Abstract:
The invention relates to highly active and selective catalysts for alkyne metathesis. In one aspect, the invention includes a multidentate organic ligand wherein one substrate-binding site of the metal center is blocked. In another aspect, the invention includes N-quaternized or silane-based multidentate organic ligands, capable of binding to metals. In yet another aspect, the invention includes N-quaternized or silane-based multidentate catalysts. The catalysts of the invention show high robustness, strong resistance to small alkyne polymerization and significantly enhanced catalytic activity compared to their corresponding non-quaternized or non-silane-based multidentate catalyst analogues.
Abstract:
A reactor in the form of a cylinder or prism wherein the interior of the reactor is divided by a cylindrical or prismatic gastight housing G which is arranged in the longitudinal direction of the reactor into an inner region having one or more catalytically active zones, in which in each case a packing composed of monoliths stacked on top of one another, next to one another and behind one another and before each catalytically active zone in each case a mixing zone having solid internals are provided, and an outer region B arranged coaxially to the inner region A, wherein the inner region A is insulated from the outer region B of the reactor by means of a microporous high-performance insulation material having a thermal conductivity 1 at temperatures up to 700° C. of less than 0.05 W/m*K is proposed.
Abstract translation:反应器为圆筒或棱柱形式,其中反应器的内部被圆柱形或棱镜气密的外壳G分隔开,该外壳G在反应器的纵向被布置成具有一个或多个催化活性区域的内部区域,其中 在每种情况下,由堆叠在彼此顶部,彼此相邻并且彼此相邻并且在每种情况下的每个催化活性区域之间的整体组成的填料提供有具有实心内部的混合区域,以及与该区域同轴设置的外部区域B 内部区域A,其中内部区域A通过具有小于0.05W / m 2的温度高达700℃的导热率1的微孔高性能绝缘材料与反应器的外部区域B绝缘; 提出K。
Abstract:
New tertiary amine salts are useful as gas hydrate inhibitors in oil and gas production and transportation. These tertiary amine salts give very good separation from an emulsion, are economic and have reduced toxicity concerns.
Abstract:
A catalytic process and a nano material for the conversion of moist carbon dioxide into methanol, propyne and oxygen have been developed. In the process invented, hydrogen is produced from water in a catalytic reaction, when the moist carbon dioxide enters into the catalytic reactor, resulting in C—O and H—OH bond breakage at a relatively low temperature and at atmospheric pressure in a single step using a combination of catalytic materials comprising at least three metals dispersed on a catalyst support, preferably anatase form of titanium dioxide, to induce a multifunctional surface chemical reaction for the production of oxygenated products such as hydrocarbons of different chain lengths.
Abstract:
A method of producing substituted acetylenic compounds which comprises: reacting an organic compound having the general formula ofA--X (I)wherein A represents a saturated or unsaturated aliphatic hydrocarbon residue of 1-20 carbon atoms which may have one or more substituents inactive in the reaction, and X represents a halogen atom or an arylsulfonyloxy group, with a metal acetylide having the general formula ofM--C.tbd.C--B (II)wherein M represents an alkali metal, and B represents (a) a hydrogen, (b) a saturated or unsaturated hydrocarbon residue which may have one or more substituents inactive in the reaction, or (c) a saturated or unsaturated hydrocarbon residue which has a substituent having the general formula of--C.tbd.C--M (III)wherein M represents an alkali metal, in the presence of an alkyl-2-imidazolidinone having the general formula of ##STR1## wherein R.sup.1 and R.sup.2 independently represent a lower alkyl, and R.sup.3 represents a hydrogen or a lower alkyl.
Abstract:
1. A PROCESS FOR THE PREPARATION OF 9-TRICOSYNE COMPRISING REACTING AN ACETYLIDE OF AN ACETYLIDE OF THE FORMULA
HC=C-R
WITH A 1-HALOALKANE OF THE FORMULA
HAL-R''
WHEREIN ONE OF R AND R'' IS A STRAIGHT CHAIN ALKYL RADICAL OF 8 CARBON ATOMS AND THE OTHER IS A STRAIGHT CHAIN ALKYL RADICAL OF 13 CARBON ATOMS, AND THE HALOGEN IS BROMINE OR IODINE.
Abstract:
ACETYLENE IS TRANSPORTED SAFELY AND ECONOMICALLY BY CONTACTING AN ACETYLENE-CONTAINING GAS IN A FIRST LOCATION WITH A SOLUTION OF CUPROUS ALUMINUM TETRACHLORIDE IN AN AROMATIC HYDROCARBON OR HALOGENATED AROMATIC HYDROCARBON TO FORM A SOLUTION OF AN ACETYLENE-CUPROUS ALUMINUM TETRACHLORIDE COMPLEX IN THE AROMATIC SOLVENT, TRANSPORTING THE SOLUTION CONTAINING THE ACETYLENE COMPLEX FROM THE FIRST LOCATION TO A SECOND LOCATION, CONTACTING THE SOLUTION IN THE SECOND LOCATION WITH A COUNTERCURRENT STREAM OF A HYDROCARBON VAPOR AT 75* C. TO 180* C., AND RECOVERING SUBSTANTIALLY PURE ACETYLENE FROM THE RESULTING GAS STREAM.
Abstract:
A catalyst for the isomerization of allenes into their corresponding terminal acetylenic isomers is prepared by combining an alkali metal having an atomic weight greater than that of lithium with alumina in the presence of sufficient heat for the free alkali metal to melt and react with the alumina. Passing a stream of an allene compound through a bed of this catalyst converts the allene into the corresponding terminal acetylenic isomer.