Phthalic anhydride reactor

Abstract

The present invention belongs to the field of phthalic anhydride producing apparatus, and is especially one kind of phthalic anhydride reactor. The phthalic anhydride reactor includes one cylindrical shell with gas inlet, gas outlet, molten salt inlet and molten salt outlet; one molten salt passage inside the shell; one tube array and one baffle plate with holes matching the tube array. It features the belled molten salt inlet and molten salt outlet, the molten salt passage with crossed small holes and large holes, and the circular baffle plate matching the inner side of the shell. The present invention has the advantages of low cost, stable operation and high yield.

Description

technical field [0001] The invention belongs to phthalic anhydride production equipment, in particular to a phthalic anhydride reactor. Background technique [0002] Phthalic anhydride is an important basic organic chemical raw material, which is widely used in plasticizers, dyes, coatings, pharmaceuticals and other industries. The key part of the phthalic anhydride production device is the reactor, and the design of the molten salt channel and baffles is the key to the reactor. The design is critical. Once the heat generated by the reaction cannot be removed in a timely and uniform manner, accidents will occur and heavy losses will be caused. Since foreign manufacturers are highly confidential about their core technology, and the equipment is imported as a whole, domestic surveying and mapping is not possible. The reactors of large-scale phthalic anhydride plants of more than 1 ton have been imported. Because the reactors produced by foreign manufacturers are expensive, the...

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Problems solved by technology

[0002] Phthalic anhydride is an important basic organic chemical raw material, which is widely used in plasticizers, dyes, coatings, pharmaceuticals and other industries. The key part of the phthalic anhydride production device is the reactor, and the design of the molten salt channel and baffles is the key to the reactor. The design is critical. Once the heat generated by the reaction cannot be removed in a timely and uniform manner, accidents will occur and heavy losses will be caused. Since foreign manufacturers are highly confidential about their core technology, and the equipment is imported as a whole, domestic surveying and mapping is not possible. The reactors of large-scale phthalic anhydride plants of more than 1 ton have been imported. Because the reactors produced by foreign manufacturers are expensive, the production costs of domestic phthalic anhydride production enterprises remain high and the competitiveness of domestic enterprises has been reduced. Reactors with large output are currently a major issue facing domestic enterprises. At present, the area of ​​baffles in reactors of about 20,000 tons is smaller than the internal cross-sectional area of ​​the reactor shell, and they are installed inside the shell in a staggered manner to achieve For the advection movement of the molten salt in the reactor, there are molten salt channels on the shell of the molten salt inflow and outflow, and the molten salt channels are equidistant on the reactor shell according to the flow direction of the molten salt. Long holes or round holes arranged in order from large to small, because the number of tube bundles inside the reactor of about 20,000 tons is only 9800, and the space between the tube bundles is relatively large, the above settings can realize the stable operation of the reactor, however , for a 50,000-ton reactor, the number of tube bundles is greatly increased, and the diameter of the reactor is increased. If the above-mentioned settings are used, the molten salt cannot be evenly distributed in the reactor, resulting in a large temperature difference between the axial and radial directions, and local temperature fluctuations.

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