Butter soil on-line cleaning agent, its preparation method and application

Abstract

The application discloses a butter dirt on-line cleaning agent and a preparation method and application thereof. The butter dirt on-line cleaning agent comprises the following components in mass percentage: alkyl polyglycoside 8-20 wt%, fatty alcohol polyoxyethylene ether compound 8-25 wt%, composite chelating agent 10-15 wt%, methyl lactate 10-20 wt%, and the rest is deionized water; wherein the composite chelating agent is a mixture of sodium gluconate and glutamic acid. The butter dirt on-line cleaning agent is uniform and stable, can quickly remove butter dirt in an alkali washing tower of an ethylene production device, and is extremely convenient to operate when used, without stopping and opening the tank for cleaning, only needing to be added into the alkali washing tower with alkali liquor. Meanwhile, raw materials of the butter dirt on-line cleaning agent are non-toxic and non-polluting, the preparation method is simple, and the butter dirt on-line cleaning agent is suitable for large-scale production and application in industry.

Description

An online butter stain remover, its preparation method and application Technical Field

[0001] This invention relates to the field of chemical product technology, specifically to an online grease stain remover, its preparation method, and its application. Background Technology

[0002] Ethylene is an important basic chemical raw material. Currently, ethylene production in my country involves multiple processes, including naphtha steam cracking and coal-to-olefins, operating simultaneously. During ethylene production, in addition to low-carbon olefins, the reaction products at high temperatures also contain acidic gases such as hydrogen sulfide (H2S) and carbon dioxide (CO2). These acidic gases can poison the catalysts in downstream ethylene products; therefore, ethylene production plants are equipped with alkaline scrubbing towers to remove these acidic gases beforehand.

[0003] In the alkaline scrubbing tower of an ethylene plant, the product gas comes into contact with the alkaline solution. H2S and CO2 react with the alkaline solution and flow out with it. However, other impurities in the product gas undergo a series of reactions under alkaline conditions. With long-term operation of the plant, scaling and blockage can occur in the alkaline scrubbing tower, severely impacting normal production.

[0004] The substance produced by the alkaline washing tower reaction is a mixture of aldehyde and ketone condensation polymers, diene free radical cross-linked polymers, oil-alkali emulsions, and salt crystals precipitated during the alkaline washing process. This substance is a yellow, semi-solid state, commonly known as "butter." Butter has very poor fluidity and is immiscible with alkali solution. Currently, there is no qualitative analysis of butter; only several theoretical reasons for its formation have been summarized. Details are as follows:

[0005] ① Aldol condensation reaction occurs in aldehydes and ketones under the action of a base.

[0006] 2C2H4+O2→CH3CHO

[0007]

[0008] The reaction produces an enol anion, which, as an electron-rich group, can accept electrophilic reagents or act as a nucleophile.

[0009]

[0010] Enol anions undergo nucleophilic addition with acetaldehyde to generate alkoxy anions.

[0011]

[0012] Alkoxy ions are strong bases that can remove a proton from water to form a β-hydroxy aldehyde.

[0013]

[0014] β-hydroxy aldehydes are unstable and dehydrate upon heating to form unsaturated aldehydes, which then continue to polymerize to form butter.

[0015] ② Free radical reactions induced by trace amounts of oxygen in dienes or other unsaturated hydrocarbons

[0016] (1) RH + O2 → R· + HOO·

[0017] (2) R· + O2 → ROO·

[0018] (3) ROO· + RHvROOH + R·

[0019] (4) ROOH→RO·+OH·

[0020] (5) CH2=CHR+RO·→RO-CH2-CHR· (chain initiation)

[0021] (6) RO-CH2-CHR·+CH2=CHR→RO-CH2-CHR-CH2-CHR· (chain growth)

[0022] (7) RO-CH2-CHR-CH2-CHR·+RO-CH2-CHR-CH2-CHR·→RO-CH2-CHR-CH2-CHR-CHR-CH2-CHR-CH2-RO (Chain termination)

[0023] ③ Other unknown reaction products

[0024] Impurities in the raw materials for ethylene production, additives in the ethylene production process, and materials of system equipment may undergo various chemical reactions during high-temperature and alkaline washing, thereby generating insoluble substances in the alkaline washing solution.

