Welding and cutting gas and preparation method thereof

Abstract

The invention discloses a welding and cutting gas which consists of a natural gas and a gain agent, wherein the gain agent consists of a rare earth metal compound, a transition metallocene compound, methanol, toluene, methyl tertiary butyl ether, cyclohexane, nonane, decane and water. Compared with acetylene and propane, the welding and cutting gas is more economical, more energy-saving, more environment-friendly, safer and cleaner. The invention also provides a preparation method of the welding and cutting gas.

Description

technical field [0001] The invention relates to the field of industrial gas, in particular to a welding and cutting gas and a preparation method thereof. Background technique [0002] Acetylene has been used as a welding and cutting gas for a hundred years, but it is easy to form carbon deposits after welding and cutting, which is not smooth and easy to solidify near the cutting edge, so it needs to be ground again to remove carbon deposits, resulting in secondary costs. Moreover, acetylene is explosive and has a low safety factor. The production process not only consumes energy and pollutes the environment, but there are many defects and hidden dangers in the production, storage, transportation, use, environmental protection and price of acetylene. [0003] Therefore, many countries are developing new safer and more energy-saving welding and cutting gas to replace acetylene gas. Some researchers use liquefied petroleum gas as fuel, and use persulfate, hydrogen peroxide, an...

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Problems solved by technology

This method improves the combustion value of liquefied petroleum gas, and tries to solve the safety problem of gas use to a certain extent by using additives, but the purpose is not achieved, and the following problems still exist: ① When the temperature of liquefied petroleum gas is low in winter, It cannot be fully gasified, and heating is required to completely gasify; ②The quality of welding and cutting has not reached the level of acetylene, so it cannot be completely replaced; the used persulfate, hydrogen peroxide, and potassium permanganate decompose quickly in alkaline aqueous solution , the decomposition is complete within a few hours or a few days, and has no long-term effect; ③The oxygen produced by the decomposition of the above-mentioned strong oxidant is mixed with the liquefied petroleum gas, and it is easy to explode, posing a safety hazard; ④The alkali of the strong oxidant used Non-polar aqueous solution and liquefied petroleum gas are immiscible. The former is a strong polar substance, while the latter is a non-polar substance. The polarity is very different and cannot be uniformly miscible. In the container, the upper layer is liquefied petroleum gas, and the lower layer is an aqueous solution of oxidant. , the role of additives is difficult to play, because the oxidant deposits on the bottom of the steel cylinder, it also causes corrosion to the steel cylinder, shortening the service life of the steel cylinder

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