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

https://doi.org/10.22146/jrekpros.59553

Reno Imam Arthapersada(1), Muhammad Kurniawan Adiputra(2), Indra P Hakim(3), Imam Karfendi Putro(4), Asep P Zainuddin(5), Lisendra Marbelia(6), Ahmad Tawfiequrahman Yuliansyah(7*)

(1) PT. Kaltim Methanol Industri, Komplek Kaltim Industrial Estate, Bontang, Kalimantan Timur
(2) PT. Kaltim Methanol Industri, Komplek Kaltim Industrial Estate, Bontang, Kalimantan Timur
(3) PT. Kaltim Methanol Industri, Komplek Kaltim Industrial Estate, Bontang, Kalimantan Timur
(4) PT. Kaltim Methanol Industri, Komplek Kaltim Industrial Estate, Bontang, Kalimantan Timur
(5) PT. Kaltim Methanol Industri, Komplek Kaltim Industrial Estate, Bontang, Kalimantan Timur
(6) Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada, Jl Grafika No 2 Kampus UGM, 55281 Yogyakarta
(7) Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada, Jl Grafika No 2 Kampus UGM, 55281 Yogyakarta
(*) Corresponding Author

Abstract


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 amine


A B S T R A K

Proses 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


 


Keywords


ion exchange resin; methanol purification; regeneration; tri methyl amine

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DOI: https://doi.org/10.22146/jrekpros.59553

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