Metal-free acetaldehyde stabilizer as well as preparation method and application thereof

Abstract

The invention discloses a metal-free acetaldehyde stabilizer as well as a preparation method and application thereof. The acetaldehyde stabilizer comprises organic amine and / or ammonium hydroxide, organic acid and / or inorganic acid, acetaldehyde and a solvent. According to the acetaldehyde stabilizer disclosed by the invention, the component concentration of the stabilizer is controlled to reach a proper level through a proper ratio, so that the stimulation effect of trace impurities in acetaldehyde on the self reaction of the acetaldehyde is inhibited, and the stability of liquid acetaldehyde is maintained. The acetaldehyde stabilizer does not contain metal, solves the problem that the metal may bring adverse effects to an incineration device, and can be used for long-term retention and subsequent incineration treatment of liquid acetaldehyde in devices such as a liquid separation tank and a buffer tank and auxiliary pipelines.

Description

Technical Field

[0001] The present invention relates to the field of acetaldehyde stabilizers, and specifically, to a metal-free acetaldehyde stabilizer, a preparation method thereof, and an application thereof. Background Art

[0002] The boiling point of acetaldehyde at normal pressure is 20.8 °C. It has an aldehyde group and α-hydrogen in its structure, and its chemical properties are active. It can be used to produce acetic acid, ethyl acetate, crotonaldehyde, 1,3-butanediol, pentaerythritol, etc. Acetaldehyde molecules can undergo an acetal reaction to form paraldehyde and metaldehyde, or an aldol condensation reaction to form β-hydroxyaldehyde, which is further dehydrated to form enal. β-Hydroxyaldehyde or enal can continue to undergo an aldol condensation reaction with acetaldehyde to form hydroxyaldehyde or enal with a longer carbon chain and a larger molecular weight. As the polymerization reaction proceeds, the carbon chain grows and the molecular weight increases, and acetaldehyde gradually deteriorates, turning from colorless to reddish-brown, with its fluidity gradually decreasing, becoming viscous or even solidifying.

[0003] In some industrial reaction devices, a small amount of acetaldehyde by-produced in the reaction device needs to be centrally collected and incinerated regularly. During storage, trace impurities in acetaldehyde will promote the aldol condensation reaction of acetaldehyde, resulting in continuous polymerization and loss of liquid fluidity, seriously affecting the subsequent treatment process of the substance.

[0004] Adding a stabilizer to liquid acetaldehyde can maintain the fluidity of acetaldehyde in equipment and pipelines, facilitating subsequent incineration treatment. However, if the stabilizer contains metal components, it will cause problems such as the long-term treatment of salt-containing waste liquid in the incineration device, the formation of inorganic salts, melting and caking on the wall, ash accumulation, and even furnace shutdown.

[0005] Patent CN1479711A discloses a method for stabilizing phenylacetaldehyde against polymerization and auto-condensation. This method stabilizes phenylacetaldehyde by adding an additive composed of at least one polycarboxylic acid. The polycarboxylic acids used are oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, citric acid, maleic acid, fumaric acid, or a combination of these acids.

[0006] Patent CN115991641A discloses an acetaldehyde stabilizer, which mainly consists of organic acids, hydrochlorides, organic acid salts, acetaldehyde, solvents, etc., and can prevent liquid acetaldehyde at normal temperature from self-polymerizing and deteriorating, maintaining the fluidity of acetaldehyde liquid. However, this stabilizer contains metal components, which may have an adverse impact on the incineration device. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to avoid the polymerization of liquid acetaldehyde at normal temperature in the presence of impurities, provide a stabilizer to avoid the polymerization of acetaldehyde and maintain its liquid state. At the same time, metal components are not introduced into liquid acetaldehyde to avoid adverse effects on the device during subsequent incineration treatment.

[0008] One of the objectives of the present invention is to provide a metal-free acetaldehyde stabilizer, which comprises the following components in parts by weight:

[0009] 100 parts of organic amine and / or ammonium hydroxide;

[0010] 2 - 80 parts of organic acid and / or inorganic acid;

[0011] 5 - 40 parts of acetaldehyde;

[0012] 2 - 100 parts of solvent.

