CN106315891B - Dephenolizing method and dephenolizing device for phenol-containing wastewater generated in phenol refining - Google Patents
Dephenolizing method and dephenolizing device for phenol-containing wastewater generated in phenol refining Download PDFInfo
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Abstract
The invention provides a dephenolizing method and a dephenolizing device for phenol-containing wastewater generated by phenol refining. Dephenolized light oil of the existing light oil cleaning process is used as an extracting agent to be extracted and dephenolized with the phenol-containing wastewater, the extracted rich oil is returned to a light oil cleaning tower to be subjected to back extraction, the sodium phenolate is recovered by utilizing the reaction of free alkali in the alkaline sodium phenolate and phenol in the rich oil, and the dephenolized wastewater is sent to a coal gas purification wastewater treatment system. The method has the advantages of compactness, simplicity, low equipment investment cost, no auxiliary material consumption, high cyclic utilization rate of the waste water dephenolizing extraction agent, high waste water dephenolizing and deoiling rate, contribution to improving the quality of the sodium phenolate in the fraction dephenolizing device, reduction of the consumption of sulfuric acid in the phenolate decomposition device and the like.
Description
Technical field
The invention belongs to the industrial treatment technical fields of coal chemical industry phenol wastewater, and in particular to a kind of phenol treating high concentration contains
The dephenolization method and device of phenol waste water
Background technique
From the phenol treating production technology for extracting crude phenols in coal tar, a large amount of high-concentration phenolic wastewater, phenol can be generated
It is high toxicity and organic matter difficult to degrade in the waste water, phenol wastewater will generate subsequent biochemical sludge production process biggish
It influences.There are many prior art of phenol treating wastewater treatment, and close technology is Chinese invention patent with present patent application
" Coal Tar Wastewater processing method and system " (101875523 A of application publication number CN), technical characteristic is 1) remove waste water
Free oil and oil emulsion, 2) dephenolize of N-503 extractant is used, 3) extraction phase containing phenol is stripped using NaOH, respectively
Recycling extractant and phenates, 4) removing sulfide." Coal Tar Wastewater processing method and system " is made in extraction process using N-503
For extractant, use NaOH as strippant in back extraction process.A kind of Chinese invention patent " coal chemical industry phenol wastewater extraction
The method of dephenolize " (102336451 A of application publication number CN), technical characteristic is 1) extract using based on methyl- tert the eleventh of the twelve Earthly Branches base ether
Take agent, 2) the method recycling design and crude phenols of rectifying are used.
Above-mentioned document and drawback of the prior art is that, extraction be stripped process used in N-503, NaOH be non-
The byproduct of coal tar production process needs outsourcing, and consumption is larger, and according to measuring and calculating, 1000 kilograms of crude phenols needs of every recycling disappear
2000 kilograms of NaOH solution of consumption consumes 44 kilograms of N-503 solution.Thus it can estimate, the phenol treating of a set of 4000kg/h is useless containing phenol
Water process needs to occur every year N-503 and 1,620,000 yuan of NaOH solution purchase commodity, higher cost.
Summary of the invention
In order to solve the problems, such as that existing phenol treating phenol wastewater dephenolize technical costs is high, the purpose of the present invention is to provide
A kind of dephenolization method and device of the phenol wastewater that phenol treating generates propose a kind of phenol essence without separately purchasing chemical industry auxiliary material
Phenolic wastewater treatment method processed.
Technical scheme is as follows:
A kind of dephenolization method for the phenol wastewater that phenol treating generates, which comprises the steps of:
(1) the phenol wastewater extracting and dephenolizing that phenol treating generates:
Phenol treating phenol wastewater and dephenolize light oil are mixed into static mixer, are sufficiently mixed two kinds of fluids, enter back into
Oil water separator is stood, and forms rich oil and dephenolize waste water, and the obtained dephenolize waste water is exported under oil water separator enters coal
Gas purifies waste water treatment system；
(2) rich oil is stripped dephenolize:
It is extracted out by the rich oil that step (1) obtains from the top of the oil water separator, the lower entrances through light oil washing column
Into light oil washing column；
The alkaline sodium phenolate sent by naphtalene oil dephenolize device, the upper entrance through light oil washing column enter light oil washing column；
In light oil washing column, the alkaline sodium phenolate and the rich oil counter current contacting from bottom to top, make from top to bottom
Phenol in rich oil is stripped by alkaline sodium phenolate to be removed, and dephenolize light oil and neutral sodium phenolate are obtained, and the dephenolize light oil enters step
Suddenly static mixer described in (1), is recycled；The neutrality sodium phenolate enters the phenol salt de device of next procedure.
