CN208700930U - A kind of dimethyl disulfide refining separation device - Google Patents
A kind of dimethyl disulfide refining separation device Download PDFInfo
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- CN208700930U CN208700930U CN201721688105.6U CN201721688105U CN208700930U CN 208700930 U CN208700930 U CN 208700930U CN 201721688105 U CN201721688105 U CN 201721688105U CN 208700930 U CN208700930 U CN 208700930U
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Abstract
The utility model discloses a kind of dimethyl disulfide refining separation devices, it mainly include successively being flashed from the thick dimethyl disulfide solution that dimethyl disulfide synthesis system comes out through flash tank, the pressurization removing of methyl mercaptan removing tower, the purification of dimethyl disulfide product tower normal pressure, dimethyltrisulfide concentration tower vacuum separation, the dimethyl disulfide product of final output qualification, and obtain that purity is higher, the better dimethyltrisulfide of utility value, while flash tank and the hydrogen sulfide of methyl mercaptan removing enter methyl mercaptan synthesis system through compressor and recycles.The features such as it is high that this method solve existing dimethyl disulfide distillation system energy consumptions, and product purity is low, the not high problem of product recovery rate, and the utility model has process flow simple, easy to operate, good separating effect, and product recovery rate is high, and economic benefit is obvious.
Description
Technical field
The present invention relates to the refining spearation technical fields of dimethyl disulfide product, particularly belong to a kind of dimethyl disulfide purification
Separator.
Background technique
Dimethyl disulfide is a kind of organic compounds containing sulfur, is light yellow transparent liquid under room temperature, dissolves in alcohol ether, insoluble
Yu Shui, foul smelling.Dimethyl disulfide is widely used, wide market, can be used as the pre- of petroleum hydrodesulfurization catalyst
Vulcanizing agent, industrial solvent, cracking of ethylene coking inhibitor, raw material, soil fumigant, the stench mark for producing insecticide " Entex "
Earnest, at the same be also China provide to allow using flavorant.
The method of synthesization of dimethyl disulfide mainly has at present: dimethyl sulfate method, methyl mercaptan oxidizing process, methanol vulcanization,
Methyl mercaptan vulcanization.Since methyl mercaptan vulcanization process flow is simple, working condition is mild, and technology and equipment is of less demanding, than
Relatively it is suitble to domestic progress industrialized production.In the reaction process of methyl mercaptan vulcanization synthesization of dimethyl disulfide, from reflecting
Material mainly contain hydrogen sulfide, methyl mercaptan, dimethyl disulfide, dimethyltrisulfide, dimethyl disulfide product, needs in order to obtain
Refining spearation is carried out to the material, other impurities are removed.The dimethyl that current dimethyl disulfide refining spearation technique obtains
Two sulphur product purities are not high, and separating effect is not high, and 30% or more is contained in the material that dimethyl disulfide product tower tower bottom comes out
Dimethyl disulfide and 40-60% dimethyltrisulfide solution, if this material directly return system because contain the higher diformazan of concentration
Two sulphur of base has interference to preceding system, while the energy consumption of device increases；Dimethyl disulfide and dimethyltrisulfide is caused to lose if selling outside
Larger, product utilization rate is low.Therefore technique the problems such as that there are energy consumptions is high, inferior separating effect, Product recycling and low utilization rate.
Summary of the invention
The purpose of the present invention is to solve above-mentioned technical problems, provide a kind of with process flow simple operations side
Just, good separating effect, product recovery rate is high, the apparent dimethyl disulfide refining separation method of economic benefit and device.
