Molten salt internal circulating reactor with annual output of maleic anhydride up to 20,000t and reaction process thereof

Abstract

The invention discloses a molten salt internal circulating reactor with annual output of maleic anhydride up to 20,000t and a reaction process thereof. The reactor comprises an upper seal head tube box, a lower seal head tube box, a reaction tube area and a non-tube layout area, wherein the upper seal head tube box is separated from the reaction tube area through an upper tube sheet; the reactiontube area is separated from the lower seal head tube box through a lower tube sheet; the non-tube layout area is positioned at the center of a reactor; the reaction tube area is internally provided with two molten salt distribution plates which are respectively parallel to the upper tube sheet and the lower tube sheet; and the molten salt distribution plates are provided with tube holes. The reaction process comprises the following procedures of pressurizing and preheating raw materials, mixing and gasifying, carrying out oxidation reaction and the like. The invention has the advantages of compact structure, less floor space, low manufacturing cost, good heat transfer effect, small temperature difference in a bed layer, more uniform heat removal, high production load, high heat exchange efficiency, small heat loss, large gas production quantity, less energy consumption, high safety, stable operation and the like.

Description

technical field [0001] The invention relates to a reaction device and a reaction process in the production of maleic anhydride, in particular to a molten salt internal circulation reaction device and a reaction process with an annual output of 20,000 tons of maleic anhydride. Background technique [0002] Maleic anhydride is an important basic organic chemical raw material, widely used in synthetic resin, paint, pesticide, lubricating oil additive, medicine, paper treatment agent, food additive, stabilizer, plasticizer and other industries. The key part of the maleic anhydride production plant is the reactor, and the design of the molten salt channel, distribution plate and main accessories is the key to the design of the reactor. Once the heat generated by the reaction cannot be removed uniformly in time, accidents will occur and heavy losses will be caused. . At present, the domestic industrial molten salt internal circulation maleic anhydride oxidation reactor has a sing...

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Problems solved by technology

The key part of the maleic anhydride production plant is the reactor, and the design of the molten salt channel, distribution plate and main accessories is the key to the design of the reactor. 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

At present, the domestic industrialized molten salt internal circulation maleic anhydride oxidation reactor has a single production capacity of 10,000 tons per year. The advantages of the molten salt internal circulation oxidation reactor are mainly compact structure, small footprint; light weight and low cost. Low, with significant economic benefits, but the production capacity of a single 10,000 tons / year is relatively small, unable to meet the needs of market development, reducing the competitiveness of enterprises, so an independent design of an annual output of 20,000 maleic anhydride The ton-level molten salt internal circulation reactor is a major issue facing domestic enterprises at present. The maleic anhydride reactor with an annual output of 10,000 tons has only 10,000 internal tube bundles, the tube length is 3600mm, and the outer diameter of the equipment is 4100mm. The molten salt flows from the inside to the outside. , Circulation from bottom to top, the space between the tube bundles is relatively large, the distribution of molten salt is easy to be uniform, and the stable operation of the reactor can be realized. However, for the molten salt internal circulation reactor with an annual output of 20,000 tons, the number of tube bundles is greatly increased , the diameter of the reactor is increased, and the setting of a 10,000-ton reactor will not evenly distribute the molten salt in the reactor, resulting in concentrated heat, large axial and radial temperature differences, local overshoot, accidents, and heavy losses

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