CN112629171A - Preparation and processing technology of cosmetic freeze-dried essence - Google Patents
Preparation and processing technology of cosmetic freeze-dried essence Download PDFInfo
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- CN112629171A CN112629171A CN202110092244.7A CN202110092244A CN112629171A CN 112629171 A CN112629171 A CN 112629171A CN 202110092244 A CN202110092244 A CN 202110092244A CN 112629171 A CN112629171 A CN 112629171A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/06—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
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- Life Sciences & Earth Sciences (AREA)
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- Drying Of Solid Materials (AREA)
- Cosmetics (AREA)
Abstract
The invention relates to a preparation and processing technology of a cosmetic freeze-drying essence, which comprises a bottom plate, a freeze-drying device and a sealing end cover, wherein the freeze-drying device is arranged in the middle of the upper end of the bottom plate and is of a rectangular structure, open grooves are symmetrically formed in the outer side of the freeze-drying device, and the sealing end cover is arranged on the open grooves through screws. The invention can solve the problems that the existing equipment can not effectively collect vapor generated by sublimation when the frozen mixed liquid is subjected to sublimation drying, the vapor is easy to gather, the gathered water drops are easy to drip into the dried powder, and secondary pollution is easy to cause to the powder, and meanwhile, the existing equipment has poor heating effect and uneven heating when the frozen mixed liquid is subjected to sublimation drying, can not effectively heat a medicine bottle, and influences the subsequent preparation effect of freeze-drying essence.
Description
Technical Field
The invention relates to the field of cosmetic processing, in particular to a preparation and processing technology of a cosmetic freeze-dried essence.
Background
The freeze-dried essence is bioactive protein essence which is prepared by quickly freeze-drying a water agent containing a large amount of biological factors into powder at extremely low temperature and compounding high-purity plant essence to excite activity when in use. The biological active protein has high requirement on environment, the high-concentration biological factors can be easily inactivated when being stored at normal temperature, and in order to ensure the special activity and function of the rare components, only a biological freeze-drying process can be adopted, and the activity is maintained in the form of freeze-dried powder.
At present, the existing freeze-dried essence generally has the following defects in the preparation process: 1. when the existing equipment is used for carrying out sublimation drying on the frozen mixed liquid, water vapor generated by sublimation cannot be effectively collected, the water vapor is easy to aggregate, and the aggregated water drops are easy to drip into the dried powder, so that secondary pollution is easy to cause to the powder; 2. when the mixed liquid after freezing is subjected to sublimation drying by the conventional equipment, the heating effect is poor, the heating is not uniform, the medicine bottle cannot be effectively heated, and the subsequent preparation effect of freeze-drying essence is influenced.
Disclosure of Invention
Technical problem to be solved
The invention can solve the problems that the existing equipment can not effectively collect vapor generated by sublimation when the frozen mixed liquid is subjected to sublimation drying, the vapor is easy to gather, the gathered water drops are easy to drip into the dried powder, and secondary pollution is easy to cause to the powder, and meanwhile, the existing equipment has poor heating effect and uneven heating when the frozen mixed liquid is subjected to sublimation drying, can not effectively heat a medicine bottle, and influences the subsequent preparation effect of freeze-drying essence.
(II) technical scheme
In order to achieve the purpose, the invention adopts the following technical scheme that the preparation and processing technology of the cosmetic freeze-dried essence adopts the following processing equipment, the processing equipment comprises a bottom plate, a freeze-drying device and a sealing end cover, the middle part of the upper end of the bottom plate is provided with the freeze-drying device, the freeze-drying device is in a rectangular structure, the outer side of the freeze-drying device is symmetrically provided with open slots, and the sealing end cover is arranged on the open slots through screws.
