Solid-liquid cyclone and device and method for producing paraxylene

Abstract

The invention discloses a solid-liquid cyclone and a device and a method for producing paraxylene. The solid-liquid cyclone comprises a cyclone separator underflow pipe, a cone separation section and a cylindrical separation section provided with a cyclone inlet which are sequentially communicated from bottom to top, the top of the first-stage overflow pipe is communicated with the bottom of the second-stage overflow pipe, the first-stage overflow pipe is arranged inside the cylindrical separation section, the second-stage overflow pipe is arranged outside the cylindrical separation section, and the cyclone separator underflow pipe and the cone separation section are communicated with each other. A plurality of guide vanes are arranged on the surface of the primary overflow pipe; to-be-separated substances containing solids and liquid enter the cylindrical separation section from an inlet of the cyclone, the liquid enters the solid-liquid cyclone from the bottom of the first-stage overflow pipe and flows out of the solid-liquid cyclone from the top of the second-stage overflow pipe, the solids enter the cone separation section and flow out of an underflow pipe of the cyclone separator, and the guide vanes are used for guiding and blocking the solids. The solid-liquid cyclone is used for producing paraxylene, and has the advantages of low separation energy consumption, high recovery rate and capability of separating various raw materials with different concentrations at the same time.

Description

technical field [0001] The invention relates to a solid-liquid cyclone and a device and method for producing p-xylene. Background technique [0002] Paraxylene (PX) is an important organic chemical raw material, mainly used to prepare purified terephthalic acid (PTA), and polyethylene terephthalate (PET) made from PTA is widely used in people's daily life in life. [0003] Separation of C8 aromatics is the main production method of p-xylene. At present, crystallization separation method and simulated moving bed adsorption separation method are mainly used in industry. [0004] CN1938247A discloses a method for recovering p-xylene using ammonia absorption refrigeration, specifically, the method comprises: cooling the hydrocarbon feedstock in at least one refrigerated crystallization stage, by evaporating at least a part of the basic liquid comprising ammonia flow to indirectly cool the crystallization stage. The method prepares p-xylene crystals through cryogenic crystalli...

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Problems solved by technology

[0007] Aiming at the problems in the prior art that the separation effect is not good, the recovery rate needs to be improved, the separation energy consumption is high, and the device used is expensive, etc., the present invention provides a new solid-liquid cyclone, which adopts the solid-liquid cyclone The production of p-xylene has the advantages of low separation energy consumption, high recovery rate, simultaneous separation of various raw materials with different concentrations, and low device prices

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