Influence of Spray Drying Conditions on the Properties of Ammonium Dihydrogen Phosphate Fire-Extinguishing Particles

2009 ◽  
Vol 27 (1) ◽  
pp. 77-88 ◽  
Author(s):  
X. H. Fu ◽  
Z. G. Shen ◽  
C. J. Cai ◽  
S. L. Ma ◽  
Y. S. Xing
Keyword(s):  
Spray Drying ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Fire Extinguishing ◽  
Drying Conditions

Superfine Spherical Hollow Ammonium Dihydrogen Phosphate Fire-Extinguishing Particles Prepared by Spray Drying

2009 ◽  
Vol 27 (1) ◽  
pp. 76-83 ◽  
Author(s):  
Xianhui Fu ◽  
Chujiang Cai ◽  
Zhigang Shen ◽  
Shulin Ma ◽  
Yushan Xing
Keyword(s):  
Spray Drying ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Fire Extinguishing ◽  
Spherical Hollow

Development of New Fire Extinguishing Agent for Grassland

2012 ◽  
Vol 550-553 ◽  
pp. 62-70 ◽  
Author(s):  
Ning Bo Leng ◽  
Shun Xi Wang ◽  
Pei Han
Keyword(s):  
Surface Modification ◽  
Calcium Carbonate ◽  
Absorption Rate ◽  
Moisture Absorption ◽  
Water Repellency ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Fire Extinguishing ◽  
Grassland Fire ◽  
Fire Characteristics

Selecting ammonium dihydrogen phosphate of ultra-fine processing and surface modification as the main agent of fire extinguishing agent, mica powder, activated clay, talc, calcium carbonate as an inert filler, ND1 as additive, developed specifically for the grassland fire characteristics of ultra-fine dry powder fire extinguishing agent grassland; tested the moisture absorption rate, water repellency, bulk density and fluidity and other technical indicators; using quadrat grassed ignition method on new grassland fire extinguishing agent research the fire extinguishing efficiency and cost.

scholarly journals Fire extinguishing performance and mechanism for several typical dry water extinguishing agents

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 9827-9836
Author(s):  
Quan Wang ◽  
Fengqi Wang ◽  
Chengxiao Li ◽  
Zhimin Li ◽  
Rui Li
Keyword(s):  
Aqueous Solution ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Temperature Changes ◽  
Fire Extinguishing ◽  
Dry Water ◽  
Performance And Mechanism

Four new dry water fire extinguishing agents (FEAs) were developed by hydrophobic SiO2 and aqueous solution. Among them, dry water FEA with ammonium dihydrogen phosphate has the best extinguishing effect via temperature changes by thermocouples.

The Effect of Phosphatic Composite on Magnesium Phosphate Cement Performance

2014 ◽  
Vol 809-810 ◽  
pp. 477-484
Author(s):  
Zhao Qing Qi ◽  
Hong Tao Wang ◽  
Jun Liang Dang ◽  
Shi Hao Zhang ◽  
Jian Hua Ding
Keyword(s):  
Setting Time ◽  
Potassium Dihydrogen Phosphate ◽  
Magnesium Phosphate ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Hydrogen Phosphate ◽  
Sodium Dihydrogen Phosphate ◽  
Disodium Hydrogen Phosphate ◽  
Potassium Dihydrogen ◽  
Sodium Dihydrogen

The capacity of 10%, 30%, and 50% ammonium dihydrogen phosphate were replaced with an equal amount of three phosphate (potassium dihydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate) respectively. Magnesium phosphate cement was made by phosphate of replaced, which strength, setting time, fluidity, hydration temperature, and the hydration products was researched. The results show that: MPC was made that replaced with the equal amount of three kind of phosphate, which has good mechanical properties. Setting time and fluidity change along with the replacment. Three kind of phosphate replace ammonium dihydrogen phosphate, which change the hydration process of MPC. When ammonium dihydrogen phosphate was replaced by an equal amount of disodium hydrogen phosphate, the temperature of hydration is only 69.4 °C. XRD showed that the diffraction peaks of composite’s magnesium phosphate cement increases.

Growth and Characterization of Ammonium Dihydrogen Phosphate (ADP) Doped with H3BO3 Crystals Grown by Slow Evaporation Method

2016 ◽  
Vol 675-676 ◽  
pp. 573-576 ◽  
Author(s):  
Pratya Thongpanit ◽  
Weerapong Chewpraditkul ◽  
Nakarin Pattanaboonmee
Keyword(s):  
Boric Acid ◽  
Temperature Stability ◽  
Hardness Measurement ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Slow Evaporation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Evaporation Method

Ammonium dihydrogen phosphate (ADP) crystals is very interesting due to its nonlinear optical property. This study investigated on improving of material for academic use by adding boric acid to modify ADP crystals. Slow evaporation method in aqueous solutions of pure ADP and ADP doped with three concentrations of H3BO3 as 0.1, 1.0, 5.0 %wt were studied. The grown crystals were confirmed tetragonal structure by powder X-ray diffraction studies. The FTIR spectrum analysis presented various functional groups of boron in three conditions of doped ADP. TGA study was comfirned the temperature stability at 220 °C for both pure and doped ADP crytals. The machanical stress was analyzed by Vicker’s hardness measurement. The results of this analysis showed boric acid doped 1.0 %wt had superior machanical stress from 10 to 75 grams. ADP doped with boric acid at 1.0 %wt was accepted in all test properties.

Optimising Conditions for Encapsulation of Salacia chinensis Root Extract enriched with Phenolic Compounds

2021 ◽  
Vol 02 ◽  
Author(s):  
Thanh V. Ngo ◽  
Christopher J. Scarlett ◽  
Michael C. Bowyer ◽  
Rebecca McCullum ◽  
Quan V. Vuong
Keyword(s):  
Antioxidant Activity ◽  
Spray Drying ◽  
Feed Rate ◽  
Freeze Drying ◽  
Antioxidant Activities ◽  
Inlet Temperature ◽  
Root Extract ◽  
Optimal Conditions ◽  
Dried Extract ◽  
Drying Conditions

Background: S. chinensis extract contains bioactive compounds, which exhibit high antioxidant activities. However, for commercial uses, it is necessary to encapsulate the extract to protect it from degradation. Objective: This study aimed to optimise spray-drying conditions and then compare with freeze-drying to identify the most suitable conditions for encapsulation of Salacia chinensis L. root extract. Method: Three factors of spray-drying encapsulation, including maltodextrin concentration, inlet temperature and feed rate, have been tested for the impacts on the physical and phytochemical properties of S. chinensis root extract. Based on the optimal conditions, the spray-drying was then compared with freeze-drying. Results: The results showed that maltodextrin concentration, inlet temperature and feed rate had significant impacts on recovery yield, phenolics, mangiferin and antioxidant activity of the spray-dried extract. The optimal spray-drying encapsulation conditions were maltodextrin concentration of 20 %, inlet temperature of 130ºC and feed rate of 9 mL/min. Under these optimal conditions, the encapsulated extract had comparable solubility, total phenolics, mangiferin, and antioxidant activity, lower bulk density, moisture content, and water activity as compared to encapsulated extract made using the freeze-drying technique. These optimal spray-drying conditions are recommended to encapsulate the extract of S. chinensis root. Conclusion: Spray-drying was found to be more effective for encapsulation of S. chinensis root extract than freeze-drying. Therefore, spray-drying is recommended for further applications.

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