CN110841329A - Tea polyphenol extraction equipment based on contain tea daily use chemicals technology - Google Patents
Tea polyphenol extraction equipment based on contain tea daily use chemicals technology Download PDFInfo
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- CN110841329A CN110841329A CN201911334382.0A CN201911334382A CN110841329A CN 110841329 A CN110841329 A CN 110841329A CN 201911334382 A CN201911334382 A CN 201911334382A CN 110841329 A CN110841329 A CN 110841329A
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- carbon dioxide
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- 238000000605 extraction Methods 0.000 title claims abstract description 82
- 235000013824 polyphenols Nutrition 0.000 title claims abstract description 35
- 150000008442 polyphenolic compounds Chemical class 0.000 title claims abstract description 34
- 239000000126 substance Substances 0.000 title claims abstract description 28
- 241001122767 Theaceae Species 0.000 title claims abstract 24
- 238000005516 engineering process Methods 0.000 title claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 37
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 37
- 239000000284 extract Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 62
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 235000013616 tea Nutrition 0.000 description 43
- 244000269722 Thea sinensis Species 0.000 description 41
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 235000020542 functional tea Nutrition 0.000 description 3
- DATAGRPVKZEWHA-YFKPBYRVSA-N N(5)-ethyl-L-glutamine Chemical compound CCNC(=O)CC[C@H]([NH3+])C([O-])=O DATAGRPVKZEWHA-YFKPBYRVSA-N 0.000 description 2
- 206010028980 Neoplasm Diseases 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 235000006708 antioxidants Nutrition 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 239000006071 cream Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035790 physiological processes and functions Effects 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 208000024172 Cardiovascular disease Diseases 0.000 description 1
- CITFYDYEWQIEPX-UHFFFAOYSA-N Flavanol Natural products O1C2=CC(OCC=C(C)C)=CC(O)=C2C(=O)C(O)C1C1=CC=C(O)C=C1 CITFYDYEWQIEPX-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 102000003425 Tyrosinase Human genes 0.000 description 1
- 108060008724 Tyrosinase Proteins 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 150000001765 catechin Chemical class 0.000 description 1
- ADRVNXBAWSRFAJ-UHFFFAOYSA-N catechin Natural products OC1Cc2cc(O)cc(O)c2OC1c3ccc(O)c(O)c3 ADRVNXBAWSRFAJ-UHFFFAOYSA-N 0.000 description 1
- 235000005487 catechin Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 235000006694 eating habits Nutrition 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 150000002206 flavan-3-ols Chemical class 0.000 description 1
- 235000011987 flavanols Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 235000009569 green tea Nutrition 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- -1 polyphenol compounds Chemical class 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003815 supercritical carbon dioxide extraction Methods 0.000 description 1
- 229940026510 theanine Drugs 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/02—Solvent extraction of solids
- B01D11/0203—Solvent extraction of solids with a supercritical fluid
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
The invention relates to the technical field of tea-containing daily chemical product processes, in particular to tea polyphenol extraction equipment based on a tea-containing daily chemical product process. The device comprises an extraction tank and a supercritical carbon dioxide generation device communicated with the extraction tank, wherein a plurality of extraction plates which are used for containing an extract to be extracted and are provided with a plurality of through holes and a chain plate type conveyor belt which is used for adjusting the position of the extraction plates and is vertically arranged in the extraction tank are arranged in the extraction tank; the driving belt of the chain plate type conveying belt is composed of a plurality of chain plates, a portal frame is vertically arranged on each chain plate, and the extracting plate is hinged to the portal frame through a connecting piece. According to the invention, a large amount of the extract to be extracted is divided into small parts to be respectively extracted, and the position of each part of the extract to be extracted is continuously changed, so that the contact degree and contact uniformity of the extract to be extracted and supercritical carbon dioxide are improved, and the extraction rate can be effectively improved.
Description
Technical Field
The invention relates to the technical field of tea-containing daily chemical product processes, in particular to tea polyphenol extraction equipment based on a tea-containing daily chemical product process.
