Environment-friendly water-based cleaning agent for cleaning refining and chemical plants and preparation method thereof

Abstract

The present application relates to the technical fields of water-based cleaning agent, and relates to an environment-friendly water-based cleaning agent for cleaning refining devices and a preparation method thereof.The environment-friendly water-based cleaning agent for cleaning refining devices and the preparation method thereof, the former comprises a main agent, a coupling agent, a first cleaning aid, a second cleaning aid and a dispersing agent, the main agent is one or more than one of isopropyl alcohol amide, the coupling agent is polyoxypropylene glycol, and the dispersing agent is deionized water or distilled water.In the latter, the required amount of the first cleaning aid and the second cleaning aid are added to the dispersing agent under stirring until the solution is clear and transparent to obtain a mixed solution, then the required amount of the main agent is added to the mixed solution and stirred until the solution is clear and transparent to obtain an intermediate solution, and finally the required amount of the coupling agent is added to the intermediate solution and stirred to obtain the environment-friendly water-based cleaning agent for cleaning refining devices.The preparation method is simple, the obtained cleaning agent is safe and environment-friendly, and the cleaning effect is remarkable.

Description

Technical Field

[0001] This invention relates to the field of water-based cleaning agents, specifically an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment and its preparation method. Background Technology

[0002] In industrial production and machinery maintenance, oil removal is a common and important task that cannot be ignored. Water-based oil removers are a hot topic in the development of oil removal technology from the perspectives of energy, environmental protection, and safety. At present, countries around the world are vying to develop water-based oil removers, but the properties of oil stains vary greatly.

[0003] Chinese patent document CN108865491B discloses a highly efficient oil-stripping industrial oil stain cleaner and its preparation method. The cleaner is prepared by mixing 10% to 25% fatty alcohol polyether sulfate, 5% to 10% sodium dodecylbenzenesulfonate, 2% to 5% co-surfactant, 1% to 5% sodium metasilicate, 0% to 5% isopropanol, and water until homogeneous. The main component, fatty alcohol polyether sulfate, is toxic and has poor flowability, making it difficult to obtain. The main component, sodium dodecylbenzenesulfonate, has a very low biodegradability rate and incomplete degradation, causing environmental pollution.

[0004] Chinese patent document CN115386889A discloses a water-based high-efficiency crude oil cleaning agent, comprising 8.0 parts of fatty alkylamine polyoxyethylene ether, 5.0 parts of sodium tripolyphosphate, 4.0 parts of sodium pyrophosphate, 2.0 parts of EDTA-4Na, 1.0 part of fatty alcohol polyoxyethylene ether, 3.0 parts of polysorbate-80, 3.0 parts of diethylene glycol methyl ether, 3.0 parts of organic amine, 2.0 parts of polyoxyethylene phosphate, and the remainder being an appropriate amount of water. This agent utilizes ultrasound to clean crude oil stains under alkaline conditions, achieving thorough removal of stains. It exhibits strong cleaning power, low operating temperature, short action time, and high cleaning efficiency. However, this cleaning agent contains a high content of phosphorus, such as sodium tripolyphosphate and sodium pyrophosphate, making it environmentally unfriendly.

[0005] The aforementioned water-based oil stain cleaners suffer from poor biodegradability and environmental hazards caused by phosphorus-containing wastewater discharge, failing to fully meet the oil stain cleaning needs of oil refining and chemical plants. Therefore, it is essential to invent a water-based oil stain cleaner for refining and chemical plants that is rationally formulated, cost-effective, efficient, safe, and environmentally friendly. Summary of the Invention

[0006] This invention provides an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment and its preparation method, which overcomes the shortcomings of the prior art and can effectively solve the problems of poor biodegradability and phosphorus-containing waste liquid discharge that cause environmental harm to existing refining and chemical equipment cleaning agents.

[0007] One of the technical solutions of the present invention is achieved through the following measures: an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment, wherein the raw materials are, by weight fraction: 18% to 31% of the main agent, 15% to 35% of the coupling agent, 2% to 5% of the first cleaning aid, 0.1% to 0.5% of the second cleaning aid, and 40% to 50% of the dispersant.

[0008] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: The above-mentioned environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment is prepared according to the following steps: The first step is to add the required amounts of the first and second detergent builders to the dispersant and stir until the solution is clear and transparent to obtain a mixed solution. The second step is to add the required amount of the main agent to the mixed solution and stir until the solution is clear and transparent to obtain the intermediate solution; The third step is to add the required amount of coupling agent to the intermediate solution and stir to obtain an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment.

[0009] The main agent mentioned above is one or more of isopropanolamides.

[0010] The first detergent builder is sodium silicate, and the second detergent builder is potassium hydroxide.

[0011] The dispersant mentioned above is deionized water or distilled water.

