Glass jacket cleaning agent and preparation method thereof

Abstract

The invention discloses a glass jacket cleaning agent which comprises the following components in percentage by mass: 0.4%-1.0% of diluted hydrochloric acid, 0.01%-0.05% of EDTA-2Na (Ethylene Diamine Tetraacetic Acid), 0.06%-0.20% of citric acid and the balance of water. The cleaning agent is safe to use, the cleaning time is 4-8 hours, and the descaling rate can almost reach 100%. The scale remover is simple in composition and small in dosage, materials can be effectively saved, cost can be effectively reduced, and scale can be effectively removed under the condition of low acid concentration. After scale is removed by the glass jacket, liquid in the reaction kettle can be ensured to be uniformly heated or cooled, which is crucial to the accuracy and repeatability of experiments.

Description

Technical Field

[0001] The invention relates to the field of descaling agents, and in particular to a glass jacket cleaning agent and a preparation method thereof. Background Art

[0002] Glass jacket is a common laboratory and industrial equipment accessory, mainly used to control the temperature in a reactor or container. By installing a glass jacket on the outer wall of the device, cooling water or heating agent can be introduced to achieve precise heating or cooling of the liquid in the reactor.

[0003] Water contains a lot of minerals, such as calcium and magnesium ions. When this water comes into contact with glass, especially at high temperatures or when it is left standing for a long time, the minerals in the water will react chemically with the surface of the glass, resulting in the formation of white deposits that are insoluble in water, which is what we call scale. The main components of these scales are calcium carbonate, magnesium carbonate, magnesium hydroxide, calcium sulfate, magnesium sulfate, etc. When the calcium ions in the water encounter carbon dioxide or other acidic substances on the surface of the glass, they react to form these deposits. Over a long period of accumulation, scale will form a film or hard block on the surface of the glass that is difficult to clean. The surface of glass is relatively smooth, but it is not completely flat on a microscopic scale. These tiny bumps increase the contact area between water and the glass surface, making it easier for minerals in the water to adhere to the glass to form scale. In addition, due to the structural design of the jacket, cleaning is extremely inconvenient, which makes it easier to accelerate the formation of scale.

[0004] At present, the main methods for descaling are physical cleaning, organic acid cleaning, and inorganic acid cleaning. Physical cleaning is more difficult for equipment with a jacket structure and is prone to damage to the instrument; inorganic acid cleaning is more volatile, easy to corrode the equipment, and easy to scale again after cleaning; organic acid cleaning has a high cost and poor descaling ability. Chinese patent CN115386885A discloses an acid cleaning agent composed of concentrated hydrochloric acid, phosphoric acid, sodium citrate, coconut oil fatty alcohol polyoxyethylene ether, urotop, modified polyether, and deionized water, but concentrated hydrochloric acid has high corrosiveness and volatility during use, and the total amount of acid added accounts for 5-30% of the acid cleaning agent by weight, and the acid content is relatively high. Chinese patent CN108342256A discloses a heat exchange equipment water system cleaning agent, which is composed of 5-7 parts of hydrochloric acid, 1.7-2.3 parts of nitric acid, citric acid, alkyl polyglucoside, coconut oil alcohol, EDTA, corrosion inhibitor, scale inhibitor, and water, but there are many types of acids and the configuration is complicated. Chinese patent CN105695169A discloses a water heater descaling agent, which is composed of 65% to 90% acidic descaling components, 1% to 5% composite corrosion inhibitor, 1% to 5% penetrant, 1% to 5% defoaming agent, 6% to 15% metal chelating agent and 1% to 5% rust inhibitor. The higher acid concentration content is easily corrosive to the instrument. Summary of the invention

[0005] The purpose of the present invention is to provide a low-concentration acidic scale cleaning agent with simple components and small amounts of each component, which can save materials and costs while efficiently removing scale. After removing the scale, it can ensure that the liquid in the reactor is evenly heated or cooled, which is crucial to the accuracy and repeatability of the experiment.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A glass jacket cleaning agent is composed of the following raw material components in weight percentage: 0.4% to 1.0% of dilute hydrochloric acid, 0.01% to 0.05% of EDTA-2Na, 0.06% to 0.20% of citric acid, and the balance is water.

[0008] Furthermore, dilute hydrochloric acid 0.4% to 0.8%, EDTA-2Na 0.01% to 0.03%, citric acid 0.06% to 0.10%, and the balance is water.

