CN111318454A - Method for filtering particle impurities in dilute-phase pneumatic conveying crude terephthalic acid product - Google Patents
Method for filtering particle impurities in dilute-phase pneumatic conveying crude terephthalic acid product Download PDFInfo
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- CN111318454A CN111318454A CN201811525131.6A CN201811525131A CN111318454A CN 111318454 A CN111318454 A CN 111318454A CN 201811525131 A CN201811525131 A CN 201811525131A CN 111318454 A CN111318454 A CN 111318454A
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- pipeline
- filter
- dilute
- terephthalic acid
- pneumatic conveying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
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Abstract
The invention provides a method for filtering particle impurities in a dilute-phase pneumatic conveying crude terephthalic acid product. The invention is that a pipeline filter is additionally arranged on a dilute phase pneumatic conveying pipeline of Crude Terephthalic Acid (CTA); meanwhile, the conveying air pressure is controlled to be 0.05-0.15 MPa; the filtration pressure difference is controlled to be 0.01 to 5 KPa. The method can remove more than 95 percent of particle impurities in the CTA product, stabilize the stable operation of subsequent devices, prolong the service life of the palladium-carbon catalyst, and simultaneously, the pipeline filter is static equipment, so the operation and maintenance cost is low and the impurity removal rate is high.
Description
Technical Field
The invention belongs to the field of terephthalic acid production, and particularly relates to a method for filtering particle impurities in a dilute-phase pneumatic conveying crude terephthalic acid product.
Background
In the production process of Crude Terephthalic Acid (CTA) by oxidizing paraxylene, part of by-products, intermediate products or sodium salts can form blocky particles into products, and part of equipment accessories such as fillers, sealing rings or small parts can also be entrained into the products to form particle impurities. Particulate impurities can affect the proper operation of downstream equipment and palladium on carbon catalysts, etc.
In the prior art, a method for removing particle impurities carried by powdery materials is to add a vibrating screen above a conveying target bin to remove the particle impurities. The vibrating screen is a movable device, so that the vibrating screen is poor in operation stability, easy to block, high in maintenance cost and high in operation cost.
Disclosure of Invention
Aiming at the problems, the invention provides a method for filtering particle impurities in a dilute-phase pneumatic conveying crude terephthalic acid product, wherein a pipeline filter is additionally arranged on a dilute-phase pneumatic conveying pipeline of Crude Terephthalic Acid (CTA), and the principle of the pipeline filter is that the diameter of a filter mesh of the pipeline filter is smaller than that of particle impurities carried in a powdery material, so that the particle impurities can be intercepted. The original method for removing the particle impurities carried by the powdery materials is to add a vibrating screen above a conveying target bin to remove the particle impurities. The vibrating screen is movable equipment, the pipeline filter is static equipment, the running stability of the vibrating screen is poorer than that of the pipeline filter, the impurity removal rate of the pipeline filter is obviously improved for a continuous production running device, and the static equipment is low in maintenance cost and running cost.
The method for filtering particle impurities in the dilute-phase pneumatic conveying crude terephthalic acid product is characterized in that a pipeline filter is additionally arranged on a dilute-phase pneumatic conveying pipeline of Crude Terephthalic Acid (CTA); meanwhile, the conveying gas pressure is 0.05-0.15 MPa; the filtration pressure difference is 0.01 to 5 KPa.
According to the characteristics of corrosion, conveying resistance, impurity content and the like of a CTA dilute-phase pneumatic conveying pipeline, the pipeline filter selects a proper filter screen: the shape of the meshes of the filter screen is not limited; the longest axis of the mesh of the filter screen is 0.5-1 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 is supported by the single-side crossed stainless steel bars, so that the strength is high.
The method of the invention has the following advantages:
(1) the present invention adds a pipeline filter on the CTA dilute phase pneumatic conveying pipeline, and can remove more than 95% of particle impurities in the CTA product by proper control.
(2) The method can ensure the stable operation of the subsequent device and prolong the service life of the palladium-carbon catalyst.
(3) The pipeline filter is static equipment, the operation and maintenance cost is low, and the impurity removal rate is high.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. 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.
Example 1
In the embodiment, a pipeline filter is additionally arranged on a dilute phase pneumatic conveying pipeline of Crude Terephthalic Acid (CTA); the longest axis of a mesh of a filter screen in the pipeline filter is 0.5cm, the angle between the installation direction of the filter screen and the flowing direction of fluid in the pipeline is 70 degrees, the filter screen is made of stainless steel, and the filter screen is supported by a single-side crossed stainless steel strip. Meanwhile, the conveying gas pressure is 0.05 MPa; the filtration pressure difference was 0.01 KPa. The experimental results show that: the removal rate of particulate impurities in the CTA product after filtration was 95.1%.