[0013] According to a preferred embodiment of the present invention, the acetaldehyde stabilizer comprises the following components in parts by weight:

[0014] 100 parts of organic amine and / or ammonium hydroxide;

[0015] 5 - 40 parts of organic acid and / or inorganic acid;

[0016] 10 - 35 parts of acetaldehyde;

[0017] 5 - 80 parts of solvent.

[0018] The acetaldehyde stabilizer of the present invention does not contain metal components.

[0019] According to some preferred embodiments of the present invention, the pH value of the acetaldehyde stabilizer is 4.0 - 10.0, where the pH can specifically be 4, 5, 6, 7, 8, 9, 10, etc.

[0020] According to some preferred embodiments of the present invention, the organic amine is selected from at least one of aliphatic amine, alkanolamine, amide, cycloaliphatic amine, aromatic amine, and naphthalene-based amine.

[0021] According to some more preferred embodiments of the present invention, the organic amine is selected from at least one of methylamine, triethylamine, triethanolamine, hexamethylenetetramine, and aniline.

[0022] According to some preferred embodiments of the present invention, the organic acid or inorganic acid is a strong acid.

[0023] According to some preferred embodiments of the present invention, the inorganic acid is selected from at least one of hydrochloric acid, nitric acid, sulfuric acid, perchloric acid, metaperiodic acid, perbromic acid, hydrobromic acid, hydroiodic acid, chloric acid, permanganic acid, bromic acid, fluoboric acid, and fluorosulfonic acid.

[0024] According to some preferred embodiments of the present invention, the organic acid is selected from at least one of methanesulfonic acid, trifluoromethanesulfonic acid, trifluoroacetic acid, trichloroacetic acid, 2,4,6-trinitrophenol, benzenesulfonic acid, and 2,4,6-trinitrobenzoic acid.

[0025] According to some preferred embodiments of the present invention, the solvent is water.

[0026] According to the present invention, the water may be deionized water or distilled water.

[0027] The acetaldehyde stabilizer of the present invention is a metal-free stabilizer that can prevent the polymerization of liquid acetaldehyde at room temperature.

[0028] A second object of the present invention is to provide a method for preparing the acetaldehyde stabilizer described in the first object of the present invention, which includes mixing components including organic amine and / or ammonium hydroxide, organic acid and / or inorganic acid, acetaldehyde, and a solvent.

[0029] Preferably, the preparation method may include adding at least one of organic amine and / or ammonium hydroxide to a mixed solution of acetaldehyde and a solvent, and then adding at least one of organic acid and / or inorganic acid.

[0030] According to some preferred embodiments of the present invention, the method for preparing the acetaldehyde stabilizer may include the following steps:

[0031] 1) Take an aqueous acetaldehyde solution, slowly add organic amine and / or ammonium hydroxide under stirring conditions, and stir until the solid is completely dissolved;

[0032] 2) Continuously add organic acid and / or inorganic acid to the solution obtained in step 1) and stir evenly. Measure the pH of the mixed solution to be 4.0 - 10.0 to obtain the acetaldehyde stabilizer.

[0033] Among them, the acetaldehyde may be in the form of an aqueous acetaldehyde solution, and the organic acid or inorganic acid may be in the form of an aqueous solution.

[0034] A third object of the present invention is to provide the application of the acetaldehyde stabilizer described in the first object of the present invention or the acetaldehyde stabilizer obtained by the preparation method described in the second object of the present invention in the storage of liquid acetaldehyde.

[0035] According to some preferred embodiments of the present invention, the application is the application as a liquid acetaldehyde additive.

[0036] According to some preferred embodiments of the present invention, the application is to mix the acetaldehyde stabilizer with liquid acetaldehyde.

[0037] According to some more preferred embodiments of the present invention, the dosage of the acetaldehyde stabilizer is 0.001 - 5 wt% of liquid acetaldehyde.

[0038] According to some most preferred embodiments of the present invention, the dosage of the acetaldehyde stabilizer is 0.02 - 0.5 wt% of liquid acetaldehyde.

[0039] The acetaldehyde stabilizer of the present invention controls the component concentration of the stabilizer itself to an appropriate level through a suitable ratio, thereby inhibiting the stimulating effect of trace impurities in acetaldehyde on the self-reaction of acetaldehyde and maintaining the stability of liquid acetaldehyde. The present invention has achieved good technical effects.

