A disappearing metastable hydrate form of L-citrulline: Variable conformations in polymorphs and hydrates

2020 ◽  
Vol 1201 ◽  
pp. 127179
Author(s):  
Palash Sanphui ◽  
Renjith S. Pillai
Keyword(s):  
Hydrate Form

Process Analysis of Hydrogen Storage in the Hydrate Form by Utilization of Liquefied Natural Gas Cold Energy

2012 ◽  
Vol 433-440 ◽  
pp. 215-220 ◽  
Author(s):  
Hong Jun Yang ◽  
Shuan Shi Fan ◽  
Xue Mei Lang ◽  
Yan Hong Wang
Keyword(s):  
Natural Gas ◽  
Hydrogen Storage ◽  
Process Analysis ◽  
Liquefied Natural Gas ◽  
Storage Process ◽  
Adsorption Method ◽  
Hydrate Form ◽  
Cold Energy ◽  
Pressure Swing ◽  
Ice Powder

A process of hydrogen storage in the form of hydrate by utilization of liquefied natural gas(LNG) cold energy was proposed. Hydrogen was recovered from exhaust gas by pressure swing adsorption method, and formed gas hydrate with ice powder under a pressure of 35 MPa and a temperature of 140 K. The process analysis was carried out with partially numerical simulation by Aspen Plus and theoretical calculation. The results show that the energy consumption of hydrogen stored in the hydrate form is 12058 kJ/(kg.H2) and of this hydrogen storage process, the ratio of spent energy to stored energy is 0.10 , which is superior to the most of the other method. The research indicated that if there is cold energy with low temperature available, hydrogen stored in the hydrate form is a method of feasible and energy-efficient.

Can hydrate form in carbon dioxide from dissolved water?

2013 ◽  
Vol 15 (6) ◽  
pp. 2063-2074 ◽  
Author(s):  
Bjørn Kvamme ◽  
Tatiana Kuznetsova ◽  
Pilvi-Helina Kivelæ ◽  
Jordan Bauman
Keyword(s):  
Carbon Dioxide ◽  
Hydrate Form

Measurement of Latent Heat of Tetra-n-Butyl Ammonium Bromide Hydrate and Specific Enthalpy of Its Slurry

2015 ◽  
Vol 23 (03) ◽  
pp. 1550025 ◽  
Author(s):  
Hiroyuki Kumano ◽  
Tatsunori Asaoka ◽  
Tatsuya Hayashi ◽  
Peng Zhang
Keyword(s):  
Aqueous Solution ◽  
Phase Equilibrium ◽  
Specific Heat ◽  
Latent Heat ◽  
Specific Enthalpy ◽  
Ammonium Bromide ◽  
Equilibrium Conditions ◽  
Hydrate Form ◽  
Latent Heats ◽  
Storage Characteristics

The specific heat of a tetra-n-butyl ammonium bromide (TBAB) aqueous solution, the latent heat of a TBAB hydrate, and the specific enthalpy of a TBAB hydrate slurry were measured to understand the thermal storage characteristics of TBAB hydrate slurry. A solution sample and the hydrate slurry were heated, the change in temperature was measured, and the specific heat of the TBAB aqueous solution and the specific enthalpy of the hydrate slurry were obtained from the change in temperature. Two types of TBAB hydrate form. Therefore, the hydrates were separated from the hydrate slurry formed from TBAB aqueous solution having several initial concentrations. The hydrate crystals were placed into solution, and the latent heats were obtained from the temperature change of the solution. The specific enthalpy of the hydrate slurry was estimated from the latent heats of the hydrate crystals and the specific heat of the solution under phase equilibrium conditions, and the measured and estimated values were compared.

Technological Solutions for the Realization of NGH-Technology for Gas Transportation and Storage in Gas Hydrate Form

2018 ◽  
Vol 277 ◽  
pp. 123-136 ◽  
Author(s):  
Mykhailo Pedchenko ◽  
Larysa Pedchenko ◽  
Tetiana Nesterenko ◽  
Artur Dyczko
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Atmospheric Pressure ◽  
High Stability ◽  
Hydrated Form ◽  
Hydrate Form ◽  
Capital Costs ◽  
Large Size ◽  
Long Time ◽  
And Storage

The technology of transportation and storage of gas in a gas-hydrated form under atmospheric pressure and slight cooling – the maximum cooled gas-hydrated blocks of a large size covered with a layer of ice are offered. Large blocks form from pre-cooled mixture of crushed and the granulated mass of gas hydrate. The technology of forced preservation gas hydrates with ice layer under atmospheric pressure has developed to increase it stability. The dependence in dimensionless magnitudes, which describes the correlation-regressive relationship between the temperature of the surface and the center gas hydrate block under its forced preservation, had proposed to facilitate the use of research results. Technology preservation of gas hydrate blocks with the ice layer under atmospheric pressure (at the expense of the gas hydrates energy) has designed to improve their stability. Gas hydrated blocks, thus formed, can are stored and transported during a long time in converted vehicles without further cooling. The high stability of gas hydrate blocks allows to distributed in time (and geographically) the most energy expenditure operations – production and dissociation of gas hydrate. The proposed technical and technological solutions significantly reduce the level of energy and capital costs and, as a result, increase the competitiveness of the stages NGH technology (production, transportation, storage, regasification).

