Beech wood chips were treated with

Beech wood chips were treated with water and water solutions of alkaline chemicals at
elevated temperature in order to extract a part of hemicelluloses. The extractions were performed
at 160°C, chemicals charge 3 % Na2O on o.d. wood; H-factor was changed in the range from 0 to
850 hrs. Dissolution rate of wood components was highest in case of extraction with water followed
by extraction with NaOH solution, green liquor (GL), sodium acetate (NaAc), NaHCO3 and
Na2CO3. With increasing H-factor pH of extracts decreased; highest decrease was in extraction
with water followed by extraction with solutions of NaAc, NaOH, GL, Na2CO3 and NaHCO3.
At of 10 % wood weight loss pH of extract decreased in extraction with water to 3.9 whereas in
extraction with NaAc to pH 5.1, with NaOH to 5.5, Na2CO3 to 5.6, with GL to 6.4 and with
NaHCO3 to pH 6.6. Under these conditions the total content of sugars in the hydrolysed extract
after extraction with water was 6.1 % on o.d. wood; out of this xylose content was 4.6 % on o. d.
wood. In extraction with solutions of NaOH, GL, NaAc, NaHCO3, Na2CO3 the total content
of sugars was in the range 2.05 to 3.3 % on o.d. wood and xylose content was 1.85 to 2.85 % on
o.d. wood. In extraction with alkaline solutions glucose content in hydrolysed extracts was 0.24
to 0.34 % on o.d. wood, what is approximately by half lower than in extraction with water. Lignin
content in extracts was 0.8 % to 1.2 % on o.d. wood; insoluble solids content was in the range
0.55 % to 1.8 % on o.d. wood.
KEYWORDS: Beech wood, autohydrolysis, alkaline extraction, hemicelluloses, xylose, glucose,
lignin, insoluble solids, furfural

ผลลัพธ์ (อังกฤษ) 2:

Wood chips were treated with beech Water and Water Solutions of alkaline chemicals at
Elevated Temperature in Order to Extract a Part of hemicelluloses. The extractions were performed
at 160 ° C, chemicals Na2O charge 3% on od Wood; H-factor was changed in the Range from 0 to
850 hrs. Dissolution rate was highest in Case of Wood components of extraction with Water followed
by extraction with NaOH Solution, Green Liquor (GL), Sodium acetate (NAAC), NaHCO3 and
Na2CO3. With increasing H-factor pH of extracts decreased; highest decrease was in extraction
with Water followed by extraction with Solutions of NAAC, NaOH, GL, Na2CO3 and NaHCO3.
At of 10% Wood weight Loss pH of Extract Decreased in extraction with Water to 3.9 whereas in
extraction with NAAC to pH 5.1, with. NaOH to 5.5, 5.6 to Na2CO3, with GL to 6.4 and with
NaHCO3 to pH 6.6. Under these conditions the total content of sugars in the hydrolysed Extract
Water was after extraction with 6.1% on od Wood; Xylose out of this content was 4.6% on od
Wood. In extraction with Solutions of NaOH, GL, NAAC, NaHCO3, Na2CO3 the total content
of sugars was 3.3% in the Range to two five on od Wood and Xylose content was 1.85 to 2.85% on
od Wood. In extraction with alkaline Solutions glucose content in hydrolysed extracts was .24
to twelve thirty-four% on od Wood, Half Lower than in what is approximately by extraction with Water. Lignin
content in extracts was 0.8% to 1.2% on od Wood; insoluble solids content was in the Range
0.55% to 1.8% on od Wood.
KEYWORDS: Beech Wood, Autohydrolysis, alkaline extraction, hemicelluloses, Xylose, glucose,
lignin, insoluble solids, furfural.

ผลลัพธ์ (อังกฤษ) 3:

Beech wood chips were treated with water and water solutions of alkaline chemicals at
elevated temperature in order to. Extract a part of hemicelluloses. The extractions were performed
at 160 ° C chemicals charge, 3% Na2O on O.D. Wood; H-factor. Was changed in the range from 0 to
850 hrs. Dissolution rate of wood components was highest in case of extraction with. Water followed
.By extraction with, NaOH solution green liquor (GL), sodium acetate (NaAc), NaHCO3 and
Na2CO3. With increasing H-factor. PH of extracts decreased; highest decrease was in extraction
with water followed by extraction with solutions, of NaAc. ,, NaOH GL Na2CO3 and NaHCO3.
At of 10% wood weight loss pH of extract decreased in extraction with water to 3.9 whereas. In
extraction with NaAc to, pH 5.1With NaOH to 5.5 Na2CO3 5.6, to, GL with to 6.4 and with
NaHCO3 to pH 6.6. Under these conditions the total content of. Sugars in the hydrolysed extract
after extraction with water was 6.1% on O.D. Wood; out of this xylose content was 4.6% on. O. D.
wood. In extraction with solutions of NaOH GL NaAc,,,, NaHCO3 Na2CO3 the total content
of sugars was in the range 2.05 to 3.3% on. O.D.Wood and xylose content was 1.85 to 2.85% on
O.D. Wood. In extraction with alkaline solutions glucose content in hydrolysed. Extracts was 0.24
to 0.34% on O.D. Wood what is, approximately by half lower than in extraction with water. Lignin
content. In extracts was 0.8% to 1.2% on O.D. Wood; insoluble solids content was in the range
0.55% to 1.8% on O.D. Wood.
KEYWORDS:? Beech, woodAutohydrolysis alkaline extraction hemicelluloses,,,,,, xylose glucose
lignin, insoluble solids furfural.