Banca de DEFESA: TASSIO LESSA DO NASCIMENTO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : TASSIO LESSA DO NASCIMENTO
DATE: 13/03/2023
TIME: 08:00
LOCAL: Google Meet (link: https://meet.google.com/kzo-orwy-cgyv)
TITLE:

Development of Bifunctional Additives Derived from Cashew Nut Liquids for Application in Diesel/Biodiesel Blends.

KEY WORDS:

Cardanol; LCC; LCC derivatives; fuel additives; antioxidant property;  lubricity.

PAGES: 132
BIG AREA: Ciências Biológicas
AREA: Bioquímica
SUMMARY:

World concerns regarding environmental pollution and global warming have  strengthened the search for alternative solutions to the consumption of oil and its  derivatives. For this reason, biodiesel was introduced in the Brazilian energy matrix  through the National Program for Biodiesel Production and Use (PNPB), whose objective  is to implement its production and use it in a sustainable way, with a focus on social  inclusion and regional development, also aiming to reduce the dependence on imports of  fossil oil derivative, diesel oil. Biodiesel is used in the vehicular fleet through its insertion  together with diesel, which has high oxidative stability when compared to biodiesel.  However, in the diesel/biodiesel blend, the oxidation instability of biodiesel  predominates, causing long term wear and/or corrosion in the mechanical devices of  vehicles fueled with this combination. In this scenario, antioxidant agents stand out, from  which cardanol, a by-product of the cashew nut processing industry and is present in the  Cashew Nut Liquid (CNSL), is included. In this present project, the main objective was  to evaluate the potential of cardanol and some of its derivatives as fuel additives, with  antioxidant and lubricity properties. In that, eight LCC derivative additives (AD-LCC)  were synthesized, such as: 3-pentadecylphenol (compound 1), 2-tert-butyl-5- pentadecylphenol (compound 3), 2-nitro-5-pentadecylphenol (compound 4), diethyl-3- pentadecylphenyl phosphate (compound 5), 3-pentadecylphenyl diphenyl (compound 6),  tri (3-pentadecylphenyl) phosphate (compound 7), 2-tert-butyl-5-pentadecylphenyl  diethyl phosphate (compound 8) and 2- tert-butyl-5-pentadecylphenyl diphenyl  phosphate (compound 9). The AD-LCC/derivative compounds were characterized by Gas  Cromatography Coupled to Mass Spectrometer (GC/MS) and by Infrared (IR) and  Nuclear Magnetic Resonance (H1and C13 NMR) spectroscopies. The antioxidant activity  of AD-LCC/derivative products, at concentration 2000 mg/kg was evaluated by DPPH•  and Rancimat methods, in soy biodiesel synthesized in the laboratory and characterized  according to ANP Resolution No. 45 of 08/25/2014. All AD-LCC/derivative compounds  stabilized the DPPH• radical, from which compounds 1, 3, and 7 showed the highest  percentages of free radical reduction (46.5, 81.1, and 43%, respectively). In the test via  Rancimat, all AD-LCC/derivative compounds increased the induction time of soy  biodiesel, where the largest increases correspond to compounds 3 (31%), 7 (32.8%) and  9 (31%). The lubricity of the additives AD-LCC was evaluated by the Four Ball  technique, in the diesel/biodiesel mixture on the ratio 8:2, with satisfactory results,  exception for compound 4, who showed no influence on the lubricity regime in the  analyzed mixture. Comparatively, the AD-LCC/phosphorus derivatives were the most  efficient and represent a class of eco-friendly synthetic compounds, so if commercialized,  they will add biotechnological value to the fuel industries. 

COMMITTEE MEMBERS:
Externa à Instituição - ADA AMÉLIA SANDERS LOPES - UNILAB
Externo ao Programa - 1346198 - EVERALDO SILVINO DOS SANTOS - UFRNExterno à Instituição - FRANCISCO EDUARDO ARRUDA RODRIGUES - IFCE
Externo à Instituição - HÉLCIO SILVA DOS SANTOS - UVA
Presidente - ***.201.654-** - MARIA APARECIDA MEDEIROS MACIEL - UnP