CN112316866A - DOTP plasticizer esterification reaction equipment - Google Patents
DOTP plasticizer esterification reaction equipment Download PDFInfo
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- CN112316866A CN112316866A CN202011125284.9A CN202011125284A CN112316866A CN 112316866 A CN112316866 A CN 112316866A CN 202011125284 A CN202011125284 A CN 202011125284A CN 112316866 A CN112316866 A CN 112316866A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
- B01J19/0066—Stirrers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N2001/1031—Sampling from special places
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- Sampling And Sample Adjustment (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses esterification reaction equipment for a DOTP (dioctyl-phthalate) plasticizer, which comprises a reaction kettle and a stirring device arranged in the reaction kettle, wherein a sampling device is also arranged in the reaction kettle, the sampling device comprises a sampling pipe sleeve arranged in the reaction kettle and a sampling pipe sleeved in the sampling pipe sleeve, the sampling pipe sleeve isolates sample liquid from the sampling pipe, and the sample liquid can enter the sampling pipe to be sampled only during sampling; the esterification reaction equipment for the DOTP plasticizer has the beneficial effects that: the sampling pipe sleeve isolates the sample liquid from the sampling pipe, and the sample liquid can enter the sampling pipe to be sampled only during sampling, so that the sample liquid to be sampled is ensured to be uniformly mixed and is the sample liquid to be detected, and the sampling is accurate; the sampling tube is not contacted with the sample liquid, so that the operation is convenient, and the sample liquid pollution is avoided.
Description
Technical Field
The invention belongs to the field of reaction kettle structures, and particularly relates to DOTP plasticizer esterification reaction equipment.
Background
Dioctyl terephthalate (DOTP for short) is a plasticizer with excellent performance, has good electric and thermal properties, has good acceleration effect and low volatility when being used on cable materials, is widely used for various products requiring heat resistance and high insulation, is an ideal plasticizer for producing cable materials with temperature resistance of 70 ℃ and other eyeball volatilization-resistant PVC products, has good cold resistance, and is an excellent environment-friendly plasticizer.
In the esterification reaction of the DOTP plasticizer, sample liquid sampling extraction and analysis are required to be carried out on the esterification reaction for many times, in the prior art, the operation of extracting the sample liquid in a reaction kettle generally has two modes, one mode is that the liquid drainage sampling is carried out by utilizing an outlet arranged at the lower part of the reaction kettle, the mode is not beneficial to the sealing of the reaction kettle, and the leakage problem is easy to occur; secondly, a sampling pipe is inserted into the reaction kettle for sampling, and two sampling modes are provided, wherein one sampling pipe is fixed between the sampling pipes in the reaction kettle, and a pump and the like are used for sampling, so that sample liquid in the sampling pipe is difficult to mix, and the detection is inaccurate; secondly, utilize the sampler to hang into in the appearance liquid through the rope when taking a sample, then pull out, all have appearance liquid on rope and sampler like this, the operation is inconvenient. In summary, the concentrated sampling method has various defects, which are not favorable for sampling operation.
Disclosure of Invention
The invention aims to provide DOTP plasticizer esterification reaction equipment, which solves the technical problems.
The technical scheme of the invention is that the DOTP plasticizer esterification reaction equipment comprises a reaction kettle and a stirring device arranged in the reaction kettle, wherein a sampling device is also arranged in the reaction kettle, the sampling device comprises a sampling pipe sleeve arranged in the reaction kettle and a sampling pipe sleeved in the sampling pipe sleeve, the sampling pipe sleeve isolates sample liquid from the sampling pipe, and the sample liquid can enter the sampling pipe to be sampled only during sampling.
Preferably, the sampling pipe sleeve comprises a hollow column pipe, the upper end of the hollow column pipe extends out of the top of the reaction kettle, the lower end of the hollow column pipe is fixedly connected with a hollow sampling ball, a concentric liquid storage ball is arranged in the sampling ball,
the sampling ball is provided with a first liquid taking port and a first liquid inlet which are vertical to two axes, and the liquid storage ball is provided with a second liquid taking port and a second liquid inlet which are vertical to two axes; the first liquid taking port and the second liquid taking port are coaxially sleeved, the first liquid inlet and the second liquid inlet are coaxially sleeved, and the first liquid taking port is arranged at the connecting position of the sampling ball and the hollow column tube and communicated with the hollow column tube.
