Separation of high-purity syringol and acetosyringone from rice straw-derived bio-oil by combining the basification-acidification process and column chromatography

2016 ◽  
Vol 37 (19) ◽  
pp. 2522-2530 ◽  
Author(s):  
Shilai Hao ◽  
Kaifei Chen ◽  
Leichang Cao ◽  
Xiangdong Zhu ◽  
Gang Luo ◽  
...  
Keyword(s):  
Rice Straw ◽  
Column Chromatography ◽  
High Purity ◽  
Bio Oil

Characterization of column chromatography separated bio-oil obtained from hydrothermal liquefaction of Spirulina

Fuel ◽  
2021 ◽  
Vol 297 ◽  
pp. 120695
Author(s):  
Jiahui Han ◽  
Xing Li ◽  
Shengyan Kong ◽  
Guang Xian ◽  
Hualong Li ◽  
...  
Keyword(s):  
Column Chromatography ◽  
Hydrothermal Liquefaction ◽  
Bio Oil

scholarly journals Experimental Study On Pyrolysis of Rice Straw Catalyzed By CaO/Al2O3-Phosphate Mixture

2021 ◽  
Author(s):  
Lianlian Xu ◽  
Zhongwen Xu ◽  
Feng Zhang ◽  
Yinmei Yuan ◽  
Bin Cheng ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gas Chromatography ◽  
Acetic Acid ◽  
Rice Straw ◽  
Mass Spectrometer ◽  
Synergistic Effects ◽  
Pyrolysis Gas ◽  
Pyrolysis Gas Chromatography ◽  
Dehydration Reactions ◽  
Bio Oil

Abstract This paper studied the synergistic effects of CaO or Al2O3 and three potassium phosphates (e.g., KH2PO4, K2HPO4·3H2O and K3PO4·3H2O) in the rice stalk pyrolysis through pyrolysis-gas chromatography-mass spectrometer (Py-GC/MS) experiments. The results show that after co-catalyzed by CaO/Al2O3 and potassium phosphates, the total contents of phenols, aldehydes, acids, LG from most samples decrease and those of ketones increase compared with those catalyzed by potassium phosphates alone. CaO/Al2O3 and potassium phosphates show synergistic effects in the regulation of the types or contents of phenols, ketones, aldehydes, etc. and are suitable for the production of ketone-rich bio-oil. Dehydration reactions, etc. are further promoted under the co-catalysis of the two catalysts, and some phenols can be converted to benzene products, etc. The contents of acetic acid can decrease to 0. For 50% K3PO4.3H2O impregnated sample, the yields of furans reduce sharply after CaO addition. For most impregnated samples except 50% K2HPO4·3H2O sample and 30%, 50% K3PO4.3H2O, the contents of total furans and furfural increase after Al2O3 addition.

scholarly journals Isolation of high purity 73Se using solid phase extraction after selective 4,5-[73Se]benzopiazselenol formation with aminonaphthalene

2018 ◽  
Vol 106 (6) ◽  
pp. 497-505 ◽  
Author(s):  
Uwe Königs ◽  
Swen Humpert ◽  
Ingo Spahn ◽  
Syed M. Qaim ◽  
Bernd Neumaier
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfur Dioxide ◽  
Solid Phase Extraction ◽  
Arsenic Trioxide ◽  
Column Chromatography ◽  
High Purity ◽  
Solid Phase ◽  
Phase Extraction ◽  
Recovery Yield ◽  
Efficient Process

AbstractA fast and efficient process for the production of the PET radionuclide73Se was developed using75Se as a surrogate.75Se was separated from proton irradiated arsenic trioxide by reaction with 2,3-diaminonaphthalene to 4,5-[75Se]benzopiazelenol. This compound was purified using SPE column chromatography and subsequently decomposed with hydrogen peroxide. For further chemical conversions [75Se]selenite was reduced to elemental [75Se]selenium by either using thiosulfate or sulfur dioxide. The recovery yield of75Se from the target amounted to 43%. The utility of the isolated75Se for radiosyntheses was demonstrated by the successful preparation of [75Se]selenomethionine. The methodology developed using75Se was successfully transformed to73Se.

