64results about How to "Reasonable temperature distribution" patented technology

The invention relates to a method for converting oxygenated chemicals to generate low-carbon olefins, and mainly solves problems of undermixing catalysts and low-yield low-carbon olefins in a reaction zone in the prior art. The method for converting the oxygenated chemicals to generate the low-carbon olefins includes that the oxygenated chemicals are contacted with molecular sieve catalysts in a fluidized bed reactor, generated gaseous products with low-carbon olefins flow out of the fluidized bed reactor, and to-be-generated catalysts which are already generated enter into a reaction settler; the to-be-generated catalysts in the reacting settler enter a blender and the reactor after steam stripping, and the catalysts in the blender are divided into two parts after being blended and then enter the reactor and a regenerator; and the catalysts in the regenerator are contacted with a regenerated medium to form regenerated catalysts, and the regenerated catalysts enter a regenerated settler, and the regenerated catalysts are divided into two parts and respectively enter the blender and the reactor after steam stripping. According to the technical scheme, the method solves the problem effectively and is adaptable to industrial manufacture for converting the oxygenated chemicals to generate the low-carbon olefins.

The invention relates to a method for producing low carbon olefin with an oxygen compound, which mainly solves the problems in the prior art that catalysts in a reaction area are not mixed uniformly and the yield of low carbon olefin is lower. According to the method, a raw material of oxygen compound is contacted with a molecular sieve based catalyst in a fluidized bed reactor so as to generate the olefin containing low carbon and the catalyst to be produced, after gas-solid separation, a gaseous product containing low carbon olefin flows out from the top of the reactor, the catalyst to be produced enters a reaction settler, after steam stripping, the catalyst to be produced enters a mixer so as to be mixed with a reproduced catalyst to be divided into two parts, the first part enters the fluidized bed reactor after heat transfer through a heat exchanger, the second part enters a reproducer, the catalyst is regenerated in the reproducer and then enters a stripper, after steam stripping, the reproduced catalyst enters the mixer. The method better solves the problems and can be used for industrial production of preparation of low carbon olefin through oxygen compound transformation.

The invention relates to a catalyst for preparing oxalate through CO gas phase synthesis and a preparation method and application of the catalyst. The catalyst is mainly used for solving the problems that activity and selectivity are low and stability is poor in the prior art. According to the adopted technical scheme, the catalyst comprises, by weight, an active component, an additive, a modifying agent and a carrier, wherein palladium is adopted as the active component with the using amount elementally accounting for 0.1-4.0% of the weight of the carrier, a rare earth element is adopted as the modifying agent with the using amount elementally accounting for 0.1-3.0% of the weight of the carrier, aluminum oxide is used the carrier which is modified by the rare earth element, the specific area of the aluminum oxide carrier is 3-40 m<2> / g, and the pore volume with the pore diameter being 15-40 nanometers accounts for 75%-95% of the total pore volume. Accordingly, the problems are well solved, and the catalyst can be used in industrial production for preparing oxalate through CO gas phase synthesis.

The invention relates to a CO gaseous-phase synthetic oxalic ester catalyst, a preparation method and application. The CO gaseous-phase synthetic oxalic ester catalyst mainly solves the technical problems of low activity and selectivity and low stability existing in the prior art. The catalyst is prepared from the following components in percentages by weight: a) using palladium as an active component, wherein the dosage of the active component is 0.1% to 4.0% of the weight of a carrier; b) using at least one element of IV B family or the sixth period in the periodic table of elements as an accessory ingredient, wherein the dosage of the accessory ingredient is 0.05% to 4.0% of the weight of the carrier; and c) using aluminum oxide as the carrier, wherein the specific surface area of the aluminum oxide carrier is 3 to 30 square meters per gram, and the average pore diameter of the aluminum oxide carrier is 15 to 40 nm. The catalyst can be used in industrial production of CO gaseous-phase synthetic oxalic ester.

A process for preparing the H2-enriched gas by catalytic gasification of solid fuel features that the solid catalyst used also as the heat carrier is circulating through riser combustion reactor, solid catalyst storage tank, catalytic reforming reactor and pyrolyzing reactor. In said pyrolyzing reactor, the biomass or coal and the solid heat carrier (catalyst) take part in fast pyrolytic reaction.Its resultant and the water steam take part in catalytic decomposing and reforming reaction to generate H2-enriched gas or synthetic gas.