Kerja praktek saya di PT.Ch*nd*a A*ri Petr*chem*cal Tbk (PT. CAP) menuai banyak pengalaman berharga, sehingga saya bisa
membandingkan ilmu yang saya dapat di kuliah dengan kenyataan yang ada di
lapangan. PT. CAP bergerak dibidang pengolahan turunan minyak bumi
menjadi polimer plastik. Pabrik ini beroperasi dengan kapasitas yang besar
600.000 ton/tahun dan harus mensuplai industri2 hilir di Indonesia. PT.
CAP ini merupakan gabungan dari 2 perusahaan yaitu PT.Ch*nd*a A*ri Petr*chem*cal Tbk mengolah
ethylene dan PT.Tryp*lita mengolah propylene. Karena ingin menunjang semboyan
menuju world class company akhirnya kedua perusahaan merger. Pabrik ini menjadi
satu2nya di Indonesia yang mengolah turunan minyak bumi menjadi polimer
plastik.
"My internship in PT.Ch*nd*a A*ri Petr*chem*cal Tbk (PT. CAP) get a lot of valuable experience, so that I can
compare knowledge in my study in campus with reality in the line or
industries. PT. CAP is moving sector in processing plastic polymer from
derivative of petroleum. This plant has operation with large capacity about
600.000 tons/years and must the supply downstream industries in
Indonesia. PT. CAP is merger of 2 companies such as PT. Chandra Asri has
process ethylene and PT.Trypolita has process prophylene. Because both
compabies same purpose want to support slogan "world class company"
finally, both companies merger. This company is one in Indonesia industries
which processing derivative petroleum become plastic polymer."
Pada pengolahannya terdapat 2 proses polimer yaitu
polimer kondensasi (reaksi disertai pembentukan H2O) dan polimer addisi (reaksi
disertai pemutusan ikatan rangkap). Ada 3 macam produk yang dihasilkan yaitu LDPE
(Low Density Poly Ethylene), LLDPE (Low Linear Density Poly Ethylene) dan
HDPE (High Density Poly Ethylene), yang membedakan dari semuanya
adalah densitasnya yang mempengaruhi terhadap rantainya.
"In the processing there are 2
processes polymer such as condensation polymer (reaction and accompanied
formation H2O) and addition polymer (reaction and accompanied breaking of
bonds). There are 3 kinds product produced by this plant such as LDPE (Low
Density Poly Ethylene), LLDPE (Low Linear Density Poly Ethylene) dan HDPE
(High Density Poly Ethylene), differences of all this is density, which
it is affects to the molecule chain."
Kebetulan saya ditempatkan di seksi LLDPE plant.
Disini saya belajar tentang proses produksi dan kontrol proses. Tiap hari
bersama engineer lapangan dijelaskan ke plant mengenai fungsi alat dan cara
kerjanya. Selama 1 bulan banyak pengetahuan saya dapatkan, karena saya bisa
membandingkan antara ilmu yang saya dapatkan di kuliah dengan kenyataan yang
ada di lapangan. Saya diberi tugas menganalisa kinerja dari compressor dan
cooler. Dari hasil analisa dan perhitungan bahwa kinerja kedua alat telah
berkurang, dan saya simpulkan ada hal-hal yang membuat bisa begitu, salah
satunya ada seal valve ada yang rusak utk compressor dan adanya kerak
pada shell and tube cooler. LLDPE adalah salah satu hasil produk dari pabrik
ini, dimana itu merupakan polimer termoplastik dan banyak digunakan dalam
industri hilir seperti industri botol kemasan, tas plastik, tekstil, pupuk dll.
Polimer dibagi menjadi 2 berdasarkan sifatnya thd
panas yaitu :
- Polimer Termosetting (bahan yang dipanaskan meleleh dan mengeras tapi tidak bisa kembali ke bentuk semula, ini karena adanya ikatan silang antar molekul penyusunnya)
- Polimer Termoplastik (bahan yang dipanaskan meleleh dan mengeras jika didinginkan tapi bisa kembali lagi ke bentuk semula, ini karena adanya ikatan lurus atau bercabang dengan gaya antar molekul yg lemah)
"Incidentally, I was placed in
LLDPE plant section. Here I was learned about the production process and
process control. Every day with line engineer, I was explained to the plant how
working of instruments and instruments function. During first month I got a lot
of knowledge, because I can compare between knowledge in college with reality
on the line industries. I was given assignment to analyze performance of
compressor and cooler. From my analyze and calculation, I could conclusion that
both instruments has been reduced performance and I took conclusion that one of
them for compressor seal valve is broken and for cooler there is sediment in
the shell and tube. LLDPE is one of several product of this plant, which it is
thermoplastic polymer and many used in downstream industries such as bottle,
plastic bag, textile, fertilizer etc.
Polymer is divided into 2 part that
based on thermal properties such as :
- Thermosetting polymer (material is heated so that melt and harden if cooled but can't return to the original shape, because there is crosslinking between constituent molecules)
- Thermoplastic polymer ( material is heated so that melt and harden if cooled but can return to the original shape, because there is linear bond or branch with weak force between intermolecules)."
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