The present invention it is specific the technical solution adopted is that: a kind of dimethyl disulfide refining separation device, which is characterized in that including
The removing mechanism that is sequentially connected, separating mechanism, purification mechanism, the device further include burned waste gas mechanism, methyl mercaptan combination mechanism,
Methyl mercaptan vulcanizes mechanism, waste gas treatment mechanism, finished product and collects preservation mechanism, and the removing mechanism is used to carry out sulphur to material solution
Change hydrogen removing processing, the removing mechanism is divided into two output ends and is separately connected methyl mercaptan combination mechanism and separating mechanism, described
Separating mechanism is divided into three output ends and is separately connected finished product collection preservation mechanism, purification mechanism and burned waste gas mechanism, described to mention
Pure mechanism is divided into three output ends, is separately connected waste gas treatment mechanism, methyl mercaptan vulcanization mechanism, finished product collecting mechanism；
Further, the removing mechanism includes flash tank, the first delivery pump, methyl mercaptan removing tower, the first condenser,
One backflash, the second delivery pump and third delivery pump, the flash tank have a feed end, and thick dimethyl disulfide passes through feed end
Into in flash tank, there are two output end, an output ends to connect with the first delivery pump for the flash tank, first delivery pump
It is connect with methyl mercaptan removing tower, there are two output end, an output ends to connect with the first condenser for the methyl mercaptan removing tower, separately
One output is connect with third delivery pump, and there are two output end, an output end and the first backflashes to connect for first condenser
It connects, first backflash is connect with the second delivery pump, and second delivery pump is connect with methyl mercaptan vulcanization mechanism, the third
Delivery pump is connect with the separating mechanism；
Further, the removing mechanism further includes compressor, the first condenser another output and flash tank
Another output is connect with compressor, and the compressor is connect with methyl mercaptan combination mechanism；
Further, the separating mechanism includes dimethyl disulfide product tower, the second condenser, the second backflash, the 4th
Delivery pump, the 5th delivery pump, there are two output end, an output end and second condensers for the dimethyl disulfide product tower
Connection, another output are connect with the 5th delivery pump, and there are two output end, an output end and exhaust gas for second condenser
Mechanism connection is burned, another output is connect with the second backflash, and second backflash is connect with the 4th delivery pump, described
4th delivery pump is connect with finished product collecting mechanism, and the 5th delivery pump is connect with purification mechanism；
Further, the purification mechanism includes dimethyltrisulfide concentration tower, third condenser, third backflash, the 6th
Delivery pump, there are three output end, an output ends to connect with third condenser for the dimethyltrisulfide concentration tower, and the third is cold
There are two output end, an output ends to connect with third backflash for condenser, and the third backflash is connect with the 6th delivery pump；
Further, the 6th delivery pump be can pressurized delivered pump, the 6th delivery pump is there are two output end, one
Output end is connect with finished product collecting mechanism, and another output is connect with dimethyl disulfide product tower；
Further, the purification mechanism further includes the 7th delivery pump and the 8th delivery pump, the dimethyltrisulfide concentrate
Other two output end of tower is connect with the 7th delivery pump and the 8th rear pump respectively, the 7th delivery pump and methyl mercaptan vulcanizer
Structure connection, the 8th delivery pump are connect with finished product collecting mechanism；
Further, the third upper end of condenser be equipped with vacuum mechanism, the third condenser another output with
Vacuum mechanism connection, the vacuum mechanism are connect with waste gas treatment mechanism.
Working principle:
The thick dimethyl disulfide solution that dimethyl disulfide synthesis system is come is introduced into flash tank removing hydrogen sulfide, flash distillation
Trench bottom solution enters methyl mercaptan removing tower top through the first delivery pump and is separated, and top gaseous phase is after the condensation of the first condenser
Into the first backflash, the methyl mercaptan solution come out from the first backflash is pumped into methyl mercaptan vulcanization mechanism through the second conveying, from
The fixed gas that first condenser gaseous phase outlet comes out is sent into first after entering compressor pressure-raising together with the hydrogen sulfide that flash tank flashes
Mercaptan combination mechanism；Dimethyl disulfide solution after concentrate comes out from methyl mercaptan removing tower tower bottom, enters through third delivery pump
Dimethyl disulfide product tower, tower top enter the second backflash, the smart dimethyl that the second backflash comes out through the condensation of the second condenser
Two sulphur products are pumped into finished product collecting mechanism storage through the 4th conveying, and tower top fixed gas enters the burning of burned waste gas mechanism；Diformazan
The solution that two sulphur product tower tower bottom of base comes out enters in the middle part of dimethyltrisulfide concentration tower through the 5th delivery pump, the gas phase that tower top comes out
Into third condenser, third condenser gaseous phase outlet and vacuum mechanism are connected to form vacuum, the tail gas that vacuum system comes out into
Enter waste gas treatment mechanism, the lime set that third condenser comes out enters third backflash, qualified two after the pressurization of the 6th delivery pump
Two sulphur product of methyl enters finished product collecting mechanism storage, and substandard product is sent into dimethyl disulfide product tower and is refined again, two
The dimethyltrisulfide solution of methyl trisulfide concentration tower middle and lower part extraction high concentration is pumped into methyl mercaptan vulcanization mechanism through the 7th conveying,
The 8th delivery pump of recombination lease making of tower bottom collects, and can not only recycle, but also can externally sell.