Background
In recent years, with the increasing demand of people for material life, the consciousness of pursuing health and nature of many consumers is continuously improved, people are turning to green and healthy in clothes and eating habits, the victory activity of tea components such as green tea catechins is increasingly researched, related research reports are published, and great attention of consumers to functional tea natural materials is attracted.
Tea polyphenol is the general name of more than 30 polyphenol compounds in tea and is the main effective component of tea. The content of tea polyphenol in tea is 15% -20%, mainly contains flavanols, is a novel antioxidant, and is known as an extraction substance which is important to human beings in the 21 st century by many experts. The research shows that the tea polyphenol has various physiological functions, not only is a good natural antioxidant, but also has various physiological functions of enhancing the body resistance, preventing cancers, resisting tumors, resisting radiation, inhibiting bacteria, resisting viruses, reducing blood sugar, reducing blood fat, preventing cardiovascular diseases, resisting aging, preventing skin ultraviolet injury and the like. The tea polyphenol has wide application prospect in the fields of grease, food, medicine, daily chemical industry, light chemical industry and the like.
The company takes tea polyphenol as a raw material to carry out formula research, stability test and quality detection, and develops the tea cream. Aiming at the problem that tea-containing face cream and the like are easy to discolor and have unobtrusive functions in shelf life, functional tea ingredients with high tyrosinase inhibition rate and good color stability are screened, the stability and the slow-release effect of the functional tea ingredients are improved by an embedding technology, and the technical bottleneck of application of tea polyphenol and the like in the field of cosmetics is solved. Tea polyphenol and theanine are used as raw materials, formula research, stability test and quality detection are carried out, and the tea-containing water-retaining exquisite facial mask is developed. A set of daily chemical products containing tea is developed by taking the tea extract as a raw material, and can be used for cleaning, nursing and maintaining the skin. The raw materials of the series of tea-containing daily chemical products and the tea-containing daily chemical products can be used for industrial mass production, so that the safe and effective extraction and separation of tea polyphenol from tea has important significance.
Disclosure of Invention
The invention aims to solve the problems and provides tea polyphenol extraction equipment based on a tea-containing daily chemical product process.
The technical scheme for solving the problems is that the tea polyphenol extraction equipment based on the tea-containing daily chemical product process comprises an extraction tank and a supercritical carbon dioxide generation device communicated with the extraction tank, wherein a plurality of extraction plates which are used for containing the extract to be extracted and are provided with a plurality of through holes and a chain plate type conveyor belt which is used for adjusting the positions of the extraction plates and is vertically arranged in the extraction tank are arranged in the extraction tank; the driving belt of the chain plate type conveying belt is composed of a plurality of chain plates, a portal frame is vertically arranged on each chain plate, and the extracting plate is hinged to the portal frame through a connecting piece.
Preferably, the extraction tank comprises a shell with an opening arranged at the top and a top cover for movably closing the opening, and the shell or the top cover is provided with a discharge hole.
Preferably, the shell comprises a fixed outer shell barrel and a movable inner shell barrel, the bottom end of the movable inner shell barrel is connected with the output shaft of the motor through a planet wheel transmission structure, and the inner wall of the movable inner shell barrel is provided with a plurality of disturbance fans.
Preferably, an opening is formed between the shell and the top cover, a circulation channel is formed between the movable inner shell barrel and the fixed outer shell barrel, and a negative pressure fan is arranged in the circulation channel.
Preferably, the negative pressure fan is arranged on the outer wall of the movable inner shell barrel, and the negative pressure fan and the disturbance fan are respectively connected with a driving power supply arranged outside the extraction tank through electric wires arranged in the movable inner shell barrel.
Preferably, the bottom of the fixed shell barrel is provided with a supercritical carbon dioxide inlet communicated with the supercritical carbon dioxide generation device.
Preferably, the device also comprises an ethanol introducing device communicated with the extraction tank.
Preferably, the ethanol introducing device sequentially comprises an ethanol liquid storage tank and a heater, and the bottom of the extraction tank is provided with a vaporized ethanol inlet communicated with the ethanol introducing device.
Preferably, the supercritical carbon dioxide generation device comprises a carbon dioxide gas storage tank, a carbon dioxide condenser and a compression pump in sequence.