The freeze-drying device comprises a shell frame, a condensation mechanism, a moving mechanism, a bearing mechanism, electric connecting posts and a partition plate, wherein the shell frame is installed in the middle of the upper end of a bottom plate, the shell frame is of a rectangular hollow structure, the partition plate is arranged in the middle of the interior of the shell frame, cavities are symmetrically arranged on the outer side of the partition plate, the condensation mechanism is installed in each cavity, empty grooves are uniformly formed between the condensation mechanism and the shell frame, the moving mechanism is installed in each empty groove, the bearing mechanism is installed between the upper ends of the moving mechanisms, the electric connecting posts are uniformly installed on the outer sides of the partition plate and correspond to the bearing mechanism, through grooves are uniformly formed in the middle of the partition plate and communicated with the cavities, a vacuum-pumping tube communicated with the through grooves is installed in the middle of the upper end of the shell frame, when the freeze-dried medicine bottle is taken out and put into the upper, through the vacuum pump to the inside evacuation of casing frame, then, the hot plate heats the medicine bottle to the temperature, and the moisture in the mixed liquid directly rises by solid state and hua is vapor, and condensation mechanism can collect the condensation to vapor effectively, and it is inside to drip the medicine bottle after avoiding the vapor gathering.
Bearing mechanism including bearing bracket, hot plate, bearing plate and connect the electric plug, bearing bracket cross-section be U type structure, the bearing bracket lower extreme is connected with moving mechanism through joint complex mode, the inside middle part of bearing bracket is provided with the hot plate, the hot plate top is provided with the bearing plate, the bearing plate is installed on bearing bracket, the bearing bracket right side is provided with connects the electric plug, connect the electric plug and connect the electric post to cooperate, concrete during operation, the bearing plate can carry out the bearing to the medicine lower extreme, the medicine bottle of being convenient for is carried, the hot plate can heat the sublimation to the mixed liquid after freezing effectively, and then can dry mixed liquid effectively, the rationalization nature and the biological property of avoiding the plant essence change, it is less to the damage of essence structure and characteristic.
The hot plate include heating ring and connecting rod, the inside heating ring that evenly is provided with of support bracket, be connected through the connecting rod between the adjacent heating ring, constitute honeycomb network structure between the heating ring, concrete during operation, honeycomb structure heating ring's heating is effectual, the heating is even, guarantees that mixed liquid can thermally equivalent, does benefit to the coolant liquid sublimation.
The preparation and processing technology of the cosmetic freeze-dried essence comprises the following steps:
s1, mixing the raw materials: proportionally stirring and mixing cosmetic raw materials to be processed, and preparing a mixed solution in a filtration sterilization mode;
s2, filling and processing: uniformly subpackaging the mixed solution obtained in the step S1 into medicine bottles;
s3, freezing and cooling: uniformly placing the medicine bottles filled with the liquid medicine in the step S2 on the upper end of a supporting mechanism, and placing the medicine bottles into a freezing chamber through the supporting mechanism to cool to-40 ℃;
s4, sublimation drying: put into the moving mechanism upper end after taking out the medicine bottle after freezing in step S3 through bearing mechanism, moving mechanism drives bearing mechanism and moves inside the casing frame, later with end cover and casing frame tip sealing connection through the screw, through the inside evacuation of vacuum pump to the casing frame, then, the hot plate heats the medicine bottle to 35 ℃, the moisture in the mixed liquid directly rises hua by solid state and is vapor, condensation mechanism can collect the condensation to vapor effectively, it is inside to drip the medicine bottle after avoiding the vapor gathering.
Preferably, condensation mechanism include condensation frame, condenser pipe, feed liquor pipe and fluid-discharge tube, casing frame inside evenly install the condensation frame, the condenser pipe is evenly installed to condensation frame inside, the feed liquor pipe is installed to casing frame right side lower extreme, the fluid-discharge tube is installed to casing frame left side lower extreme, the feed liquor pipe is connected with the condenser pipe respectively with the fluid-discharge tube inboard, concrete during operation, the condensate is inside through the feed liquor pipe entering into the condenser pipe, the condenser pipe can condense the vapor after the sublimation, be convenient for the collection of vapor, prevent that vapor from taking place accumulational phenomenon, avoid the vapor of condensation to drip in the medicine bottle, prevent the powder secondary pollution after the drying.
