JP3630444B2 - Solvent for pressurized container of fuel gas for welding fusing and filling storage method - Google Patents
Solvent for pressurized container of fuel gas for welding fusing and filling storage method Download PDFInfo
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- JP3630444B2 JP3630444B2 JP12354894A JP12354894A JP3630444B2 JP 3630444 B2 JP3630444 B2 JP 3630444B2 JP 12354894 A JP12354894 A JP 12354894A JP 12354894 A JP12354894 A JP 12354894A JP 3630444 B2 JP3630444 B2 JP 3630444B2
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- Prior art keywords
- acetylene
- gas
- fuel gas
- welding
- welding fusing
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- 0 *C(C(*)N1*)N(*)C1=O Chemical compound *C(C(*)N1*)N(*)C1=O 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、加圧容器内において溶接溶断用燃料ガスを安定に溶解する能力を有する溶解剤および充填貯蔵方法に関するものである。更に詳しく述べるならば、アセチレンを主材とする混合燃料ガスまたはアセチレンを、加圧下で安定に高濃度に溶解することができ、しかも毒性が少なく安全性の高い溶解剤および充填貯蔵方法に関するものである。
【０００２】
【従来の技術】
アセチレンガスは、古くより鋼材など溶接溶断用のガスとして、もっとも適したものとして賞用されてきた。さらに、アセチレンソースであるカルシウムカーバイドの入手が困難となった近年は、コストを下げるためにエチレンガスやＬＰガス等をアセチレンガスに混合させた混合ガスが、溶接溶断用のガスとして使用されている。
【０００３】
しかし、これらアセチレンおよびアセチレンを主材とした溶接溶断用混合ガスは、爆発の危険性がきわめて大きいガスであるため、これらをそのままボンベへ圧縮充填することができない。このため、アセチレンボンベは従来ケイ酸カルシウムやその他の多孔質無機充填剤を詰め、かつアセトンやジメチルホルムアミド（ＤＭＦ）などの溶剤を入れたのち、これにアセチレンガスを導入して該溶剤中に吸収溶解せしめて、いわゆる溶解アセチレンボンベの形にして販売使用するのが常であった。
【０００４】
しかしながら、アセチレンガスを溶解させるのに広く用いられるアセトンは、アセチレンを溶解する能力が極めて低く、高濃度に溶解させるのに難点がある。また、溶解速度も小さいため短時間に多くのアセチレンを溶解させることは不可能であり、溶解アセチレン製造工場においては、圧縮機を用いてごく少量ずつ、気体状で長時間かけて高圧容器に充填貯蔵しているのが現状である。
【０００５】
このような方法によって一本の容器にアセチレンを規定量貯蔵させるのに要する時間は、普通８時間を超え、その上、この時の容器内圧力は２５Ｋｇ／ｃｍ２ゲージにも達する。このように容器内が高圧になるのは、アセチレンのアセトンへの溶解速度以上に、圧縮機により強制的にアセチレンを加圧して高圧容器に充填するためにアセチレンがアセトンに完全に溶けこんでいないことと、アセチレン溶解時に発生する溶解熱のために高圧容器内温度が上昇することによるものである。
【０００６】
もとより、このような高圧状態は、アセチレンの不安定性からみて好ましい状態でないことはいうまでもない。このような危険を回避するために、アセトン中にアセチレンが完全に溶解してしまうまで、高圧容器を静置させる必要があり、現に、高圧ガス取締り法によって、アセチレンを容器に貯蔵完了したのち、容器内圧力が１５．５Ｋｇ／ｃｍ２ゲージ（外気温度１５℃）以下になるまで静置させておくべきことが義務づけられている。ところが、この静置する時間だけでも、普通２５時間を要する。
【０００７】
したがって、高圧容器に規定量のアセチレンを充填する工場では、作業員が２４時間、３交代で充填作業をしているのが実状であり、これがしばしば爆発の災害をみる一因となっている。
【０００８】
一方、ＤＭＦはアセトンよりアセチレンの溶解能が大きく充填時間の短縮に寄与することができるが、毒性が高く、人体への有害性が大きいことは知られており、取り扱い上の安全性に問題がある。
【０００９】
