CN112677363A - Method and device for filtering particle impurities in dilute-phase pneumatic conveying purified terephthalic acid product - Google Patents
Method and device for filtering particle impurities in dilute-phase pneumatic conveying purified terephthalic acid product Download PDFInfo
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- CN112677363A CN112677363A CN201910992885.0A CN201910992885A CN112677363A CN 112677363 A CN112677363 A CN 112677363A CN 201910992885 A CN201910992885 A CN 201910992885A CN 112677363 A CN112677363 A CN 112677363A
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Abstract
The invention belongs to the field of production of high polymer materials, and particularly relates to a method and a device for filtering particle impurities in a dilute-phase pneumatic conveying purified terephthalic acid product, wherein the method comprises the following steps: under the conditions that the pressure of conveying gas is 0.05-0.10 MPa and the filtering pressure difference is 0.01-3 KPa, the fluid for conveying PTA always keeps a contact angle of 70-85 degrees with the contacted filter screen, granular impurities are blocked by the contacted filter screen and deposited at the bottom of the pipeline filter, and the PTA with the impurities removed is conveyed to a downstream device along with the fluid. The device is as follows: the PTA alkene phase pneumatic conveying pipeline is provided with a pipeline filter, a plurality of filter screens are arranged in the pipeline filter, and each filter screen keeps a contact angle of 70-85 degrees with flowing fluid contacting with the filter screen. The method adopts a pipeline filter for the first time, combines reasonable air conveying parameters and a filter screen with excellent performance, has the particle impurity removal rate of more than 99 percent, and has simple operation, low maintenance cost and good application prospect.
Description
Technical Field
The invention belongs to the field of production of high polymer materials, and particularly relates to a method and a device for filtering particle impurities in a dilute-phase pneumatic conveying purified terephthalic acid product.
Background
Terephthalic acid, also known as p-phthalic acid, is the largest-yielding dicarboxylic acid, is produced primarily from p-xylene, and is the primary feedstock for polyester production. Is solid at normal temperature. Heating to 300 deg.C for sublimation without melting. If heated in a closed container, it can be melted at 425 ℃. Is insoluble in water at normal temperature. It is mainly used for manufacturing synthetic polyester resin, synthetic fiber, plasticizer and the like.
Purified Terephthalic Acid (PTA) is one of important bulk organic raw materials, is mainly used for producing polyester fibers (terylene), polyester films and polyester bottles, is widely used in various aspects of national economy such as chemical fibers, light industry, electronics, buildings and the like, and is closely related to the height of the living standard of people.
In the process of oxidizing paraxylene to generate Purified Terephthalic Acid (PTA), part of intermediate products and byproducts can form blocky particles to products, and part of equipment accessories such as fillers, sealing rings or small parts are carried in the products to form particle impurities. Particulate impurities can interfere with the proper operation of downstream equipment.
The existing method for removing impurities in PTA products mainly comprises a bin vibrating screen, wherein the method mainly removes granular impurities in the products by moving an equipment vibrating screen, and has the defects of easy blockage, high operation and maintenance cost and the like.
Disclosure of Invention
The invention aims to provide a method for filtering particle impurities in dilute-phase pneumatic conveying purified terephthalic acid products, which adopts a pipeline filter for the first time, combines reasonable pneumatic conveying parameters and a filter screen with excellent performance, has the particle impurity removal rate of more than 99 percent, and has the advantages of simple operation, low maintenance cost and good application prospect.
The technical scheme of the invention is that the method for filtering particle impurities in dilute phase pneumatic conveying purified terephthalic acid products comprises the following steps: in the flowing direction of fluid in the PTA alkene phase pneumatic conveying pipeline, the fluid for conveying the PTA always keeps a contact angle of 70-85 degrees with a contacted filter screen under the conditions that the conveying gas pressure is 0.05-0.10 MPa and the filtering pressure difference is 0.01-3 KPa, granular impurities are blocked by the contacted filter screen and deposited at the bottom of a pipeline filter, and the PTA with the impurities removed is conveyed to a downstream device along with the fluid.
Preferably, under the conditions that the conveying air pressure is 0.10MPa and the filtering pressure difference is 1.5-2 KPa, the fluid for conveying the PTA always keeps a contact angle of 80 degrees with the contacted filter screen, granular impurities are blocked by the contacted filter screen and deposited at the bottom of the pipeline filter, and the PTA with the impurities removed is conveyed to a downstream device along with the fluid.
