Conceptual design for a process to recover volatile solutes from aqueous solutions using silicalite

Holtzapple, Mark T.; Brown, Russell F.

doi:10.1016/0956-9618(94)80025-1

Cited by 24 publications

(12 citation statements)

References 2 publications

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“…EtOH) was required while a 1 wt% ethanol feed demanded 13.4 MJ-fuel/kg-EtOH (9.2 MJ-heat/L-95% EtOH) 84 . Note that the latter energy demand is less than predicted for distillation ( Fig.…”

Section: Adsorptionmentioning

confidence: 99%

Separation technologies for the recovery and dehydration of alcohols from fermentation broths

Vane

2008

Biofuels Bioprod Bioref

503

352

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Multi-column distillation followed by molecular sieve adsorption is currently the standard method for producing fuel-grade ethanol from dilute fermentation broths in modern corn-to-ethanol facilities. As the liquid biofuels industry transitions to lignocellulosic feedstocks, expands the end-product portfolio to include other alcohols, and encounters more dilute alcohol concentrations, alternative separation technologies which are more energy effi cient than the conventional approach will be in demand. In this review, alcohol recovery technology options and alcohol dehydration technology options for the production of ethanol and 1-butanol are reviewed and compared, with an emphasis on the energy footprint of each approach. Select hybrid technologies are also described.

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“…EtOH) was required while a 1 wt% ethanol feed demanded 13.4 MJ-fuel/kg-EtOH (9.2 MJ-heat/L-95% EtOH) 84 . Note that the latter energy demand is less than predicted for distillation ( Fig.…”

Section: Adsorptionmentioning

confidence: 99%

Separation technologies for the recovery and dehydration of alcohols from fermentation broths

Vane

2008

Biofuels Bioprod Bioref

503

352

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“…3). These calculations assume that the silicalite column adsorbs 50% water which can be desorbed at 40°C [11,21] to achieve a butanol concentration of 810 g L À1 . Butanol recovery by steam stripping and distillation requires 5,789 kcal kg À1 butanol followed by gas stripping (5,220 kcal kg À1 butanol), pervaporation (3,295 kcal kg À1 butanol), and liquid-liquid extraction (2,119 kcal kg À1 butanol) [9].…”

Section: Energy Requirementmentioning

confidence: 99%

Energy-efficient recovery of butanol from model solutions and fermentation broth by adsorption

Qureshi

Hughes

Maddox

et al. 2005

Bioprocess Biosyst Eng

336

251

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This article discusses the separation of butanol from aqueous solutions and/or fermentation broth by adsorption. Butanol fermentation is also known as acetone butanol ethanol (ABE) or solvent fermentation. Adsorbents such as silicalite, resins (XAD-2, XAD-4, XAD-7, XAD-8, XAD-16), bone charcoal, activated charcoal, bonopore, and polyvinylpyridine have been studied. Use of silicalite appears to be the more attractive as it can be used to concentrate butanol from dilute solutions (5 to 790-810 g L(-1)) and results in complete desorption of butanol (or ABE). In addition, silicalite can be regenerated by heat treatment. The energy requirement for butanol recovery by adsorption-desorption processes has been calculated to be 1,948 kcal kg(-1) butanol as compared to 5,789 kcal kg(-1) butanol by steam stripping distillation. Other techniques such as gas stripping and pervaporation require 5,220 and 3,295 kcal kg(-1) butanol, respectively.

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“…Consequently, use of dilute sugar solution results in large process streams that impacts the process economics adversely. One of the possible solutions to address this problem is to recover butanol/ABE simultaneously so that it does not reach culture's toxicity level in the fermentation broth . One of the advantages of in situ or simultaneous product removal is to be able to ferment concentrated sugar solutions .…”

Section: Introductionmentioning

confidence: 99%

“…One of the possible solutions to address this problem is to recover butanol/ABE simultaneously so that it does not reach culture's toxicity level in the fermentation broth. [5][6][7][8][9][10] One of the advantages of in situ or simultaneous product removal is to be able to ferment concentrated sugar solutions. 11,12 Hence, to improve economics of the process, solid loadings should be increased to much higher level so that same amount of product can be produced in smaller size reactor.…”

Section: Introductionmentioning

confidence: 99%

High solid fed‐batch butanol fermentation with simultaneous product recovery: Part II—process integration

Qureshi

Saha

Klasson

et al. 2018

Biotechnology Progress

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In these studies, liquid hot water (LHW) pretreated and enzymatically hydrolyzed Sweet Sorghum Bagasse (SSB) hydrolyzates were fermented in a fed-batch reactor. As reported in the preceding paper, the culture was not able to ferment the hydrolyzate I in a batch process due to presence of high level of toxic chemicals, in particular acetic acid released from SSB during the hydrolytic process. To be able to ferment the hydrolyzate I obtained from 250 g L SSB hydrolysis, a fed-batch reactor with in situ butanol recovery was devised. The process was started with the hydrolyzate II and when good cell growth and vigorous fermentation were observed, the hydrolyzate I was slowly fed to the reactor. In this manner the culture was able to ferment all the sugars present in both the hydrolyzates to acetone butanol ethanol (ABE). In a control batch reactor in which ABE was produced from glucose, ABE productivity and yield of 0.42 g L h and 0.36 were obtained, respectively. In the fed-batch reactor fed with SSB hydrolyzates, these productivity and yield values were 0.44 g L h and 0.45, respectively. ABE yield in the integrated system was high due to utilization of acetic acid to convert to ABE. In summary we were able to utilize both the hydrolyzates obtained from LHW pretreated and enzymatically hydrolyzed SSB (250 g L ) and convert them to ABE. Complete fermentation was possible due to simultaneous recovery of ABE by vacuum. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 34:967-972, 2018.

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Conceptual design for a process to recover volatile solutes from aqueous solutions using silicalite

Cited by 24 publications

References 2 publications

Separation technologies for the recovery and dehydration of alcohols from fermentation broths

Separation technologies for the recovery and dehydration of alcohols from fermentation broths

Energy-efficient recovery of butanol from model solutions and fermentation broth by adsorption

High solid fed‐batch butanol fermentation with simultaneous product recovery: Part II—process integration

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