[0025] The grease buildup will accumulate and form scale as the alkali solution circulates, and may even block the distributor, trays and feed lines in the tower, increasing the pressure difference in the alkali washing tower, seriously affecting the alkali washing effect, causing great safety hazards and having a great negative impact on production.

[0026] Current solutions primarily involve using butter inhibitors, combined with optimizing alkaline washing tower operating conditions (including controlling oxygen content within the tower, optimizing the temperature and alkali concentration in the washing section), to reduce butter production. Generally, a traditional ethylene cracking unit with an annual production capacity of 1 million tons can reduce butter production in the alkaline washing tower to (200-400) kg / month using butter inhibitors, typically maintaining normal operation for 6-12 months. However, under abnormal conditions such as improper operation, tower blockage may occur in about half a month.

[0027] Patent document CN105859504A discloses a butter inhibitor for use in the alkaline washing tower of an ethylene plant. Its components, by mass ratio, include: 10–30% α-amino acids; 10–30% hydroxylamine; 2–10% sulfate-based antioxidant solubilizers; and 30–78% deionized water. The butter inhibitor is obtained by thoroughly mixing and dissolving all components.

[0028] However, when encountering grease buildup clogging the equipment, the current solution is to shut down the machine and open the tank to clean the grease buildup in the alkaline washing tower. This not only disrupts normal production but is also a complex process. Existing grease inhibitors cannot completely solve the problem of grease buildup and even tower blockage in the alkaline washing tower. Furthermore, there are currently no products on the market that can clean grease buildup in the alkaline washing tower online without affecting the normal operation of the equipment. Therefore, technological innovation is needed to fill this gap. Summary of the Invention

[0029] To address the problems existing in the prior art, this invention provides an online grease remover. This online grease remover can, without shutting down the ethylene plant, chelate and disperse accumulated grease in the alkaline scrubbing tower through the circulation of alkali solution, resulting in significant descaling effects. This can improve ethylene production efficiency, extend the service life of the alkaline scrubbing tower, and reduce production costs. Furthermore, this online grease remover is biodegradable and will not increase the burden on waste alkali solution treatment.

[0030] An online butter stain remover comprises the following components in weight percentages: alkyl polyglucoside (APG): 8-20 wt%, fatty alcohol polyoxyethylene ether compound: 8-25 wt%, complex chelating agent: 10-15 wt%, methyl lactate: 10-20 wt%, and the balance being deionized water; wherein the complex chelating agent is a mixture of sodium gluconate and glutamic acid.

[0031] The alkyl polysaccharide compound of this invention, when combined with fatty alcohol polyoxyethylene ether compounds and methyl lactate, exhibits a significant synergistic effect, resulting in a markedly enhanced penetration and dispersion effect on butter. This is primarily because the alkyl polysaccharide binds to H2O and H3O through hydrogen bonds. + The combination of these compounds gives the alkyl polyglycoside molecules a certain positive charge. Fatty alcohol polyoxyethylene ether compounds, due to their embedded EO chains and hydrophilic / hydrophobic groups, possess both anionic and nonionic surfactant properties. Alkyl polyglycosides and fatty alcohol polyoxyethylene ether compounds exhibit an electrochemical interaction similar to that between heteroelectrolytic surfactants. Methyl lactate, with its stable chemical properties, plays a role in penetration and cleaning within the system. Synergistically with the alkyl polyglycosides and fatty alcohol polyoxyethylene ether compounds, it significantly enhances the penetration and dispersion effect on butter.

[0032] Furthermore, this invention employs sodium gluconate and glutamic acid as a composite chelating agent. Sodium gluconate exhibits strong complexing ability towards metal ion salts and strong scale inhibition and dispersion capabilities, remaining effective across the entire pH range. Simultaneously, sodium gluconate also possesses excellent corrosion inhibition properties, protecting equipment. Glutamic acid, containing two carboxyl and amino groups, increases the solubility of the online butter stain remover in water. In alkaline washing systems, organic compounds containing both amino and carboxyl groups are effective in inhibiting the formation and deposition of butter. Glutamic acid also exhibits good chelating and dissolving abilities for inorganic salt crystals in butter. The various components in the online butter stain remover formulation of this invention work synergistically, resulting in excellent scale removal performance.

