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Lignin Extraction and Recovery Process (LERP)
Transcript of Lignin Extraction and Recovery Process (LERP)
1,000 tpd Kraft pulp mill
10:1 ratio of black liquor to pulp
Hardwood Eucalyptus feed
10% of black liquor treated in process
Negligible thermodynamic losses and constant temperature
Process off-gases sent to existing NCG system
Black liquor is a byproduct comprised of spent pulping chemicals, lignin, and hemicellulose
Burned inside the recovery boiler to generate power and recover the spent pulping chemicals
Size of boiler limits maximum pulp production
Up to 25% of lignin can be extracted from the liquor via LERP
Decreases heating value of the liquor
Allows for increase in recovery boiler liquor throughput
LERP Process Overview
The Kraft Process
Lignin Extraction + Recovery Process
Highly alkaline solution dissolves woodchips into solution
Cellulose is recovered, and sent for further processing
Black liquor is spent cooking chemicals, lignin, and hemicellulose
Black Liquor is burned in a recovery boiler to recover cooking chemicals
Recovery boiler produces steam to generate power for the mill
Recovery boiler steaming limit restricts production for entire mill
Scaling Recovery Boiler
Lowers heating value of black liquor
Generates lignin by-product
$100 million approximate capital cost
Extensive environmental re-evaluation
Project Manager + EHS
Filter Presses + Economics
Process Design + Drawings
Pumps + Material Balance
Reactors + Process Specs
Lignin Precipitation Reactor
100-second residence time promotes continuous flow
4-inch Schedule-40 stainless steel piping prevents corrosion from alkaline black liquor and allows high pressure
Pressure controlled to 80 psia
pH controlled to 9.3 with carbon dioxide to maintain 75% conversion
Chamber Filter Presses
20,000-gallon, glass-lined mixing tank prevents corrosion from acidic conditions
pH controlled between 2.0-3.5 with sulfuric acid
Marketability of Kraft Lignin
Kraft lignin is 80-95% pure lignin
Natural and sustainable products
Increasing Market Demand
Current Global Kraft Lignin Production:
High grade chemical products
Research and Development
Alternative fuel for industrial use
Co-firing lignin with coal
Reduces coal emissions
Fuel pellet additive
Increases structural integrity
Compared to similar biofuels
HV – 11,000Btu/lb
Up to $6500/ton
LERP Minimum Sale Price
Kraft mills that can sell their product for at least $200 per ton should install LERP as an effective method to increase pulp mill capacity.
TCP Consulting Co.
Total Chemical Products is committed to providing the paper and pulp industry with advanced engineering technology to maximize profitability. We have 5 years of combined experience in research, process and environmental engineering specific to paper and pulp, agriculture, and material science industries. We are committed to providing a quality service with a focus on safety, environmental stewardship, and customer satisfaction.
(2010). Future of lignin in value added products. LigniMatch. Retrieved from https://www.chalmers.se/gmv/EN/projects/previous-projects/lignimatch.
(2016). Large capacity J-press sidebar filter presses. Evoqua Water Technologies. Retrived from http://www.evoqua.com/en/brands/JWI/Pages/Large-Capacity-JPress-Sidebar-Filter-Presses.aspx.
Gellerstedt, G., Sjöholm, E., & Brodin, I. (2010). The Wood-Based Biorefinery: A Source of Carbon Fiber? The Open Agriculture Journal TOASJ, 4, 119-124.
Miettinen, M. (2014). US Patent No. US20130203972A1. UPM-Kymmene Oy.
Novaes, Evandro, Kirst, Matias, Chiang, Vincent, Winter-Sederoff, Heike, Sederoff, Ronald. (2010). Lignin and Biomass: A Negative Correlation for Wood Formation and Lignin Content in Trees.
Fossil Fuel Offset
Sold as Biofuel
Filter Press 1 [A=900m^2, V=20m^3]
50 Minute Fill Time
45 Minute Discharge
Filter Press 2 and 3 [A=750m^2, V=8m^3]
30 Minute Fill Time
45 Minute Discharge
Polypropylene Felt Filters