A device for filtering particle impurities in dilute phase pneumatic conveying purified terephthalic acid products comprises a pipeline filter arranged on a PTA olefin phase pneumatic conveying pipeline, a plurality of filter screens are arranged in the pipeline filter, and each filter screen keeps a contact angle of 70-85 degrees with flowing fluid in contact with the filter screen.
The number of the filter screens is more than 2, preferably 5-10.
And a drain outlet is arranged at the bottom of the pipeline filter.
Each filter screen is in an inclined state deviated to the tail end of the fluid flowing direction or in an inclined state deviated to the head end of the fluid flowing direction.
And each filter screen is parallel to each other or is connected in front and back.
The longest axis of the mesh of each filter screen is 0.2-0.6 cm, preferably 0.45-0.5 cm.
And each filter screen is made of stainless steel.
Compared with the prior art, the invention has the beneficial effects that:
1. the pipeline filter is used on the PTA dilute phase pneumatic conveying pipeline for the first time.
2. According to the characteristics of particle impurities in PTA, a proper filter screen is selected, and proper gas transmission parameters are controlled, so that the impurity removal rate in the PTA material reaches more than 99%, and the stable operation of a subsequent device is ensured.
The suitable filter screen performance parameters are: the shape of the mesh is not limited, and the longest axis of the mesh is 0.2-0.6 cm; the angle between the installation direction of the filter screen and the flowing direction of fluid in the pipeline is 70-85 degrees; the filter screen is made of stainless steel and is corrosion-resistant; the filter screen has a single-side crossed stainless steel strip as an auxiliary support, and the strength is high. And
suitable gas delivery parameters are: the conveying gas pressure is 0.05-0.10 MPa; the filtration pressure difference is 0.01 to 3 KPa.
3. The method has the advantages of low maintenance cost, simple operation, high impurity removal rate and the like, and has good application prospect because the granular impurities in the product are removed by the vibration sieve of the existing equipment and the pipeline filter is static equipment.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be apparent to those skilled in the art that several modifications and improvements can be made without departing from the inventive concept. All falling within the scope of the present invention.
As shown below, the pipeline filter is arranged on the PTA olefin phase pneumatic transmission pipeline:
in the fluid flowing direction in the PTA alkene phase pneumatic conveying pipeline, a plurality of filter screens arranged in the pipeline filter keep an acute angle of 70-85 degrees with the fluid flowing direction, the filter screens can be mutually parallel or can be connected in a front-back mode, the filter screens can be in an inclined state deviating from the tail end of the fluid flowing direction or a inclined state deviating from the head end of the fluid flowing direction, and the filter screens are supported in an auxiliary mode by single-side crossed stainless steel. The bottom of the pipeline filter is provided with a drain outlet for removing the particle impurities intercepted by the pipeline filter.
According to the requirements of corrosion, conveying resistance, impurity content and the like of the PTA dilute-phase pneumatic conveying pipeline, a stainless steel is selected to manufacture the filter screen, and the longest axis of the mesh of the filter screen is 0.2-0.6 cm.
After the PTA dilute phase pneumatic conveying pipeline filter is used, the impurity removal rate in the PTA material reaches more than 99%.
The method for removing the particle impurities in the purified terephthalic acid product by adopting the pipeline filter comprises the following steps: in the flowing direction of fluid in the PTA alkene phase pneumatic conveying pipeline, the fluid for conveying the PTA always keeps a contact angle of 70-85 degrees with a contacted filter screen under the conditions that the conveying gas pressure is 0.05-0.10 MPa and the filtering pressure difference is 0.01-3 KPa, granular impurities are blocked by the contacted filter screen and deposited at the bottom of a pipeline filter, and the PTA with the impurities removed is conveyed to a downstream device along with the fluid.
The filter screens contacted with the fluid for conveying PTA can be arranged in 2, 3, 4, 5 or more, and the adjacent filter screens can be kept in parallel or connected end to end.
The filter screen in contact with the fluid to be transported PTA may be inclined toward the trailing end of the fluid flow direction or may be inclined toward the leading end of the fluid flow direction.
Claims (8)
1. A method for filtering particle impurities in dilute phase pneumatic conveying purified terephthalic acid products is characterized by comprising the following steps: in the flowing direction of fluid in the PTA alkene phase pneumatic conveying pipeline, the fluid for conveying the PTA always keeps a contact angle of 70-85 degrees with a contacted filter screen under the conditions that the conveying gas pressure is 0.05-0.10 MPa and the filtering pressure difference is 0.01-3 KPa, granular impurities are blocked by the contacted filter screen and deposited at the bottom of a pipeline filter, and the PTA with the impurities removed is conveyed to a downstream device along with the fluid.
