CARRAGEENAN EXTRACTED FROM Eucheuma cottonii SEAWEED FOR ENHANCED OIL RECOVERY (EOR) APPLICATION

• Main Author: Ganesh Darmayanti, Made
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34408
• Institution: Institut Teknologi Bandung

Enhanced Oil Recovery (EOR) is a tertiary technique for increasing the amount of crude oil that can be extracted from an oil field. One of the techniques in EOR is polymer flooding, in which a certain polymer is injected and the polymer should have some characteristics, such as high viscosity even in low concentrations, resistant to high temperature, shear rate, and salinity. In this work, carrageenan has been successfully extracted from Eucheuma cottonii seaweed. A modification of carrageenan with acrylamide has also been done using microwave-assisted grafting copolymerization method The carrageenan was extracted by three different extracting solvents, namely water, KOH 0,3 N, and a mixture of water, NaOH 0,1 N, and NaCl 10%. Based on the analysis of functional groups in the FTIR spectrum, all of the three solvents produced kappa-type carrageenan, where water was investigated to be the solvent that extracted the optimum carrageenan with the amount of rendement, intrinsic viscosity, and average molecular weight of 18.64%, 12.77 dL/g, and 4.72 x 10 5 g/mol, respectively. The carrageenan-gra:ft-acrylamide (KC-g-AAm) copolymer was synthesized by dissolving the optimum carrageenan in water, using potassium persulfate (KPS) as the initiator, and varying the microwave power in some variations of time exposure. The copolymerization product with the optimum grafting percentage (%G) and intrinsic viscosity was obtained by the synthesis reaction using 70% of microwave power under 20 s of time exposure. Some characterizations has been done towards the carrageenan and the produced copolymer, such as dynamic viscosity measurement, rheological measurement, and thermal degradation test. The rheological measurement indicated that the carrageenan and the produced copolymer showed relatively high resistance to temperature, shear rate, and salinity rather than commercial polymers of HyboMax®, PI, and PIT, eventhough to reach the same viscosity as the commercial polymers, high concentration of carrageenan and the copolymer is still needed