[0009] Furthermore, dilute hydrochloric acid 0.6%, EDTA-2Na 0.02%, citric acid 0.08%, and the balance is water.

[0010] Wherein, the mass ratio of the citric acid to the dilute hydrochloric acid is 1:5 to 1:10.

[0011] Wherein, the mass ratio of the dilute hydrochloric acid to EDTA-2Na is 1:25 to 1:40.

[0012] The preparation method of the cleaning agent of the present invention comprises the following steps:

[0013] 1) At room temperature, add dilute hydrochloric acid, EDTA-2Na and citric acid into a certain amount of water and stir to mix evenly;

[0014] 2) Pour the evenly mixed liquid into the glass jacket and heat it at 40-60°C for 4-8 hours.

[0015] Furthermore, the uniformly mixed liquid is filled into a glass jacket and heated and circulated at 50° C. for 4 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing the cleaning effect of the glass jacket according to Example 3 of the present invention.

[0017] Figure 2 This is a diagram showing the cleaning effect of the glass jacket of Comparative Example 1 of the present invention.

[0018] Figure 3 This is a diagram showing the cleaning effect of the glass jacket of Comparative Example 2 of the present invention.

[0019] Figure 4This is a diagram showing the cleaning effect of the glass jacket of Comparative Example 3 of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Examples 1 to 6 Preparation of the glass jacket cleaning agent of the present invention

[0022] At room temperature, add dilute hydrochloric acid, EDTA-2Na and citric acid to a certain amount of water according to the ratio shown in Table 1, stir and mix evenly, then fill the cleaning agent into the glass jacket, and then heat and circulate at 40-60°C for 4-8 hours.

[0023] Table 1 Composition and proportion of glass jacket cleaning agent

[0024]

[0025] Example 7 Comparative test of glass jacket cleaning agent of the present invention

[0026] In order to prove that the combination of cleaning agents of the present invention is superior to a single formula in the composition, we conducted a comparative test. The configuration method of the comparative cleaning agent is consistent with that of Examples 1 to 6. The configuration ratio is shown in Table 2. The test results are shown in Table 3.

[0027] Table 2 Comparative test cleaning agent composition and proportion table

[0028]

[0029]

[0030] Table 3 Cleaning agent performance comparison test results

[0031]

[0032] From the results of the performance comparison test, the various properties of the present invention are better than those of the comparative test. The cleaning time is 4 to 8 hours, which is 1 / 6 to 1 / 3 of the cleaning time of the comparative product, effectively reducing the time cost and improving the cleaning efficiency; the cleaning effect of the scale removal rate of the present invention is obvious (the glass jacket becomes clear and transparent after cleaning, and the experimental phenomenon can be effectively observed through the glass jacket) and the results are stable and reliable, which also proves the excellent performance of the cleaning agent.

[0033] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technical personnel in the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, the technical personnel in the relevant technical field should understand that the technical personnel in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A glass jacket cleaning agent, characterized in that: The invention is composed of the following raw material components in weight percentage: 0.4% to 1.0% of dilute hydrochloric acid, 0.01% to 0.05% of EDTA-2Na, 0.06% to 0.20% of citric acid, and the balance is water.

2. The cleaning agent according to claim 1, characterized in that The invention is composed of the following raw material components in weight percentage: 0.4% to 0.8% of dilute hydrochloric acid, 0.01% to 0.03% of EDTA-2Na, 0.06% to 0.10% of citric acid, and the balance is water.

3. The cleaning agent according to claim 2, characterized in that The invention is composed of the following raw material components in weight percentage: 0.6% of dilute hydrochloric acid, 0.02% of EDTA-2Na, 0.08% of citric acid, and the balance of water.

4. The cleaning agent according to any one of claim 1, characterized in that The mass ratio of the citric acid to the dilute hydrochloric acid is 1:5 to 1:

10.

5. The cleaning agent according to any one of claim 1, characterized in that The mass ratio of the dilute hydrochloric acid to EDTA-2Na is 1:25 to 1:

40.

6. The method for preparing the cleaning agent according to any one of claims 1 to 5, characterized in that: The following steps are involved: 1) At room temperature, add dilute hydrochloric acid, EDTA-2Na and citric acid into a certain amount of water in a certain proportion and stir to mix evenly; 2) Pour the evenly mixed liquid into the glass jacket and heat it at 40-60°C for 4-8 hours.

7. The method for preparing the cleaning agent according to claim 6, characterized in that: The uniformly mixed liquid is filled into a glass jacket and heated at 50° C. for 4 hours.

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