Preferably, moving mechanism include leading truck, electronic slider and removal frame, the casing frame inner wall on the symmetry install the leading truck, the leading truck cross-section is L type structure, install electronic slider on the leading truck, be provided with on the electronic slider and remove the frame, remove the frame upper end and be provided with the draw-in groove, the bearing mechanism lower extreme is installed in the draw-in groove, specific during operation, electronic slider can drive bearing mechanism reciprocating motion through removing the frame, the medicine bottle of being convenient for in the bearing mechanism is collected.
Preferably, the condensation frame be the rectangle structure, the condensation frame lower extreme is provided with the tapered slot, evenly is provided with the liquid guide groove on the terminal surface under the condensation frame, the liquid guide groove can carry the vapor of condensation effectively, prevents that vapor from piling up in condensation frame lower extreme middle part, prevents the powder secondary pollution after the water droplet is to the drying.
Preferably, the gaps between the support bracket and the heating plate are uniformly filled with heat insulation materials, and the heat insulation materials can effectively play a role in heat insulation and prevent heat loss.
Preferably, the heating ring be octagonal structure, the heating ring is made for metal copper material, the heating ring is inside to be filled with nanometer carbon ink, nanometer carbon ink is generated heat effectually, the electric heat conversion efficiency is high, has advantages such as energy-efficient, pollution-free simultaneously.
Preferably, the bearing plate on evenly be provided with the counter bore, the bearing plate is made for the heat conduction material, the bearing plate lower extreme is hugged closely with the hot plate, the counter bore can carry on spacingly effectively to the medicine bottle, prevents that the medicine bottle from taking place the phenomenon of rocking, the bearing plate can radiate the heat that the heating ring produced effectively simultaneously, guarantees the heating effect of freezing back medicine bottle.
(III) advantageous effects
1. According to the preparation and processing technology of the cosmetic freeze-drying essence, the condensation mechanism can effectively condense water vapor generated by sublimation, so that the phenomenon that the water vapor is easy to gather is prevented, and meanwhile, gathered water drops can be conveyed, so that the situation that the water drops drop into dried powder to cause secondary pollution to the powder is avoided;
2. according to the preparation and processing technology of the cosmetic freeze-drying essence, the supporting mechanism can effectively support the medicine bottle, the medicine bottle is prevented from shaking, the medicine bottle is convenient to transport, and meanwhile, the processed medicine bottle is convenient to collect manually;
3. according to the preparation and processing technology of the cosmetic freeze-drying essence, the heating plate can effectively heat the frozen mixed liquid, so that the water in the frozen mixed liquid is convenient to sublimate, the heating effect is good, the heating is uniform, and the preparation and processing technology has the advantages of high efficiency, energy conservation, no pollution and the like.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is a schematic cross-sectional view of the bottom plate and the freeze-drying device according to the present invention;
FIG. 4 is a schematic cross-sectional view of the housing frame, the condensing mechanism, the moving mechanism and the supporting mechanism of the present invention;
FIG. 5 is a schematic view of a first cross-sectional configuration of the present invention support mechanism;
fig. 6 is a schematic view of a second cross-sectional configuration of the present invention support mechanism.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1 to 6, a preparation and processing technology of cosmetic freeze-drying essence adopts the following processing equipment, and the processing equipment comprises a bottom plate 1, a freeze-drying device 2 and a sealing end cover 3, wherein the freeze-drying device 2 is arranged in the middle of the upper end of the bottom plate 1, the freeze-drying device 2 is of a rectangular structure, open grooves are symmetrically arranged on the outer sides of the freeze-drying device 2, and the sealing end cover 3 is arranged on the open grooves through screws.
