liquid hot water pretreatment
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Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1518
Author(s):  
Jose M. (Chema) Jimenez-Gutierrez ◽  
Rob A. J. Verlinden ◽  
Peter C. van der Meer ◽  
Luuk A. M. van der Wielen ◽  
Adrie J. J. Straathof

Liquid hot water pretreatment is considered to be a promising method for increasing biomass digestibility due to the moderate operational conditions without chemical additions. A necessary step towards the scalability of this pretreatment process is performing pilot plant trials. Upscaling was evaluated with a scaling factor of 500, by using 50 mL in the laboratory and 25 L in a pilot plant batch reactor. Pretreatment times were varied from 30 to 240 min, and temperatures used were 180–188 °C, while applying similar heating profiles at both scales. The initial mass fraction of poplar wood chips ranged from 10% to 16%. Liquid hot water pretreatment at laboratory and pilot scale led to analogous results. The acetic acid analysis of the liquid and solid fractions obtained after pretreatment indicated that complete deacetylation of poplar biomass can be achieved.


2021 ◽  
Author(s):  
Juan Camilo Acosta Pavas ◽  
Nataly Bonilla OSpina ◽  
Ligia Johana Jaimes Cruz ◽  
Héctor Jairo Correa Cardona ◽  
Ángel María Giraldo Mejía ◽  
...  

ACS Omega ◽  
2020 ◽  
Vol 5 (46) ◽  
pp. 29872-29881
Author(s):  
Nopparat Suriyachai ◽  
Khatiya Weerasai ◽  
Supawan Upajak ◽  
Punjarat Khongchamnan ◽  
Wanwitoo Wanmolee ◽  
...  

Foods ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1640
Author(s):  
M.A. Martín-Lara ◽  
L. Chica-Redecillas ◽  
A. Pérez ◽  
G. Blázquez ◽  
G. Garcia-Garcia ◽  
...  

In this work, liquid hot water pretreatment (autohydrolysis) was used to improve enzymatic hydrolysis of a commonly consumed vegetable waste in Spain, Italian green pepper, to finally produce fermentable sugars. Firstly, the effect of temperature and contact time on sugar recovery during pretreatment (in insoluble solid and liquid fraction) was studied in detail. Then, enzymatic hydrolysis using commercial cellulase was performed with the insoluble solid resulting from pretreatment. The objective was to compare results with and without pretreatment. The results showed that the pretreatment step was effective to facilitate the sugars release in enzymatic hydrolysis, increasing the global sugar yield. This was especially notable when pretreatment was carried out at 180 °C for 40 min for glucose yields. In these conditions a global glucose yield of 61.02% was obtained. In addition, very low concentrations of phenolic compounds (ranging from 69.12 to 82.24 mg/L) were found in the liquid fraction from enzymatic hydrolysis, decreasing the possibility of fermentation inhibition produced by these components. Results showed that Italian green pepper is an interesting feedstock to obtain free sugars and prevent the enormous quantity of this food waste discarded annually.


2020 ◽  
Vol 11 ◽  
pp. 100442
Author(s):  
Jose M. (Chema) Jimenez-Gutierrez ◽  
Luuk A.M. van der Wielen ◽  
Adrie J.J. Straathof

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6714-6723
Author(s):  
Peng Luo ◽  
Chuanmin Yang ◽  
Mengyao Li ◽  
Yueqi Wang

Rice husk has a water repellent wax layer on its surface and has high pH and buffering capacity, which inhibit surface adhesion and result in the poor strength and water resistance of rice husk particleboard bonded with water-borne urea formaldehyde (UF) resin. In this work, rice husks were pretreated with liquid hot water at different temperatures (130, 140, 150, and 160 °C) and residence times (10 and 20 min). Pretreated rice husks were used to produce particleboard with UF resin. The effects of liquid hot water pretreatment temperature and residence time on the wax contents and pH values were investigated. In addition, the buffering capacities of the rice husks and the mechanical properties and the water resistance of the rice husk particleboards were investigated. The results indicated that liquid hot water pretreatment remarkably reduced the wax contents, pH values, and buffering capacities of the rice husks. In addition, it improved the mechanical properties and water resistance of the rice husk particleboards. Liquid hot water pretreatment effectively improved bondability between rice husks and water-borne UF resin, and it enhanced the performance of the rice husk particleboard.


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