The dephenolization method for the phenol wastewater that the phenol treating generates according to the present invention, it is preferred that in the step (1)
Settle and separate in oil water separator, the temperature of oil water separator are 50-60 DEG C.
The dephenolization method for the phenol wastewater that the phenol treating generates according to the present invention, it is preferred that in the step (2)
Obtained dephenolize light oil enters static mixer after subcooler.
The dephenolization method for the phenol wastewater that the phenol treating generates according to the present invention, it is preferred that the phenol treating contains phenol
Waste water come from phenol treating process, the phenol treating phenol wastewater 10000~20000mg/L of concentration containing phenol, oil concentration 3000~
5000mg/L.Further, phenol treating phenol wastewater concentration containing phenol 13500mg/L, oil concentration 3300mg/L.
The dephenolization method for the phenol wastewater that the phenol treating generates according to the present invention, it is preferred that the phenol treating contains phenol
3000~5000kg/h of influent waste water amount.Further, the phenol treating phenol wastewater inflow 4000kg/h.
The dephenolization method for the phenol wastewater that the phenol treating generates according to the present invention, it is preferred that in the step (1)
1:1~3:1, more preferable 1:1 enter static mixer to the phenol treating phenol wastewater by volume with dephenolize light oil.
The dephenolization method for the phenol wastewater that the phenol treating generates according to the present invention, it is preferred that in the step (2)
The flow 4000Kg/h of alkaline sodium phenolate, free alkali 2~4%, further preferred free alkali 4%.
The dephenolization method for the phenol wastewater that the phenol treating generates according to the present invention, it is preferred that in the step (2)
In light oil washing column, alkaline sodium phenolate and rich oil 1:1~2:1, further preferred 1:1 by volume.
The present invention also provides a kind of device of the dephenolization method of phenol wastewater generated using the phenol treating, feature exists
In the dephenolize device includes static mixer 1, and the static mixer 1 is connect by pipeline with oil water separator 2, in institute
Oil rich outlet is arranged on the top of the oil water separator 2 in the bottom setting dephenolize wastewater outlet for stating oil water separator 2, described
Oil rich outlet is connect by pipeline with light oil washing column 5, is arranged on the pipeline between the oil rich outlet and light oil washing column 5
Rich oil pump 3, the top of the light oil washing column 5 is connect by light oil circulating pump 7 with cooler 6, the cooler 6 again with it is described
Static mixer 1 connects, and neutral sodium phenolate outlet is arranged in the bottom of the light oil washing column 5.
According to the dephenolize device for the phenol wastewater that the phenol treating generates, further, the dephenolize wastewater outlet passes through pipe
Road is connect with waste water pump 4.
The present patent application 1) using dephenolize light oil as extractant to phenol wastewater dephenolize, 2) using alkalinity sodium phenolate conduct
Strippant is stripped rich oil extracted, recycles dephenolize light oil extractant, and obtain neutral phenates.
It is an object of the present invention to which existing phenol treating phenol wastewater dephenolize technology is overcome to need lacking for another purchase chemical industry auxiliary material
It falls into, proposes a kind of phenol treating phenolic wastewater treatment method without separately purchasing chemical industry auxiliary material.
The technical solution of the present patent application are as follows:
1) using the dephenolize light oil of coal chemical industry enterprises normal process steps-fraction dephenolizing device light oil washing column institute output as
Extractant, to phenol treating phenol wastewater extracting and dephenolizing.After waste water extracting and dephenolizing, it will generate two kinds of objects of dephenolize waste water and rich oil
Matter.Wherein, dephenolize waste water is sent to next procedure gas purification remained ammonia processing system, and rich oil then send light to fraction dephenolizing device
Oily washing column entrance, the makeup oil as fraction dephenolizing device.
2) using the alkaline sodium phenolate of fraction dephenolizing device previous process naphtalene oil dephenolize device institute output as strippant,
Dephenolize is stripped to rich oil.After rich oil is stripped dephenolize, it will generate two kinds of substances of dephenolize light oil and neutral sodium phenolate.Wherein,
Dephenolize light oil is sent to phenol treating phenol wastewater extracting and dephenolizing process, and as removing phenol in waste water extractant, neutral sodium phenolate is then sent under
Procedure phenol salt de device.
