A cutting synergist for liquefied petroleum gas and a method for preparing the same

Abstract

The application discloses a cutting synergist for liquefied petroleum gas and a preparation method thereof, and belongs to the technical field of cutting synergists. The cutting synergist is prepared by mixing the following components with the mass content: an alkyl ferrocene mixture 5-8%, n-octane 6-10%, ethylene glycol monoethyl ether 8-10%, isooctyl nitrate 10-15%, acetone 15-25%, and 200# solvent oil 25-45%. The application is a high-efficiency energy-saving synergist for cutting liquefied petroleum gas, and the performance of the liquefied petroleum gas after the addition of the synergist can reach and exceed the cutting performance level of the original petroleum gas and acetylene gas, and the liquefied petroleum gas can completely replace acetylene gas, natural gas and pure propane to be used as industrial gas for metal cutting. The product performance exceeds that of natural gas, industrial propane and the same kind of synergists on the market, and has a wide application prospect, and is a great breakthrough of industrial gas in the industrial field of China.

Description

Technical Field

[0001] This invention relates to the field of cutting enhancer technology, and more specifically, to a cutting enhancer for liquefied petroleum gas and its preparation method. Background Technology

[0002] Currently, in the field of metal flame cutting, the traditional oxy-acetylene cutting process is widely used. However, acetylene has significant drawbacks in production and use: high energy consumption and high operating costs; it is prone to slag buildup and nodules during cutting, resulting in rough cut surfaces that are difficult to clean; at the same time, acetylene is flammable and explosive, posing high safety risks, and its combustion process causes serious pollution that can harm the health of operators. Replacing acetylene has become an industry consensus.

[0003] To address the drawbacks of using acetylene, the industry has gradually adopted petroleum gas, propane, natural gas, and other petroleum-based fuels to replace acetylene in welding and cutting operations. However, pure petroleum-based fuels generally suffer from problems such as low flame temperature, long preheating and piercing times, slow cutting speed, and insufficient cutting efficiency, making it difficult to meet the high-efficiency cutting requirements of materials such as thick plates, stainless steel, and high-alloy steel, thus limiting their performance in actual industrial applications.

[0004] To improve the cutting performance of petroleum gas-based fuels, a variety of cutting fuel additives have emerged on the market. While they can improve combustion efficiency to some extent, they still have many technical shortcomings: most additive systems have poor stability and are prone to stratification and precipitation during long-term storage, affecting their performance; some additives contain toxic and harmful components such as xylene, which are not environmentally friendly and safe enough; and existing additives have limited effect on improving flame temperature and calorific value, and cannot fully replace acetylene. They also fail to meet the requirements of high-end industrial cutting in terms of cutting quality, energy efficiency, and applicable material range.

[0005] Therefore, developing a liquefied petroleum gas (LPG) synergist that is highly stable, environmentally friendly and non-toxic, highly efficient in combustion, and significantly energy-saving, can comprehensively improve the cutting performance of LPG, replace acetylene, and is compatible with the cutting of various metal materials, has become an urgent technical problem to be solved in the field of metal cutting gas. Summary of the Invention

[0006] 1. The technical problem that the invention aims to solve

[0007] To address the shortcomings and deficiencies of existing technologies, this invention provides a cutting enhancer for liquefied petroleum gas (LPG) and its preparation method. The gas modified with this enhancer exhibits significantly superior overall safety performance compared to acetylene fuel, avoiding the safety hazards of acetylene's potential explosion. The safety factor is greatly improved throughout the entire process of storage, transportation, and on-site use. Compared to ordinary propane gas, it offers better performance, lower operating costs, and is safer, more reliable, and more versatile. The enhancer combines excellent catalytic combustion and flame optimization properties, promoting complete combustion of the gas, significantly reducing exhaust emissions, and producing combustion without explosions, black smoke, or harmful gas emissions, making it environmentally friendly. It can also significantly improve the cutting speed and finished product quality of steel plates.

[0008] 2. Technical Solution

[0009] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0010] The present invention discloses a cutting enhancer for liquefied petroleum gas, which is composed of a mixture of alkyl ferrocene, n-octane, ethylene glycol monoethyl ether, isooctyl nitrate, acetone and 200# solvent oil. The mass content of each component is as follows: alkyl ferrocene 5-8%, n-octane 6-10%, ethylene glycol monoethyl ether 8-10%, isooctyl nitrate 10-15%, acetone 15-25%, and 200# solvent oil 25-45%.

[0011] Furthermore, the mass content of each component of the cutting enhancer is as follows: 6-8% alkyl ferrocene, 8-10% n-octane, 8-9% ethylene glycol monoethyl ether, 10-12% isooctyl nitrate, 18-20% acetone, and 43-46% 200# solvent oil.

