حذف یون سولفید از محلول هیدروکسید سدیم به‎روش ازن‎زنی- جذب سطحی

نوع مقاله: مقاله پژوهشی

نویسنده

دانشکده نفت و پتروشیمی، دانشگاه رازی، کرمانشاه، ایران

10.22078/pr.2018.3292.2520

چکیده

بازیافت محلول قلیایی هیدروکسید سدیم مصرفی در جذب سولفید هیدروژن از گاز ارسالی به مشعل از جمله عوامل بازدارنده در استفاده از این جاذب قوی در صنایع نفت و گاز به‎شمار می‎رود، زیرا در فرآیند جذب، سولفید سدیم در یک واکنش بازگشت‎ناپذیر بین سولفید هیدروژن و محلول هیدروکسید سدیم تولید می‎شود. در تحقیق پیش‎رو، از فرآیند ترکیبی دو مرحله‎ای (در pH ثابت) شامل اکسیداسیون با گاز ازن به منظور تبدیل یون گوگرد (سولفید) به یون سولفات و جذب سطحی با زئولیت طبیعی (کلینوپتیلولیت) برای جداسازی یون سولفات از محلول و بازیابی هیدروکسید سدیم مصرفی استفاده گردید. برای این منظور، محلول قلیایی سولفید سدیم در هیدروکسید سدیم تهیه و تاثیر سه متغیر زمان ازن‎زنی، حجم آب اکسیژنه و غلظت اولیه سولفید سدیم در سه سطح بر بازده تبدیل یون سولفید به سولفات بررسی شد. آزمایش‎های اکسیداسیون مطابق الگوی پیشنهادی در نرم‎افزار Design Expert انجام و شرایط بهینه به‎روش سطح پاسخ تعیین گردید. در شرایط بهینه (حداکثر سطح متغیرها) مقدار بازدهی تبدیل معادل 11/72% به‎دست آمد. در مرحله بعدی آزمایش‎ها و برای حذف یون سولفات تولید شده در مرحله اکسیداسیون، از عملیات جذب سطحی بر‎روی زئولیت طبیعی و اصلاح شده با کلرید باریم استفاده شد. بالاترین بازده جذب یون سولفات (91%) برروی زئولیت اصلاح شده و در بیشترین سطح مقدار زئولیت مصرفی حاصل گردید. فرآیند ترکیبی اکسیداسیون- جذب سطحی با بازده حذف یون سولفید به مقدار 7/65% و بدون کاهش قابل توجه قلیایت محلول، می‎تواند به‎عنوان گزینه‎ای قابل بررسی جهت جایگزینی هیدروکسید سدیم به‎جای اتانول آمین‎ها در صنایع نفت و گاز معرفی شود.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Sulfide Ion Removal from Sodium Hydroxide Solution by Ozonation/Adsorption Method

نویسنده [English]

  • Jamshid Behin
Faculty of Petroleum and Chemical Engineering, Razi University, Kermanshah, Iran
چکیده [English]

One of issues preventing utilization of sodium hydroxide, as H2S absorbent in this oil/gas industries, is its recovery, because of an irreversible reaction between NaOH and H2S. In this work, ozone and natural zeolite (clinoptilolite) were used for oxidation of sulfide to sulphate ions and adsorption of sulfate ions from alkaline solution, respectively. A synthetic solution of sodium sulfide in sodium hydroxide was prepared. The effect of three operating variables at three levels including ozonation time, hydrogen peroxide dosage, and initial concentration of sodium sulfide was investigated on conversion of sulfide ion to sulfate ion. The design of experiments was performed utilizing response surface method (RSM) in Design Expert software to find optimum condition of oxidation process. Under optimum condition, i.e., ozonation time: 60 min, hydrogen peroxide dosage: 5 mL and sodium sulfide concentration: 0.03 M, a conversion 72.11% was achieved. In the next step of experimental runs and for the removal of produced sulfate ion in oxidation step, an adsorption process using natural zeolite and surface modified zeolite with barium chloride was applied. The highest adsorption efficiency of sulfate ion (91%) was achieved at the highest level of modified zeolite dosage (8 g zeolite/100 mL of solution). Total removal efficiency 65.7% was reported in whole process of oxidation-adsorption, whereas no significant changes in pH were observed. The present method could be a notable alternative to replace ethanol amines with NaOH solution in oil and gas industries.
 

کلیدواژه‌ها [English]

  • Adsorption
  • Clinoptilolite Zeolite, Flare Gas, Hydrogen Sulfide, Ozonation

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