Preferably, a sealing gasket is arranged between the sampling ball and the liquid storage ball, so that the sampling ball and the liquid storage ball are sealed; the diameter of the first night inlet is larger than that of the second liquid inlet, and the diameter of the first liquid taking port is larger than that of the second liquid taking port.
Preferably, an air hole is formed in the edge of the opening of the second liquid taking port in the liquid storage ball, and the air hole is communicated with the liquid storage ball and the sampling pipe sleeve.
Preferably, the sampling ball comprises an upper hemisphere and a lower hemisphere, and the upper hemisphere and the lower hemisphere are fixedly connected through a flange in a sealing manner; the bottom of the lower hemisphere is provided with a bracket, and the bracket is fixed with the inner side of the reaction kettle.
Preferably, the sampling tube comprises a hollow tube, the hollow tube is inserted into the sampling tube sleeve from the upper end of the sampling tube sleeve, and the lower end of the hollow tube extends into the liquid storage ball through the first liquid taking port and the second liquid taking port and is fixed with the liquid storage ball; the upper end of the sampling tube is connected with a rotating device and a sampling pump.
Preferably, the hollow tube comprises a connecting part and a liquid absorption part fixedly connected to the bottom end of the connecting part, the liquid absorption part is arranged in the liquid storage ball, an insertion shaft is arranged on the bottom end face of the connecting part, and the insertion shaft is inserted into the side face of the liquid storage ball arranged on the outer side of the second liquid taking port, so that the sampling tube and the liquid storage ball are fixed.
Preferably, a sealing sleeve is sleeved on the liquid suction part, and the sealing sleeve is used for tightly pressing and sealing the second liquid taking port from the outside of the liquid storage ball;
the bottom end of the liquid suction part is provided with a limiting part, the limiting part is inserted into a limiting hole which is arranged in the liquid storage ball and is coaxial with the second liquid taking port, and liquid suction holes are formed in the limiting part and the liquid suction part.
Preferably, the rotating device comprises a hand wheel disc fixed at the upper end of the sampling tube, scales are arranged on the hand wheel disc, and the scales correspond to the second liquid inlet.
Preferably, agitating unit includes the (mixing) shaft, first puddler, second puddler and third puddler have set gradually by supreme down on the (mixing) shaft, first puddler sets up to the arc pole of both ends tilt up, the second puddler sets up to the slope straight-bar, the third puddler sets up to U type pole.
The esterification reaction equipment for the DOTP plasticizer has the beneficial effects that: the sampling pipe sleeve isolates the sample liquid from the sampling pipe, and the sample liquid can enter the sampling pipe to be sampled only during sampling, so that the sample liquid to be sampled is ensured to be uniformly mixed and is the sample liquid to be detected, and the sampling is accurate; the sampling tube is not contacted with the sample liquid, so that the operation is convenient, and the sample liquid pollution is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a DOTP plasticizer esterification reaction apparatus according to the technical scheme of the present invention,
FIG. 2 is a schematic view of the structure of a sampling pipe sleeve and a sampling pipe,
figure 3 is a schematic cross-sectional view of the sampling tube of figure 2,
figure 4 is a right side view of figure 2,
FIG. 5 is a schematic view of the structure of the sampling tube sleeve and the sampling tube tip.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
As shown in FIG. 1, the DOTP plasticizer esterification reaction device in the technical scheme of the invention comprises a reaction kettle 100 and a stirring device 10 arranged in the reaction kettle 100, wherein a sampling device 20 is also arranged in the reaction kettle 100. The sampling device 20 comprises a sampling pipe sleeve 2 arranged in the reaction kettle 100 and a sampling pipe 3 sleeved in the sampling pipe sleeve 2, the sampling pipe sleeve 2 isolates sample liquid from the sampling pipe 3, and only when sampling is carried out, the sample liquid enters the sampling pipe 3 to be sampled and sampled.
Based on the technical scheme, the problem that sampling inspection accuracy is low due to the fact that sample liquid in the sampling pipe and sample liquid in the reaction kettle are not smoothly mixed when the sampling pipe which is installed in the reaction kettle for a long time is used for sampling in the prior art is solved. Still changed and utilized a stay cord to hang the sampler into reation kettle when needs sample among the prior art and take a sample in, the operator very easily takes place to go up the contact of appearance liquid or appearance liquid and remain in the outside problem that leads to the pollution with stay cord and sampler at last. In the technical scheme of the invention, the sampling pipe sleeve 2 always isolates the sample liquid from the sampling pipe 3, the sample liquid cannot enter the sampling pipe 3 or the sampling pipe sleeve 2 during normal reaction, and only part of the sample liquid enters the sampling pipe to be sampled during sampling, so that the defects in the prior art are overcome.
