اثر مواد فعال سطحی غیر یونی بر سرعت تشکیل هیدرات متان و ظرفیت ذخیره‌سازی آن

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی امیرکبیر، دانشکده مهندسی شیمی

2 پژوهشگاه صنعت نفت

چکیده

در سال‌های اخیر ایده استفاده از هیدرات گاز طبیعی برای ذخیره‌سازی و انتقال گاز مطرح شده است. بدین علت که می‌توان آن را در دمایی بسیار بالاتر از گاز طبیعی مایع شده، تولید و منتقل نمود. هدف اصلی در این تحقیق بررسی تأثیر مواد فعال سطحی غیر یونی Tween-20 و Tween-800 بر روی سرعت تشکیل هیدرات متان و ظرفیت ذخیره‌سازی آن است. Tween-20 با غلظت‌های 1000 و ppm 2000 و Tween-80 با غلظت‌های 100 و ppm 500 به کارگرفته شده و نتایج با هیدرات تشکیل شده در آب خالص و محلول آبی با غلظت ppm 500 از SDS مقایسه شده است. غلظت‌های مختلف مواد فعال سطحی غیر یونی، اثرات متفاوتی بر روی سرعت تشکیل هیدرات و ظرفیت ذخیره‌سازی آن داشت. از این تحقیق نتیجه گرفته شد که ppm 2000 از Tween-20، سرعت تشکیل هیدرات و ظرفیت ذخیره‌سازی آن را بالا می‌برد. این درحالی است که وقتی ppm 1000 از این ماده به کار گرفته شد، به صورت مؤثری از تشکیل هیدرات جلوگیری کرد. Tween-80 در هر دو غلظت به کار رفته، سرعت تشکیل هیدرات را کم کرد و بیشترین ظرفیت ذخیره‌سازی مربوط به ماده Tween-20 با غلظت ppm 2000 بود که برابر (V/V) 125 به دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Non-ionic Surfactants on Methane Hydrate Formation Rate and Storage Capacity

نویسندگان [English]

  • Hajar Fakharian 1
  • Abbas Naderifar 1
  • Hamid Ganji 2
  • Mohammad Rahmani 1
1 Chemical Engineering Department, Amirkabir University of Technology
2 Research Institute of Petroleum Industry (RIPI)
چکیده [English]

In recent years, using natural gas hydrates (NGH) for storage and transportation of gas has been considered because gas hydrates can be stored and transported at temperatures much higher than liquefied natural gas (LNG). The major objective of this study is to investigate the effects of non-ionic surfactants polysorbate 80 (Tween-80) and polysorbate 20 (Tween-20) on the formation rate and storage capacity of methane hydrate. Tween-20 was tested with 2 concentrations of 1000 and 2000 and Tween-80 was tested with 100 and 500 ppm and compared with the hydrate formed in pure water and aqueous sodium dodecyl sulfate (SDS) solution. The hydrate formation rate and the storage capacity were influenced by the different concentrations of surfactants and it was found that Tween-20, when prepared with 2000 ppm, speeded up the hydrate formation rate and increased its storage capacity; but when it was prepared with 1000 ppm, it inhibited the hydrate formation effectively. Tween-80 decreased the hydrate formation rate in both of the solutions. Experimental results on hydrate gas content revealed that the maximum storage capacity of 125 V/V is obtained with 2000 ppm of Tween-20 in water.

کلیدواژه‌ها [English]

  • Gas Hydrates
  • Non-ionic Surfactants
  • Formation Rate
  • Storage Capacity
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