CN201586429U - Pressure rotary filter - Google Patents
Pressure rotary filter Download PDFInfo
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- CN201586429U CN201586429U CN 201020032982 CN201020032982U CN201586429U CN 201586429 U CN201586429 U CN 201586429U CN 201020032982 CN201020032982 CN 201020032982 CN 201020032982 U CN201020032982 U CN 201020032982U CN 201586429 U CN201586429 U CN 201586429U
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Abstract
The utility model relates to a pressure rotary filter, which mainly solves the problem of the prior art that large use amount of washing water causes high operation costs and large quantity of sewage treatment. The pressure rotary filter comprises a casing body and a drum; and the drum sequentially includes a filtering area, a washing area, a finished product drying area and an unloading area along the rotation direction of the pressure rotary filter, wherein the washing area is divided into at least two stages of subareas, thereby the technical scheme effectively solves the problem. The pressure rotary filter can be used for industrial production of recycling pure terephthalic acid.
Description
Technical field
The utility model relates to a kind of pressure and rotates through filter, and the special pressure that relates to a kind of p-phthalic acid of recovery rotates through filter.
Background technology
(Terephthalic Acid TA) can be used to the production multiple polymers to terephthalic acid (TPA), comprises ethylene glycol terephthalate (PET).Typical technology of producing PET is the polycondensation reaction of terephthalic acid (TPA) and polyalcohol.In order to make product satisfy market demands, this esterification need adopt the p-phthalic acid as raw material.
The industrial production of terephthalic acid (TPA) generally adopts paraxylene liquid phase oxidation technology, is raw material with paraxylene (PX) promptly, is that solvent carries out oxidation reaction generation terephthalic acid (TPA) (TA) with acetic acid.Be oxidized in the process of TA at PX, can produce accessory substance 4-carboxyl benzaldehyde (4-CBA).At present industrial disclosed as document US 3584039, generally adopting in aqueous environment the 4-CBA hydrogenation among the thick TA is the p-methylbenzoic acid (PT acid) that more is dissolved in water, and water washes then, removes the wherein dissolving PT acid of remnants.The flushing water that contains PT acid is recovered or gets back to treatment unit for waste water.When residual PT acid concentration is only smaller or equal to 200ppm among the p-phthalic acid after the processing, just can be used for direct polycondensation and produces polyester fiber.
In traditional PTA technological process, the product of refining workshop section separates employing two-stage separation scheme usually: Pressure Centrifuges and rotation vacuum filter.Be about to introduce Pressure Centrifuges, be separated into filter cake and the mother liquor of moisture content 18 weight % from the slurry of crystallizer; Filter cake enters the rotation vacuum filter after pulling an oar separates once more again; The filter cake that comes out from the rotation vacuum filter enters drying machine, obtains qualified PTA product after super-dry.This method not only needs to consume a large amount of deionized waters, and the equipment investment height.
Document US 5175355 and US6639104 disclose a kind of pressure and rotated through filter, and wherein rotary drum is divided into three zones: mother liquor removes district, solids wash district and solid discharge zone.The liquid slurry that contains terephthalic acid crystals and impurity is squeezed into the high-voltage rotary filter, filters slurry, collects the part solid.Water flushing solid.The solid that washed is admitted to depressor area, and its pressure is less than the pressure in solid collection zone.After solid was admitted to depressor area, depressor area was sealed with being connected of solid collection district, and like this, the variation of depressor area pressure can not influence the pressure of collecting region.The pressure of depressor area reduces gradually, and solid is removed.Depressor area pressure recovers then, and the solid from filter is accepted in preparation once more.It is still very big that this pressure rotates through filter flushing water consumption, handles PTA per ton and need use 200～700 kilograms of flushing waters.Industrial for guaranteeing product quality, fresh water generally adopts the more expensive deionized water of price, so cause operating cost higher.
Summary of the invention
Technical problem to be solved in the utility model is that the flushing water consumption is big in the prior art, causes operating cost height, problem that sewage load is big, provides a kind of new pressure to rotate through filter.These pressure rotating filter facility have the flushing water consumption few, and running cost is low, the characteristics that sewage load is few.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is as follows: a kind of pressure rotates through filter, comprises housing and rotary drum; Rotate through the rotation direction of filter along pressure, rotary drum comprises filtering area, scrubbing section, finished product dry section and discharge zone successively; Wherein, described scrubbing section is divided into two-stage subarea at least.