Pyrolysis of Rice Straw by Using Microwave Irradiation with Quartz Glass Reactor

2016 ◽  
Vol 673 ◽  
pp. 203-212
Author(s):  
K. Azduwin ◽  
Z. Zarina ◽  
Mohd Jamir Mohd Ridzuan ◽  
Anis Atikah Ahmad
Keyword(s):  
Particle Size ◽  
Microwave Irradiation ◽  
Rice Straw ◽  
Quartz Glass ◽  
Microwave Power ◽  
Microwave Absorber ◽  
Parameter Study ◽  
Bio Oil ◽  
Microwave System ◽  
Work Done

Pyrolysis of rice straw using microwave irradiation with quartz glass reactor has been conducted in a 1 kW domestic microwave system having 2450 MHz frequency. The microwave was modified and was equipped with the cylindrical quartz glass reactor. There are three process parameter studied namely microwave power (watt), the amount of microwave absorber (g), and particle size (μm). The microwave absorber used in this study is char which produced from microwave assisted pyrolysis. From the study, it was found that the addition of microwave absorber had significant effects on the yields and properties of the final products. From the work done, 12.97 % of bio-oil yield was the highest amount of bio-oil produced at microwave power of 500 W, with addition of 0.5 g of microwave absorber (bio char) for the particle size of 125 μm with consistent flow of 5 L/min of nitrogen gas and constant of 10 minutes reaction time. The pH analysis of bio oil was done by using pH meter for randomly selected one reading for each parameter study where the pH of bio oil produced is acidic which is 3.11, 3.18 and 3.86. The bio-oil produced was found to contain important chemical compounds such as cyclohexanol, 2,3-dihydro-1-benzofuran, 2-methoxy-4-vinylphenol and 4-ethylphenol which analyzed by using gas chromatography.

scholarly journals Pemurnian diasilgliserol dari produk gliserolisis minyak sawit mentah dengan kromatografi kolom Purification of diacylglycerol from glycerolysis products of crude palm oil using column chromatography

2016 ◽  
Vol 79 (1) ◽  
Author(s):  
. TRI-PANJI ◽  
. SUHARYANTO ◽  
Urip PERWITASAR
Keyword(s):  
Fatty Acid ◽  
Free Fatty Acid ◽  
Stationary Phase ◽  
Column Chromatography ◽  
Palm Oil ◽  
High Purity ◽  
Rhizopus Oryzae ◽  
Optimal Concentration ◽  
Crude Palm Oil ◽  
Scale Experiment

AbstractVegetable oil enriched with diacylglycerol (DAG) isknown as healthy oil. This oil is much more expensive thancooking oil. Production of DAG could be performed byglycerolysis process of CPO using specific lipase of 1,3-glyceride from Rhizopus oryzae mold. Product derived fromglycerolysis process of CPO is a mixture of DAG, mono-acylglycerol (MAG), free fatty acid (FFA) and residual ofunglycerolysed triacylglyserol (TAG). Therefore the DAGproduct has to be isolated from other components in order toget high purity of DAG. The objective of the research was topurify and to find out optimal concentration of DAG derivedfrom a mixture product of CPO glycerolysis at laboratoryscale experiment (total reactant for glycerolysis was93.8 mL) and semipilot scale experiment (10 times oflaboratory scale) using column chromatography with silicagel as stationary phase. The research showed that thehighest DAG content could be collected at fraction of 26 th i.e65%, while at semipilot scale experiment the highest contentof DAG (97%) was achieved at 64 to 66th fraction.Reglycerolysis of residual CPO only yielded 8.24%glycerolysis product which was much lower than that of thefirst glycerolysis reaching 46.67%. The highest DAG derivedfrom the second reglycerolysis product was achieved at 24 thfraction reaching 35.71 % .AbstrakMinyak nabati kaya kandungan diasilgliserol (DAG)dikenal sebagai minyak sehat (healthy oil). Minyak ini jauhlebih mahal dari minyak makan biasa. Produksi DAG dapatdilakukan dengan proses gliserolisis CPO menggunakanenzim lipase spesifik 1,3-gliserida dari kapang Rhizopusoryzae. Produk gliserolisis CPO triasilgliserol adalahcampuran DAG, monoasilgliserol (MAG) dan asam lemakbebas (ALB) serta residu triasilgliserol (TAG) yang tidaktergliserolisis. Oleh karena itu DAG yang terbentuk harusdipisahkan dari komponen lainnya agar diperoleh fraksi DAGdengan kemurnian tinggi. Penelitian ini bertujuan untukmemurnikan dan menetapkan konsentrasi DAG yang dapatdiperoleh dari gliserolisis CPO skala lab (total reaktan93,8 mL) dan skala semipilot (10 kali skala laboratorium)dengan kromatografi kolom menggunakan fase padat silikagel. Residu TAG dari gliserolisis pertama digunakan untukgliserolisis kedua atau gliserolisis ulang. Hasil penelitianmenunjukkan bahwa fraksi DAG dengan konsentrasitertinggi diperoleh pada fraksi ke-26 yaitu sebesar 65%,sedangkan pada percobaan dengan skala semipilot (10 kaliskala laboratorium) diketahui bahwa konsentrasi DAGtertinggi (97%) diperoleh pada fraksi ke-64 sampai denganke-66. Gliserolisis kedua dari residu CPO hanya mampumenghidrolisis TAG menjadi campuran DAG, MAG danALB sekitar 8,24%, lebih kecil dari reaksi gliserolisispertama yaitu sebesar 46,67%. DAG tertinggi yang berhasildikumpulkan dari produk gliserolisis kedua adalah padafraksi ke-24 yaitu sebesar 35,71% .