Referring to fig. 2, the sampling pipe sleeve 2 includes a hollow column pipe 21, the upper end of the hollow column pipe 21 extends from the top of the reaction vessel 100, the lower end is fixedly connected with a hollow sampling ball 22, and a concentric liquid storage ball 25 is arranged in the sampling ball 22. The sampling ball 22 is provided with a first liquid taking port 24 and a first liquid inlet port 23 which are perpendicular to each other on two axes. The liquid storage ball 25 is provided with a second liquid taking port 27 and a second liquid inlet port 26, both axes of which are perpendicular. The first liquid taking port 24 and the second liquid taking port 27 are coaxially sleeved, and the first night inlet 23 and the second liquid inlet 26 are coaxially sleeved. The first liquid taking port 24 is arranged at the connecting position of the sampling ball 22 and the hollow column tube 21 and is communicated with the hollow column tube 21. During sampling, the first inlet 23 and the second inlet 26 are opposite and communicated, and sample liquid enters the hollow liquid storage ball 25 through the first inlet 23 and the second inlet 26 and is sampled and drawn by the sampling tube 3 inserted through the first liquid taking port 24 and the second liquid taking port 27, so that sampling is realized. During normal reaction, the first night inlet 23 is not communicated with the second liquid inlet 26, so that the reactant or the sample liquid does not enter the liquid storage ball 25 and the sampling tube 3, and the unreacted reactant or the incompletely reacted reactant does not remain in the liquid storage ball 25 and the sampling tube 3, thereby ensuring the completeness of the reaction and the standard of the sample liquid.
A sealing gasket is arranged between the sampling ball 22 and the liquid storage ball 25, so that the sampling ball and the liquid storage ball are sealed, and the sample liquid cannot enter between the sampling ball 22 and the liquid storage ball 25. The diameter of the first night inlet 23 is larger than that of the second liquid inlet 26, the diameter of the first liquid taking port 24 is larger than that of the second liquid taking port 27, and the sample liquid is prevented from entering between the sampling ball 22 and the liquid storage ball 25.
As shown in FIG. 3, an air hole 28 is provided at the edge of the second liquid taking port 27 of the liquid storing ball 25, and the air hole 28 communicates the liquid storing ball 25 and the sampling tube holder 31. When sampling and extracting the sample liquid, the sample liquid in the liquid storage ball 25 is pumped away, the pressure is reduced, so that gas needs to be supplemented into the liquid storage ball for normal extraction of the sample liquid, at the moment, air enters from the upper end of the sampling pipe sleeve 31 and enters the liquid storage ball 25 through the air hole 28, the pressure in the liquid storage ball 25 is ensured, and the sample liquid is conveniently and completely pumped away.
As shown in fig. 4, the sampling ball 22 includes an upper hemisphere 221 and a lower hemisphere 222, and the upper hemisphere 221 and the lower hemisphere 222 are hermetically fixed by a flange 223. The bottom of the lower hemisphere 222 is provided with a bracket 40, and the bracket 40 is fixed with the inner side of the reaction kettle 100. The bracket is arranged to facilitate the fixing of the sampling ball 22 and the fixing and balancing of the sampling pipe sleeve 2.
Referring to fig. 3, the sampling tube 3 comprises a hollow tube, which is inserted into the sampling tube housing 2 from the upper end of the sampling tube housing 2, and the lower end of the hollow tube extends into the liquid storage ball 25 through the first liquid taking port 24 and the second liquid taking port 27 and is fixed with the liquid storage ball 25. The upper end of the sampling tube 3 is connected with a rotating device 50 and a sampling pump 60. The rotating device 50 drives the sampling tube 3 and the liquid storage ball 25 to rotate, the second inlet 26 is exposed from the first inlet 23, the sample liquid enters the liquid storage ball 25, then the sampling tube 3 and the liquid storage ball 25 rotate again, the second inlet 26 is separated from the first inlet 23 and is sealed, and then the sampling pump 60 pumps the sample liquid in the liquid storage ball 25 to realize sampling. In the normal esterification reaction, the second inlet 26 is kept separated from the first inlet 23 and sealed to prevent the reaction product or sample liquid from remaining in the liquid storage ball 25.
