Deodorizing and passivating double-effect cleaning agent as well as preparation method and application thereof

Abstract

The invention relates to the technical field of chemical cleaning of industrial equipment, in particular to a deodorizing and passivating double-effect cleaning agent as well as a preparation method and application thereof. The cleaning agent specifically comprises the following components in percentage by weight: 0.2-1.5% of sodium carbonate; 0.1 to 1% of EDTA-2Na (Ethylene Diamine Tetraacetic 2 to 6% of PMPS; 0.5-2% of sodium perborate; 0.1-1% of tannic acid; 0.08 to 0.2 percent of calcium lignosulphonate; 0.1 to 0.3 percent of succinic acid dihydrazide; and the balance of water. The deodorizing and passivating double-effect cleaning agent does not contain heavy metal with the atomic weight larger than 40, the chemical oxygen demand is not larger than 2000 mg / L, good deodorizing and passivating effects are achieved, sulfur-containing substances in industrial equipment can be effectively removed, meanwhile, a good passivating effect on ferrous sulfide is achieved, and the problems of peculiar smell and spontaneous combustion during equipment maintenance are solved.

Description

Technical Field

[0001] This application relates to the technical field of chemical cleaning of industrial equipment, and in particular to a deodorizing and passivating dual-effect cleaning agent, its preparation method and application. Background Technology

[0002] In industries such as petrochemicals and natural gas processing, sulfur-containing compounds are easily generated during equipment operation. These substances not only release unpleasant odors but also react with metal substrates to form ferrous sulfide deposits. This is particularly pronounced in oil refining units that process high-sulfur crude oil (such as atmospheric and vacuum distillation towers, catalytic cracking reactors, hydrorefining units and their associated pipelines and heat exchangers), where complex fouling centered on ferrous sulfide is more prominent. This fouling primarily originates from the chemical reaction between sulfur compounds in crude oil and metals, as well as sulfide deposition during processing. When units are shut down for maintenance, ferrous sulfide exposed to air is highly flammable, releasing heat and sparks that can cause safety accidents. Simultaneously, hydrogen sulfide, small-molecule thiols, and other malodorous gases pollute the environment and endanger the health of maintenance personnel. Therefore, efficiently removing sulfur-containing odors and passivating ferrous sulfide has become a key issue in industrial equipment cleaning. Before shutting down oil refining units, specialized cleaning agents are needed to stabilize ferrous sulfide and efficiently remove malodorous gases.

[0003] Currently, the industry mainly addresses this issue through physical cleaning, chemical cleaning, or a combination of both. However, the results are unsatisfactory and pose safety hazards, making it difficult to simultaneously solve both odor and spontaneous combustion problems. Physical cleaning, in particular, cannot remove deep-seated and creviced dirt, and its deodorization is limited. Simple chemical cleaning requires the use of deodorizing agents and passivating agents in stages, making the process cumbersome and susceptible to the influence of agent compatibility.

[0004] Based on the above, deodorizing and passivating cleaning agents for oil refining units have become a research hotspot. Existing products are mainly divided into three categories: chlorine-phosphorus composite systems, with low-alkalinity sodium hypochlorite and tetramethylphosphoric acid as the core, can oxidize, deodorize, and passivate, but the chlorine-containing components easily cause stress corrosion cracking of austenitic stainless steel, and the phosphorus-containing components increase the pressure of waste liquid treatment; inorganic oxidation systems use sodium pyrosulfate, hypochlorite, etc., combined with trisodium phosphate to adjust stability. Although the cost is low, the treatment of ferrous sulfide encapsulating oil sludge is poor, requiring additional oil-based pretreatment; environmentally friendly composite types use propylene diene diamine, ethylenediaminetetraacetic acid, etc. to replace phosphorus and chlorine-containing components, improving environmental friendliness, but the oxidant activity is short, and it is difficult to achieve both deodorization and passivation efficiency. Some products have a mercaptan removal rate of less than 85%, and the corrosion inhibition of carbon steel needs to be optimized.