[0012] Furthermore, the alkyl ferrocene mixture is a mixture of 3-tert-butylferrocene and n-octylferrocene in a mass ratio of 1:1.

[0013] Furthermore, the cutting enhancer is used for cutting ordinary carbon steel and high carbon steel, and the amount of the cutting enhancer added to the liquefied petroleum gas cutting fuel is 0.2 to 1.5% of the mass of the liquefied petroleum gas cutting fuel.

[0014] Furthermore, the cutting enhancer is used for cutting alloy steel or 201 and 304 stainless steel with an alloy element content higher than 15%; the amount of the cutting enhancer added to the liquefied petroleum gas cutting fuel is 0.5 to 1.5% of the mass of the liquefied petroleum gas cutting fuel.

[0015] Furthermore, the liquefied petroleum gas is liquefied propane or industrial liquefied petroleum gas with a propane content greater than 95%.

[0016] A method for preparing a cutting enhancer for liquefied petroleum gas:

[0017] First, pour a portion of 200# solvent oil (40% by mass), ethylene glycol monoethyl ether and n-octane into a stirred reactor and stir until homogeneous.

[0018] Then add isooctyl nitrate and acetone to the stirred reactor and stir for 50-90 minutes, then add the alkyl ferrocene mixture and stir for 90-120 minutes.

[0019] Add ethylene glycol monoethyl ether and 200# solvent oil (60% by mass) and stir for 2-4 hours;

[0020] Finally, after standing and aging for 24 to 28 hours, the solution is filtered through a gas-liquid filter. Then, the solution in the reactor is poured into a galvanized iron packaging drum through a metering device, thus producing this type of gas efficiency enhancer.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0023] 1. The gas modified with the enhancer of this invention exhibits significantly better overall safety performance than acetylene fuel, avoiding the safety hazard of acetylene's potential explosion. Furthermore, its safety factor is significantly higher throughout the entire process of storage, transportation, and on-site use. Compared to ordinary propane gas, it offers superior overall performance, lower operating costs, and is safer, more reliable, and more versatile.

[0024] 2. The industrial cutting gas prepared by adding the synergist of this invention can directly save more than 40% of the overall gas cost; at the same time, it can significantly reduce the intensity of manual labor and reduce the workload of subsequent processes such as grinding and trimming of the cutting surface. The actual overall cost reduction of enterprises can reach 30% to 50%.

[0025] 3. This synergist has excellent catalytic combustion and flame optimization effects, which can promote the complete combustion of fuel gas, effectively reduce the emission of pollutants in exhaust gas, and produce no explosions, no black smoke, and no harmful gas emissions during the combustion process, making it green and environmentally friendly.

[0026] 4. Adding this enhancer to liquefied petroleum gas can significantly improve the flame cutting rate and quality of steel plates. The finished product qualification rate can reach over 99% after one cut, which can meet the cutting requirements of various industrial steel plates. The entire process is clean and pollution-free.

[0027] 5. After the addition of this synergist, it can promote the full mutual solubility of the components and activate the main combustion medium, greatly improving the combustion rate and heat release, and the flame temperature can reach 3460℃; compared with ordinary industrial propane, the preheating time for stainless steel piercing is shortened by 40% to 60%, and the cutting speed is increased by 20% to 40%.

[0028] 6. When liquefied petroleum gas mixed with this enhancer is used in cutting operations, the upper edge of the cutting surface is free from undercutting and burn-out defects, and the lower edge is free from slag and lumps, resulting in a smooth and clean cutting surface; effectively reducing steel loss and further saving raw materials and production costs.

[0029] 7. This synergist has a wide range of applications and strong versatility. Relying on its high-temperature and high-efficiency combustion characteristics, it can completely replace propane in conventional working conditions such as flame cutting and mechanical cleaning. At the same time, it can be extended to various industrial processing scenarios such as steel baking, deformation straightening, edge stripping and heat treatment. Detailed Implementation

[0030] The present invention will be further described below with reference to embodiments:

[0031] Example 1

[0032] This embodiment describes a cutting enhancer for liquefied petroleum gas. In cold seasons, its composition by weight is a mixture of alkyl ferrocene, n-octane, ethylene glycol monoethyl ether, isooctyl nitrate, acetone, and 200# solvent oil. The mass content of each component is as follows: alkyl ferrocene 8%, n-octane 10%, ethylene glycol monoethyl ether 9%, isooctyl nitrate 14%, acetone 18%, and 200# solvent oil 41%.

[0033] During the cutting process, the synergist from Example 1 was added to liquid propane in the gas pipeline at a ratio of 10 ml / m3 and mixed. The mixed gas was then used to cut steel indoors, and the indoor air quality was tested.