これら溶接溶断用燃料ガスの取扱に従事する者に対する、毒性および爆発性などの安全性の面から、毒性が少なく、かつアセチレンを主材とする溶接溶断用ガスおよびアセチレンガスの溶解能が高い溶解剤が求められていた。
【００１０】
【発明が解決しようとする課題】
本発明は、毒性が低く、かつアセチレンを主材とする溶接溶断用ガスおよびアセチレンガスに対する溶解能が高い溶解剤および溶接溶断用燃料ガスの充填貯蔵方法を提供しようとするものである。
【００１１】
【課題を解決するための手段】
本発明者らは、毒性が少なく安全性の高い各種溶剤とアセチレンガスの溶解性との関係を鋭意検討した結果、特定化学構造を有する複素環有機化合物からなる極性溶剤が、アセチレンを主材とする溶接溶断用ガスおよびアセチレンガスの溶解能が高いことを見いだし、本発明を完成した。
【００１２】
すなわち、本発明は、 一般式（Ｉ）
【００１３】
【化３】
〔但し、式中、Ｒ１，Ｒ２，Ｒ３およびＲ４は、それぞれ水素原子またはメチル基を表わすが、Ｒ１，Ｒ２，Ｒ３およびＲ４のうち少なくとも１個が、メチル基である〕で示されるアルキルイミダゾリジノン化合物から選ばれた少なくとも１種からなることを特徴とする溶接溶断用燃料ガスの加圧容器用溶解剤および前記一般式（１）で示されるアルキルイミダゾリジノン化合物を溶解剤として用いることを特徴とする溶接溶断用燃料ガスの充填貯蔵方法に関するものである。
【００１５】
本発明で溶解剤として用いられるアルキルイミダゾリジノン化合物は、前記一般式（１）で示される含窒素複素環化合物であるが、具体的には、１，３−ジメチル−２−イミダゾリジノン（ＤＭＩ）、および１，３，４−トリメチル−２−イミダゾリジノン（ＴＭＩ）等があり、これらは表１に示すように、アセチレンに対して優れた溶解能を有し、さらに表２に示すとおり優れた安全性を示す。
【００１６】
本発明の溶解剤の対象となる溶接溶断用燃料ガスとは、アセチレンまたはアセチレンを主材とする混合ガスである。アセチレンを主材とする混合ガスに用いられるガスは、プロピレン、プロパン、ブタノン等のガスである。
【００１７】
本発明の溶接溶断用燃料ガスの液化貯留方法は、前記一般式（１）で示されるアルキルイミダゾリジノン化合物から選ばれた少なくとも１種からなる溶解剤を含浸させた多孔質無機充填剤を詰めたボンベ中に、液化したアセチレンまたはアセチレンを主材とした溶接溶断用ガスを多量に加圧溶解することを特徴とするものである。
【００１８】
溶解剤を含浸させるための多孔質無機充填剤としては、公知のものを用いることができるが、例えば、ケイ酸カルシウム、等の無機化合物を挙げることができる。
【００１９】
【表１】
【表２】
【実施例】
以下、本発明を実施例により詳細に説明する。
【００２２】
実施例１
無機充填剤として、多孔質のケイ酸カルシウムが充填された高圧ガスボンベに、該ボンベの内容積に対して３５％のＤＭＩを均等にをしみこませた中に、プロパンガス：アセチレンガスの容量比が３０：７０の混合ガスを圧縮機により圧縮して、充填量１５．５Ｋｇ／ｃｍ２（１５℃）に仕込んだ。なお仕込から容器に貯蔵完了したのち、容器内圧力が１５．５Ｋｇ／ｃｍ２ゲージ（外気温度１５℃）以下になるまでに要した時間は従来の溶剤を用いたときより１割程度短縮できた。
【００２３】
この混合ガスは、爆発の危険性なく容易に充填され、従来のアセトンを溶剤として用いた場合と同程度の溶接溶断性を示した。なお、得られたボンベは、貯蔵あるいは運搬に対してまったく安全であった。
【００２４】
実施例２
無機充填剤として、多孔質のケイ酸カルシウムが充填された高圧ガスボンベに、該ボンベの内容積に対して４０％のＴＭＩを均等にしみこませた中に、市販のプロパンガス：アセチレンガスの容量比が２０：８０の混合ガスを圧縮機により圧縮して、充填量１５．５Ｋｇ／ｃｍ２（１５℃）に仕込んだ。なお仕込から容器に貯蔵完了したのち、容器内圧力が１５．５Ｋｇ／ｃｍ２ゲージ（外気温度１５℃）以下になるまでに要した時間は従来の溶剤を用いたときより１割程度短縮できた。
【００２５】
この混合ガスは、爆発の危険性なく容易に充填され、従来のアセトンを溶剤として用いた場合と同程度の溶接溶断性を示した。なお、得られたボンベは、貯蔵あるいは運搬に対してまったく安全であった。
【００２６】
実施例３
無機充填剤として、多孔質のケイ酸カルシウムが充填された高圧ガスボンベに、該ボンベの内容積に対して４０％のＤＭＩ：ＴＭＩの混合溶剤（混合比：５０：５０）を均等にをしみこませた中に、市販のプロパンガス：アセチレンガスの容量比が２０：８０の混合ガスを圧縮機により圧縮して、充填量１５．５Ｋｇ／ｃｍ２（１５℃）に仕込んだ。なお仕込から容器に貯蔵完了したのち、容器内圧力が１５．５Ｋｇ／ｃｍ２ゲージ（外気温度１５℃）以下になるまでに要した時間は従来の溶剤を用いたときより１割程度短縮できた。
【００２７】
この混合ガスは、爆発の危険性なく容易に充填され、従来のアセトンを溶剤として用いた場合と同程度の溶接溶断性を示した。なお、得られたボンベは、貯蔵あるいは運搬に対してまったく安全であった。