[0005] In addition, existing cleaning agents still have shortcomings in practical applications: First, they have narrow compatibility, with most only suitable for normal temperature and pressure conditions. They are prone to decomposition and failure when facing equipment with residual temperatures of 80-120℃. Second, the reaction is not controllable, and the dosage depends on experience estimation. Affected by equipment operating cycles and fluctuations in crude oil sulfur content, there are often problems such as insufficient dosage leading to substandard cleaning or excessive dosage increasing costs. Third, waste liquid treatment is difficult, and phosphorus removal and nitrogen reduction processes are complex, increasing the environmental protection operation costs of enterprises.

[0006] In summary, current deodorizing and passivating cleaning agents used in oil refining units suffer from problems such as difficulty in balancing environmental friendliness and efficiency, narrow range of operating conditions, and high application costs. Developing dual-effect cleaning agents that combine excellent deodorizing and passivating effects, good environmental compatibility, and wide operating condition adaptability has become a technical requirement that the petroleum refining industry urgently needs to address. Summary of the Invention

[0007] This application provides a dual-effect deodorizing and passivating cleaning agent, its preparation method, and its application. The dual-effect deodorizing and passivating cleaning agent provided in this application does not contain heavy metals with an atomic weight greater than 40, and its chemical oxygen demand is no greater than 2000 mg / L. It has excellent deodorizing and passivating effects, effectively removing sulfur-containing substances from industrial equipment, and also has a good passivating effect on ferrous sulfide, solving the problems of odor and spontaneous combustion during equipment maintenance.

[0008] In the first aspect, this application provides a deodorizing and passivating dual-effect cleaning agent, which adopts the following technical solution: A dual-effect deodorizing and passivating cleaning agent, wherein the cleaning agent specifically comprises the following components by weight percentage: sodium carbonate 0.2-1.5%; EDTA-2Na 0.1-1%; PMPS 2-6%; sodium perborate 0.5-2%; tannic acid 0.1-1%; calcium lignosulfonate 0.08-0.2%; dihydrazide succinate 0.1-0.3%; the balance being water.

[0009] In this application, all components in the cleaning agent are uniformly dissolved to form a homogeneous liquid. Sodium carbonate serves as a pH adjuster, water as a solvent, EDTA-2Na as a metal ion chelating agent, PMPS as the core component for oxidation and deodorization, sodium perborate as an auxiliary oxidation and passivation agent, and tannic acid as a complexing agent.

[0010] In the above formulation, PMPS and sodium perborate synergistically release active oxygen to decompose odor molecules; tannic acid complexes with the metal surface to form a protective film; EDTA-2Na chelates free metal ions to prevent deposition; and sodium carbonate provides a pH buffer system to enhance solution stability.

[0011] The molecular structure of calcium lignin sulfonate is sulfonated lignin (a natural polymer containing sulfonic acid groups, phenolic hydroxyl groups, and methoxy groups), in which the activity of the phenolic hydroxyl groups is significantly reduced after sulfonation modification; and it reacts with Fe 2+ / Fe 3+ Cu 2+When metal ions form water-soluble complexes (without precipitation), and the complexing ability is mild, it does not compete with EDTA-2Na for metal ions. Instead, it helps disperse the chelated products of EDTA-2Na, avoiding uneven film formation caused by excessively high local concentrations. The large molecular chains of calcium lignosulfonate (molecular weight 5000-50000) contain a large number of sulfonic acid groups (-SO3Na) and phenolic hydroxyl groups (-OH). The sulfonic acid groups provide hydrophilicity, ensuring uniform molecular dispersion in the system. The phenolic hydroxyl groups react with Fe... 3+ A weak complex is formed, and the macromolecular chains intertwine to form a "network adsorption film" on the metal surface, filling the pores of the chelate film formed by EDTA-2Na and tannic acid, thereby improving the film density and adhesion. The steric hindrance effect of the macromolecular chains can prevent the agglomeration of oxidation products (such as ferric sulfate) and sludge particles, avoiding secondary deposition on the metal surface and ensuring that the cleaning solution always remains homogeneous.

