Natural gas gain agent and preparation method thereof

Abstract

The invention relates to the technical field of fuel additives, and discloses a natural gas gain agent and a preparation method thereof, the natural gas gain agent comprises the following components by mass: 5-15 parts of an organic metal compound, 10-20 parts of dimethyl carbonate, 10-20 parts of ethylene glycol monobutyl ether, 1-5 parts of a nano catalyst, 2-8 parts of a stabilizer and 30-60 parts of a solvent. The organic metal compound, the dimethyl carbonate and the ethylene glycol monobutyl ether are adopted as a catalytic system, efficient gain is achieved, incomplete combustion products can be reduced, and emission of toxic gas is reduced; the oxygen-containing compound is adopted as an oxygen supply system to overcome the defect that the oxygen content of natural gas is insufficient, combustion is more sufficient, and pollution gas obtained through insufficient combustion is reduced; the stabilizer can stabilize the catalytic activity of metal ions and reduce pollution gas caused by deactivation of the catalyst, further, the solvent adopted by the invention can reduce volatilization of organic matters, and the safety and practicability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel additives, and in particular to a natural gas enhancer and a preparation method thereof. Background Art

[0002] Natural gas, a vital clean energy source, has a combustion heat of approximately 890 kJ / mol. However, in practice, its thermal energy utilization is low due to issues such as incomplete combustion and limited flame propagation speed. Traditional methods for enhancing natural gas efficiency include physical modification (such as high-pressure compression and oxygen-enriched combustion) and chemical additives. However, physical methods are energy-intensive and require complex equipment, while chemical additives pose challenges such as poor stability, high corrosiveness, and high costs.

[0003] For example, while certain metal salt additives used in existing technologies (such as copper nitrate and potassium permanganate) can increase combustion temperatures to a certain extent, they can easily form metal oxide particles during combustion, causing pipe blockage and equipment wear. Furthermore, some organic additives (such as ethers and alcohols) are volatile and have low flash points, posing safety risks and having limited potential to improve natural gas efficiency.

[0004] As global demands for environmental protection and energy efficiency become increasingly stringent, traditional, highly polluting, and inefficient fuel efficiency enhancement technologies are gradually being phased out. For example, the EU's "Ecodesign Directive on Energy-Related Products" (ErP Directive) and China's "Air Pollution Prevention and Control Action Plan" have set clear limits on post-combustion emissions, necessitating the development of highly efficient and environmentally friendly natural gas enhancers.

[0005] Based on this, providing a high-efficiency and environmentally friendly natural gas enhancer has important practical significance. Summary of the Invention

[0006] In view of this, the present invention proposes a natural gas enhancer and a preparation method thereof, aiming to solve at least one of the above-mentioned background technologies.

[0007] The present invention provides a natural gas enhancer, characterized by comprising the following components in parts by mass:

[0008] 5-15 parts of organic metal compound, 10-20 parts of dimethyl carbonate, 10-20 parts of ethylene glycol monobutyl ether, 1-5 parts of nano catalyst, 2-8 parts of stabilizer and 30-60 parts of solvent.

[0009] Preferably, the organometallic compound includes methylferrocene, ethylferrocene and cobalt naphthenate in a mass ratio of 1:1:1.

[0010] Preferably, the nanocatalyst is nano zirconium dioxide and nano cerium dioxide, and the mass ratio thereof is 2:1.

[0011] Preferably, the stabilizer is benzotriazole and tert-butylhydroquinone, and the mass ratio thereof is 1 to 2:1.

[0012] Preferably, the solvent is isooctane and cyclohexane in a mass ratio of 2 to 3:1.

[0013] The present invention also provides a method for preparing the natural gas enhancement agent described in the above technical solution, comprising the following steps:

[0014] pretreating the nanocatalyst to obtain a nanocatalyst suspension;

[0015] preparing an organometallic compound solution;

[0016] Mixing dimethyl carbonate, ethylene glycol monobutyl ether, an organic metal compound solution and a nanocatalyst suspension, heating and stirring to obtain a first mixed solution;

[0017] adding a stabilizer to the first mixed solution, cooling and stirring, to obtain a second mixed solution;

[0018] The second mixed liquid is filtered to obtain the natural gas enhancement agent.

