CN207507459U - A kind of high-purity triphenylchloromethane process units - Google Patents
A kind of high-purity triphenylchloromethane process units Download PDFInfo
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- CN207507459U CN207507459U CN201721336766.2U CN201721336766U CN207507459U CN 207507459 U CN207507459 U CN 207507459U CN 201721336766 U CN201721336766 U CN 201721336766U CN 207507459 U CN207507459 U CN 207507459U
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- Prior art keywords
- reaction kettle
- triphenylchloromethane
- solenoid valve
- temperature sensor
- purity
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Abstract
The utility model provides a kind of high-purity triphenylchloromethane process units, including sequentially connected first reaction kettle, the second reaction kettle, separator box, third reaction kettle and filtering for crystallizing case；First reaction kettle, separator box, is equipped with agitating device and constant feeder on third reaction kettle at the second reaction kettle；Pressure sensor and the first temperature sensor are equipped in first reaction kettle, second reaction kettle is equipped with primary heater and second temperature sensor, cooling piece and the 4th temperature sensor are equipped in separator box, third reaction kettle side wall is equipped with secondary heater and third temperature sensor, its production stage to triphenylchloromethane has carried out specific differentiation, the important reaction process of its each step is individually handled, and stringent control material ratio and reaction condition, so that entire reaction process is close to perfect condition, so as to substantially increase the production rate of recovery of triphenylchloromethane, it ensure that the purity of the triphenylchloromethane of production is greatly promoted.
Description
Technical field
The utility model is related to triphenylchloromethane production field, more particularly to a kind of high-purity triphenyl chloromethane
Alkane process units.
Background technology
Triphenylchloromethane is one of common basic organic in field of medicine and chemical technology, is closed in organic chemical industry and drug
Into selective protection base, the Yi Jiduo of the primary hydroxyl that, may be used as being carried in the compounds such as nucleosides, monosaccharide or polysaccharide in the process
Basic chemical reagent in peptide synthesis；And the purity for selling triphenylchloromethane on the market now is inadequate, and purity is required
It then needs the later stage that finished product is further purified, increases secondary processing cost, and process equipment cost is high, leads to production cost
Increase.
Utility model content
The defects of in order to overcome the prior art, problem to be solved in the utility model are to propose a kind of high-purity triphen
Base chloromethanes process units has carried out specific differentiation to the production stage of triphenylchloromethane, its each step is important
Reaction process is individually handled, and stringent control material ratio and reaction condition so that entire reaction process is close to preferable shape
State, so as to which the purity for substantially increasing the production rate of recovery of triphenylchloromethane, the triphenylchloromethane that ensure that production is able to
It greatly promotes.
For this purpose, the utility model uses following technical scheme：
The utility model provides a kind of high-purity triphenylchloromethane process units, including the first reaction kettle, second instead
Answer kettle, separator box, third reaction kettle and filtering for crystallizing case；First reaction kettle passes through first pipe with second reaction kettle
Connection, second reaction kettle are connect with the separator box by second pipe, and the separator box leads to the third reaction kettle
The connection of third pipeline is crossed, the third reaction kettle is connect with the filtering for crystallizing case by the 4th pipeline；First reaction kettle,
Second reaction kettle, the separator box are equipped with agitating device and constant feeder on the third reaction kettle；Further include
One gas tank, first gas tank are connected with first reaction kettle by the first gas-guide tube, and first gas-guide tube is equipped with
First solenoid valve；Pressure sensor and the first temperature sensor, the second reaction kettle side wall are equipped in first reaction kettle
Equipped with primary heater, and the heat-generating pipe of the primary heater is located in second reaction kettle；In second reaction kettle
Equipped with second temperature sensor；Cooling piece and the 4th temperature sensor are equipped in the separator box；The third reaction kettle side wall
Secondary heater is equipped with, the heat-generating pipe of the secondary heater is located in the third reaction kettle, and the third reaction kettle
Interior to be equipped with third temperature sensor and condenser pipe, the condenser pipe is close to the third reaction kettle upper wall；The pressure sensor,
First temperature sensor, the primary heater, the second temperature sensor, the cooling piece, the 4th temperature
Sensor, the secondary heater, the third temperature sensor and the first solenoid valve Method of Averaging Controller electrically connect.
