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The Utilization of Papaya Leaf Extract as Organic Inhibitor in Tube Heat Exchanger in 3.56% NaCl Solution

Tugas Akhir, 029 / 2020 / TKI
Undergraduate Theses from JBPTPPOLBAN / 2021-08-04 11:21:32
Oleh : Muhammad Nur Missuari - 171411054 & Yasir Mohammad Naufal Attamimi - 171411064 (muhammad.nur.tkim17@polban.ac.id)
Dibuat : 2021-08-04, dengan 4 file

Keyword : double pipe heat exchanger, maceration, papaya leaf extract inhibitor, corrosion rate, inhibitor efficiency.
Subjek : double pipe heat exchanger, maserasi, inhibitor ekstrak daun pepaya, laju korosi, efisiensi inhibitor.

Double Pipe Heat Exchanger (DPHE) merupakan peralatan yang banyak digunakan di industri. Pipa bagian dalam dapat terkorosi dengan cepat apabila berkontak langsung dengan larutan yang korosif seperti larutan NaCl 3,56%. Inhibitor organik berupa ekstrak daun pepaya yang mengandung senyawa antioksidan yang mengandung tanin dapat digunakan untuk mengendalikan laju korosi, sehingga umur pipa DPHE dapat berfungsi lebih lama. Tujuan penelitian ini yaitu menentukan konsentrasi terbaik inhibitor ekstrak daun pepaya (Carica papaya) yang dapat menurunkan laju korosi pada pipa baja karbon rendah dalam lingkungan larutan NaCl 3,56%. Pada peralatan DPHE tube yang diteliti yaitu pipa baja karbon rendah di lingkungan larutan NaCl 3,56%. Ekstrak daun pepaya diperoleh dari proses maserasi selama 24 jam menggunakan pelarut etanol 70 % dengan rasio solute dan solvent 1:8 pada suhu kamar. Hasil ekstraksi dianalisis secara kualitatif dengan metode fitokimia yaitu menambahkan FeCl3 pada ekstrak daun pepaya yang menghasilkan perubahan warna dari coklat kehitaman menjadi hitam kehijauan. Perubahan warna menunjukan adanya senyawa tanin dalam ekstrak daun pepaya. Pengujian korosi dilakukan dengan mengontrol suhu aliran panas bagian luar pipa sebesar 45oC sampai 55oC, konsentrasi inhibitor 300 ppm, 600 ppm, 900 ppm, dan dilakukan selama 36 jam dengan rentang waktu pengukuran massa logam setiap 6 jam. Proses korosi yang berlangsung dihitung laju korosinya dengan menggunakan metode pengurangan berat. Hasil penelitian menunjukan bahwa inhibitor ekstrak daun pepaya dapat menurunkan laju korosi pipa baja logam yang dialiri larutan NaCl 3,56% sebagai pipa dalam dengan konsentrasi inhibitor 300 ppm, 600 ppm, dan 900 ppm memiliki laju korosi berturut-turut sesuai konsentrasi inhibitor 0,878 mmpy, 0,585 mmpy, dan 0,414 mmpy. Laju korosi yang diperoleh sebelum ditambahkan inhibitor yaitu sebesar 1,024 mmpy. Laju korosi dengan inhibitor 900 ppm merupakan yang paling rendah. Efisiensi inhibitor daun pepaya dengan konsentrasi berturut-turut (300 ppm, 600 ppm, dan 900 ppm) adalah sebesar (14,29%, 42,86%, dan 59,52%). Efisiensi tertinggi inhibitor ekstrak daun pepaya sebesar 59,52%.

Deskripsi Alternatif :

Double Pipe Heat Exchanger (DPHE) is equipment that is widely used in industry. The inner pipe corrodes rapidly when in direct contact with a corrosive solution such as a 3.56% NaCl solution. Organic inhibitor in the form of papaya leaf extract containing antioxidant compounds containing tannins can be used to control the corrosion rate, so that the life of the DPHE pipe can function longer. The purpose of this study was to determine the best concentration of papaya leaf extract inhibitor (Carica papaya) which can reduce the corrosion rate of low carbon steel pipes in an environment of 3.56% NaCl solution. In the DPHE tube equipment studied were low carbon steel pipes in the environment of 3.56% NaCl solution. Papaya leaf extract was obtained from a maceration process for 24 hours using 70% ethanol with a solute and solvent ratio of 1: 8 at room temperature. The extraction results were analyzed qualitatively with the phytochemical method, namely adding FeCl3 to the papaya leaf extract which resulted in a color change from blackish brown to greenish black. The color change indicates the presence of tannin compounds in papaya leaf extract. Corrosion testing is carried out by controlling the temperature of the heat flow outside of the pipe by 45oC to 55oC, the inhibitor concentration of 300 ppm, 600 ppm, 900 ppm, and is carried out for 36 hours with a time span of measuring the mass of metal every 6 hours. The corrosion process that takes place is calculated the rate of corrosion using the weight reduction method. The results showed that the papaya leaf extract inhibitor could reduce the corrosion rate of metal steel pipes which were fed with 3.56% NaCl solution as an inner tube with an inhibitor concentration of 300 ppm, 600 ppm, and 900 ppm had a corrosion rate according to the inhibitor concentration of 0.878 mmpy, respectively. 0.585 mmpy, and 0.414 mmpy. The corrosion rate obtained before adding the inhibitor is 1.024 mmpy. The corrosion rate with an inhibitor of 900 ppm is the lowest. The efficiency of the papaya leaf inhibitor with the consecutive concentrations (300 ppm, 600 ppm, and 900 ppm) was (14.29%, 42.86%, and 59.52%). The highest efficiency of papaya leaf extract inhibitor was 59.52%.

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