Insight into a direct solid–solid transformation: a potential approach for the removal of residual solvents

CrystEngComm ◽  
2016 ◽  
Vol 18 (10) ◽  
pp. 1699-1704 ◽  
Author(s):  
Pengpeng Yang ◽  
Chenguang Lin ◽  
Wei Zhuang ◽  
Qingshi Wen ◽  
Fengxia Zou ◽  
...  
Keyword(s):  
Residual Solvents ◽  
Hydrate Form ◽  
Potential Approach ◽  
Direct Solid ◽  
Insight Into

A simple humidity process allows a direct solid–solid transformation from the solvate (methanol trihydrate of cAMPNa) to its hydrate form (pentahydrate).

scholarly journals Enrichment of gas storage in clathrate hydrates by optimizing the molar liquid water–gas ratio

RSC Advances ◽  
2022 ◽  
Vol 12 (4) ◽  
pp. 2074-2082
Author(s):  
Sai Kiran Burla ◽  
S. R. Prasad Pinnelli
Keyword(s):  
Carbon Dioxide ◽  
Liquid Water ◽  
Gas Storage ◽  
Clathrate Hydrates ◽  
Carbon Dioxide Storage ◽  
Hydrate Form ◽  
Water Gas ◽  
Gas Ratio

Methane and carbon dioxide storage in hydrate form.

Study on Reuse of Dry Water to Store Methane in a Hydrate Form

2012 ◽  
Vol 518-523 ◽  
pp. 3200-3203
Author(s):  
Gao Wei Hu ◽  
Yu Guang Ye ◽  
Cheng Feng Li ◽  
Chang Ling Liu ◽  
Qing Guo Meng
Keyword(s):  
Storage Capacity ◽  
Hydrate Formation ◽  
Free Water ◽  
Gas Storage ◽  
Methane Hydrates ◽  
Hydrated Form ◽  
Hydrate Form ◽  
Pressure Cell ◽  
Hydrophobic Silica ◽  
Dry Water

Dry water (DW) is a powder composed of hydrophobic silica surrounding tiny water droplets. It’s recently demonstrated to be an effective medium for storage methane in a hydrated form. But the recyclability of DW is not so clear at present. Here we used a dedicated pressure cell to form four dry water methane hydrates samples (DW-MH), corresponding to four cycle-types of hydrate formation and dissociation, to investigate the reuse of dry water. The results show that part of water escape from DW and become “free water” after DW-MH is dissociated. The free water is hard to form hydrate during the next cycle of hydrate formation. As a result, the gas storage capacity of DW-MH decreases dramatically as the using times of DW increases.

Pharmacutico Analytical Study of Mukta Shukti Bhasma

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Biradar M. H. ◽  
Shankar Gowda ◽  
Madhav Diggavi
Keyword(s):  
General Practice ◽  
Calcium Oxide ◽  
Analytical Study ◽  
Systematic Observation ◽  
Hydrate Form ◽  
Oxide Hydrate ◽  
Study Materials ◽  
Three Samples ◽  
Pharmaceutical Processing ◽  
Pharmaceutical Processes

Background: Mukta Shukti is an aquamarine calcium carbonate compound. Mukta Shukti Bhasma is a classical ethical economical medicament, effective in general practice, pharmaceutical processing as per texts with systematic observation and technological updating is carried out in the present work. Objectives: To prepare Mukta Shukti Bhasma by different Pharmaceutical processes and carry out the analytical study. Materials and Methods: Grahya Ashodhita Mukta Shukti was subjected to Shodhana by Kanji Swedana for 3 hours and then divided into two parts. The first part of Shodhita Mukata Shukti was incinerated totally and after 1st Puta it was divided into two portions, first portion was subjected to Jala Bhavana and incinerated. The second portion was subjected to Kumari Swarasa Bhavana and incinerated. The second part of Shodhita Mukata Shukti was incinerated in Kumari Samputa and subjected to Kumari Swarasa Bhavana and incinerated until they attain Bhasma Siddhi Lakshanas and later all the three samples were subjected to analytical studies. Results: Mukta Shukti Bhasma by Jala Bhavana method, Kumari Bhavana method, and Kumari Samputa method requires 7, 6 and 3 Gajaputas respectively with an average of 324 cow dungs in each and at 793°C temperature. Conclusion: Kumari Bhavita Marana to Mukta Shukti leads to calcite form and Jala Bhavita Marana leads to calcium oxide hydrate form. Chemically Mukta Shukti Bhasma may be in both calcite and calcium oxide hydrate form, and XRD is a method in Standardization of Mukta Shukti Bhasma.

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