Natural gas hydrates represent a valid opportunity to counteract two of the most serious issues that are affecting humanity this century: climate change and the need for new energy sources, due to the fast and constant increase in the population worldwide. The energy that might be produced with methane contained in hydrates is greater than any amount of energy producible with known conventional energy sources; being widespread in all oceans, they would greatly reduce problems and conflicts associated with the monopoly of energy sources. The possibility of extracting methane and simultaneously performing the permanent storage of carbon dioxide makes hydrate an almost carbon-neutral energy source. The main topic of scientific research is to improve the recovery of technologies and guest species replacement strategies in order to make the use of gas hydrates economically advantageous. In the present paper, an experimental study on how salt can alter the formation process of both methane and carbon dioxide hydrate was carried out. The pressure–temperature conditions existing between the two respective equilibrium curves are directly proportional to the effectiveness of the replacement process and thus its feasibility. Eighteen formation tests were realized at three different salinity values: 0, 30 and 37 g/L. Results show that, as the salinity degree increases, the space between CO₂ and CH₄ formation curves grows. A further aspect highlighted by the tests is how the carbon dioxide formation process tends to assume a very similar trend in all experiments, while curves obtained during methane tests show a similar trend but with some significant differences. Moreover, this tendency became more pronounced with the increase in the salinity degree.

中文翻译：

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水盐度是提高天然气水合物储层中二氧化碳替代过程有效性的潜在手段

天然气水合物是解决本世纪影响人类的两个最严重问题的有效机会：由于全球人口的持续快速增长，气候变化和对新能源的需求。水合物中所含甲烷可能产生的能量大于已知常规能源可产生的任何能量。它们在所有海洋中广泛分布，将大大减少与能源垄断相关的问题和冲突。提取甲烷并同时永久存储二氧化碳的可能性使水合物几乎成为碳中和的能源。科学研究的主要主题是提高技术的回收率和客体物种替代策略，以使使用天然气水合物具有经济优势。本文对盐如何改变甲烷和二氧化碳水合物的形成过程进行了实验研究。在两条相应的平衡曲线之间存在的压力-温度条件与替换过程的有效性及其可行性成正比。在三个不同的盐度值：0、30和37 g / L时，进行了18次地层测试。结果表明，随着盐度的增加，CO之间的空间 进行了有关盐如何改变甲烷和二氧化碳水合物形成过程的实验研究。在两条相应的平衡曲线之间存在的压力-温度条件与替换过程的有效性及其可行性成正比。在三个不同的盐度值：0、30和37 g / L时，进行了18次地层测试。结果表明，随着盐度的增加，CO之间的空间 进行了有关盐如何改变甲烷和二氧化碳水合物形成过程的实验研究。在两条相应的平衡曲线之间存在的压力-温度条件与替换过程的有效性及其可行性成正比。在三个不同的盐度值：0、30和37 g / L时，进行了18次地层测试。结果表明，随着盐度的增加，CO之间的空间₂和CH _4的形成曲线会增长。这些测试突出显示的另一个方面是，在所有实验中，二氧化碳的形成过程倾向于呈现出非常相似的趋势，而甲烷测试过程中获得的曲线显示出相似的趋势，但有一些显着差异。而且，随着盐度的增加，这种趋势变得更加明显。