Abstract:
The present invention relates to a process for the production of an ethylenically unsaturated carboxylic acid or ester, preferably α,ß ethylenically unsaturated carboxylic acids or esters, by the liquid phase reaction of formaldehyde or a suitable source thereof with a non-cyclic carboxylic acid ester in the presence of a basic metal salt.
Abstract:
The present invention provides methods for manufacturing olefins such as ethylene and propylene from lower alkanes, that is, methane, ethane and/or propane, by oxidative dehydrogenation at elevated pressure. The olefins are selectively recovered from unconverted lower alkane feed and reaction byproducts by using a complexation separation, such as an absorption separation that uses aqueous silver nitrate as the complexation agent. Catalysts are used that give high selectivity for oxidative dehydrogenation of lower alkanes to olefins at elevated pressure, such as a nonstoichiometric rare earth oxycarbonate catalyst.
Abstract:
The invention relates to a method for producing linear alpha olefins by means of an isomerising metathetical reaction and ensuing ethenolysis. The method comprises the following steps: i) a C4-C10 olefin fraction is introduced into an isomerising metathesis reaction; ii) the mixture obtained is separated into a) a C2-C3-olefin fraction, b) a fraction containing olefins having the desired carbon count, c) a light fraction containing olefins having a carbon count of C4 or above, but below the carbon count of the desired fraction b) and, d) a heavy fraction containing olefins having a carbon count which is above the carbon count of the desired fraction b); iii) the light fraction c) and optionally the heavy fraction d) are redirected into the isomerising metathesis reaction i); iv) the fraction b) and optionally the fraction d) are introduced into an ethenolysis reaction; and v) the alpha olefin fraction produced in iv) is isolated. Linear C8-C12 alpha olefins can be especially produced using said method.
Abstract:
A method for the dehydrogenation of hydrocarbons to alkenes, such as isoamylene to isoprene, n-pentene to piperylene and n-butane to butadiene at pressures less than atmospheric utilizing a dehydrogenation catalyst are disclosed. The embodiments involve operating the dehydrogenation reactor at a pressure of 1,000 mbar or less.
Abstract:
Disclosed are heterogeneous processes (i) for the hydrogenation of a compound containing at least one unsaturated carbon-carbon bond, and (ii) for the hydro-dehalogenation of a compound containing at least one C-Cl, C-Br or C-l bond. The processes comprise reacting said compound with a hydrogenating agent and a heterogeneous hydrogenation catalyst in the presence of an ionic liquid.
Abstract:
The present invention provides a catalyst for the oxidative dehydrogenation of a lower hydrocarbon to form at least one higher hydrocarbon and/or lower olefin. In one embodiment, the catalyst includes a nonstoichiometric rare earth oxycarbonate of the formula MxCyOz having a disordered and/or defect structure, wherein M is at elast one rare earth element selected from the group consisting of La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm; X = 2; Z = 3 + AY; A is less than about 1.8, and Y is the number of carbom atoms in the oxycarbonate. When used for the oxidative dehydrogenation of a lower hydrocarbon at a pressure above bout 100 psig. the catalyst has a selectivity of at least about 40 percent to at least one higher hydrocarbon and/or lower olefin. Methods for preparing catalysts taught by the invention and processes for using the catalysts for the oxidative dehydrogenation of lower hydrocarbons are also provided.
Abstract translation:本发明提供了用于低级烃的氧化脱氢以形成至少一种较高级烃和/或低级烯烃的催化剂。 在一个实施方案中,催化剂包括具有无序和/或缺陷结构的式MxCyOz的非化学计量稀土氧碳酸盐,其中M为选自La,Pr,Nd,Sm,Eu的弹性一种稀土元素, Gd,Tb,Dy,Ho,Er和Tm; X = 2; Z = 3 + AY; A小于约1.8,Y是碳酸酯中的碳原子数。 当在高于100psig的压力下用于低级烃的氧化脱氢。 催化剂对至少一种较高级烃和/或低级烯烃具有至少约40%的选择性。 还提供了用于制备本发明教导的催化剂的方法和使用该催化剂用于低级烃的氧化脱氢的方法。
Abstract:
The invention relates to a method for reducing the formation of polymers during the side chain alkylation or side chain alkenylation of alkylaromatic compounds by reacting olefins or diolefins in the presence of an alkali metal catalyst; and the ensuing distillation for preparing the alkylated or alkenylated compound. The alkali metal in the catalyst is situated on an inorganic carrier, and the catalyst is mechanically separated from the reaction mixture after the reaction and before distillation.
Abstract:
The catalyst for the dimerization of propylene into methyl-4-pentene-1 comprises potassium (K) and potassium carbonate (K2CO3) and is characterized in that it further contains at least one metal (M) selected amongst manganese, chromium, cadmium, nickel, palladium and titanium. It may also include copper. The method for preparing the catalyst comprises the following steps carried out in the presence of an inert liquid having a high boiling point. In a first step, a suspension of potassium carbonate is obtained in the inert liquid. In a second step, the metal or metals (M), and optionally copper, are introduced in powder form into the highly stirred reaction medium. In a third step, after bringing the reaction medium to a temperature higher than the potassium melting temperature, potassium is introduced under high stirring conditions. In the fourth step, the reaction medium is brought to a temperature comprised between 140 and 180°C during a length of time comprised between 1 and 3 hours, and the reaction medium is then allowed to cool down to room temperature. The process for dimerization of propylene into methyl-4-pentene-1 uses the catalyst disclosed hereabove.
Abstract:
The present invention provides a catalyst comprising a transition metal, an inorganic support, a zeolite, and a layered double hydroxide. Using of the catalyst according to the present invention in an olefin production process exhibits high activity and high selectivity with decreased deactivation rate, therefore longer reaction cycle can be performed and catalyst life is prolonged.