A fluidized bed device for preparing aromatics from alkanes and its preparation method

Abstract

The invention discloses a fluidized bed device and a preparation method for preparing aromatic hydrocarbon from alkyl hydrocarbon. The device comprises a gas inlet, a gas outlet, a gas distributor and a catalyst recovering system, and also comprises a distributing plate, a heating pipe, an outer overflow pipe, a catalyst inlet and a deactivated catalyst outlet, wherein the distributing plate is arranged transversely in the device, the heating pipe is arranged above and below the distributing plate, the inlet and the outlet of the heating pipe are connected to the inner wall of the device, the opening of the lower part of the outer overflow pipe is connected to the lowermost catalyst bed layer, the upper part of the outer overflow pipe is parallel to the vertical direction of the device, the lower part of the catalyst inlet is connected to the left side wall of the device and the upper part of the outer overflow pipe protrudes tipsily and upwards from the left side wall of the device, the upper part of the deactivated catalyst outlet is connected to the right side wall of the device and the lower part of the deactivated catalyst outlet protrudes tipsily and downwards from the right side wall of the device. The preparation method comprises the steps of: introducing gas while adding a catalyst, electrifying or adding a medium into the heating pipe, feeding the raw material gas, separating a gas product from the catalyst, recovering the catalyst, obtaining the gas product, regenerating the catalyst, and successively repeating the processes.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a fluidized bed device and a method for preparing aromatics from alkanes. Background technique [0002] Aromatics are one of the important basic chemicals. In traditional chemical preparation, aromatics are mainly obtained through petroleum refining and coal dry distillation. Aromatics obtained from petroleum are of high purity and are suitable for the preparation of various high-quality chemicals. The aromatics obtained by coal dry distillation are of relatively low quality due to thiophene impurities, and their application is limited. With the increasing shortage of petroleum resources, the supply of aromatics is tense, and the price remains high, which greatly increases the production cost of subsequent chemicals and affects their sales. The technology of converting raw materials such as methane, liquefied gas or methanol into aromatics can form a benef...

AI Technical Summary

Problems solved by technology

At the same time, the gas-solid backmixing in the single-stage fluidized bed reactor is serious

For recalcitrant propane and / or butane, or propane and / or butane with C 5 -C 7 For non-aromatic mixtures, the process driving force is not high, the conversion rate and aromatics yield are not easy to increase, the amount of raw materials that need to be recycled increases, and the process energy consumption is high.

Moreover, although the heating tube has been used to supply heat to different systems under high temperature conditions, the strength of the heating tube under high temperature conditions will be affected due to the presence of a large number of moving particles in the fluidized bed reactor.

Therefore, the heating tube of the fluidized bed reactor should neither be too long nor too many, resulting in limited heating capacity

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