Preparation method and application of acid gas inhibitor for solid chemical oxygen source

Abstract

The application discloses a preparation method and application of an acidic gas inhibitor for solid chemical oxygen sources, and comprises the following steps: mixing an alkali source and permanganate in a proper proportion, adding pure water, and stirring to obtain a purple-red slurry; reacting the purple-red slurry at 115 DEG C to 130 DEG C under nitrogen protection for 1 to 2 hours to obtain a reactant; adding 5% sodium hydroxide solution into the reactant in a proper proportion, continuing to react for 1 hour to obtain a black reaction product; taking out the black reaction product and naturally cooling to room temperature under nitrogen protection; adding the black reaction product cooled to room temperature into a thickening agent, a catalyst and a plasticizing agent in a proper proportion, stirring until mixed uniformly, and then pouring out; drying at 70 DEG C for 1 to 2 hours, grinding, sieving, and obtaining black-green particles; and applying the black-green particles. The application has simple process, wide raw material sources, can effectively reduce the concentration of acidic gas in the use process of the solid chemical oxygen source, and improves the use effect and user experience of the solid chemical oxygen source.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of preparation and application of acid gas inhibitors, in particular to a preparation method and application of an acid gas inhibitor for solid chemical oxygen sources. BACKGROUND

[0002] The solid chemical oxygen source is generally made of chlorate or perchlorate as the main oxygen-producing agent, and mixed with metal fuel, catalyst, binder, etc. in a certain proportion, and then dry (wet) pressed or cast. The starting principle of the solid chemical oxygen source is that the heat generated by the starting device increases the internal temperature of the oxygen candle to the decomposition temperature of the oxygen-producing agent, and the agent block reacts when pressed to release oxygen.

[0003] 2MClO3→ 2MCl + 3O2↑

[0004] MClO4→ MCl + 2O2↑

[0005] During the processing of the solid chemical oxygen source, carbon, water, organic matter and other impurities are inevitably mixed in. These impurities will cause the oxygen-producing agent to react or generate chlorine, carbon dioxide, nitrogen oxides and other acid gases during the decomposition of the oxygen-producing agent. The generation of acid gases will adversely affect the health of the user. Therefore, the content of acid gases is strictly regulated in national and industry standards.

[0006] At present, in the solid chemical sources at home and abroad, only expensive and toxic chlorine removal agents are often added to eliminate or reduce the content of chlorine, and there are few corresponding treatment measures for other acid gases. SUMMARY

[0007] To solve at least one of the problems in the above background art, the present application provides a preparation method and application of an acid gas inhibitor for solid chemical oxygen sources.

[0008] The preparation method and application of an acid gas inhibitor for solid chemical oxygen sources provided by the embodiments of the present application include the following six steps:

[0009] Step 1: Mix the alkali source and permanganate in proportion, add pure water, and stir to obtain a purple red slurry;

[0010] Step 2: React the purple red slurry at 115-130°C under nitrogen protection for 1-2 hours to obtain a reaction product;

[0011] Step 3: Add 5% sodium hydroxide solution to the reaction product in proportion, and continue to react for 1 hour to obtain a black reaction product;

[0012] Step 4: Take out the black reaction product and cool it to room temperature under nitrogen protection;

[0013] Step five: the ink green reaction product cooled to room temperature is added to the thickening agent, catalyst, plasticizing agent in proportion, stirred until mixed evenly, poured out, dried at 70°C for 1 to 2 hours, ground, sieved, to obtain ink green particles, which are the acidic gas inhibitor for solid chemical oxygen source;

[0014] Step six: the acidic gas inhibitor for solid chemical oxygen source is applied in the solid chemical oxygen source and the initial oxygen generator of the self-rescuer;

[0015] Among them, the alkali source is one or more of sodium hydroxide, potassium hydroxide, barium hydroxide, calcium hydroxide; the permanganate is one or more of sodium permanganate, potassium permanganate, calcium permanganate; the pure water is deionized water boiled to remove carbon dioxide; the particle size of the acidic gas inhibitor for solid chemical oxygen source is 20 to 30 mesh.

[0016] Further, in the above preparation method and application of the acidic gas inhibitor for solid chemical oxygen source, the thickening agent is one or more of polyvinylpyrrolidone, carboxymethyl cellulose, hydroxyethyl cellulose, polyanionic cellulose, polyethylene glycol bis-stearate.