As shown in fig. 2 and 3, the hollow tube includes a connecting portion 31 and a liquid absorbing portion 32 fixed to a bottom end of the connecting portion 31, and the liquid absorbing portion 32 is disposed in the liquid storage ball 25. The bottom end face of the connecting part 31 is provided with an inserting shaft 33, and the inserting shaft 33 is inserted on the side face of the liquid storage ball 25 arranged outside the second liquid taking port 27 to realize the fixation of the sampling tube 3 and the liquid storage ball 25. So that the sampling tube 3 drives the liquid storage ball 25 to rotate.
As shown in fig. 2, a sealing sleeve 34 is sleeved on the liquid suction portion 32, and the sealing sleeve 34 is used for tightly sealing the second liquid taking port 27 from the outside of the liquid storage ball 25. The bottom end of the liquid absorbing part 32 is provided with a limiting part 35, and the limiting part 35 is inserted in a limiting hole which is arranged in the liquid storage ball 25 and is coaxial with the second liquid taking port 27. The stopper 35 and the liquid absorbing part 32 are provided with liquid absorbing holes 36. The sample liquid in the liquid storage ball 25 enters the sampling tube 3 from the liquid suction hole 36 to be sampled.
The rotating device 50 comprises a handwheel disc fixed at the upper end of the sampling tube 3, and scales are arranged on the handwheel disc, and the positions of the scales correspond to the positions of the second liquid inlet 26. As shown in fig. 1, the stirring device 10 includes a stirring shaft 11, and a first stirring rod 12, a second stirring rod 13 and a third stirring rod 14 are sequentially disposed on the stirring shaft 11 from bottom to top. The first stirring rod 12 is an arc-shaped rod with two upwards inclined ends, the second stirring rod 13 is an inclined straight rod, and the third stirring rod 14 is a U-shaped rod. This agitating unit's setting improves stirring efficiency.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art and related arts based on the embodiments of the present invention without any creative effort, shall fall within the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.
Claims (10)
1. The utility model provides a DOTP plasticizer esterification reaction equipment, includes reation kettle, arranges the agitating unit in reation kettle, its characterized in that, still be provided with sampling device in the reation kettle, sampling device establishes the sampling tube in the sampling tube cover including the sample pipe box and the cover of arranging in reation kettle, sample liquid and sampling tube are kept apart to the sample pipe box, and only when taking a sample, just the sample liquid can get into the sampling tube and be taken a sample.
2. The esterification reaction equipment of a DOTP plasticizer according to claim 1, wherein the sampling pipe sleeve comprises a hollow column pipe, the upper end of the hollow column pipe extends out of the top of the reaction kettle, the lower end of the hollow column pipe is fixedly connected with a hollow sampling ball, a concentric liquid storage ball is arranged in the sampling ball,
the sampling ball is provided with a first liquid taking port and a first liquid inlet which are vertical to two axes, and the liquid storage ball is provided with a second liquid taking port and a second liquid inlet which are vertical to two axes; the first liquid taking port and the second liquid taking port are coaxially sleeved, the first liquid inlet and the second liquid inlet are coaxially sleeved, and the first liquid taking port is arranged at the connecting position of the sampling ball and the hollow column tube and communicated with the hollow column tube.
3. The esterification reaction equipment of a DOTP plasticizer according to claim 2, wherein a sealing gasket is provided between the sampling ball and the liquid storage ball to realize sealing between the sampling ball and the liquid storage ball; the diameter of the first night inlet is larger than that of the second liquid inlet, and the diameter of the first liquid taking port is larger than that of the second liquid taking port.
4. The esterification reaction equipment of a DOTP plasticizer according to claim 2, wherein an air hole is formed at the edge of the opening part of the second liquid taking port on the liquid storage ball, and the air hole is communicated with the liquid storage ball and the sampling pipe sleeve.
5. The esterification reaction equipment of a DOTP plasticizer according to claim 2, wherein the sampling sphere comprises an upper hemisphere and a lower hemisphere, and the upper hemisphere and the lower hemisphere are hermetically and fixedly connected through a flange; the bottom of the lower hemisphere is provided with a bracket, and the bracket is fixed with the inner side of the reaction kettle.
