scholarly journals Influence of Biomass Pretreatment Process Time on Furfural Extraction from Birch Wood

2013 ◽  
Vol 11 ◽  
pp. 5-11 ◽  
Author(s):  
Prans Brazdausks ◽  
Maris Puke ◽  
Nikolajs Vedernikovs ◽  
Irena Kruma
Keyword(s):  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Biomass Pretreatment ◽  
Process Time ◽  
Birch Wood ◽  
Theoretical Yield ◽  
Theoretical Amount

Abstract Furfural is a biomass derived-chemical that can be used to replace petrochemicals. In this study, dilute sulphuric acid hydrolysis was used for hemicelluloses secession from birch wood. The reaction was investigated at different biomass treatment times (10-90 min, increasing it by 10 min). We found that the greatest amount of furfural 1.4-2.6%, which is 9.7-17.7% from theoretical possible yield, was formed in the first 30 min of the beginning of birch wood pentoses monosaccharide dehydration, but the greatest yield of furfural 10.3%, which is 70.0% from the theoretical yield, can be obtained after 90 min. Given that furfural yield generally does not exceed 50% from the theoretical amount, the result can be considered as very good.

Effect of the Acid Hydrolysis Temperature on the Conversion of Birch Wood Hemicelluloses into Furfural

2014 ◽  
Vol 604 ◽  
pp. 245-248 ◽  
Author(s):  
Prans Brazdausks ◽  
Nikolajs Vedernikovs ◽  
Maris Puke ◽  
Irena Kruma
Keyword(s):  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Dehydration Process ◽  
Birch Wood ◽  
Constant Amount ◽  
Hydrolysis Method ◽  
Hydrolysis Temperature

In this study, a new dilute sulphuric acid hydrolysis method was used for hemicelluloses secession from birch wood. The furfural extraction was investigated at different process temperatures (132°C ‑ 162°C, increasing it by 5°C) and at constant amount of catalyst 3.0%, calculated on oven‑dried wood. The greatest amount of furfural 11.09%, which is 75.6% from the theoretical possible yield, was formed at temperature 147°C after 90 min from the beginning of the birch wood pentoses monosaccharides dehydration process.

scholarly journals PEMBUATAN BIOETANOL DARI KUPASAN KENTANG (Solanum tuberosum L.) DENGAN PROSES FERMENTASI

Jurnal Kimia ◽  
2016 ◽  
Author(s):  
Devi Esteria Hasianna Purba ◽  
Iryanti Eka Suprihatin ◽  
A.A.I.A. Mayun Laksmiwati
Keyword(s):  
Gas Chromatography ◽  
Renewable Energy ◽  
Solanum Tuberosum ◽  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Solanum Tuberosum L ◽  
Alternative Source ◽  
Hydrolysis Process ◽  
Potato Peels ◽  
Detoxification Process

Ethanol fermented from potato peels is proposed as one alternative source of renewable energy called bioethanol. In this research bioethanol was produced through four stages namely acid hydrolysis, detoxification, fermentation and distillation. The acid hydrolysis process was carried out using sulphuric acid at 100oC for 60 minutes. The detoxification process was carried out by adding NH4OH into the hydrolyzate prior to fermentation. Distillation was performed up to 100oC and the distillate with the BP of 78-84oC was determined for its ethanol content using gas chromatography. The ethanol produced from 5 grams of dried potato peels through fermentation for 4, 5, 6, and 7 days 3.54%; 4,85%; 5,35%; and 6.15% respectively.

The synthesis of Cyclododecane-r-1,c-5,c-9-triamine and r-1,c-5,c-9-Tris(2,3-dimethoxybenzamido)cyclododecane

1975 ◽  
Vol 28 (3) ◽  
pp. 673 ◽  
Author(s):  
DJ Collins ◽  
C Lewis ◽  
JM Swan
Keyword(s):  
Aqueous Solution ◽  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Sodium Carbonate ◽  
Sodium Azide ◽  
Room Temperature ◽  
Dimethyl Formamide ◽  
Lithium Aluminium Hydride ◽  
Lithium Aluminium ◽  
Hydrolysis Of

Treatment of cyclododecane-r-1,c-5,c-9-triyl tris(p-toluenesulphonate) with sodium azide in dimethyl-formamide at 100� for 6 h gave the corresponding cis,cis-triazide which upon hydrogenation or reduction with lithium aluminium hydride gave cyclododecane-r-1,c-5,c-9-triamine, isolated as the tris-salicylidene derivative. Acid hydrolysis of this, removal of the salicylaldehyde, and treatment of the aqueous solution with sodium carbonate and 2,3-dimethoxybenzoyl chloride gave r-1,c-5,c- 9-tris(2,3-dimethoxybenzamido)cyclododecane. ��� Treatment of (E,E,E)-cyclododeca-1,5,9-triene with an excess of acetonitrile and sulphuric acid at room temperature for three days gave 18% of (E,E)-1-acetamidocyclododeca-4,8-diene; no di- or tri-amides were isolated.

