LIFIANA, NENO NIDIA (2022) PRA RENCANA PABRIK HEXAMINE DARI AMMONIA DAN FORMALINE DENGAN PROSES MEISSNER. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
The Hexamine plant with a capacity of 50,000 tons/year will be established in JIIPE Gresik Industrial Estate, East Java. Factory operates 24 hours in a day and for 330 days in a year. This Hexamine factory is made from Ammonia and Formaldehyde raw materials. Hexamine is one product that very often used, especially in the resin sector. In the resin industry, hexamine commonly used as a liquid resin stabilizer, while Hexamine is also widely used used in various other fields: medicine (antiseptic raw material), rubber industry (accelerator that can make rubber elastic), industry pharmaceutical (as a disinfectant), steel industry (as an inhibitor). Hexamine in this factory design is made through the Meissner process where the 37% formaldehyde solution from the tank is flowed into the reactor, then Ammonia gas from the tank is flowed to the bottom of the reactor (R-210) through the sparger. The ratio of ammonia and formaldehyde in this process is 4: 6 (Keys, 1957). In the reactor (R-210) a reaction occurs between formaldehyde and ammonia to form hexamine. The reaction takes place at a pressure of 1 atm and a temperature of 80°C operation with a residence time of 30 minutes. The reaction has a conversion of 97% and the product leaving the reactor in the form of a dilute hexamine solution has a concentration of 25%. The hexamine solution was then concentrated in a vacuum evaporator (V-310) at pressure (0.69 atm) with an operating temperature of 90°C to have a concentration of 55%. Hexamine solution was put into the crystallizer (S-320). Crystallization running by cooling so that supersaturation (saturation) of hexamine and crystallize at 30°C. Crystals and mother liquor come out crystallizer then flowed to a centrifuge (H-330) for the crystal separation process and filtrate. The filtrate in the form of mother liquor is then recycled back to the crystallizer (S-320), while the wet crystals are then transferred to a rotary dryer (B-340). with screw conveyor (J-333). In the rotary dryer (B-340), the crystals are dried with hot air in a counter-current (opposite direction) with a temperature of 110°C. The air comes from the free air that is blown by the blower and heated on burners. The hot air and the following solids are then separated in a cyclone (H-343), where the separated solids are passed along with the bottom product rotary dryer (B-340) goes to the cooling conveyor (E-344) to be cooled up to room temperature (30°C). Cold crystals are then flowed with bucket elevator (J-345) to Ball Mill (C-350) for uniform size 200μm before being transported to the hexamine silo (F-370) as the final product.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > T Technology (General) | ||||||||
| Divisions: | Faculty of Engineering > Departement of Chemical Engineering | ||||||||
| Depositing User: | NENO NIDIA LIFIANA | ||||||||
| Date Deposited: | 28 Jul 2022 08:16 | ||||||||
| Last Modified: | 28 Jul 2022 08:16 | ||||||||
| URI: | http://repository.upnjatim.ac.id/id/eprint/8326 |
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