Continuous settling tank

Abstract

The invention discloses a continuous settling tank which comprises a shell, wherein the shell is provided with a circular cylinder at the upper part and a conical cylinder at the lower part; an overflow weir is arranged in the circular cylinder; an underflow outlet is arranged at the bottom of the conical cylinder; an arch-shaped feeding slot is arranged in the circular cylinder of the shell; the arch-shaped feeding slot comprises the inner side wall of the circular cylinder, a flat wall plate, a grid distributing plate and a baseboard; the grid distributing plate is arranged under the flat wall plate; upper and lower ends of the grid distributing plate are respectively fixedly connected to the flat wall plate and the baseboard; a plurality of porous guiding vanes are symmetrically and obliquely arranged outside the flat wall plate; gaps are reserved between the guiding vanes and the flat wall plate; and a rotary rake is arranged on the conical cylinder at the lower part of the shell. By using the continuous settling tank provided by the invention, the maximum settling area is supplied as much as possible, an interior space of equipment is efficiently utilized, a settling separating effect is improved, and the loss of solid materials such as catalyst can be reduced.

Description

technical field [0001] The invention relates to a settling equipment in the field of chemical industry, in particular to a continuous settling tank. Background technique [0002] The effluent of the reaction equipment for preparing cyclohexene by partial hydrogenation of benzene under the action of a solid catalyst is a three-state four-phase reaction system: gas phase (gaseous hydrogen), oil phase (liquid benzene, cyclohexene, etc.), Aqueous phase (liquid water) and solid phase (fine particles of solid catalyst suspended in the aqueous phase). [0003] The gravity continuous settling tank used in the prior art in the phase separation process of the partial hydrogenation reaction product of monocyclic aromatic hydrocarbons, such as figure 1 As shown, the upper part is a circular cylinder and the lower part is a conical cylinder. The feed enters from the center of the top and flows down through the central reducing tube 23 until it reaches near the height of the joint betwee...

AI Technical Summary

Problems solved by technology

Moreover, multiple structures such as perforated plates 21, baffles 24, and baffles 25 are installed in the settling tank to interfere with and change the flow direction in order to promote the separation of phases, which not only leads to complex structures, but also significantly reduces the actual flow path The cross-sectional area increases the internal velocity gradient of the flow system, and makes the settling tank unable to provide the proper settling area, which damages the effect of gravity settling and even causes some operational difficulties.

[0004] In the existing technology, the continuous settling tank used in the phase separation process of the partial hydrogenation reaction product of single-ring aromatic hydrocarbons frequently changes the flow direction, causing too much interference to the flow, and the annular overflow area and the central reducing pipe occupy too much settling area , and the radial distance from the liquid outlet of the central reducer to the annular overflow weir is too short, these factors are not conducive to the separation of light and heavy phases

In addition, the arrangement of the components in the conical part is not conducive to the stability of the phase separation process, which makes it difficult to measure and control the interface between light and heavy liquid layers, resulting in additional loss of catalyst

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