Sulfolane purification device

Abstract

The utility model relates to the field of petrochemical engineering, and particularly discloses a sulfolane purifying device, which comprises a mixing tank and a separator, the mixing tank is used for mixing sulfolane and a solid purifying agent, the separator is used for separating sulfolane and the solid purifying agent, and the bottom of the mixing tank is connected with the separator. The separator is provided with a distribution disc, and the distribution disc comprises a plurality of distribution pipes which are communicated with one another. Each distribution pipe is independently provided with one or more connectors, each connector is connected with a filter grid, and the filter grids are used for filtering solid purifying agents. The device is further provided with a suction pump, one of the distribution pipes is connected with an inlet of the suction pump, and the suction pump is used for pumping out materials in the separator. Through the device, colored substances, acidic substances and hydrocarbon substances in the sulfolane can be purified and removed, so that the extraction performance of the sulfolane is recovered.

Description

Technical Field

[0001] The utility model relates to the field of petrochemical industry, in particular to a sulfolane purification device. Background Art

[0002] Since the late 1950s, sulfolane has been used as a solvent for aromatic extraction. It is widely considered to be an ideal solvent in the aromatic extraction process because of its high solubility and selectivity for aromatics (high aromatic yield), large density difference with crude oil and boiling point difference with gasoline aromatics (facilitating two-phase separation and solvent recovery), low latent heat of evaporation and specific heat (relatively low energy consumption).

[0003] However, during industrial operation, sulfolane will gradually deteriorate, causing the color to gradually darken and blacken, the pH value to drop, causing equipment corrosion and deposits to form, and reducing its extraction performance, which seriously affects the normal operation of the device and increases the loss of solvent. At present, the widely used countermeasure at home and abroad is to inject organic amines (such as monoethanolamine) to inhibit equipment corrosion caused by the decrease in pH value, but the effect is not satisfactory. Utility Model Content

[0004] In order to overcome the problem of poor effect of existing sulfolane purification technology, the utility model provides a sulfolane purification device to simplify the sulfolane purification process and reduce the difficulty of sulfolane purification.

[0005] In order to achieve the above-mentioned object, the utility model provides a sulfolane purification device on one hand, the device comprises a mixing tank and a separator, the mixing tank is used to mix sulfolane and a solid purifier, the separator is used to separate sulfolane and the solid purifier, and the bottom of the mixing tank is connected to the separator;

[0006] The separator is provided with a distribution plate, and the distribution plate includes a plurality of distribution pipes that are interconnected;

[0007] Each distribution pipe is independently provided with one or more interfaces, each interface is connected to a filter grid, and the filter grid is used to filter the solid purifier;

[0008] The device is also provided with a suction pump, one of the plurality of distribution pipes is connected to the inlet of the suction pump, and the suction pump is used to extract the material in the separator.

[0009] Through the above device, the colored substances, acidic substances and hydrocarbons that may exist in sulfolane can be adsorbed or reacted, and then separated, which greatly simplifies the purification process of sulfolane and reduces the difficulty of sulfolane purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1It is a schematic diagram of the sulfolane purification device provided by the utility model;

[0011] Figure 2 It is a schematic cross-sectional view of the separator at the distribution plate location.

[0012] Description of Reference Numerals

[0013] 1-mixing tank, 2-separator, 3-stirring motor, 4-stirring machine, 5-first valve, 6-circulation pump, 7-second valve, 8-third valve, 9-multi-layer plate filter grid, 10-distribution plate, 11-bottom filter, 12-fastener, 13-bottom screw cap, 14-suction pump, 15-fourth valve, 16-fifth valve, 17-sixth valve, 18-seventh valve, 19-eighth valve, 20-ninth valve, 21-collecting pipe, 22-interface. DETAILED DESCRIPTION

[0014] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0015] The utility model provides a sulfolane purification device, which comprises a mixing tank 1 and a separator 2. The mixing tank 1 is used for mixing sulfolane and a solid purifying agent, the separator 2 is used for separating sulfolane and the solid purifying agent, and the bottom of the mixing tank 1 is connected to the separator.

[0016] The separator 2 is provided with a distribution plate 10, and the distribution plate 10 includes a plurality of distribution pipes that are interconnected;

[0017] One or more interfaces 22 are independently provided on each distribution pipe, and each interface 22 is connected to a filter grating 9, and the filter grating 9 is used to filter the solid purifying agent.

[0018] The device is further provided with a suction pump 14 , one of the plurality of distribution pipes is connected to the inlet of the suction pump 14 , and the suction pump 14 is used to extract the material in the separator 2 .

[0019] According to the present invention, preferably, the filter grating 9 is vertically arranged in the separator 2 .

[0020] According to the utility model, preferably, the top of the mixing tank 1 is open or provided with an openable and closable top cover, and the solid purifier used for purifying sulfolane is put into the mixing tank through the top of the mixing tank 1.

