نتایج جستجو برای: cellulose sulfuric acid
تعداد نتایج: 772698 فیلتر نتایج به سال:
in order to find the most effective method to overcome seed dormancy in teucrium chamaedrys l. medicinal plant species the effect of some chemical and physical breaking methods including: cold stratification (5 °c), scarification with sandpaper, stratification with needle, concentrated sulfuric acid, gibberellic acid and combination of these methods were investigated. treated seeds along with ...
BACKGROUND Use of lignocellulosic biomass has received attention lately because it can be converted into various versatile chemical compounds by biological processes. In this study, a two-step pretreatment with dilute sulfuric acid and aqueous ammonia was performed efficiently on rice straw to obtain fermentable sugar. The soaking in aqueous ammonia process was also optimized by a statistical m...
BACKGROUND Biomass use for the production of bioethanol or platform chemicals requires efficient breakdown of biomass to fermentable monosaccharides. Lignocellulosic feedstocks often require physicochemical pretreatment before enzymatic hydrolysis can begin. The optimal pretreatment can be different for different feedstocks, and should not lead to biomass destruction or formation of toxic produ...
This study evaluated a cost-effective approach for the conversion of rice straw into fermentable sugars. The composition of rice straw pretreated with 1 % sulfuric acid or 1 % sodium hydroxide solution was compared to rice straw with no chemical pretreatment. Enzymatic saccharification experiments on non-pretreated rice straw (NPRS), pretreated rice straw (PRS), and pretreated rice straw with a...
Cellulose nanocrystals (CNCs) were prepared by acidic hydrolysis of cotton fibers (Whatman #1 filter paper). In our efforts to select conditions in which the hydrolysis media does not install labile protons on the cellulose crystals, a mineral acid other than sulfuric acid (H2SO4) was used. Furthermore, in our attempts to increase the yields of nanocrystals ultrasonic energy was applied during ...
Ferric Species Standard ferric sulfate solutions were prepared by dissolving spectrographically pure iron rod (Johnson Matthey) in sulfuric acid and oxidizing with hydrogen peroxide. The decadic molar extinction coefficient of ferric ion in 0.8 N sulfuric acid at 24.9?C was found to be 2199 ? 4 liters mole-' cm-l at 304 m,/. The effect of a decrease of acidity and of added ferrous and cupric su...
Sulfuric acid is widely recognized as a very important substance driving atmospheric aerosol nucleation. Based on quantum chemical calculations it has been suggested that the quantitative detection of gas phase sulfuric acid (H2SO4) by use of Chemical Ionization Mass Spectrometry (CIMS) could be biased in the presence of gas phase amines such as dimethylamine (DMA). An experiment (CLOUD7 campai...
Sulfuric acid-catalyzed hydrolysis of cellulose commonly isolates nanocrystals (CNCs). Neutralizing the reactant solution with sodium hydroxide facilitates efficient downstream processing, but residual salt remains in product. This study examines reinforcing effects CNCs from suspensions that contain on mechanical properties thermoplastic starch nanocomposites. By films up to 5 wt% CNCs, stiffn...
The raw material used for this NCC production was oil palm empty bunches (OPEFB), currently waste from plantations. Delignification of OPEFB carried out using 2 N NaOH solution at 70oC 6 hours. maximum yield is 62.1% (dry cellulose basis) obtained a concentration 54% sulfuric acid and temperature 50oC. addition plasticizers (glycerol PEG) reduced the elastic modulus capsules 7951.4 MPa to 4758 ...
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