A step-by-step separation method of mixed oil and water coupled with oil and gas washing

Abstract

The invention relates to a stepwise separation method of mixed oil and water coupled with oil and gas washing. First, light oil containing 0.5-6% synthetic water and low-separation gas containing trace hydrocarbons are mixed to wash hydrocarbon components, and then enter the oil-water preliminary separator from the left head, and sewage with 0.05-0.5% oil is sealed from the right The purified low-separation gas is discharged from the top, and the mixed liquid is discharged into the deep dehydrator, and the water content in the discharged light oil is about 0.05-0.5%. The discharge on the right side enters the deep degreaser, and the oil content in the discharged water is about 0.03-0.6%; after deep dehydration and dehydration, the water content in the light oil is less than 0.02% after relying on the combined fiber module woven in a special way in the deep dehydration and degreaser. After the oil content in the sewage is less than 0.01%, send it out separately. The invention adopts the method of combined oil-water separation and step-by-step separation to quickly and efficiently realize oil dehydration and sewage degreasing, and recover oil to the greatest 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.

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