JPH07331266A - Solubilization agent for pressure container for fuel gas for welding and melt cutting and method for packing and preserving - Google Patents

Abstract

PURPOSE:To obtain a solubilization agent for a pressure container having low toxicity, capable of highly solubilizing a gas for welding and melt cutting consisting essentially of acetylene, providing a safely and readily handleable gas, comprising at least one of a specific alkylimidazolidinone compound. CONSTITUTION:At least one of an alkylimidazolidinone compound of the formula (R<1> to R<4> are H and at least one of R<1> to R<4> is methyl) such as 1,3-dime thyl-2- imidazolidinone or 1,3,4-trlmethyl-2-imidazolidinone is used to give the objective solubilization agent for a pressure container, having low toxicity and high dissolution power of a gas for welding and melt cutting consisting essentially of acetylene and an acetylene gas, providing a fuel gas for welding and melt cutting with safe and ready handling. This solubilizing gas is impregnated into a porous inorganic filler in a high-pressure container, acetylene or a mixed gas consisting essentially of acetylene is pressurized and compressed and packed into the high-pressure container to preserve a fuel gas for welding and melt cutting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dissolving agent having the ability to stably dissolve a fuel gas for welding and fusing in a pressurized container, and a filling and storing method. More specifically, it relates to a solubilizer and a filling and storing method which can dissolve a mixed fuel gas containing acetylene as a main material or acetylene in a stable and high concentration under pressure and has low toxicity and high safety. is there.

[0002]

2. Description of the Related Art Acetylene gas has long been used as the most suitable gas for welding and fusing welding of steel materials. Furthermore, in recent years, when it becomes difficult to obtain calcium carbide, which is an acetylene source, a mixed gas obtained by mixing ethylene gas, LP gas, etc., with acetylene gas is used as a gas for welding fusing in order to reduce costs. .

However, since the acetylene and the mixed gas for welding and fusing containing acetylene as the main material have a very high risk of explosion, they cannot be directly compressed and filled into the cylinder. Therefore, acetylene cylinders are conventionally packed with calcium silicate and other porous inorganic fillers, and after a solvent such as acetone or dimethylformamide (DMF) is put therein, acetylene gas is introduced into the acetylene cylinder to absorb it in the solvent. It has been used for sale after being dissolved in the form of a so-called dissolved acetylene cylinder.

However, acetone, which is widely used for dissolving acetylene gas, has a very low ability to dissolve acetylene and has a difficulty in dissolving it at a high concentration. In addition, since the dissolution rate is low, it is impossible to dissolve a large amount of acetylene in a short time.In a dissolution acetylene manufacturing plant, a compressor is used to fill a high-pressure container in a gaseous state for a long time in very small amounts. It is currently stored.

The time required to store a specified amount of acetylene in one container by such a method usually exceeds 8 hours, and the pressure in the container at this time is 25 Kg / c.
It reaches m ² gauge. The high pressure inside the container means that acetylene is not completely dissolved in acetone because the compressor is forced to pressurize acetylene to fill the high-pressure container at a rate faster than the dissolution rate of acetylene in acetone. This is because the temperature inside the high-pressure container rises due to the heat of dissolution generated when acetylene is dissolved.

Needless to say, such a high-pressure state is not preferable in view of the instability of acetylene. In order to avoid such a danger, it is necessary to leave the high-pressure container stationary until the acetylene is completely dissolved in acetone, and in fact, by the high-pressure gas control method, after storing acetylene in the container, Pressure inside the container is 15.5 Kg / cm ² gauge (outside air temperature 15 ° C)
It is obligatory to leave it to stand until it becomes below. However, it is usually 2
It takes 5 hours.

Therefore, in a factory where a high-pressure container is filled with a specified amount of acetylene, it is the actual situation that the workers perform the filling work in three shifts for 24 hours, which is one of the causes of often seeing an explosion disaster. ing.

