank; the sewage oil scum with a water content of 90% is obtained. Dirhamnolipid with a biosurfactant purity of 99% was continuously added to the sewage oil scum. Rhamnolipids were diluted to 1% mass concentration before being continuously added to the demulsification environment. The dehydration reaction was carried out, the rhamnolipid addition amount was 1000 ppm, the dehydration reaction temperature was 45° C., the pH was adjusted to 5, and the rotation speed was 80 rpm. Stir until the rhamnolipid and dirty oil scum are evenly mixed, then let stand for 10 minutes, the solid scum and oil float up, and the lower layer is a relatively clear water layer. After adjusting the pH value of the water in the water layer to 6~7, it can be discharged. The dehydration rate can reach more than 63%; the obtained concentrated scum still has g...

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Abstract

The invention discloses a dirty oil floated oily sludge dewatering treatment method, and belongs to the technical field of petroleum waste residue treatment. According to the dirty oil floated oily sludge dewatering treatment method, biosurfactant rhamnolipid is added into dirty oil floated oily sludge continuously for dewatering, wherein adding amount of rhamnolipid is controlled to be 400 to 1000ppm, dewatering temperature is controlled to be 45 to 60 DEG C, pH value is adjusted to 4 to 5, rhamnolipid is uniformed mixed with the dirty oil floated oily sludge via stirring, and an obtained mixture is allowed to stand for 10min to 5h, so that solid floated oily sludge and oil float upwards, and a lower layer is a relatively clear water layer; after demulsification treatment of the dirty oil floated oily sludge with rhamnolipid, dewatering rate is higher than 60 to 70%, obtained concentrated floated oily sludge still possesses excellent fluidity, requirements of pumping are satiasfied, the floated oily sludge is subjected to coking treatment to avoid discharge of the floated oily sludge; processing cost is reduced, environmental protection benefits are achieved, and environment pollution on surrounding areas is reduced.

Description

technical field [0001] The invention discloses a dehydration treatment process for waste oil scum, which belongs to the technical field of petroleum waste treatment. Background technique [0002] The vast majority of petrochemical or oil extraction companies produce waste oil containing water and slag, which cannot directly enter the processing process and is often stored as waste. At home and abroad, mechanical methods such as mechanical centrifugation and ultrasound combined with chemical demulsification are commonly used to treat heavy dirty oil. However, due to the limited demulsification ability of chemically synthesized surfactants, the water content of the obtained oil is basically in the range of 5-10%, which cannot meet the requirements. Refining requires that the water content of crude oil be less than 1.5%. [0003] Floated oily sludge in refineries is a typical O / W crude oil emulsion. The direct discharge of these crude oil emulsions will seriously endanger the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/05B01D17/02C02F1/40
Inventor 孙冠嵩孟琴梁颖杰韩莉郑华桂王顺利曹庆志谭克峰张占昭朱利军
Owner CHINA PETROLEUM & CHEM CORP
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