EVALUASI PERFORMANCE REGENERASI MIXED BED POLISHER PADA UNIT DEMINERALISASI

One of the important elements produced from the factory support units is air products. Regional water balance (integration) is important to support factory operations. Raw water is treated in the unit section to produce demin water and further process into Boiler Feed Water (BWF) to produce 80 kg/cm2 pressurized steam in the boiler unit, to meet the specifications as demin water it is necessary to carry out several treatments to remove mineral ions (cations and anions) dissolved in the air. In the mixed bed polisher, there is a resin regeneration process to eliminate saturation of the resin which can no longer bind mineral ions. Regeneration or regent is carried out after the resin pile is saturated which is characterized by an increase in product productivity conductivity with the desired product conductivity target of <0.2 μS/cm at a temperature of 25℃. The purpose of this study was to work or perform a mixed bed polisher, especially during regeneration in the demineralization unit. This research was conducted by making a framework of thought and writing work. The writing stage contains data collection, data processing and data analysis-synthesis, as well as drawing conclusions. Based on this research, the results showed that there was a decrease in the performance of the mixed bed with a bed expansion gain of 80.7% and a resin height of 2.42 m. The number of chemicals used for regeneration is 1170.7 kg consisting of HCL and NaOH so that the flow rate of demin water required to dilute the regenerant is 7,126 m3/h. Keywords: Mixed bad Polisher, Demin water, Resin regeneration.

Optimasi Biaya dalam Proses Pemurnian Metanol untuk Mengurangi Resin sebagai Limbah Bahan Berbahaya dan Beracun di PT Kaltim Methanol Industri

Purification process of raw methanol from its impurities to produce pure methanol at PT. Kaltim Methanol Industri (PT KMI) is carried out by several steps, including degassing, distillation, and adsorption. One of the impurities, tri methyl amine (TMA), could be removed by adding NaOH. Another method to remove TMA is conducted by adsorption process on ion exchange resin on the vessel called TMA catchpot. The TMA catchpot performance is very crucial in methanol purification process. Thus, monitoring and optimization are required to be performed regularly. Once the TMA catchpot resin has exhausted, the performance will be drop and methanol purification could not be done efficiently. Furthermore, the ion exchange resin should be replaced with new resin. This study evaluates the performance of the TMA catchpot during the charge of 2010, 2012, and 2016, calculates the NaOH consumption during operational time, and optimizes the cost. Resin regeneration option was introduced and compared with the conventional method (i.e. resin replacement). Economic evaluation shows that the lowest annual cost could be obtained by fresh resin replacement every 4 years and resin regeneration every 2 years. Resin regeneration option gives not only annual cost reduction, but also positive impact to the environment, by decreasing the amount of hazardous waste (i.e. spent resin) significantly.Keywords: ion exchange resin; methanol purification; regeneration; tri methyl amineA B S T R A KProses pemurnian metanol mentah (raw) dari pengotornya untuk menghasilkan metanol murni di PT. Kaltim Methanol Industri (PT KMI) dilakukan melalui beberapa tahapan antara lain degassing, distilasi dan adsorpsi. Salah satu zat pengotor adalah tri methyl amine (TMA) yang dapat dihilangkan dengan penambahan NaOH. Metode lain untuk menghilangkan TMA adalah dengan proses adsorpsi menggunakan resin penukar ion di dalam tangki yang disebut TMA catchpot. Performa TMA catchpot sangat penting dalam proses pemurnian metanol. Oleh karena itu, pemantauan dan optimalisasi perlu dilakukan secara berkala. Setelah resin pada TMA catchpot jenuh, performanya akan menurun dan pemurnian metanol tidak dapat dilakukan secara efisien. Selanjutnya, resin penukar ion harus diganti dengan resin baru. Artikel ini mengevaluasi kinerja catchpot TMA pada penggantian resin (charge) 2010, 2012 dan 2016, menghitung konsumsi NaOH sebagai fungsi waktu operasi, dan mengoptimasi biaya pemurnian. Selain itu, disimulasikan opsi regenerasi resin, sebagai pembanding metode konvensional (penggantian resin). Evaluasi ekonomi menunjukkan bahwa biaya tahunan paling rendah didapatkan dengan penggantian resin baru setiap 4 tahun, dan regenerasi resin setiap 2 tahun. Selain biaya tahunan yang rendah, regenerasi ini berdampak positif terhadap lingkungan dengan mengurangi timbulan limbah B3 (resin bekas) secara signifikan.Kata kunci: pemurnian metanol; regenerasi; resin penukar ion; tri metil amin

Recovery of Lanthanum(III) and Nickel(II) Ions from Acidic Solutions by the Highly Effective Ion Exchanger

The recovery of La(III) and Ni(II) ions by a macroporous cation exchanger in sodium form (Lewatit Monoplus SP112) has been studied in batch experiments under varying HNO3 concentrations (0.2–2.0 mol/dm3), La(III) and Ni(II) concentrations (25–200 mg/dm3), phase contact time (1–360 min), temperature (293–333 K), and resin mass (0.1–0.5 g). The experimental data revealed that the sorption process was dependent on all parameters used. The maximum sorption capacities were found at CHNO3 = 0.2 mol/dm3, m = 0.1 g, and T = 333 K. The kinetic data indicate that the sorption followed the pseudo-second order and film diffusion models. The sorption equilibrium time was reached at approximately 30 and 60 min for La(III) and Ni(II) ions, respectively. The equilibrium isotherm data were best fitted with the Langmuir model. The maximum monolayer capacities of Lewatit Monoplus SP112 were equal to 95.34 and 60.81 mg/g for La(III) and Ni(II) ions, respectively. The thermodynamic parameters showed that the sorption process was endothermic and spontaneous. Moreover, dynamic experiments were performed using the columns set. The resin regeneration was made using HCl and HNO3 solutions, and the desorption results exhibited effective regeneration. The ATR/FT-IR and XPS spectroscopy results indicated that the La(III) and Ni(II) ions were coordinated with the sulfonate groups.