Beneficial effect
The present invention provides the dephenolization method and device of a kind of phenol wastewater that phenol treating generates:
(1) it does not need separately to purchase and process raw material.
(2) in the case that do not occur separately purchase process raw material, since coal chemical industry enterprises usual means-are utilized in the present patent application
Extractant of the dephenolize light oil of fraction dephenolizing device output as removing phenol in waste water, so there is no need to extractant slot and its attached is separately arranged
Facility.
(3) in the case that do not occur separately purchase process raw material, since coal chemical industry enterprises usual means-are utilized in the present patent application
For fraction dephenolizing device light oil washing column as rich oil stripping cells, so there is no need to reextractor and its affiliated facility is separately arranged.
(4) in the case that do not occur separately purchase process raw material, since the phenol wastewater phenol removal process of the present patent application is used
Dephenolize light oil there are very strong separating phenols substance characteristics, therefore the concentration containing phenol of phenol wastewater can be made by extracting preceding 13500-
17000mg/L is reduced to 1350-2550mg/L, and dephenolize efficiency is up to 83-91%, and the waste water after dephenolize can be fed directly to lower road work
Sequence-gas purification remained ammonia processing system.
(5) in the case that do not occur separately purchase process raw material, as the present patent application rich oil be stripped process used by
Alkaline sodium phenolate has the characteristic of very strong removing phenolic substances, and the amount containing phenol of rich oil can be made by 3.2% decline before being stripped
It is 1.4%, this amount containing phenol is also lower than 1.8% amount containing phenol of dephenolize light oil, to fully reduce the dephenolize extraction of phenol wastewater
Take agent.
(6) in the case that do not occur separately to purchase process raw material, since the rich oil back extraction process of the present patent application has been used and has been evaporated
Divide dephenolize device alkaline phenol sodium to be treated as strippant, the method, it will help the production of fraction dephenolizing device is imitated
Rate can promote the free alkali content of the alkaline sodium phenolate of fraction dephenolizing device to be reduced to by 2-4% 2% hereinafter, alkaline sodium phenolate
After free alkali content reduces, it is beneficial to improve sodium phenolate quality, and reduce its next procedure-phenol salt de device sulfuric acid and disappear
Consumption.
(7) there is device compact, equipment investment expense is arranged for a kind of phenol treating phenol wastewater dephenolization method and device
It is low, high without supplementary product onsumption, removing phenol in waste water extractant cyclic utilization rate height, removing phenol in waste water oil removal rate, and it is de- to help to improve fraction
The advantages that phenol device sodium phenolate quality, reduction phenol salt de device sulfuric acid consumption.
Detailed description of the invention:
Fig. 1: phenol treating phenol wastewater dephenolize device flow chart provided by the invention.
Fig. 2: " Coal Tar Wastewater processing method and system " process flow chart in the prior art.
In figure: 1 static mixer, 2 oil water separators, 3 rich oils pump, 4 waste water pumps, 5 light oil washing columns, 6 coolers, 7 are gently
Oil circulating pump.
Specific embodiment
For a better understanding of the present invention, below with reference to the embodiment content that the present invention is furture elucidated, but it is of the invention
Content is not limited solely to the following examples.
Embodiment 1
Such as attached drawing, a kind of phenol treating phenol wastewater dephenolization method process flow chart, a kind of phenol treating phenol wastewater is de-
The process of phenol method, one are phenol treating phenol wastewater extracting and dephenolizing, secondly being, rich oil is stripped dephenolize.The phenol treating contains
Phenol waste water extracting and dephenolizing process is realized by static mixer 1, oil water separator 2, rich oil pump 3,4 equipment of waste water pump；The rich oil
Process is stripped to be realized by light oil washing column 5, cooler 6,7 equipment of light oil circulating pump.
