Algal Biomass Conversion

39 Pages·2015·2.18 MB·English

BETO 2015 Project Peer Review
Algal Biomass Conversion
WBS 1.3.4.201
Philip T. Pienkos
National Renewable Energy Laboratory

March 24th, 2015
This presentation does not contain any proprietary, confidential, or otherwise restricted information
NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.
Goal Statement
Reduce algal biofuel
production cost by
developing advanced
process options for the
conversion of algal
biomass into biofuels
and bioproducts based
on the three major
biomass components:
lipids, carbohydrates,
and proteins.
2
Quad Chart Overview
Timeline Barriers
• Project start date: 1/30/13 Barriers addressed
• Project end date: 9/30/17 – AFt-H. Overall Integration and Scale-
Up
• Percent complete: 46%
– AFt-I. Algal Feedstock Preprocessing
• Existing Project
– Aft-J. Resource Recapture and
Recycle
Budget Partners
• Partners
Total Costs FY 13 FY 14 Total Planned
FY10 –FY12 Costs Costs Funding (FY 15-
• ASU for biomass supply
Project End Date
• SNL for fermentation of protein
• Other interactions/collaborations
DOE $0 $17,597 $626,735 $2,454,891
• NREL Algal Biomass Valorization and
Funded
Techno-Economic Analysis projects
• ANL for LCA modeling
• Algix for evaluation of protein
• Non-technical project
management partners
• None

3
1 - Project Overview
• Work began in FY13 to reduce biofuel
production cost through biomass
fractionation and component
valorization.
• Process evaluated for biomass
produced in outdoor cultivation
systems at ASU
• Scenedesmus acutus (LRB-AP 0401)
• Chlorella vulgaris (LRB-AZ 1201)
• Nannochloropsis granulata (CMP535 aka
LRB-MP-0209 )
• Additional cost savings can be
achieved by replacing parallel
processing with sequential processing.
• Biomass conversion process has
become the framework for the Algal
Lipid Upgrading (ALU) Design Case
and State of Technology.

4
2 – Approach (Technical)
• Project plan has four components
Development of pretreatment process for hydrolysis of algal
•
carbohydrates and release of monomeric sugars
Development of extraction process for efficient recovery of fuel-grade
•
lipids
Demonstration of fermentation processes for valorization of algal
•
sugars
Development of lipid upgrading process for evaluation of feedstock
•
quality and feedback with upstream processes
• Scale processes from 10 gram to 100 kg.
• Interact with TEA project for guidance on technical plan and
to provide data for modeling
• Interact with Algal Biomass Valorization project for
identification of novel coproduct strategies
5
2 – Approach (Management)
• Critical Success Factors
o Extraction lipid yield
o Extraction CAPEX
o Hydrotreating CAPEX
o Solids content in slurry
o Pretreatment glucose yields
• Top potential challenges
o Low cost scalable extraction process
o High sugar yields with minimal degradation products
o Lipid upgrading to achieve product specifications (diesel vs diesel
blendstock)
• Management Structure
o Pretreatment and extraction (Nick Nagle)
o Lipid upgrading (Bob McCormick)
o Weekly progress update meetings
o Quarterly milestones to track progress

6
3 – Technical Accomplishments/ Progress/Results:
Potential Fuel Yields From Algal Biomass
7
Potential Cost Savings from Fractionation
Process
8
Algal Lipids and Carbohydrates
NC: Laminarin
Element HL CZ HC CZ HL SD HC SD HL NC CZ: Starch
SD: Glucomannan
Carbon 76.83 77.42 77.53 76.61 76.87

Hydrogen 11.74 11.54 12.00 11.91 11.77

Nitrogen 0.04 0.05 0.03 0.10 0.09
Oxygen 11.86 11.37 11.04 11.93 11.96
Sulfur 0.004 0.006 0.005 0.026 0.036
Phosphorus <0.001 <0.001 <0.001 0.001 0.039
9
Hydrodeoxygenation
• Algal oil diluted to 25% in hexane
• Liquid product is primarily n-paraffin
• Oxygen removal is primarily through decarbon/xylation
10