[0040] The technical solution of the present invention preferably solves the problem that the stabilizer containing metal components may have an adverse impact on the incineration device, and can be used for the long-term retention and subsequent incineration treatment of liquid acetaldehyde in devices such as liquid separation tanks and buffer tanks and their attached pipelines.

[0041] The present invention relates to a metal-free stabilizer for a solvent containing acetaldehyde and a preparation method thereof, mainly solving the problem that an organic waste containing acetaldehyde undergoes an aldol condensation reaction by itself in devices such as liquid separation tanks and buffer tanks and their attached pipelines before incineration treatment, polymerizes and solidifies, loses fluidity, and blocks the pipelines. At the same time, the stabilizer does not contain metal components, which can avoid problems such as molten salt wall formation, ash accumulation, and furnace shutdown caused by the treatment of salt-containing waste liquid in subsequent incineration devices.

[0042] The stabilizer described in the technical solution of the present invention can be used for the stable storage of liquid acetaldehyde. When this stabilizer is put into the storage container of acetaldehyde, acetaldehyde still maintains a clear liquid state when the storage time exceeds 100 days, and the stable system can still be used as a liquid material for subsequent treatment.

[0043] All publications, patent applications, patents, and other references mentioned in this specification are hereby incorporated by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In case of conflict, the definitions in this specification shall prevail.

[0044] When this specification uses prefixes such as "known to those skilled in the art", "prior art", or their similar terms to derive materials, substances, methods, steps, devices, or components, etc., the objects derived by these prefixes cover those commonly used in the art at the time when this application is filed, but also include those that are not commonly used at present but will become recognized by the art as suitable for similar purposes.

[0045] In the context of this specification, any matters or things not mentioned, except for the clearly stated content, directly apply those known in the art without any change. Moreover, any embodiment described herein can be freely combined with one or more other embodiments described herein, and the technical solutions or technical ideas formed thereby shall be regarded as part of the original disclosure or original record of the present invention, and shall not be regarded as new content not disclosed or anticipated herein, unless those skilled in the art consider such combination to be obviously unreasonable.

[0046] The present invention will be further described below through examples, but not limited to this example. Detailed implementation manners

[0047] The present invention will be specifically described below in conjunction with specific embodiments. It is necessary to point out here that the following embodiments are only used for further illustration of the present invention, and cannot be construed as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art to the present invention based on the content of the present invention still fall within the protection scope of the present invention.

[0048] In addition, it should be noted that, among the various specific technical features described in the following specific implementation manners, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination manners.

[0049] Furthermore, any combination can be made between various different implementation manners of the present invention, as long as it does not violate the idea of the present invention. The technical solutions thus formed belong to a part of the original public content of this specification and also fall within the protection scope of the present invention.

[0050] According to the metal-free acetaldehyde stabilizer of the present invention, it includes components such as organic amine and / or ammonium hydroxide, organic acid and / or inorganic acid, acetaldehyde, and solvent.

[0051] Among them, the organic amine and / or ammonium hydroxide is 100 parts; the organic acid and / or inorganic acid is 2 - 80 parts, for example, it can be 2 parts, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 50 parts, 60 parts, 70 parts, 80 parts or any value between the above values or the value range between any two of the above values; the acetaldehyde is 5 - 40 parts, for example, it can be 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts or any value between the above values or the value range between any two of the above values; the solvent is 2 - 100 parts, for example, it can be 2 parts, 5 parts, 10 parts, 20 parts, 30 parts, 40 parts, 50 parts, 60 parts, 70 parts, 80 parts, 90 parts, 100 parts or any value between the above values or the value range between any two of the above values.

[0052] In the following embodiments, unless otherwise specified, the experimental methods used are all conventional methods, and the materials, reagents, etc. used can be purchased from domestic chemical companies.

[0053]

Example 1

[0054] Weigh 10 g of an aqueous acetaldehyde solution (mass fraction 40%), and slowly add 12 g of triethylamine until it dissolves under stirring conditions. Continuously add 3 g of concentrated hydrochloric acid (mass fraction 37%) to the solution and stir evenly. Measure the pH value of the solution to be 8.5, and thus obtain the stabilizer.