A kind of dephenolization method for the phenol wastewater that phenol treating generates, includes the following steps:
(1) the phenol treating phenol wastewater extracting and dephenolizing process realizes that process is the phenol treating sent by phenol treating process
The dephenolize that phenol wastewater (water 4000kg/h, concentration containing phenol 13500mg/L, oil concentration 3300mg/L) and cooler 6 are sent
Light oil (amount containing phenol 2.0%) is sent after converging at 1 left side 8 of static mixer to static mixer 1, quiet by 1:1 volume ratio
In state mixer 1, by means of the rotary mixed cell of static mixer 1, obtain two kinds of fluids of dephenolize light oil and phenol wastewater
To sufficient dispersion and mixing.By two kinds of fluid dispersions with mix, make the phenol in dephenolize light oil extraction phenol wastewater, dephenolize is light
After oil extraction, the concentration containing phenol of waste water will be reduced to 2300mg/L by 13500mg/L.Oily waste water after dephenolize is sent to grease point
From device 2, settle and separate is carried out in oil water separator 2, the temperature controlling range of oil water separator is (50-60) DEG C, using this
Temperature controlling range be in view of, when reaction temperature is at (50-60) DEG C, rich oil and dephenolize waste water can be made to obtain good separation,
And emulsion is not generated, by settle and separate, form rich oil and dephenolize waste water, wherein rich oil is by rich oil pump 3 by water-oil separating
The extraction of 2 top of device is sent to 5 lower entrances of light oil washing column, and dephenolize waste water is sent by waste water pump 4 to next procedure-gas purification
Waste water treatment system.
(2) the rich oil back extraction phenol removal process realizes that process is the alkaline sodium phenolate (stream sent by naphtalene oil dephenolize device
Measure 4000Kg/h, free alkali 4%) it is sent into 5 upper entrance of light oil washing column, in light oil washing column 5, alkaline phenol sodium from top to bottom
Salt passes through alkaline sodium phenolate and rich oil containing phenol by 1:1 volume ratio counter current contacting with rich oil (amount containing phenol 3.2%) from bottom to top
Counter current contacting is stripped the phenol in rich oil by alkaline sodium phenolate and removes, thus output dephenolize light oil and neutral sodium phenolate,
In, it is sent by light oil circulating pump 7 to cooler 6 by the dephenolize light oil (amount containing phenol 1.4%) of 5 top output of light oil washing column,
In cooler 6, dephenolize light oil is cooled to (50-60 DEG C) by (60-70) DEG C, and by dephenolize, gently oil cooled purpose is in view of light
Phenol and alkali reaction meeting exotherm, cooling later dephenolize light oil send to static mixer 1, contain as phenol treating in oily washing column
The extractant of phenol removing phenol in waste water is achieved in the recycling of dephenolize light oil.By the neutral phenol sodium of 5 lower part output of light oil washing column
Salt (below free alkali 2%) is sent to next procedure-phenol salt de device.What 5 lower part of light oil washing column was sent into is filled by tar distillation
The supplement light oil set, ingredient is similar to rich oil, the rich oil amount for balanced recycle reaction；7 road Song Zhixia work of light oil circulating pump
Sequence-benzol hydro refining unit dephenolize light oil is the dephenolize light oil amount for balancing weighing apparatus circular response.
Embodiment 2
The dephenolization method for the phenol wastewater that phenol treating provided by the invention generates, including static mixer 1, it is described static mixed
Clutch 1 is connect by pipeline with oil water separator 2, dephenolize wastewater outlet is arranged in the bottom of oil water separator 2, in water-oil separating
Oil rich outlet is arranged in the top of device 2, and oil rich outlet is connect by pipeline with light oil washing column 5, cleans in oil rich outlet and light oil
Rich oil is set on the pipeline between tower 5 and pumps 3, the top of light oil washing column 5 is connect by light oil circulating pump 7 with cooler 6, cooling
Device 6 is connect with the static mixer 1 again, and neutral sodium phenolate outlet is arranged in the bottom of light oil washing column 5；Dephenolize wastewater outlet
It is connect by pipeline with waste water pump 4.
A kind of dephenolization method for the phenol wastewater that phenol treating generates, includes the following steps:
(1) the phenol treating phenol wastewater extracting and dephenolizing process realizes that process is the phenol treating sent by phenol treating process
The dephenolize that phenol wastewater (water 3500kg/h, concentration containing phenol 16500mg/L, oil concentration 4300mg/L) and cooler 6 are sent
Light oil (amount containing phenol 2.0%) is sent after converging at 1 left side 8 of static mixer to static mixer 1, quiet by 2:1 volume ratio
In state mixer 1, by means of the rotary mixed cell of static mixer 1, obtain two kinds of fluids of dephenolize light oil and phenol wastewater
To sufficient dispersion and mixing.By two kinds of fluid dispersions with mix, make the phenol in dephenolize light oil extraction phenol wastewater, dephenolize is light
After oil extraction, the concentration containing phenol of waste water will be reduced to 2300mg/L by 16500mg/L.Oily waste water after dephenolize is sent to grease point
From device 2, settle and separate is carried out in oil water separator 2, the temperature controlling range of oil water separator is (50-60) DEG C, using this
Temperature controlling range be in view of, when reaction temperature is at (50-60) DEG C, rich oil and dephenolize waste water can be made to obtain good separation,
And emulsion is not generated, by settle and separate, form rich oil and dephenolize waste water, wherein rich oil is by rich oil pump 3 by water-oil separating
The extraction of 2 top of device is sent to 5 lower entrances of light oil washing column, and dephenolize waste water is sent by waste water pump 4 to next procedure-gas purification
Waste water treatment system.
