Natural gas additive and preparation method thereof

Abstract

The present invention relates to a natural gas additive and a preparation method thereof, and belongs to the technical field of fuel gain agents, the natural gas additive comprises, by weight, 70-80% of n-pentane, 4-6% of thiophane, 3-5% of 2, 3-dimethyl butane, 6-10% of methanol, 2-3% of isopropanol, 1-2% of methyl tert-butyl ether, 3-5% of xylene, 0.012-0.018% of cerium stearate, 0.004-0.006% of lanthanum citrate, and 0.38-0.58% of ferrocene. When the natural gas additive is added into natural gas, the cutting efficiency can be improved, gas combustion chemical reaction in unit time and unit space can be accelerated, released energy is increased dramatically, and complete combustion of gas is promoted, so that the flame temperature is greatly increased, and slag is reduced.

Description

Technical Field

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

[0002] Fuel gas is generally used for gas welding and cutting. As an environmentally friendly fuel gas, natural gas has a combustion temperature below 3000℃ in oxygen and cannot be used as an ideal cutting gas. Rare earth enhancers for fuel gas have been widely used in propane gas, natural gas, coalbed methane, liquefied petroleum gas, biogas and other fuel gases. By properly adjusting its ratio for different fuel gases, it can play a good catalytic activation function and make the gas flame temperature exceed 3000℃, or even higher than the temperature of oxyacetylene flame. Rare earth enhancers can completely achieve the effect of replacing acetylene gas with general fuel gas in industry.

[0003] However, the existing natural gas welding and cutting effects are not ideal. It is very necessary to study and select appropriate rare earth compounds, supplemented with transition metal organic catalytic combustion aids such as carbonyl compounds, determine the best coordination experimentally based on the composition characteristics of the fuel matrix, and synthesize efficient fuel additives. Summary of the invention

[0004] The present invention aims to provide a natural gas additive and a preparation method thereof, so as to increase the combustion temperature of natural gas and enhance the welding and cutting effect of natural gas.

[0005] The technical solution adopted by the present invention to achieve its purpose is as follows:

[0006] A natural gas additive comprises, by weight percentage, 70-80% of n-pentane, 4-6% of tetrahydrothiophene, 3-5% of 2,3-dimethylbutane, 6-10% of methanol, 2-3% of isopropanol, 1-2% of methyl tert-butyl ether, 3-5% of xylene, 0.012-0.018% of cerium stearate, 0.004-0.006% of lanthanum citrate, and 0.38-0.58% of ferrocene.

[0007] Preferably, the weight ratio of cerium stearate, lanthanum citrate and ferrocene is 3:1:96.

[0008] A method for preparing a natural gas additive comprises the following steps:

[0009] (1) preparing, by weight percentage, 70-80% of n-pentane, 4-6% of tetrahydrothiophene, 3-5% of 2,3-dimethylbutane, 6-10% of methanol, 2-3% of isopropanol, 1-2% of methyl tert-butyl ether, 3-5% of xylene, 0.012-0.018% of cerium stearate, 0.004-0.006% of lanthanum citrate, and 0.38-0.58% of ferrocene;

[0010] (2) mixing cerium stearate, lanthanum citrate and ferrocene in proportion, dissolving the mixture in a mixed solution of methanol and isopropanol, and stirring the mixture at 30-50° C. for 1-1.5 h to obtain a premixed solution;

[0011] (3) The premixed liquid obtained in step (2) is mixed with tetrahydrothiophene, and then n-pentane, 2,3-dimethylbutane, methyl tert-butyl ether and xylene are added thereto in sequence, and the mixture is stirred for 50-60 minutes, and then allowed to stand for 1.5-2 hours, and a clarified liquid is obtained to obtain a natural gas additive.

[0012] Preferably, in step (1), by weight percentage, 75% of n-pentane, 5% of tetrahydrothiophene, 4% of 2,3-dimethylbutane, 8.5% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 4% of xylene, 0.015% of cerium stearate, 0.005% of lanthanum citrate, and 0.48% of ferrocene are prepared.