In the technique scheme, described scrubbing section preferred version is for being divided into 2 grades or 3 grades of subareas.When described washing subarea was 2 grades, the area in two-stage washing subarea was 0.25～4: 1 than preferable range, and more preferably scope is 0.5～2: 1.Containing the centre of the scrubbing section in two-stage subarea at least, preferred version is for also being provided with at least one middle dry section.
Pressure of the present utility model rotates through filter, and the outlet moisture percentage of middle dry section preferably is lower than the moisture percentage of finished product dry section, and wherein the moisture percentage of finished product dry section is 1～30 weight %, and preferable range is 5～15 weight %.In the use, the water after wash in back one-level washing subarea washs the flushing water in subarea more successively as the flushing water in previous stage washing subarea as previous stage after preferably merging with fresh water.
Because the quality of flushing water directly influences the quality of product P TA, generally need to adopt deionized water.Adopt the utility model, scrubbing section is divided at least two subareas, during use the water after the back scrubbing section washing being substituted fresh water recycles, rotating through filter with the pressure of single-stage washing compares, can make the flushing water consumption save 30%, reach the purpose that reduces running cost, reduces sewage load.In addition, rate of cake moisture content is remarkable to the influence of washings consumption.When moisture percentage was high, total impurities was also high, therefore needed more washings.The method of taking some to reduce rate of cake moisture content all can effectively reduce the consumption of washings.The utility model reduces the consumption of fresh washings with the reduction rate of cake moisture content by dry section in the middle of increasing.Behind the dry section, compare in the middle of in the middle of the two-stage scrubbing section, increasing by one, can make the flushing water consumption save 8% again, obtained better technical effect with the two-stage washing.
In addition, the utility model also is favourable to Machine Design.Because this technological requirement filtration, washing, drying and discharging are integrated in the machine, so having relatively high expectations to mechanical seal.When adopting the single-stage scrubbing section, if cleaning solution seepage occurs in mechanical seal place, the filtrate that has higher concentration PT acid directly enters dry section, thereby influences product quality.
Description of drawings
Fig. 1 is a flow chart of the present invention.
Among Fig. 1,1 is crystallizer, and 2 for containing the slurry of terephthalic acid crystals and impurity, 3 for pressure rotates through filter, and 4 is charging aperture, and 5 is filtering area, 6 is mother liquor, and 7 is mother liquor tank, and 8 is Waste Water Treatment, 10 is filter cake, and 11 is rotary drum, and 12 is scrubbing section, 13 are one-level washing subarea, and 14 is the one-level washings, and 15 is the secondary wash filtrate, 16 is fresh water, 17 is the one-level wash filtrate, and 18 is the cleaning solution recovery system, and 19 are secondary washing subarea, 20 is the secondary washings, 21 is the finished product dry section, and 22 is dry gas, and 23 are wet tail gas, 24 is discharge zone, and 25 are wet product.
Among Fig. 1, be transported in the rotary pressure filter 3 from the slurry that contains terephthalic acid crystals and impurity 2 of upstream crystallizer 1. Slurry enters filter press by charging aperture 4, at first removes mother liquor 6 at filtering area 5. The mother liquor that removes is delivered to mother liquor tank 7, removes Waste Water Treatment 8 again. Remove the filter cake 10 of most of mother liquor, along with rotary drum 11 rotates, entered scrubbing section 12. After filter cake enters one-level washing subarea 13, be that the hot water-one-level washings 14 of 4.5 bar washes with pressure. The pressure of one-level washings needs higher than cleaning solution recovery system 18 pressure, generally needs height at least 0.5 bar. The one-level washing is supplied water and is comprised of two parts: a part is to apply mechanically secondary wash filtrate 15, replenishes in addition a part of fresh water 16 again. Water temperature can be controlled at 70～160 ℃, preferred 125～150 ℃. Be circulated in the upstream crude terephthalic acid slurry 18 after one-level wash filtrate 17 is collected or enter Waste Water Treatment. Filter cake enters secondary washing subarea 19 after washing the subarea through one-level. The secondary washings 20 in secondary washing subarea all come from fresh water. For guaranteeing product quality, the industrial use deionized water that needs of so-called fresh water. Secondary washing row filtrate is collected, and behind the merging fresh water, as the one-level washings, is used for the one-level washing. Filter cake after the washing is sent into dry section 21. The dry method that generally can adopt hot nitrogen 22 to purge. Dried wet tail gas 23 emits. Dried filter cake enters discharge zone 24, present industrial two classes with pressure and not with pressure that have of discharge zone. No matter adopt which kind of form, the present invention can both have effect. The discharge zone wet product 25 that satisfies technological requirement is out sent into lower road drying process.