(2) the rich oil back extraction phenol removal process realizes that process is the alkaline sodium phenolate (stream sent by naphtalene oil dephenolize device
Measure 4200Kg/h, free alkali 3%) it is sent into 5 upper entrance of light oil washing column, in light oil washing column 5, alkaline phenol sodium from top to bottom
Salt and rich oil (amount containing phenol 3.2%) from bottom to top, by 1.5:1 volume ratio counter current contacting, by alkaline sodium phenolate and containing phenol richness
Oily counter current contacting is stripped the phenol in rich oil by alkaline sodium phenolate and removes, thus output dephenolize light oil and neutral sodium phenolate,
In, it is sent by light oil circulating pump 7 to cooler 6 by the dephenolize light oil (amount containing phenol 1.4%) of 5 top output of light oil washing column,
In cooler 6, dephenolize light oil is cooled to (50-60 DEG C) by (60-70) DEG C, and by dephenolize, gently oil cooled purpose is in view of light
Phenol and alkali reaction meeting exotherm, cooling later dephenolize light oil send to static mixer 1, contain as phenol treating in oily washing column
The extractant of phenol removing phenol in waste water is achieved in the recycling of dephenolize light oil.By the neutral phenol sodium of 5 lower part output of light oil washing column
Salt (below free alkali 2%) is sent to next procedure-phenol salt de device.What 5 lower part of light oil washing column was sent into is filled by tar distillation
The supplement light oil set, ingredient is similar to rich oil, the rich oil amount for balanced recycle reaction；7 road Song Zhixia work of light oil circulating pump
Sequence-benzol hydro refining unit dephenolize light oil is the dephenolize light oil amount for balancing weighing apparatus circular response.
The present invention carries out phenol treating high-concentration phenolic wastewater using the dephenolize light oil of fraction dephenolizing device light oil washing column
Extracting and dephenolizing, rich oil extracted return again to light oil washing column, using the free alkali in alkaline sodium phenolate, to the phenol in rich oil into
To recycle sodium phenolate, the oil-poor of generation send extraction cells to recycle for row back extraction, with equipment investment expense is low, disappears without auxiliary material
The advantages that consuming, removing phenol in waste water extractant cyclic utilization rate height, removing phenol in waste water oil removal rate height, and helping to improve sodium phenolate quality,
It can be widely applied to the processing of coking high-concentration phenolic wastewater.
Claims (10)
1. a kind of dephenolization method for the phenol wastewater that phenol treating generates, which comprises the steps of:
(1) the phenol wastewater extracting and dephenolizing that phenol treating generates:
The phenol wastewater and dephenolize light oil that phenol treating generates are mixed into static mixer, are sufficiently mixed two kinds of fluids, then into
Enter oil water separator, stand, forms rich oil and dephenolize waste water, the obtained dephenolize waste water export entrance under oil water separator
Gas purification waste water treatment system；
(2) rich oil is stripped dephenolize:
It is extracted out by the rich oil that step (1) obtains from the top of the oil water separator, the lower entrances through light oil washing column enter
Light oil washing column；
The alkaline sodium phenolate sent by naphtalene oil dephenolize device, the upper entrance through light oil washing column enter light oil washing column；
In light oil washing column, the top-down alkaline sodium phenolate and the rich oil counter current contacting from bottom to top make richness
Phenol in oil is stripped by alkaline sodium phenolate to be removed, and dephenolize light oil and neutral sodium phenolate are obtained, and the dephenolize light oil enters step
(1) static mixer described in, is recycled；The neutrality sodium phenolate enters the phenol salt de device of next procedure.
