Ketone-benzene dewaxing apparatus capable of reducing deoiling fresh solvent

Abstract

The present invention discloses a ketone-benzene dewaxing apparatus capable of reducing a deoiling fresh solvent. The ketone-benzene dewaxing apparatus comprises a heat exchanger unit, a dewaxing unit, a primary deoiling unit, a secondary deoiling unit and a raw material oil pumping-into heat exchanger unit, wherein the units are sequentially connected. The ketone-benzene dewaxing apparatus is further added with a first segment deoiling filtrate self-circulation pipeline and a second segment deoiling filtrate self-circulation pipeline, wherein a pipeline is led out from a pumping-out port of a first segment deoiling filtrate pump, and is introduced to a dewaxing wax tank so as to be adopted as a first segment deoiling filtrate self-circulation flow process, and a pipeline is led out from a pumping-out port of a second segment deoiling filtrate pump, and is introduced to the first segment dewaxing wax tank so as to be adopted as a second segment deoiling filtrate self-circulation flow process. According to the present invention, with the first segment deoiling filtrate self-circulation, the use amount of the second segment deoiling filtrate adopted as the first segment deoiling dilution solvent is reduced so as to provide assurance for the second segment deoiling filtrate self-circulation and ensure material balance; and with the second segment deoiling filtrate self-circulation, the use amount of the second segment deoiling fresh dilution solvent is reduced so as to reduce a fresh solvent circulation amount of the apparatus, reduce energy consumption, and provide advantages of low fresh solvent ratio and low load on the recovery system.

Description

technical field [0001] The invention relates to ketone-benzene dewaxing equipment in petrochemical industry, in particular to a ketone-benzene dewaxing device capable of reducing fresh solvent for deoiling. Background technique [0002] The ketone-benzene dewaxing unit is an important device in the production of lubricating oil. Its main function is to remove wax with a high freezing point in the lubricating oil, reduce the freezing point of the oil, improve the low-temperature fluidity of the oil, and obtain a lubricating oil that meets the requirements of low-temperature use. . The dewaxed wax paste is then deoiled to obtain paraffin materials that meet the quality requirements of paraffin products. The ketone-benzene dewaxing unit generally includes four major systems: freezing, crystallization, filtration and recovery. The refrigeration system provides cooling capacity for the crystallization system. The crystallization system controls the crystallization conditions to...

AI Technical Summary

Problems solved by technology

[0007] (1) In the above-mentioned "three-stage filtrate countercurrent" dewaxing device, since the dilution solvents of the second-stage deoiling system are all fresh solvents, that is, the solutions injected into the first-stage deoiling solid-phase container 406 are all fresh solutions, resulting in fresh solvents in the deoiling system. The demand for solvent is large. Since the fresh solvent needs to be used in the dewaxing process through cooling and recovery, the large amount of fresh solvent used leads to high energy consumption in the entire production process.

[0008] (2) In the "three-stage filtrate countercurrent" production process, since all the dilution solvents in the second-stage deoiling system are fresh solvents, the ratio of fresh solvents in the deoiling system is large and the energy consumption is high

[0009] (3) In the above-mentioned "three-stage filtrate countercurrent" dewaxing device, one stage of deoiling filtrate is divided into two paths, one path is connected to the first heat exchanger 201 for dewaxing primary and secondary dilution solvents, and the other path is connected to the oil recovery system under wax , the amount of filtrate entering the wax oil recovery system is large, and the load of the wax oil recovery system is large, which increases the energy consumption of wax oil recovery

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