[0055] Stabilizer performance test: Add 0.1 mL of the stabilizer to 50.0 mL of liquid acetaldehyde and stir evenly. While stirring, continuously add 1M HCl solution to the liquid acetaldehyde and stir evenly. Stop when the added amount reaches 10 mL. Transfer the liquid to a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is clear and shows no obvious change. Take 1 μL of this liquid and dilute it in 50 mL of analytical pure ethanol, and conduct ultraviolet-visible spectroscopy test on the sample. The result shows that no obvious other signal peaks are found except the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm.

[0056] Stabilizer performance test: Add 0.1 mL of the stabilizer to 50.0 mL of liquid acetaldehyde and stir evenly. While stirring, continuously add 1M NaOH solution to the liquid acetaldehyde and stir evenly. Stop when the added amount reaches 10 mL. Transfer the liquid to a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is clear and shows no obvious change. Take 1 μL of this liquid and dilute it in 50 mL of analytical pure ethanol, and conduct ultraviolet-visible spectroscopy test on the sample. The result shows that no obvious other signal peaks are found except the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm.

[0057]

Example 2

[0058] Weigh 10 g of aqueous acetaldehyde solution (mass fraction 40%), slowly add 28 g of hexamethylenetetramine until dissolved under stirring conditions, continuously add 9.3 g of nitric acid (mass fraction 68%) to the solution and stir evenly. Measure the pH value of the solution to be 9.8 to obtain the stabilizer.

[0059] Stabilizer performance test: Add 0.1 mL of the stabilizer to 50.0 mL of liquid acetaldehyde and stir evenly. While stirring, continuously add 1M HCl solution to the liquid acetaldehyde and stir evenly. Stop when the added amount reaches 10 mL. Transfer the liquid to a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is clear and shows no obvious change. Take 1 μL of this liquid and dilute it in 50 mL of analytical pure ethanol, and conduct ultraviolet-visible spectroscopy test on the sample. The result shows that no obvious other signal peaks are found except the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm.

[0060] Stabilizer performance test: Add 0.1 mL of the stabilizer to 50.0 mL of liquid acetaldehyde and stir evenly. While stirring, continuously add 1 M NaOH solution dropwise to the liquid acetaldehyde and stir evenly. Stop when the added amount reaches 10 mL. Transfer the liquid to a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is clear and shows no obvious change. Take 1 μL of this liquid and dilute it in 50 mL of analytical pure ethanol, and conduct ultraviolet-visible spectroscopy test on the sample. The result shows that no obvious other signal peaks are found except for the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm.

[0061]

Example 3

[0062] Weigh 10 g of aqueous acetaldehyde solution (mass fraction 40%), slowly add 29.8 g of triethanolamine under stirring conditions and stir evenly. Continuously add 9.8 g of concentrated hydrochloric acid (mass fraction 37%) to the solution and stir evenly. Measure the pH value of the solution to be 9.0, and thus obtain the stabilizer.

[0063] Stabilizer performance test: Add 0.1 mL of the stabilizer to 50.0 mL of liquid acetaldehyde and stir evenly. While stirring, continuously add 1 M HCl solution dropwise to the liquid acetaldehyde and stir evenly. Stop when the added amount reaches 10 mL. Transfer the liquid to a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is clear and shows no obvious change. Take 1 μL of the liquid and dilute it in 50 mL of analytical pure ethanol, and conduct ultraviolet-visible spectroscopy test on the sample. The result shows that no obvious other signal peaks are found except for the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm.

[0064] Stabilizer performance test: Add 0.1 mL of the stabilizer to 50.0 mL of liquid acetaldehyde and stir evenly. While stirring, continuously add 1 M NaOH solution dropwise to the liquid acetaldehyde and stir evenly. Stop when the added amount reaches 10 mL. Transfer the liquid to a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is clear and shows no obvious change. Take 1 μL of the liquid and dilute it in 50 mL of analytical pure ethanol, and conduct ultraviolet-visible spectroscopy test on the sample. The result shows that no obvious other signal peaks are found except for the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm.

[0065]

Example 4

[0066] Weigh 10 g of aqueous acetaldehyde solution (mass fraction 40%), slowly add 12 g of triethylamine until it dissolves under stirring conditions. Continuously add 1.5 g of trifluoromethanesulfonic acid to the solution and stir evenly. Measure the pH value of the solution to be 8.1, and thus obtain the stabilizer.