2. the dephenolization method for the phenol wastewater that phenol treating generates according to claim 1, which is characterized in that in the step
(1) settle and separate in oil water separator in, the temperature of oil water separator are 50-60 DEG C.
3. the dephenolization method for the phenol wastewater that phenol treating generates according to claim 1, which is characterized in that in the step
(2) dephenolize light oil obtained in enters static mixer after subcooler.
4. the dephenolization method for the phenol wastewater that phenol treating generates according to claim 1, which is characterized in that the phenol treating produces
Raw phenol wastewater comes from phenol treating process, and the phenol treating phenol wastewater 10000~20000mg/L of concentration containing phenol, oil-containing is dense
Spend 3000~5000mg/L.
5. the dephenolization method for the phenol wastewater that phenol treating generates according to claim 1, which is characterized in that the phenol treating produces
Raw 3000~5000kg/h of phenol wastewater inflow.
6. the dephenolization method for the phenol wastewater that phenol treating generates according to claim 1, which is characterized in that in the step
(1) 1:1~3:1 enters static mixer to the phenol wastewater that phenol treating described in generates by volume with dephenolize light oil.
7. the dephenolization method for the phenol wastewater that phenol treating generates according to claim 1, which is characterized in that in the step
(2) free alkali 2~4% of neutral and alkali sodium phenolate.
8. the dephenolization method for the phenol wastewater that phenol treating generates according to claim 1, which is characterized in that in the step
(2) in light oil washing column, volume ratio 1:1~2:1 of alkaline sodium phenolate and rich oil.
9. a kind of device of the dephenolization method of the phenol wastewater generated using phenol treating described in claim 3, which is characterized in that institute
Stating device includes static mixer (1), and the static mixer (1) is connect by pipeline with oil water separator (2), in the oil
Dephenolize wastewater outlet is arranged in the bottom of separator (2), and oil rich outlet is arranged on the top of the oil water separator (2), described
Oil rich outlet is connect by pipeline with light oil washing column (5), on the pipeline between the oil rich outlet and light oil washing column (5)
Rich oil is set and pumps (3), the top of the light oil washing column (5) is connect by light oil circulating pump (7) with cooler (6), described cold
But device (6) is connect with the static mixer (1) again, and neutral sodium phenolate outlet is arranged in the bottom of the light oil washing column (5).
10. device according to claim 9, which is characterized in that the dephenolize wastewater outlet passes through pipeline and waste water pump (4)
Connection.
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| CN201510388213.0A CN106315891B (en) | 2015-07-03 | 2015-07-03 | Dephenolizing method and dephenolizing device for phenol-containing wastewater generated in phenol refining |
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| CN114249634A (en) * | 2020-09-24 | 2022-03-29 | 宝武炭材料科技有限公司 | Phenol refining method for low-phenol-content wastewater discharge |
| CN115196810B (en) * | 2022-08-16 | 2024-02-13 | 华电水务工程有限公司 | Method for extracting and dephenolizing phenol-containing wastewater |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6113790A (en) * | 1998-12-18 | 2000-09-05 | Basf Corporation | Process for removing water-soluble organics from waste streams |
| CN105418382A (en) * | 2014-09-22 | 2016-03-23 | 上海宝钢化工有限公司 | Purification device and purification method for sodium phenolate containing neutral oil |
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2015
- 2015-07-03 CN CN201510388213.0A patent/CN106315891B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6113790A (en) * | 1998-12-18 | 2000-09-05 | Basf Corporation | Process for removing water-soluble organics from waste streams |
| CN105418382A (en) * | 2014-09-22 | 2016-03-23 | 上海宝钢化工有限公司 | Purification device and purification method for sodium phenolate containing neutral oil |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 2004-2002 Weisan Road Chemical Office Building, Baoshan District, Shanghai Applicant after: Baowu Carbon Material Technology Co., Ltd. Address before: 2004-2002 Weisan Road Chemical Office Building, Baoshan District, Shanghai Applicant before: Chemical Co., Ltd. of Baoshan Iron and Steel Group, Shanghai |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 200942 three chemical engineering office building, Baoshan Iron and steel factory, Shanghai, Baoshan District Patentee after: Baowu Carbon Technology Co.,Ltd. Address before: 200942 three chemical engineering office building, Baoshan Iron and steel factory, Shanghai, Baoshan District Patentee before: BAOWU CARBON MATERIAL TECHNOLOGY Co.,Ltd. |