[0019] Preferably, the pretreatment is specifically: heating the nanocatalyst under a nitrogen atmosphere, cooling it, and then mixing it with polyvinyl pyrrolidone to obtain a nanocatalyst suspension, wherein the heating temperature is 300-400°C.

[0020] Preferably, the mixing method is ultrasonic dispersion, and the parameters of the ultrasonic dispersion are: power 200-500W, frequency 20-40kHz, and time 15-30 minutes.

[0021] Preferably, the temperature of the heating and stirring is 70-80°C, and the time is 2 hours; the temperature of the cooling and stirring is 40-50°C, and the time is 30 minutes.

[0022] The present invention also provides the use of the natural gas enhancement agent described in the above technical solution in natural gas combustion.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention uses an organometallic compound, dimethyl carbonate and ethylene glycol monobutyl ether as a catalytic system, which has high efficiency and can reduce incomplete combustion products and toxic gas emissions. The oxygen-containing compound used in the present invention as an oxygen supply system compensates for the defect of insufficient oxygen content in natural gas, makes combustion more complete, and reduces pollutant gases generated by incomplete combustion. The stabilizer can stabilize the catalytic activity of metal ions and reduce pollutant gases caused by catalyst deactivation. Furthermore, the solvent used in the present invention can reduce the volatilization of organic matter and improve safety and practicality. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present invention are now described in detail. This detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention. It should be understood that the terms used in the present invention are only for describing specific embodiments and are not intended to limit the present invention.

[0026] In addition, for numerical ranges in the present invention, it is understood that each intervening value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any stated value or intervening value in a stated range and any other stated value or intervening value in the stated range is also included in the present invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.

[0027] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of any conflict with any incorporated document, the contents of this specification shall prevail.

[0028] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from the description of the invention. The description and examples are intended to be exemplary only.

[0029] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0030] The present invention provides a natural gas enhancement agent, characterized by comprising the following components in parts by mass:

[0031] 5-15 parts of organic metal compound, 10-20 parts of dimethyl carbonate, 10-20 parts of ethylene glycol monobutyl ether, 1-5 parts of nano catalyst, 2-8 parts of stabilizer and 30-60 parts of solvent.

[0032] The components in parts by mass are preferably: 5-10 parts of organometallic compound, 10-15 parts of dimethyl carbonate, 10-15 parts of ethylene glycol monobutyl ether, 1-3 parts of nanocatalyst, 2-4 parts of stabilizer and 30-40 parts of solvent.

[0033] In the present invention, the organometallic compound preferably includes methylferrocene, ethylferrocene and cobalt naphthenate, and the mass ratio thereof is 1:1:1.

[0034] The present invention adds methylferrocene, ethylferrocene and cobalt naphthenate, wherein methylferrocene and ethylferrocene decompose at high temperature to produce iron atoms, which adsorb methane molecules as catalytic active centers, reduce their cracking activation energy, and make methane decompose to produce methyl radicals and hydrogen radicals, triggering a combustion chain reaction, and the rapid generation of free radicals can improve the combustion reaction rate and directly increase the flame temperature. Ethylferrocene and methylferrocene form a synergistic catalytic effect, and the ethyl chain in its molecular structure can enhance the compatibility with the organic phase, while extending the service life of the iron active center (not easy to agglomerate and deactivate at high temperature), so that the catalyst remains active during the entire combustion process and avoids temperature drops; the cobalt ions in cobalt naphthenate can activate oxygen molecules, generate highly active superoxide radicals, accelerate oxidation reactions: superoxide radicals can efficiently oxidize incomplete combustion products, reduce black smoke generation, and release additional heat, so that the combustion temperature is further improved. The present invention specifically limits its mass ratio, balances catalytic activity and stability, and iron-based catalytic cracking and cobalt-based oxidation promote the formation of a "double cycle", so that the combustion temperature improvement amplitude is higher than that of a single metal compound.

[0035] In the present invention, the nanocatalyst is preferably nano zirconium dioxide and nano ceria, with a mass ratio of 2:1.