In the utility model preferably technical solution, the agitating device includes motor and stirring rod, the stirring rod
Positioned at container is internal, the motor is located at external container；The stirring rod is equipped with paddle and the paddle is equipped with more
A through-hole, the motor are electrically connected with the controller.
In the utility model preferably technical solution, set on first reaction kettle there are two the constant feeder,
And two constant feeders are connected with first reaction kettle；Set on second reaction kettle there are one it is described quantitatively to
Material machine, the constant feeder are connected with second reaction kettle by the 5th pipeline, and the 5th pipeline is equipped with flow
Control valve, the flow control valve are electrically connected with the controller；Set on the separator box there are two the constant feeder and
Two constant feeders are connected with the separator box；Set on the third reaction kettle there are two the constant feeder,
And two constant feeders are connected with the third reaction kettle.
In the utility model preferably technical solution, the constant feeder includes charging basket and weightless title, the weightlessness
Claim to be located at the charging basket bottom；The bucket wall bottom of the charging basket is equipped with discharge nozzle, and the discharge nozzle is equipped with third solenoid valve, institute
It states weightless title and the third solenoid valve is electrically connected with the controller.
In the utility model preferably technical solution, water tank is further included, the water tank passes through the 6th pipeline and described the
One reaction kettle connects, and the 6th pipeline is equipped with the first air pump and the 4th solenoid valve, first air pump and the described 4th
Solenoid valve is electrically connected with the controller.
In the utility model preferably technical solution, the second gas tank is further included, second gas tank is anti-with described second
Kettle is answered to be connected by the second gas-guide tube, and second gas-guide tube is equipped with the second air pump and second solenoid valve, second electricity
Magnet valve and second air pump are electrically connected with the controller.
In the utility model preferably technical solution, the separator box bottom is equipped with drainpipe, is set on the drainpipe
There is density sensor, and the 5th solenoid valve, the density sensor and the 5th solenoid valve are equipped in the drainage pipe end
The uniform controller electrically connects.
In the utility model preferably technical solution, the first pipe, the second pipe, the third pipeline,
Liquid pump and flow cut-off solenoid valve are equipped on 4th pipeline, the liquid pump is electric with the controller with the flow cut-off solenoid valve
Connection.
In the utility model preferably technical solution, the first pipe, the second pipe, the third pipeline,
4th pipeline, the 5th pipeline, the 6th pipeline, the inner wall of first gas-guide tube and second gas-guide tube are equal
It is coated with erosion shield.
The beneficial effects of the utility model are：
A kind of high-purity triphenylchloromethane process units provided by the utility model, including the first reaction kettle, second
Reaction kettle, separator box, third reaction kettle and filtering for crystallizing case；The important reaction process of its each step is individually handled, is avoided more
Interacting between the raw material and product of a step, ensures being normally carried out for reaction process；It is strictly controlled by constant feeder
Material ratio processed and provide the suitable reaction condition needed for each reaction step so that entire reaction process is close to ideal
State, so as to which the purity for substantially increasing the production rate of recovery of triphenylchloromethane, the triphenylchloromethane that ensure that production obtains
To greatly promote.
Description of the drawings
Fig. 1 is the structural representation for the high-purity triphenylchloromethane process units that specific embodiment of the present invention provides
Figure；
Fig. 2 is the structure diagram for the constant feeder that specific embodiment of the present invention provides.
In figure：
100th, the first reaction kettle, 110, pressure sensor；120th, the first temperature sensor；200th, the second reaction kettle；210、
Primary heater；211st, heat-generating pipe；220th, second temperature sensor；300th, third reaction kettle；310th, secondary heater；320th,
Three-temperature sensor；330th, condenser pipe；400th, separator box；410th, cooling piece；420th, the 4th temperature sensor；430th, drainpipe；
431st, density sensor；432nd, the 5th solenoid valve；500th, filtering for crystallizing case；610th, first pipe；620th, second pipe；630、
Third pipeline；640th, the 4th pipeline；650th, the 5th pipeline；651st, flow control valve；660th, the 6th pipeline；661st, the first air pump；
662nd, the 4th solenoid valve；670th, the first gas-guide tube；671st, the first solenoid valve；680th, the second gas-guide tube；681st, the second air pump；
682nd, second solenoid valve；691st, liquid pump；692nd, flow cut-off solenoid valve；700th, agitating device；710th, motor；720th, stirring rod；721、
Paddle；722nd, through-hole；800th, constant feeder；810th, charging basket；820th, it is weightless to claim；830th, discharge nozzle；831st, third electromagnetism
Valve；910th, the first gas tank；920th, water tank；930th, the second gas tank；940th, controller.