Example 2
In the embodiment, a pipeline filter is additionally arranged on a dilute phase pneumatic conveying pipeline of Crude Terephthalic Acid (CTA); the longest axis of a mesh of a filter screen in the pipeline filter is 1cm, the angle between the installation direction of the filter screen and the flowing direction of fluid in the pipeline is 85 degrees, the filter screen is made of stainless steel, and the filter screen is supported by a single-side crossed stainless steel strip. Meanwhile, the conveying gas pressure is 0.15 MPa; the filtration pressure difference was 5 KPa. The experimental results show that: the removal rate of particulate impurities in the CTA product after filtration was 95.6%.
Example 3
In the embodiment, a pipeline filter is additionally arranged on a dilute phase pneumatic conveying pipeline of Crude Terephthalic Acid (CTA); the longest axis of a mesh of a filter screen in the pipeline filter is 0.6cm, the angle between the installation direction of the filter screen and the flowing direction of fluid in the pipeline is 75 degrees, the filter screen is made of stainless steel, and the filter screen is supported by a single-side crossed stainless steel strip. Meanwhile, the conveying gas pressure is 0.10 MPa; the filtration pressure difference was 0.1 KPa. The experimental results show that: the removal rate of particulate impurities in the CTA product after filtration was 96.8%.
Example 4
In the embodiment, a pipeline filter is additionally arranged on a dilute phase pneumatic conveying pipeline of Crude Terephthalic Acid (CTA); the longest axis of a mesh of a filter screen in the pipeline filter is 0.8cm, the angle between the installation direction of the filter screen and the flowing direction of fluid in the pipeline is 78 degrees, the filter screen is made of stainless steel, and the filter screen is supported by a single-side crossed stainless steel strip. Meanwhile, the conveying gas pressure is 0.12 MPa; the filtration pressure difference was 1 KPa. The experimental results show that: the removal rate of particulate impurities in the CTA product after filtration was 97.3%.
It can be seen from the above examples that the method of the present invention can be used to remove more than 95% of particulate impurities in CTA product by adding a pipeline filter to the CTA dilute phase pneumatic conveying pipeline and by proper control. And the method of adding the vibrating screen in the prior art is adopted, so that the removal rate of particle impurities is only 50-60%.
Claims (5)
1. A method for filtering particle impurities in a dilute-phase pneumatic conveying crude terephthalic acid product is characterized in that a pipeline filter is additionally arranged on a dilute-phase pneumatic conveying pipeline of Crude Terephthalic Acid (CTA); meanwhile, the conveying gas pressure is 0.05-0.15 MPa; the filtration pressure difference is 0.01 to 5 KPa.
2. The method of claim 1, wherein the longest axis of the mesh of the filter screen in the pipeline filter is 0.5-1 cm.
3. The method of claim 1, wherein the filter screen of the pipeline filter is disposed at an angle of 70-85 ° with respect to the direction of fluid flow in the pipeline.
4. The method of claim 1 wherein the filter screen of the pipeline filter is made of stainless steel.
5. The method of claim 1 wherein the filter screen of the duct filter is supported by cross-lined stainless steel strips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811525131.6A CN111318454A (en) | 2018-12-13 | 2018-12-13 | Method for filtering particle impurities in dilute-phase pneumatic conveying crude terephthalic acid product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811525131.6A CN111318454A (en) | 2018-12-13 | 2018-12-13 | Method for filtering particle impurities in dilute-phase pneumatic conveying crude terephthalic acid product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111318454A true CN111318454A (en) | 2020-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811525131.6A Pending CN111318454A (en) | 2018-12-13 | 2018-12-13 | Method for filtering particle impurities in dilute-phase pneumatic conveying crude terephthalic acid product |
Country Status (1)
| Country | Link |
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| CN (1) | CN111318454A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1414882A (en) * | 1972-09-12 | 1975-11-19 | Fazer Ab Oy Karl | Screen device for pneumatic transport equipment |
| DD282073A5 (en) * | 1988-03-02 | 1990-08-29 | Rheinische Braunkohlenw Ag | DEVICE FOR PREPARING SAMPLES FROM A SCHUETTGUTSTROM |
| CN103466327A (en) * | 2013-08-14 | 2013-12-25 | 山东亿泰农牧科技发展有限公司 | Grain elevator for warehouse |
| CN103495556A (en) * | 2013-09-26 | 2014-01-08 | 都江堰申都中药有限公司 | Separation device for mixed medicine particles |
| 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 |
-
2018
- 2018-12-13 CN CN201811525131.6A patent/CN111318454A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1414882A (en) * | 1972-09-12 | 1975-11-19 | Fazer Ab Oy Karl | Screen device for pneumatic transport equipment |
| DD282073A5 (en) * | 1988-03-02 | 1990-08-29 | Rheinische Braunkohlenw Ag | DEVICE FOR PREPARING SAMPLES FROM A SCHUETTGUTSTROM |
| CN103466327A (en) * | 2013-08-14 | 2013-12-25 | 山东亿泰农牧科技发展有限公司 | Grain elevator for warehouse |
| CN103495556A (en) * | 2013-09-26 | 2014-01-08 | 都江堰申都中药有限公司 | Separation device for mixed medicine particles |
| 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 |
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Application publication date: 20200623 |
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| RJ01 | Rejection of invention patent application after publication |