In a preferred embodiment of the present invention, in order to reach good rectification effect, system is synthesized from dimethyl disulfide
The thick dimethyl disulfide solution that comes of uniting is introduced into after flash tank further removes hydrogen sulfide, then carries out dimethyl disulfide purification point
From.
In a preferred embodiment of the present invention, it in order to improve dimethyl disulfide product yield, is produced in dimethyl disulfide
The outlet of product tower tower bottom is provided with dimethyltrisulfide concentration tower, the dimethyl disulfide of the available qualification of tower top.
In a preferred embodiment of the present invention, dimethyltrisulfide concentrate column overhead is connected with vacuum system, makes diformazan
Two sulphur of base and dimethyltrisulfide separate under vacuum conditions, and concentrate and refining effect are more preferable.
This programme has the advantages that
The purity of the dimethyl disulfide product column overhead dimethyl disulfide of the present apparatus goes out 99.5% or more, while in tower bottom
Mouth is connected with dimethyltrisulfide concentration tower, and tower top obtains qualified dimethyl disulfide, and the rate of recovery of product improves, and the two of the present apparatus
Methyl trisulfide concentration tower middle and lower part obtains the dimethyltrisulfide of high-purity, when return system recycles, to preceding systematic influence
Small, the feed stock conversion of system improves before can making, and present apparatus production process is simple, easy to operate, good separating effect, and product returns
High income, economic benefit are obvious.
Detailed description of the invention
Fig. 1 is process flow of the invention and device figure.
In figure: 1 be removing mechanism, 2 be separating mechanism, 3 be purification mechanism, 4 be burned waste gas mechanism, 5 be methyl mercaptan close
It is methyl mercaptan vulcanization mechanism at mechanism, 6,7 be waste gas treatment mechanism, 8 be finished product collecting mechanism, 11 be flash tank, 12 is first
Delivery pump, 13 be methyl mercaptan removing tower, 14 be the first condenser, 15 be the first backflash, 16 be the second delivery pump, 17 be third
Delivery pump, 18 be compressor, 21 be dimethyl disulfide product tower, 22 be the second condenser, 23 be the second backflash, 24 be the 4th
Delivery pump, 25 be the 5th delivery pump, 31 be dimethyltrisulfide concentration tower, 32 be third condenser, 33 be third backflash, 34 be
6th delivery pump, 35 be the 7th delivery pump, 36 be the 8th delivery pump, 37 be vacuum system.