[0012] Succinic dihydrazide contains two hydrazide groups (-CO-NH-NH2). The -NH2 of the hydrazide group can undergo a condensation reaction with thiols (RSH) to produce thiohydrazide, directly removing malodorous substances. Combined with the oxidation of PMPS, it forms a dual deodorization process of "chemical adsorption + oxidative decomposition"; the hydrazide group reacts with Fe... 2+ / Fe 3+ A coordination reaction occurs (forming a five-membered ring chelate), which complements the tannic acid in the basic formulation, enhancing the adhesion between the passivation film and the metal substrate. At the same time, succinic dihydrazide itself has a small molecular weight (150), is easily biodegradable (BOD5 / COD≈0.75), and has a low COD contribution.

[0013] The deodorizing and passivating dual-effect cleaning agent provided in this application does not contain heavy metals with an atomic weight greater than 40 and has a chemical oxygen demand of no more than 2000 mg / L. It has good deodorizing and passivating effects, can effectively remove sulfur-containing substances in industrial equipment, and has a good passivating effect on ferrous sulfide, solving the problems of odor and spontaneous combustion during equipment maintenance.

[0014] Optionally, the amount of calcium lignosulfonate added is 0.12-0.16%.

[0015] In one specific embodiment, the calcium lignosulfonate has a weight percentage of 0.08%, 0.12%, 0.14%, 0.16%, and 0.2%.

[0016] In some specific embodiments, the calcium lignosulfonate has a weight percentage of 0.08-0.12%, 0.08-0.14%, 0.08-0.16%, 0.12-0.14%, 0.12-0.16%, 0.12-0.2%, 0.14-0.16%, 0.14-0.2%, or 0.16-0.2%.

[0017] Optionally, the amount of succinate dihydrazide added is 0.15-0.25%.

[0018] In one specific embodiment, the weight percentage of the succinate dihydrazide is 0.1%, 0.15%, 0.2%, 0.25%, or 0.3%.

[0019] In some specific embodiments, the weight percentage of the succinate dihydrazide is 0.1-0.15%, 0.1-0.2%, 0.1-0.25%, 0.15-0.20%, 0.15-0.25%, 0.15-0.3%, 0.2-0.25%, 0.2-0.3%, or 0.25-0.3%.

[0020] Optionally, the cleaning agent further includes 5-hydroxymethylfurfural, wherein the amount of 5-hydroxymethylfurfural added is 0.1-0.3%.

[0021] Optionally, the amount of 5-hydroxymethylfurfural added is 0.12-0.2%.

[0022] In one specific embodiment, the weight percentage of 5-hydroxymethylfurfural is 0.1%, 0.12%, 0.16%, 0.2%, or 0.3%.

[0023] In some specific embodiments, the weight percentage of 5-hydroxymethylfurfural is 0.1-0.12%, 0.1-0.16%, 0.1-0.2%, 0.12-0.16%, 0.12-0.2%, 0.12-0.3%, 0.16-0.2%, 0.16-0.3%, or 0.2-0.3%.

[0024] 5-Hydroxymethylfurfural (HMF) molecules contain an aldehyde group (-CHO) and a hydroxymethyl group (-CH2OH), with the dual functional groups working synergistically. The aldehyde group has weak oxidizing properties and can undergo addition reactions with hydrogen sulfide and thiols (to form thioacetals), assisting PMPS / sodium perborate in oxidative deodorization and improving the overall deodorization rate. The hydroxymethyl group forms a hydrogen bond network with the carboxyl group of EDTA-2Na and the phenolic hydroxyl group of tannic acid, promoting the uniform deposition of the passivation film on the metal surface. At the same time, its own molecular chains can fill the pores of the film layer, improving its density. Furthermore, HMF is heat-resistant (160℃), stable in 10% NaCl solutions at pH 3-10, and does not undergo ineffective decomposition with oxidants (excellent oxidative stability).

