Large-scale equipment of selective molecular sieve gel-forming crystallization kettle

Abstract

The invention relates to large-scale equipment of a selective molecular sieve gel-forming crystallization kettle, the equipment is a vertical stirring kettle with a jacket and a full volume of 52 m < 3 >, and comprises a stirring device and an inner kettle body. The stirring device is of a vertical stirring structure and is formed by sequentially connecting a motor, an upper transmission sealing assembly with a balance tank, a coupling assembly and a stirring assembly from top to bottom. The stirring assembly is a three-layer four-inclined-blade turbine type stirring paddle, and the stirring paddle at the bottommost layer is close to the bottom of the inner kettle body; the inner kettle body is formed by connecting an upper elliptical head, a straight cylinder section and a lower elliptical head; the top of the upper elliptical head is provided with a feed port and an exhaust port, and the bottom is provided with a discharge port; a heating coil is arranged in the straight cylinder section; a jacket is arranged on the outer sides of the straight cylinder section and the lower elliptical head, and a spiral guide plate is arranged in the jacket; an emptying pipe and a sealing liquid output pipe are arranged on one side of the upper transmission sealing assembly, and the sealing liquid output pipe is connected with a balance tank. According to the invention, the product quality can be ensured, the labor intensity is reduced, and the productivity of a single reaction kettle is improved.

Description

technical field [0001] The invention relates to the technical field of type-selective molecular sieve production, in particular to a large-scale equipment for gel-forming and crystallizing kettle of type-selective molecular sieve. Background technique [0002] Shape-selective molecular sieves are one of the most important catalytic materials in petroleum processing and petrochemical reactions. They are widely used in industrial processes such as aromatization, isomerization, alkylation, oil refining, and diesel decondensation. [0003] Most of the domestic production of size-selective molecular sieves adopts the hydrothermal synthesis process. The leading equipment of this production process is the colloidal crystallization kettle, which is the first process in the entire production process and determines the output and quality of the product. At present, the hydrothermal synthesis process used in the domestic catalyst industry adopts a total volume of 14.6m 3 The crystalli...

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Problems solved by technology

[0004] (1) The agitator is a three-layer upward-curved paddle blade, and there is a phenomenon of solid hanging on the wall of the reactor. After a period of use, the reactor needs to be cleaned

The bottom of the kettle that cannot be touched by the agitator is prone to deposit crystals, and improper operation may easily lead to outlet blockage, making it difficult to discharge

[0005] (2) The heating surface of the crystallization kettle is only the jacket, and the heating area of ​​the jacket is limited, so the reaction process takes a long time to heat up; in order to meet the production capacity requirements, usually multiple crystallization kettles are used in parallel, and the reaction process is intermittent operation. During the process, frequent switching is required to complete the process of feeding, heating, constant temperature reaction, cooling and unloading of each reactor, and the work intensity is high.

[0006] (3) During the synthesis of molecular sieves, the templating agent n-butylamine needs to be added. This substance is a flammable, explosive, and dangerous medium. Under the conditions of reaction temperature, some n-butylamine vaporizes at the top of the crystallization tank, and the crystallization tank stirrer is The sealing structure of the agitator of the existing equipment is a packing seal, and the sealing structure is unreliable. Once a leak occurs, it will not only cause waste and reduce the product yield, but also the poisonous, flammable and explosive gas leaked from the kettle will damage the device and Great harm to the surrounding environment

[0007] ⑷If you want to increase the production capacity, you need to increase the number of equipment and occupy a large area

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