A method for degreasing ceramic packing

Abstract

This invention discloses a method for degreasing ceramic packing, relating to the field of degreasing technology. The method involves preparing a degreasing solution, injecting it into the packed tower, and circulating it using a reflux pump. The degreasing solution includes sulfuric acid, potassium dichromate, and hydrogen peroxide. This invention employs an innovative degreasing solution that effectively removes siloxanes from the surface of the ceramic packing, significantly improving clogging and eliminating clogging issues after a period of use, thus meeting production requirements.

Description

Technical Field

[0001] This invention relates to the field of packing degreasing technology, and specifically to a method for degreasing ceramic packing. Background Technology

[0002] In the chemical industry, packing materials are often used in the production process. After repeated use, packing materials often cause blockage problems. Therefore, degreasing and cleaning are necessary. However, traditional degreasing methods, which use alkaline or acidic solutions, have poor degreasing effects and still cause feed blockage problems. Summary of the Invention

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a method for degreasing ceramic packings.

[0004] The technical solution of the present invention is as follows:

[0005] A method for removing oil from ceramic packing involves preparing an oil-removing solution, injecting the solution into the packed tower, and circulating and cleaning it using a reflux pump.

[0006] The degreasing solution includes sulfuric acid, potassium dichromate, and hydrogen peroxide.

[0007] As a preferred embodiment of the present invention, the concentration of the sulfuric acid is 94-98 wt%.

[0008] As a preferred embodiment of the present invention, the concentration of potassium dichromate is 5-10 wt%.

[0009] As a preferred embodiment of the present invention, the concentration of the hydrogen peroxide is 5-10 wt%.

[0010] As a preferred embodiment of the present invention, the volume ratio of sulfuric acid, potassium dichromate and hydrogen peroxide is 1:0.4-0.6:0.2-0.4.

[0011] As a preferred embodiment of the present invention, the cyclic cleaning time is 0.5-2 hours.

[0012] As a preferred embodiment of the present invention, the temperature of the degreasing solution during cleaning is controlled at 20-40℃.

[0013] Main reaction principle:

[0014] This is mainly because siloxanes are oxidized into silica; and because silica is light, it floats on the surface of concentrated sulfuric acid, making it easy to separate in the subsequent process.

[0015] The beneficial effects of this invention are: the degreasing method for ceramic packings of this invention uses an innovative degreasing liquid, which can effectively remove the siloxanes on the surface of the ceramic packings, thus greatly improving the clogging phenomenon. After a period of use, there is no clogging problem, which can meet the production requirements. Detailed Implementation

[0016] The embodiments of the present invention are described in detail below. These embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products.

[0017] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0018] All percentages below are mass percentages.

[0019] Example 1:

[0020] A mixture of 95% sulfuric acid, 10% potassium dichromate solution, and 5% hydrogen peroxide (volume ratio 1:0.5:0.3) was injected into the clogged packed tower. The tower was left to stand, and the volume reading was 5m. 3 The cleaning solution is circulated and cleaned using a reflux pump for 1 hour. The cleaning solution is then collected in a collection tank; the collected solution level is 5.05 m³. 3 After the liquid level is emptied, the siloxane on the ceramic packing basically falls off, the solution has obvious impurities, and the solution has no obvious temperature change.

[0021] After cleaning with water, the material is fed into production. The clogging problem is greatly improved, and there are no clogging issues after a period of use, which can meet production requirements.

[0022] Example 2:

[0023] A mixture of 95% sulfuric acid, 10% potassium dichromate solution, and 5% hydrogen peroxide (volume ratio 1:0.5:0.3) was injected into the clogged packed tower. The tower was left to stand, and the volume reading was 5m. 3 The cleaning solution is circulated using a reflux pump for 1.5 hours. The cleaning solution is then collected in a collection tank; the collected solution level is 5.06 m³. 3 After the liquid level is emptied, the siloxane on the ceramic packing is completely removed, the solution contains obvious impurities, and the solution does not show obvious temperature changes.

[0024] After cleaning with water, the material is fed into production. The clogging problem is greatly improved, and there are no clogging issues after a period of use, which can meet production requirements.

[0025] Comparative Example 1:

[0026] A 99.99% methanol solution was injected into the clogged packed tower, and the volume was 5m after standing. 3 The cleaning solution is circulated using a reflux pump for 1 hour. The cleaning solution is then collected in a collection tank, where the volume of the collected solution is 5.002 ml. 3 After the liquid level is emptied, the ceramic packing material is removed. There is no sign of siloxane falling off. The solution is clean and free of impurities. There is no significant temperature change in the solution.

[0027] After cleaning with water, the material was fed into the production line, but the blockage problem still existed, and the production requirements could not be met.

[0028] Comparative Example 2:

[0029] An alkaline solution (20% sodium hydroxide) was injected into the clogged packed tower. The volume was measured at 5m under static conditions. 3 The cleaning solution is circulated using a reflux pump for 1 hour. The cleaning solution is then collected in a collection tank, where the volume of the collected solution is 5.002 ml. 3 After the liquid level is emptied, the ceramic packing material is removed. There is no sign of siloxane falling off. The solution is clean and free of impurities. There is no significant temperature change in the solution.

