摘要:
The present invention relates to a process for the selective adsorption and separation of one or more constituents from a gas stream in a gas chromatograph, wherein the gas stream is contacted with a dehydrated chabazite adsorbent having a residual water content of less than 1.5 wt % and having at least 50% of any exchangeable ion capacity exchanged with a polyvalent metal cation. The process of the present invention both anticipates separation of the constituents due to either a difference in the heats of adsorption of the constituents or a size exclusion effect.
摘要:
Thoroughly dehydrated, certain forms of chabazite have improved utility for purifying bulk gases. Compared to conventional molecular sieves, these chabazites have improved properties for removing low levels of gas contaminants having larger heats of adsorption than the bulk component. Also, the small pore chabazite can remove weakly interacting adsorbates from bulk gases having kinetic diameters which exceed that of the pore opening. This discovery of the intrinsic properties of polyvalent chabazites expands the range of contaminant gases which can be removed from bulk gases economically using standard adsorption processes, e.g. using these adsorbents it is possible to remove trace nitrogen from argon.
摘要:
The invention relates to faujasite-containing compositions in which the original hydrogen or monovalent forms are ion exchanged to their polyvalent form and then thermally activated to promote dehydration and dehydroxylation of the faujasite while maintaining substantially the same zeolite content. The resulting compositions containing faujasites substantially in their dehydrated/dehydroxylated state have been found to have surprisingly high selectivities and capacities for the separation of air into nitrogen and oxygen.
摘要:
This invention relates to an improved process for preparing halogenated metal chelates of beta-dicarbonyl compounds, particularly the tris-brominated acetylacetonates. The process comprises passing elemental halogen through a solution comprising the metal chelate, an inert solvent in which the metal chelate has a solubility of at least 0.5 grams per 100 grams solvent and the halogenated product has a solubility of less than 1 gram per 100 grams solvent and a halogenated Lewis acid at a temperature from about 0.degree.-60.degree. C. thereby forming a halogenated metal chelate precipitate and then recovering the precipitate.
摘要:
A method is disclosed for the kinetic separation of gas mixtures using gas-solid chromatography. More specifically, a method is disclosed for the kinetically driven gas-solid chromatographic separation of NF.sub.3 from CF.sub.4 in significant volumes over a specific class of adsorbents to recover NF.sub.3 at high purities, such as 99.99% NF.sub.3.
摘要:
The present invention relates to a process for the selective adsorption and separation of one or more constituents from a gas stream in a gas chromatograph, wherein the gas stream is contacted with a dehydrated chabazite adsorbent having a residual water content of less than 1.5 wt. % and having at least 50% of any exchangeable ion capacity exchanged with a polyvalent metal cation and wherein the dehydrated chabazite has been reacted with an oxidizing atmosphere either during or following dehydration. The process of the present invention both anticipates separation of the constituents due to either a difference in the heats of adsorption of the constituents or a size exclusion effect.
摘要:
The invention relates to a process for adsorption of nitrogen from nitrogen-containing gases using faujasite-containing compositions in which the original hydrogen or monovalent forms are ion exchanged to their polyvalent form and then dehydrated in such a manner as to result in a preponderence of its polyvalent ions in a dehydrated/dehydroxylated state while maintaining substantially the same zeolite content. The resulting compositions, whose cations contained in the faujasitic portion are substantially in their dehydrated/dehydroxylated state, have been found to have surprisingly high selectivities and capacities for the separation of air into nitrogen and oxygen.
摘要:
The present invention is a composition, a synthesis of the composition and a method of using the composition for selectively adsorptively separating nitrogen from oxygen wherein the composition is a crystalline EMT with a Si/Al ratio less than 2.0 and a lithium cation exchange of at least 80%, preferably including an intergrowth with a crystalline FAU structure, wherein the pure or intergrowth compositions have the chemical formula:(0.2-0.0)M.sub.2/n 0:(0.80-1.0)Li.sub.2 0:X.sub.2 0.sub.3 :(2.0 to
摘要翻译:本发明是一种组合物,该组合物的合成以及使用该组合物选择性地从氧气中分离氮气的方法,其中该组合物是Si / Al比小于2.0的结晶EMT和至少一种锂阳离子交换 80%,优选包括具有结晶FAU结构的共生体,其中纯或共生成分具有化学式:(0.2-0.0)M2 / n0(0.80-1.0)Li20:X203:(2.0至4.0)SiO2其中 M =具有n价的锂以外的金属阳离子,X选自铝,镓和硼,优选铝。
摘要:
The present invention is directed to a process for separating nitrogen from gas mixtures containing nitrogen and less strongly adsorbed components such as oxygen, hydrogen, argon or helium at ambient temperatures or above by use of a magnesium exchanged, sodium A-zeolite in a preferred level of magnesium exchange and an appropriate pressure range for adsorption and desorption of bulk gases which provides improved recovery and reduced bed size factor.
摘要:
Preparation of a polyurethane and/or polyisocyanurate product by the reaction of a composition containing an organic polyisocyanate, an active hydrogen containing compound and water as a blowing agent using an effective amount of a molecular sieve containing sorbed amine catalyst and/or crosslinker.