Specific embodiment
Further illustrate the technical solution of the utility model below with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, a kind of high-purity triphenylchloromethane process units is provided in the present embodiment, including the first reaction
Kettle 100, the second reaction kettle 200, separator box 400, third reaction kettle 300 and filtering for crystallizing case 500；First reaction kettle 100
It is connect with second reaction kettle 200 by first pipe 610, second reaction kettle 200 and the separator box 400 pass through the
Two pipelines 620 connect, and the separator box 400 is connect with the third reaction kettle 300 by third pipeline 630, and the third is anti-
Kettle 300 is answered to be connect with the filtering for crystallizing case 500 by the 4th pipeline 640；First reaction kettle 100, second reaction
Kettle 200, the separator box 400 are equipped with agitating device 700 and constant feeder 800 on the third reaction kettle 300；Also wrap
The first gas tank 910 is included, first gas tank 910 is connected, and described with first reaction kettle 100 by the first gas-guide tube 670
First gas-guide tube 670 is equipped with the first solenoid valve 671；Pressure sensor 110 and first is equipped in first reaction kettle 100
Temperature sensor 120,200 side wall of the second reaction kettle are equipped with primary heater 210, and the hair of the primary heater 210
Heat pipe 211 is located in second reaction kettle 200；Second temperature sensor 220 is equipped in second reaction kettle 200；It is described
410 and the 4th temperature sensor 420 of cooling piece is equipped in separator box 400；300 side wall of third reaction kettle is equipped with second
Heater 310, the heat-generating pipe 211 of the secondary heater 310 are located in the third reaction kettle 300, and the third is reacted
Third temperature sensor 320 and condenser pipe 330 are equipped in kettle 300, the condenser pipe 330 is on the third reaction kettle 300
Wall；The pressure sensor 110, first temperature sensor 120, the primary heater 210, second temperature sensing
Device 220, the cooling piece 410, the 4th temperature sensor 420, the secondary heater 310, the third temperature sensing
Device 320 and first solenoid valve, 671 Method of Averaging Controller 940 electrically connect.
Above-mentioned high-purity triphenylchloromethane process units, is quantitatively given into first reaction kettle 100 by described
Material machine 800 quantitatively adds purified petroleum benzin and aluminium powder, is stirred, and when temperature is down to preference temperature, first gas tank 910 is described in
Gas supply in first reaction kettle 100, until in first reaction kettle 100 air pressure maintain appropriate pressure, then closed described the
One reaction kettle 100 is simultaneously stirred, last pressure release；It is multiple to repeat the above operation for being passed through hydrogen chloride gas-deflation release, until
Pressure no longer declines after being passed through hydrogen chloride gas, obtains the benzene suspension of alchlor；By the benzene suspension of alchlor send to
In second reaction kettle 200, start the primary heater 210, heat up and temperature is controlled then to pass through in preference temperature
The constant feeder 800 quantitatively adds carbon tetrachloride and the uninterrupted stirring kept the temperature, until reaction does not regenerate chlorination
Hydrogen；Solution is sent to the separator box 400, the addition extraction in the separator box 400 after cooling to preference temperature
Liquid, stirring stand, are layered and discharge lower floor's liquid, retain upper solution；Solution is sent into the third reaction kettle 300,
Thionyl chloride and activated carbon are quantitatively added, then starts the secondary heater 310, heating confluence decolorization；It finally will be molten
Liquid, which is sent to the filtering for crystallizing case 500, to be crystallized, generates product；Entire production process, by the important reaction process of each step
Individually processing avoids interacting between the raw material and product of multiple steps, ensures being normally carried out for reaction process；Pass through institute
It states 800 stringent control material ratio of constant feeder and the suitable reaction condition needed for each reaction step is provided so that is whole
A reaction process is close to perfect condition, so as to substantially increase the production rate of recovery of triphenylchloromethane, ensure that production
The purity of triphenylchloromethane is greatly promoted.