Specific embodiment
Below with reference to technical solution of the present invention and attached drawing, the implementation process of this programme is described in detail:
A kind of dimethyl disulfide refining separation device, including removing mechanism 1, separating mechanism 2, the purification mechanism being sequentially connected
3, the device further include burned waste gas mechanism 4, methyl mercaptan combination mechanism 5, methyl mercaptan vulcanization mechanism 6, waste gas treatment mechanism 7, at
Product collect preservation mechanism 8, and removing mechanism 1 is used to carry out material solution hydrogen sulfide stripping processing, and removing mechanism 1 is divided to defeated for two
Outlet is separately connected methyl mercaptan combination mechanism 5 and separating mechanism 2, and separating mechanism 2, which divides, is separately connected finished product receipts for three output ends
Collect preservation mechanism 8, purification mechanism 3 and burned waste gas mechanism 4, purification mechanism 3 divides for three output ends, is separately connected exhaust-gas treatment
Mechanism 7, methyl mercaptan vulcanize mechanism 8, finished product collecting mechanism 9；
Further, removing mechanism 1 includes flash tank 11, the first delivery pump 12, methyl mercaptan removing tower 13, the first condenser
14, the first backflash 15, the second delivery pump 16 and third delivery pump 17, flash tank 11 have a feed end, thick dimethyl disulfide
Being entered in flash tank 11 by feed end, there are two output end, an output ends to connect with the first delivery pump 12 for flash tank 11, the
One delivery pump 12 is connect with methyl mercaptan removing tower 13, and methyl mercaptan removing tower 13 is there are two output end, an output end and first cold
Condenser 14 connects, another output is connect with third delivery pump 17, and there are two output end, an output ends for the first condenser 14
It is connect with the first backflash 15, the first backflash 15 is connect with the second delivery pump 16, the second delivery pump 16 and methyl mercaptan vulcanizer
Structure 6 connects, and third delivery pump 17 is connect with separating mechanism 2；
Further, removing mechanism 1 further includes compressor 18, and 14 another output of the first condenser and flash tank 11 are another
One output end is connect with compressor 18, and compressor 18 is connect with methyl mercaptan combination mechanism 5；
Further, separating mechanism 2 includes dimethyl disulfide product tower 21, the second condenser 22, the second backflash 23, the
Four delivery pumps 24, the 5th delivery pump 25, there are two output end, an output end and the second condensers for dimethyl disulfide product tower 21
22 connections, another output connect with the 5th delivery pump 25, the second condenser 22 there are two output end, an output end with give up
Gas burns mechanism 4 and connects, and another output is connect with the second backflash 23, and the second backflash 23 and the 4th delivery pump 24 connect
It connects, the 4th delivery pump 24 is connect with finished product collecting mechanism 9, and the 5th delivery pump 25 is connect with purification mechanism 3；
Further, purification mechanism 3 includes dimethyltrisulfide concentration tower 31, third condenser 32, third backflash 33, the
Six delivery pumps 34, there are three output end, an output ends to connect with third condenser 32 for dimethyltrisulfide concentration tower 31, and third is cold
There are two output end, an output ends to connect with third backflash 33 for condenser 32, and third backflash 33 and the 6th delivery pump 34 connect
It connects；
Further, the 6th delivery pump 34 be can pressurized delivered pump, there are two output end, an outputs for the 6th delivery pump 34
End is connect with finished product collecting mechanism 9, and another output is connect with dimethyl disulfide product tower 21；
Further, purification mechanism 3 further includes the 7th delivery pump 35 and the 8th delivery pump 36, dimethyltrisulfide concentration tower 31
Other two output end is connect with the 7th delivery pump 35 and the 8th delivery pump 36 respectively, the 7th delivery pump 35 and methyl mercaptan vulcanizer
Structure 6 connects, and the connection of the 8th delivery pump 36 is connect with finished product collecting mechanism 9；
Further, 32 upper end of third condenser is equipped with vacuum mechanism 37,32 another output of third condenser and true
Empty mechanism 37 connects, and vacuum mechanism 37 is connect with waste gas treatment mechanism 7.
Specific embodiment: the thick dimethyl disulfide solution to come from dimethyl disulfide synthesis system mainly forms are as follows: diformazan
Two sulphur 32% of base, trimethyl trithio 55%, methyl mercaptan 10% and hydrogen sulfide and other Trace Components, flow 3500Kg/h
It is flashed into flash tank absolute pressure, controls operating pressure in 0.05MpaG, 90% or more hydrogen sulfide flashes away at this time, removes sulphur
The solution for changing hydrogen contains a certain amount of methyl mercaptan, needs to enter methyl mercaptan removing tower and is separated, controls methyl mercaptan removing tower pressure
For power in 100-250KpaG, the methyl mercaptan solution that tower top obtains dimethyl disulfide content≤1% enters methyl mercaptan curing system, tower top
The hydrogen sulfide that fixed gas and flash tank come out is mixed into compressor, and the hydrogen sulfide gas after pressurization is sent into methyl mercaptan synthesis system