Preferably, the end of the extraction plate is provided with a partition preventing the extract to be extracted from falling.
The invention has the beneficial effects that:
1. by adopting the supercritical carbon dioxide extraction technology, the pollution of the process to the environment can be reduced, and the oxidation of tea polyphenol in the extraction process can be prevented, so that the tea polyphenol obtained by extraction has excellent quality.
2. Introducing vaporized ethanol to improve the solubility of tea polyphenols in supercritical carbon dioxide to improve the extraction rate and purity of tea polyphenols.
3. The extraction plates are arranged to divide a large amount of the to-be-extracted materials into small parts for respective extraction, so that the problem of incomplete extraction caused by less contact of the central part with supercritical carbon dioxide and ethanol in a large amount of material piles to be extracted is solved. Meanwhile, the position of the extraction plate is continuously changed through the chain plate type transmission belt, so that the problem that the extraction degree of the extracts to be extracted at different positions is different due to the fact that the content of the supercritical carbon dioxide and the ethanol is large at the position close to the inlet and small at the position far away from the inlet is solved.
4. Set up the disturbance fan, under the drive of shell section of thick bamboo in the activity, when the disturbance fan rotated near the extraction board, the wind-force of its production can blow the extract of treating on the extraction board to improve and treat the contact degree of consistency of extract and supercritical carbon dioxide and ethanol, thereby improve the extraction rate.
5. The negative pressure fan is arranged, so that the supercritical carbon dioxide and the ethanol in the extraction tank generate circulating flow, and the utilization rate of the supercritical carbon dioxide and the ethanol is improved.
Drawings
FIG. 1 is a schematic view showing a structure of an apparatus for extracting tea polyphenol based on a process of producing a tea-containing daily chemical product;
FIG. 2 is a schematic structural diagram of a chain plate of a tea polyphenol extraction device based on a tea-containing daily chemical product process;
FIG. 3 is a schematic view showing the connection between a chain plate and an extraction plate of a tea polyphenol extraction apparatus based on a process of tea-containing daily chemical products;
in the figure: the device comprises an extraction tank 1, a shell 11, a fixed outer shell barrel 111, a movable inner shell barrel 112, a planet wheel transmission structure 113, a motor 114, a disturbance fan 115, a negative pressure fan 116, a top cover 12, a supercritical carbon dioxide generation device 2, a carbon dioxide gas storage tank 21, a carbon dioxide condenser 22, a compression pump 23, an ethanol introducing device 3, an ethanol storage tank 31, a heater 32, an extraction plate 41, a connecting piece 411, a chain plate type conveyor belt 42, a chain plate 421 and a portal frame 422.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
A tea polyphenol extraction equipment based on tea-containing daily chemical product process is shown in figure 1, and comprises an extraction tank 1 and a supercritical carbon dioxide generation device 2 communicated with the extraction tank 1. Feeding the extract into extraction tank 1, introducing supercritical carbon dioxide, contacting the supercritical carbon dioxide with the extract under high pressure, controlling the pressure and temperature of the system to dissolve the extract, reducing the density of the supercritical fluid by lowering pressure or raising temperature, and completing the extraction process when tea polyphenols are separated out. The supercritical carbon dioxide generation device 2 includes a carbon dioxide gas tank 21, a carbon dioxide condenser 22, and a compression pump 23 in this order.
Meanwhile, in order to improve the solubility of tea polyphenol in supercritical carbon dioxide, ethanol is generally required to be used as an entrainer, in the application, the device further comprises an ethanol inlet device 3 communicated with the extraction tank 1, the ethanol inlet device 3 sequentially comprises an ethanol storage tank 31 and a heater 32, and the bottom of the extraction tank 1 is provided with a vaporized ethanol inlet communicated with the ethanol inlet device 3. The vaporized ethanol is adopted, and compared with the liquid ethanol used in the prior art, the effect is better.