The pressure control of washing drainage system generally can by a collecting tank is set, arrange pressure-regulating valve at collecting tank and realize. This control belongs to known chemical industry control method.
The temperature of two-stage washings is controlled at 70～160 ℃, preferred 125～150 ℃. This is because if temperature is excessively low, after the decompression of washing draining recovery system, the PT acid that is dissolved in the water can be separated out, and damages pipeline, equipment. The control of temperature can realize by known control program. Continue drying district 21 dryings, discharge zone 22 dischargings through the PTA slurry after twice washing, then obtain to satisfy the wet product of PTA of technological requirement.
In the utility model, the scrubbing section preferred version is for being divided into 2 grades or 3 grades of subareas, and the area in washings at different levels subarea is that any ratio can satisfy requirement of the present invention. But the inventor finds that when the washing subarea was divided into 2 grades, the Area Ratio scope in two-stage washing subarea was 0.25～4: 1, and preferred 0.5～2: 1 o'clock, effect was best. Although in theory, scrubbing section is divided into more subarea and is of value to minimizing washings consumption; But this has relatively high expectations to device fabrication, and along with taken more scrubbing section area than the multi partition baffle plate, too much subregion is unnecessary. Industrial scrubbing section is divided into the secondary subarea just can significantly reduce the washings consumption.
Rate of cake moisture content is obvious on the impact of washings consumption. When moisture percentage was high, total impurities was also high, therefore needed more washings. The method of taking some to reduce rate of cake moisture content all can effectively reduce the consumption of washings. The utility model reduces the consumption of fresh washings to reduce rate of cake moisture content by dry section in the middle of increasing. If the two-stage washing, the inventive method is dry section in the middle of increasing by between one-level washing subarea and the secondary washing subarea preferably. Namely through after the one-level washing, dry at middle dry section first, remove partially liq after, enter again secondary washing subarea washing. If three grades of washings can be washed middle dry section of increase between subarea and the secondary washing subarea in one-level, perhaps between secondary washing subarea and three grades of washing subareas, increase a middle dry section; Also can be in the middle of three grades of washings respectively increase by one in the middle of the subareas dry section, i.e. dry section in the middle of arranging between one-level washing subarea and the secondary washing subarea, then dry section in the middle of arranging again between secondary washing subarea and the three grades of washing subareas.
Below by embodiment the utility model is further elaborated.
The specific embodiment
The slurry feed situation that contains terephthalic acid crystals and impurity from upstream crystallizer 1 is as shown in table 1:
Table 1
| Total mass flow rate | Kilogram/hour | 128000 |
| Terephthalic acid solid | Kilogram/hour | 51840 |
| Water | Kilogram/hour | 76160 |
| Contain solid filter | Weight % | 40.5 |
| P-methylbenzoic acid content | Mg/kg | 2000 |
| Temperature | ℃ | 130 |
| Pressure | Crust | 4 |
The operating condition of filter press: the pressure of each subregion depends on feed pressure, is controlled to be 4 crust, and mother liquor, cleaning solution and wet exhaust gas recovery system pressure are controlled at 3.5 crust, rotating speed 90U/ hour, 120～165 millimeters of filter cake thicknesses, 1.5 meters of rotary drum width.
