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. 2019 Jan 22;24(3):403. doi: 10.3390/molecules24030403

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Response surface and contour plots showing (a) the effects of mass fraction of (NH₄)₂SO₄ (A, %) and amount of t-butanol (B, mL) on the EY of IOPS (Y, %); (b) the effects of mass fraction of (NH₄)₂SO₄ (A, %) and temperature (C, °C) on the EY of IOPS (Y, %); and (c) the effects of the amount of t-butanol (B, mL) and temperature (C, °C) on the EY of IOPS (Y, %).

Response surface and contour plots showing (a) the effects of mass fraction of (NH₄)₂SO₄ (A, %) and amount of t-butanol (B, mL) on the EY of IOPS (Y, %); (b) the effects of mass fraction of (NH₄)₂SO₄ (A, %) and temperature (C, °C) on the EY of IOPS (Y, %); and (c) the effects of the amount of t-butanol (B, mL) and temperature (C, °C) on the EY of IOPS (Y, %).