[0025] Secondly, this application provides a method for preparing a deodorizing and passivating dual-effect cleaning agent, using the following technical solution: A method for preparing a deodorizing and passivating dual-effect cleaning agent is as follows: Sodium carbonate and EDTA-2Na are added to water according to the required component ratio and stirred until completely dissolved; succinic dihydrazide is then added and stirred until completely dissolved; PMPS and sodium perborate are added sequentially and stirred at 40°C until completely dissolved; calcium lignosulfonate is added and stirred until completely dissolved; finally, tannic acid is added and stirred until completely dissolved to obtain the cleaning agent.

[0026] Optionally, the cleaning agent further includes 5-hydroxymethylfurfural, wherein the amount of 5-hydroxymethylfurfural added is 0.1-0.3%; and the 5-hydroxymethylfurfural is added simultaneously with calcium lignosulfonate.

[0027] Thirdly, this application provides a dual-effect deodorizing and passivating cleaning agent for use in the petrochemical and refining industries for deodorization and reducing safety accidents caused by ferrous sulfide.

[0028] In summary, this application includes at least one of the following beneficial technical effects: The deodorizing and passivating dual-effect cleaning agent provided in this application contains no heavy metals, complies with environmental regulations, and has a passivation effect superior to organic acid products.

[0029] The deodorizing and passivating dual-effect cleaning agent provided in this application has a deodorization rate of ≥90% while the passivation film has a salt spray resistance time of ≥72h; the COD is controlled below 2000mg / L, which is far lower than that of conventional oxidizing cleaning agents in the industry (usually ≥5000mg / L), and has good deodorizing and passivation effects.

[0030] The deodorizing and passivating dual-effect cleaning agent provided in this application can effectively remove sulfur-containing substances from industrial equipment, and at the same time has a good passivation effect on ferrous sulfide, solving the problems of odor and spontaneous combustion during equipment maintenance. Detailed Implementation

[0031] Before describing the embodiments of this application in detail, it should be understood that the terminology used herein is for the purpose of describing a particular embodiment only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the term pertains.

[0032] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0033] The endpoints and any values ​​of the ranges disclosed in this application are not limited to the precise ranges or values, and such ranges or values ​​should be understood to include values ​​close to such ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0034] In this application, the terms "comprising" or "including" are open-ended expressions, meaning they include the content specified in this application but do not exclude other aspects.

[0035] This application provides a dual-effect cleaning agent for deodorization and passivation. The cleaning agent specifically comprises the following components by weight percentage: sodium carbonate 0.2-1.5%; EDTA-2Na 0.1-1%; PMPS 2-6%; sodium perborate 0.5-2%; tannic acid 0.1-1%; calcium lignosulfonate 0.08-0.2%; dihydrazide succinate 0.1-0.3%; the balance being water.

[0036] Furthermore, the cleaning agent also includes 5-hydroxymethylfurfural, and the amount of 5-hydroxymethylfurfural added is 0.1-0.3%.

[0037] This application also provides a method for preparing a deodorizing and passivating dual-effect cleaning agent. The preparation method specifically includes the following steps: (1) Add sodium carbonate and EDTA-2Na to water according to the required component ratio, and stir at 120-180 rpm for 3-4 minutes until completely dissolved; (2) Continue to add succinate dihydrazide and stir at 80-120 rpm for 4-5 minutes until completely dissolved; (3) Then add PMPS and sodium perborate in sequence, and stir at 40°C and 150-200 rpm until completely dissolved for 15-25 minutes; (4) Add calcium lignosulfonate and continue stirring at 200-250 rpm for 5-10 minutes until completely dissolved; (5) Finally, add tannic acid and continue stirring at 80-120 rpm for 5-15 minutes until completely dissolved to obtain the cleaning agent.