[0017] Further, in the above preparation method and application of the acidic gas inhibitor for solid chemical oxygen source, the synergist is one or more of ferrous oxide, cobaltous oxide, manganese dioxide, triiron tetroxide, tricobalt tetroxide.

[0018] Further, in the above preparation method and application of the acidic gas inhibitor for solid chemical oxygen source, the plasticizing agent is one or more of kaolin, bentonite, diatomite, soluble starch, calcium fluoride.

[0019] Further, in the above preparation method and application of the acidic gas inhibitor for solid chemical oxygen source, the mass ratio of each component in the ink green particles is as follows: alkali source 22% to 34%, permanganate 12% to 20%, 5% sodium hydroxide 8 to 10%, thickening agent 0.01% to 0.02%, synergist 5% to 9%, plasticizing agent 18% to 25%, and the rest is water.

[0020] Further, in the above preparation method and application of the acidic gas inhibitor for solid chemical oxygen source, the application of the acidic gas inhibitor for solid chemical oxygen source includes: the acidic gas inhibitor is filled as acidic gas filtering material at the end of the solid chemical oxygen source oxygen generating block.

[0021] Among them, the oxygen generating block is one or more of sodium chlorate, sodium perchlorate, potassium chlorate and potassium perchlorate, and is mixed with metal fuel, catalyst, binder, etc. in a certain proportion and then dry / wet pressed or cast.

[0022] Furthermore, in the preparation method and application of the above-mentioned acid gas inhibitor for solid chemical oxygen source, the application of the acid gas inhibitor for solid chemical oxygen source includes: the acid gas inhibitor is used in combination with hogallat agent to suppress harmful gases generated by solid chemical oxygen source.

[0023] Among them, the hogalat agent is a granular catalyst made of active manganese dioxide and copper oxide in a certain proportion, and the harmful gas is one or more of carbon dioxide, nitrogen oxides, chlorine and carbon monoxide.

[0024] Furthermore, in the preparation method and application of the above-mentioned acid gas inhibitor for solid chemical oxygen source, the application of the acid gas inhibitor for solid chemical oxygen source includes: the acid gas inhibitor and hogalat agent can be pre-compressed into columnar or sheet-like blocks, with a waterproof isolation layer added in the middle, and the blocks are placed at the end of the solid chemical oxygen source oxygen-generating blocks during use.

[0025] Among them, the hogalat agent is a granular catalyst made of active manganese dioxide and copper oxide in a certain proportion, and the waterproof isolation layer is one or more of zinc stearate, calcium stearate, and magnesium stearate.

[0026] The beneficial effects of this invention are as follows: This invention involves mixing an alkali source and permanganate in a specific ratio, adding pure water, and stirring to obtain a purplish-red slurry. The purplish-red slurry is then reacted at 115°C to 130°C under nitrogen protection for 1 to 2 hours to obtain a reactant. A 5% sodium hydroxide aqueous solution is added to the reactant in a specific ratio, and the reaction continues for 1 hour to obtain a dark-colored reaction product. The dark-colored reaction product is then removed and naturally cooled to room temperature under nitrogen protection. Thickener, catalyst, and plasticizer are added to the cooled dark-colored reaction product in a specific ratio, and the mixture is stirred until homogeneous. The product is then poured out, dried at 70°C for 1 to 2 hours, ground, and sieved to obtain dark green granules. These dark green granules are then applied. This invention not only has a simple process and widely available raw materials, but also effectively reduces the concentration of acidic gases during the use of solid chemical oxygen sources, improving the performance and user experience of solid chemical oxygen sources. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram illustrating the preparation method and application process of an acid gas suppressant for a solid chemical oxygen source, provided in an embodiment of the present invention. Detailed Implementation

[0029] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific implementations disclosed below.

[0030] 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 this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0031] Figure 1 A preparation method and application flowchart of an acidic gas inhibitor for solid chemical oxygen source are provided for embodiments of the present application.

[0032] The preparation method and application of the acidic gas inhibitor for solid chemical oxygen source provided by the embodiments of the present application are combined with Figure 1 , including six steps S101 to S106:

[0033] S101: Mix an alkali source and permanganate in proportion, add pure water, and stir to obtain a purple-red slurry.