[Comparative Examples 1]
Adopting pressure shown in Figure 1 to rotate through filter, is not subregion of scrubbing section, is to adopt one-level washing, one-level drying.Filter press is of a size of: 4.5 meters of filter areas
2, 1.5 meters of rotary drum width.It is 4 subregions that rotary drum is divided into, and is respectively filtering area, scrubbing section, finished product dry section and discharge zone.Filtering area accounts for 120 ° of rotary drum circumference, and other each subregions are 80 °.Wherein the area of each subregion is as follows:
| Filtering area | Scrubbing section | The finished product dry section | Discharge zone |
| 1.5 rice 2 | 1 meter 2 | 1 meter 2 | 1 meter 2 |
After slurry enters filter press, through 74057 kilograms/hour in the slurry that obtains containing solid filter 70 weight % behind the filtering area.Wash in scrubbing section earlier, the cleaning solution total amount is 18200 kilograms/hour, all is fresh water.Moisture percentage after the washing is 18-20%, and flow is 62208 kilograms/hour, and wherein water is 10366 kilograms/hour, 1.33 kilograms/hour of p-methylbenzoic acids (128ppm).After super-dry, moisture percentage 8-10%, flow are 55987 kilograms/hour, and wherein water is 4147 kilograms/hour, 0.53 kilogram/hour of p-methylbenzoic acid (128ppm).Moisture percentage and p-methylbenzoic acid content meet the demands.As seen, for satisfying the content requirement of moisture percentage and p-methylbenzoic acid, need 18200 kilograms/hour of fresh washings altogether.
[embodiment 1]
Adopt pressure shown in Figure 1 to rotate through filter, two-stage washing, one-level drying.Filter press is of a size of: 6 meter 2 of filter area, 1.5 meters of rotary drum width.Rotary drum is divided into 5 subregions, is respectively filtering area, one-level washing subarea, secondary washing subarea, finished product dry section, discharge zone.Filtering area accounts for 120 ° of rotary drum circumference, and other each subregions are 60 °.Wherein the area of each subregion is as follows:
| Filtering area | One-level washing subarea | Secondary washing subarea | The finished product dry section | Discharge zone |
| 2 meters 2 | 1 meter 2 | 1 meter 2 | 1 meter 2 | 1 meter 2 |
After slurry enters filter press, through 74057 kilograms/hour in the slurry that obtains containing solid filter 70 weight % behind the filtering area.Wash in one-level washing subarea earlier, the cleaning solution total amount is 14700 kilograms/hour, and wherein fresh water is 7300 kilograms/hour.Moisture percentage after the washing is 18-20%, and flow is 62208 kilograms/hour, and wherein water is 10364 kilograms/hour, 3.2 kilograms/hour of p-methylbenzoic acids.Enter secondary washing subarea washing again, 7400 kilograms/hour of the fresh washing water yields, the moisture percentage after the washing is 18-20 weight %, and flow is 62208 kilograms/hour, and wherein water is 10366 kilograms/hour, 1.34 kilograms/hour of p-methylbenzoic acids (129ppm).After super-dry, moisture percentage 8-10%, flow are 55987 kilograms/hour, and wherein water is 4147 kilograms/hour, 0.53 kilogram/hour of p-methylbenzoic acid (128ppm).Moisture percentage and toluic acid content satisfied the requirement that wet product enters follow-up dry workshop section (it is 5～15 weight % that moisture percentage requires, to the toluic acid content requirement less than 200ppm).Wherein the fresh water consumption is 14700 kilograms/hour altogether, saves fresh water 20% than the single-stage washing.
[embodiment 2]
Adopt pressure shown in Figure 1 to rotate through filter, two-stage washing, two-stage drying.Filter press is of a size of: 6 meter 2 of filter area, 1.5 meters of rotary drum width.Rotary drum is divided into 6 subregions, is respectively filtering area, one-level washing subarea, middle dry section, secondary washing subarea, finished product dry section and discharge zone.Filtering area accounts for 90 ° of rotary drum circumference, and other each subregions are 54 °.Wherein the area of each subregion is as follows:
| Filtering area | One-level washing subarea | Middle dry section | Secondary washing subarea | The finished product dry section | Discharge zone |
| 1.5 rice 2 | 0.9 rice 2 | 0.9 rice 2 | 0.9 rice 2 | 0.9 rice 2 | 0.9 rice 2 |
After slurry enters filter press, through 74057 kilograms/hour in the slurry that obtains containing solid filter 70 weight % behind the filtering area.Wash in one-level washing subarea earlier, the cleaning solution total amount is 9453 kilograms/hour, and wherein fresh water is 6600 kilograms/hour.Moisture percentage after the washing is 20%, and flow is 62208 kilograms/hour, and wherein water is 10364 kilograms/hour, 3.9 kilograms/hour of p-methylbenzoic acids.Dry section in the middle of entering then removes partially liq, is 10-14% through middle dry back moisture percentage, and flow is 58061 kilograms/hour, and wherein water is 6218 kilograms/hour, 2.4 kilograms/hour of p-methylbenzoic acids.Enter secondary washing subarea washing again, 7000 kilograms/hour of the fresh washing water yields, the moisture percentage after the washing is 18-20%, and flow is 62208 kilograms/hour, and wherein water is 10366 kilograms/hour, 1.3 kilograms/hour of p-methylbenzoic acids (128ppm).After super-dry, moisture percentage 8-10%, flow are 55987 kilograms/hour, and wherein water is 4147 kilograms/hour, 0.53 kilogram/hour of p-methylbenzoic acid (128ppm).Moisture percentage and p-methylbenzoic acid content meet the demands.Wherein the fresh water consumption is 13600 kilograms/hour altogether, saves fresh water 25% than the single-stage washing.
