Preparation of Polymer Suppressant in Coal Transportation under Single Mode Microwave Irradiation

2012 ◽  
Vol 198-199 ◽  
pp. 19-22
Author(s):  
Shui Li Lai ◽  
Ying Hua Gao ◽  
Qiang Chai
Keyword(s):  
Acrylic Acid ◽  
Microwave Irradiation ◽  
Irradiation Time ◽  
Weight Ratio ◽  
Single Mode ◽  
Solution Polymerization ◽  
Oxidized Starch ◽  
Irradiation Power ◽  
Aqueous Solution Polymerization ◽  
Radiation Time

The aqueous solution polymerization of acrylic acid, acrylamide and oxidized starch under single mode microwave irradiation was studied, and a polymer suppressant was synthesized. The factors that influence on performance of the polymer suppressant were discussed, including microwave irradiation time, neutralization degree of acrylic acid (AA), the dosage of oxidized starch. The polymer suppressant was characterized by IR and scanning electron microscopy (SEM). Results indicated that the optimal synthetic conditions are as follows: microwave irradiation power, 300 W; radiation time, 2 mins; 50% neutralization degree of the AA; m(AA) : m(AM) : m(oxidized starch)= 5.0 : 3.3 : 3.4, weight ratio initiator in the feed is 0.4%, respectively.

Synthesis of P(AA-AM)/ Organic Montmorillonite Super Absorbent Resin under Focused Signal-Mode Microwave Irradiation

2013 ◽  
Vol 746 ◽  
pp. 137-141
Author(s):  
Shui Li Lai ◽  
Ying Hua Gao
Keyword(s):  
Microwave Irradiation ◽  
Cetyltrimethylammonium Bromide ◽  
Irradiation Time ◽  
Single Mode ◽  
Synthesis System ◽  
Organic Montmorillonite ◽  
Irradiation Power ◽  
Aqueous Solution Polymerization ◽  
Signal Mode ◽  
Irradiation Technology

A super absorbent resin (SAR) of acrylic acid (AA)/acrylamide (AM) /organic montmorillonite (OMMT) composite was synthesized by aqueous solution polymerization. This process was carried out under precision microwave organic synthesis system and its single-mode focusing microwave irradiation technology was studied. The montmorillonite (MMT) was modified by treating with cetyltrimethylammonium bromide. Moreover, the factors that effect on liquid absorbency rate of the SAR were discussed, such as neutralization degree (ND) of AA, microwave irradiation time, microwave irradiation power and the dosage of the OMMT. It gave the best liquid absorbency rate (1520g.g-1 and 165g.g-1 in purified water and 0.9wt% NaCl solution, respectively).

Preparation and Application of Polymer Dust Suppressants in Coal Transportation under Microwave Irradiation

2011 ◽  
Vol 396-398 ◽  
pp. 1632-1635 ◽  
Author(s):  
Shui Li Lai ◽  
Qiang Chai ◽  
Bin Wang ◽  
Ning Yang
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Corrosion Resistance ◽  
Microwave Irradiation ◽  
Solution Polymerization ◽  
Temperature Resistance ◽  
Oxidized Starch ◽  
Aqueous Solution Polymerization ◽  
Particle Pollution ◽  
Scanning Electron

The aqueous solution polymerization of acrylic acid, acryl amide and oxidized starch under microwave irradiation was studied, and a polymer dust suppressants was synthesized. It just needs 2 mins to preparation it. The polymer dust suppressants were characterized by IR and scanning electron microscopy (SEM). Prepared several coal models by polymer dust suppressants solution (2.0 g/L) was mixed with coal, and to determine compressive strength, temperature resistance, wind corrosion resistance and water corrosion resistance. The result showed that the polymer dust suppressant can effectively reduce the coal loss and particle pollution in transportation.