The freeze-drying device 2 comprises a shell frame 21, a condensing mechanism 22, a moving mechanism 23, a bearing mechanism 24, an electric connecting column 25 and a partition plate 26, wherein the middle part of the upper end of the bottom plate 1 is provided with the shell frame 21, the shell frame 21 is of a rectangular hollow structure, the middle part inside the shell frame 21 is provided with the partition plate 26, cavities are symmetrically arranged outside the partition plate 26, the condensing mechanism 22 is arranged inside the cavities, empty grooves are uniformly formed between the condensing mechanism 22 and the shell frame 21, the moving mechanism 23 is arranged in the empty grooves, the bearing mechanism 24 is arranged between the upper ends of the moving mechanism 23, the electric connecting column 25 is uniformly arranged outside the partition plate 26, the electric connecting column 25 corresponds to the bearing mechanism 24, the middle part of the partition plate 26 is uniformly provided with through grooves, the through grooves are communicated with the cavities, the middle part of the upper end of the shell frame 21 is provided with, inside moving mechanism 23 drove supporting mechanism 24 and moved casing frame 21, later through screw with end cover 3 and casing frame 21 end sealing connection, to the inside evacuation of casing frame 21 through the vacuum pump, then, hot plate 242 heats the medicine bottle to 35 ℃, the moisture in the mixed liquid is directly risen by solid state and is the vapor, condensing mechanism 22 can collect the condensation to the vapor effectively, inside the dropping medicine bottle after avoiding the vapor gathering.
The gaps between the support bracket 241 and the heating plate 242 are uniformly filled with heat insulation materials, and the heat insulation materials can effectively play a role in heat insulation and prevent heat loss.
The heating plate 242 comprises heating rings 2421 and connecting rods 2422, the heating rings 2421 are uniformly arranged in the support bracket 241, the adjacent heating rings 2421 are connected through the connecting rods 2422, a honeycomb-shaped mesh structure is formed among the heating rings 2421, and when the heating plate works specifically, the honeycomb-shaped heating rings 2421 are good in heating effect and uniform in heating, so that mixed liquid can be uniformly heated, and sublimation of refrigerating liquid is facilitated.
The heating ring 2421 is of an octagonal structure, the heating ring 2421 is made of a metal copper material, and nano carbon ink is filled in the heating ring 2421, so that the nano carbon ink is good in heating effect and high in electrothermal conversion efficiency, and has the advantages of high efficiency, energy conservation, no pollution and the like.
Evenly be provided with the counter bore on bearing plate 243, bearing plate 243 is made for the heat conduction material, bearing plate 243 lower extreme and hot plate 242 hug closely, the counter bore can be spacing to the medicine bottle effectively, prevents that the medicine bottle from taking place the phenomenon of rocking, bearing plate 243 can dispel the heat that heating ring 2421 produced effectively simultaneously, guarantees the heating effect of freezing back medicine bottle.