[0036] The present invention also adds a nano catalyst. The nano catalyst of the present invention has a small particle size. There are a large number of oxygen vacancies on the surface of nano zirconium dioxide, which can adsorb and activate methane molecules, reduce the cracking energy, and make methane molecules begin to crack at low temperature. At the same time, it can resist the high temperature of combustion and avoid sintering and deactivation of the catalyst. Nano cerium dioxide has a unique oxygen storage-release ability. 4+ With Ce 3+ The redox cycle dynamically regulates the oxygen concentration. The 2:1 ratio of nano-zirconium dioxide and nano-cerium dioxide can balance the functions of "activating methane" and "regulating oxygen concentration". The high stability of ZrO2 provides a supporting skeleton for CeO2, preventing its high-temperature agglomeration, and extending the overall life of the catalyst to more than twice that of traditional catalysts.

[0037] In the present invention, the stabilizer is preferably benzotriazole and tert-butylhydroquinone, and the mass ratio thereof is preferably 1-2:1.

[0038] The triazole ring in the benzotriazole molecule can react with metal ions (Fe 3+ 、Co 2+ ) to form a stable chelate to prevent it from hydrolyzing and forming hydroxide precipitation during storage (avoiding stratification and discoloration of the enhancer); tert-butylhydroquinone, by capturing free radicals (such as O2· -, ROO·) terminates the oxidation chain reaction, inhibiting the auto-oxidative deterioration of oxygenated compounds, extending the shelf life of the enhancer while preventing corrosion of metal pipes by oxidation products (such as carboxylic acids). Their 1-2:1 ratio balances metal ion stability and antioxidant requirements. Benzotriazole preferentially chelates metal ions, while tert-butylhydroquinone focuses on antioxidant activity in the organic phase. The combination of these two ensures the enhancer remains clear and transparent even after 30 days of storage at 60°C, whereas traditional additives would stratify under these conditions.

[0039] In the present invention, the solvent is preferably isooctane and cyclohexane, and the mass ratio thereof is 2 to 3:1.

[0040] Isooctane can reduce the volatility of the enhancer, avoiding concentration changes due to component volatilization during storage. At the same time, its non-polar structure can stably dissolve organometallic compounds (such as ferrocene derivatives) and prevent crystallization. The cycloalkane structure can reduce the surface tension of the solvent, enhance the miscibility of the enhancer with natural gas, and make the natural gas flame more evenly distributed after addition, avoiding localized high or low temperatures. In addition, cyclohexane has a higher flash point than traditional solvents, improving storage safety. The two have excellent synergistic effects. The ratio of 2 to 3:1 can balance "low volatility" and "high miscibility". Isooctane ensures stability, and cyclohexane optimizes dispersibility, allowing the enhancer to maintain a uniform liquid phase in the range of -20°C to 60°C.

[0041] The dimethyl carbonate and ethylene glycol monobutyl ether in the present invention serve as oxygen-containing compounds to supplement oxygen sources, decompose and release active oxygen atoms during the combustion and decomposition process, thereby compensating for the deficiency of insufficient oxygen content in natural gas and making methane burn more fully.

[0042] Specifically, dimethyl carbonate contains 53% oxygen, far exceeding that of traditional oxygenated fuels such as ethanol. During combustion, it decomposes to release reactive oxygen atoms (O*), compensating for the oxygen deficiency in natural gas and bringing methane combustion closer to theoretical completeness. Ethylene glycol monobutyl ether (EGBE) serves both solubility and combustion-supporting functions. The ether bonds (-O-) and hydroxyl groups (-OH) in the molecule reduce the interfacial tension between the enhancer and natural gas, ensuring uniform dispersion of the components and preventing stratification, thus resolving the problem of poor solubility between traditional additives and natural gas. Decomposition at high temperatures produces alkoxy radicals (RO·), which further trigger methane cracking. This, combined with the catalytic action of the organometallic compound, increases the flame propagation speed. A 1:1 mixture of the two ensures a sufficient oxygen source while optimizing the physical compatibility of the enhancer, maintaining a stable combustion temperature above 2300°C.

[0043] The present invention adopts organic metal compounds and nanocatalysts as catalytic systems, oxygen-containing compounds as oxygen supply systems, stabilizers as stabilizing systems, and solvents as dispersing systems. The four systems work synergistically to achieve high efficiency gains.

