Catalytic hydroprocessing of ground cottonseeds in a cottonseed oil and 1-octane solvent to produce renewable diesel. (Slide presentation)
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(2) 3DO.6.1. Background and motivation. • Hydrotreatment of HTL bio-oil (two-step process). 3DO.6.1. Background and motivation •. Aim – Determine if renewable diesel can be directly produced from dry biomass – Maximize renewable diesel yield. •. Objectives – Biomass loading – Effect of solvent – Effect of temperature.
(3) 3DO.6.1. Experimental setup. 3DO.6.1. Experimental setup. Vessel Volume = 350 cm3. GC analysis. Reactor temperature Heating jacket temperature.
(4) 3DO.6.1. Catalyst activation. • • • •. 6 g NiMo catalyst N2 purge H2S pressure: 5 MPa Temperature: 400°C (6°C/min) • Residence time: 1 hr. 3DO.6.1. Reaction. • • • • • • • •. Depressurisation Cooled down Solvent added (syringe) Dry biomass added (5 wt%, 10 wt%, 15 wt%) N2 purge H2 pressure: 9 MPa Temperature: 350-410°C (6°C/min) Residence time: 1 hr.
(5) Pure cottonseed oil (9 MPa, 410°C). • • •. Saturation of double bonds Cracking of triglycerides Decarboxylation and decarbonylation. Cottonseed oil as solvent (9 MPa, 410°C). • •. Less saturation of double bonds Decarboxylation and decarbonylation.
(6) Iso-octane as solvent (9 MPa, 410°C). • •. No unsaturated fatty acids present Hydrodeoxygenation. 3DO.6.1. Reaction pathway •. Reaction pathways – Decarboxylation – Decarbonylation – Hydrodeoxygenation. 𝐶𝑛 𝐻2𝑛+1 → 𝑛𝐶𝑛 𝐻2𝑛+2 + 𝐶𝑂2. 𝐶𝑛 𝐻2𝑛+1 + 𝐻2 → 𝑛𝐶𝑛 𝐻2𝑛+2 + 𝐶𝑂 + 𝐻2 𝑂. 𝐶𝑛 𝐻2𝑛+1 + 3𝐻2 → 𝑛𝐶𝑛+1 𝐻2𝑛+4 + 2𝐻2 𝑂. 5. 6 7.
(7) 3DO.6.1. Reaction pathway Temperature (°C). Solvent. C18:C17. C16:C15. 350. Cottonseed oil. 0.86. 0.98. 390. 0.70. 1.04. 410. 0.49. 0.56. 1.73. 1.86. 370. 1.71. 1.79. 390. 1.75. 1.83. 410. 1.79. 1.95. 350. Iso-octane. 3DO.6.1. Reaction pathway.
(8) 3DO.6.1. Liquid and char yields Cotton seed oil solvent. i-octane solvent. Temperature (°C). Liquid yield. Solid yield. Liquid yield. Solid yield. 350. 72%. 9%. 34%. 19%. 370. 70%. 7%. 29%. 20%. 390. 82%. 2%. 47%. 7%. 410. 76%. 1%. 29%. 11%. 3DO.6.1. Liquid yield.
(9) 3DO.6.1. Biomass loading: Cottonseed oil. Diesel product yield %. 80%. 75%. 70%. 65%. 60%. 55% 0%. 5% 10% Biomass loading (wt%). 15%. 3DO.6.1. Liquid composition (9 MPa, 410°C).
(10) 3DO.6.1. Results and discussion. 3DO.6.1. Results and discussion: iso-octane.
(11) 3DO.6.1. Conclusion • • •. Liquid phase is indeed renewable diesel Possible to produce renewable diesel from dry biomass Maximum liquid yield at 390°C, 10 wt%. Thank you Tack så mycket.
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