40 results about "Acetylenic Compounds" patented technology

A method for producing a catalyst, in particular for the selective reduction of acetylenic compounds in hydrocarbon streams. An impregnation solution is provided, which contains a mixture of water and at least one water-miscible organic solvent as solvent in which at least one active metal compound and also preferably at least one promoter metal compound is dissolved. A support is provided, the support is impregnated with the impregnation solution, and the impregnated support is calcined. Palladium is preferably used as active metal and silver is preferably used as promoter metal. Also, a catalyst as is obtained by the method and also its preferred use for the selective hydrogenation of acetylenic compounds.

Heat-curable silicone compositions employing a reactive silicone, a silicone hydride crosslinker and a catalyst system which includes a rhodium-based catalyst, a stabilizing system are disclosed. A combination of rhodium and platinum-based catalysts are employed as well. The compositions are low temperature curing and are capable of providing low coefficient of thermal expansion compositions. A stabilizer system which includes in combination a peroxide and an acetylenic compound is also disclosed.

The invention provides a liquid organosilicon lubricating grease composition, which is cast between a heating element and a heat radiation element and then solidified, thereby improving thermometric conductivity and simultaneously maintaining allocation performance of organosilicon lubricating grease composition with heat conductivity. The organosilicon lubricating grease composition with heat conductivity contains the following substances: 25 DEG C, viscosity 50-1000 Pa.s: (A) organopolysiloxane containing more than two alkenyl groups in one molecule; (B) organic hydrogen polysiloxane showed in general formula (1); (C) organic hydrogen polysiloxane showed in general formula (2); (D) bulking agent with heat conductivity, whose thermometric conductivity is more than 10W/m DEG C; (E) catalyst selected from platinum and platinum compound; (F) control agent selected from acetylenic compound, nitrogen compound, organic phosphorus compound, oxime compound and organic chloride compound; (G) volatile solvent for dispersing or dissolving ingredients mentioned above and the boiling point is 80-360 DEG C.

The invention provides an addition type solidifiable polysiloxane composition which is prepared from the following components of (A) organopolysiloxane with two or a plurality of alkenyls, (B) organic hydrogenated polysiloxane, (C) a platinum group metal catalyst and (D) an alkoxy silanization acetylenic compound. Each molecule of the organic hydrogenated polysiloxane comprises more than two silicon elements bonded with hydrogen atoms. The composition can be stored for a long time in a room temperature. In high-temperature solidification, the surface and the inside of the composition can be evenly solidified, and a cured product is smooth in surface and free of wrinkle. The addition type solidifiable polysiloxane composition can be widely applied to the fields of a pouring material, a coating material and addition type silicone rubber of an electronic device and liquid injection moulding silicone rubber.

Novel catalysts capable of rendering both polar and non-polar organic fuels hypergolic with rocket-grade hydrogen peroxide are disclosed. These catalysts are complexes formed by reacting alkyl-substituted diamines or triamines, with metal salts of an aliphatic carboxylic acid or metal 1,3 dione chelates. In addition, the use of various acetylenic compounds as stability enhancing additives and/or promoters is described.

More selective and efficient Ni hydrotreating catalysts are those which contain more than about 60% of the Ni content on the peripheral surface of porous supports, such as extruded alumina, which may be obtained by spraying an atomized solution of a Ni compound onto the support and drying it at a temperature in the range of from 200 to 600 DEG C. When used, for example, to remove acetylenic compounds from butadiene streams, higher recovery of the desired butadiene with lower acetylenic content and low heavy polymer deposition is obtained than was possible with prior catalysts.

An inkjet ink includes: an ink vehicle; a colorant; and an acetylenic compound having an alkoxylated hydroxyl group, wherein the hydroxyl group is a primary or secondary hydroxyl group and the acetylenic compound is absent a lipophilic group. Printheads having resistive heater elements exposed to such inks have prolonged lifetimes compared to reference inks.

A process for removal of acetylenic compounds from hydrocarbon streams in which a hydrocarbon feed having a target fraction which contains a first concentration of acetylenic compounds and olefins is contacted with a catalyst selective for the hydrogenation of acetylenic compounds in the presence of hydrogen and a solvent having a boiling point higher than the boiling point of the target fraction in a distillation reaction zone under conditions of temperature, pressure and hydrogen concentration favoring the hydrogenation of acetylenic compounds in which the target fraction is recovered as overheads having a second concentration of acetylenic compounds lower than said first concentration and the solvent is recovered as bottoms.

Synthetic methods for the in-situ formation of olefin metathesis catalysts are disclosed, as well as the use of such catalysts in metathesis reactions of olefins and olefin compounds. In one aspect, a method is provided for synthesizing an organometallic compound of the formula

comprising contacting a precursor compound of the formula (X¹X²ML_jL¹_kL³_m)_i with an acetylenic compound comprising a chelating moiety, optionally, in the presence of a neutral electron donor, wherein M is a Group 8 transition metal, L, L¹, L², and L³ are neutral electron donors, X¹ and X² are anionic ligands, j is 1, 2, or 3; k is zero, 1, or 2; m is zero or 1; n is 1 or 2; and i is an integer; with the proviso that k is zero when the precursor compound is contacted with the acetylenic compound in the presence of the neutral electron donor, and R¹ and R² are independently selected from hydrocarbyl, substituted hydrocarbyl, heteroatom-containing hydrocarbyl, substituted heteroatom-containing hydrocarbyl, and functional groups, wherein R¹ and R² are linked and together form one or more cyclic groups, R² and L² are linked and together form one or more cyclic groups, and any other two or more of X¹, X², L¹, L², L³, R¹, and R² can be taken together to form one or more cyclic groups. The invention has utility in the fields of catalysis, organic synthesis, polymer chemistry, and industrial and fine chemicals chemistry.

Copper sorbents which are resistant to the reduction by hydrogen are used as a guard bed for an acetylene conversion zone. The adsorbents include cuprous oxide, cupric oxide, copper metal, and a halide and are pre-reduced prior to be loaded into the guard bed. The sorbents can remove contaminants that would poison selective hydrogenation catalysts used for a selectively hydrogenating acetylenic compounds in an olefin stream. The sorbents may also selectively hydrogenate the acetylenic compounds.

The present invention relates to a method of purifying olefin, the method comprising removing a small amount of acetylenic compounds contained in olefin by using pyrrolidinium-based or piperidinium-based ionic liquid mixtures comprising copper (I) halide. According to the method of the present invention, copper (I) halide is stabilized by pyrrolidinium-based or piperidinium-based ionic liquids, suppressing the oxidation of Cu(I) into Cu(II), whereby the capacity of removing acetylenic compounds can be maintained for a long time and the selective removal rate of acetylenic compounds to olefin can be significantly improved. In addition, since the ionic liquid mixtures comprising copper (I) halide used in the method of the present invention can be applied to both absorption and extraction processes, it can effectively remove acetylenic compounds from olefin in a more simple and economical way compared to the existing adsorption and membrane separation processes.

Methods for the selective hydrogenation of acetylenic compounds in a product stream that includes isoprene. A method of selectively hydrogenating an acetylenic hydrocarbon in the presence of isoprene may include obtaining a hydrocarbon mixture comprising an acetylenic hydrocarbon, isoprene, and butadiene or cyclopentadiene, or both. If cyclopentadiene is present, the hydrocarbon mixture may comprise greater than 2 wt. % cyclopentadiene. The method may further include contacting the hydrocarbon mixture and hydrogen (H₂) with a hydrogenation catalyst under reaction conditions that are more selective to the hydrogenation of the acetylenic hydrocarbon than the isoprene.