[0021] According to the utility model, preferably, a sulfolane inlet is provided on the top or side wall of the mixing tank 1 .

[0022] According to a preferred embodiment of the utility model, the mixing tank 1 is provided with a stirring motor 3 and a stirrer 4, and the stirrer 4 is connected to the stirring motor 3. Under the stirring of the stirrer 4, the solid purifier fully contacts and reacts with sulfolane, and the colored substances, acidic substances and hydrocarbon substances in the sulfolane can be removed.

[0023] The utility model has a wide range of choices for the agitator, and those skilled in the art can make conventional choices. According to a preferred embodiment of the utility model, the agitator 4 is selected from a single-layer or multi-layer paddle agitator, a turbine agitator and an anchor agitator.

[0024] The filter screen is provided on the filter grid. The utility model has a wide range of selection of the material and aperture of the filter screen, and those skilled in the art can make conventional selections. According to the utility model, preferably, the material of the filter screen is selected from one or more of stainless steel, sintered stainless steel and polypropylene.

[0025] According to the utility model, preferably, the filter grating 9 is a multi-layer plate filter grating.

[0026] According to the utility model, preferably, the distribution plate 10 is horizontally arranged at the lower part of the separator 2 .

[0027] According to the utility model, preferably, the plurality of distribution pipes are distributed radially. More preferably, the distribution pipes are evenly distributed, that is, the angles between each pair of adjacent distribution pipes are equal.

[0028] According to a preferred embodiment of the utility model, the separator 2 is provided with an openable and closable bottom screw cap 13 and a fastener 12 for fastening the bottom screw cap, so that the solid purifier after use can be discharged through the bottom of the separator. The fastener has a certain fastening ability, which can ensure that the material in the separator does not leak out. According to the utility model, preferably, the fastener is a pneumatic or electric hydraulic switch. The hydraulic switch has a certain fastening ability, which can ensure that the liquid in the separator 2 does not leak out.

[0029] According to a preferred embodiment of the present invention, a bottom filter and a material outlet are provided on the bottom rotary cover 13, and the material outlet is connected to the inlet of the suction pump. The suction pump can extract the material filtered by the bottom filter through the material outlet on the bottom rotary cover of the separator.

[0030] According to a preferred embodiment of the present invention, a gas pipeline is connected to the top or side wall of the separator 2 and the distribution pipe connected to the inlet of the suction pump 14, and the other end of the gas pipeline is connected to a gas source. Inert gas is blown into the separator through the gas pipeline to purge the residual material in the separator.

[0031] According to a preferred embodiment of the utility model, the mixing tank 1 is further provided with a bypass, one end of which is connected to the bottom of the mixing tank 1, and the other end is connected to the top or side wall of the mixing tank 1, and the bypass is also provided with a circulation pump 6. The material circulates through the bypass, which can enhance mixing.

[0032] The following is a description of the process steps for purifying sulfolane in conjunction with a specific device:

[0033] like Figure 1 The device shown, wherein Figure 2 As shown, the distribution plate 10 is provided with 6 radially evenly distributed distribution pipes, one of which is connected to the suction pump 14. The specific process steps are as follows:

[0034] (1) Open the sixth valve 17 and inject the sulfolane to be purified into the mixing tank 1, while keeping the other valves closed.

[0035] (2) After the sulfolane to be purified in the mixing tank has a liquid level that is above the agitator blades, the sixth valve 17 is closed.

[0036] Stop filling (the amount of sulfolane to be purified should not exceed 2 / 3 of the volume of the mixing tank).

[0037] (3) adding a solid purifier from the top of the mixing tank 1, wherein the mass ratio of sulfolane to the solid purifier is 30-1000:1, preferably 30-500:1, and more preferably 50-300:1.

[0038] (4) Turn on the agitator motor 3 and use the agitator 4 to stir.

[0039] (5) Open the first valve 5 and the second valve 7, and simultaneously turn on the circulation pump 6 to enhance mixing through bypass.

[0040] (6) After stirring for 10-60 min to allow the sulfolane to be purified and the solid purifier to be fully mixed and reacted, the third valve 8 is opened, the second valve 7 is closed, and the mixture of the purified sulfolane and the solid purifier is pumped into the separator 2.

[0041] (7) After all the mixture is pumped into the separator, the first valve 5 and the third valve 8 are closed and the circulation pump 6 is turned off, while the fifth valve 16 and the ninth valve 20 are opened and the suction pump 14 is turned on. After the mixture is filtered by the multi-layer plate filter 9, the liquid therein is pumped out through the distribution pipe connected to the suction pump 14.

[0042] (8) When the liquid level in the separator drops below the lowest point of the multi-layer plate filter grid 9, the fourth valve 15 is opened and the fifth valve 16 is closed. After the mixture is filtered by the bottom filter 11, the liquid therein is extracted through the material outlet provided on the screw cap 13 at the bottom of the separator.