[0030] After cleaning with water, the material was fed into the production line, but the blockage problem still existed, and the production requirements could not be met.

[0031] Comparative Example 3:

[0032] Inject 30% hydrochloric acid solution into the clogged packed tower. The column was left to stand and the reading was 5m. 3 The cleaning solution is circulated and cleaned using a reflux pump for 1 hour. The cleaning solution is then collected in a collection tank, and the collected solution level is 5.004 m³. 3 After the liquid level was emptied, the ceramic packing was removed. There was no obvious sign of siloxane falling off, and there were a small amount of black impurities in the solution.

[0033] After cleaning with water, the material was fed into the production line, but the blockage problem still existed, and the production requirements could not be met.

[0034] Comparative Example 4:

[0035] Sulfuric acid (75%) was injected into the clogged packed tower, and the volume was 5m under static conditions. 3 The cleaning solution is circulated using a reflux pump for 1 hour. The cleaning solution is then collected in a collection tank, where the volume of the collected solution is 5.01 m³. 3 After the liquid level was drained, some of the siloxane on the ceramic packing showed signs of detachment, the solution contained obvious impurities, and the solution did not show obvious temperature changes.

[0036] After cleaning with water, the material was fed into production, which improved the clogging problem, but the clogging issue still existed and could not meet the requirements for long-term production.

[0037] Comparative Example 5:

[0038] Sulfuric acid (95%) was injected into the clogged packed tower, and the volume was 5m when the tower was left to stand. 3 The cleaning solution is circulated using a reflux pump for 1 hour. The cleaning solution is then collected in a collection tank; the collected solution level is 5.01 m³. 3 After the liquid level was drained, some of the siloxane on the ceramic packing showed signs of detachment, the solution contained obvious impurities, and the solution did not show obvious temperature changes.

[0039] After cleaning with water, the material was fed into production, which improved the clogging problem, but the clogging issue still existed and could not meet the requirements for long-term production.

[0040] Comparative Example 6:

[0041] A solution of 75% sulfuric acid and 10% potassium dichromate (volume ratio 1:0.5) was injected into the clogged packed tower. The volume reading was 5m under static conditions. 3 The cleaning solution is circulated using a reflux pump for 1 hour. The cleaning solution is then collected in a collection tank; the collected solution level is 5.02 m³. 3 After the liquid level was drained, the ceramic packing showed obvious signs of detachment of siloxane, the solution contained obvious impurities, and the solution did not show obvious temperature changes.

[0042] After cleaning with water, the material was fed into production, which significantly improved the clogging problem. However, after a period of use, the clogging problem still existed and could not meet the requirements for long-term production.

[0043] Comparative Example 7:

[0044] A solution of 95% sulfuric acid and 10% potassium dichromate (by volume) in a 1:0.5 ratio was injected into the clogged packed tower. The volume reading was 5m under static conditions. 3 The cleaning solution is circulated and cleaned using a reflux pump for 1 hour. The cleaning solution is then collected in a collection tank; the collected solution level is 5.03 m³. 3 After the liquid level was drained, the ceramic packing showed obvious signs of detachment of siloxane, the solution contained obvious impurities, and the solution did not show obvious temperature changes.

[0045] After cleaning with water, the material was fed into production, which significantly improved the clogging problem. However, after a period of use, the clogging problem still existed and could not meet the requirements for long-term production.

[0046] Examples 1-2 and Comparative Examples 1-7 were tested, and the test results are shown in Table 1.

[0047] The siloxane content in Comparative Example 1 was detected by chromatography, while the other comparative examples and examples were detected by COD.

[0048] Table 1 shows the test results for Comparative Examples 1-7 and Examples 1 and 2.

[0049]

[0050]

[0051] As can be seen from the table above, Examples 1 and 2 have better cleaning effects and only require cleaning at room temperature. After cleaning, the siloxane on the surface of the ceramic packing is effectively removed, which effectively improves the problem of feed blockage in the packed tower. This is mainly because the siloxane is oxidized into silica, and silica is light and floats on the surface of concentrated sulfuric acid, making it easy to separate in the future.

[0052] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.

[0053] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of the present invention.

Claims

1. A method for degreasing ceramic packing, characterized in that, Prepare the degreasing solution, inject it into the packed tower, and circulate it through a reflux pump for cleaning. The degreasing solution includes sulfuric acid, potassium dichromate, and hydrogen peroxide; The concentration of the sulfuric acid is 94-98 wt%; The concentration of potassium dichromate is 5-10 wt%; The concentration of the hydrogen peroxide is 5-10 wt%; The volume ratio of sulfuric acid, potassium dichromate, and hydrogen peroxide is 1:0.4-0.6:0.2-0.4; the circulation cleaning time is 0.5-2 hours; and the temperature of the degreasing solution during cleaning is controlled at 20-40°C.

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