[Comparative Examples 2]
Adopt pressure shown in Figure 1 to rotate through filter, scrubbing section is divided into two subregions, but the cleaning solution of secondary scrubbing section is not circulated to the one-level scrubbing section, is the two-stage washing, the one-level drying, and cleaning solution is not applied mechanically.Filter press is of a size of: 6 meters of filter areas
2, 1.5 meters of rotary drum width.It is 5 subregions that rotary drum is divided into, and is respectively filtering area, one-level scrubbing section, secondary scrubbing section, finished product dry section and discharge zone.Filtering area accounts for 120 ° of rotary drum circumference, and other each subregions are 60 °.Wherein the area of each subregion is as follows:
| Filtering area | One-level washing subarea | Secondary washing subarea | The finished product dry section | Discharge zone |
| 2 meters 2 | 1 meter 2 | 1 meter 2 | 1 meter 2 | 1 meter 2 |
After slurry enters filter press, through 74057 kilograms/hour in the slurry that obtains containing solid filter 70 weight % behind the filtering area.Wash in one-level washing subarea earlier, the cleaning solution total amount is 9100 kilograms/hour, all is fresh water.Moisture percentage after the washing is 18-20%, and flow is 62208 kilograms/hour, and wherein water is 10364 kilograms/hour, 5.7 kilograms/hour of p-methylbenzoic acids.Entering secondary washing subarea washing again, all is fresh water, 9100 kilograms/hour of the washing water yields, moisture percentage after the washing is 18-20%, flow is 62208 kilograms/hour, and wherein water is 10366 kilograms/hour, 1.47 kilograms/hour of p-methylbenzoic acids (141ppm).After super-dry, moisture percentage 8-10%, flow are 55987 kilograms/hour, and wherein water is 4147 kilograms/hour, 0.58 kilogram/hour of p-methylbenzoic acid (141ppm).Though moisture percentage and p-methylbenzoic acid content meet the demands, water consumption is obviously than many (the needing 18200 kilograms/hour of fresh waters altogether) of applying mechanically cleaning solution.
[embodiment 3]
Adopt pressure shown in Figure 1 to rotate through filter, three grades of washings, one-level drying.Filter press rotary drum width is 1.5 meters.The filter press filter area is 7 meters
2Rotary drum divides 6 subregions, is respectively filtering area, one-level washing subarea, secondary washing subarea, three grades of washings subarea, finished product dry section and discharge zones.Wherein the area of each subregion is as follows:
| Filtering area | One-level washing subarea | Secondary washing subarea | Three grades of washing subareas | The finished product dry section | Discharge zone |
| 2 meters 2 | 1 meter 2 | 1 meter 2 | 1 meter 2 | 1 meter 2 | 1 meter 2 |
After slurry enters filter press, through 74057 kilograms/hour in the slurry that obtains containing solid filter 70 weight % behind the filtering area.Wash in one-level washing subarea earlier, the cleaning solution total amount is 12000 kilograms/hour, and wherein fresh water is 4000 kilograms/hour.Moisture percentage after the washing is 18-20%, and flow is 62208 kilograms/hour, and wherein water is 10364 kilograms/hour, 5.5 kilograms/hour of p-methylbenzoic acids.Enter secondary washing subarea washing again, the cleaning solution total amount is 8000 kilograms/hour, and wherein fresh water is 4000 kilograms/hour, moisture percentage after the washing is 18-20 weight %, flow is 62208 kilograms/hour, and wherein water is 10366 kilograms/hour, 2.1 kilograms/hour of p-methylbenzoic acids.Enter three grades of washing subarea washings then, the cleaning solution total amount is 4000 kilograms/hour, and wherein fresh water is 4000 kilograms/hour, moisture percentage after the washing is 18-20 weight %, flow is 62208 kilograms/hour, and wherein water is 10366 kilograms/hour, 1.34 kilograms/hour of p-methylbenzoic acids.After super-dry, moisture percentage 8-10%, flow are 55987 kilograms/hour, and wherein water is 4147 kilograms/hour, 0.53 kilogram/hour of p-methylbenzoic acid (128ppm).Moisture percentage and p-methylbenzoic acid content meet the demands, and fresh washings consumption is 12000 kilograms/hour altogether, save fresh water 35% than the single-stage washing.