【００２８】
【発明の効果】
無機充填剤として、多孔質のケイ酸カルシウムが充填された高圧ガスボンベに本発明の複素環有機化合物からなる極性溶剤を均等にをしみこませることにより、従来より速やかにアセチンガスおよびアセチレンを主材とする溶接溶断用ガスが加圧溶解した取扱が安全かつ容易な溶接溶断用燃料ガスを得ることができる。また、本発明で用いるアルキルイミダゾリジノン化合物は、アセトンに比べ極めて蒸気圧が低く、沸点が高いことから、混合ガス放出時のエントレーメントによる減少が避けられ、補充溶剤分だけコストが安価になるだけでなく、その補充操作を行う手数も省きうるという利点がある。さらに、原子吸光分析用のアセチレンガスの貯蔵用溶剤として用いる場合は、蒸気圧の高いアセトンが放出されることに起因する炎の不安定化を示さない。[0001]
[Industrial application fields]
The present invention relates to a dissolving agent and a filling storage method having the ability to stably dissolve fuel gas for welding fusing in a pressurized container. More specifically, the present invention relates to a mixed solvent gas or acetylene containing acetylene as a main material, which can be stably dissolved at a high concentration under pressure and has low toxicity and high safety, and a filling storage method. is there.
[0002]
[Prior art]
Acetylene gas has long been prized as the most suitable gas for welding fusing, such as steel. Furthermore, in recent years when it has become difficult to obtain calcium carbide, which is an acetylene source, a mixed gas obtained by mixing ethylene gas, LP gas, or the like with acetylene gas is used as a welding fusing gas in order to reduce costs. .
[0003]
However, since these acetylene and a mixed gas for welding fusing mainly composed of acetylene are gases having an extremely high risk of explosion, they cannot be compressed and filled into a cylinder as they are. For this reason, acetylene cylinders are conventionally filled with calcium silicate and other porous inorganic fillers, and after adding a solvent such as acetone or dimethylformamide (DMF), acetylene gas is introduced into the solvent and absorbed in the solvent. It was usually sold and used in the form of a so-called dissolved acetylene cylinder after being dissolved.
[0004]
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, because the dissolution rate is low, it is impossible to dissolve a large amount of acetylene in a short time. At a dissolved acetylene production plant, a high-pressure vessel is filled in small amounts in a gaseous state over a long period of time using a compressor. It is currently stored.
