Most of the cellulose acetate (CA) membrane for desalination process was prepared by using the phase inversion method. In this study, CA was modified by poly(1,4-butylene succinate) (PBS) with the addition of PBS was 0-40 wt% of the total material used (CA and PBS). CA/PBS membranes have been prepared by using the phase inversion method with the variation of solvents used. The membrane of CA/PBS was prepared by using dimethylformamide (DMF), N-methyl-2pyrrolidone (NMP), and tetrahydrofuran

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... , respectively of which each of the solvents was mixed with acetone in the ratio of 50:50. The hydrophilicity of membranes was characterized by using Fourier Transform Infra-Red (FTIR) and water content. Scanning Electron Microscope (SEM) was used to observe the morphology of the membranes. Salt rejection and permeate flux was analyzed to observe membrane performance. The experiment results show no tendency was shown from the results either in its hydrophilicity or permeate flux. The morphology of membranes shows finger-like and spongelike structures. For all variables of solvents used, salt rejection of membranes increased with the addition of PBS, of which the highest order was obtained from acetone, acetone/NMP, acetone/DMF, and acetone/THF. The best performance of membrane was prepared in acetone CA/PBS 90/10 with the salt rejection of 75% and permeate flux of 1956.52 L/m 2 h. Sebagian besar membran selulosa asetat (CA) untuk proses desalinasi dibuat dengan menggunakan metode inversi fasa. Dalam penelitian ini, CA dimodifikasi oleh poli(1,4-butilena suksinat) (PBS) dengan penambahan PBS 0-40% berat dari total bahan yang digunakan (CA dan PBS). Membran CA/PBS dipreparasi menggunakan metode inversi fasa dengan variasi pelarut yang digunakan. Membran CA/PBS dibuat dengan menggunakan dimethylformamide (DMF), N-methyl-2pyrrolidone (NMP), dan tetrahydrofuran (THF), dimana masing-masing pelarut dicampur dengan aseton dengan perbandingan 50:50. Hidrofilisitas membran dikarakterisasi dengan menggunakan Fourier Transform Infra-Red (FTIR) dan uji kadar air. Scanning Electron Microscope (SEM) digunakan untuk mengamati morfologi membran. Salt rejection dan permeate flux dianalisis untuk mengamati kinerja membran. Hasil percobaan tidak menunjukkan kecenderungan baik dalam hidrofilisitas maupun permeate flux. Morfologi membran menunjukkan struktur seperti jari dan seperti spons. Untuk semua variabel pelarut yang digunakan, salt rejection terhadap membran meningkat dengan penambahan PBS, dimana urutan tertinggi diperoleh dari aseton, aseton/NMP, aseton/DMF, dan aseton/THF. Kinerja membran terbaik didapat dengan preparasi dalam aseton CA/PBS 90/10 dengan salt rejection 75% dan permeate flux 1956,52 L/m 2 h.