[0034] Specifically, in the embodiments of the present application, the alkali source is one or more of sodium hydroxide, potassium hydroxide, barium hydroxide, and calcium hydroxide; the permanganate is one or more of sodium permanganate, potassium permanganate, and calcium permanganate; and the pure water is deionized water boiled to remove carbon dioxide.

[0035] S102: React the purple-red slurry at 115°C to 130°C under nitrogen protection for 1 to 2 hours to obtain a reactant.

[0036] S103: Add 5% sodium hydroxide aqueous solution to the reactant in proportion, continue to react for 1 hour, and obtain a black reaction product.

[0037] S104: Take out the black reaction product and naturally cool to room temperature under nitrogen protection.

[0038] S105: Add a thickening agent, a catalyst, and a plasticizing agent to the black reaction product cooled to room temperature in proportion, stir until mixed uniformly, pour out, dry at 70°C for 1 to 2 hours, grind, and sieve to obtain dark green particles, which are the acidic gas inhibitor for solid chemical oxygen source.

[0039] Specifically, in the embodiments of the present application, the particle size of the acid gas inhibitor for solid chemical oxygen source is 20 to 30 mesh, the thickening agent is one or more of polyvinylpyrrolidone, carboxymethyl cellulose, hydroxyethyl cellulose, polyanionic cellulose, and polyethylene glycol bis-stearate, the synergist is one or more of ferrous oxide, cobaltous oxide, manganese dioxide, and triiron tetroxide, the plasticizing agent is one or more of kaolin, bentonite, diatomite, soluble starch, and calcium fluoride, and the mass ratio of the components in the green particles is as follows: alkali source 22% to 34%, permanganate 12% to 20%, 5% sodium hydroxide 8 to 10%, thickening agent 0.01% to 0.02%, synergist 5% to 9%, plasticizing agent 18% to 25%, and the rest is water.

[0040] S106: The acid gas inhibitor for solid chemical oxygen source is applied in the solid chemical oxygen source and the initial oxygen generator of the self-rescuer.

[0041] Specifically, in the embodiments of the present application, the acid gas inhibitor for solid chemical oxygen source is applied, which includes that the acid gas inhibitor is filled as an acid gas filtering material at the end of the oxygen generation tablet of the solid chemical oxygen source; wherein the oxygen generation tablet is one or more of sodium chlorate, sodium perchlorate, potassium chlorate, and potassium perchlorate, and is mixed with metal fuel, catalyst, binder, etc. in a certain proportion and then dry / wet pressed or cast.

[0042] The acid gas inhibitor for solid chemical oxygen source is also applied in combination with the Hogalate agent to inhibit the harmful gases generated by the solid chemical oxygen source; wherein the Hogalate agent is a granular catalyst made of active manganese dioxide and copper oxide in a certain proportion, and the harmful gases are one or more of carbon dioxide, nitrogen oxide, chlorine, and carbon monoxide.

[0043] The acid gas inhibitor for solid chemical oxygen source is also applied in combination with the Hogalate agent, which can be pre-pressed into a columnar or sheet-shaped tablet with a waterproof isolation layer in the middle, and the tablet is placed at the end of the oxygen generation tablet of the solid chemical oxygen source when used; wherein the Hogalate agent is a granular catalyst made of active manganese dioxide and copper oxide in a certain proportion, and the waterproof isolation layer is one or more of zinc stearate, calcium stearate, and magnesium stearate.

[0044] The following describes a preparation method of an acid gas inhibitor for solid chemical oxygen source in combination with six embodiments.

[0045] Example 1

[0046] Mix 200 g of sodium hydroxide, 92 g of sodium permanganate and 111 g of pure water, and stir until uniform. Heat the resulting purple-red slurry to 120°C under nitrogen, and maintain the temperature for 1.5 hours. After completion, add 65 g of 5% sodium hydroxide aqueous solution to the reaction vessel, and continue the reaction for 1 hour to obtain a dark green reaction product. Stop heating, and cool to room temperature under nitrogen. After cooling, add 0.1 g of polyvinylpyrrolidone, 50 g of cobaltous oxide, and 150 g of diatomite, one after another, while stirring. Continue stirring, mix until uniform, and dry at 70°C for 1 hour. Grind, and separate by size using a 20-mesh sieve to obtain dark green particles.

