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A kind of solvent dilution and cold washing method for ketone-benzene dewaxing process

A ketone benzene dewaxing and solvent technology, which is applied in the field of solvent dilution and cold washing in the ketone benzene dewaxing process, can solve the problems of non-targeted solvent, large solvent consumption and high energy consumption, so as to reduce solvent consumption and energy consumption. , improve the effect of selectivity

Active Publication Date: 2017-07-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the same solvent is added at different dilution points and cold washing points, and the solvent used is not targeted, resulting in a large amount of solvent and high energy consumption in the process of ketone-benzene dewaxing

Method used

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  • A kind of solvent dilution and cold washing method for ketone-benzene dewaxing process

Examples

Experimental program
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Effect test

Embodiment 1

[0051] In this embodiment, a conventional ketone-benzene dewaxing device is used to treat a certain second-line oil. During the ketone-benzene dewaxing process of the second-line oil, the solvent dilution and cold washing method provided by the embodiment of the present invention is used. attached figure 1 The flow chart of the solvent dilution and cold washing method used in the ketone-benzene dewaxing process provided in this example, wherein the raw material dilution points of the tertiary cooling crystallization part are from left to right the primary dilution point of the raw material and the secondary dilution point of the raw material , the three dilution points of raw materials; the primary recovery towers of dewaxed oil, waxed oil and deoiled wax refer to the primary recovery tower containing dewaxed oil, the primary recovery tower of waxed oil and the primary recovery of deoiled wax towers; correspondingly, each secondary recovery tower for dewaxed oil, underwax oil,...

Embodiment 2

[0062] The operation steps of this embodiment are basically the same as those of Example 1, the difference is that the mass fraction of methyl ethyl ketone in the solvent added at the second-stage deoiling cold wash point and the subsequent raw material primary dilution point in this embodiment is 76%; The mass fraction of butanone in the solvent added at the cold wash point and the second dilution point of the subsequent raw materials is 69%; the mass fraction of butanone in the solvent added at the dewaxing cold wash point and the third dilution point of the subsequent raw materials is 57%.

[0063] Through this embodiment, the dilution solvent and the cold wash solvent from each dilution point and cold wash point are different in composition, and the targeted effect of the solvent is fully exerted, which is beneficial to the growth of wax crystals, and the wax yield increases by 2%, and reduces The amount of solvent used is 6%, and the energy consumption consumed in the reco...

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Abstract

The invention discloses a solvent dilution and cold washing method used in the ketone-benzene dewaxing process, and belongs to the technical field of ketone-benzene dewaxing. The method comprises: recovering respectively the solvent distilled from the top of each primary recovery tower, each secondary recovery tower, each third recovery tower and each four recovery towers of dewaxed oil, wax bottom oil and deoiled wax, correspondingly As the first solvent, the second solvent, the third solvent and the fourth solvent in which the mass fraction of butanone is 70-80%, 65-75%, 55-65% and 40-55%, respectively. At least two of the first solvent, the second solvent, the third solvent and the fourth solvent are used to prepare a composite solvent with a mass fraction of butanone of 50-80%. At different dilution points and cold wash points, add different concentrations of the above solvents. The invention can reduce the amount of solvent used and the energy consumption of the ketone-benzene dewaxing process by adding appropriate proportions of solvents to different dilution points and cold washing points in a targeted manner, facilitates the formation and growth of wax crystals, and improves the filtration speed.

Description

technical field [0001] The invention relates to the technical field of ketone-benzene dewaxing, in particular to a solvent dilution and cold washing method used in the ketone-benzene dewaxing process. Background technique [0002] Ketobenzene dewaxing refers to the production of dewaxed oil, deoiled wax and by-product waxed oil by using the second and third fractions in petrochemical industry as raw materials, generally including freezing, crystallization, filtration and recovery systems. The principle of ketone-benzene dewaxing is to reduce the distillate oil and the third distillate oil after cooling down, and the wax crystals with high freezing point will be precipitated. As the temperature drops, the viscosity of the raw oil and the concentration of wax crystals will increase. In order to reduce the viscosity of the raw material oil and the concentration of wax crystals, make the wax form a good crystal, and reduce the material conveying resistance, use the characteristi...

Claims

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Application Information

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IPC IPC(8): C10G73/22C10G73/32
Inventor 崔久涛诸若琴冯宝林张北屿田晓良王俊何晓昶
Owner BC P INC CHINA NAT PETROLEUM CORP