Investigation of Crystal Size Distribution in Purification of Terephthalic Acid from Polyester Textile Industry Waste by Reactive Crystallization

Bekti Marlena; Hary Sulistyo; Rochmadi Rochmadi

doi:10.22146/ijc.80820

Investigation of Crystal Size Distribution in Purification of Terephthalic Acid from Polyester Textile Industry Waste by Reactive Crystallization

https://doi.org/10.22146/ijc.80820

Bekti Marlena^(1*), Hary Sulistyo⁽²⁾, Rochmadi Rochmadi⁽³⁾

(1) Department of Chemical Engineering, Universitas Gadjah Mada, Jl. Grafika 2, Yogyakarta 55284, Indonesia; Center for Standardization and Industrial Pollution Prevention Services, Jl. Kimangunsarkoro No. 6, Semarang 5013, Indonesia
(2) Department of Chemical Engineering, Universitas Gadjah Mada, Jl. Grafika 2, Yogyakarta 55284, Indonesia
(3) Department of Chemical Engineering, Universitas Gadjah Mada, Jl. Grafika 2, Yogyakarta 55284, Indonesia
(*) Corresponding Author

Abstract

The purification of terephthalic acid recovered from an alkali-reduction wastewater by reactive crystallization was investigated. The crude terephthalic acid was reacted with sodium hydroxide solution to form a salt of disodium terephthalate, then acidified with sulfuric acid to get the terephthalic acid with higher purity. Effects of time, pH, concentration, and flow rate of secondary feed solutions, temperature, and stirring rate on Crystal Size Distribution (CSD) of terephthalic acid precipitate were investigated. The results showed that CSD was influenced by the concentration of reactants and the pH solution. On the other hand, time, temperature, flow rate of secondary solution, and stirring rate had no significant effects on the CSD, which the mean size of crystals ±3 μm. The mean size of crystals at solution pH 5, 4, and 3 were 6.03, 9.42, and 10.34 μm, respectively; meanwhile, at concentrations of 0.5, 0.3, and 0.1 M, were 7.57, 3.24, and 3.09 μm, respectively. The semi-batch reactive crystallization with double-feeding at constant pH and temperature produced monodispersed crystals. However, this method needs to be carried out more than once for terephthalic acid purification, which is intended for polyethylene terephthalate (PET) polymerization.

Keywords

crystal size distribution; purification; reactive crystallization; terephthalic acid

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DOI: https://doi.org/10.22146/ijc.80820