6. The DOTP plasticizer esterification reaction equipment according to claim 1, wherein the sampling tube comprises a hollow tube, the hollow tube is inserted into the sampling tube sleeve from the upper end of the sampling tube sleeve, and the lower end of the hollow tube extends into the liquid storage ball through the first liquid taking port and the second liquid taking port and is fixed with the liquid storage ball; the upper end of the sampling tube is connected with a rotating device and a sampling pump.
7. The DOTP plasticizer esterification reaction equipment according to claim 6, wherein the hollow tube comprises a connecting portion and a liquid absorption portion fixedly connected to the bottom end of the connecting portion, the liquid absorption portion is disposed in the liquid storage ball, an insertion shaft is disposed on the bottom end face of the connecting portion, and the insertion shaft is inserted into the side face of the liquid storage ball disposed outside the second liquid taking port, so that the sampling tube and the liquid storage ball are fixed.
8. The DOTP plasticizer esterification reaction equipment according to claim 7, wherein a sealing sleeve is sleeved on the liquid absorption part, and the sealing sleeve compresses and seals the second liquid taking port from the outside of the liquid storage ball;
the bottom end of the liquid suction part is provided with a limiting part, the limiting part is inserted into a limiting hole which is arranged in the liquid storage ball and is coaxial with the second liquid taking port, and liquid suction holes are formed in the limiting part and the liquid suction part.
9. The DOTP plasticizer esterification reaction equipment according to claim 6, wherein the rotating device comprises a hand wheel disc fixed on the upper end of the sampling tube, the hand wheel disc is provided with scales, and the scales correspond to the second liquid inlet.
10. The DOTP plasticizer esterification reaction equipment according to claim 1, wherein the stirring device comprises a stirring shaft, a first stirring rod, a second stirring rod and a third stirring rod are sequentially arranged on the stirring shaft from bottom to top, the first stirring rod is an arc-shaped rod with two upwards inclined ends, the second stirring rod is an inclined straight rod, and the third stirring rod is a U-shaped rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011125284.9A CN112316866B (en) | 2020-10-20 | 2020-10-20 | DOTP plasticizer esterification reaction equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011125284.9A CN112316866B (en) | 2020-10-20 | 2020-10-20 | DOTP plasticizer esterification reaction equipment |
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| Publication Number | Publication Date |
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| CN112316866A true CN112316866A (en) | 2021-02-05 |
| CN112316866B CN112316866B (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011125284.9A Active CN112316866B (en) | 2020-10-20 | 2020-10-20 | DOTP plasticizer esterification reaction equipment |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419136A (en) * | 2008-04-08 | 2009-04-29 | 北京矿冶研究总院 | Adjustable pneumatic ore pulp pipeline sampler |
| CN202351085U (en) * | 2011-12-09 | 2012-07-25 | 东南大学 | Displacement-adjustable connection sampling device for crude oil transportation pipeline |
| CN203965192U (en) * | 2014-07-01 | 2014-11-26 | 淄博市临淄齐美特工贸有限公司 | A kind of enclosed sampling apparatus |
| CN206996596U (en) * | 2017-07-26 | 2018-02-13 | 浙江弘博新材料科技有限公司 | A kind of esterifying kettle for being used to produce DOP |
| CN210136096U (en) * | 2019-03-19 | 2020-03-10 | 四川出入境检验检疫局检验检疫技术中心 | Deep positioning sampling device for powder |
-
2020
- 2020-10-20 CN CN202011125284.9A patent/CN112316866B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419136A (en) * | 2008-04-08 | 2009-04-29 | 北京矿冶研究总院 | Adjustable pneumatic ore pulp pipeline sampler |
| CN202351085U (en) * | 2011-12-09 | 2012-07-25 | 东南大学 | Displacement-adjustable connection sampling device for crude oil transportation pipeline |
| CN203965192U (en) * | 2014-07-01 | 2014-11-26 | 淄博市临淄齐美特工贸有限公司 | A kind of enclosed sampling apparatus |
| CN206996596U (en) * | 2017-07-26 | 2018-02-13 | 浙江弘博新材料科技有限公司 | A kind of esterifying kettle for being used to produce DOP |
| CN210136096U (en) * | 2019-03-19 | 2020-03-10 | 四川出入境检验检疫局检验检疫技术中心 | Deep positioning sampling device for powder |
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| CN112316866B (en) | 2022-08-02 |
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