CN214514344U

CN214514344U - Titanium polyester catalyst on-line adding device

Info

Publication number: CN214514344U
Application number: CN202023165665.8U
Authority: CN
Inventors: 王松林; 王文; 胥荣威; 李院院; 朱莎莎
Original assignee: Zhejiang Hengyi Petrochemical Co ltd; Zhejiang Henglan Technology Co Ltd
Current assignee: Zhejiang Hengyi Petrochemical Co ltd; Zhejiang Hengyi Petrochemical Research Institute Co Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-10-29
Anticipated expiration: 2030-12-24

Abstract

The utility model discloses a titanium polyester catalyst on-line adding device, which comprises a melt pipeline and an additive spray gun; the additive spray gun obliquely extends into the melt pipeline, the end part of the additive spray gun is provided with a nozzle, and the nozzle is positioned in the middle of the cross section of the melt pipeline; the injection pressure of the additive injection lance is greater than the pressure in the melt line. The utility model has the advantages that: the filling mode of the titanium catalyst is changed into on-line filling so as to meet the catalysis requirement of the catalyst and improve the quality stability of the product.

Description

Titanium polyester catalyst on-line adding device

Technical Field

The utility model belongs to the chemical industry equipment field specifically is a titanium polyester catalyst adds device on line.

Background

The most of the catalysts for PET polyester synthesis are antimony catalysts, including antimony trioxide, antimony acetate, ethylene glycol antimony and the like, and the antimony catalysts are added in a catalyst preparation kettle by adding the antimony trioxide, the antimony acetate, the ethylene glycol antimony and the ethylene glycol into the catalyst preparation kettle, heating and dissolving the antimony trioxide, the antimony acetate, the ethylene glycol antimony and the ethylene glycol until homogeneous catalyst solution is obtained, and then pumping the homogeneous catalyst solution into a slurry preparation tank by a catalyst pump to participate in esterification reaction. For example, chinese patent document CN103435786A discloses "a liquid polyester catalyst, a preparation method thereof, and an application thereof" in 2013, 12 and 11, the liquid antimony catalyst is a homogeneous solution generated by reacting an antimony compound with a modifier and ethylene glycol, wherein the content of antimony is 2.0-6.0%, and the liquid antimony catalyst is not crystallized at normal temperature, and can be directly used as a catalyst for polyester polycondensation reaction. The invention has simple synthesis process, easy operation and low cost, can save the heating, modulating and heat-preserving process of using solid antimony catalysts, has quick and convenient application and reduces the production cost of polyester.

The most serious problem of antimony catalysts is that antimony is a heavy metal and easily causes environmental pollution, so germanium (Ge) and titanium (Ti) catalysts are developed in the polyester production process, and the original antimony catalysts are hopefully replaced. Wherein the germanium catalyst restricts the application prospect due to the price factor. The titanium catalyst does not have the problem of heavy metal pollution, and the cost is obviously reduced along with the mature process and the large-scale production, so that the replacement of the antimony catalyst by the titanium catalyst is a trend change.

Because the ethylene glycol evaporation capacity in the esterification reactor is large and the catalyst entrainment is easy to cause, and water in the system is generated and is easy to cause partial catalyst hydrolysis, when the antimony catalyst is used, the catalytic effect of the antimony catalyst can be influenced by continuously adding the antimony catalyst and the slurry together, so that the quality stability of the product is influenced. Therefore, the traditional filling device and filling process of the antimony catalyst cannot be simply used.

SUMMERY OF THE UTILITY MODEL

Based on the problem, the utility model provides a titanium polyester catalyst adds device on line changes the filling mode of titanium catalyst into online filling to satisfy the catalysis requirement of catalyst, improve the stable degree of quality of product.

In order to realize the purpose of the invention, the utility model adopts the following technical scheme: an online titanium polyester catalyst adding device comprises a melt pipeline and an additive spray gun; the additive spray gun obliquely extends into the melt pipeline, the end part of the additive spray gun is provided with a nozzle, and the nozzle is positioned in the middle of the cross section of the melt pipeline; the injection pressure of the additive injection lance is greater than the pressure in the melt line.

According to the titanium polyester catalyst on-line adding device designed by the technical scheme, the side wall of the melt pipeline is provided with the hole, the additive spray gun is inserted into the inclined insertion hole, the hole is sealed and fixed, so that the nozzle opening at the front end of the additive spray gun is positioned in the middle of the cross section of the melt pipeline, the liquid titanium additive is ensured to be sprayed out of the additive spray gun and positioned in the middle of the melt pipeline, the titanium additive can be fully contacted with materials, and dead corners cannot be left. The injection pressure of the additive spray gun is higher than the pressure in the melt pipeline, so that the additive sprayed from the nozzle forms a torrent, and generates strong disturbance to the materials in the melt pipeline, and the disturbance is very favorable for the uniform dispersion of the catalyst.

Preferably, the additive lance is located on the upstream side of the melt conduit, with the downstream side being provided with a static mixer. The static mixer is designed at the downstream of the additive spray gun, and the flow state of the fluid in the static mixer can be changed by using the mixing unit body fixed in the static mixer pipe, so that the aims of good dispersion and full mixing between the fluid and the catalyst are fulfilled.

Preferably, the additive spray gun is provided with a check valve. The check valve controls the material in the melt pipeline not to reversely flow back to the additive spray gun.

Preferably, the additive injection lance is fitted with a pressure monitoring device upstream of the check valve. The pressure monitoring device can help an operator to obtain the pressure of the additive in real time, and the ratio of the catalyst to the material can be indirectly adjusted by adjusting the pressure, so that the device is suitable for different flow rates and flows of the material in a melt pipeline.