The preparation and processing technology of the cosmetic freeze-dried essence comprises the following steps:
s1, mixing the raw materials: proportionally stirring and mixing cosmetic raw materials to be processed, and preparing a mixed solution in a filtration sterilization mode;
s2, filling and processing: uniformly subpackaging the mixed solution obtained in the step S1 into medicine bottles;
s3, freezing and cooling: uniformly placing the medicine bottles filled with the liquid medicine in the step S2 on the upper end of the supporting mechanism 24, and placing the medicine bottles into the freezing chamber through the supporting mechanism 24 to cool to-40 ℃;
s4, sublimation drying: put into moving mechanism 23 upper end after taking out the medicine bottle after freezing in step S3 through supporting mechanism 24, moving mechanism 23 drives supporting mechanism 24 and moves inside casing frame 21, later through screw with sealed end cover 3 and casing frame 21 end sealing connection, through the inside evacuation of vacuum pump to casing frame 21, then, hot plate 242 heats 35 ℃ to the medicine bottle, the moisture in the mixed liquid directly rises to hua by solid state is vapor, condensing mechanism 22 can collect the condensation to vapor effectively, it is inside to drip to the medicine bottle after avoiding the vapor gathering.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a preparation and processing technology of cosmetic freeze-drying essence, this preparation and processing technology of cosmetic freeze-drying essence adopts following processing equipment, and this processing equipment includes bottom plate (1), freeze-drying device (2) and end cover (3), its characterized in that: the middle part of the upper end of the bottom plate (1) is provided with a freeze-drying device (2), the freeze-drying device (2) is of a rectangular structure, open grooves are symmetrically formed in the outer side of the freeze-drying device (2), and sealing end covers (3) are arranged on the open grooves through screws; wherein:
the freeze-drying device (2) comprises a shell frame (21), a condensation mechanism (22), a moving mechanism (23), a bearing mechanism (24), an electric connecting column (25) and a partition plate (26), wherein the middle part of the upper end of the bottom plate (1) is provided with the shell frame (21), the shell frame (21) is of a rectangular hollow structure, the middle part inside the shell frame (21) is provided with the partition plate (26), cavities are symmetrically arranged on the outer side of the partition plate (26), the condensation mechanism (22) is arranged inside the cavities, empty grooves are uniformly formed between the condensation mechanism (22) and the shell frame (21), the moving mechanism (23) is arranged in the empty grooves, the bearing mechanism (24) is arranged between the upper ends of the moving mechanism (23), the electric connecting column (25) is uniformly arranged on the outer side of the partition plate (26), the electric connecting column (25) corresponds to the bearing mechanism (24), the middle part, the middle part of the upper end of the shell frame (21) is provided with a vacuum-pumping pipe communicated with the through groove;
the supporting mechanism (24) comprises a supporting bracket (241), a heating plate (242), a supporting plate (243) and an electric plug (244), the cross section of the supporting bracket (241) is of a U-shaped structure, the lower end of the supporting bracket (241) is connected with the moving mechanism (23) in a clamping fit mode, the heating plate (242) is arranged in the middle of the inside of the supporting bracket (241), the supporting plate (243) is arranged above the heating plate (242), the supporting plate (243) is installed on the supporting bracket (241), the electric plug (244) is arranged on the right side of the supporting bracket (241), and the electric plug (244) is matched with the electric post (25);
the heating plate (242) comprises heating rings (2421) and connecting rods (2422), the heating rings (2421) are uniformly arranged in the support bracket (241), adjacent heating rings (2421) are connected through the connecting rods (2422), and a honeycomb-shaped mesh structure is formed between the heating rings (2421);
the preparation and processing technology of the cosmetic freeze-dried essence comprises the following steps:
s1, mixing the raw materials: proportionally stirring and mixing cosmetic raw materials to be processed, and preparing a mixed solution in a filtration sterilization mode;
s2, filling and processing: uniformly subpackaging the mixed solution obtained in the step S1 into medicine bottles;
s3, freezing and cooling: uniformly placing the medicine bottles filled with the liquid medicine in the step S2 on the upper end of a supporting mechanism (24), and placing the medicine bottles into a freezing chamber through the supporting mechanism (24) to cool to-40 ℃;
s4, sublimation drying: the medicine bottle frozen in the step S3 is taken out through the supporting mechanism (24) and then put into the upper end of the moving mechanism (23), the moving mechanism (23) drives the supporting mechanism (24) to move into the shell frame (21), the sealing end cover (3) is connected with the end part of the shell frame (21) in a sealing mode through screws, the shell frame (21) is vacuumized through a vacuum pump, then the heating plate (242) heats the medicine bottle to 35 ℃, water in the mixed liquid is directly sublimated into water vapor from a solid state, the condensing mechanism (22) can effectively collect and condense the water vapor, and the water vapor is prevented from being collected and then drips into the medicine bottle.