Further, the agitating device 700 includes motor 710 and stirring rod 720, and the stirring rod 720 is located at container
Internal, described motor 710 is located at external container；The stirring rod 720 is equipped on paddle 721 and the paddle 721 and sets
There are multiple through-holes 722, the motor 710 is electrically connected with the controller 940；The setting of the agitating device 700 be convenient for into
It is stirred in row chemical reaction process, is that reactant contact is more abundant, accelerates reaction process；Wherein described paddle 721
Design can increase contact area, the design of the through-hole 722 convenient for material flowing with mixing, ensure that the reaction was complete.
Further, set on first reaction kettle 100 there are two the constant feeder 800 and two it is described quantitative
Batcher 800 is connected with first reaction kettle 100；The constant feeder there are one being set on second reaction kettle 200
800, the constant feeder 800 is connected with second reaction kettle 200 by the 5th pipeline 650, and the 5th pipeline 650
Flow control valve 651 is equipped with, the flow control valve 651 is electrically connected with the controller 940；It is set on the separator box 400
There are two the constant feeders 800 and two constant feeders 800 to connect with the separator box 400；The third
It sets to react with the third there are two the constant feeder 800 and two constant feeders 800 on reaction kettle 300
Kettle 300 connects；The reaction process carried out in first reaction kettle 100 needs to add two kinds of materials, in the described second reaction
The reaction process carried out in kettle 200 needs to add a kind of material, and the reaction process carried out in the third reaction kettle 300 needs
Two kinds of materials are added, the reaction process carried out in the separator box 400 needs to add two kinds of materials；It is added in whole process
Material carry out stringent control, the design control material ratio of the constant feeder 800 improves triphenylchloromethane
Yield.
More specifically, it needs to be slowly added to carbon tetrachloride in the chemical reaction process in second reaction kettle 200, institute
The design for stating flow control valve 651 is participated in the form of being added dropwise in reaction convenient for carbon tetrachloride.
Further, the constant feeder 800 includes charging basket 810 and weightless title 820, and the weightless title 820 is located at institute
State charging basket bottom 810；The bucket wall bottom of the charging basket 810 is equipped with discharge nozzle 830, and the discharge nozzle 830 is equipped with third electromagnetism
Valve 831, the weightless title 820 and the third solenoid valve 831 are electrically connected with the controller 940；Participate in the material of reaction
For liquid or powder, the design of the third solenoid valve 831 can accurately control feed always；The weightless title 820 then may be used
The weight of material added needed for stringent control.
Further, water tank 920 is further included, the water tank 920 passes through the 6th pipeline 660 and first reaction kettle 100
Connection, and the 6th pipeline 660 is equipped with the first air pump 661 and the 4th solenoid valve 662, first air pump 661 and described
4th solenoid valve 662 is electrically connected with the controller 940；The normality of 4th solenoid valve 662 is closed state, be ensure that
Required pressure requirements in first reaction kettle 100；When needing pressure release after first reaction kettle 100 reaction, the water
Case 920 is under the action of first air pump 661 and the 4th solenoid valve 662 to extra in first reaction kettle 100
Gas is absorbed.
Preferably, the predominantly hydrogen chloride gas that the water tank 920 absorbs can be used to prepare hydrochloric acid and for subsequently extracting
It takes in step.
Further, the second gas tank 930 is further included, second gas tank 930 and second reaction kettle 200 pass through the
Two gas-guide tubes 680 connect, and second gas-guide tube 680 be equipped with the second air pump 681 and second solenoid valve 682, described second
Solenoid valve 682 and second air pump 681 are electrically connected with the controller 940；Occur in second reaction kettle 200
Chemical reaction can generate hydrogen chloride gas, and second gas tank 930 is in second air pump 681 and the second solenoid valve 682
Under the action of by the recycling of the hydrogen chloride gas of generation, storage.
