Liquefaction of Bamboo Polyhydric Alcohols and its Application in Polyurethane Foam Materials

2013 ◽  
Vol 781-784 ◽  
pp. 632-635
Author(s):  
Jin Ping Zhang ◽  
Meng Hao Du ◽  
Li Song Hu
Keyword(s):  
Compressive Strength ◽  
Sulfuric Acid ◽  
Polyethylene Glycol ◽  
Polyurethane Foam ◽  
Mass Fraction ◽  
Elasticity Modulus ◽  
Mass Ratio ◽  
Polyethylene Glycol 400 ◽  
Polyhydric Alcohols ◽  
Bamboo Powder

Liquefy bamboo powder with the liquefacient of polyethylene glycol 400 and glycerin, and use the obtained liquefied product for preparing polyurethane foam materials. Results indicate that: 1) liquefaction ratio will be the highest when the proportion of PEG400 and glycerin is 80/20; 2) when the bamboo is liquefied, liquefied effect will be better if the mass ratio of bamboo powder and polyhydric alcohols is above 1: 4; 3) liquefaction ratio will be the highest when it is liquefied for 120min with 3% mass fraction of the catalyst--sulfuric acid and 170°C liquefied temperature; 4) hydroxyl value of the liquefied product of bamboo powder is 333.8mgKOH/g; 5) through the adjustment of foaming formula and technology, compressive strength of polyurethane plate with the thickness of 10mm and with the density of polyurethane foam materials of 0.4g/cm3, which is obtained from bamboo powder liquefied product is 17MPa, and the elasticity modulus is 1000MPa.

Microwave Liquefaction for Bamboo Powder Polyhydric Alcohols and Preparation of Polyether Glycol

2013 ◽  
Vol 726-731 ◽  
pp. 151-155
Author(s):  
Jin Ping Zhang ◽  
Meng Hao Du ◽  
Li Song Hu
Keyword(s):  
Sulfuric Acid ◽  
Polyethylene Glycol ◽  
Mass Fraction ◽  
Mass Ratio ◽  
Solid Mass ◽  
Polyethylene Glycol 400 ◽  
Polyhydric Alcohols ◽  
Bamboo Powder ◽  
Liquefaction Process ◽  
Single Factor Experiment

The bamboo powder is liquefied by microwave heating with polyethylene glycol (400), glycerin and EC as liquefiers and sulfuric acid as a catalyst. The microwave liquefaction process for bamboo powder polyhydric alcohols is studied with the single factor experiment to determine the optimal liquefaction conditions, which is: mass ratio of polyethylene glycol (400) and glycerin is 80:20; the liquefaction rate is 99% in the liquid-solid mass fraction at 4:1, sulfuric acid mass fraction at 3%, and microwave power at 800W for 15 minute reaction. Hydroxyl value for liquefied product of bamboo powder polyhydric alcohols is 300-400mgKOH/g. Analysis of liquefied products by infrared spectrum and GC-MS shows there are a great many such compounds as alcohol ethers and esters in liquefied products.

Study on Preparation of Solid Concrete Brick with Recycled Aggregate

2013 ◽  
Vol 648 ◽  
pp. 108-111
Author(s):  
Qi Jin Li ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Mass Fraction ◽  
Recycled Aggregate ◽  
Preparation Process ◽  
Mass Ratio ◽  
Construction Waste ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Optimal Value

The construction waste was processed into recycled aggregate to produce solid construction waste brick with grade of MU20. The preparation process of recycled aggregate and the optimal value of mass ratio of water to cement (water cement ratio) and mass ratio of recycled aggregate to cement was studied. The results shows that when the water cement ratio is 0.86 and the mass ratio of recycled aggregate to cement is 5.5 and the dosage of activator is 0.25% (mass fraction with recycled aggregate), the compressive strength of sample is 22.5MPa and can be satisfied with the requirement of MU20 solid concrete brick.