[0033] Preferably, the alkyl polysaccharide (APG) is:

[0034]

[0035] Where R is an alkyl group having 8 to 16 carbon atoms.

[0036] The alkyl polysaccharide (APG) can be prepared by a condensation reaction of carbohydrate compounds and higher alcohols. Alkyl polysaccharides are readily soluble in water, have low surface tension, strong wetting and detergency, are easy to dilute, do not gel, are convenient to use, and exhibit rapid and complete biodegradation.

[0037] Preferably, the fatty alcohol polyoxyethylene ether compound includes at least one of fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sulfate, or fatty alcohol polyoxyethylene ether carboxylate. Fatty alcohol polyoxyethylene ether compounds exhibit good wetting properties and good chemical stability, as well as good penetration and dispersibility.

[0038] The ether bonds in fatty alcohol polyoxyethylene ether molecules are not easily destroyed by acids and alkalis, exhibiting high stability. They possess fixed hydrophilic and lipophilic groups, significantly reducing surface tension and allowing for rapid penetration and wetting. Fatty alcohol polyoxyethylene ether sulfates demonstrate excellent solubility and wetting properties, along with good chemical stability. Fatty alcohol polyoxyethylene ether carboxylates exhibit strong detergency and penetrating dispersibility. Due to the intercalation of polyoxyethylene chains between hydrophobic and hydrophilic groups, modified salts of fatty alcohol polyoxyethylene ethers possess characteristics of both nonionic and anionic surfactants, while also exhibiting good biodegradability.

[0039] Preferably, the fatty alcohol polyoxyethylene ether has an EO number of 6 to 10 and an alkyl carbon number of 8 to 18.

[0040] Preferably, the fatty alcohol polyoxyethylene ether sulfate has an EO number of 2 to 3 and an alkyl carbon number of 12 to 14. The fatty alcohol polyoxyethylene ether sulfate can be sodium fatty alcohol polyoxyethylene ether sulfate, potassium fatty alcohol polyoxyethylene ether sulfate, etc. The fatty alcohol polyoxyethylene ether sulfate can be obtained by sulfation of fatty alcohol polyoxyethylene ether.

[0041] Preferably, the fatty alcohol polyoxyethylene ether carboxylate has an EO number of 4 to 9 and an alkyl carbon atom number of 12 to 14. The fatty alcohol polyoxyethylene ether carboxylate can be sodium fatty alcohol polyoxyethylene ether carboxylate, potassium fatty alcohol polyoxyethylene ether carboxylate, etc. The fatty alcohol polyoxyethylene ether carboxylate can be prepared by reacting an alcohol ether with monochloroacetic acid under alkaline conditions, or by oxidation with a catalyst under alkaline conditions. More preferably, the fatty alcohol polyoxyethylene ether carboxylate has an EO number of 5 and an alkyl carbon atom number of 12 to 14. Studies have shown that the fatty alcohol polyoxyethylene ether carboxylate exhibits the best detergency when the EO number is 5.

[0042] Preferably, the fatty alcohol polyoxyethylene ether compound is a mixture of fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sulfate and fatty alcohol polyoxyethylene ether carboxylate in a mass ratio of 1-5:2-15:3.5-10. Within this range, the fatty alcohol polyoxyethylene ether compound has better performance when compounded with alkyl polysaccharide glycoside and methyl lactate.

[0043] Preferably, the mass ratio of sodium gluconate to glutamic acid in the composite chelating agent is 1-5:2-7.

[0044] Preferably, in the online butter stain remover, the mass ratio of alkyl polysaccharide glycoside, fatty alcohol polyoxyethylene ether compound, and methyl lactate is 4–9:6–10:5–8. This compound ratio results in superior performance of the online butter stain remover.

[0045] This invention also provides a method for preparing the aforementioned online butter stain remover. The preparation method of the online butter stain remover of this invention is simple, environmentally friendly, and uses readily available raw materials, making it suitable for large-scale industrial production.

[0046] A method for preparing an online butter stain remover includes the following steps:

[0047] (1) Dissolve sodium gluconate and glutamic acid monomer in deionized water according to the ratio to obtain solution A;

[0048] (2) Dissolve the fatty alcohol polyoxyethylene ether compound in deionized water according to the ratio to obtain solution B;

[0049] (3) Add alkyl polysaccharide, methyl lactate and solution A to solution B according to the ratio, stir and filter to obtain the online butter stain remover.