[0012] In the second step above, the solution preparation temperature is from room temperature to 35°C.

[0013] In the third step above, the stirring time is 30 to 90 minutes.

[0014] The second technical solution of the present invention is achieved through the following measures: a method for preparing an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment, which is carried out according to the following method: The first step is to add the required amounts of the first and second detergent builders to the dispersant and stir until the solution is clear and transparent to obtain a mixed solution. The second step is to add the required amount of the main agent to the mixed solution and stir until the solution is clear and transparent to obtain the intermediate solution; The third step is to add the required amount of coupling agent to the intermediate solution and stir to obtain an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment.

[0015] The following are further optimizations and / or improvements to the second technical solution of the above invention: The main agent is one or more of isopropanolamides; or / and, the coupling agent is polyoxypropylene glycol; or / and, the first detergent is sodium silicate, and the second detergent is potassium hydroxide; or / and, the dispersant is deionized water or distilled water; or / and, in the second step, the solution preparation temperature is room temperature to 35°C; or / and, in the third step, the stirring time is 30 minutes to 90 minutes.

[0016] This invention provides an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment and its preparation method. The cleaning agent uses readily available and simple raw materials, and its formulation is straightforward. The main agents, isopropanolamide and polypropylene glycol (PPG400), are safe and environmentally friendly raw materials. The resulting cleaning agent is non-toxic, odorless, non-volatile, and biodegradable. Therefore, no special personal protective equipment or other safety measures are required during production, use, and storage. Using this cleaning agent effectively cleans refining and chemical equipment, solving the problems of poor biodegradability and phosphorus-containing wastewater pollution associated with existing refining and chemical equipment cleaning agents. Detailed Implementation

[0017] This invention is not limited to the following embodiments, and specific implementation methods can be determined according to the technical solution of this invention and the actual situation. Unless otherwise specified, all chemical reagents and chemical products mentioned in this invention are well-known and commonly used chemical reagents and chemical products in the prior art; unless otherwise specified, all percentages in this invention are mass percentages; room temperature in this invention generally refers to a temperature between 15°C and 25°C, and is generally defined as 25°C.

[0018] The present invention will be further described below with reference to embodiments: Example 1: The environmentally friendly water-based cleaning agent for cleaning the refining and chemical equipment has the following raw materials by weight fraction: 18% to 31% main agent, 15% to 35% coupling agent, 2% to 5% first cleaning aid, 0.1% to 0.5% second cleaning aid, and 40% to 50% dispersant.

[0019] Example 2: As an optimization of the above examples, it was prepared according to the following steps: The first step is to add the required amounts of the first and second detergent builders to the dispersant and stir until the solution is clear and transparent to obtain a mixed solution. The second step is to add the required amount of the main agent to the mixed solution and stir until the solution is clear and transparent to obtain the intermediate solution; The third step is to add the required amount of coupling agent to the intermediate solution and stir to obtain an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment.

[0020] Example 3: As an optimization of the above examples, the main agent is one or more of isopropanolamides.

[0021] Example 4: As an optimization of the above examples, the coupling agent is polypropylene glycol.

[0022] In this invention, the main single agent of the cleaning agent can be one or more of isopropanolamide 6508 or isopropanolamide DF-21. Isopropanolamide possesses excellent detergency, penetrability, oil dispersibility, low water environment damage, and does not generate destructive ions; it is non-irritating, gentle on eyes and skin, and has excellent wetting and penetrability, as well as good foaming power and foam stability, with foaming power unaffected by water hardness and pH value; due to the presence of isomeric bonds in the molecule, it has excellent resistance to hard water and calcium soap dispersibility; it has excellent compatibility and can be compounded with anionic and cationic surfactants or used alone. It can be used in household and industrial cleaning agents, cosmetics, textile auxiliaries, and as an emulsifier, corrosion inhibitor, and thickener in the petroleum industry.

[0023] The coupling agent can be polypropylene glycol (PPG400). Polypropylene glycol, as an important polymer compound, has wide applications in chemistry, medicine, biology, and engineering. Its chemical stability, biocompatibility, low toxicity, and regulatory properties make it an ideal material for many fields. For example, it is used as a drug coating material to improve drug solubility and stability; for the separation and purification of biomolecules; for cell cryopreservation and freeze-thaw protection; for the preparation of polymeric gel materials and artificial aggregates; and as a lubricant and preservative to improve the performance and stability of mechanical and electronic equipment.

[0024] Isopropanolamide and polypropylene glycol are both low-toxicity, harmless, non-flammable, non-explosive, non-volatile, and completely biodegradable substances. The environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment prepared from them also has the characteristics of being non-toxic, odorless, non-volatile, and biodegradable. Therefore, no special personal protective equipment or other safety measures are required during production, use, and storage.