Study on Liquefaction of Corncob in Polyhydric Alcohols

2011 ◽  
Vol 183-185 ◽  
pp. 1110-1113
Author(s):  
Yuan Bo Huang ◽  
Yun Wu Zheng ◽  
Hao Feng ◽  
Zhi Feng Zheng ◽  
Ying Zi Jiang
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Acid Number ◽  
Mass Ratio ◽  
Hydroxyl Number ◽  
Catalyst Amount ◽  
Peg 400 ◽  
Polyhydric Alcohols ◽  
Liquid Products

The liquefaction of corncob in polyhydric alcohols was investigated by using sulfuric acid as a catalyst. Results showed that the best liquefaction could be obtained with residue percent of 4.5% under the conditions with the corncob/polyhydric alcohols mass ratio of 1/5, reaction temperature of 150°C, reaction time of 60 min, catalyst amount of 3% (based on the weight of corncob), PEG 400/glycerin mass ratio of 7/3 in the polyhydric alcohols, respectively. The liquefied liquid products had acid number of 18.9 mg KOH/g and hydroxyl number of 616.3mg KOH/g, respectively.

Study on Preparation of Construction Waste Paving Brick

2013 ◽  
Vol 712-715 ◽  
pp. 913-916
Author(s):  
Lan Xi Wang ◽  
Guang Hui Pan ◽  
Fu Yong Li ◽  
Hai Ming Wang ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Mass Fraction ◽  
Raw Material ◽  
Recycled Aggregate ◽  
Analysis Method ◽  
Mass Ratio ◽  
Construction Waste ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Orthogonal Analysis

The construction waste was processed into recycled aggregate to produce paving brick with grade of Cc40. The influences of raw material ratio on the compressive strength of construction waste paving brick were studied with orthogonal analysis method. The results show that the optimum raw material ratio are as follows: mass ratio of recycled aggregate to cement is 3.0, water cement ratio 0.30, compound activator 1.1% (mass fraction of cement, the same below), interfacial agent 0.6%, and water reducing agent of 0.5%. In addition, mechanisms of the admixtures were further studied by SEM and EDS.

Bamboo Liquefaction with Polyhydric Alcohols and its Application in Flexible Polyurethane Foam

2012 ◽  
Vol 524-527 ◽  
pp. 2113-2117 ◽  
Author(s):  
Jin Ping Zhang ◽  
Meng Hao Du ◽  
Li Song Hu
Keyword(s):  
Electron Microscope ◽  
Infrared Spectrum ◽  
Polyurethane Foam ◽  
Mass Ratio ◽  
Polyhydric Alcohols ◽  
Designed Experiment ◽  
Flexible Polyurethane Foam ◽  
Liquefaction Temperature ◽  
Flexible Polyurethane ◽  
Scanning Electron

Using PEG400 and glycerol as liquefacient, the residue from bamboo processing was liquefied at the presence of a catalyst. Liquefaction technology of residue from bamboo processing in polyhydric alcohols was studied by orthogonally-designed experiment, and the liquefaction products were applied in the preparation of flexible polyurethane foam. The result showed that liquefaction rate could reach as high as 99.32% when liquefaction temperature was 160°C, mass ratio of liquid to solid was 4:1 and liquefaction time was 90min. Hydroxyl value of liquefaction products obtained was 56.63mgKOH/g and viscosity was 300mPa•s. Flexible polyurethane foam prepared from liquefaction products was analyzed with infrared spectrum and scanning electron microscope, and was compared with conventional flexible polyurethane foam.

Synthesis of 2-Pyridyl Tribromomethyl Sulfone

2013 ◽  
Vol 781-784 ◽  
pp. 272-275
Author(s):  
Zhen Ming Zhang ◽  
Run Lai Li ◽  
Shuan Li ◽  
Pei Liu ◽  
Kai Kai Song
Keyword(s):  
Polyethylene Glycol ◽  
Melting Point ◽  
Sodium Hypochlorite ◽  
Phase Transfer ◽  
Resonance Spectrum ◽  
Probable Mechanism ◽  
Molar Ratio ◽  
Mass Ratio ◽  
Optimum Conditions ◽  
Polyethylene Glycol 400

