CN104208900A - Crystal catcher applied to acid anhydrides - Google Patents

Abstract

A crystal trap for acid anhydrides relates to the technical field of production of pyromellitic dianhydride and other acid anhydrides, in particular a crystal collection device thereof. It includes a cylindrical shell, the upper end of the shell is sealed and connected with the spherical upper head, and the lower end is sealed and connected with the conical lower head. The upper end and the lower end of each spring are respectively free ends. Since the spring provided in the present invention can swing freely in the casing, in addition to strengthening the heat exchange area, it can also make the material attached to the spring fall off at any time, and it is difficult for the material to stick to it. The invention has the advantages of low energy consumption, small loss, high material yield, no material blockage, continuous operation, low labor intensity, no need for washing and cleaning, and no waste water.

Description

A crystal trap for anhydrides

technical field

The invention relates to the technical field of production of pyromellitic dianhydride or other acid anhydrides, in particular to a crystal collection device thereof.

Background technique

The existing pyromellitic dianhydride crystal collection device is provided with a cylindrical shell, the upper end of the shell is sealed and connected with a spherical upper head, the lower end is sealed and connected with a conical lower head, and a circulating water jacket is set outside the shell. The cooling system is designed to fix the baffle inside the shell, and the high-temperature crystal enters from the upper head and is discharged from the bottom of the lower head after being cooled.

The disadvantages of this kind of device are: high energy consumption, large loss, incomplete collection, equipment is easy to be blocked by materials, difficult to clean, washing will cause a large amount of sewage, environmental protection pressure is high, sewage treatment costs are increased, and labor intensity is high.

Contents of the invention

The purpose of the present invention is to design a crystal trap for acid anhydrides which has low energy consumption and is not prone to clogging.

The invention comprises a cylindrical shell, the upper end of the shell is sealed and connected with a spherical upper head, and the lower end is sealed and connected with a conical lower head. The upper end of the body and the lower end of each spring are respectively free ends.

The length of the spring is the same as the length of the housing.

Since the spring provided in the present invention can swing freely in the casing, in addition to strengthening the heat exchange area, the material attached to the spring can also fall off at any time, and it is difficult for the material to stick to it. The invention has the advantages of low energy consumption, small loss, high material yield, no material blockage, continuous operation, low labor intensity, no need for washing and cleaning, and no waste water.

In order to facilitate the installation of the springs, a mesh connection frame is fixed on the upper surface of the housing, and the upper ends of the springs are respectively connected to the mesh connection frame.

In addition, in the present invention, a nitrogen gas inlet is also connected to the side wall of the casing. The anti-sticking properties of the spring, the inside of the housing, and the inside of the upper and lower heads can be further improved by periodically purging nitrogen into the interior.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

As shown in Figure 1, the present invention is provided with a cylindrical housing 1, and the upper end of housing 1 is sealed and connected with a spherical upper head 2, and the lower end is sealed and connected with a conical lower head 3, and the upper end 2 is provided with a treatment liquid. The inlet, the lower end of the lower head 3 is provided with a crystal outlet. At least one nitrogen inlet 4 is connected to the side wall of the casing 1 .

Weld and fix the mesh connecting frame 5 on the upper end surface of the housing 1, hang a number of springs 6 evenly in the housing 1 below the connecting frame 5, and the length of each suspended spring 6 is the same as the length of the housing 1 , The lower ends of each spring 6 are respectively free ends that can swing freely.

Claims (4)

1. for a kind of crystal trapping device of anhydrides, comprise cylindrical housings, spherical upper cover is tightly connected in the upper end of described housing, the lower end taper low head that is tightly connected, it is characterized in that uniform some springs in housing, the upper end of each spring is connected to the upper end of housing, and the lower end of each spring is respectively free end.

2. crystal trapping device according to claim 1, is characterized in that described spring length is identical with shell length.

3. according to crystal trapping device described in claim 1 or 2, it is characterized in that the fixing netted link in upper surface in housing, the upper end of described each spring is connected on netted link.

4. according to crystal trapping device described in claim 1 or 2, it is characterized in that connecting nitrogen access port at the sidewall of described housing.