Preparation of Large Size Microcapsules Containing Tri-<i>n</i>-octylamine by <i>In situ</i> Polymerization Combined with a Gel Inclusion Method and Their Extraction Behavior

Abstract

Large size microcapsules containing tri-n-octylamine (TOA) with a diameter of larger than 2 mm were prepared by in situ polymerization with a gel inclusion of an organic droplet. A copolymer of styrene and divinylbenzene was used as the capsule wall material. When the concentration of TOA was high, the structure of the microcapsules was mono-cored with a thin wall and large cavity. However, at low TOA concentration, the structure changed to a matrix type filled with the copolymer. The TOA content in the microcapsules increased linearly with the initial TOA concentration in the organic phase until 60wt%. The extraction of acetic acid into the microcapsules was successfully carried out. It was possible to reuse the microcapsules 4 times and the extracted amount of acetic acid into the microcapsules was constant during their reuse.

Zn(II) Sorption From Aqueous Solutions Using Polymeric MicrocapsulesContaining 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester

“…Recently, the microencapsulation of ion-exchangers has been studied in hydrometallurgy for the uptake of several heavy metals from various aqueous solutions using different microcapsule preparation methods [17][18][19]. Here, we have employed a chemical method based on an in situ polymerisation by mixing the monomers required to prepare the polymeric matrix and the initiator of the reaction with the extractant in an appropriate solvent.…”

Extraction Properties of Nickel (II) with Polymeric Particles with Interconnected Spherical Pores Impregnating with LIX84-I

“…To solve these problems, the immobilization of the extractant [2][3][4][5][6][7][8] and microencapsulation [9][10][11][12][13][14][15][16][17][18][19][20][21][22] of the extractant have been investigated. The immobilization of the extractant is achieved using porous polymer particles [2][3][4][5][6] and in some cases using fibers [7,8].…”

Preparation of Microcapsules Containing PC-88A with Interconnected Spherical Pores and Their Extraction Properties for Zn(II)

“…To solve these problems, the immobilization of the extractant [2][3][4][5] and microencapsulation of the extractant have been investigated. Microcapsules encapsulating extractants used in solvent extraction systems are expected to be effective separation media for various substances such as metal ions [6][7][8][9][10][11][12][13][14][15], organic acids [16][17][18][19][20], antibiotics [21][22][23], and environmentally hazardous substances [24][25][26], because of the high separation properties of the encapsulated extractants, which have been proven in solvent extraction systems, and because of the high capacity for the extracted chemicals in the interior of the microcapsules. Furthermore, continuous separation is also possible by using a column packed with microcapsules containing extractants [27,28].…”