Polyethylene glycol-400 was used as phase transfer catalyst in reaction of dichloropyridine and sodium thiomethoxide to form 2-methylthiopyridine with a yield of 97.8%. Then 2-methylthiopyridine and sodium hypochlorite were added respectively to oxidize and bromize it to synthesis 2-Pyridyl tribromomethyl sulfone, with the purity of 99.6% and yield of 93.3%. Mass ratio of dichloropyridine versus polyethylene glycol-400 is 1:0.18, and molar ratio of dichloropyridine versus sodium thiomethoxide is 1:1.2. The optimum conditions to prepare sodium hypochlorite are a temperature at-5 to 0 °C, a molar ratio of bromine versus sodium hydroxide being 1:4. Proved optimum conditions to synthesis 2-pyridyl tribromomethyl sulfone are a temperature at (80±1)°C, reaction time for 5 hours and the molar ratio of 2-methylthiopyridine versus bromine being 1:6.58. Probable mechanism of synthetizing 2-methylthiopyridine was speculated, properties with structure of resultant substances were characterized by melting point apparatus, IR spectra and magnetic resonance spectrum.

Liquefaction of CCA-treated wood and elimination of metals from the solvent by precipitation

Holzforschung ◽  
2005 ◽  
Vol 59 (3) ◽  
pp. 285-288 ◽  
Author(s):  
Lianzhen Lin ◽  
Chung-Yun Hse
Keyword(s):  
Sulfuric Acid ◽  
Polyethylene Glycol ◽  
Treated Wood ◽  
Toxic Metal ◽  
Chromated Copper Arsenate ◽  
Polyethylene Glycol 400 ◽  
Copper Arsenate

Abstract Spent chromated copper arsenate (CCA)-treated wood was liquefied in polyethylene glycol 400/glycerin (2:1w/w). Sulfuric acid (95–98%) and ferrous salts (FeSO4·7H2O or FeCl2·4H2O) were used as catalysts and additives, respectively. The resulting liquefied CCA-treated wood was diluted with aqueous solvents and was then mixed with complexion/precipitation agents, followed by precipitation or filtration to remove the toxic metal-bearing sediment. As a result, more than 90% of Cu, Cr or As was removed.

Development, Evaluation and Optimization of Osmotic Controlled Tablets of Aceclofenac for Rheumatoid Arthritis Management

2019 ◽  
Vol 9 (1) ◽  
pp. 29-36
Author(s):  
Bijaya Ghosh ◽  
Niraj Mishra ◽  
Preeta Bose ◽  
Moumita D. Kirtania
Keyword(s):  
Rheumatoid Arthritis ◽  
Polyethylene Glycol ◽  
Sodium Chloride ◽  
Cellulose Acetate ◽  
Hydroxypropyl Methylcellulose ◽  
Release Profile ◽  
Polyethylene Glycol 400 ◽  
Permeable Membrane ◽  
Cumulative Release ◽  
The Core

Objective: Rheumatoid arthritis is a dreaded disease, characterized by pain, inflammation and stiffness of joints, leading to severe immobility problems. The disease shows circadian variation and usually gets aggravated in early morning hours. Aceclofenac, a BCS Class II compound is routinely used in the treatment of pain and inflammation associated with rheumatoid arthritis. The objective of this study was to develop an osmotic delivery system of Aceclofenac that after administration at bedtime would deliver the drug in the morning hours. </P><P> Methods: A series of osmotically controlled systems of aceclofenac was developed by using lactose, sodium chloride and hydroxypropyl methylcellulose K100M as osmogens. Cellulose acetate (2% w/v in acetone) with varying concentrations of polyethylene glycol-400 was used as the coating polymer to create semi permeable membrane and dissolution was carried out in 290 mOsm phosphate buffer. Formulation optimization was done from four considerations: cumulative release at the end of 6 hours (lag time), cumulative release at the end of 7 hours (burst time), steady state release rate and completeness of drug release. </P><P> Results: A formulation having swelling polymer hydroxypropyl methylcellulose in the core and lactose and sodium chloride as osmogens, polyethylene glycol-400 (16.39 %) as pore former, with a coating weight of 5% was a close fit to the target release profile and was chosen as the optimum formulation. Conclusion: Aceclofenac tablets containing lactose, HPMC and sodium chloride in the core, given a coating of cellulose acetate and PEG-400 (5% wt gain), generated a release profile for optimum management of rheumatoid arthritic pain.

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