[0038] Furthermore, the cleaning agent also includes 5-hydroxymethylfurfural, which is added simultaneously with calcium lignosulfonate.

[0039] This application also provides the application of the above-mentioned deodorizing and passivating dual-effect cleaning agent in the petrochemical and refining industries for deodorization and to reduce safety accidents caused by ferrous sulfide.

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0041] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0042] In the following examples, 5-hydroxymethylfurfural (5-HMF) CAS No. 67-47-0 was purchased from Shandong Longli Biotechnology Co., Ltd., with a purity of 98%; succinic dihydrazide CAS No. 110-15-6 was purchased from Shanghai Saiou Biotechnology Co., Ltd., with a solid content of 30-40%; and calcium lignosulfonate CAS No. 8061-52-7 was purchased from Shanghai Xianding Biotechnology Co., Ltd. (Jiuding Chemical), with a purity of 96%.

[0043] The present application will be further described in detail below with reference to the embodiments and test results.

[0044] Example 1

[0045] This embodiment provides a dual-effect cleaning agent for deodorization and passivation.

[0046] The preparation method of the above-mentioned deodorizing and passivating dual-effect cleaning agent is as follows: (1) Add sodium carbonate and EDTA-2Na to water according to the required component ratio, and stir at 160 rpm for 6 minutes until completely dissolved; (2) Continue to add succinate dihydrazide and stir at 100 rpm for 6 minutes until completely dissolved; (3) Then add PMPS and sodium perborate in sequence, and stir at 40°C and 180 rpm until completely dissolved for 20 minutes; (4) Add calcium lignosulfonate and continue stirring at 210 rpm for 6 minutes until completely dissolved; (5) Finally, add tannic acid and stir at 100 rpm for 10 minutes until completely dissolved to obtain the cleaning agent.

[0047] The above-mentioned deodorizing and passivating dual-effect cleaning agent specifically includes the following components by weight percentage: sodium carbonate 0.8%; EDTA-2Na 0.5%; PMPS 6%; sodium perborate 1.2%; tannic acid 0.3%; calcium lignosulfonate 0.08%; dihydrazide succinate 0.2%; and the balance is water.

[0048] Table 1 shows the addition amounts of some components in each embodiment and comparative example.

[0049] Examples 2-5 Examples 2-5 provide a dual-effect cleaning agent for deodorization and passivation. The difference between these examples and Example 1 lies in the amount of calcium lignosulfonate added, as shown in Table 1. All other operating steps remain the same as in Example 1.

[0050] Examples 6-9 Examples 6-9 provide a dual-effect cleaning agent for deodorization and passivation. The difference between these examples and Example 3 lies in the amount of succinic dihydrazide added, as shown in Table 1. All other operating steps remain the same as in Example 3.

[0051] Example 10

[0052] This embodiment provides a dual-effect deodorizing and passivating cleaning agent. The difference between this embodiment and Embodiment 3 is that 5-hydroxymethylfurfural is added during the preparation of the deodorizing and passivating dual-effect cleaning agent; the specific amount added is shown in Table 1. The 5-hydroxymethylfurfural is added simultaneously with calcium lignosulfonate. All other operating steps are consistent with Embodiment 3.

[0053] Examples 11-14 Examples 11-14 provide a dual-effect cleaning agent for deodorization and passivation. The difference between these examples and Example 10 lies in the amount of 5-hydroxymethylfurfural added, as shown in Table 1. All other operating steps remain the same as in Example 10.

[0054] Comparative Example 1 This comparative example provides a dual-effect cleaning agent for deodorization and passivation. The difference between this comparative example and Example 1 is that calcium lignosulfonate and dihydrazide succinate were not added, as detailed in Table 1. All other operating steps remain consistent with Example 1.