[0047] Example 2

[0048] Mix 224 g of potassium hydroxide, 100 g of potassium permanganate and 125 g of pure water, and stir until uniform. Heat the resulting purple-red slurry to 125°C under nitrogen, and maintain the temperature for 1 hour. After completion, add 65 g of 5% sodium hydroxide aqueous solution to the reaction vessel, and continue the reaction for 1 hour to obtain a dark green reaction product. Stop heating, and cool to room temperature under nitrogen. After cooling, add 0.1 g of hydroxymethyl cellulose, 60 g of manganese dioxide, and 130 g of kaolin, one after another, while stirring. Continue stirring, mix until uniform, and dry at 70°C for 1 hour. Grind, and separate by size using a 30-mesh sieve to obtain dark green particles.

[0049] Example 3

[0050] Mix 190 g of calcium hydroxide, 95 g of calcium permanganate and 115 g of pure water, and stir until uniform. Heat the resulting purple-red slurry to 130°C under nitrogen, and maintain the temperature for 1.5 hours. After completion, add 60 g of 5% sodium hydroxide aqueous solution to the reaction vessel, and continue the reaction for 1.5 hours to obtain a dark green reaction product. Stop heating, and cool to room temperature under nitrogen. After cooling, add 0.1 g of hydroxymethyl cellulose, 55 g of ferric oxide, and 120 g of bentonite, one after another, while stirring. Continue stirring, mix until uniform, and dry at 70°C for 1 hour. Grind, and separate by size using a 30-mesh sieve to obtain dark green particles.

[0051] Example 4

[0052] Mix 180 g of sodium hydroxide, 100 g of sodium permanganate and 95 g of pure water, and stir until uniform. Heat the resulting purple-red slurry to 125°C under nitrogen, and maintain the temperature for 1 hour. After the reaction is complete, add 60 g of 5% sodium hydroxide solution to the reaction vessel, and continue the reaction for 1 hour to obtain a dark green reaction product. Stop heating, and cool to room temperature under nitrogen. After cooling, add 0.08 g of polyvinylpyrrolidone, 55 g of manganese dioxide, and 150 g of diatomite, and stir until uniform. Dry at 70°C for 2 hours, grind, and sieve to obtain dark green particles.

[0053] Example 5

[0054] Mix 200 g of barium hydroxide, 95 g of potassium permanganate, and 120 g of pure water, and stir until uniform. Heat the resulting purple-red slurry to 120°C under nitrogen, and maintain the temperature for 1 hour. After the reaction is complete, add 65 g of 5% sodium hydroxide solution to the reaction vessel, and continue the reaction for 1 hour to obtain a dark green reaction product. Stop heating, and cool to room temperature under nitrogen. After cooling, add 0.08 g of polyethylene glycol bis-stearate, 50 g of cobaltous oxide, and 125 g of calcium fluoride, and stir until uniform. Dry at 70°C for 1.5 hours, grind, and sieve to obtain dark green particles.

[0055] Example 6

[0056] Mix 185 g of sodium hydroxide, 85 g of potassium permanganate, and 115 g of pure water, and stir until uniform. Heat the resulting purple-red slurry to 120°C under nitrogen, and maintain the temperature for 1 hour. After the reaction is complete, add 60 g of 5% sodium hydroxide solution to the reaction vessel, and continue the reaction for 1.5 hours to obtain a dark green reaction product. Stop heating, and cool to room temperature under nitrogen. After cooling, add 0.07 g of polyanionic cellulose, 50 g of cobaltous tetroxide, and 125 g of bentonite, and stir until uniform. Dry at 70°C for 1.5 hours, grind, and sieve to obtain dark green particles.

[0057] The inhibitors prepared in Examples 1 to 6 above were used in oxygen purification tests for initial oxygen generators of an isolated chemical oxygen self-rescuer, and the oxygen purification tests for initial oxygen generators of an isolated chemical oxygen self-rescuer using chlorate as the main oxygen generator. In the tests, the oxygen generation reagent was first loaded into the shell of the oxygen generator, and then the inhibitor was loaded, and the bottom cover was welded and fixed using a laser, and a blank control test was performed. The test process was performed in accordance with the relevant items in AQ 1057-2008 Chemical Oxygen Self-Rescuer Initial Oxygen Generator and MT 426-1995 Chlorate Oxygen Generation Starter Technical Conditions regarding the concentration of harmful gases. The test results are shown in the following table.

[0058]

[0059] From the results of the above examples, it can be seen that Examples 1 to 6 significantly reduce the content of acid gases and have a remarkable oxygen purifying effect on the oxygen generator.