Microwave-Irradiated Preparation of Super Absorbent Resin by Graft Copolymerization of Starch and Acrylic Acid

2011 ◽  
Vol 291-294 ◽  
pp. 1335-1338
Author(s):  
Da Biao Zhao
Keyword(s):  
Acrylic Acid ◽  
Microwave Irradiation ◽  
Graft Copolymerization ◽  
Irradiation Time ◽  
Low Cost ◽  
Power Level ◽  
Conventional Heating ◽  
Simple Process ◽  
One Step ◽  
Microwave Power Level

Graft copolymerization of acrylic acid(AA) on starch to prepare super absorbent resin (SAR) under microwave irradiation were investigated using N,N-methylene bis-acrylamide as crosslinker and potassium persulfate as initiator. The influences of the amount of initiator and crosslinker, neutralization degree of acrylic acid(AA), ratio of starch to AA, microwave power level and irradiation time on the distilled water absorption amount of resin were investigated. The results indicated that it only needed 4min under the microwave level of 231W to obtain the resin with the maximum absorption amount of 1110g×g-1, under the conditions that 0.3wt% initiator, 0.02wt% crosslinker, 60% neutralization degree of acrylic acid, the ratio of starch to acrylic acid of 0.25. Under microwave irradiation, the synthesis and drying of super absorbent resin could be completed at one step without nitrogen. Compared to conventional heating method, the methods had the striking advantages of short reaction time, simple process and low cost.

Preparation, Characterization of P(AA-AM)/Organic Montmorillonite Super Absorbent Resin under Focused Signal-Mode Microwave Irradiation

2013 ◽  
Vol 746 ◽  
pp. 142-146
Author(s):  
Shui Li Lai ◽  
Ying Hua Gao
Keyword(s):  
Microwave Irradiation ◽  
Single Mode ◽  
X Ray Diffraction ◽  
Synthesis System ◽  
Organic Montmorillonite ◽  
Modified Montmorillonite ◽  
Aqueous Solution Polymerization ◽  
Signal Mode ◽  
Irradiation Technology

A super absorbent resin (SAR) of acrylic acid (AA)/acrylamide (AM) /organic montmorillonite (OMMT) composite was synthesized by aqueous solution polymerization. This process was carried out under precision microwave organic synthesis system and its single-mode focusing microwave irradiation technology was studied. The montmorillonite (MMT) was modified by treating with cetyltrimethylammonium bromide.The characteristics of the obtained SAR, natural and modified montmorillonite were characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results show that the intercalation is successful, the CTAB as a organic modifier introuduced into lattice layers of montmorillonite by cation-exchange reaction.The SAR have higher liquid absorbency rate.

Semibatch Aqueous-Solution Polymerization of Acrylic Acid: Simultaneous Control of Molar Masses and Reaction Temperature

2011 ◽  
Vol 5 (5-6) ◽  
pp. 223-231 ◽  
Author(s):  
Roque J. Minari ◽  
Gerardo Caceres ◽  
Paola Mandelli ◽  
Mariana M. Yossen ◽  
Manuel Gonzalez-Sierra ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Reaction Temperature ◽  
Solution Polymerization ◽  
Simultaneous Control ◽  
Aqueous Solution Polymerization

Synthesis of Super Absorbent Resin from Starch/Bentonite

2013 ◽  
Vol 873 ◽  
pp. 708-712 ◽  
Author(s):  
Rui Jie Wang ◽  
Lian Wei Yang ◽  
Han Dan Zhang ◽  
Tie Jun Geng
Keyword(s):  
Acrylic Acid ◽  
Absorption Rate ◽  
Pure Water ◽  
Weight Ratio ◽  
Cross Linking ◽  
Key Factors ◽  
Reaction Conditions ◽  
Factors Affecting ◽  
Optimal Reaction ◽  
Radiation Time

The compound super absorbent resin was synthesized by starch, bentonite, acrylic acid and acrylamide, using microwave irradiation. Some key factors affecting the solution absorbency of the polymer such as the amount of bentonite, acrylamide, initiator and cross-linking agent have been discussed. The results showed that the optimal reaction conditions of cross-linking agent, initiator, neutralization degree, bentonite, phosphate starch are 0.045%, 0.32%, 70%, 10%, 3% when the weight ratio of acrylic acid and acrylamide was 2:1, the microwave power was 800W, the radiation time was 15min. Under the conditions, the pure water absorption rate of super absorbent resin was up to 796g/g. when the weight ratio of acrylic acid and acrylamide was 1:1, the absorption rate of 0.9% NaCl was 95g/g.

