Radial reactor for preparing ethylene (propylene) carbonate

Abstract

A radial reactor for preparing vinyl (or propenyl) carbonate has a central feeding pipe with perforated wall, concentric internal and external cylinders with pinholes, catalyst bed between said internal and external cylinders, and U-shaped tube in catalyst bed. Its advantages are high utilization rate and long service life of catalyst, high conversion rate of epoxy ethane and high selectivity.

Description

technical field [0001] The invention relates to a reactor for preparing ethylene (propylene) carbonate. . Background technique [0002] Reactor is the core equipment in industrial production. Its efficiency and characteristics have a decisive impact on the technical economy of the device. The characteristics of the catalyst and the reaction process will affect the efficiency of the reactor, which may cause local overheating of the catalyst bed and affect the quality of the product. and reactor capacity. [0003] Fette, Seifen, anstrichmittel 73,1971, the reactor used for the synthesis of ethylene (propylene) carbonate is composed of a single tube, without internal components, without product circulation, and the reaction heat generated in the reaction process is removed by means of transfer medium-cooling water, However, the efficiency of removal of reaction heat is low, the axial temperature difference of the catalyst bed is large, and the re...

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Problems solved by technology

[0002] Reactor is the core equipment in industrial production. Its efficiency and characteristics have a decisive impact on the technical economy of the device. The characteristics of the catalyst and the reaction process will affect the efficiency of the reactor, which may cause local overheating of the catalyst bed and affect the quality of the product. and reactor capacity

[0003] Fette, Seifen, anstrichmittel 73,1971, the reactor used for the synthesis of ethylene (propylene) carbonate is composed of a single tube, without internal components, without product circulation, and the reaction heat generated in the reaction process is removed by means of transfer medium-cooling water, However, the efficiency of reaction heat removal is low, the axial temperature difference of the catalyst bed is large, and the reaction temperature is as high as 220 ° C, which will damage the product; it is difficult to overcome this shortcoming in the production process of industrial devices

[0004] German Offenlegungsschrift 232 adopts flow pipe and pump to form a circulating reactor, and prepares ethylene carbonate under the conditions of 1.0-5.0MPa and 100-200°C. The reactor is connected with a stirrer; but because the reaction heat generated by the reaction cannot be controlled , so ethylene oxide will be partially converted, reducing the conversion rate of the reaction

[0005] U.S.P 5,508,442 adopts bubble cap reactor, and its length-to-diameter ratio is 2: 50, raw material carbon dioxide and oxirane (propane) alkane join in the reactor that existing reaction medium ethyl (propylene) carbonate has existed from the bottom of the reactor, reaction A distribution device is installed at the outlet on the top of the reactor to circulate the reaction product in the reactor; however, there are components such as baffles and orifice plates in the bubble reactor, and the structure is complex; and the heat of reaction still increases the temperature of the reaction system by 5-80 °C

[0006] CN 1098100A provides a kind of cyclic carbonate compound solvent, containing two kinds of components of ethylene carbonate and propylene carbonate, reaction is carried out in a synthesis tower, catalyst adopts tetraethylammonium bromide; Its shortcoming is: because of common The reaction efficiency of the synthesis tower is low, so in the implementation process of the invention, it is necessary to "enter the solution drawn from the synthesis tower into the equipment of the second synthesis tower and the finisher to continue the reaction", and "the composite solvent crude product produced by it needs intermittent vacuum distillation Purification", in addition, the tetraethylammonium bromide used is a homogeneous catalyst, which is not easy to separate from the reaction product system, which will affect the product purity and increase equipment investment

[0007] CN 0311145914.5 provides a circulation reactor "when reactants (carbon dioxide and ethylene oxide (propylene) alkane), catalyst (homogeneous or heterogeneous catalyst), and reaction medium (ethylene (propylene) carbonate) are discharged from the circulation pump outlet into the reactor, sprayed from the jet injector or tube distributor, so that the homogeneous or heterogeneous mixture can fully contact the mixed reaction", the disadvantage of this method is that there are more catalysts circulating together with the reaction materials, and the loss is relatively large. Regularly add catalyst

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