System；Dimethyl disulfide solution after concentrate removes tower bottom from methyl mercaptan and enters dimethyl disulfide product tower through pump, controls tower top
Pressure adjusts suitable reflux ratio for tower top dimethyl disulfide purity stabilization and is sent into finished product storage tank 99.5% or more in 0-30KpaG,
Tower bottom contains dimethyl disulfide and the solution of dimethyltrisulfide enters dimethyltrisulfide concentration tower, adjusts vacuum degree in -0.1-
Between 0KpaG, tower top obtains qualified dimethyl disulfide and is pumped up into finished product storage tank after the separation of dimethyltrisulfide concentration tower,
Dimethyltrisulfide concentration tower middle and lower part obtains the dimethyltrisulfide solution that concentration is 80% or more and enters methyl mercaptan sulphur after pumping pressure-raising
The recombination lease making pump of change system, tower bottom collects, and can not only recycle, but also can externally sell.It is closed from dimethyl disulfide
It is mainly formed at the thick dimethyl disulfide solution that system comes are as follows: dimethyl disulfide 32%, trimethyl trithio 55%, methyl mercaptan
10% and hydrogen sulfide and other Trace Components, flow be that 3500Kg/h enters the flash distillation of 11 absolute pressure of flash tank, control operation pressure
Power is in 0.05MpaG, and 90% or more hydrogen sulfide flashes away at this time, and the solution for removing hydrogen sulfide contains a certain amount of methyl mercaptan,
It needs to enter methyl mercaptan removing tower 13 to be separated, controls 13 pressure of methyl mercaptan removing tower in 100-250KpaG, tower top obtains two
The methyl mercaptan solution of two sulfur content≤1% of methyl enters methyl mercaptan vulcanization mechanism 6, the vulcanization that tower top fixed gas and flash tank come out
Hydrogen is mixed into compressor 18, and the hydrogen sulfide gas after pressurization is sent into methyl mercaptan combination mechanism 5；Dimethyl disulfide after concentrate is molten
Liquid enters dimethyl disulfide product tower 21 through pump from 13 bottom of methyl mercaptan removing tower, and control tower top pressure is adjusted in 0-30KpaG
Suitable reflux ratio, which stablizes tower top dimethyl disulfide purity, is sent into finished product collecting mechanism 8 99.5% or more, and tower bottom contains dimethyl
The solution of two sulphur and dimethyltrisulfide enters dimethyltrisulfide concentration tower 31, vacuum degree is adjusted between -0.1-0KpaG, through two
The dimethyl disulfide that tower top obtains qualification after methyl trisulfide concentration tower 31 separates is pumped up into finished product collecting mechanism 8, in dimethyl
31 middle and lower part of trithio concentration tower obtains the dimethyltrisulfide solution that concentration is 80% or more and enters methyl mercaptan vulcanizer after pumping pressure-raising
Structure 6, the heavy constituent of tower bottom is pumped up into finished product collecting mechanism 8, can not only recycle, but also can externally sell.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of dimethyl disulfide refining separation device, which is characterized in that including be sequentially connected removing mechanism (1), seperator
Structure (2), purification mechanism (3), which further includes burned waste gas mechanism (4), methyl mercaptan combination mechanism (5), methyl mercaptan vulcanizer
Structure (6), waste gas treatment mechanism (7), finished product collecting mechanism (8), the removing mechanism (1) are used to carry out hydrogen sulfide to material solution
Removing processing, the removing mechanism (1) are divided into two output ends and are separately connected methyl mercaptan combination mechanism (5) and separating mechanism (2),
The separating mechanism (2) is divided into three output ends and is separately connected finished product collecting mechanism (8), purification mechanism (3) and burned waste gas machine
Structure (4), the purification mechanism (3) are divided into three output ends, are separately connected waste gas treatment mechanism (7), methyl mercaptan vulcanization mechanism
(6), finished product collecting mechanism (8).
2. a kind of dimethyl disulfide refining separation device according to claim 1, it is characterised in that: the removing mechanism
It (1) include flash tank (11), the first delivery pump (12), methyl mercaptan removing tower (13), the first condenser (14), the first backflash
(15), the second delivery pump (16) and third delivery pump (17), the flash tank (11) are equipped with feed end, and thick dimethyl disulfide is logical
Crossing feed end, there are two output end, an output end and the first delivery pumps into the flash tank (11) flash tank (11)
(12) it connects, first delivery pump (12) connect with methyl mercaptan removing tower (13), and there are two the methyl mercaptan removing towers (13)
Output end, an output end are connect with the first condenser (14), another output is connect with third delivery pump (17), and described first
There are two output end, an output end is connect condenser (14) with the first backflash (15), first backflash (15) and the
Two delivery pumps (16) connection, second delivery pump (16) connect with methyl mercaptan vulcanization mechanism (6), the third delivery pump (17)
It is connect with separating mechanism (2).
