Study on Raw Materials Ratio Factor in Synthesis of Ammonium Polyphosphate with Crystalline Form V

2013 ◽  
Vol 641-642 ◽  
pp. 285-288
Author(s):  
Gou Sheng Liu ◽  
Yue Long Liu
Keyword(s):  
Industrial Production ◽  
Raw Materials ◽  
Crystalline Form ◽  
Ammonium Polyphosphate ◽  
Hydrogen Phosphate ◽  
Ammonium Hydrogen ◽  
Ammonium Hydrogen Phosphate ◽  
Controllable Preparation

A non-P2O5 process to prepare ammonium polyphosphate is studied in this paper, the effect of raw materials is investigated. The XRD spectra of synthesized product are studied in detail. Results show that when the ratio of Mono-ammonium hydrogen phosphate to urea is 0.8:1, ammonium polyphosphate form V is the mostly occurrence. The results are informative for controllable preparation of APP in industrial production.

Effect of Ammonia on Preparation of Ammonium Polyphosphate

2011 ◽  
Vol 228-229 ◽  
pp. 828-831
Author(s):  
Gou Sheng Liu ◽  
Xian Zhi Duan
Keyword(s):  
Industrial Production ◽  
Crystalline Form ◽  
Ammonium Polyphosphate ◽  
Hydrogen Phosphate ◽  
Diammonium Hydrogen Phosphate ◽  
Ammonia Atmosphere ◽  
Xrd Techniques ◽  
Controllable Preparation ◽  
Diammonium Hydrogen

Ammonium polyphosphate (APP) was prepared by process of diammonium hydrogen phosphate at different ammonia atmosphere. XRD techniques were used to characterize the crystalline form of this product. Results showed that ammonium had significant effect on the crystalline form of prepared ammonium polyphosphate. The results were informative for controllable preparation ammonium polyphosphate in industrial production.

Effect of Temperature on Preparation of Ammonium Polyphosphate

2013 ◽  
Vol 634-638 ◽  
pp. 2166-2169
Author(s):  
Gou Sheng Liu ◽  
Wen Yan Chen ◽  
Yue Long Liu
Keyword(s):  
Industrial Production ◽  
Crystalline Form ◽  
Ammonium Polyphosphate ◽  
Effect Of Temperature ◽  
Hydrogen Phosphate ◽  
Diammonium Hydrogen Phosphate ◽  
Crystalline Forms ◽  
Controllable Preparation ◽  
Diammonium Hydrogen

Ammonium polyphosphate (APP) with crystalline form II is usually synthesized in temperature 280-3100C, APP with crystalline form V is usually synthesized in temperature 340-3500C. By process of diammonium hydrogen phosphate, the effect of temperature on crystalline forms of APP was studied and discussed in detail. The results were informative for controllable preparation of APP in industrial production.

Selection of Dehydration Temperature to Prepare Ammonium Polyphosphate with Crystalline Form V by Phosphoric Acid Process

2013 ◽  
Vol 668 ◽  
pp. 203-206
Author(s):  
Gou Sheng Liu ◽  
Yue Long Liu
Keyword(s):  
Phosphoric Acid ◽  
Industrial Production ◽  
Crystalline Form ◽  
Ammonium Polyphosphate ◽  
Synthesis Process ◽  
Ammonia Atmosphere ◽  
Acid Process ◽  
Xrd Patterns ◽  
Controllable Preparation ◽  
Selection Of

Ammonium polyphosphate form V (APP-V) is prepared by melting phosphoric acid and melamine in ammonia atmosphere. The effect of dehydration temperature is studied by detailed investigation of the XRD patterns during the synthesis process. Results show that temperature higher than 3000C is suitable for preparation of APP-V. However, some impure other crystals are still coexisted in the synthesized product. The results are informative for controllable preparation of APP in industrial production

Preparation of Ammonium Polyphosphate by Melamine as Sole Condensing Agent

2013 ◽  
Vol 275-277 ◽  
pp. 1710-1713
Author(s):  
Yue Long Liu ◽  
Wen Yan Chen ◽  
Gou Sheng Liu
Keyword(s):  
Industrial Production ◽  
Ammonium Polyphosphate ◽  
Hydrogen Phosphate ◽  
Diammonium Hydrogen Phosphate ◽  
New Process ◽  
Ammonia Atmosphere ◽  
Xrd Patterns ◽  
Controllable Preparation ◽  
Diammonium Hydrogen

Ammonium polyphosphate (APP) is usually synthesized by heating diammonium hydrogen phosphate and phosphorus pentaoxide at ammonia atmosphere, in which phosphorus pentaoxide is used as condensing agent. In this paper, a new process is pointed out in which APP is synthesized by heating diammonium hydrogen phosphate and melamine to a certain temperature at ammonia atmosphere, melamine is used as the sole condensing agent, the XRD patterns of synthesized product are investigated and discussed in detail. The results are informative for controllable preparation of APP in industrial production.