[0013] Preferably, in step (2), the mixture is stirred and mixed at 40° C. for 1.5 h.

[0014] Preferably, in step (3), the mixture is stirred for 60 minutes and then allowed to stand for 2 hours.

[0015] The beneficial effects of the present invention are:

[0016] The natural gas additive of the present invention is added to natural gas to improve cutting efficiency, accelerate the chemical reaction of gas combustion per unit time and per unit space, increase the released energy dramatically, promote complete combustion of gas, thereby greatly increasing flame temperature and reducing slag.

[0017] By adding the natural gas additive of the present invention to natural gas for gas welding and cutting, fuel gas can be saved and the burning time can be extended. Meanwhile, the welding and cutting incisions of the workpieces are smooth and free of slag, and there is no backfire or explosion during the cutting process, and the fuel is burned completely. DETAILED DESCRIPTION

[0018] The present invention is described in detail below in conjunction with specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should belong to the scope of protection of the present invention.

[0019] Example 1

[0020] A natural gas additive comprises, by weight percentage, 75% of n-pentane, 5% of tetrahydrothiophene, 4% of 2,3-dimethylbutane, 8.5% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 4% of xylene, 0.015% of cerium stearate, 0.005% of lanthanum citrate, and 0.48% of ferrocene.

[0021] A method for preparing a natural gas additive comprises the following steps:

[0022] (1) Prepare, by weight percentage, 75% of n-pentane, 5% of tetrahydrothiophene, 4% of 2,3-dimethylbutane, 8.5% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 4% of xylene, 0.015% of cerium stearate, 0.005% of lanthanum citrate, and 0.48% of ferrocene;

[0023] (2) cerium stearate, lanthanum citrate, and ferrocene were mixed in proportion, dissolved in a mixed solution of methanol and isopropanol, and stirred at 40° C. for 1.5 h to obtain a premixed solution;

[0024] (3) The premixed liquid obtained in step (2) is mixed with tetrahydrothiophene, and then n-pentane, 2,3-dimethylbutane, methyl tert-butyl ether and xylene are added thereto in sequence, the mixture is stirred for 60 minutes, and then allowed to stand for 2 hours, and a clarified liquid is obtained to obtain a natural gas additive.

[0025] Example 2

[0026] A natural gas additive comprises, by weight percentage, 70% of n-pentane, 4.6% of tetrahydrothiophene, 5% of 2,3-dimethylbutane, 10% of methanol, 3% of isopropanol, 2% of methyl tert-butyl ether, 5% of xylene, 0.012% of cerium stearate, 0.004% of lanthanum citrate, and 0.384% of ferrocene.

[0027] A method for preparing a natural gas additive comprises the following steps:

[0028] (1) Prepare, by weight percentage, 70% of n-pentane, 4.6% of tetrahydrothiophene, 5% of 2,3-dimethylbutane, 10% of methanol, 3% of isopropanol, 2% of methyl tert-butyl ether, 5% of xylene, 0.012% of cerium stearate, 0.004% of lanthanum citrate, and 0.384% of ferrocene;

[0029] (2) cerium stearate, lanthanum citrate, and ferrocene were mixed in proportion, dissolved in a mixed solution of methanol and isopropanol, and stirred at 30° C. for 1.5 h to obtain a premixed solution;

[0030] (3) The premixed liquid obtained in step (2) is mixed with tetrahydrothiophene, and then n-pentane, 2,3-dimethylbutane, methyl tert-butyl ether and xylene are added thereto in sequence, and the mixture is stirred for 50 minutes, and then allowed to stand for 2 hours, and a clarified liquid is obtained to obtain a natural gas additive.

[0031] Example 3

[0032] A natural gas additive comprises, by weight percentage, 80% of n-pentane, 4.4% of tetrahydrothiophene, 3% of 2,3-dimethylbutane, 6% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 3% of xylene, 0.018% of cerium stearate, 0.006% of lanthanum citrate, and 0.576% of ferrocene.