scholarly journals The Effect of pyrolysis conditions to produce levoglucosan from rice straw

2018 ◽  
Vol 67 ◽  
pp. 03026
Author(s):  
Aji Satria Nugraha ◽  
Setiadi ◽  
Tania Surya Utami
Keyword(s):  
Rice Straw ◽  
Maximum Yield ◽  
Fixed Bed ◽  
Intermediate Compound ◽  
Holding Time ◽  
Fixed Bed Reactor ◽  
Industrial Sectors ◽  
Bio Oil ◽  
Cellulose Component ◽  
Derivative Products

The industrial sectors that produce synthetic chemicals and and polymers rely heavily on fossil resources. Rice straw is very abundant in Indonesia and can be used as a substitute for fossil resources to produce petrochemical precursors. It is known that cellulose component is the main source for LG formation. Due to high contain of cellulose, the potential of rice straw can be transform by pyrolysis to produce bio-oils and derivative products towards levoglucosan (LG) should be developed. Levoglucosan is an important intermediate compound as it can be convert to the precursor of bio-polymer adipic acid, bio-ethanol, etc. Nowadays it’s still rarely research focused on this mechanism route producing LG through pyrolysis. LG then can run into a further reaction and produce derivative products. In order to obtain the highest yield of LG in bio-oil, a condition that may inhibit the further reaction of LG during pyrolysis takes place. The factor of biomass source and composition, temperature, and holding time (adjusted by N2 feed) most likely greatly affect the product composition formed at the end of pyrolysis. In this study, fast-pyrolysis of rice straw was performed in fixed-bed reactor (5 grams of biomass) under different temperature ranges (450 to 600 °C), N2 flow rate (1200 to 1582 ml/min) to maximize the yield of LG. The content of LG on bio-oil was measured by GC-MS instrument. The maximum yield of LG (67.78% of area) was obtained at an optimal temperature of 500°C with holding time of 1.35 s.

High Purity Isolation and Quantification of Semiconducting Carbon Nanotubes via Column Chromatography

ACS Nano ◽  
2013 ◽  
Vol 7 (4) ◽  
pp. 2971-2976 ◽  
Author(s):  
George S. Tulevski ◽  
Aaron D. Franklin ◽  
Ali Afzali
Keyword(s):  
Carbon Nanotubes ◽  
Column Chromatography ◽  
High Purity

Application of nanostuctured materials as acid-catalysts in rice straw pyrolysis for bio-oil production

2008 ◽  
Author(s):  
Phuong T. Dang ◽  
Hy G. Le ◽  
Thang C. Dinh ◽  
Thang V. Hoang ◽  
Linh H. T. Bui ◽  
...  
Keyword(s):  
Rice Straw ◽  
Oil Production ◽  
Acid Catalysts ◽  
Bio Oil
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