Continuous catalyst-adding operation method for esterification reactor
An operation method and an esterification reaction technology, which are applied in the field of strong acid homogeneous catalysts in an esterification reactor, can solve problems such as accelerated corrosion, and achieve the effects of slowing down corrosion, increasing economic benefits, and prolonging the start-up period.
Active Publication Date: 2005-12-14
SHANGHAI HUAYI ENERGY CHEM
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Problems solved by technology
[0005] The purpose of the present invention is to solve the problem that the local acidity caused by the one-time adding method of the traditional catalyst is easy to be too concentrated to accelerate corrosion, and the concentration of the catalyst in the reactor decreases with the prolongation of the production time, but it cannot be judged in time, and it is necessary to stop frequently to add catalyst sulfuric acid, resulting in a low operating rate. Defects, improve the stability of high-rate reaction, slow down corrosion to a certain extent, prolong the start-up period of the device and the service life of the equipment, and reduce the unit production cost
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[0013] The mixed raw materials of 50% acetic acid, 45% ethanol, and 5% water are preheated to 95°C and enter the reactor in the form of a gas-liquid mixture. Internal components and heating elements arranged in a specific way are specially designed in the reactor to achieve good self-stirring Effect. Catalyst sulfuric acid is pre-added in an appropriate amount before starting up. During the operation, the catalyst is continuously added according to the catalyst concentration analyzed by the online analyzer. The reaction product is vaporized and enters the esterification tower for rectification and separation to obtain crude ester at the top of the tower.
[0014] reactor and catalyst
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The continuous catalyst adding operation method for esterification reactor features that the operation method includes mutually related three items: A. one improved operation method suitable for high reaction rate esterification catalyst system, with prolonged stable reaction period and apparatus operation life and possessing in-line analysis result fed back to control the continuous addition of catalyst; B. stable esterification conditions including stable acid / alcohol feeding ratio, stable reaction temperature and processes and stable reaction system concentration distribution; and C. strong acid homogeneous catalyst system of sulfuric acid and its derivative capable of raising reaction rate. The present invention has greatly raised reaction rate and stability, reduced local corrosion, prolonged operation period and prolonged service life of the apparatus.
Description
1. Technical field: [0001] The invention relates to a direct esterification reaction system of acetic acid and ethanol with continuous addition of catalysts, and in particular discloses an operation method in which strong acid homogeneous catalysts in esterification reactors are fed back to control continuous addition of online analysis results, and the improved operation method is used to maintain the reaction Stable and high-speed operation and slow down corrosion to extend the start-up cycle and service life. 2. Background technology: [0002] Since the direct esterification reaction of producing ethyl acetate must be carried out in the presence of a catalyst to have practical application value, most manufacturers currently use sulfuric acid as a catalyst, but sulfuric acid is highly corrosive, and its corrosiveness in dilute solutions varies with its corrosiveness. Intensified by increasing the concentration in the reaction system. For this reason, traditional esterific...
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IPC IPC(8): C07C67/00
Inventor 齐峻曾义红田伟吴云龙
Owner SHANGHAI HUAYI ENERGY CHEM
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