بررسی تجربی تأثیر سدیم سولفیت، دی‌سدیم تارتارات دی‌هیدرات و سدیم دی‌هیدروژن فسفات در جداسازی اسید لاکتیک به‌روش سامانه‌های دوفازی آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد مهندسی شیمی، دانشگاه گیلان

2 دکتری مهندسی شیمی، دانشگاه گیلان

3 استاد مهندسی شیمی، دانشگاه گیلان

چکیده

از اهداف پژوهش حاضر، محاسبۀ ضریب توزیع اسید لاکتیک در سامانۀ دوفازی آبی پلی‌اتیلن گلیکول- نمک‌های فسفات است؛ بنابراین، درجۀ حرارت‌های 25، 30، 35 و 40 سلسیوس تعیین و در هر یک از درجۀ حرارت، انواع نمک‌های فسفات مانند سدیم سولفیت، دی‌سدیم تارتارات دی‌هیدرات و سدیم دی‌هیدروژن فسفات و نیز جرم مولکولی متفاوت پلی‌اتیلن گلیکول با غلظت وزنی 30 درصد (4000 و 8000 گرم بر مول) ارزیابی شد. به‌علاوه، بازدهی استخراج اسید در اسیدیته‌های گوناگون در بازه 5 تا 9 آزمایش شد. تأثیر جرم مولکولی پلی‌اتیلن گلیکول، نوع نمک، غلظت نمک و تغییر دما بر روی بازدهی استخراج بررسی شد. با توجه به نتایج، با بالا رفتن جرم مولکولی پلی‌اتیلن گلیکول، درجۀ حرارت، غلظت نمک و pH، مقادیر بازدهی استخراج نزول پیدا می‌کند. اعداد مطلوب جرم مولکولی پلی‌اتیلن گلیکول، درجۀ حرارت، مقدار نمک و اسیدیته به‌ترتیب 4000 گرم بر مول، 25 درجۀ سلسیوس، 25 درصد وزنی سدیم سولفیت، دی‌سدیم تارتارات دی‌هیدرات و سدیم دی‌هیدروژن فسفات و 5/5 تا 5/6 تعیین شد.
در نهایت، بازدهی استخراج سدیم سولفیت، دی‌سدیم تارتارات دی‌هیدرات و سدیم دی‌هیدروژن فسفات به‌ترتیب 205/53، 149/50 و 549/19 درصد حساب شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Study of the Effect of Sodium Sulfite, Disodium Tartrate Dihydrate and Sodium Dihydrogen Phosphate on the Separation of Lactic Acid by Aqueous Two-Phase Systems

نویسندگان [English]

  • Sh. Abrchi 1
  • H. Masoumi 2
  • H. Ghanad Zadeh Gilani 3
1 M. Sc. of Chemical Engineering, University of Guilan
2 Ph. D. of Chemical Engineering, University of Guilan
3 Professor of Chemical Engineering, University of Guilan
چکیده [English]

The aim of this study was to investigate the distribution of lactic acid in polymer-salt aqueous two phase systems. Accordingly, four temperatures of 25, 30, 35 and 40°C were considered and at each temperature, three different salts including sodium sulfite, disodium tartrate dihydrate and sodium dihydrogen phosphate and two different molecular masses of polyethylene glycol 30% by weight (4000 and 8000 g/mol) was tested in aqueous two-phase system. Also, the percentage of acid extraction at pH 5 to 9 and the effect of polymer concentration were investigated.
The effect of polymer molecular mass, polymer concentration, salt type, salt concentration and temperature change on the extraction percentage was evaluated. It was observed that in all three systems, with increasing the molecular weight of the polymer, temperature, salt concentration, polymer concentration and pH, the extraction efficiency decreases.
The optimum values of polymer molecular weight, temperature, salt concentration and pH were determined as 4000 g/mol, 25 °C, 25% by weight of sodium sulfite, disodium tartrate dihydrate and sodium dihydrogen phosphate and 5.5 to 6.5, respectively. In addition, the optimal polymer concentration was determined to be 30% by weight. Finally, the extraction values for sodium sulfite, disodium tartrate dihydrate and sodium dihydrogen phosphate were calculated to be 53.205, 50.149 and 19.549%, respectively.

کلیدواژه‌ها [English]

  • Lactic Acid
  • PEG 4000 & 8000 g/mol
  • Aqueous Two Phase System
  • Sodium Salts

مراجع

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مهندسی شیمی ایران
دوره 22، شماره 126 - شماره پیاپی 126
فروردین و اردیبهشت 1402
صفحه 7-19

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