摘要:
The present invention (in a first embodiment) relates to a process for the simu ltaneou s dehyd ration and skeletal isomerisation of isobuta nol to ma ke substantially corresponding olefins, having the same number of carbons and consisting essentially of a mixture of n-butenes and iso-butene, said process comprising: a) introducing in a reactor a stream (A) comprising isobutanol, optionally water, optionally an inert component, b) contacting said stream with a catalyst in said reactor at conditions effective to dehydrate and skeletal isomerise at least a portion of the isobutanol to make a mixture of n-butenes and iso-butene, c) recovering from said reactor a stream (B), removing water, the inert component if any and unconverted isobutanol if any to get a mixture of n-butenes and iso-butene, Wherein, the WHSV of the isobutanol is at least 1 h -1 or the temperature is from 200°C to 600°C and the catalyst is capable to make simultaneously the dehydration and skeletal isomerization of butene. The catalyst is a crystalline silicate of the group FER, MWW, EUO, MFS, ZSM-48, MTT, MFI, MEL or TON having Si/AI higher than 10, or a dealuminated crystalline silicate of the group FER, MWW, EUO, MFS, ZSM- 48, MTT, MFI, MEL or TON having Si/AI higher than 10, or a phosphorus modified crystalline silicate of the group FER, MWW, EUO, MFS, ZSM-48, MTT, MFI, MEL or TON having Si/AI higher than 10, or a silicoaluminaphosphate molecular sieve of the group AEL, or a silicated, zirconated or titanated or fluorinated alumina. Advantageously the stream (B) is fractionated in a step d) to produce a n-butenes stream (N) and to remove the essential part of isobutene optionally recycled with stream (A) to the dehydration/isomerization reactor of step b).
摘要:
The present invention is directed to a method for preparing renewable and relatively high purity p-xylene from biomass. For example, biomass treated to provide a fermentation feedstock is fermented with a microorganism capable of producing a C 4 alcohol such as isobutanol, then sequentially dehydrating the isobutanol in the presence of a dehydration catalyst to provide a C 4 alkene such as isobutylene, dimerizing the C 4 alkene to a form one or more C 8 alkenes such as 2,4,4-trimethylpentenes or 2,5-dimethylhexene, then dehydrocyclizing the C 8 alkenes in the presence of a dehydrocyclization catalyst to selectively form renewable p-xylene in high overall yield. The p-xylene can then be oxidized to form terephthalic acid or terephthalate esters.
摘要:
The disclosure describes a new class of isomorphously metal- substituted aluminophosphate materials with high phase purity that are capable of performing selective Brönsted acid catalyzed chemical transformations, such as transforming alcohols to olefins, with high conversions and selectivities using mild conditions. Isomorphous substitutions of functional metal ions for both the aluminum ions and the phosphorous ions were successful in various AlPO structures, along with multiple metal substitutions into a single aluminum site and/or a phosphorous site. This invention can be used towards the catalytic conversion of hydroxylated compounds of linear and/or branched moiety with the possibility of being substituted to their respective hydrocarbon products, preferably light olefins containing 2 to 10 carbon atoms, among other chemistries.
摘要:
A stationary or fluid bed dehydrogenation catalyst containing an alumina carrier, with chromium and alkali metals consisting of only sodium and potassium, added as promoters. The resultant catalyst demonstrates greater selectivity and olefin yield than prior art dehydrogenation catalysts, especially after aging.
摘要:
Gegenstand der Erfindung ist ein Verfahren zur Herstellung von Isobuten, aus MTBE-haltigen Gemischen, das folgende Schritte umfasst a) Spaltung in einem Reaktor R eines aus einem MTBE-haltigen Einsatzstoff (1a) und/oder einem MTBE-haltigen Strom (13, 5) erhaltenen Gemisches,liefernd einen Strom (6) von Reaktionsprodukten, bestehend aus Isobuten, Methanol, MTBE sowie Nebenprodukten, wobei diese aus a1) Hochsiedern, mit einem Siedebereich oberhalb von 55°C bei einem Druck von 0,1 MPa; a2) Mittelsiedern, mit einem Siedebereich von 12 bis 55°C bei einem Druck von 0,1 MPa; und a3) Leichtsiedern, mit einem Siedebereich unterhalb von 12°C bei einem Druck von 0,1 MPa bestehen; b) destillative Auftrennung des Stroms (6) in einen Strom (7), der das Produkt Isobuten und Leichtsieder enthält, und einen Strom (8), der MTBE, Methanol, Mittelsieder und Hochsieder enthält; c) destillative Auftrennung des Stroms (8) unter Erhalt eines MTBE-haltigen Stroms (10, 12) und eines methanolhaltigen Hochsieder-Stroms (9, 11); d) Rückführung eines MTBE-haltigen Stroms (10, 12, 13) in Schritt a) des Verfahrens, wobei die vollständige oder teilweise Abtrennung der Mittelsieder vor Schritt d) erfolgt aus den mittelsiederreichen Strömen (10, 12).
摘要:
The present invention is directed to renewable compositions derived from fermentation of biomass, and integrated methods of preparing such compositions.
摘要:
The present invention relates to a catalytic process for making butenes using a reactant comprising isobutanol and water. The butenes so produced may be converted to isoalkanes, alkyl-substituted aromatics, isooctanes, isooctanols, and octyl ethers, which are useful in transportation fuels.
摘要:
The invention relates to a method for reducing the content of compounds containing oxygen and/or nitrogen in material flows having an isobutene content of at least 10 wt. %. According to said method, the material flow is guided over a fixed bed of an acid-free zeolite having a mean pore size of between 0.3 and 1.5 nm, in a liquid phase, at a temperature T [in K] and at a linear speed v [in cm/min], the fixed bed having a dimension I [in cm] in the flow direction of the material flow, and T, v and I obeying the equation 2 l/v = 500 min. The inventive method prevents the formation of isobutene oligomers.
摘要翻译:公开了一种用于减少的含量的含氧和/或具有至少10重量%的异丁烯含量的流化合物,含氮其中所述线性在温度T在液相中的材料流[在K]并用的方法 速度v [在厘米/分钟]经过具有0.3的平均孔径的无酸沸石的固定床至1.5nm,其中在所述材料流动的延伸件1包括[以cm]和T,v和I的流动方向上的固定床 方程2 <(T-283 K)/ 10 K.> L / v <= 500分钟233。 的处理过程避免了异丁烯的形成。
摘要:
Catalytic dehydrogenation wherein feed is passed in one direction through the bed in a first cycle and heating gas is passed in an opposite direction in a second cycle to provide the endothermic heat of reaction and regenerate catalyst. The operation is controlled to balance properly heat absorbed during dehydrogenation and heat input during regeneration; e.g., by having catalyst of different activities over the length of the bed.