Cabot Corporation · NYSE:CBT
Cabot — Technical Presentation (January 2017)
23 slides from Cabot's technical presentation, Jan 10, 2017
Slide 1: Evaluation of Activated Carbons for Sequestration of PCBs and PAHs for Sediment Remediation
Evaluation of Activated Carbons for Sequestration of PCBs and PAHs for Sediment Remediation Dr. Mei Xin, Dr. Susnata Samanta, David Flannery (Cabot Corporation, Boston, MA) Dr. Danny Reible (Texas Tech. University, Lubbock, TX) January 10, 2017
Slide 2: About Cabot Corporation
About Cabot Corporation A rich and unique history ▪ Over 130 years in operation ▪ Founded 1882 ▪ NYSE: CBT since 1968 ▪ Global specialty chemicals and performance materials company ▪ 45 manufacturing sites in 21 countries ▪ Core technical competencies in fine particles and surface modification ▪ FY2
Slide 3: Cabot Norit Activated Carbon
Cabot Norit Activated Carbon ▪ World’s largest producer of activated carbon ▪ Manufacturing since 1916 ▪ 9 plants ▪ Sold globally ▪ Cabot makes activated carbon from many raw materials, including: ▪ Lignite coal ▪ Bituminous coal ▪ Coconut shell ▪ Wood ▪ Peat ▪ Products used widely in potable water
Slide 4: What is activated carbon?
What is activated carbon? Characteristics • Large internal surface area • 1 teaspoon (5 g) has the same surface area as a football field (1,000m2/g) • Large internal pore volume (cc's/g) • Large adsorption capacity 4
Slide 5: Activated carbon forms
Activated carbon forms POWDER GRANULAR EXTRUDATE 5
Slide 6: Activated Carbon for Sediment Remediation
Activated Carbon for Sediment Remediation 6
Slide 7: Objective
Objective To provide information to help in design of caps Freundlich sorption isotherms (Kf, 1/n) and adsorption kinetics for PCBs and PAHs required for sediment remediation design with activated carbons Information for engineering firms to aid in design of sediment remediation caps using CAPSI
Slide 8: Experimental Design
Experimental Design Topic Description Sample prep • All experiments conducted in separate batches for 1L (PAH) and 250 ml (PCB) water solutions in amber bottles Water matrix • 1L deionized water (DI) plus 350 mg of instant ocean salt and 100 mg of sodium azide • NOM loaded water: Suwannee River NOM
Slide 9: Bench Scale Adsorption Results
Bench Scale Adsorption Results 9
Slide 10: Kinetics Study – PAC vs. GAC
Kinetics Study – PAC vs. GAC At equilibrium state, PAC and GAC adsorb same amount of PAHs PAC and GAC both show fast adsorption for low molecular weight PAHs (naphthalene MW 128) PAC shows much faster adsorption than GAC for high molecular weight PAHs (pyrene MW 202 ) 10
Slide 11: Freundlich Adsorption Isotherms
Freundlich Adsorption Isotherms Lignite carbon is resilient to NOM impact · Lignite carbon was exposed to NOM 25ppm for 30 days prior to the adsorption measurement 17 OCTOBER 2017 / CABOT OVERVIEW 11 11
Slide 12: AC Capacity NOM / AC Capacity DI
Compared to lignite carbon, coconut shell carbon is more sensitive to NOM impact PHENANTHRENE PCB 118 Coconut AC Lignite AC Coconut AC Lignite AC 150 /AC Capacity DI, % AC Capacity NOM AC Capacity NOM /AC Capacity DI, % 125 100 100 75 75 50 50 25 25 0 0 0 50 100 150 0 5 10 15 Phenanthrene Conc. (ug/
Slide 13: CAPSIM Model Simulations
CAPSIM Model Simulations 13
Slide 14: CAPSIM Cap Design Model Parameters
CAPSIM Cap Design Model Parameters Parameter range analyzed in this project Parameter Description Low Medium High Reactive cap Sand + activated carbon Used for all scenarios (15 cm cap + 30 cm sediment) % Activated Carbon Mass % of activated carbon in cap 1% 5% 10% Upwelling rate Fresh water up-flow
Slide 15: CAPSIM Modeling – Naphthalene
CAPSIM Modeling – Naphthalene PAHs and PCBs quickly breakthrough a 100% sand cap Sand (15 cm) Upwelling UpwellingRate Rate Sediment (30 cm) Sand cap without activated carbon at low and high upwelling rates 15
Slide 16: CAPSIM Modeling – Naphthalene
CAPSIM Modeling – Naphthalene Lignite and coconut PAC performance is similar (10% PAC, 1 cm/day upwelling, 25 ppm NOM) LIGNITE PAC COCONUT PAC No PAH breakthrough after 100 years with either activated carbon 16
Slide 17: CAPSIM Modeling – PCB
CAPSIM Modeling – PCB 101 Lignite and coconut PAC performance is similar (5% PAC, 1cm/day upwelling, 25 ppm NOM) LIGNITE PAC COCONUT PAC No PCB breakthrough after 100 years with either activated carbon 17
Slide 18: CAPSIM Modeling – PCB
CAPSIM Modeling – PCB 77 PAC is better than GAC at high upwelling rate (20%AC, 3cm/day upwelling, 25ppm NOM) PAC GAC Carbons made from different feedstocks perform the same under both conditions 18
Slide 19: CAPSIM Modeling - Pyrene
CAPSIM Modeling - Pyrene Need more bituminous AC to achieve the same performance as lignite AC for high MW PAHs LIGNITE PAC BITUMINOUS PAC Conditions: 1% AC, 1 cm/day upwelling rate, no NOM When carbon dose is 5%, there is no significant difference between lignite and bituminous carbons 19
Slide 20: Conclusions
Conclusions Investigation Conclusions Capacity vs. • Adsorption capacity is the same for PAC and GAC although GAC may absorb less due to Kinetics slower kinetics of sorption • HOCs have low solubility and migrate slowly, so kinetics is not important if low upwelling PAC vs. GAC • Adsorption rate of
Slide 21: For further information, please contact:
For further information, please contact: Billy Barron Regional Marketing Manager Cabot Norit Activated Carbon T +1 678 297 1549 M +1 470 281 8465 Billy.Barron@cabotcorp.com One Point Royal 4400 North Point Parkway Suite 200 Alpharetta, Georgia 30022 www.cabotcorp.com Battelle Conference Booth #431 1
Slide 22: Acknowledgements
Acknowledgements Prof. Danny Reible, PhD PE BCEE NAE Donovan Maddox Distinguished Engineering Chair Texas Tech University Tariq Hussain Ph.D. Candidate Texas Tech University Dr. Magdalena Rakowska Postdoc Researcher Texas Tech University Xiaolong Shen Ph.D. Candidate Department of Chemical Engineeri
Slide 23: Questions?
Questions? CABOT