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28683 results about "Molecular sieve" patented technology

A molecular sieve is a material with pores (very small holes) of uniform size. These pore diameters are similar in size to small molecules, and thus large molecules cannot enter or be adsorbed, while smaller molecules can. As a mixture of molecules migrate through the stationary bed of porous, semi-solid substance referred to as a sieve (or matrix), the components of highest molecular weight (which are unable to pass into the molecular pores) leave the bed first, followed by successively smaller molecules. Some molecular sieves are used in chromatography, a separation technique that sorts molecules based on their size. Other molecular sieves are used as desiccants (some examples include activated charcoal and silica gel).

Isoreticular metal-organic frameworks, process for forming the same, and systematic design of pore size and functionality therein, with application for gas storage

The ability to design and construct solid-state materials with pre-determined structures is a grand challenge in chemistry. An inventive strategy based on reticulating metal ions and organic carboxylate links into extended networks has been advanced to a point that has allowed the design of porous structures in which pore size and functionality can be varied systematically. MOF-5, a prototype of a new class of porous materials and one that is constructed from octahedral Zn—O—C clusters and benzene links, was used to demonstrate that its 3-D porous system can be functionalized with the organic groups, —Br, —NH2, —OC3H7, —OC5H11, —H4C2, and —H4C4, and its pore size expanded with the long molecular struts biphenyl, tetrahydropyrene, pyrene, and terphenyl. The ability to direct the formation of the octahedral clusters in the presence of a desired carboxylate link is an essential feature of this strategy, which resulted in the design of an isoreticular (having the same framework topology) series of sixteen well-defined materials whose crystals have open space representing up to 91.1% of the crystal volume, and homogeneous periodic pores that can be incrementally varied from 3.8 to 28.8 angstroms. Unlike the unpredictable nature of zeolite and other molecular sieve syntheses, the deliberate control exercised at the molecular level in the design of these crystals is expected to have tremendous implications on materials properties and future technologies. Indeed, data indicate that members of this series represent the first monocrystalline mesoporous organic / inorganic frameworks, and exhibit the highest capacity for methane storage (155 cm3 / cm3 at 36 atm) and the lowest densities (0.41 to 0.21 g / cm3) attained to date for any crystalline material at room temperature.
Owner:RGT UNIV OF MICHIGAN

Method for preparing aromatic hydrocarbons and propylene simultaneously employing methanol/dimethyl ether

The invention discloses a method for preparing aromatic hydrocarbons and propylene simultaneously employing methanol / dimethyl ether, comprising the following steps: 1) placing raw materials containing methanol or / and dimethyl ether, metals and molecular sieve based catalyst which is modified through silanizing in a first fixed bed reactor to perform catalytic reaction; 2) separating the products obtained in step 1) to obtain propylene, then placing propylene in a second fixed bed reactor with molecular sieve based catalyst which is modified by using metals to react, then performing aromatization on the obtained product in step 1) and obtaining aromatic hydrocarbons; then separating to obtain toluene and sending toluene back to the outlet of the first fixed bed reactor as a raw material. In the method, methanol is converted and prepared to aromatic hydrocarbons while propylene is produced at the same time and the content of paraxylene in aromatic hydrocarbons is high. In the products prepared by the method, the content of propylene can reach above 20%, the content of aromatic hydrocarbons can reach above 58wt% and the content of paraxylene in aromatic hydrocarbons is more than 35wt%.
Owner:CHINA NAT OFFSHORE OIL CORP +2

Hydrogenating and pour point depressing catalyst and its preparing method

The invention discloses a hydro dewaxing catalyst and the preparation method. In the method, compound with hydrogen active component is mixed with aluminum dry gel to prepare adhesive; and then the adhesive is mixed with shape-selective cracked zeolite and is pinched in shape; after drying and roasting, catalyst carrier is yielded; then the catalyst carrier is impregnated in the impregnating solution containing the rest active component and promoter; and after drying and roasting again, the catalyst of the invention is yielded. The invention is capable of taking full advantage of the alumina used as adhesive in the catalyst carrier under low hydrogen active component content conditions to prepare adhesive containing all the molybdenum and tungsten and part of the nickel, thereby keeping a certain amount of nickel oxide in the zeolite. The rest of the active metal component is distributed in the alumina, keeping the zeolite passage unobstructed with good hydro dewaxing effect and effectively improving the hydrogen addition and purification performance of the catalyst. The catalyst is especially suitable for hydro dewaxing of raw material containing wax and with high nitrogen impurity content and suitable for hydrogen addition and purification.
Owner:CHINA PETROLEUM & CHEM CORP +1
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