On the other hand, DMF has a greater ability to dissolve acetylene than acetone and can contribute to shortening the filling time. However, it is known that DMF is highly toxic and harmful to the human body, and is safe in handling. I have a problem.

From the viewpoint of safety such as toxicity and explosiveness to those who are engaged in handling these fuel gases for welding and fusing, the toxicity of the welding fusing gas and acetylene gas is low and the toxicity is low. There was a demand for a solubilizer having a high

[0010]

DISCLOSURE OF THE INVENTION The present invention provides a method of filling and storing a welding gas containing acetylene as a main material, a welding fusing gas and a dissolving agent having a high dissolving ability for acetylene gas, and a welding fusing fuel gas. Is what you are trying to do.

[0011]

Means for Solving the Problems As a result of intensive studies on the relationship between various toxic and highly safe solvents and the solubility of acetylene gas, the present inventors have found that they consist of heterocyclic organic compounds having a specific chemical structure. The present inventors have completed the present invention by finding that a polar solvent has a high ability to dissolve a welding fusing gas and acetylene gas, which mainly contains acetylene.

That is, the present invention has the general formula (I)

[0013]

[Chemical 3]

[Wherein R ¹ , R ² , R ³ and R
⁴ represents a hydrogen atom or a methyl group, respectively,
At least one of R ¹ , R ² , R ³ and R ⁴ is a methyl group] and a fuel gas for welding and fusing, comprising at least one selected from the group consisting of alkylimidazolidinone compounds represented by And a method for filling and storing a fuel gas for welding and fusing, which comprises using the dissolving agent for a pressurized container and the alkylimidazolidinone compound represented by the general formula (1) as a dissolving agent.

The alkyl imidazolidinone compound used as the solubilizer in the present invention is a nitrogen-containing heterocyclic compound represented by the above general formula (1), and specifically, 1,3-
Dimethyl-2-imidazolidinone (DMI), and 1,3,4-trimethyl-2-imidazolidinone (TM
I) and the like, which have excellent solubility in acetylene as shown in Table 1 and exhibit excellent safety as shown in Table 2.

The fuel gas for welding and fusing which is the object of the dissolving agent of the present invention is acetylene or a mixed gas containing acetylene as a main material. The gas used as the mixed gas containing acetylene as a main material is a gas such as propylene, propane, butanone.

The method for liquefying and storing a fuel gas for welding fusing according to the present invention is a porous inorganic filling impregnated with a dissolving agent composed of at least one selected from the alkylimidazolidinone compounds represented by the general formula (1). In a cylinder filled with agent,
The present invention is characterized in that a large amount of liquefied acetylene or a gas for welding and fusing mainly composed of acetylene is melted under pressure.

As the porous inorganic filler for impregnating with the dissolving agent, known ones can be used, and examples thereof include inorganic compounds such as calcium silicate.

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

EXAMPLES The present invention will be described in detail below with reference to examples.

Example 1 A high-pressure gas cylinder filled with porous calcium silicate as an inorganic filler was used, and the content of the high-pressure gas cylinder was 35 with respect to the internal volume of the cylinder.
% DMI is uniformly impregnated with the mixture, and a mixed gas having a volume ratio of propane gas: acetylene gas of 30:70 is compressed by a compressor to have a filling amount of 15.5 Kg / cm.
^It was charged to ² (15 ° C). After the completion of storage in the container after the preparation, the time required for the internal pressure of the container to reach 15.5 Kg / cm ² gauge (outside air temperature 15 ° C) or less could be shortened by about 10% as compared with the conventional solvent. .

This mixed gas was easily filled without danger of explosion, and exhibited the same weld fusing property as when conventional acetone was used as a solvent. The obtained cylinder is
It was totally safe for storage or transportation.