[0067] Stabilizer performance test: Add 0.1 mL of the stabilizer to 50.0 mL of liquid acetaldehyde and stir evenly. While stirring, continuously add 1 M HCl solution to the liquid acetaldehyde and stir evenly. Stop adding when the addition amount reaches 10 mL. Transfer the liquid into a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is clear and shows no obvious change. Take 1 μL of the liquid and dilute it in 50 mL of analytical pure ethanol, and perform ultraviolet-visible spectroscopy on the sample. The result shows that no obvious other signal peaks are found except for the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm.

[0068] Stabilizer performance test: Add 0.1 mL of the stabilizer to 50.0 mL of liquid acetaldehyde and stir evenly. While stirring, continuously add 1 M NaOH solution to the liquid acetaldehyde and stir evenly. Stop adding when the addition amount reaches 10 mL. Transfer the liquid into a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is clear and shows no obvious change. Take 1 μL of the liquid and dilute it in 50 mL of analytical pure ethanol, and perform ultraviolet-visible spectroscopy on the sample. The result shows that no obvious other signal peaks are found except for the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm.

[0069]

Comparative Example 1

[0070] While stirring, continuously add 1 M NaOH solution to 50.0 mL of liquid acetaldehyde and stir evenly. Stop adding when the addition amount reaches 10 mL. Transfer the liquid into a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is brownish. Take 1 μL of the liquid and dilute it in 50 mL of analytical pure ethanol, and perform ultraviolet-visible spectroscopy on the sample. The result shows that in addition to the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm, vibration peaks belonging to conjugated carbon-carbon double bonds (-C=C-C=C-) or enal structures (-C=C-C=O) appear at 320 nm - 330 nm. It indicates that products of aldol condensation and dehydration appear.

[0071]

Comparative Example 2

[0072] While stirring, continuously add 1 M HCl solution to 50.0 mL of liquid acetaldehyde and stir evenly. Stop adding when the addition amount reaches 10 mL. Transfer the liquid into a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days. The liquid is brownish. Take 1 μL of the liquid and dilute it in 50 mL of analytical pure ethanol, and perform ultraviolet-visible spectroscopy on the sample. The result shows that in addition to the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm, vibration peaks belonging to conjugated carbon-carbon double bonds (-C=C-C=C-) or enal structures (-C=C-C=O) appear at 320 nm - 330 nm. It indicates that products of aldol condensation and dehydration appear.

[0073]

Comparative Example 3

[0074] Weigh 10 g of aqueous acetaldehyde solution (mass fraction 40%), and slowly add 12 g of triethylamine until dissolved under stirring to obtain a comparative stabilizer.

[0075] Performance test of the stabilizer: Add 0.1 mL of the comparative stabilizer to 50.0 mL of liquid acetaldehyde, and stir evenly. Continuously add 1 M NaOH solution dropwise to the liquid acetaldehyde under stirring, and stir evenly. Stop when the added amount reaches 10 mL, transfer the liquid into a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days, the liquid is brownish. Take 1 μL of this liquid and dilute it in 50 mL of analytical pure ethanol, and perform ultraviolet-visible spectroscopy on the sample. The results show that in addition to the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm, vibration peaks belonging to conjugated carbon-carbon double bonds (-C=C-C=C-) or enal structures (-C=C-C=O) appear at 320 nm - 330 nm. It indicates that there are products of aldol condensation and dehydration.

[0076]

Comparative Example 4

[0077] Weigh 10 g of aqueous acetaldehyde solution (mass fraction 40%), and slowly add 12 g of triethylamine until dissolved under stirring. Continuously add 0.2 g of acetic acid to the solution and stir evenly to obtain a comparative stabilizer.

[0078] Performance test of the stabilizer: Add 0.1 mL of the comparative stabilizer to 50.0 mL of liquid acetaldehyde, and stir evenly. Continuously add 1 M NaOH solution dropwise to the liquid acetaldehyde under stirring, and stir evenly. Stop when the added amount reaches 10 mL, transfer the liquid into a clean screw-cap bottle, seal it, and store it away from light. Observe after 100 days, the liquid is brownish. Take 1 μL of this substance and dilute it in 50 mL of analytical pure ethanol, and perform ultraviolet-visible spectroscopy on the sample. The results show that in addition to the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm, vibration peaks belonging to conjugated carbon-carbon double bonds (-C=C-C=C-) or enal structures (-C=C-C=O) appear at 320 nm - 330 nm. It indicates that there are products of aldol condensation and dehydration.