[0044] The present invention also provides a method for preparing the natural gas enhancement agent described in the above technical solution, comprising the following steps:

[0045] pretreating the nanocatalyst to obtain a nanocatalyst suspension;

[0046] preparing an organometallic compound solution;

[0047] Mixing dimethyl carbonate, ethylene glycol monobutyl ether, an organic metal compound solution and a nanocatalyst suspension, heating and stirring to obtain a first mixed solution;

[0048] adding a stabilizer to the first mixed solution, cooling and stirring, to obtain a second mixed solution;

[0049] The second mixed liquid is filtered to obtain the natural gas enhancement agent.

[0050] In the present invention, the pretreatment is preferably as follows: heating the nanocatalyst under a nitrogen atmosphere, cooling it, and then mixing it with polyvinyl pyrrolidone to obtain a nanocatalyst suspension, wherein the heating temperature is 300-400°C.

[0051] The method for preparing the organometallic compound solution of the present invention specifically comprises: mixing the organometallic compound with a solvent to obtain the organometallic compound solution. The preparation conditions are not particularly limited.

[0052] In the present invention, the mixing method is preferably ultrasonic dispersion, and the parameters of the ultrasonic dispersion are preferably: power 200-500W, frequency 20-40kHz, time 15-30 minutes, more preferably: power 200-300W, frequency 20-30kHz, time 15-20 minutes.

[0053] In the present invention, the temperature of the heating and stirring is preferably 70-80° C., and the time is preferably 2 hours; the temperature of the cooling and stirring is preferably 40-50° C., and the time is preferably 30 minutes.

[0054] The present invention also provides the use of the natural gas enhancement agent described in the above technical solution in natural gas combustion.

[0055] Example 1

[0056] (1) Two parts of nano-zirconium dioxide and one part of nano-cerium dioxide were mixed as nano-catalysts, heated under a nitrogen atmosphere at a temperature of 300° C. for two hours, cooled, and mixed with polyvinyl pyrrolidone, and the mixing method was ultrasonic dispersion at a power of 200 W and a frequency of 20 kHz for 15 minutes to obtain a nano-catalyst suspension;

[0057] (2) mixing 5 parts of an organometallic compound with 30 parts of a solvent to obtain an organometallic compound solution; wherein the organometallic compound is a mixture of methylferrocene, ethylferrocene, and cobalt cyclohexane in a mass ratio of 1:1:1; and the solvent is a mixture of isooctane and cyclohexane in a mass ratio of 2:1;

[0058] (3) mixing 10 parts of dimethyl carbonate, 10 parts of ethylene glycol monobutyl ether, the organic metal compound solution and the nanocatalyst suspension, heating and stirring at 70° C. for 2 hours to obtain a first mixed solution;

[0059] (4) adding two portions of a stabilizer to the first mixed solution, cooling and stirring at 40° C. for 30 minutes to obtain a second mixed solution; the stabilizer is obtained by mixing benzotriazole and tert-butylhydroquinone in a mass ratio of 2:1;

[0060] (5) The second mixed solution is filtered, and then packed with nitrogen to obtain the natural gas enhancer.

[0061] Example 2

[0062] (1) heating two portions of nanocatalysts at 300° C. for two hours under a nitrogen atmosphere, cooling the mixture, and mixing the mixture with polyvinyl pyrrolidone by ultrasonic dispersion at a power of 200 W and a frequency of 20 kHz for 15 minutes to obtain a nanocatalyst suspension; the nanocatalysts are obtained by mixing nanozirconium dioxide and nanocerium dioxide in a mass ratio of 2:1;

[0063] (2) mixing 10 parts of an organometallic compound with 40 parts of a solvent to obtain an organometallic compound solution; wherein the organometallic compound is a mixture of methylferrocene, ethylferrocene, and cobalt naphthenate in a mass ratio of 1:1:1; and the solvent is a mixture of isooctane and cyclohexane in a mass ratio of 2:1;

[0064] (3) mixing 15 parts of dimethyl carbonate, 15 parts of ethylene glycol monobutyl ether, the organic metal compound solution, and the nanocatalyst suspension, heating and stirring at 80° C. for 2 hours to obtain a first mixed solution;

[0065] (4) adding four parts of a stabilizer to the first mixed solution, cooling and stirring at 40° C. for 30 minutes to obtain a second mixed solution; the stabilizer is obtained by mixing benzotriazole and tert-butylhydroquinone in a mass ratio of 2:1;

[0066] (5) The second mixed solution is filtered, and then packed with nitrogen to obtain the natural gas enhancer.