[0034] During the cutting process, the indoor concentrations of sulfur dioxide, nitrogen dioxide, carbon monoxide, and carbon dioxide were 0.02 mg / m³, 0.15 mg / m³, 1.05 mg / m³, and 0.050%, respectively, which were lower than the national "Indoor Air Quality Standards" of 0.50 mg / m³, 0.24 mg / m³, 10 mg / m³, and 0.079%.

[0035] Example 2

[0036] This embodiment describes a cutting enhancer for liquefied petroleum gas. In hot seasons, its composition by mass ratio is a mixture of alkyl ferrocene, n-octane, ethylene glycol monoethyl ether, isooctyl nitrate, acetone, and 200# solvent oil. The mass content of each component is as follows: alkyl ferrocene 7%, n-octane 7%, ethylene glycol monoethyl ether 10%, isooctyl nitrate 12%, acetone 20%, and 200# solvent oil 44%.

[0037] The explosion limits of the synergists in various embodiments of the present invention after being added to liquefied petroleum gas with air and oxygen:

[0038]

[0039] The synergists from Examples 1 and 2 were added to liquefied petroleum gas (98% propane content) at a mass ratio of 1%, and after thorough mixing, they were used as the gas for cutting steel. Their performance was tested and compared with acetylene.

[0040] Comparison of performance of gas and acetylene gas in fuel gas: (each calculated as three times with an overall average value);

[0041]

[0042] During the cutting process, the synergists from Examples 1 and 2 were added to natural gas in the gas pipeline at a ratio of 10 ml / m3 and mixed. The mixed gas was then used to cut steel, and its performance was tested. The results were compared with pure natural gas without the synergist.

[0043] Performance comparison of natural gas before and after adding the synergist of this invention: (three tests were taken for each test, and the overall average value was calculated)

[0044]

[0045] Example 3

[0046] This embodiment describes a method for preparing a cutting enhancer for liquefied petroleum gas:

[0047] First, pour a portion of 200# solvent oil (40% by mass), ethylene glycol monoethyl ether and n-octane into a stirred reactor and stir until homogeneous.

[0048] Then add isooctyl nitrate and acetone to the stirred reactor and stir for 60 minutes, then add the alkyl ferrocene mixture and stir for 100 minutes.

[0049] Add ethylene glycol monoethyl ether and 200# solvent oil (60% by mass) and stir for 3 hours;

[0050] Finally, after standing and aging for 24 hours, the solution is filtered through a gas-liquid filter and then poured into a galvanized iron packaging drum through a metering device, thus producing this type of gas efficiency enhancer.

[0051] It can be filled into industrial gas cylinders using a manual booster pump or an automatic metering device, or filled into liquefied petroleum gas tanks at a ratio of 0.5 to 1.5% using a metering pump to produce mixed industrial fuel gas. Alternatively, during cutting, 10-15 ml of fuel gas can be added to the gas pipeline or petroleum gasification device at a ratio of 1 cubic meter to mix.

[0052] This synergist can also be made up of other components, or it can be made up of only alkyl ferrocene mixture, n-octane, ethylene glycol monoethyl ether, isooctyl nitrate, acetone and 200# solvent oil. When it is made up of only the existing components, the sum of each component in the above formulations is 100%.

[0053] The cutting enhancer is used for cutting ordinary carbon steel and high carbon steel. The amount of the cutting enhancer added to the liquefied petroleum gas cutting fuel is 0.2 to 1.5% of the mass of the liquefied petroleum gas cutting fuel.

[0054] The cutting enhancer is used for cutting alloy steel or 201 and 304 stainless steel with an alloy element content higher than 15%; the amount of the cutting enhancer added to the liquefied petroleum gas cutting fuel is 0.5 to 1.5% of the mass of the liquefied petroleum gas cutting fuel.

[0055] Liquefied petroleum gas is liquefied propane or industrial liquefied petroleum gas with a propane content of more than 95%.

[0056] Liquefied petroleum gas (LPG) cutting fuel refers to cutting fuel extracted or processed from petroleum, including but not limited to LPG (whose main components are propane, acetylene, propylene, butane, butene, etc., with a combustion temperature of around 2800℃ in oxygen, making it an ideal fuel for welding and cutting operations), natural gas, propane, propylene, diesel fuel, gasoline, or diesel fuel. Adding this enhancer to propane cutting fuel can increase the calorific value of the LPG gas enhancer to over 25500 Kcal / m³, and the flame temperature to reach 3460℃.