[0033] A method for preparing a natural gas additive comprises the following steps:

[0034] (1) Prepare, by weight percentage, 80% of n-pentane, 4.4% of tetrahydrothiophene, 3% of 2,3-dimethylbutane, 6% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 3% of xylene, 0.018% of cerium stearate, 0.006% of lanthanum citrate, and 0.576% of ferrocene;

[0035] (2) cerium stearate, lanthanum citrate, and ferrocene are mixed in proportion, dissolved in a mixed solution of methanol and isopropanol, and stirred at 50° C. for 1 h to obtain a premixed solution;

[0036] (3) The premixed liquid obtained in step (2) is mixed with tetrahydrothiophene, and then n-pentane, 2,3-dimethylbutane, methyl tert-butyl ether and xylene are added thereto in sequence, and the mixture is stirred for 60 minutes, and then allowed to stand for 1.5 hours, and a clarified liquid is obtained to obtain a natural gas additive.

[0037] Comparative Example 1

[0038] A natural gas additive comprises, by weight percentage, 75% of n-pentane, 5% of tetrahydrothiophene, 4% of 2,3-dimethylbutane, 8.5% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 4% of xylene, 0.02% of cerium stearate and 0.48% of ferrocene.

[0039] A method for preparing a natural gas additive comprises the following steps:

[0040] (1) Prepare, by weight percentage, 75% of n-pentane, 5% of tetrahydrothiophene, 4% of 2,3-dimethylbutane, 8.5% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 4% of xylene, 0.02% of cerium stearate, and 0.48% of ferrocene;

[0041] (2) cerium stearate, lanthanum citrate, and ferrocene were mixed in proportion, dissolved in a mixed solution of methanol and isopropanol, and stirred at 40° C. for 1.5 h to obtain a premixed solution;

[0042] (3) The premixed liquid obtained in step (2) is mixed with tetrahydrothiophene, and then n-pentane, 2,3-dimethylbutane, methyl tert-butyl ether and xylene are added thereto in sequence, the mixture is stirred for 60 minutes, and then allowed to stand for 2 hours, and a clarified liquid is obtained to obtain a natural gas additive.

[0043] Comparative Example 2

[0044] A natural gas additive comprises, by weight percentage, 75% of n-pentane, 5% of tetrahydrothiophene, 4% of 2,3-dimethylbutane, 8.5% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 4% of xylene, 0.02% of lanthanum citrate and 0.48% of ferrocene.

[0045] A method for preparing a natural gas additive comprises the following steps:

[0046] (1) Prepare, by weight percentage, 75% of n-pentane, 5% of tetrahydrothiophene, 4% of 2,3-dimethylbutane, 8.5% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 4% of xylene, 0.005% of cerium stearate, 0.005% of lanthanum citrate, and 0.49% of ferrocene;

[0047] (2) cerium stearate, lanthanum citrate, and ferrocene were mixed in proportion, dissolved in a mixed solution of methanol and isopropanol, and stirred at 40° C. for 1.5 h to obtain a premixed solution;

[0048] (3) The premixed liquid obtained in step (2) is mixed with tetrahydrothiophene, and then n-pentane, 2,3-dimethylbutane, methyl tert-butyl ether and xylene are added thereto in sequence, the mixture is stirred for 60 minutes, and then allowed to stand for 2 hours, and a clarified liquid is obtained to obtain a natural gas additive.

[0049] Test Example 1

[0050] The natural gas additive obtained in the above example was added to natural gas in an amount of 1%, and the combustion temperature and gross calorific value were measured with natural gas as a blank control. The results are shown in Table 1.