[0055] Comparative Example 2 This comparative example provides a dual-effect cleaning agent for deodorization and passivation. The difference between this comparative example and Example 1 is that calcium lignosulfonate was not added, as detailed in Table 1. All other operating steps remain the same as in Example 1.

[0056] Comparative Example 3 This comparative example provides a dual-effect cleaning agent for deodorization and passivation. The difference between this comparative example and Example 1 is that succinic dihydrazide was not added, as detailed in Table 1. All other operating steps remain the same as in Example 1.

[0057] Performance testing The deodorizing and passivating dual-effect cleaning agents provided in the above embodiments and comparative examples were tested.

[0058] (a) Deodorization rate test (room temperature) Gas chromatography (GC) was used to simulate a sulfur-containing odorous system (a mixed gas containing 500 ppm hydrogen sulfide and 200 ppm methanethiol) in an oil refining unit. 100 mL of cleaning agent was placed in a 5 L closed reactor, and the mixed gas was introduced for 30 min. The concentration of residual gas was then measured by GC (FPD detector), and the removal rate was calculated.

[0059] The deodorization rate is calculated as follows: Deodorization rate (%) = (initial concentration - residual concentration) / initial concentration × 100%.

[0060] The test results are shown in Table 2.

[0061] (II) Passivation rate test (room temperature) The passivation rate was calculated by using the electrochemical polarization curve method, with Q235 carbon steel as the working electrode, after soaking in the cleaning agent for 2 hours, and measuring the corrosion current density (Icorr) using an electrochemical workstation. The Icorr of the electrode was compared with that of the untreated electrode.

[0062] The passivation rate is calculated as follows: Passivation rate (%) = (Untreated Icorr - Treated Icorr) / Untreated Icorr × 100%.

[0063] The test results are shown in Table 2.

[0064] (III) Passivation film integrity testing The integrity of the passivation film was tested using the red dot method and the blue dot method (25±2℃).

[0065] (1) Blue dot method Detection principle: When the passivation film is intact, the metal substrate (Fe) does not come into contact with the detection liquid; if the film has pores / damage, Fe will react with ferrocyanide in the detection liquid to form a blue precipitate (Prussian blue), indicating the location of the defect.

[0066] Preparation of test solution: Weigh 10g potassium ferricyanide (K3[Fe(CN)6]) and 10mL nitric acid (65%), dilute with water to 100mL, and mix well (prepare immediately before use).

[0067] The testing method is as follows: ① Wipe the surface of the Q304 stainless steel test piece (100mm×50mm×2mm, dried for 24 hours after cleaning) with anhydrous ethanol to remove oil; ② Apply the test solution evenly to the surface of the test piece with a dropper (coverage area ≥50cm²), and start timing at the same time; ③ Observe whether blue spots appear on the surface of the test piece within 30 seconds, and record the time when the first blue spot appears and the number of blue spots within 30 seconds.

[0068] Judgment criteria: Excellent: No blue dots within 30 seconds, passivation film has no defects; Good: 1-3 blue dots appear within 10-30 seconds, film has slight defects; Medium: 4-10 blue dots appear within 10 seconds, film has moderate defects; Poor: >10 blue dots appear within 10 seconds, film has severe defects.

[0069] (2) Red dot method Detection principle: In acidic solutions, if the passivation film is damaged, the exposed Fe will be corroded, producing Fe2+. 2+ It reacts with an indicator (o-phenanthroline) to form a red complex, indicating defects.

[0070] Preparation of test solution: Weigh 0.5g of o-phenanthroline and 10mL of hydrochloric acid (37%), dilute with water to 100mL, and mix well.

[0071] The testing method is as follows: ① The test piece is pretreated in the same way as the blue dot method, and the test piece is a Q235 carbon steel test piece; ② After applying the test solution, time is set and observe whether red spots appear within 30 seconds, and record the number of red spots and the time of appearance.

[0072] Judgment criteria: consistent with the blue dot method (the number of red spots corresponds to the degree of defect).