[0060] Those skilled in the art will appreciate that a combination of features of different embodiments means that they are within the scope of the application and form different embodiments, even though some embodiments described herein include certain features but not others that are included in other embodiments.

[0061] Those skilled in the art will appreciate that the description of the various embodiments is focused in each case on certain aspects of the application and that the relevant description of other embodiments can be consulted in respect of aspects that have not been dealt with in detail in a certain embodiment.

[0062] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements shall be encompassed within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for producing an acid gas inhibitor for solid chemical oxygen sources, characterized by, It comprises the following six steps: Step one: mix the alkali source and permanganate in proportion, add pure water, and stir to obtain a purple-red slurry; Step two: react the purple-red slurry at 115-130°C under nitrogen protection for 1-2 hours to obtain a reaction product; Step three: add 5% sodium hydroxide solution to the reaction product in proportion, continue to react for 1 hour to obtain an ink-colored reaction product; Step four: take out the ink-colored reaction product and cool it to room temperature under nitrogen protection; Step five: add thickening agent, synergist, and plasticizing agent to the ink-colored reaction product cooled to room temperature in proportion, stir until mixed evenly, pour out, dry at 70°C for 1-2 hours, grind, sieve, and obtain ink-green particles, which are the acid gas inhibitor for solid chemical oxygen source; Step six: apply the acid gas inhibitor for solid chemical oxygen source in the initial oxygen generator of the self-rescuer and the solid chemical oxygen source; The alkali source is one or more of sodium hydroxide, potassium hydroxide, barium hydroxide, and calcium hydroxide; the permanganate is one or more of sodium permanganate, potassium permanganate, and calcium permanganate; the pure water is deionized water boiled to remove carbon dioxide; the particle size of the acid gas inhibitor for solid chemical oxygen source is 20-30 mesh; The acid gas inhibitor is filled as an acid gas filtering material at the end of the solid chemical oxygen source oxygen-generating tablet; the oxygen-generating tablet is one or more of sodium chlorate, sodium perchlorate, potassium chlorate, and potassium perchlorate, which is mixed with metal fuel, catalyst, and binder in a certain proportion and then dry / wet pressed or cast.

2. The method of claim 1, wherein the acid gas inhibitor for solid chemical oxygen sources is prepared by the steps of: The thickening agent is one or more of polyvinylpyrrolidone, carboxymethyl cellulose, hydroxyethyl cellulose, polyanionic cellulose, and polyethylene glycol bis-stearate.

3. The method of claim 1, wherein the acid gas inhibitor for solid chemical oxygen sources is prepared by the steps of: The synergist is one or more of ferrous oxide, cobaltous oxide, manganese dioxide, triiron tetroxide, and tricobalt tetroxide.

4. The method of claim 1, wherein the acid gas inhibitor for solid chemical oxygen sources is prepared by the steps of: The plasticizing agent is one or more of kaolin, bentonite, diatomite, soluble starch, and calcium fluoride.

5. The method of claim 1, wherein the acid gas inhibitor for solid chemical oxygen sources is prepared by the steps of: The mass ratio of the components in the ink-green particles is as follows: alkali source 22-34%, permanganate 12-20%, 5% sodium hydroxide solution 8-10%, thickening agent 0.01-0.02%, synergist 5-9%, plasticizing agent 18-25%, and the rest is water.

6. Use of an acid gas inhibitor, characterized in that The acid gas inhibitor for solid chemical oxygen source is prepared by the method of any one of claims 1-5.

7. Use of an acid gas suppressant according to claim 6, characterised in that, The acid gas inhibitor is used in combination with Hogalate agent to inhibit harmful gases generated by solid chemical oxygen source; The Hogalate agent is a granular catalyst made of active manganese dioxide and copper oxide in a certain proportion, and the harmful gases are one or more of carbon dioxide, nitrogen oxide, chlorine, and carbon monoxide.

8. Use of an acid gas suppressant according to claim 6, characterised in that, The acid gas inhibitor and Hogalate agent are pre-pressed into cylindrical or sheet-shaped tablets with a waterproof isolation layer in the middle, and the tablets are placed at the end of the solid chemical oxygen source oxygen-generating tablet during use. The Hogalate agent is a granular catalyst made of active manganese dioxide and copper oxide in a certain proportion, and the waterproof isolation layer is one or more of zinc stearate, calcium stearate, and magnesium stearate.

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