Slurry bed reactor and uses thereof

Abstract

The invention provides a slurry-bed loop reactor, comprising an ascending pipe and at least one downtake pipe 3, wherein, the ascending pipe consists of a reaction zone 1 and a settlement zone 2 withan expanded pipe diameter; an exhaust port 13 is arranged on the top of the settlement zone 2; the inside of each downtake pipe 3 is divided into a filtrate zone 5 and a slurry zone 6 by a filter medium 4, wherein, the filtrate zone 5 is communicated with a liquid discharge port 10; two ends of the slurry zone 6 are communicated with two ends of the ascending pipe 1, so the settlement zone 2 is separated into a steady flow zone 19 and a turbulent flow zone 20, wherein, the upper part of the steady flow zone 19 is communicated with the downtake pipe 3 through a pipeline 16; and the bottom of the steady zone 19 is directly communicated with the reaction zone 1 through an open pore 18 or through a draft tube 17. The slurry-bed loop reactor provided by the invention can realize continuous high-efficiency separation of solid catalyst particles, a liquid product and reacting gas, realize continuous discharging of a gas phase, a liquid phase and a solid phase, reduce turbulence of rising slurry from the reaction zone to settling particles in the settlement zone by separating the settlement zone into the turbulent flow zone and the steady flow zone, improve the separation efficiency of thesettlement zone, and reduce the filtering load of the downtake pipe, thereby improving the treating capacity and the separation efficiency of the whole reactor, and prolonging the backsurge period.

Description

technical field [0001] The present invention relates to a device and method for separating solid particles from liquid, more specifically, to a device for continuous separation of liquid and solid particles in a slurry bed loop reactor and its application method. Background technique [0002] The slurry bed reactor is a commonly used gas-liquid (slurry) contact reaction equipment with a very high liquid storage capacity. For the catalytic reaction process with large reaction heat, the use of slurry bed reactor can effectively remove the reaction heat, realize the isothermal operation of the reactor, and ensure the normal operation of the reactor, so it has been widely used in today's chemical process. The slurry bed loop reactor is a high-efficiency heterogeneous reactor developed on the basis of the slurry bed bubbling reactor. In addition to all the advantages of the slurry bed bubbling reactor, the slurry bed loop reactor can also make the internal fluid circulate regula...

AI Technical Summary

Problems solved by technology

However, using a single settling technology to achieve complete liquid-solid separation and obtaining a liquid product with a very small solid content requires a settling device with a large volume to ensure sufficient settling time, which results in most of the area and space of the equipment being covered by the settling device. In addition, the smaller the particle size of the catalyst, the more conducive the reaction is to proceed. At the same time, during the reaction process, due to the wear of the catalyst, a solid powder with a very small particle size will be produced, but the sedimentation technology is suitable for particle sizes of several microns or The separation effect of smaller catalyst particles is not good; due to the considerable diameter of the Fischer-Tropsch synthesis reactor, it is difficult for the magnetic field device to generate a uniform magnetic field in the reactor, and the equipment is heavy and expensive, and it is impossible to demagnetize the magnetized catalyst To prevent the agglomeration of the magnetized catalyst and affect the normal operation of the reactor

[0008] WO 94 / 16807 discloses a method of using a filter assembly in a reactor to achieve liquid-solid separation, but once the catalyst particles block the filter assembly, the regeneration of the filter assembly is difficult, so it is not suitable for large-scale continuous production

[0009] CN1589957A discloses that a primary separation unit is set inside the reactor, a secondary separation unit is set outside the reactor to realize liquid-solid separation, and a recoil unit is set outside the reactor to realize the continuous operation of filtration, which not only takes up The reaction space in the reactor also leads to complex equipment structure and complicated operation

This liquid-solid separation method requires the help of external power, and does not provide a detailed backwashing method, making it difficult to achieve continuous and effective separation of liquid and solid

[0012] From the above analysis, it can be seen that simply using the sedimentation method needs to occupy a large area, or even precious reaction space; and it is difficult to realize continuous operation by using the filtration method, and even if continuous operation is realized, the separation efficiency will be reduced due to the high solid content. It will also make the equipment complicated, and the investment and operation costs will increase

Images