[0050] Preferably, in step (1), sodium gluconate and glutamic acid monomer are first mixed in proportion, ground into powder, and then added to deionized water to prepare solution A so that the composite chelating agent is fully dissolved.

[0051] Preferably, in step (2), when preparing the fatty alcohol polyoxyethylene ether compound solution B, the fatty alcohol polyoxyethylene ether compound needs to be added to deionized water and stirred to avoid the formation of a viscous gel.

[0052] Preferably, in step (3), the stirring time is 0.5 to 1 hour.

[0053] This invention also provides the application of the aforementioned online grease remover in removing grease buildup in the alkaline scrubbing tower of an ethylene plant. The online grease remover is continuously injected into the alkaline scrubbing tower along with the alkaline solution for cleaning. The online grease remover of this invention is uniform and stable, capable of rapidly dissolving polymer scale in the alkaline scrubbing tower. Furthermore, in cases of grease buildup, there is no need to shut down the plant or open the tank for cleaning; simply add the online grease remover of this invention along with the alkaline solution into the alkaline scrubbing tower, making the operation extremely simple.

[0054] Preferably, the online grease remover is continuously injected into the alkali washing tower along with the alkali solution injection line. The online grease remover of this invention is easy to use. During trial use or application at the production site, the specific addition point can be determined according to the characteristics and requirements of the system. The addition method can be a plug metering pump to continuously and uniformly add it to the system. For example, depending on the characteristics and requirements of the system, the online grease remover can be continuously and uniformly added to the system using a plug metering pump on the circulating alkali solution lines of the strong alkali, medium alkali, and weak alkali sections of the alkali washing tower in an ethylene plant, according to the system's characteristics and requirements.

[0055] Preferably, the concentration of the online butter stain remover in the alkaline solution is 20-400 ppm.

[0056] More preferably, the concentration of the online butter stain remover in the alkaline solution is 30-200 ppm.

[0057] Preferably, the injection temperature of the online butter stain remover injected into the alkaline washing tower along with the alkaline solution is 40-55°C.

[0058] Compared with the prior art, the present invention has at least the following beneficial effects:

[0059] (1) The online grease stain remover of the present invention is uniform and stable, and can quickly dissolve polymer scale in alkaline washing towers. At the same time, the penetrant in the online grease stain remover of the present invention can quickly enter the interior of organic polymers, increasing the contact area, and can quickly disperse and remove existing grease stains. The functions of each component in the online grease stain remover formulation are synergistically enhanced, and it can also interact with the grease inhibitor added to the system to enhance the grease inhibition effect of the system while removing scale, effectively improving the production efficiency of ethylene plants.

[0060] (2) The online grease remover of the present invention can dissolve and remove grease from the alkaline washing tower when grease clogs the tower, thus eliminating the adverse effects of grease blockage. The raw materials of the online grease remover are non-toxic and non-polluting, and all have good biodegradability, which will not increase the burden on subsequent waste alkali treatment and reduce environmental harm. The online grease remover of the present invention can bring significant economic and social benefits.

[0061] (3) The preparation method of the online butter stain remover of the present invention is simple, environmentally friendly, and the raw materials are readily available, making it suitable for large-scale industrial production.

[0062] (4) The online grease remover of the present invention does not require shutdown and opening of the tank for cleaning when grease accumulates. It can be simply added to the alkaline washing tower along with the alkali solution, making the operation extremely simple. When used in production, the specific addition point and amount can be determined according to the characteristics and requirements of the equipment system. Detailed Implementation

[0063] The online butter stain remover in this embodiment of the invention comprises the following raw material components by weight percentage: alkyl polysaccharide glycoside (APG) 8-20 wt%, fatty alcohol polyoxyethylene ether compound 8-25 wt%, composite chelating agent 10-15 wt%, methyl lactate 10-20 wt%, and the balance being deionized water. The sum of the weight percentages of each component is 100%.