[0025] The environmentally friendly water-based cleaning agent used for cleaning refining and chemical equipment has stable performance. Experiments have shown that its various properties remain unchanged after being stored at room temperature in the dark for 3 years.

[0026] Example 5: As an optimization of the above example, the first detergent builder is sodium silicate and the second detergent builder is potassium hydroxide.

[0027] Example 6: As an optimization of the above examples, the dispersant is deionized water or distilled water.

[0028] As required, during the preparation of environmentally friendly water-based cleaning agents for cleaning refining and chemical equipment, when adding the main agent, coupling agent and cleaning aid in sequence, each component must be stirred until the solution is clear and transparent before adding the next component.

[0029] Example 7: As an optimization of the above example, in the second step, the solution preparation temperature is from room temperature to 35°C.

[0030] Example 8: In the third step, the stirring time is 30 to 90 minutes.

[0031] Example 9: The preparation method of the environmentally friendly water-based cleaning agent for cleaning the refining and chemical unit is as follows: The first step is to add the required amounts of the first and second detergent builders to the dispersant and stir until the solution is clear and transparent to obtain a mixed solution. The second step is to add the required amount of the main agent to the mixed solution and stir until the solution is clear and transparent to obtain the intermediate solution; The third step is to add the required amount of coupling agent to the intermediate solution and stir to obtain an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment.

[0032] Example 10: 500g of environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment was prepared according to the following method: First, weigh 25g of sodium silicate and 0.5g of potassium hydroxide, add them to 234.5g of deionized water, and stir thoroughly in a 2L beaker until the solution is clear and transparent to obtain a mixed solution; The second step is to stir the mixed solution with a thermostatic stirrer at a constant temperature of 30°C and a stirring speed of 300 rpm. Add 120g of isopropanolamide 6508 to the mixed solution and stir thoroughly until the solution is clear and transparent to obtain the intermediate solution. The third step involves adding 120g of polypropylene glycol (PPG400) to the intermediate solution and stirring for 30 minutes to obtain an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment, which is designated as Sample 1.

[0033] Example 11: The difference from Example 10 is that the preparation temperature in the second step is 35°C, and an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment is obtained, which is denoted as Sample 2.

[0034] Example 12: The difference from Example 10 is that the stirring time in the third step is 60 minutes, and an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment is obtained, which is denoted as Sample 3.

[0035] Example 13: The difference from Example 10 is that the stirring time in the third step is 90 minutes, and an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment is obtained, which is recorded as Sample 4.

[0036] Example 14: 144g of isopropanolamide 6508, 96g of polypropylene glycol PPG400, 25g of sodium silicate, 0.5g of potassium hydroxide, and 234.5g of deionized water were placed in a 2L beaker. The stirring time in the third step was 60 minutes. According to the preparation method of Example 10, an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment was obtained and designated as Sample 5.

[0037] Example 15: 160g of isopropanolamide 6508, 80g of polypropylene glycol PPG400, 25g of sodium silicate, 0.5g of potassium hydroxide, and 234.5g of deionized water were placed in a 2L beaker. The stirring time in the third step was 60 minutes. According to the preparation method of Example 10, an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment was obtained and designated as Sample 6.

[0038] Example 16: 192g of isopropanolamide 6508, 48g of polypropylene glycol PPG400, 25g of sodium silicate, 0.5g of potassium hydroxide, and 234.5g of deionized water were placed in a 2L beaker. The stirring time in the third step was 60 minutes. According to the preparation method of Example 10, an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment was obtained and designated as Sample 7.

[0039] Example 17: 120g of isopropanolamide DF-21, 120g of polypropylene glycol PPG400, 25g of sodium silicate, 0.5g of potassium hydroxide, and 234.5g of deionized water were placed in a 2L beaker. The stirring time in the third step was 60 minutes. According to the preparation method of Example 10, an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment was obtained and designated as Sample 8.

[0040] Example 18: 144g of isopropanolamide DF-21, 96g of polypropylene glycol PPG400, 25g of sodium silicate, 0.5g of potassium hydroxide, and 234.5g of deionized water were placed in a 2L beaker. The stirring time in the third step was 60 minutes. According to the preparation method of Example 10, an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment was obtained and designated as sample 9.

[0041] Example 19: 160g of isopropanolamide DF-21, 80g of polypropylene glycol PPG400, 25g of sodium silicate, 0.5g of potassium hydroxide, and 234.5g of deionized water were placed in a 2L beaker. The stirring time in the third step was 60 minutes. According to the preparation method of Example 10, an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment was obtained and was designated as Sample 10.

[0042] Example 20: 80g of isopropanolamide 6508, 80g of isopropanolamide DF-21, 80g of polypropylene glycol PPG400, 25g of sodium silicate, 0.5g of potassium hydroxide, and 234.5g of deionized water were placed in a 2L beaker. The stirring time in the third step was 60 minutes. According to the preparation method of Example 10, an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment was obtained and designated as Sample 11.

