Chemical hot wash method and system for oil-containing sludge

By employing steps such as crushing, screening, centrifugation, preheating liquefaction, hot water hydrolysis, flash evaporation, and demulsification, combined with catalytic conditioning agents and demulsifiers, the low efficiency of chemical thermal washing methods has been solved, achieving efficient treatment of oily sludge, reducing pollution from solid and liquid phase wastes, and improving mineral oil recovery rates.

CN122301422APending Publication Date: 2026-06-30CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2024-12-27
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing chemical thermal washing methods are inefficient in treating oily sludge, resulting in substandard residual solid phases after treatment, which can easily lead to secondary pollution.

Method used

Through steps such as crushing, screening, centrifugal separation, preheating liquefaction, hot water hydrolysis, flash evaporation and demulsification, combined with the use of catalytic conditioning agents and demulsifiers, multi-stage separation and treatment are achieved, thereby improving the efficiency of oil sludge treatment.

Benefits of technology

It significantly improves the treatment efficiency of oily sludge, reduces the oil content of solid waste, ensures that liquid waste meets the influent water quality requirements of sewage treatment plants, increases the mineral oil recovery rate, and achieves a treatment capacity of 96.4-102.8%, while reducing costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application provides a chemical thermal washing method and system for oily sludge. The method includes: crushing, screening, and washing the oily sludge to obtain a first solid phase product and a first liquid phase product; performing a first centrifugal separation on the first liquid phase product to obtain a second solid phase product and a second liquid phase product; preheating and liquefying the second solid phase product to obtain a first mixed product; mixing the first mixed product with a catalytic conditioning agent and performing a hot water hydrolysis reaction to obtain a second mixed product; flash evaporating the second mixed product to obtain a third mixed product; mixing the second liquid phase product and the third mixed product with a demulsifier and performing a demulsification treatment to obtain a fourth mixed product; and performing multi-stage separation on the fourth mixed product to obtain a first aqueous phase product, a first oil phase product, and a third solid phase product. This method solves the technical problem of low processing efficiency in existing chemical thermal washing methods.
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