[0005]
The time required to store a predetermined amount of acetylene in one container by such a method usually exceeds 8 hours, and the pressure in the container at this time reaches 25 Kg / cm 2 gauge. The reason why the pressure inside the container becomes high is that the acetylene is not completely dissolved in acetone because the acetylene is forcibly pressurized by the compressor and filled into the high-pressure container more than the dissolution rate of acetylene in acetone. This is because the temperature in the high-pressure vessel rises due to the heat of dissolution that occurs during acetylene dissolution.
[0006]
Needless to say, such a high-pressure state is not preferable in view of the instability of acetylene. In order to avoid such danger, it is necessary to leave the high-pressure container until the acetylene is completely dissolved in acetone. After the storage of acetylene in the container is actually completed by the high-pressure gas control method, It is obliged that the container should be allowed to stand until the pressure inside the container becomes 15.5 kg / cm 2 gauge (outside temperature 15 ° C.) or less. However, this standing time alone usually requires 25 hours.
[0007]
Therefore, in a factory that fills a high-pressure vessel with a specified amount of acetylene, it is the actual situation that workers carry out filling work in three shifts for 24 hours, which is often a cause of seeing explosion disasters.
[0008]
On the other hand, DMF has a higher ability to dissolve acetylene than acetone and can contribute to shortening the filling time. However, DMF is known to be highly toxic and highly harmful to the human body, which causes problems in handling safety. is there.
[0009]
For those engaged in the handling of fuel gas for welding fusing, from the aspect of safety such as toxicity and explosiveness, it is less toxic and has a high melting ability for welding fusing gas and acetylene gas mainly composed of acetylene An agent was sought.
[0010]
[Problems to be solved by the invention]
An object of the present invention is to provide a welding cutting gas having a low toxicity and a melting agent having a high melting ability with respect to acetylene gas and a filling gas storage method for welding fusing fuel gas.
[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 a polar solvent comprising a heterocyclic organic compound having a specific chemical structure has acetylene as the main material. The present invention has been completed by finding that the welding melting gas and acetylene gas have high melting ability.
[0012]
That is, the present invention relates to the general formula (I)
[0013]
[Chemical 3]
[In the formula, R 1 , R 2 , R 3 and R 4 each represent a hydrogen atom or a methyl group, but at least one of R 1 , R 2 , R 3 and R 4 is a methyl group. A melting agent for a pressurized container of a fuel gas for welding fusing, and an alkyl imidazolidinone represented by the general formula (1), characterized by comprising at least one selected from alkyl imidazolidinone compounds represented by formula (1) The present invention relates to a method for filling and storing a fuel gas for welding fusing characterized by using a compound as a dissolving agent.
[0015]
The alkyl imidazolidinone compound used as a solubilizer in the present invention is a nitrogen-containing heterocyclic compound represented by the general formula (1), and specifically, 1,3-dimethyl-2-imidazolidinone ( DMI), and 1,3,4-trimethyl-2-imidazolidinone (TMI), etc., which have excellent solubility in acetylene as shown in Table 1, and further shown in Table 2. Excellent safety as shown.
[0016]
The welding fusing fuel gas that is the object of the dissolving agent of the present invention is acetylene or a mixed gas mainly composed of acetylene. The gas used for the mixed gas containing acetylene as a main material is a gas such as propylene, propane, or butanone.
[0017]
The method for liquefying and storing fuel gas for welding fusing according to the present invention is packed with a porous inorganic filler impregnated with at least one solvent selected from alkyl imidazolidinone compounds represented by the general formula (1). In addition, a large amount of liquefied acetylene or welding fusing gas mainly composed of acetylene is pressurized and dissolved in the cylinder.
[0018]
As the porous inorganic filler for impregnating the dissolving agent, known ones can be used, and examples thereof include inorganic compounds such as calcium silicate.
[0019]
[Table 1]
[Table 2]
【Example】
Hereinafter, the present invention will be described in detail with reference to examples.
[0022]
Example 1
A high-pressure gas cylinder filled with porous calcium silicate as an inorganic filler was impregnated with 35% DMI evenly with respect to the internal volume of the cylinder, and the volume ratio of propane gas: acetylene gas was A mixed gas of 30:70 was compressed by a compressor and charged to a filling amount of 15.5 kg / cm 2 (15 ° C.). In addition, after completing the storage from the preparation to the container, the time required for the pressure inside the container to become 15.5 Kg / cm 2 gauge (outside air temperature 15 ° C.) or less could be reduced by about 10% compared with the case of using a conventional solvent. .
