• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A multi-stage reactor for the oxidation of alkyl aromatics, e.g. a mixture of p-xylene and methyl p-toluate in a liquid phase reaction mixture with oxygen-containing gases, e.g. air, under elevated pressure and at an elevated temperature in the presence of an oxidation catalyst is in the form of an elongated closed tank with a multiplicity of neighboring reaction chambers arranged successively from one end to the other end of the tank for containing the liquid reaction mixture at predetermined levels in each chamber. The reactor is provided with an oxidizing gas feed system for introducing an oxidizing gas into each chamber, feed means for introducing at least one alkyl aromatic reactant and an oxidation catalyst into at least one of the reaction chambers, a vapor-collecting conduit means in communication with each of said chambers for removing reaction gas from each of said chambers, and a discharge means for removing the oxidized product from the reactor tank. An internally disposed cooling conduit system containing a coolant for removing the heat of reaction is provided and includes a group of cooling conduits for each of the reaction chambers. These groups have horizontally disposed cooling conduits through which a cooling medium flows.
    公开号:SU1056879A3
    申请号:SU813230705
    申请日:1981-01-20
    公开日:1983-11-23
    发明作者:Шейнген Антон；Шрейдер Гейнрих
    申请人:Динамит Нобель Аг (Фирма)；
    IPC主号:
    专利说明:

    11 This invention relates to catalytic oxidation of alkyl alkyl aromates, in particular to reactors for the catalytic liquid phase oxidation of alkyl aromates. secondary steam and oxidation product, as well as internal vertical cooling pipes lj. The known reactor has the following disadvantages. Vertical cooling tubes prevent high-efficiency heat transfer, resulting in the need to run the reactor with a relatively large height, and this causes the volume to be poorly used and the unit volume / time is not completely satisfactory. reactor time pre & The reaction of the reaction product at the oxidation temperature is too long, resulting in decomposition reactions, which lead to a decrease in the yield of the target product. Almost the entire upper half of the reaction chamber serves only to establish the cooling surfaces necessary to remove the heat of reaction. Most of the cooling surfaces are located at a large distance from the point of supply of the oxidizing gas. Therefore, the heat transfer path dd from the zone of its formation to its zone of discharge is relatively long, which leads to local overheating of the product, which means a decrease in the yield of the target product. The closest to the invention to the technical essence is a fixed-bed multi-chamber reactor for catalytic oxidation of sulfur dioxide, made in the form of a vertical cylindrical body and equipped with a pipe for supplying the source gas containing sulfur dioxide and oxygen, located in the upper part along the reactor axis , Pipeline for removal of oxidation products, located under the last layer of catalyst and cooling pipelines, combined into bundles, located Perpendicular to the axis of the reactor and between the catalyst beds 2. When using alkyl aromates for catalytic oxidation, the reactor has the following disadvantages. Because of the vertical design, a liquid column is obtained through which the oxidant gas can flow only when using compressors. oxidation temperature is too long, leading to decomposition reactions and, thus, loss of yield of oxidation products. Most of the cooling surfaces are a large distance from the carrier gas supply conduit. This leads to the fact that the Heat transport path from the places where the heat of reaction is formed to those places where it is withdrawn is very long. This leads to local overheating of the reaction products that form, which negatively affects the yield of the target product. The purpose of the invention is to increase the yield of oxidation products. This goal is achieved by the fact that the reactor for the catalytic liquid phase oxidation of alkyl aromates. containing a multi-chamber cylindrical body with pipelines for supplying an oxidizing gas, reagents and a catalyst and withdrawing secondary steam and oxidation products and located along the axis of the body perpendicular to it, internal cooling heat exchangers are located horizontally, and the outlet openings of the pipeline of oxidizing gas are located the length of the reactor under the internal cooling heat exchangers. In addition, the reactor is equipped with piping connecting chambers with circulation pumps. The control pumps are equipped with control devices that determine the level of the reaction mixture. The reactor can have one or several reaction chambers, which can be separated from each other by means of partitions and / or sliding bottoms and are equipped with circulation pumps and pumps that determine the level the reaction liquid. Separating reaction chambers from each other are located to form a joint space for the secondary riapa. The reaction chambers can be connected to each other by external pipelines for secondary steam. Figs, -C shows variants of a multi-chamber reactor; in fig. 5 reactor with one chamber; in fig. 6 parts of a coolant system with coolant circulation. The reactor is made in the form of a horizontal cylindrical body 1 containing successive reaction chambers separated by bulkheads 2 and equipped with cooling pipes 3, pipes and 5 for supplying oxidant gas and withdrawing the oxidation product, circulation pumps 6 and agitators 7 Through pipes 8 for secondary the steam and return lines 9, as well as through the compressor 10 and the intercooler 11, remove the oxidizer completely or partially reacted in hectare and recycle to the first reactions in place 12 these cameras. Piping 13-5 serves to supply para-xylene, para-toluic acid methyl ester and a catalyst. The heat exchanger 16 is used to preheat the oxidant gas. Shown in FIG. 3 and a variant of the horizontal reactor 1 contains reaction chambers separated by bulkheads 2 and a bottom 17, the pump 1B being used to compensate for different pressures. In the reaction chambers, separated by bottom 17, the pressure is maintained such that the return pipe 9 does not completely react; The oxidant gas can be recycled to the first reaction chambers. Use of the blower. The residence time of the liquid phase or the reagents suspended in it is controlled in separate reaction chambers by means of instruments for determining the level of the reaction mixture. The reactor variant depicted in FIG. 5 corresponds mainly to that depicted in FIG. 1- reactors. Instead of several cameras, it has only one camera. Cooling tubes are usually cooled by evaporation with natural circulation, if the temperature of the surface precludes crystallization of the reaction product. It is also possible to be cooled by evaporation during a circulating circulation.
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    权利要求:
    Claims (3)
    [1]
    1. REACTOR FOR CATALYTIC LIQUID OXIDATION OF ALKYLAROMATES, comprising a multi-chamber cylindrical body with pipelines for supplying an oxidizing gas, reagents and a catalyst and removal of secondary steam and oxidation product and internal cooling heat exchangers located perpendicular to it, distinguishing with that that, in order to increase the yield of oxidation products, the reactor is located horizontally, and the outlet openings of the oxidizing gas supply pipe are located along the entire length of the reactor under the internal them cooling heat exchangers.
    [2]
    2. The reactor according to claim 1, characterized in that it is equipped with pipelines connecting the chambers to the circulation pumps.
    [3]
    3. The reactor according to claim 2, characterized in that the circulation pumps are equipped with control devices that determine the level of the reaction mixture.
    Camera Camera
    13 1415 ^ SU, „, 1056879
    Ψιιζί
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19782805915|DE2805915C3|1978-02-13|1978-02-13|Reactor for the oxidation of mixtures of p-xylene and p-toluic acid methyl ester with oxygen-containing gases in the liquid phase|
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