[0064] Example 1

[0065] The mass percentage of each component in the online butter stain remover of this embodiment is as follows: Alkyl polysaccharide APG1214 (alkyl chain carbon number R is C) 12 C 14 The content of mixed-carbon chain alkyl polysaccharides (Nanjing Jinlan Chemical Co., Ltd.) was 10 wt%; the total mass percentage of fatty alcohol polyoxyethylene ether compounds was 15 wt%, of which fatty alcohol polyoxyethylene ether AEO-7 (C 12～14 7EO, Jinan Xinke Chemical Co., Ltd.), sodium fatty alcohol polyoxyethylene ether sulfate AES (C 12～14EO number 2-3, Zanyu Technology Group Co., Ltd.) and sodium fatty alcohol polyoxyethylene ether carboxylate AEC9Na (C 12～14 The mass ratio of the compound chelating agent (9EO, Shanghai Fakai Chemical Co., Ltd.) is 3:10:7; the total mass fraction of the compound chelating agent is 10wt%, of which the mass ratio of sodium gluconate to glutamic acid is 3:2; methyl lactate is 15wt%; and deionized water is 50wt%.

[0066] Weigh each raw material according to the mass percentage of the above components, and prepare the online butter stain remover according to the following preparation method:

[0067] a. Heat the deionized water to 50°C and keep it at a constant temperature in a water bath for later use.

[0068] b. Grind the weighed sodium gluconate and glutamic acid monomer into powder, add them to deionized water and stir to obtain solution A;

[0069] c. Add the weighed fatty alcohol polyoxyethylene ether compound to deionized water and stir until homogeneous to obtain mixture B;

[0070] d. Add the weighed APG1214, methyl lactate, and compound chelating agent solution A to the mixture B in sequence, stir continuously for 1 hour, and filter to obtain the online butter stain remover.

[0071] Example 2

[0072] The mass percentage of each component in the online butter stain remover of this embodiment is as follows: Alkyl polysaccharide APG0810 (alkyl chain carbon number R is C8, C9) 10 The content of mixed-carbon chain alkyl polysaccharides (Nanjing Jinlan Chemical Co., Ltd.) was 15 wt%; the total mass percentage of fatty alcohol polyoxyethylene ether compounds was 17 wt%, of which fatty alcohol polyoxyethylene ether AEO-7 (C 12～14 7EO, Jinan Xinke Chemical Co., Ltd.), sodium fatty alcohol polyoxyethylene ether sulfate AES (C 12～14 EO number 2-3, Zanyu Technology Group Co., Ltd.) and sodium fatty alcohol polyoxyethylene ether carboxylate AEC9Na (C 12～14 The mass ratio of the compound chelating agent (9EO, Shanghai Fakai Chemical Co., Ltd.) is 3:9:9; the mass ratio of sodium gluconate to glutamic acid is 3:2; the mass ratio of sodium gluconate to glutamic acid is 10wt%; and the mass ratio of deionized water is 50wt%.

[0073] The preparation method is the same as in Example 1.

[0074] Example 3

[0075] The mass percentage of each component in the online butter stain remover of this embodiment is as follows: Alkyl polysaccharide APG0814 (alkyl chain carbon number R is C8, C9)10 C 12 C 14 The content of mixed-carbon chain alkyl polysaccharides (Nanjing Jinlan Chemical Co., Ltd.) was 8 wt%; the total mass percentage of fatty alcohol polyoxyethylene ether compounds was 20 wt%, of which sodium fatty alcohol polyoxyethylene ether sulfate (AES) was 20 wt%. 12～14 EO number 2-3, Zanyu Technology Group Co., Ltd.) and sodium fatty alcohol polyoxyethylene ether carboxylate AEC9Na (C 12～14 The composition of the compound chelating agent is 8 wt%, of which the mass ratio of sodium gluconate to glutamic acid is 1:1; methyl lactate is 14 wt%; and deionized water is 50 wt%. (9EO, Shanghai Fakai Chemical Co., Ltd.)

[0076] The preparation method is the same as in Example 1.

