Step-by-step oil-water mixture separation method coupled with oil gas washing

Abstract

The invention relates to a step-by-step oil-water mixture separation method coupled with oil gas washing. The method comprises the following steps: first light oil containing 0.5-6 percent of synthetic water and low-pressure separator gas containing a trace amount of hydrocarbon are mixed and washed, then the light oil containing a trace amount of hydrocarbon flows into a primary oil-water separator from a left sealing head, and wastewater containing 0.05-0.5 percent of oil flows into the primary oil-water separator from a right sealing head; purified low-pressure separator gas is discharged from the top, mixed liquid is discharged into a deep dehydrater, and about 0.05-0.5 percent of water is removed from the light oil; wastewater on the left side flows into a water drum to be discharged, oil-removed wastewater on the right side is discharged nearby the right side of partition board into a deep oil remover, and about 0.03-0.6% of oil is removed from the water; by virtue of deep dehydration as well as oil removal and dehydration by a specially knitted conjugate fiber module in the oil remover, after the water content in the light oil is smaller than 0.02% and the oil content in the water is smaller than 0.01, the light oil and the water are transported outside. According to the method oil-water separation and step-by-step separation are combined, oil dehydration and wastewater oil removal can be realized rapidly and efficiently and oil is recycled to the maximum extent.

Description

technical field [0001] The invention relates to the field of petroleum refining or coal chemical industry, and relates to a method for stepwise separation of mixed oil and water coupled with oil and gas washing in the Fischer-Tropsch process. Background technique [0002] Fischer-Tropsch synthesis (Fischer-Tropsch synthesis) is one of the indirect coal liquefaction technologies, which can be referred to as FT reaction for short. It uses synthesis gas (CO and H 2 ) is a process of synthesizing paraffin-based liquid fuels with catalysts (mainly iron) and appropriate reaction conditions as raw materials. Fischer-Tropsch coal-to-oil products mainly include gasoline, diesel, kerosene, aviation fuel, lubricating oil and paraffin. The indirect liquefaction product of Fischer-Tropsch synthetic coal is a mixture of oil and water, and the efficient separation of oil and water has an important impact on reducing product costs. [0003] At present, the method of gravity sedimentation ...

AI Technical Summary

Problems solved by technology

The equipment occupies a large area, consumes a lot of materials and has low efficiency

In addition, the gas phase components discharged after low-pressure separation in the process flow also contain a small amount of hydrocarbons. Generally, a separate washing device is installed for washing and recovery, and a supporting operation control system is required, which is expensive and complicated.

Images