Example 2 A high-pressure gas cylinder filled with porous calcium silicate as an inorganic filler was used, and its content was 40 with respect to the inner volume of the cylinder.
% TMI evenly soaked, a commercially available mixed gas having a volume ratio of propane gas: acetylene gas of 20:80 was compressed by a compressor to have a filling amount of 15.5 Kg / cm ^2.
It was charged at (15 ° C). After the completion of storage in the container after the preparation, the time required for the internal pressure of the container to reach 15.5 Kg / cm ² gauge (outside air temperature 15 ° C) or less could be shortened by about 10% compared to the case where the conventional solvent was used. .

This mixed gas was easily filled without danger of explosion, and exhibited the same weld fusing property as when conventional acetone was used as a solvent. The obtained cylinder is
It was totally safe for storage or transportation.

Example 3 A high-pressure gas cylinder filled with porous calcium silicate as an inorganic filler was used, and the content of the high-pressure gas cylinder was 40 with respect to the inner volume of the cylinder.
% DMI: TMI mixed solvent (mixing ratio: 50:50)
Was uniformly impregnated, and a commercially available mixed gas having a volume ratio of propane gas: acetylene gas of 20:80 was compressed by a compressor to obtain a filling amount of 15.5 Kg / cm ² (15
℃). After the completion of storage in the container after the preparation, the time required for the internal pressure of the container to reach 15.5 Kg / cm ² gauge (outside air temperature 15 ° C) or less could be shortened by about 10% as compared with the conventional solvent. .

This mixed gas was easily filled without danger of explosion, and exhibited the same weld fusing property as when conventional acetone was used as a solvent. The obtained cylinder is
It was totally safe for storage or transportation.

[0028]

As a mineral filler, a high-pressure gas cylinder filled with porous calcium silicate is uniformly impregnated with a polar solvent composed of the heterocyclic organic compound of the present invention, so that acetylene gas and acetylene can be discharged more quickly than before. It is possible to obtain a fuel gas for welding fusing which is safe and easy to handle, in which the gas for welding fusing mainly composed of is melted under pressure.
Further, the alkyl imidazolidinone compound used in the present invention has an extremely low vapor pressure and a high boiling point as compared with acetone, so that the reduction due to entrainment at the time of releasing the mixed gas can be avoided, and the cost can be reduced only for the replenishing solvent. In addition to the above, there is an advantage that the number of steps for the replenishment operation can be omitted. Further, when it is used as a storage solvent for acetylene gas for atomic absorption analysis, it does not show destabilization of the flame due to the release of acetone having a high vapor pressure.

Claims (5)

[Claims] 1. A compound represented by the general formula (I): [In the formula, R ¹ , R ² , R ³ and R ⁴ each represent a hydrogen atom or a methyl group, and at least one of R ¹ , R ² , R ³ and R ⁴ is a methyl group. [1] A dissolving agent for a pressure vessel of a fuel gas for welding fusing, comprising at least one selected from the alkylimidazolidinone compounds represented by 2. The alkyl imidazolidinone compound of the general formula (I) is 1,3-dimethyl-2-imidazolidinone or 1,3,4-trimethyl-2-imidazolidinone. Dissolvent for pressurized container of fuel gas for welding and fusing. 3. The melt-dissolving agent for a pressure vessel for welding melt-cutting fuel according to claim 1, wherein the fuel gas for welding melt-cutting is acetylene or a mixed gas containing acetylene as a main material. 4. A method of filling and storing a fuel gas for welding and fusing, wherein acetylene or a mixed gas containing acetylene as a main material is compressed under pressure and dissolved in a dissolving agent impregnated in a porous inorganic filler in a high-pressure container. As the solubilizer, a compound represented by the general formula (I): [Wherein R ¹ , R ² , R ³ and R ⁴ each represent a hydrogen atom or a methyl group, and at least one of R ¹ , R ² , R ³ and R ⁴ is a methyl group. There is used at least one selected from the alkylimidazolidinone compounds represented by [1]. 5. The alkyl imidazolidinone compound of the general formula (I) is 1,3-dimethyl-2-imidazolidinone or 1,3,4-trimethyl-2-imidazolidinone. Fuel gas filling and storage method for welding and fusing.