ABSTRAK
Carbon loss dengan besar lebih dari 65% menjadi kendala utama dalam produksiCNT skala pilot menggunakan reaktor gauze. Identifikasi carbon loss dilakukan denganmenganalisis kemungkinan penyebab carbon loss seperti error pada pengukuran lajualir produk, evaluasi perubahan laju alir umpan karena adanya katalis dan penumbuhanCNT dalam reaktor, analisis komposisi gas produk dengan GC FID dan kemungkinanterbawanya karbon sebagai partikulat dalam aliran produk. Hasil penelitian menunjukkanbahwa carbon loss awal sebelum dianalisis dengan metoda diatas jauh lebih kecil daripenelitian sebelumnya yaitu 27,64%. Hal ini dikarenakan laju alir umpan telahdikalibrasi dengan kondisi reaktor berisi katalis bukan reaktor kosong. Carbon lossmencapai 69,14% jika laju umpan yang digunakan pada perhitungan adalah hasilkalibrasi saat reaktor kosong. Adanya katalis menyebabkan laju alir umpan yang masuklebih kecil 28% dari saat kondisi kosong. Error laju alir produk karena pengukurandengan bubble soap memberikan error perhitungan carbon loss ± 4,14%. Perubahan lajualir umpan karena penumbuhan CNT dalam reaktor mengurangi besarnya carbon losssebanyak 4,97%. Sedangkan terdeteksinya hidrokarbon skunder dengan GC FID selamaproduksi CNT berlangsung mengurangi carbon loss sebesar 5,41%. Selain itu, partikulatyang terbawa oleh aliran produk sangat sedikit dan hanya mengoreksi carbon loss sebesar0.05%.Dengan memperhitungkan semua faktor diatas, besarnya carbon loss padapenelitian ini adalah (16,23 ± 4,14)%. Jika diasumsikan 4,14% carbon loss disebabkanoleh error selama pengukuran laju produk maka besarnya carbon loss adalah 12,09% .Artinya lebih dari 57% carbon loss pada penelitian ini telah teridentifikasi.

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Abstract
Carbon loss by more than 65% was the major obstacles to the pilot-scaleproduction of CNTs using gauze reactor. Therefore in this study, to be identified byanalyzing the possible causes of carbon loss, such as error of product flow rate due tomeasurement of bubble soap and possible of feed flow rate changes due to the catalystpresence and the CNT growth in the reactor, analysis of product composition by GC FIDand analysis the possibility of particulate carbon in gas products was identified too byusing glass fiber filters. The results showed that the initial carbon loss calculation beforeprior to be analized by the above method was much smaller than previous studies, namely27.64%. This is because feed flow rate has been calibrated with the condition of thereactor containing the catalyst instead of an empty reactor. Carbon loss will reach 69.14%if the feed rate used in the calculation was calibration results when the reactor is empty.This is because the catalyst in the reactor led to feed flow rate less 28% of the totaldischarge current when the empty reactor. Product flow rate error due to measurement ofbubble soap give error in the carbon loss calculation up to ± 4.14%. Changes in feed flowrate because the growth of CNTs in the reactor reduce the amount of carbon loss as muchas 4.97%. While the detection of secondary hydrocarbons by GC FID during CNTproduction reduces carbon loss up to 5,41%. In addition, particulate matter carried by theflow of products is very little and only give carbon loss corrected for 0.05%. Taking intoaccount all the factors above, the amount of carbon loss in this study were 16.23 ± 4.14%.If we assume 4,14& carbon loss was caused by error occurred during the study, theamount of carbon loss is 12.09%. This means that more than 57% carbon loss in thisstudy have been identified.