[0077] Example 4

[0078] The mass percentage of each component in the online butter stain remover of this embodiment is as follows: Alkyl polysaccharide APG0814 (alkyl chain carbon number R is C8, C9) 10 C 12 C 14 The content of mixed-carbon chain alkyl polysaccharides (Nanjing Jinlan Chemical Co., Ltd.) was 18 wt%; the total mass percentage of fatty alcohol polyoxyethylene ether compounds was 12 wt%, of which sodium fatty alcohol polyoxyethylene ether sulfate (AES) was 18 wt%. 12～14 EO number 2-3, Zanyu Technology Group Co., Ltd.) and sodium fatty alcohol polyoxyethylene ether carboxylate AEC9Na (C 12～14 The composition of the compound chelating agent is 10 wt%, of which the mass ratio of sodium gluconate to glutamic acid is 1:2; methyl lactate is 10 wt%; and deionized water is 50 wt%. (9EO, Shanghai Fakai Chemical Co., Ltd.)

[0079] The preparation method is the same as in Example 1.

[0080] Comparative Example 1

[0081] The mass percentage of each component in the online butter stain remover in this comparative example is as follows: the total mass percentage of fatty alcohol polyoxyethylene ether compounds is 32 wt%, of which fatty alcohol polyoxyethylene ether AEO-7 (C 12～14 7EO, Jinan Xinke Chemical Co., Ltd.), sodium fatty alcohol polyoxyethylene ether sulfate AES (C 12～14 EO number 2-3, Zanyu Technology Group Co., Ltd.) and sodium fatty alcohol polyoxyethylene ether carboxylate AEC9Na (C 12～14The mass ratio of the compound chelating agent (9EO, Shanghai Fakai Chemical Co., Ltd.) is 3:9:9; the mass ratio of sodium gluconate to glutamic acid is 3:2; the mass ratio of sodium gluconate to glutamic acid is 10wt%; and the mass ratio of deionized water is 50wt%.

[0082] Weigh each raw material according to the weight percentage of the above components, and prepare the online butter stain remover according to the following preparation method:

[0083] a. Heat the deionized water to 50°C and keep it at a constant temperature in a water bath for later use.

[0084] b. Grind the weighed sodium gluconate and glutamic acid monomer into powder, add them to deionized water and stir to obtain solution A;

[0085] c. Add the weighed fatty alcohol polyoxyethylene ether compound to deionized water and stir until homogeneous to obtain mixture B;

[0086] d. Add the weighed methyl lactate and compound chelating agent solution A to the mixture B in sequence, and stir continuously for 1 hour. After filtration, the online butter stain remover is obtained.

[0087] Comparative Example 2

[0088] The mass percentage of each component in the online butter stain remover in this comparative example is as follows: Alkyl polysaccharide APG1214 (alkyl chain carbon number R is C) 12 C 14 The content of mixed-carbon chain alkyl polysaccharides (Nanjing Jinlan Chemical Co., Ltd.) was 15 wt%; the total mass percentage of fatty alcohol polyoxyethylene ether compounds was 23 wt%, of which fatty alcohol polyoxyethylene ether AEO-7 (C 12～14 7EO, Jinan Xinke Chemical Co., Ltd.), sodium fatty alcohol polyoxyethylene ether sulfate AES (C 12～14 EO number 2-3, Zanyu Technology Group Co., Ltd.) and sodium fatty alcohol polyoxyethylene ether carboxylate AEC9Na (C 12～14 The mass ratio of sodium gluconate to glutamic acid is 10:10:7 (9EO, Shanghai Fakai Chemical Co., Ltd.); 12wt% of compound chelating agent, of which the mass ratio of sodium gluconate to glutamic acid is 3:2; and 50wt% of deionized water.

[0089] Weigh each raw material according to the weight percentage of the above components, and prepare the online butter stain remover according to the following preparation method:

[0090] a. Heat the deionized water to 50°C and keep it at a constant temperature in a water bath for later use.

[0091] b. Grind the weighed sodium gluconate and glutamic acid monomer into powder, add them to deionized water, and obtain composite chelating agent solution A;

[0092] c. Add the weighed fatty alcohol polyoxyethylene ether compound to deionized water and stir until homogeneous to obtain mixture B;

[0093] d. Add the weighed alkyl polysaccharide and compound chelating agent solution A to the mixture B in sequence, and stir continuously for 1 hour. After filtration, the online butter stain remover is obtained.