[0023]
This mixed gas was easily filled without the risk of explosion, and showed the same welding fusing property as when acetone was used as a solvent. The obtained cylinder was completely safe for storage or transportation.
[0024]
Example 2
A volume ratio of commercially available propane gas: acetylene gas was obtained by uniformly impregnating 40% TMI with respect to the internal volume of a high-pressure gas cylinder filled with porous calcium silicate as an inorganic filler. Was compressed with a compressor and charged to a filling amount of 15.5 kg / cm 2 (15 ° C.). In addition, after completing the storage from the preparation to the container, the time required for the pressure inside the container to become 15.5 Kg / cm 2 gauge (outside air temperature 15 ° C.) or less could be reduced by about 10% compared with the case of using a conventional solvent. .
[0025]
This mixed gas was easily filled without the risk of explosion, and showed the same welding fusing property as when acetone was used as a solvent. The obtained cylinder was completely safe for storage or transportation.
[0026]
Example 3
As an inorganic filler, impregnate a high-pressure gas cylinder filled with porous calcium silicate with 40% DMI: TMI mixed solvent (mixing ratio: 50:50) evenly with respect to the internal volume of the cylinder. In addition, a commercially available propane gas: acetylene gas mixed gas having a volume ratio of 20:80 was compressed by a compressor and charged to a filling amount of 15.5 kg / cm 2 (15 ° C.). In addition, after completing the storage from the preparation to the container, the time required for the pressure inside the container to become 15.5 Kg / cm 2 gauge (outside air temperature 15 ° C.) or less could be reduced by about 10% compared with the case of using a conventional solvent. .
[0027]
This mixed gas was easily filled without the risk of explosion, and showed the same welding fusing property as when acetone was used as a solvent. The obtained cylinder was completely safe for storage or transportation.
[0028]
【The invention's effect】
As an inorganic filler, a high-pressure gas cylinder filled with porous calcium silicate is uniformly impregnated with the polar solvent composed of the heterocyclic organic compound of the present invention, so that acetylene gas and acetylene are used as the main material more quickly than before. It is possible to obtain a welding fusing fuel gas that is safe and easy to handle when the welding fusing gas is dissolved under pressure. In addition, the alkyl imidazolidinone compound used in the present invention has an extremely low vapor pressure and a high boiling point compared to acetone, so that a decrease due to entrainment when the mixed gas is released is avoided, and the cost is reduced by the amount of the replenishing solvent. In addition, there is an advantage that it is possible to save the trouble of performing the replenishment operation. Furthermore, when used as a storage solvent for acetylene gas for atomic absorption analysis, flame destabilization due to the release of acetone with a high vapor pressure is not exhibited.
Claims (5)
で示されるアルキルイミダゾリジノン化合物から選ばれた少なくとも１種からなることを特徴とする溶接溶断用燃料ガスの加圧容器用溶解剤。Formula (I)
A solubilizer for pressurized gas of welding fusing fuel gas, comprising at least one selected from alkylimidazolidinone compounds represented by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12354894A JP3630444B2 (en) | 1994-06-06 | 1994-06-06 | Solvent for pressurized container of fuel gas for welding fusing and filling storage method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12354894A JP3630444B2 (en) | 1994-06-06 | 1994-06-06 | Solvent for pressurized container of fuel gas for welding fusing and filling storage method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07331266A JPH07331266A (en) | 1995-12-19 |
| JP3630444B2 true JP3630444B2 (en) | 2005-03-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12354894A Expired - Fee Related JP3630444B2 (en) | 1994-06-06 | 1994-06-06 | Solvent for pressurized container of fuel gas for welding fusing and filling storage method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3630444B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11939451B2 (en) | 2020-02-20 | 2024-03-26 | Praxair Technology, Inc. | Solvents for acetylene fluid storage |
-
1994
- 1994-06-06 JP JP12354894A patent/JP3630444B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07331266A (en) | 1995-12-19 |
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