Developing Ways of Obtaining Quality Hydrolyzates Based on Integrating Catalytic Peroxide Delignification and the Acid Hydrolysis of Birch Wood

2018 ◽  
Vol 10 (2) ◽  
pp. 142-151 ◽  
Author(s):  
B. N. Kuznetsov ◽  
N. V. Chesnokov ◽  
O. V. Yatsenkova ◽  
I. G. Sudakova ◽  
A. M. Skripnikov ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Birch Wood ◽  
Hydrolysis Of ◽  
Peroxide Delignification

scholarly journals Acid and Enzymatic Hydrolyses of Rice Bran for Bioethanol Production

ALCHEMY ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 24
Author(s):  
Dewi Yuliani ◽  
Khoirul Achmad Julianto ◽  
Akyunul Jannah
Keyword(s):  
Enzymatic Hydrolysis ◽  
Hydrochloric Acid ◽  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Rice Bran ◽  
Dilute Hydrochloric Acid ◽  
Cellulolytic Enzyme ◽  
Bioethanol Production ◽  
By Products ◽  
Sugar Source

<p class="BodyAbstract">Rice bran is one among many agricultural by-products containing ~50-60 wt.% of carbohydrate. The carbohydrate is a prominent sugar source for bioethanol production. The objective of this research was to study bioethanol production from rice bran by acid and enzymatic treatment. The variations of acid used were dilute hydrochloric acid and sulphuric acid, while variations of enzyme used were amylolytic and cellulolytic enzyme. Ethanol production of acid-hydrolyzed rice bran was 24.95±1.61% (v/v) by hydrochloric acid and 29.57±2.04% (v/v) by sulphuric acid. Ethanol produced by enzymatic hydrolysis was quite low i.e. 6.7±0.04%, and 8.86±0.29% (v/v) for amylolytic and cellulolytic hydrolysate, respectively.</p><p class="BodyAbstract"> </p><p>Keywords: Bioethanol, rice bran, acid hydrolysis, enzymatic hydrolysis</p>

Xylitol production from olive-pruning debris by sulphuric acid hydrolysis and fermentation with Candida tropicalis

Holzforschung ◽  
2011 ◽  
Vol 65 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Juan Francisco García Martín ◽  
Sebastián Sánchez ◽  
Vicente Bravo ◽  
Manuel Cuevas ◽  
Luc Rigal ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Candida Tropicalis ◽  
Agricultural Waste ◽  
Biomass Productivity ◽  
Specific Substrate ◽  
Substrate Uptake ◽  
Xylitol Production ◽  
Amorphous Cellulose ◽  
Glucose Ratio

AbstractThe debris of olive pruning is a renewable, low-cost and widely available agricultural waste. Its biochemical conversion by hydrolysis and fermentation was undertaken in the present study. Diluted acid hydrolysis was conducted in a heterogeneous stirred tank reactor at 90°C and at a low sulphuric acid concentration (0.0–1.0 N) for 300 min. To increase thed-xylose/d-glucose ratio into the hydrolysate, in another experiment amorphous cellulose and extracts were removed by means of a pretreatment in an extruder with 1 N H2SO4at 70°C before the acid hydrolysis. The fermentation of hydrolysates was performed under microaerobic conditions in a batch bioreactor at 30°C and pH 5 withCandida tropicalisNBRC 0618. The controlled fermentation parameters included maximum specific growth rate, biomass productivity, rate of the specific substrate uptake, rates of specific ethanol and xylitol production, and overall yield of ethanol and xylitol. In the presence of 1.0 N H2SO4, the fermentation of the pretreated hydrolysate led to specific xylitol production rates and overall xylitol yield (0.1 g g-1 h for t=25 h; 0.49 g g-1, respectively) higher than those achieved without pretreatment (0.03 g g-1 h for t=25 h; 0.39 g g-1, respectively). Under these conditions, 53 g xylitol kg-1of dry olive-pruning debris was obtained from the pretreated culture, whereas without pretreatment 70 g ethanol and 34 g xylitol were recovered.

Hemtacetal formation in sulphuric acid hydrolysis of a chloro olefin

1973 ◽  
Vol 14 (8) ◽  
pp. 585-588 ◽  
Author(s):  
E.P. Woo ◽  
K.T. Mak ◽  
H.N.C. Wong
Keyword(s):  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Hydrolysis Of

Kinetic studies of two-stage sulphuric acid hydrolysis of sugarcane bagasse

2015 ◽  
Vol 83 ◽  
pp. 850-858 ◽  
Author(s):  
Sachin Kumar ◽  
Pratibha Dheeran ◽  
Surendra P. Singh ◽  
Indra M. Mishra ◽  
Dilip K. Adhikari
Keyword(s):  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Sugarcane Bagasse ◽  
Kinetic Studies ◽  
Two Stage ◽  
Hydrolysis Of

A METHOD FOR THE DETERMINATION OF URINARY PREGNANEDIOL

1955 ◽  
Vol 12 (3) ◽  
pp. 209-219 ◽  
Author(s):  
A. KLOPPER ◽  
EILEEN A. MICHIE ◽  
J. B. BROWN
Keyword(s):  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Permanganate Oxidation ◽  
Proliferative Phase ◽  
Oxidation Step ◽  
Chromatographic Procedure ◽  
Post Menopausal

SUMMARY A new chromatographic procedure for determining small amounts of pregnanediol in urine is described. The method involves (1) acid hydrolysis, (2) toluene extraction, (3) a new permanganate oxidation step, (4) chromatography on alumina columns, (5) acetylation, (6) further chromatography on alumina, and (7) colorimetry after developing a colour with sulphuric acid. The method is considered under the headings of specificity, sensitivity, accuracy and convenience. The significance of results obtained from male, proliferative phase female, and post-menopausal urine is discussed.

scholarly journals The sulphuric acid hydrolysis of butter-fats

The Analyst ◽  
1893 ◽  
Vol 18 (July) ◽  
pp. 165b
Author(s):  
S. Rideal
Keyword(s):  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Hydrolysis Of
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