Glutaraldehyde-Cross-Linked Poly(acrylic acid-co-acrylamide)/Poly(vinyl alcohol) Superabsorbent Membranes

2014 ◽  
Vol 789 ◽  
pp. 194-200
Author(s):  
Man Yi Wang ◽  
Yan Ping Wang ◽  
Yan Ting Yu ◽  
Yi Min Wang ◽  
Jian Hua Ni
Keyword(s):  
Heat Treatment ◽  
Aqueous Solution ◽  
Acrylic Acid ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Water Absorbency ◽  
Solution Polymerization ◽  
Treatment Conditions ◽  
Aqueous Solution Polymerization ◽  
Cross Linker

The superabsorbent membranes were prepared with acrylic acid (AA) and acrylamide (AM) as the monomers, poly (vinyl alcohol) (PVA) as toughening components, potassium persulfate (KPS) as the initiator agent, and glutaraldehyde (GA) as cross-linker by means of aqueous solution polymerization. Their structures were analyzed by FTIR spectroscopy. The effects of synthesis and heat-treatment conditions on water absorbency of superabsorbent membranes were investigated. Their water absorbency with different pH was studied as well. The results showed that the superabsorbent membranes exhibited intelligently pH-responsiveness.

scholarly journals Optimization of Vacuum Microwave-Mediated Extraction of Syringoside and Oleuropein from Twigs of Syringa oblata

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Xiangping Liu ◽  
Xuemin Jing ◽  
Guoliang Li
Keyword(s):  
Microwave Irradiation ◽  
Volume Fraction ◽  
Irradiation Time ◽  
Suitable Method ◽  
Optimal Parameters ◽  
Soaking Time ◽  
Solid Ratio ◽  
Vacuum Microwave ◽  
Irradiation Power ◽  
Conventional Methods

A vacuum microwave-mediated method was used to extract syringoside and oleuropein from Syringa oblata twigs. The optimal extraction conditions were an ethanol volume fraction of 40%, a liquid-solid ratio of 17 mL/g, 1 h of soaking time, −0.08 MPa of vacuum, a microwave irradiation power of 524 W, and a microwave irradiation time of 8 min. Under optimal parameters, the maximum yields of syringoside (5.92 ± 0.24 mg/g) and oleuropein (4.02 ± 0.18 mg/g) were obtained. The proposed method is more efficient than conventional methods for extracting syringoside and oleuropein from Syringa oblata. Moreover, less energy and time were required. The results implied that vacuum microwave-mediated extraction is a suitable method for the extraction of thermosensitive glycosides such as syringoside and oleuropein.

Preparation of Cellulosic Adsorbent for Heavy Metal Ions with Microwave Irradiation

2011 ◽  
Vol 356-360 ◽  
pp. 2246-2249
Author(s):  
Bao Xiu Zhao ◽  
Jie Shu ◽  
Li Na Zheng ◽  
Yuan Wei ◽  
Fan Yang
Keyword(s):  
Heavy Metal ◽  
Acrylic Acid ◽  
Microwave Irradiation ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Sodium Persulfate ◽  
Optimal Conditions ◽  
Irradiation Power ◽  
Irradiation Field ◽  
Grafting Copolymerization

A new kind of cellulosic adsorbent for heavy metal ions was prepared by grafting copolymerization in microwave irradiation field, where acrylic acid (AA) and acrylamide (AM) were used as monomers and carboxymethyl cellulose (CMC) was used as bond. The effects of factors such as microwave irradiation power and time, dosage of initiator (sodium persulfate) and crosslinker (N, N’-methylene bisacrylamide), and neutralization degree on the adsorption for Cu2+were investigated. Experimental results showed that the optimal conditions were as follows: microwave irradiation power and time was 360 W and 3.5 min, respectively; dosage of initiator and crosslinker was 4.1 g/L and 1.9 g/L, respectively, and neutralization degree was 75%.

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