[0067] Example 3

[0068] (1) heating 5 parts of a nanocatalyst at 300° C. for two hours under a nitrogen atmosphere, cooling the nanocatalyst and mixing it with polyvinyl pyrrolidone by ultrasonic dispersion at a power of 200 W and a frequency of 20 kHz for 15 minutes to obtain a nanocatalyst suspension; the nanocatalyst is obtained by mixing nanozirconium dioxide and nanocerium dioxide in a mass ratio of 2:1;

[0069] (2) mixing 15 parts of an organometallic compound with 60 parts of a solvent to obtain an organometallic compound solution; wherein the organometallic compound is a mixture of methylferrocene, ethylferrocene, and cobalt naphthenate in a mass ratio of 1:1:1; and the solvent is a mixture of isooctane and cyclohexane in a mass ratio of 2:1;

[0070] (3) mixing 20 parts of dimethyl carbonate, 20 parts of ethylene glycol monobutyl ether, the organic metal compound solution and the nanocatalyst suspension, heating and stirring at 80° C. for 2 hours to obtain a first mixed solution;

[0071] (4) adding two portions of a stabilizer to the first mixed solution, cooling and stirring at 40° C. for 30 minutes to obtain a second mixed solution; the stabilizer is obtained by mixing benzotriazole and tert-butylhydroquinone in a mass ratio of 2:1;

[0072] (5) The second mixed solution is filtered, and then packed with nitrogen to obtain the natural gas enhancer.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A natural gas enhancer, characterized in that: The composition includes the following parts by weight: 5-15 parts of organic metal compound, 10-20 parts of dimethyl carbonate, 10-20 parts of ethylene glycol monobutyl ether, 1-5 parts of nano catalyst, 2-8 parts of stabilizer and 30-60 parts of solvent.

2. The natural gas enhancer according to claim 1, characterized in that: The organometallic compound includes methylferrocene, ethylferrocene and cobalt naphthenate, and the mass ratio thereof is 1:1:

1.

3. The natural gas enhancer according to claim 1, characterized in that: The nano catalyst is nano zirconium dioxide and nano cerium dioxide, and the mass ratio thereof is 2:

1.

4. The natural gas enhancer according to claim 1, characterized in that: The stabilizer is benzotriazole and tert-butylhydroquinone, and the mass ratio thereof is 1-2:

1.

5. The natural gas enhancer according to claim 1, characterized in that: The solvent is isooctane and cyclohexane, and the mass ratio thereof is 2 to 3:

1.

6. A method for preparing the natural gas enhancer according to any one of claims 1 to 5, characterized in that: The following steps are involved: pretreating the nanocatalyst to obtain a nanocatalyst suspension; preparing an organometallic compound solution; Mixing dimethyl carbonate, ethylene glycol monobutyl ether, an organic metal compound solution and a nanocatalyst suspension, heating and stirring to obtain a first mixed solution; adding a stabilizer to the first mixed solution, cooling and stirring, to obtain a second mixed solution; The second mixed liquid is filtered to obtain the natural gas enhancement agent.

7. The method for preparing the natural gas enhancement agent according to claim 6, characterized in that: The pretreatment specifically comprises: heating the nanocatalyst in a nitrogen atmosphere, cooling the nanocatalyst, and mixing the nanocatalyst with polyvinyl pyrrolidone to obtain a nanocatalyst suspension, wherein the heating temperature is 300-400°C.

8. The method for preparing the natural gas enhancement agent according to claim 6, characterized in that The mixing method is ultrasonic dispersion, and the parameters of the ultrasonic dispersion are: power 200-500W, frequency 20-40kHz, and time 15-30 minutes.

9. The method for preparing the natural gas enhancement agent according to claim 6, characterized in that: The temperature of the heating and stirring is 70-80°C, and the time is 2 hours; the temperature of the cooling and stirring is 40-50°C, and the time is 30 minutes.

10. Use of the natural gas enhancer according to any one of claims 1 to 5 in natural gas combustion.