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506-93-4Relevant academic research and scientific papers
Role of Hydrogen Bonding in Phase Change Materials
Matuszek, Karolina,Vijayaraghavan,Kar, Mega,Macfarlane, Douglas R.
, p. 1285 - 1291 (2020/01/31)
Phase change materials (PCMs), which melt in the temperature range of 100-230 °C, are a promising alternative for the storage of thermal energy. In this range, large amounts of energy available from solar-thermal, or other forms of renewable heat, can be stored and applied to domestic or industrial processes, or to an organic Rankine cycle (ORC) engine to generate electricity. The amount of energy absorbed is related to the latent heat of fusion ( "Hf) and is often connected to the extent of hydrogen bonding in the PCM. Herein, we report fundamental studies, including crystal structure and Hirshfeld surface analysis, of a family of guanidinium organic salts that exhibit high values of "Hf ?, demonstrating that the presence and strength of H-bonds between ions play a key role in this property.
Production process of a guanidine nitrate
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Paragraph 0020; 0021, (2017/03/08)
The invention relates to a production technique of a chemical product, particularly a production technique of guanidine nitrate, which comprises the following steps: mixing raw materials, and carrying out fusion reaction. The weight percent of the guanidine nitrate in the guanidine nitrate finished product is greater than 94%. By using ammonium carbonate instead of ammonia gas in the prior art as an assistant in the production process, the technique has the following advantages:1. the technique is simple and convenient for controlling technological conditions;2. the quality of the product is greatly improved: the maximum purity of the product obtained by the prior art is lower than 92%, but the purity of the product obtained by the technique is high than 94%, which is a qualitative improvement for large-scale production; and 3. the safety in the production process is enhanced: the technique does not need liquid ammonia storage tanks, transmission pipelines and other dangerous facilities in the existing production process, thereby greatly enhancing the safety in the production process.
Synthesis method of 2-amino-4, 6-dihydroxypyrimidine
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Paragraph 0012; 0013; 0014, (2017/03/21)
The invention relates to a synthesis method of 2-amino-4, 6-dihydroxypyrimidine. Guanidine nitrate and diethyl malonate are employed as the raw materials for one-step cyclization reaction. The steps include: employing a new-made sodium ethoxide solution, diethyl malonate and self-made guanidine nitrate to carry out stirring reflux reaction for 0.5-1.5h, distilling off ethanol, then dissolving the obtained white solid in water, then using a 4-6% acetic acid solution to conduct acidification to a pH value of 4-6, and carrying out filtering, washing and drying, thus obtaining a white solid 2-amino-4, 6-dihydroxypyrimidine. The method provided by the invention has the advantages of simple reaction steps, low reaction temperature, safety and environmental protection, is suitable for industrial production, and has wide application prospect.
Two-Dimensional Condensation of Guanidinium Nitrate at the Mercury-Water Interface
Wandlowski, Thomas,Jameson, Geoffrey B.,Levie, Robert de
, p. 10119 - 10126 (2007/10/02)
Guanidinium cations can form a condensed interfacial monolayer with nitrate anions, in which the two ions participate in a one-to-one ratio.The earlier results of Dyatkina et al. (Elektrokhimiya 1980, 16, 996) have been confirmed and extended.The formation of the monolayer film is controlled by the kinetics of nucleation and two-dimensional growth.Most likely, the film is held together by multiple hydrogen bonds between the nitrate oxygens and the amine hydrogens of the guanidinium ions, in an interfacial organization similar to that in the layered crystal structure reported here.
Novel pyrimidopyrimidine derivative, process for producing it and pharmaceutical composition
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, (2008/06/13)
Pyrimidopyrimidine derivatives having the general formula STR1 wherein R1 is an alkyl group; R2 is an alkyl or phenyl group; R3 is a hydrogen atom, an alkyl or lower alkylamino group; and R4 is a hydrogen atom, an alkyl, halogenated lower alkyl, phenyl, amino or lower alkylamino group; and pharmaceutically acceptable salts thereof. These compounds are useful as anti-allergic agents, for example, for the treatment of bronchial asthma, urticaria, allergic rhinitis, allergic dermatoses or allergic conjunctivitis.
Process for the production of guanidine nitrate from a mixture of urea and ammonium nitrate and apparatus for its performance
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, (2008/06/13)
In a process for the production of guanidine nitrate from a mixture of urea and ammonium nitrate in the presence of a catalyst containing silicium oxide at increased temperature, the initial mixture of urea and ammonium nitrate having an excess of ammonium nitrate, urea is added stepwise to the existing mixture of urea and ammonium nitrate and the catalyst during the procedure in quantities so that the weight ratio of urea: ammonium nitrate is permanently in favor of an excess of ammonium nitrate. The weight ratio is practically maintained during the process and is increased only in the final phase. An apparatus for the performance of the process of the invention comprises a reactor system including one or several substantially horizontal, tubular, heatable reactors in a series. The reaction mass is introduced together with the catalyst in the form of a melt and moved through the reactor system by means of a stirrer and a conveyor. At one or several places before the outlet of the reactor system inlet nozzles are provided in certain distances from one to the other through which urea and catalyst may be added to the melt. For a continuous performance for the process the reaction mass is brought onto heatable conveyor belts in a series as a layer of the desired thickness. Along the belt the required additives are added to the reaction mass. The rate of the conveyor belts depends on the reaction rate.