Urea adalah senyawa organik yang tersusun dari unsur karbon, hidrogen, oksigen dan nitrogen dengan rumus CON2H4 atau (NH2)2CO. Pabrik Urea Kaltim-1A menggunakan proses Stamicarbon “overall recycle CO2 stripping�?dengan memanfaatkan Ammonia cair dan CO2 yang diproduksi oleh unit Ammonia Kaltim-1A. Unit sintesa ialah suatu unit yang penting dalam proses pembuatan urea. Dalam penelitian ini permasalahan yang diangkat ialah mengevaluasi efisiensi reaktor urea pada berbagai tingkatan amount didalam reaktor dengan membandingkan hasil perhitungan teoritis dengan aktual yang ada di pabrik guna untuk melihat kondisi reaktor saat ini.
Pada penelitian ini digunakan diagram kontrol kombinasi MEWMA yaitu dengan diagram kontrol M2Z2 untuk memonitor variabilitas proses dan diagram kontrol MZ untuk memonitor target proses. Hasil monitoring fase I pabrik 1B menunjukkan bahwa variabilitas proses dan goal proses sudah terkendali secara statistik baik menggunakan batas kontrol dengan kriteria ATS maupun ARL, dan pada fase II menunjukkan variabilitas proses dan focus on proses belum terkendali statistik atau belum stabil baik menggunakan b...
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