In the conventional extraction tank, a large amount of the material to be extracted is merely stacked, which causes a problem that the material in the central portion of the material to be extracted is less contacted with supercritical carbon dioxide and ethanol in a large amount of the material to be extracted, resulting in incomplete extraction. Meanwhile, since only one inlet for the supercritical carbon dioxide to enter the extraction tank is provided, there is a problem that the extraction degree of the extract to be extracted near the inlet is high and the extraction degree of the extract to be extracted far from the inlet is low. Therefore, in the present application, the bottom of the extraction tank 1 is provided with a supercritical carbon dioxide inlet communicated with the supercritical carbon dioxide generation device 2. A plurality of extracting plates 41 which are used for accommodating the extract to be extracted and are provided with a plurality of through holes are arranged in the extracting tank 1, and chain plate type conveyor belts 42 which are used for adjusting the positions of the extracting plates 41 and are vertically arranged in the extracting tank 1 are arranged in the extracting tank 1. The contact degree of the extract to be extracted on each extraction plate 41 with the supercritical carbon dioxide and the vaporized ethanol is the same through the driving action of the chain plate type transmission belt 42, and the uniformity and the completeness of the extraction are ensured.
As shown in fig. 2, the transmission belt of the chain plate type transmission belt 42 is composed of a plurality of chain plates 421.
As shown in fig. 3, the chain plate 421 is vertically provided with a portal frame 422, and the extracting plate 41 is hinged with the portal frame 422 through a connecting member 411, so that the extracting plate 41 is kept horizontal no matter which part of the chain plate type transmission belt 42 is located.
In addition, the extraction tank 1 comprises a shell 11 with an opening arranged on the top and a top cover 12 for movably closing the opening, and the shell 11 or the top cover 12 is provided with a discharge hole. The shell 11 comprises a fixed outer shell barrel 111 and a movable inner shell barrel 112, the bottom end of the movable inner shell barrel 112 is connected with an output shaft of a motor 114 through a planet wheel transmission structure 113, and the inner wall of the movable inner shell barrel 112 is provided with a plurality of disturbance fans 115. This allows the movable inner shell 112 to rotate under the drive of the motor 114, and when the movable inner shell 112 drives the disturbing fan 115 to rotate to the vicinity of the lifting extraction plate 41, the extract to be extracted on the extraction plate 41 can be blown and turned over to improve the contact with the supercritical carbon dioxide and vaporized ethanol; when the movable inner shell 112 drives the disturbing fan 115 to rotate to the front-rear direction in fig. 1, the extracting plate 41 is lifted, and the lifting of the extracting plate 41 is not stopped by the disturbing fan 115.
Meanwhile, in order to prevent the disturbing fan 115 from blowing the extract to be extracted off the extracting plate 41, the end of the extracting plate 41 is provided with a partition preventing the extract to be extracted from falling.
An opening is arranged between the shell 11 and the top cover 12, a circulation channel can be formed between the movable inner shell 112 and the fixed outer shell barrel 111, and a negative pressure fan 116 is arranged in the circulation channel. Under the action of the negative pressure fan 116, the supercritical carbon dioxide and the vaporized ethanol which rise to the top of the extraction tank 1 can return to the bottom of the extraction tank 1 through the negative pressure fan 116, rise again to contact with the extract to be extracted, and the utilization rate of the supercritical carbon dioxide and the vaporized ethanol can be improved.
In addition, the negative pressure fan 116 is disposed on the outer wall of the movable inner shell 112, and the negative pressure fan 116 and the disturbing fan 115 are respectively connected to the driving power supply disposed outside the extraction tank 1 through the electric wire disposed in the movable inner shell 112.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a tea polyphenol draws equipment based on contain tea daily use chemicals product technology, including draw jar (1) and with draw supercritical carbon dioxide generating device (2) that jar (1) communicates, its characterized in that: a plurality of extraction plates (41) which are used for containing the extract to be extracted and are provided with a plurality of through holes and a chain plate type conveyor belt (42) which is used for adjusting the position of the extraction plates (41) and is vertically arranged in the extraction tank (1) are arranged in the extraction tank (1); the transmission belt of the chain plate type transmission belt (42) is composed of a plurality of chain plates (421), a portal frame (422) is vertically arranged on each chain plate (421), and the extracting plate (41) is hinged with the portal frame (422) through a connecting piece (411).