[0079]

Comparative Example 5

[0080] Weigh 10 g of aqueous acetaldehyde solution (mass fraction 40%), and slowly add 12 g of triethylamine until dissolved under stirring. Continuously add 0.2 g of hydrochloric acid (37%) to the solution and stir evenly to obtain a comparative stabilizer.

[0081] Stabilizer performance test: Add 0.1 mL of the comparative stabilizer to 50.0 mL of liquid acetaldehyde and stir evenly. While stirring, continuously add 1 M NaOH solution to the liquid acetaldehyde and stir evenly. Stop when the added amount reaches 10 mL, transfer the liquid into a clean screw-cap bottle, seal it, and store it in the dark. Observe after 100 days, and the liquid is brownish. Take 1 μL of this substance and dilute it in 50 mL of analytical pure ethanol, and conduct ultraviolet-visible spectroscopy test on the sample. The results show that in addition to the signal peaks belonging to the carbonyl group (C=O) at 280 nm - 300 nm, vibration peaks belonging to conjugated carbon-carbon double bonds (-C=C-C=C-) or vibration peaks of enal structure (-C=C-C=O) appear at 320 nm - 330 nm. It shows that there are products of aldol condensation and dehydration.

[0082] For those of ordinary skill in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention.

Claims

1. A metal-free acetaldehyde stabilizer comprising the following components in parts by weight: 100 parts of organic amine and / or ammonium hydroxide; 2-80 parts of organic acid and / or inorganic acid; 5-40 parts of acetaldehyde; 2 to 100 parts of solvent.

2. The acetaldehyde stabilizer according to claim 1, characterized in that The following components are included in parts by weight: 100 parts of organic amine and / or ammonium hydroxide; 5-40 parts of organic acid and / or inorganic acid; 10-35 parts of acetaldehyde; 5 to 80 parts of solvent.

3. The acetaldehyde stabilizer according to claim 1, characterized in that: The organic amine is selected from at least one of aliphatic amines, alcohol amines, amides, alicyclic amines, aromatic amines, and naphthyl amines. Preferably, the organic amine is selected from at least one of methylamine, triethylamine, triethanolamine, urotropine, and aniline.

4. The acetaldehyde stabilizer according to claim 1, characterized in that: Organic or inorganic acids are strong acids; Preferably, the inorganic acid is selected from at least one of hydrochloric acid, nitric acid, sulfuric acid, perchloric acid, metaperiodic acid, perbromic acid, hydrobromic acid, hydroiodic acid, chloric acid, permanganic acid, bromic acid, fluoroboric acid, and fluorosulfonic acid; Preferably, the organic acid is at least one selected from methanesulfonic acid, trifluoromethanesulfonic acid, trifluoroacetic acid, trichloroacetic acid, 2,4,6-trinitrophenol, benzenesulfonic acid, and 2,4,6-trinitrobenzoic acid.

5. The acetaldehyde stabilizer according to claim 1, characterized in that: The solvent is water.

6. The acetaldehyde stabilizer according to claim 1, characterized in that: The pH value of the acetaldehyde stabilizer is 4.0-10.

0.

7. The method for preparing the acetaldehyde stabilizer according to any one of claims 1 to 6, comprising mixing components including organic amine and / or ammonium hydroxide, organic acid and / or inorganic acid, acetaldehyde and a solvent.

8. Use of the acetaldehyde stabilizer according to any one of claims 1 to 6 or the acetaldehyde stabilizer obtained by the preparation method according to claim 7 in the storage of liquid acetaldehyde.

9. The use according to claim 8, characterized in that: The acetaldehyde stabilizer is mixed with liquid acetaldehyde. Preferably, the amount of the acetaldehyde stabilizer is 0.001 to 5 wt % of the liquid acetaldehyde.

10. The use according to claim 9, characterized in that: The dosage of the acetaldehyde stabilizer is 0.02-0.5 wt % of the liquid acetaldehyde.