Further, 400 bottom of separator box is equipped with drainpipe 430, and the drainpipe 430 is equipped with density sensor
431, and it is equipped with the 5th solenoid valve 432, the density sensor 431 and the 5th solenoid valve in 430 end of drainpipe
The 432 uniform controllers 940 electrically connect；It is standing and the layering of solution in the process of the separator box 400, the drainpipe
Water in lower floor can be drained into the external world by 430, when the density sensor 431 detects that upper solution is down to bottom, be closed
5th solenoid valve 432, avoids the loss of useful solution.
Further, the first pipe 610, the second pipe 620, the third pipeline 630, the 4th pipeline
Be equipped with liquid pump 691 and flow cut-off solenoid valve 692 on 640, the liquid pump 691 and the flow cut-off solenoid valve 692 with the control
Device 940 electrically connects；The liquid pump 691 is flowing through the first pipe 610, the second pipe 620, described for reaction solution
Enough power is provided when three pipelines 630, four pipeline 640, convenient for solution in first reaction kettle 100, described
Circulation between two reaction kettles 200, the separator box 400, the third reaction kettle 300 and the filtering for crystallizing case 500；It is described
Flow cut-off solenoid valve 692 can then be prevented from mutually mixing between the reaction mass of each reaction vessel, be interfered, and ensure each reaction process
Independent progress.
Further, the first pipe 610, the second pipe 620, the third pipeline 630, the 4th pipeline
640th, the 5th pipeline 650, the 6th pipeline 660, first gas-guide tube 670 and second gas-guide tube 680 is interior
Wall is coated with erosion shield；Reaction is participated in production process has a large amount of corrosive gas and solution, and corrosion-inhibiting coating is set
Meter can prevent the first pipe 610, second pipe 620, the third pipeline 630, the 4th pipeline 640, described
5th pipeline 650, the 6th pipeline 660, first gas-guide tube 670 and second gas-guide tube 680 and corrosive gas
Or liquid is in direct contact, and avoids the breakage of equipment and the leakage of material.
The utility model is described with reference to the preferred embodiments, and those skilled in the art know, is not departing from this reality
In the case of with novel spirit and scope, various changes or equivalence replacement can be carried out to these features and embodiment.This reality
It is not limited to the particular embodiment disclosed with novel, other embodiments fallen into claims hereof all belong to
In the range of the utility model protection.
Claims (8)
1. a kind of high-purity triphenylchloromethane process units, it is characterised in that：
Including the first reaction kettle (100), the second reaction kettle (200), separator box (400), third reaction kettle (300) and filtering for crystallizing
Case (500)；First reaction kettle (100) is connect with second reaction kettle (200) by first pipe (610), and described
Two reaction kettles (200) are connect with the separator box (400) by second pipe (620), the separator box (400) and the third
Reaction kettle (300) is connected by third pipeline (630), and the third reaction kettle (300) passes through with the filtering for crystallizing case (500)
4th pipeline (640) connects；First reaction kettle (100), second reaction kettle (200), the separator box (400), institute
It states and agitating device (700) and constant feeder (800) is equipped on third reaction kettle (300)；
The first gas tank (910) is further included, first gas tank (910) passes through the first gas-guide tube with first reaction kettle (100)
(670) it connects, and first gas-guide tube (670) is equipped with the first solenoid valve (671)；
Pressure sensor (110) and the first temperature sensor (120) are equipped in first reaction kettle (100), described second is anti-
Kettle (200) side wall is answered to be equipped with primary heater (210), and the heat-generating pipe (211) of the primary heater (210) is positioned at described the
In two reaction kettles (200)；Second temperature sensor (220) is equipped in second reaction kettle (200)；The separator box (400)
It is interior to be equipped with cooling piece (410) and the 4th temperature sensor (420)；Third reaction kettle (300) side wall is equipped with the second heating
Device (310), the heat-generating pipe (211) of the secondary heater (310) is in the third reaction kettle (300), and the third
Third temperature sensor (320) and condenser pipe (330) are equipped in reaction kettle (300), the condenser pipe (330) is close to the third
Reaction kettle (300) upper wall；
The pressure sensor (110), first temperature sensor (120), the primary heater (210), described second
Temperature sensor (220), the cooling piece (410), the 4th temperature sensor (420), the secondary heater (310),
The third temperature sensor (320) and first solenoid valve (671) Method of Averaging Controller (940) electrically connect.
