摘要:
The method enables control over carbon pore structure to provide sorbents that are particularly advantageous for the adsorption of specific gases. It involves preparation of a sorbent precursor material, carbonization of the precursor material, and, usually, activation of the carbonized material. The resultant material is subjected to heat treatment and/or to surface conditioning by a reducing gas at elevated temperatures.
摘要:
Use of molecular sieves to reduce the amount of trifluoromethane (HFC-23) present in a mixture of HFC-23 with other materials, particularly from mixtures containing HFC-23 and trifluoroiodomethane (CF3I).
摘要:
A gas permeable, carbon based, nanocomposite membrane comprises a nanoporous carbon matrix comprising a pyrolyzed polymer, and a plurality of nanoparticles of carbon or an inorganic compound disposed in the matrix. The matrix is prepared by pyrolyzing a polymer, and nanoparticles of the particulate material are disposed in the polymer prior to pyrolysis. The particles may be disposed in a precursor of the polymer, which precursor is subsequently polymerized, or in the polymer itself.
摘要:
Filters and smoking articles include at least one carbon fiber composite molecular sieve sorbent capable of selectively removing one or more selected constituents from mainstream smoke. Methods for making cigarette filters and smoking articles using the carbon fiber composite molecular sieve sorbent and methods for treating mainstream tobacco smoke in a cigarette comprising the carbon fiber composite molecular sieve sorbent are also provided.
摘要:
An adsorbent for separating nitrogen from a mixed gas of oxygen and nitrogen is MSC wherein an oxygen and nitrogen separation ratio α and a ratio (t95/t50) of a time t50 required for adsorbing 50% of the oxygen equilibrium adsorption amount and a time t95 required for adsorbing 95% of the oxygen equilibrium adsorption amount satisfy the inequality (t95/t50)
摘要:
The disclosed invention relates to a process for separating methane or nitrogen from a fluid mixture comprising methane and nitrogen, the process comprising: (A) flowing the fluid mixture into a microchannel separator, the microchannel separator comprising a plurality of process microchannels containing a sorption medium, the fluid mixture being maintained in the microchannel separator until at least part of the methane or nitrogen is sorbed by the sorption medium, and removing non-sorbed parts of the fluid mixture from the microchannel separator; and (B) desorbing the methane or nitrogen from the sorption medium and removing the desorbed methane or nitrogen from the microchannel separator. The process is suitable for upgrading methane from coal mines, landfills, and other sub-quality sources.
摘要:
CMS adsorbents having suitable indexes are used to improve greatly the performance of nitrogen-producing apparatuses where nitrogen is obtained from the air with a PSA method, so as to improve the efficiency of nitrogen production. A nitrogen PSA apparatus is formed with two adsorbing columns where an adsorption step and a regeneration step are performed alternatively and periodically. The adsorption step is for adsorbing oxygen and conducting nitrogen to a product tank with the supply of compressed air from an air compressor, and the regeneration step for releasing the adsorbed gas after the adsorption step. The adsorbing columns are filled with a carbon molecular sieve (CMS) that selectively adsorbs oxygen as an adsorbent. The CMS adsorbs an oxygen/nitrogen amount of 50% of the saturated adsorption amount with a period TO/TN starting from oxygen/nitrogen supply, wherein TO is 5˜10 seconds and TN is larger than TO by more than 41 times.
摘要:
A channelized sorbent material comprises porous sorbent particles characterized by an average pore diameter. Each sorbent particle has at least one interior channel of an average transverse dimension (i.e. transverse diameter) that is at least ten times larger than the average pore diameter of the porous sorbent particle. The interior channel may constitute a single cylindrical through-bore in the sorbent particle, or alternatively, an array of intersecting or non-intersecting channels. The porous sorbent particles preferably comprise bead activated carbon particles. Such channelized sorbent material is particular useful as sorbent media in an adsorption-desorption apparatus for storage and dispensing of a sorbable fluid.
摘要:
In a method for storing hydrogen in a carbon material containing microstructures in the form of cones with cone angles being multiples of 60°, the carbon material is introduced in a reaction vessel which is evacuated while the carbon material is kept at a temperature of 295-800 K, after which pure hydrogen gas is introduced in the reaction vessel, the carbon material being exposed to a hydrogen gas pressure in the range of 300-7600 torr such that the hydrogen gas is absorbed in the carbon material, and after which the reaction vessel is left at the ambient temperature with the carbon material under a fixed hydrogen gas pressure. For use the hydrogen is released in the form of a gas from the carbon material either at ambient temperature or by heating the carbon material in the reaction vessel. In a method for refining a carbon material of this kind for hydrogen storage, the carbon material is produced in a reaction chamber with the use of a catalyst for adjusting the cone angle distribution of the microstructures. Use for storing of hydrogen as fuel for powering transport means, including vehicles.
摘要:
A process is provided for making a modified carbon molecular sieve which is suitable for separating gases having different adsorption rates on the sieve. The process involves modifying a starting sieve support having a majority of micropores with an effective pore size of about 4.5 to 20 angstroms, with a two-step process in which the sieve is contacted with two different concentrations of a volatile carbon-containing organic compound, preferably a hydrocarbon. The concentration of the carbon-containing compound used in the first step is larger than that in the second step, so that the pore openings of the micropores of the support are narrowed successively in two distinct steps without filling the micropores themselves. The invention also discloses an improved carbon molecular sieve and the separation of gases, such as oxygen from nitrogen, by the use of this improved adsorbent.