[0073] The test results are shown in Table 2.

[0074] (iv) Salt spray resistance time test of passivation film According to GB / T 10125-2021 "Artificial Atmosphere Corrosion Test - Salt Spray Test", Q235 carbon steel test pieces (size 100mm×50mm×2mm) treated with cleaning agent were placed in a neutral salt spray chamber (5% NaCl solution, pH 6.5-7.2, 35℃), and the time when the first rust spot appeared was recorded (≥5% area rust is considered failure).

[0075] The test results are shown in Table 2.

[0076] (v) Deodorization rate and passivation rate testing under extreme environments To simulate extreme working conditions (80℃ high temperature + 5% NaCl high salt system), in the above basic detection method, the reaction temperature was raised to 80℃, 5% NaCl was added to the cleaning solution, and other conditions remained unchanged. The deodorization rate and passivation rate under extreme conditions were measured.

[0077] The test results are shown in Table 2.

[0078] Table 2 Test Results

[0079] As shown in Table 2, compared with the comparative example, the deodorizing and passivating dual-effect cleaning agent prepared by the method of simultaneously adding calcium lignosulfonate and dihydrazide succinate in this application has better deodorization and passivation rates, with a deodorization rate ≥90%, a passivation rate ≥85%, and a passivation film salt spray resistance time ≥80h, which can solve the problems of odor and spontaneous combustion during equipment maintenance. In addition, the deodorizing and passivating dual-effect cleaning agent provided by this application can completely seal residual pores and achieve a complete membrane layer with "no blue / red spots".

[0080] Based on the scheme of adding "calcium lignosulfonate and dihydrazide succinate" at the same time, the scheme was further optimized by adding 5-hydroxymethylfurfural, which can further improve the deodorization and passivation rates of the dual-effect deodorizing and passivating cleaning agent under extreme high temperature and high salt environments.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A deodorizing and passivating two-in-one cleaner characterized by, The cleaning agent specifically comprises the following components by weight percentage: sodium carbonate 0.2-1.5%; EDTA-2Na 0.1-1%; PMPS 2-6%; sodium perborate 0.5-2%; tannic acid 0.1-1%; calcium lignosulfonate 0.08-0.2%; succinic acid dihydrazide 0.1-0.3%; and the balance is water.

2. The cleaning agent according to claim 1, characterized in that, The added amount of the calcium lignosulfonate is 0.12-0.16%.

3. The cleaning agent according to claim 1, characterized in that, The added amount of the succinic acid dihydrazide is 0.15-0.25%.

4. The cleaning agent according to claim 1, characterized by The cleaning agent further comprises 5-hydroxymethylfurfural, and the added amount of the 5-hydroxymethylfurfural is 0.1-0.3%.

5. The cleaning agent according to claim 1, characterized in that, The added amount of the 5-hydroxymethylfurfural is 0.12-0.2%.

6. A method of producing the cleaning agent according to any one of claims 1 to 3, characterized by, The preparation method specifically comprises the following steps: according to the required component ratio, sodium carbonate and EDTA-2Na are added into water, and stirred until completely dissolved; succinic acid dihydrazide is continuously added, and stirred until completely dissolved; then PMPS and sodium perborate are sequentially added, and stirred at 40°C until completely dissolved; calcium lignosulfonate is added, and continuously stirred until completely dissolved; finally, tannic acid is added, and continuously stirred until completely dissolved, to obtain the cleaning agent.

7. The preparation method according to claim 6, characterized in that, The cleaning agent further comprises 5-hydroxymethylfurfural, and the added amount of the 5-hydroxymethylfurfural is 0.1-0.3%; and the 5-hydroxymethylfurfural is added simultaneously with the calcium lignosulfonate.

8. Application of the cleaning agent of any one of claims 1-5 in the petroleum chemical industry and oil refining industry for deodorization and reducing ferrous sulfide-induced safety accidents.

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