2. The preparation and processing technology of the cosmetic freeze-dried essence according to claim 1, characterized in that: condensation mechanism (22) include condensation frame (221), condenser pipe (222), feed liquor pipe (223) and fluid-discharge tube (224), casing frame (21) inside evenly installed condensation frame (221), inside evenly installed condenser pipe (222) of condensation frame (221), feed liquor pipe (223) are installed to casing frame (21) right side lower extreme, fluid-discharge tube (224) are installed to casing frame (21) left side lower extreme, feed liquor pipe (223) are connected with condenser pipe (222) respectively with fluid-discharge tube (224) inboard.
3. The preparation and processing technology of the cosmetic freeze-dried essence according to claim 1, characterized in that: moving mechanism (23) including leading truck (231), electronic slider (232) and removal frame (233), casing frame (21) inner wall on the symmetry install leading truck (231), leading truck (231) cross-section is L type structure, install electronic slider (232) on leading truck (231), be provided with on electronic slider (232) and remove frame (233), remove frame (233) upper end and be provided with the draw-in groove, bearing mechanism (24) lower extreme is installed in the draw-in groove.
4. The preparation and processing technology of the cosmetic freeze-dried essence according to claim 2, characterized in that: condensation frame (221) be the rectangle structure, condensation frame (221) lower extreme is provided with the bell jar, evenly is provided with the liquid guide groove on condensation frame (221) lower extreme terminal surface.
5. The preparation and processing technology of the cosmetic freeze-dried essence according to claim 1, characterized in that: and heat insulation materials are uniformly filled in gaps between the support bracket (241) and the heating plate (242).
6. The preparation and processing technology of the cosmetic freeze-dried essence according to claim 1, characterized in that: the heating ring (2421) is of an octagonal structure, the heating ring (2421) is made of a metal copper material, and nano carbon ink is filled in the heating ring (2421).
7. The preparation and processing technology of the cosmetic freeze-dried essence according to claim 1, characterized in that: the bearing plate (243) is uniformly provided with counter bores, the bearing plate (243) is made of heat conducting materials, and the lower end of the bearing plate (243) is tightly attached to the heating plate (242).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110092244.7A CN112629171A (en) | 2021-01-23 | 2021-01-23 | Preparation and processing technology of cosmetic freeze-dried essence |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110092244.7A CN112629171A (en) | 2021-01-23 | 2021-01-23 | Preparation and processing technology of cosmetic freeze-dried essence |
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| Publication Number | Publication Date |
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| CN112629171A true CN112629171A (en) | 2021-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110092244.7A Withdrawn CN112629171A (en) | 2021-01-23 | 2021-01-23 | Preparation and processing technology of cosmetic freeze-dried essence |
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| Country | Link |
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| CN (1) | CN112629171A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115183540A (en) * | 2022-08-18 | 2022-10-14 | 四川发展环境科学技术研究院有限公司 | Equipment for preparing dry powder containing anaerobic ammonium oxidation bacteria |
| CN115682646A (en) * | 2022-11-22 | 2023-02-03 | 中玉制药(海口)有限公司 | Diclofenac sodium lidocaine freeze-drying equipment for injection and preparation method thereof |
-
2021
- 2021-01-23 CN CN202110092244.7A patent/CN112629171A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115183540A (en) * | 2022-08-18 | 2022-10-14 | 四川发展环境科学技术研究院有限公司 | Equipment for preparing dry powder containing anaerobic ammonium oxidation bacteria |
| CN115183540B (en) * | 2022-08-18 | 2023-08-25 | 四川发展环境科学技术研究院有限公司 | Anaerobic ammonia oxidizing bacteria-containing dry powder preparation equipment |
| CN115682646A (en) * | 2022-11-22 | 2023-02-03 | 中玉制药(海口)有限公司 | Diclofenac sodium lidocaine freeze-drying equipment for injection and preparation method thereof |
| CN115682646B (en) * | 2022-11-22 | 2024-05-14 | 中玉制药(海口)有限公司 | Diclofenac sodium lidocaine freeze-drying equipment for injection and preparation method thereof |
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Application publication date: 20210409 |