Terephthalic Acid dari Dimetil 1,4-benzenedicarboxylate Menggunakan Proses Hidrolisis

Renaldi, Miftachul Ichwan (2025) Terephthalic Acid dari Dimetil 1,4-benzenedicarboxylate Menggunakan Proses Hidrolisis. Undergraduate thesis, UPN Veteran Jawa Timur.

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Abstract

Terephthalic Acid is a compound with a wide range of applications in the chemical industry. It is used as an intermediate in the production of PET resin and plasticizers, making the demand for Terephthalic Acid increasingly high and important in the industrial world. The potential for establishing a Terephthalic Acid plant in Indonesia is quite promising; therefore, the design of a chemical plant producing Terephthalic Acid needs to be planned. This plant is planned to be established in 2028 with a production capacity of 100,000 tons per year at the Java Integrated Industrial and Port Estate (JIIPE) located in Sukomulyo Village, Manyar District, Gresik Regency. The plant will operate for 330 days per year and employ 197 workers. The production process of Terephthalic Acid (TPA) from Dimethyl Terephthalate (DMT) begins with the reception of DMT in flake form from the supplier, which is stored in a warehouse as a stockpile using a conveyor and crane system. DMT is then transported to a silo via a belt conveyor and bucket elevator, after which it is fed into a solvent tank to be dissolved in process water supplied from the utility system. The resulting DMT solution is then pumped, compressed to a pressure of 40 atm, and heated to 240°C before entering the hydrolysis stage. The hydrolysis process is carried out in two stages to maximize conversion. In Hydrolyzer-1, DMT undergoes hydrolysis with water under operating conditions of 40 atm and 240°C, producing terephthalic acid with 100% conversion. The overhead product, consisting of methanol vapor and water, is condensed in a condenser, while the bottom product containing terephthalic acid and unreacted DMT is fed to Hydrolyzer-2 after being recompressed to 20 atm and cooled to 220°C. In Hydrolyzer-2, the remaining DMT undergoes hydrolysis again under conditions of 20 atm and 220°C, achieving 98% conversion, producing an overhead stream of methanol and water (also condensed), and a bottom product containing a mixture of terephthalic acid and impurities. The product from Hydrolyzer-2 then proceeds to the purification and crystallization stages. The TPA solution is first evaporated in an evaporator to reduce its high water content before entering the crystallizer. Crystallization takes place at atmospheric pressure and 30°C with agitation to produce crystals sized between 100–130 μm. The formed crystals are then separated from the mother liquor using a centrifuge, yielding a wet cake that is subsequently dried in a rotary dryer using hot air in a counter-current flow with the assistance of a blower and air heater. The fine particles carried by the air are separated in a cyclone, where the hot air is discharged into the atmosphere while the solid particles are returned to the cooling conveyor. The dry TPA product from the cooling conveyor is then transported via a bucket elevator to a temporary silo, and subsequently fed through a screw conveyor to a rotary packer for packaging in 25 kg bags. The final TPA product is then delivered to the Terephthalic Acid warehouse via a belt conveyor for storage before distribution. As a by-product, the mixture of methanol and water vapor from both hydrolyzers is condensed at room temperature in a condenser, collected in a storage tank, and directly sold as a crude methanol mixture on the market. Therefore, this process not only produces TPA as the main product but also utilizes methanol as a valuable by-product, enhancing the overall economic value of the plant.

Item Type: Thesis (Undergraduate)
Contributors:
ContributionContributorsNIDN/NIDKEmail
Thesis advisorMuljani, Srie0012116111sriemuljani.tk@upnjatim.ac.id
Subjects: T Technology > T Technology (General)
T Technology > TP Chemical technology > TP155 Chemical engineering
Divisions: Faculty of Engineering > Departement of Chemical Engineering
Depositing User: Miftachul Ichwan Renaldi
Date Deposited: 03 Nov 2025 06:47
Last Modified: 03 Nov 2025 06:47
URI: https://repository.upnjatim.ac.id/id/eprint/46008

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