Di-ammonium hydrogen phosphate for the consolidation of lime-based historic mortars – Preliminary research

2021 ◽  
Vol 48 ◽  
pp. 45-53
Author(s):  
Agnieszka Defus ◽  
Elena Possenti ◽  
Antonio Sansonetti ◽  
Cristina Tedeschi ◽  
Chiara Colombo ◽  
...  
Keyword(s):  
Hydrogen Phosphate ◽  
Ammonium Hydrogen ◽  
Historic Mortars ◽  
Ammonium Hydrogen Phosphate ◽  
Preliminary Research

Effects of pH on the Transformation of Gypsum to Carbonate Apatite in the Presence of Ammonium Hydrogen Phosphate

2006 ◽  
Vol 309-311 ◽  
pp. 199-202 ◽  
Author(s):  
Ishikawa Kunio ◽  
Yumiko Suzuki ◽  
Shigeki Matsuya ◽  
Masaharu Nakagawa ◽  
Kiyoshi Koyano
Keyword(s):  
The Other ◽  
Dicalcium Phosphate ◽  
Carbonate Apatite ◽  
Compositional Change ◽  
Hydrogen Phosphate ◽  
Detailed Mechanism ◽  
Effects Of Ph ◽  
Ammonium Hydrogen ◽  
Ammonium Hydrogen Phosphate ◽  
Ph Dependent

Effects of pH on the transformation of gypsum to apatite in the presence of ammonium hydrogen phosphate was studied using NH4H2PO4, (NH4)2HPO4 and (NH4)3PO4. When set gypsum was immersed to ammonium hydrogen phosphate, pH of the solution decreased regardless of the solution. Although pH of the solution decreased, no significant compositional change was observed when gypsum was immersed in NH4H2PO4. On the other hand, apatite and small amount of dicalcium phosphate anhydrous (CaHPO4) was formed when gypsum was immersed in (NH4)2HPO4 solution. Only apatite was formed when gypsum was immersed in (NH4)3PO4 solution. Although the detailed mechanism for the pH dependent products has not been clarified, one of the causes may be the different thermodynamical difference between gypsum and apatite. We would like to recommend the use of (NH4)3PO4 solution since this provides higher pH and thus larger thermodynamical difference between apatite and gypsum and resulting pure apatite block.

Detection of the Intermediate in Preparation of Ammonium Polyphosphate by Temperature Factor

2013 ◽  
Vol 641-642 ◽  
pp. 193-196
Author(s):  
Gou Sheng Liu ◽  
Yue Long Liu
Keyword(s):  
Industrial Production ◽  
Temperature Factor ◽  
Ammonium Polyphosphate ◽  
Effect Of Temperature ◽  
Preparation Process ◽  
Crystalline Forms ◽  
Controllable Preparation ◽  
Long Chain

Ammonium polyphosphate (APP) is a long chain polyphosphate salt, it has six crystalline forms. In preparation of APP, temperature is significant to controllably obtain a certain crystalline forms. In this paper, the effect of temperature is investigated during the preparation process of APP. Some intermediates are detected, the XRD spectra of these intermediates are discussed. The results show that temperature at 2800C is suitable for preparation of form II. With temperature increasing, water insolubility increases. The results are informative for controllable preparation of APP in industrial production.

Detection of the Intermediates in Preparation of Ammonium Polyphosphate by Temperature Raising Rate Factor

2013 ◽  
Vol 275-277 ◽  
pp. 1654-1657
Author(s):  
Yue Long Liu ◽  
Gou Sheng Liu
Keyword(s):  
Reaction Mechanism ◽  
Industrial Production ◽  
Flame Retardants ◽  
Ammonium Polyphosphate ◽  
Reaction Process ◽  
Halogen Free ◽  
Internal Relationships ◽  
Controllable Preparation

Detection of intermediates is the general way to investigate a reaction mechanism, because the intermediates connect the reactants and the products, the intermediates can reflect some internal relationships between the reactants and the products. By studying the the structures of intermediates, the reaction process and reaction mechanism can thus be understood. Ammonium polyphosphate (APP) is an effective material as halogen-free flame retardants, it has six crystalline forms.In preparation of APP, the factor of temperature raising rate is investigated, some intermediates are detected, the XRD spectra of these intermediates are discussed. The results are informative for controllable preparation of APP in industrial production.

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