[0043] (9) After no more liquid is extracted from the separator, close the valve 20 and the suction pump 14, open the seventh valve 18, and blow 0.3-1 MPa, preferably 0.4-0.6 MPa, of nitrogen into the separator to blow out the multi-layer plate filter 9, the bottom filter 11, and the residual sulfolane in the pipeline.

[0044] (10) Open the fastener 12 and the bottom screw cap 13 of the separator, open the eighth valve 19, blow 0.3-1 MPa, preferably 0.4-0.6 MPa, of nitrogen into the distribution plate, blow out the solid purifier covering the multi-layer plate filter 9 and the bottom filter 11, and discharge it through the bottom of the separator.

[0045] The present invention will be described in detail below through embodiments:

[0046] In the following examples, the sulfolane sample to be purified was taken from the reforming oil extraction section of the refinery of PetroChina Lanzhou Petrochemical Company. The properties of the sulfolane sample to be purified are shown in Table 1.

[0047] Table 1

[0048] Characteristics Impurity Type Is the liquid surface stratified? After sampling, let it stand for 2 hours and the liquid surface will be separated. Hydrocarbons pH 5.3 Acidic substances color black Colored substances

[0049] The sulfolane sample to be purified showed stratification when left to stand, indicating that it contained hydrocarbon substances; the pH of the sulfolane sample was 5.3, indicating that it contained acidic substances; the sulfolane sample was dark in color, indicating that it contained colored substances.

[0050] Example

[0051] 50 parts by mass of activated carbon, 10 parts by mass of attapulgite, 10 parts by mass of clay, 10 parts by mass of alumina, 10 parts by mass of diatomaceous earth, and 10 parts by mass of brucite were mechanically blended to prepare a powdered sulfolane purifier A1.

[0052] The specific surface area of ​​purifier A1 was 870 m2 / g as determined by the BET method.

[0053] According to the process steps of the specific implementation method, use Figure 1 , Figure 2 The device shown purifies sulfolane, the mass ratio of sulfolane to be purified to purifier A1 is 100:1, the mixing time is 30 min, and the mixing temperature is 25° C. The properties of the purified sulfolane are shown in Table 2.

[0054] Table 2

[0055] Characteristics illustrate Is the liquid surface stratified? After sampling, let it stand for 2 hours, and there is no stratification on the liquid surface Hydrocarbons are removed pH 8.9 Acidic substances are removed color Colorless and transparent Colored matter is removed

[0056] It can be seen from the results of the above embodiments that the purification device provided by the utility model can adsorb or react colored substances, acidic substances and hydrocarbons that may exist in sulfolane, and then separate them, which greatly simplifies the purification process of sulfolane and reduces the difficulty of purifying sulfolane.

[0057] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including combining various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A sulfolane purification device, characterized in that: The device comprises a mixing tank (1) and a separator (2), wherein the mixing tank (1) is used to mix sulfolane and a solid purifier, and the separator (2) is used to separate sulfolane and the solid purifier, and the bottom of the mixing tank (1) is connected to the separator (2); The separator (2) is provided with a distribution plate (10), and the distribution plate (10) comprises a plurality of distribution pipes that are interconnected; Each distribution pipe is independently provided with one or more interfaces (22), each interface (22) is connected to a filter grid (9), and the filter grid (9) is used to filter the solid purifying agent; The device is also provided with a suction pump (14), one of the plurality of distribution pipes is connected to the inlet of the suction pump (14), and the suction pump (14) is used to extract the material in the separator (2).

2. The device according to claim 1, characterized in that The mixing tank (1) is provided with a stirring motor (3) and a stirrer (4), and the stirrer (4) is connected to the stirring motor (3).

3. The device according to claim 2, characterized in that The stirrer (4) is selected from a single-layer or multi-layer paddle stirrer, a turbine stirrer and an anchor stirrer.

4. The device according to claim 1, characterized in that The filter grating (9) is a multi-layer plate filter grating.

5. The device according to claim 1, characterized in that The distribution plate (10) is horizontally arranged at the lower part of the separator (2).

6. The device according to claim 5, characterized in that The plurality of distribution pipes are distributed radially.

7. The device according to any one of claims 1 to 6, characterized in that: The separator (2) is provided with an openable and closable bottom screw cover (13) and a fastener (12) for fastening the bottom screw cover.

8. The device according to claim 7, characterized in that The bottom rotary cover (13) is provided with a bottom filter and a material outlet.

9. The device according to claim 1, characterized in that A gas pipeline is also connected to the top or side wall of the separator (2) and the distribution pipe connected to the inlet of the suction pump (14), and the other end of the gas pipeline is connected to a gas source.

10. The device according to any one of claims 1, 8-9, characterized in that: The mixing tank (1) is also provided with a bypass, one end of which is connected to the bottom of the mixing tank (1), and the other end of which is connected to the top or side wall of the mixing tank (1); A circulation pump (6) is also provided on the bypass.

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