[0094] Comparative Example 3

[0095] The mass percentage of each component in the online butter stain remover in this comparative example is as follows: Alkyl polysaccharide APG1214 (alkyl chain carbon number R is C) 12 C 14 The content of mixed-carbon chain alkyl polysaccharides (Nanjing Jinlan Chemical Co., Ltd.) was 10 wt%; the total mass percentage of fatty alcohol polyoxyethylene ether compounds was 15 wt%, of which fatty alcohol polyoxyethylene ether AEO-7 (C 12～14 7EO, Jinan Xinke Chemical Co., Ltd.), sodium fatty alcohol polyoxyethylene ether sulfate AES (C 12～14 EO number 2-3, Zanyu Technology Group Co., Ltd.) and sodium fatty alcohol polyoxyethylene ether carboxylate AEC9Na (C 12～14 The mass ratio of the 9EO (Shanghai Fakai Chemical Co., Ltd.) is 3:10:7; glutamic acid monomer 10wt%; methyl lactate 15wt%; deionized water 50wt%.

[0096] Weigh each raw material according to the weight percentage of the above components, and prepare the online butter stain remover according to the following preparation method:

[0097] a. Heat the deionized water to 50°C and keep it at a constant temperature in a water bath for later use.

[0098] b. Grind the weighed sodium gluconate and glutamic acid monomer into powder, add them to deionized water, and obtain composite chelating agent solution A;

[0099] c. Add the weighed fatty alcohol polyoxyethylene ether compound to deionized water and stir until homogeneous to obtain mixture B;

[0100] d. Add the weighed alkyl polysaccharide and compound chelating agent solution A to the mixture B in sequence, and stir continuously for 1 hour. After filtration, the online butter stain remover is obtained.

[0101] Take seven pieces of solidified grease of similar mass, remove the grease with petroleum ether, immerse them in anhydrous ethanol for 1 minute, then take them out, dry them and weigh them. This mass is the mass of the grease before dissolution. Prepare seven kinds of grease removers according to the formulas in Examples 1 to 4 and Comparative Examples 1 to 3 above.

[0102] A 6% NaOH solution was prepared and heated to 45°C in a constant-temperature water bath. The heated NaOH solution was then placed into stirred tanks. Seven pieces of treated grease were immersed in the NaOH solution in the stirred tanks, and then each was injected with the grease remover from Examples 1-4 and Comparative Examples 1-3 at a concentration of 5%. After stirring at a constant temperature for 72 hours, the pieces were removed, cleaned, and weighed. This weight represents the mass of the remaining etched material after etching. The etching rate test results of the grease remover in the examples and comparative examples are shown in Table 1.

[0103]

[0104] Table 1 shows that the online butter stain remover prepared by the method of this embodiment has a good stain removal effect on butter polymers in the alkaline washing tower. Comparative Example 1 did not add alkyl polysaccharide glycosides, Comparative Example 2 did not add methyl lactate, and Comparative Example 3 only added glutamic acid monomer as a chelating agent, which reduced the dissolution rate of butter stains.

[0105] Table 1. Results of the erosion rate test for the butter stain remover.

[0106]

[0107] Application Example 1

[0108] The online grease stain remover was applied in the alkaline scrubbing tower of a traditional ethylene plant (approximately 800,000 tons per year) at Sinopec Yangzi Petrochemical Co., Ltd. Due to an operational error, the pressure differential in the alkaline scrubbing tower continuously increased from 36 kPa to 98 kPa, and showed a continuing upward trend. Analysis revealed that the abnormality was caused by poor flow in the packing material at the lower section of the alkali zone in the alkaline scrubbing tower.

[0109] The temperature of the alkaline washing tower was set to 45℃, and the NaOH concentration in the strong alkali section was controlled at 7%–8%. The grease inhibitor injected into the alkaline washing tower through the inlet of the medium alkali circulation pump GA203A was replaced with the grease stain remover from Example 2. The concentration of the grease stain remover injected with the alkali solution was 200 ppm, and the total injection volume in multiple injections was 1000 L, with other parameters remaining unchanged.

[0110] Eight hours after the initial addition of 100L of online grease remover, the differential pressure in the alkaline washing tower began to decrease slowly. After adding 600L and 300L of the remover, the differential pressure in the tower decreased to 35kPa after 96 hours. The tower continued to operate for ten days, with the differential pressure in the alkaline washing tower maintained at 30-40kPa. Then, the grease inhibitor was replaced, and the alkaline washing tower returned to normal operation.