[0043] Weigh 15g of each of the environmentally friendly water-based cleaning agents for cleaning refining and chemical equipment prepared in Examples 10 to 20, and prepare 500mL of 5% cleaning solution respectively. Following the methods in industry standard JB / T 4323-2019 "Water-based Metal Cleaning Agents", conduct corrosion performance, high and low temperature stability, and cleaning ability tests on the environmentally friendly water-based cleaning agents for cleaning refining and chemical equipment prepared in Examples 10 to 20. Specific test results are as follows: (1) Corrosion performance test Corrosion tests were conducted on three metal specimens: 45 steel, 2Al2 hard aluminum, and H62 brass, according to the method specified in JB / T4323-2019 5.7. The appearance of the test solution was judged as grade 0, and the mass change of the specimen before and after the test was 0 mg, which met the standard requirements.

[0044] (2) High and low temperature stability test The test was conducted according to the method specified in JB / T4323-2019 5.11. The test results were as follows: the test solution was uniform, did not separate into layers, and had no precipitates or flocculent matter, thus it was deemed qualified.

[0045] (3) Cleaning ability test According to the cleaning method specified in the industry standard JB / T 4323-2019 "Water-based Metal Cleaning Agents", standard test pieces were coated with HL46 hydraulic oil and crude oil sludge respectively, and cleaning and oil removal experiments were carried out. The oil washing rate was calculated by the change in weight of the standard test pieces. The experimental results are shown in Table 1. As can be seen from Table 1, the environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment prepared according to the present invention has a cleaning rate of over 90% for both HL46 hydraulic oil and crude oil sludge, which meets the requirement of ≥90% oil washing rate in JB / T 4323-2019 "Water-based Metal Cleaning Agents", and also meets the requirements for oil sludge cleaning in refining and chemical equipment.

[0046] In summary, this invention provides an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment and its preparation method. The cleaning agent uses simple and readily available raw materials, is safe and environmentally friendly, and has a simple preparation process. The prepared cleaning agent has strong cleaning ability, high oil removal rate, and is safe and environmentally friendly. Using this cleaning agent to clean refining and chemical equipment has a good effect, low operating temperature, short action time, and high cleaning efficiency.

[0047] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. An environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment, characterized in that... The raw materials, by weight fraction, are: 18% to 31% main agent, 15% to 35% coupling agent, 2% to 5% first detergent builder, 0.1% to 0.5% second detergent builder, and 40% to 50% dispersant.

2. The environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment according to claim 1, characterized in that... It is prepared according to the following steps: The first step is to add the required amounts of the first and second detergent builders to the dispersant and stir until the solution is clear and transparent to obtain a mixed solution. The second step is to add the required amount of the main agent to the mixed solution and stir until the solution is clear and transparent to obtain the intermediate solution; The third step is to add the required amount of coupling agent to the intermediate solution and stir to obtain an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment.

3. The environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment according to claim 2, characterized in that... The main agent is one or more of isopropanolamides.

4. The environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment according to claim 2 or 3, characterized in that... The coupling agent is polypropylene glycol.

5. The environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment according to claim 2, 3, or 4, characterized in that... The first detergent builder is sodium silicate, and the second detergent builder is potassium hydroxide.

6. The environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment according to claim 2, 3, 4, or 5, characterized in that... The dispersant is deionized water or distilled water.

7. The environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment according to claim 2, 3, 4, 5, or 6, characterized in that... In the second step, the solution preparation temperature is from room temperature to 35°C.

8. The environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment according to claim 2, 3, 4, 5, 6, or 7, characterized in that... In the third step, the stirring time is 30 to 90 minutes.

9. A method for preparing an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment according to claims 1 to 8, characterized in that... Perform the following steps: The first step is to add the required amounts of the first and second detergent builders to the dispersant and stir until the solution is clear and transparent to obtain a mixed solution. The second step is to add the required amount of the main agent to the mixed solution and stir until the solution is clear and transparent to obtain the intermediate solution; The third step is to add the required amount of coupling agent to the intermediate solution and stir to obtain an environmentally friendly water-based cleaning agent for cleaning refining and chemical equipment.

10. The preparation method according to claim 9, characterized in that... The main agent is one or more of isopropanolamides; and / or the coupling agent is polypropylene glycol; and / or the first detergent builder is sodium silicate, and the second detergent builder is potassium hydroxide; and / or the dispersant is deionized water or distilled water; and / or in the second step, the solution preparation temperature is room temperature to 35°C; and / or in the third step, the stirring time is 30 minutes to 90 minutes.

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