Preferably, the nozzle is provided with a guide tube, the root of the guide tube is connected to the nozzle, and the opening direction of the open end extends along the radial direction of the melt pipeline. The guide pipe is used for ejecting the catalyst along the radial direction of the melt pipeline, and the disturbance of the catalyst torrent on the materials in the melt pipeline is improved to the maximum extent.

Preferably, the number of the guide pipes is plural, and the guide pipes are randomly distributed on the nozzle, and the opening directions of the respective guide pipes are also randomly distributed in the radial direction of the melt duct. This scheme has designed a plurality of stand pipes, and the position of arranging of stand pipe is random, and the direction of stand pipe also distributes at random in the radial direction of fuse-element pipeline, consequently can carry out the disturbance to the material in wider range to better realization mixes.

The scheme can also be applied to other uses of filling a small amount of liquid additives on line for a long time.

To sum up, the beneficial effects of the utility model are that: the filling mode of the titanium catalyst is changed into on-line filling so as to meet the catalysis requirement of the catalyst and improve the quality stability of the product.

Drawings

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

Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

Fig. 3 is a schematic structural diagram of embodiment 3 of the present invention.

Wherein: 1 melt pipeline, 2 additive spray guns, 21 nozzles, 211 guide pipes, 3 check valves, 4 pressure monitoring devices and 5 static mixers; the arrows indicate the direction of flow of the feedstock or catalyst.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Example 1 is an on-line addition device of a titanium-based polyester catalyst, as shown in fig. 1. The additive spray gun comprises a melt pipe 1 extending left and right, an additive spray gun 2 is fixedly arranged on the pipe wall of the left side, namely the upstream side, of the melt pipe 1, and in the embodiment, the extending direction of the additive spray gun 2 is that the additive spray gun extends left up and left down, and the included angle between the additive spray gun and the melt pipe 1 is 45 degrees. The additive injection lance 2 is exposed to the outside of the melt channel 1, and is provided with a pressure monitoring device 4 on the upstream side and a check valve 3 on the downstream side. The additive spray gun 2 obliquely extends into the melt pipeline 1, the end part of the additive spray gun is provided with a spray nozzle 21, and the spray nozzle 21 is positioned in the middle of the cross section of the melt pipeline 1. The injection pressure of the additive injection lance 2 is greater than the pressure in the melt channel 1. On the downstream side of the melt pipe 1 where the additive injection lance 2 is located, a static mixer 5 is also installed.

In the titanium polyester catalyst on-line adding device, materials flow from left to right in the melt pipeline 1, the titanium polyester catalyst is sprayed into the melt pipeline 1 from left to right through the additive spray gun 2 to form a torrent, and strong disturbance is formed on the materials flowing stably, so that the uniform mixing of the catalyst and the materials is accelerated, and the secondary mixing is carried out by the state mixer 5, so that the process requirements can be met.

Example 2 is another titanium-based polyester catalyst on-line adding device as shown in fig. 2. In this embodiment, the nozzle 21 is provided with the guide tube 211, the root of the guide tube 211 is connected to the nozzle 21, and the opening direction of the opening end extends along the radial direction of the melt pipe 1, so that the catalyst in this embodiment forms disturbance to the material flow along the radial direction of the melt pipe 1 after being sprayed out of the nozzle 21, and the mixing effect is better.

The same as in example 1.

Example 3 is another titanium-based polyester catalyst on-line adding device as shown in fig. 3. In this example, the nozzle 21 is provided with a plurality of guide pipes 211 which are arranged randomly on the circumferential surface of the cross section of the melt duct 1 in which the nozzle 21 is located, and the opening directions of the respective guide pipes 211 are also randomly distributed in the radial direction of the melt duct 1. Therefore, the catalyst in this example is ejected from the openings of the guide pipes 211, and the ejection direction is also random, so that the disturbance range to the material flow is wider, and the mixing effect is better.

The same as in example 1.

Claims

1. An online adding device for a titanium polyester catalyst comprises a melt pipeline (1) and is characterized by further comprising an additive spray gun (2); the additive spray gun (2) obliquely extends into the melt pipeline (1), the end part of the additive spray gun (2) is provided with a nozzle (21), and the nozzle (21) is positioned in the middle of the cross section of the melt pipeline (1); the injection pressure of the additive injection lance (2) is greater than the pressure in the melt duct (1).

2. The titanium-based polyester catalyst on-line adding device as claimed in claim 1, wherein the additive spray gun (2) is located on the upstream side of the melt pipe (1), and the static mixer (5) is arranged on the downstream side.

3. The titanium series polyester catalyst on-line adding device according to claim 1 or 2, wherein the additive spray gun (2) is provided with a check valve (3).

4. The on-line titanium polyester catalyst adding device as claimed in claim 3, wherein the additive spray gun (2) is provided with a pressure monitoring device (4) at the upstream of the check valve (3).

5. The titanium-based polyester catalyst on-line adding device as claimed in claim 1 or 2, wherein the nozzle (21) is provided with a guide tube (211), the root of the guide tube (211) is connected to the nozzle (21), and the opening direction of the open end extends along the radial direction of the melt pipe (1).

6. The titanium-based polyester catalyst on-line adding device as claimed in claim 5, wherein the number of said guide pipes (211) is plural, and said guide pipes are randomly distributed on the nozzle (21), and the opening direction of each guide pipe (211) is also randomly distributed in the radial direction of the melt pipe (1).