3. a kind of dimethyl disulfide refining separation device according to claim 2, it is characterised in that: the removing mechanism
(1) further include compressor (18), the first condenser (14) another output and flash tank (11) another output with
Compressor (18) connection, the compressor (18) connect with methyl mercaptan combination mechanism (5).
4. a kind of dimethyl disulfide refining separation device according to claim 1, it is characterised in that: the separating mechanism
It (2) include dimethyl disulfide product tower (21), the second condenser (22), the second backflash (23), the 4th delivery pump (24), the 5th
Delivery pump (25), there are two output ends for the dimethyl disulfide product tower (21), and an output end and the second condenser (22) are even
It connects, another output is connect with the 5th delivery pump (25), and there are two output end, an output ends for second condenser (22)
It is connect with burned waste gas mechanism (4), another output is connect with the second backflash (23), second backflash (23) and the
Four delivery pumps (24) connection, the 4th delivery pump (24) connect with finished product collecting mechanism (8), the 5th delivery pump (25) and
Purify mechanism (3) connection.
5. a kind of dimethyl disulfide refining separation device according to claim 1, it is characterised in that: the purification mechanism
It (3) include dimethyltrisulfide concentration tower (31), third condenser (32), third backflash (33), the 6th delivery pump (34), it is described
There are three output end, an output ends to connect with third condenser (32) for dimethyltrisulfide concentration tower (31), the third condensation
There are two output end, an output end is connect device (32) with third backflash (33), the third backflash (33) and the 6th defeated
Pump (34) are sent to connect.
6. a kind of dimethyl disulfide refining separation device according to claim 5, it is characterised in that: the 6th delivery pump
(34) for can pressurized delivered pump, the 6th delivery pump (34) is there are two output end, an output end and finished product collecting mechanism (8)
Connection, another output are connect with dimethyl disulfide product tower (21).
7. a kind of dimethyl disulfide refining separation device according to claim 1, it is characterised in that: the purification mechanism
It (3) further include the 7th delivery pump (35) and the 8th delivery pump (36), dimethyltrisulfide concentration tower (31) the another two output end
It is connect respectively with the 7th delivery pump (35) and the 8th delivery pump (36), the 7th delivery pump (35) and methyl mercaptan vulcanize mechanism
(6) it connects, the 8th delivery pump (36) connect with finished product collecting mechanism (8).
8. a kind of dimethyl disulfide refining separation device according to claim 5, it is characterised in that: the third condenser
(32) upper end is equipped with vacuum mechanism (37), and third condenser (32) another output is connect with vacuum mechanism (37), institute
Vacuum mechanism (37) is stated to connect with waste gas treatment mechanism (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721688105.6U CN208700930U (en) | 2017-12-07 | 2017-12-07 | A kind of dimethyl disulfide refining separation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721688105.6U CN208700930U (en) | 2017-12-07 | 2017-12-07 | A kind of dimethyl disulfide refining separation device |
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| CN208700930U true CN208700930U (en) | 2019-04-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114558533A (en) * | 2022-04-06 | 2022-05-31 | 河南君合新材料科技有限公司 | Sodium methyl mercaptide and dimethyl disulfide joint production system and process |
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2017
- 2017-12-07 CN CN201721688105.6U patent/CN208700930U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114558533A (en) * | 2022-04-06 | 2022-05-31 | 河南君合新材料科技有限公司 | Sodium methyl mercaptide and dimethyl disulfide joint production system and process |
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Address after: 570000 No. a5002-323, A1 area, Fuxing City, 32 Binhai Avenue, Longhua District, Haikou City, Hainan Province Patentee after: Chadu (Hainan) Technology Co.,Ltd. Address before: Part 541, 5A / F, building B, 155 Fute West 1st Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee before: CHADU (SHANGHAI) TECHNOLOGY Co.,Ltd. |