2. The tea polyphenol extraction equipment based on the process of tea-containing daily chemical products according to claim 1, wherein: the extraction tank (1) comprises a shell (11) with an opening arranged at the top and a top cover (12) used for movably sealing the opening, wherein a discharge hole is formed in the shell (11) or the top cover (12).
3. The tea polyphenol extraction equipment based on the process of tea-containing daily chemical products according to claim 2, wherein: the casing (11) comprises a fixed casing barrel (111) and a movable inner casing barrel (112), the bottom end of the movable inner casing barrel (112) is connected with an output shaft of a motor (114) through a planet wheel transmission structure (113), and the inner wall of the movable inner casing barrel (112) is provided with a plurality of disturbance fans (115).
4. The tea polyphenol extraction equipment based on the process of tea-containing daily chemical products according to claim 3, wherein: an opening is formed between the shell (11) and the top cover (12), a circulation channel is formed between the movable inner shell barrel (112) and the fixed outer shell barrel (111), and a negative pressure fan (116) is arranged in the circulation channel.
5. The tea polyphenol extraction equipment based on the process of tea-containing daily chemical products according to claim 4, wherein: the negative pressure fan (116) is arranged on the outer wall of the movable inner shell cylinder (112), and the negative pressure fan (116) and the disturbance fan (115) are respectively connected with a driving power supply arranged outside the extraction tank (1) through electric wires arranged in the movable inner shell cylinder (112).
6. The tea polyphenol extraction equipment based on the process of tea-containing daily chemical products according to claim 3, wherein: the bottom of the fixed shell barrel (111) is provided with a supercritical carbon dioxide inlet communicated with the supercritical dioxide generation device (2).
7. The tea polyphenol extraction equipment based on the process of tea-containing daily chemical products according to claim 1, wherein: also comprises an ethanol introducing device (3) communicated with the extraction tank (1).
8. The tea polyphenol extraction equipment based on the process of tea-containing daily chemical products according to claim 7, wherein: the ethanol introducing device (3) sequentially comprises an ethanol storage tank (31) and a heater (32), and the bottom of the extraction tank (1) is provided with a vaporized ethanol inlet communicated with the ethanol introducing device (3).
9. The tea polyphenol extraction equipment based on the process of tea-containing daily chemical products according to claim 1, wherein: the supercritical carbon dioxide generation device (2) sequentially comprises a carbon dioxide gas storage tank (21), a carbon dioxide condenser (22) and a compression pump (23).
10. The tea polyphenol extraction equipment based on the process of tea-containing daily chemical products according to claim 1, wherein: the end of the extraction plate (41) is provided with a partition plate for preventing the extract to be extracted from falling.
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CN201911334382.0A CN110841329A (en) | 2019-12-23 | 2019-12-23 | Tea polyphenol extraction equipment based on contain tea daily use chemicals technology |
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CN201911334382.0A CN110841329A (en) | 2019-12-23 | 2019-12-23 | Tea polyphenol extraction equipment based on contain tea daily use chemicals technology |
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CN201911334382.0A Withdrawn CN110841329A (en) | 2019-12-23 | 2019-12-23 | Tea polyphenol extraction equipment based on contain tea daily use chemicals technology |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111841069A (en) * | 2020-07-08 | 2020-10-30 | 湖南康易达绿茵科技有限公司 | Extraction element for bio-pharmaceuticals |
CN112920590A (en) * | 2021-02-18 | 2021-06-08 | 杨嘉怡 | Manufacturing process of household environment-friendly plastic |
-
2019
- 2019-12-23 CN CN201911334382.0A patent/CN110841329A/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111841069A (en) * | 2020-07-08 | 2020-10-30 | 湖南康易达绿茵科技有限公司 | Extraction element for bio-pharmaceuticals |
CN111841069B (en) * | 2020-07-08 | 2022-05-17 | 湖南康易达绿茵科技有限公司 | Extraction element for bio-pharmaceuticals |
CN112920590A (en) * | 2021-02-18 | 2021-06-08 | 杨嘉怡 | Manufacturing process of household environment-friendly plastic |
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Application publication date: 20200228 |