A kind of belt dryer and drying method for preparing solid phosphoric acid catalyst

Abstract

The invention relates to the technical field of drying devices in mechanical engineering, in particular to a belt dryer and a drying method, especially suitable for the industrial preparation of solid phosphoric acid catalysts for butene oligomerization, propylene oligomerization and styrene-propylene alkylation Belt dryer. The material conveying layer is connected to the frequency conversion speed controller, the dryer is a fully enclosed structure, the wall at the bottom of the inner cavity is fully welded, and the corners are passed through rounded corners. The catalyst particles fall from top to bottom in the dryer, and the wet material and the external dry material are alternately mixed to achieve a homogeneous effect. The hot air discharges the circulating air through the circulating fan and blows it continuously through the heat-conducting oil heater to penetrate the material layer. The shell-and-tube heater supplements the heat loss of the circulating air. After penetrating, the low-temperature hot air passes through the heat-conducting oil heater again for secondary Circulation, the material is heated and dried again by constant temperature hot air in the equipment, and the drying is completed at regular intervals before entering the next process. The invention realizes operation automation and greatly improves drying uniformity and production benefit.

Description

[technical field] [0001] The invention relates to the technical field of drying devices in mechanical engineering, in particular to a belt dryer industrially prepared from a solid phosphoric acid catalyst suitable for butene oligomerization, propylene oligomerization and benzenepropylene alkylation and a drying method thereof. [Background technique] [0002] Since the UOP company of the United States pioneered the use of solid phosphoric acid catalysts for olefin superposition in the 1930s, this catalyst is still used to produce its trimers and tetramers from propylene. UOP's commodities SPA-1, SPA-2 and SPA-5 have a history of 70 years of industrial application, and more than 300 sets of industrial devices in the world have used UOP's SPAC for a long time. However, due to the fact that the solid phosphoric acid catalyst is easy to slime, the short life of the catalyst always exists. People pay special attention to the innovation and improvement of the preparation process wh...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the shortcomings and defects such as the low degree of automation of the dryer in the prior art, and provide a belt dryer with novel structure, safety and reliability, and high production efficiency for the preparation of solid phosphoric acid catalyst, including air inlet fan, Circulating fan, transmission motor, dehumidifying fan, feeder, hopper, heat exchanger, the hopper is connected to the material conveying layer, and the circulating fan is connected to the circulating air duct, which is characterized in that each layer of material conveying layer is connected to different frequency conversion The speed regulating machine, the dryer described is a fully enclosed structure, the bottom wall of the inner cavity of the dryer is fully welded, and the corners of the inner cavity of the dryer pass through the rounded corners.

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