2. high-purity triphenylchloromethane process units according to claim 1, it is characterised in that：
The agitating device (700) includes motor (710) and stirring rod (720), the stirring rod (720) inside container,
The motor (710) is positioned at external container；The stirring rod (720) is equipped with paddle (721) and the paddle (721)
Multiple through-holes (722) are equipped with, the motor (710) electrically connects with the controller (940).
3. high-purity triphenylchloromethane process units according to claim 1, it is characterised in that：
The constant feeder (800) and two constant feeders there are two being set on first reaction kettle (100)
(800) it is connected with first reaction kettle (100)；The constant feeder there are one being set on second reaction kettle (200)
(800), the constant feeder (800) is connected with second reaction kettle (200) by the 5th pipeline (650), and described
Five pipelines (650) are equipped with flow control valve (651), and the flow control valve (651) electrically connects with the controller (940)；
It sets on the separator box (400) there are two the constant feeder (800) and two constant feeders (800) and institute
State separator box (400) connection；Set that there are two described in the constant feeder (800) and two on the third reaction kettle (300)
Constant feeder (800) is connected with the third reaction kettle (300).
4. high-purity triphenylchloromethane process units according to claim 1, it is characterised in that：
The constant feeder (800) includes charging basket (810) and weightless title (820), and the weightless title (820) is positioned at the charging basket
(810) bottom；The bucket wall bottom of the charging basket (810) is equipped with discharge nozzle (830), and the discharge nozzle (830) is equipped with third electricity
Magnet valve (831), the weightless title (820) and the third solenoid valve (831) are electrically connected with the controller (940).
5. high-purity triphenylchloromethane process units according to claim 1, it is characterised in that：
Water tank (920) is further included, the water tank (920) is connected by the 6th pipeline (660) with first reaction kettle (100),
And the 6th pipeline (660) is equipped with the first air pump (661) and the 4th solenoid valve (662), first air pump (661) and institute
The 4th solenoid valve (662) is stated to electrically connect with the controller (940).
6. high-purity triphenylchloromethane process units according to claim 1, it is characterised in that：
The second gas tank (930) is further included, second gas tank (930) passes through the second gas-guide tube with second reaction kettle (200)
(680) connect, and second gas-guide tube (680) be equipped with the second air pump (681) and second solenoid valve (682), described second
Solenoid valve (682) and second air pump (681) are electrically connected with the controller (940).
7. high-purity triphenylchloromethane process units according to claim 1, it is characterised in that：
Separator box (400) bottom is equipped with drainpipe (430), and the drainpipe (430) is equipped with density sensor (431),
And it is equipped with the 5th solenoid valve (432), the density sensor (431) and the 5th electromagnetism in the drainpipe (430) end
Uniformly the controller (940) electrically connects valve (432).
8. high-purity triphenylchloromethane process units according to claim 1, it is characterised in that：
The first pipe (610), the second pipe (620), the third pipeline (630), on the 4th pipeline (640)
Be equipped with liquid pump (691) and flow cut-off solenoid valve (692), the liquid pump (691) and the flow cut-off solenoid valve (692) with the control
Device (940) processed electrically connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721336766.2U CN207507459U (en) | 2017-10-17 | 2017-10-17 | A kind of high-purity triphenylchloromethane process units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721336766.2U CN207507459U (en) | 2017-10-17 | 2017-10-17 | A kind of high-purity triphenylchloromethane process units |
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| Publication Number | Publication Date |
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| CN207507459U true CN207507459U (en) | 2018-06-19 |
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ID=62534696
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721336766.2U Expired - Fee Related CN207507459U (en) | 2017-10-17 | 2017-10-17 | A kind of high-purity triphenylchloromethane process units |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111001365A (en) * | 2019-12-23 | 2020-04-14 | 张小飞 | Fine chemical product purification equipment |
-
2017
- 2017-10-17 CN CN201721336766.2U patent/CN207507459U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111001365A (en) * | 2019-12-23 | 2020-04-14 | 张小飞 | Fine chemical product purification equipment |
| CN111001365B (en) * | 2019-12-23 | 2021-08-24 | 甘肃金川恒信高分子科技有限公司 | Fine chemical product purification equipment |
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Granted publication date: 20180619 Termination date: 20191017 |