Isophthalonitrile dry trapping device and trapping method

Abstract

The invention provides an isophthalonitrile dry trapping device. According to the device, a catcher body composed of two sets of inverted isosceles trapezoid faces and rectangular faces which are symmetrically arranged is adopted, dead corners can be avoided to the maximum extent, the side face inclination angle can be reduced to the maximum extent, it is guaranteed that solid products are scattered on the wall face and slide down smoothly, and therefore the dry catching efficiency is improved; a dry trapping method using the device not only can realize continuous closed production, but also reduces the escape of isophthalonitrile tail gas, and greatly improves the field production environment.

Description

technical field [0001] The invention relates to the technical field of synthesis gas separation and treatment, in particular to a dry-process capture device and a capture method for isophthalonitrile. Background technique [0002] Isophthalonitrile (IPN) is an important organic raw material for organic synthesis. Tetrachloroisophthalonitrile synthesized by chlorination is an efficient and low-toxic fungicide; m-xylylenediamine obtained by hydrogenation is a superior performance The epoxy resin curing agent is also the raw material of polyurethane resin and nylon resin. Among them, its main function is to be used as the raw material for the synthesis of chlorothalonil. To prevent crops from being infected by fungi, it is also used as an industrial antifungal agent, fruit preservative, and protective agent for coatings and adhesives. [0003] Due to the complicated process of separation and purification of isophthalonitrile synthesis gas in the production process, there are m...

AI Technical Summary

Problems solved by technology

However, the dry capture has the problems of low capture efficiency, serious sticky material on the inner wall, and frequent start-up and shutdown; while the wet capture has a series of problems such as large amount of wastewater, difficult treatment, and difficult separation, which seriously affect production efficiency and product quality. There are also safety and environmental issues

[0004] CN205586600U discloses a kind of improved isophthalonitrile thin-wall catcher, but the vibration force of the hollow hanging board of this device is subjected to the bin wall vibrator is less, under the effect of this vibration force and gravity, desublimation is on the hanging board wall The upper solid isophthalonitrile cannot fall completely to the bottom of the trap cone in time, so it will gradually accumulate and block the passage for gaseous isophthalonitrile to enter, and finally the outside of the hollow hanging board wall will be completely desublimated into a solid state The isophthalonitrile wrapped in the air will lose the function of further cooling and trapping gaseous isophthalonitrile, so that the overall collection yield of the trap will be greatly reduced, and the residual rate of isophthalonitrile in the tail gas will be high.

[0005] CN201384868Y discloses an isophthalonitrile water spray absorption and capture system, but the structure of the capture system is relatively complex, requiring multiple devices to cooperate with each other, and multi-stage absorption towers are required to complete the capture of isophthalonitrile

[0006] CN101955447B discloses a method of solvent capture, which requires the addition of additional organic solvents, and the energy consumption of two-stage rectification is relatively high

Therefore, in order to overcome the problem of low collection efficiency of existing dry traps, it is urgent to develop a dry trap with a new structure.

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