2. The method as claimed in claim 1, wherein the PTA-conveying fluid always keeps a contact angle of 80 degrees with the contacted filter screen under the conditions that the conveying gas pressure is 0.10MPa and the filtering pressure difference is 1.5-2 KPa, the granular impurities are blocked by the contacted filter screen and deposited at the bottom of the pipeline filter, and the PTA from which the impurities are removed is conveyed to a downstream device along with the fluid.
3. The apparatus for filtering particulate impurities from a dilute phase pneumatic conveying purified terephthalic acid product according to claim 1 or 2, wherein the apparatus comprises a PTA olefin phase pneumatic conveying pipeline provided with a pipeline filter, wherein the pipeline filter is internally provided with a plurality of filter screens, and each filter screen maintains a contact angle of 70-85 degrees with a flowing fluid in contact with the filter screen.
4. The apparatus of claim 3, wherein the number of the filter screens is 2 or more.
5. The apparatus of claim 3, wherein each filter screen is inclined toward the trailing end of the fluid flow direction or inclined toward the leading end of the fluid flow direction.
6. The apparatus of claim 3, wherein each of the filter screens is parallel to each other or connected in tandem.
7. The apparatus of claim 3, wherein the longest axis of the mesh of each filter screen is 0.2-0.6 cm.
8. The apparatus of claim 3, wherein the bottom of the duct filter is provided with a drain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910992885.0A CN112677363A (en) | 2019-10-18 | 2019-10-18 | Method and device for filtering particle impurities in dilute-phase pneumatic conveying purified terephthalic acid product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910992885.0A CN112677363A (en) | 2019-10-18 | 2019-10-18 | Method and device for filtering particle impurities in dilute-phase pneumatic conveying purified terephthalic acid product |
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| CN112677363A true CN112677363A (en) | 2021-04-20 |
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| CN201910992885.0A Pending CN112677363A (en) | 2019-10-18 | 2019-10-18 | Method and device for filtering particle impurities in dilute-phase pneumatic conveying purified terephthalic acid product |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH315304A (en) * | 1951-08-25 | 1956-08-15 | Mann & Hummel Filter | Separator for pneumatically conveyed granular material. |
| CN103418195A (en) * | 2013-09-11 | 2013-12-04 | 湖南麓南脱硫脱硝科技有限公司 | Deashing and pre-dedusting device for SCR denitration system |
| JP2014188403A (en) * | 2013-03-26 | 2014-10-06 | Kawata Mfg Co Ltd | Air stream agitator of particulate matter |
| CN204962158U (en) * | 2015-09-02 | 2016-01-13 | 云南锡业股份有限公司铜业分公司 | Fine coal pipeline filters and automatic clear stifled device |
| CN206720337U (en) * | 2017-03-15 | 2017-12-08 | 麦科威（昆山）机械有限公司 | A kind of close phase low speed flow air-transport system for plastic grain |
| CN208356378U (en) * | 2018-04-16 | 2019-01-11 | 江苏师范大学 | High-efficiency dust removal system in a kind of pneumatic carrier |
| CN208648151U (en) * | 2018-04-25 | 2019-03-26 | 中国建材国际工程集团有限公司 | A kind of pneumatic conveying feeding device for glass production line |
-
2019
- 2019-10-18 CN CN201910992885.0A patent/CN112677363A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH315304A (en) * | 1951-08-25 | 1956-08-15 | Mann & Hummel Filter | Separator for pneumatically conveyed granular material. |
| JP2014188403A (en) * | 2013-03-26 | 2014-10-06 | Kawata Mfg Co Ltd | Air stream agitator of particulate matter |
| CN103418195A (en) * | 2013-09-11 | 2013-12-04 | 湖南麓南脱硫脱硝科技有限公司 | Deashing and pre-dedusting device for SCR denitration system |
| CN204962158U (en) * | 2015-09-02 | 2016-01-13 | 云南锡业股份有限公司铜业分公司 | Fine coal pipeline filters and automatic clear stifled device |
| CN206720337U (en) * | 2017-03-15 | 2017-12-08 | 麦科威（昆山）机械有限公司 | A kind of close phase low speed flow air-transport system for plastic grain |
| CN208356378U (en) * | 2018-04-16 | 2019-01-11 | 江苏师范大学 | High-efficiency dust removal system in a kind of pneumatic carrier |
| CN208648151U (en) * | 2018-04-25 | 2019-03-26 | 中国建材国际工程集团有限公司 | A kind of pneumatic conveying feeding device for glass production line |
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