[0111] Application Example 2

[0112] The online grease remover was applied in the alkaline scrubbing tower of the S-MTO unit at Zhong'an United Coal Chemical Co., Ltd. Due to the high oxide content in the initial process gas, the alkaline scrubbing tower produced a large amount of grease, leading to a significant upward trend and large fluctuations in the pressure differentials of the strong alkali, medium alkali, and weak alkali sections. Investigation revealed grease blockage in the downcomer and trays of the alkaline scrubbing tower.

[0113] The temperature of the alkaline washing tower was set to 45℃. After confirming the stable operation of the grease inhibitor injection pump, the grease stain remover from Example 1 was injected into the alkaline washing tower along with the alkaline solution. The injection volume was 200 ppm in the weak and strong alkaline sections and 150 ppm in the alkaline section of the alkaline washing tower. Based on the actual operating results, the injection volume of the grease stain remover in the strong, medium, and weak alkaline sections was adjusted in real time, effectively solving the clogging problem in the alkaline washing tower. The circulation rate in the medium and strong alkaline sections increased from 25 t / h to 60 t / h, the pressure difference stabilized at 34 kPa, and the alkaline washing tower operated stably.

[0114] The technical features of the embodiments listed above can be combined arbitrarily. The detailed embodiments are only for specific illustration of the feasibility of the present invention and are not intended to limit the scope of protection of the present invention. Within the scope of this art, all modifications, improvements, and equivalent implementations made without departing from the concept of the present invention should be included within the scope of protection of the present invention.

Claims

1. An online butter stain remover, characterized in that, The product comprises the following components in weight percentages: alkyl polyglycosides: 8-20 wt%, fatty alcohol polyoxyethylene ether compounds: 8-25 wt%, complex chelating agent: 10-15 wt%, methyl lactate: 10-20 wt%, and the balance being deionized water; wherein the complex chelating agent is a mixture of sodium gluconate and glutamic acid; and the alkyl polyglycosides are: Wherein R is an alkyl group having 8 to 16 carbon atoms; the fatty alcohol polyoxyethylene ether compounds include at least one of fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sulfate, or fatty alcohol polyoxyethylene ether carboxylate.

2. The online butter stain remover according to claim 1, characterized in that, The fatty alcohol polyoxyethylene ether has an EO number of 6-10 and an alkyl carbon atom number of 8-18; the fatty alcohol polyoxyethylene ether sulfate has an EO number of 2-3 and an alkyl carbon atom number of 12-14; the fatty alcohol polyoxyethylene ether carboxylate has an EO number of 4-9 and an alkyl carbon atom number of 12-14.

3. The online butter stain remover according to claim 2, characterized in that, The fatty alcohol polyoxyethylene ether compounds are mixtures of fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sulfate and fatty alcohol polyoxyethylene ether carboxylate in a mass ratio of 1~5:2~15:3.5~10.

4. The online butter stain remover according to claim 1, characterized in that, The mass ratio of sodium gluconate to glutamic acid in the composite chelating agent is 1~5:2~7.

5. The online butter stain remover according to claim 1, characterized in that, In the aforementioned online butter stain remover, the mass ratio of alkyl polysaccharide, fatty alcohol polyoxyethylene ether compound to methyl lactate is 4~9:6~10:5~8.

6. The method for preparing the online butter stain remover according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Dissolve sodium gluconate and glutamic acid monomer in deionized water according to the ratio to obtain solution A; (2) Dissolve fatty alcohol polyoxyethylene ether compound in deionized water according to the ratio to obtain solution B; (3) Add alkyl polysaccharide, methyl lactate and solution A to solution B according to the ratio, stir and filter to obtain the online butter stain remover.

7. The application of the online grease remover according to any one of claims 1-5 in removing grease from the alkaline scrubbing tower of an ethylene plant, characterized in that, The online butter stain remover is continuously injected into the alkaline washing tower along with the alkaline solution for cleaning.

8. The application according to claim 7, characterized in that, The concentration of the online butter stain remover in the alkaline solution is 20~400ppm.

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