Claims (5)
1. a pressure rotates through filter, comprises housing and rotary drum; Rotate through the rotation direction of filter along pressure, rotary drum comprises filtering area, scrubbing section, finished product dry section and discharge zone successively; Wherein, described scrubbing section is divided into two-stage subarea at least.
2. pressure according to claim 1 rotates through filter, it is characterized in that described scrubbing section is divided into 2 grades or 3 grades of subareas.
3. pressure according to claim 2 rotates through filter, and when it is characterized in that described washing subarea is 2 grades, the area ratio in two-stage washing subarea is 0.25～4: 1.
4. pressure according to claim 3 rotates through filter, and when it is characterized in that described washing subarea is 2 grades, the area ratio in two-stage washing subarea is 0.5～2: 1.
5. pressure according to claim 1 rotates through filter, it is characterized in that containing the centre of the scrubbing section in two-stage subarea at least, also is provided with at least one middle dry section.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020032982 CN201586429U (en) | 2010-01-13 | 2010-01-13 | Pressure rotary filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020032982 CN201586429U (en) | 2010-01-13 | 2010-01-13 | Pressure rotary filter |
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| CN201586429U true CN201586429U (en) | 2010-09-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728130A (en) * | 2012-07-16 | 2012-10-17 | 瓮福（集团）有限责任公司 | Water balance regulating method for filter |
| CN102814073A (en) * | 2012-09-02 | 2012-12-12 | 洛阳市豫瑞机械制造有限公司 | Horizontal disc filter applied in alkali making industry |
| CN104399299A (en) * | 2014-12-09 | 2015-03-11 | 中国矿业大学 | Process for recycling tail gas of pressure filtration machine in coal dressing process |
| TWI600461B (en) * | 2014-04-24 | 2017-10-01 | 英威達技術有限公司 | Filter for aromatic carboxylic acids |
| CN107875724A (en) * | 2017-12-27 | 2018-04-06 | 洛阳矿山机械工程设计研究院有限责任公司 | A kind of filter distribution head for Washing of Filter Cake |
-
2010
- 2010-01-13 CN CN 201020032982 patent/CN201586429U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728130A (en) * | 2012-07-16 | 2012-10-17 | 瓮福（集团）有限责任公司 | Water balance regulating method for filter |
| CN102814073A (en) * | 2012-09-02 | 2012-12-12 | 洛阳市豫瑞机械制造有限公司 | Horizontal disc filter applied in alkali making industry |
| TWI600461B (en) * | 2014-04-24 | 2017-10-01 | 英威達技術有限公司 | Filter for aromatic carboxylic acids |
| CN104399299A (en) * | 2014-12-09 | 2015-03-11 | 中国矿业大学 | Process for recycling tail gas of pressure filtration machine in coal dressing process |
| CN104399299B (en) * | 2014-12-09 | 2015-10-28 | 中国矿业大学 | Pressure filtration tail gas recycling technique in a kind of coal separation process |
| CN107875724A (en) * | 2017-12-27 | 2018-04-06 | 洛阳矿山机械工程设计研究院有限责任公司 | A kind of filter distribution head for Washing of Filter Cake |
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| C14 | Grant of patent or utility model | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Patentee after: Sinopec Corp. Patentee after: SINOPEC Shanghai Engineering Company Limited Address before: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Patentee before: Sinopec Corp. Patentee before: Sinopec Shanghai Engineering Co., Ltd. |
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| CX01 | Expiry of patent term | ||
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Granted publication date: 20100922 |