[0051] Table 1

[0052] deal with Combustion temperature / ℃ Total calorific value / (MJ / kg) Example 1 3410 56.6 Example 2 3385 56.3 Example 3 3430 56.7 Comparative Example 1 3310 53.6 Comparative Example 2 3335 54.2 Blank control 2286 38.4

[0053] As can be seen from Table 1, after adding natural gas additives, the combustion temperature is significantly increased, and the calorific value increases from about 38MJ / kg to about 56MJ / kg, indicating that the natural gas additives produce physical and chemical changes in natural gas, activating it to generate more heat, which can accelerate the combustion speed and promote the full release of its calorific value, while saving the consumption of natural gas.

[0054] Test Example 2

[0055] A Q235A steel plate with a thickness of 25 mm was selected as the cutting object, and the cutting length was 450 m. The cutting data is shown in Table 2.

[0056] Table 2

[0057] deal with Cutting speed / (mm / min) Gas consumption Cutting surface flatness Example 1 510 <![CDATA[20.8m 3 ]]> smooth Example 2 506 <![CDATA[21.1m 3 ]]> smooth Example 3 512 <![CDATA[20.6m 3 ]]> smooth Comparative Example 1 468 <![CDATA[22.3m 3 ]]> smooth Comparative Example 2 472 <![CDATA[22.3m 3 ]]> smooth Acetylene 486 16.5kg smooth

[0058] As can be seen from Table 2, after adding natural gas additives for gas welding and cutting, the cutting speed can reach above 506mm / min, which is higher than the cutting speed of 486mm / min of acetylene, and the cutting surface is smooth. However, the price of natural gas is much lower than that of acetylene, and natural gas burns fully without pollution. Therefore, compared with acetylene, it has the effect of energy saving and environmental protection, and reduces fuel costs.

Claims

1. A natural gas additive, characterized in that: Calculated by weight percentage, it includes 70-80% of n-pentane, 4-6% of tetrahydrothiophene, 3-5% of 2,3-dimethylbutane, 6-10% of methanol, 2-3% of isopropanol, 1-2% of methyl tert-butyl ether, 3-5% of xylene, 0.012-0.018% of cerium stearate, 0.004-0.006% of lanthanum citrate, and 0.38-0.58% of ferrocene.

2. A natural gas additive according to claim 1, characterized in that: The weight ratio of cerium stearate, lanthanum citrate and ferrocene is 3:1:

96.

3. A method for preparing a natural gas additive, characterized in that: The following steps are involved: (1) preparing, by weight percentage, 70-80% of n-pentane, 4-6% of tetrahydrothiophene, 3-5% of 2,3-dimethylbutane, 6-10% of methanol, 2-3% of isopropanol, 1-2% of methyl tert-butyl ether, 3-5% of xylene, 0.012-0.018% of cerium stearate, 0.004-0.006% of lanthanum citrate, and 0.38-0.58% of ferrocene; (2) mixing cerium stearate, lanthanum citrate and ferrocene in proportion, dissolving the mixture in a mixed solution of methanol and isopropanol, and stirring the mixture at 30-50° C. for 1-1.5 h to obtain a premixed solution; (3) The premixed liquid obtained in step (2) is mixed with tetrahydrothiophene, and then n-pentane, 2,3-dimethylbutane, methyl tert-butyl ether and xylene are added thereto in sequence, and the mixture is stirred for 50-60 minutes, and then allowed to stand for 1.5-2 hours, and a clarified liquid is obtained to obtain a natural gas additive.

4. The method for preparing a natural gas additive according to claim 3, characterized in that: In step (1), 75% of n-pentane, 5% of tetrahydrothiophene, 4% of 2,3-dimethylbutane, 8.5% of methanol, 2% of isopropanol, 1% of methyl tert-butyl ether, 4% of xylene, 0.015% of cerium stearate, 0.005% of lanthanum citrate, and 0.48% of ferrocene are prepared by weight percentage.

5. The method for preparing a natural gas additive according to claim 3, characterized in that: In step (2), the mixture was stirred at 40° C. for 1.5 h.

6. The method for preparing a natural gas additive according to claim 3, characterized in that: In step (3), the mixture was stirred for 60 min and then allowed to stand for 2 h.