[0057] The alkyl ferrocene propane mixture in this synergist is an organometallic compound, belonging to a type of high-efficiency flame agent and accelerator. With the synergistic effect of co-solvents and other components, when added to liquefied petroleum gas (LPG) flame cutting and mixed with it, it exhibits a catalytic effect during combustion, altering the combustion chain reaction kinetics, increasing free radical generation efficiency, and thus significantly improving flame combustion speed and temperature. Simultaneously, it reduces fuel consumption, increases flame cutting efficiency, and can substantially reduce the kerf width and improve the quality of the flame cut surface. Synergistic effects with other synergists allow various organic components to combine and interact, also providing heating and preventing precipitation. The 200# solvent oil also has a solubilizing effect under the influence of the various components. When added to LPG flame cutting, it can completely replace propane, making it a novel synergist that can be widely added to LPG for flame cutting, characterized by safety, environmental friendliness, energy saving, and high efficiency. It represents a breakthrough in liquefied petroleum gas synergists, with a calorific value of 25,500 Kcal / m³ and a flame temperature of 3,460℃. This synergist can be applied in numerous steel mills, shipyards, and the machinery industry.

[0058] This invention discloses a high-efficiency and energy-saving additive for liquefied petroleum gas (LPG) cutting fuel. The modified LPG has a comprehensive performance in steel flame cutting that is superior to that of ordinary LPG and acetylene, and can completely replace acetylene and ordinary LPG as a dedicated industrial fuel for metal cutting.

[0059] This performance enhancer has been piloted in several shipyards, steel structure companies, and other industrial settings, and its effectiveness has been widely recognized by the industry. Its overall performance far surpasses that of natural gas, industrial propane, and other similar gas performance enhancers on the market. It boasts significant energy-saving, efficiency-enhancing, and cutting advantages, is suitable for a wide range of applications, and has a very promising market prospect. Furthermore, it represents a significant technological breakthrough for the transformation, upgrading, and green substitution of the domestic industrial gas sector.

[0060] The present invention and its embodiments have been described above illustratively, and this description is not restrictive; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A cutting enhancement agent for liquefied petroleum gas, characterized in that: Its composition is a mixture of alkyl ferrocene, n-octane, ethylene glycol monoethyl ether, isooctyl nitrate, acetone and 200# solvent oil. The mass content of each component is as follows: alkyl ferrocene 5-8%, n-octane 6-10%, ethylene glycol monoethyl ether 8-10%, isooctyl nitrate 10-15%, acetone 15-25%, and 200# solvent oil 25-45%.

2. The cutting enhancement agent for liquefied petroleum gas according to claim 1, characterized in that: The mass content of each component of the cutting enhancer is as follows: 6-8% alkyl ferrocene, 8-10% n-octane, 8-9% ethylene glycol monoethyl ether, 10-12% isooctyl nitrate, 18-20% acetone, and 43-46% 200# solvent oil.

3. The cutting enhancement agent for liquefied petroleum gas according to claim 1, characterized in that: The alkyl ferrocene mixture is a mixture of 3-tert-butylferrocene and n-octylferrocene in a mass ratio of 1:

1.

4. The cutting enhancement agent for liquefied petroleum gas according to claim 1, characterized in that: The cutting enhancer is used for cutting ordinary carbon steel and high carbon steel. The amount of the cutting enhancer added to the liquefied petroleum gas cutting fuel is 0.2 to 1.5% of the mass of the liquefied petroleum gas cutting fuel.

5. The cutting enhancement agent for liquefied petroleum gas according to claim 1, characterized in that: The cutting enhancer is used for cutting alloy steel or 201 and 304 stainless steel with an alloy element content higher than 15%; the amount of the cutting enhancer added to the liquefied petroleum gas cutting fuel is 0.5 to 1.5% of the mass of the liquefied petroleum gas cutting fuel.

6. The cutting enhancement agent for liquefied petroleum gas according to claim 1, characterized in that: The liquefied petroleum gas mentioned is liquefied propane or industrial liquefied petroleum gas with a propane content of more than 95%.

7. The method for preparing a cutting enhancer for liquefied petroleum gas according to claim 1, characterized in that: First, pour a portion of 200# solvent oil (40% by mass), ethylene glycol monoethyl ether and n-octane into a stirred reactor and stir until homogeneous. Then add isooctyl nitrate and acetone to the stirred reactor and stir for 50-90 minutes, then add the alkyl ferrocene mixture and stir for 90-120 minutes. Add ethylene glycol monoethyl ether and 200# solvent oil (60% by mass) and stir for 2-4 hours; Finally, after standing and aging for 24 to 28 hours, the solution is filtered through a gas-liquid filter. Then, the solution in the reactor is poured into a galvanized iron packaging drum through a metering device, thus producing this type of gas efficiency enhancer.

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