CN111763275A - Method for prolonging production period of polyvinyl alcohol with low alcoholysis degree - Google Patents
Method for prolonging production period of polyvinyl alcohol with low alcoholysis degree Download PDFInfo
- Publication number
- CN111763275A CN111763275A CN202010715980.9A CN202010715980A CN111763275A CN 111763275 A CN111763275 A CN 111763275A CN 202010715980 A CN202010715980 A CN 202010715980A CN 111763275 A CN111763275 A CN 111763275A
- Authority
- CN
- China
- Prior art keywords
- alcoholysis
- polyvinyl alcohol
- low
- degree
- production
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006136 alcoholysis reaction Methods 0.000 title claims abstract description 60
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 51
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 27
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 19
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 14
- 230000002035 prolonged effect Effects 0.000 claims abstract description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 45
- 239000000463 material Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000000243 solution Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- ZCHPKWUIAASXPV-UHFFFAOYSA-N acetic acid;methanol Chemical compound OC.CC(O)=O ZCHPKWUIAASXPV-UHFFFAOYSA-N 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000010413 mother solution Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- -1 construction Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
Abstract
The invention discloses a method for prolonging the production period of polyvinyl alcohol with low alcoholysis degree, wherein the polyvinyl alcohol with low alcoholysis degree is obtained by carrying out alcoholysis, crushing, liquid removal and drying on a methanol solution of polyvinyl acetate, and the production period of the polyvinyl alcohol with low alcoholysis degree can be prolonged by improving an alcoholysis unit and/or a liquid removal unit. The method of the invention only needs to simply technically modify the original production line, and is easy to implement; the method can greatly prolong the production period of the polyvinyl alcohol with low alcoholysis degree, improve the operating rate, reduce the production cost, realize stable production and easily realize the continuity of the production.
Description
Technical Field
The invention relates to the production of polyvinyl alcohol, in particular to a method for prolonging the production period of polyvinyl alcohol with low alcoholysis degree.
Background
Polyvinyl alcohol (PVA) is a polymer compound with a wide range of applications, and is used in textile, food, medicine, construction, wood processing, paper making, printing, agriculture, steel, polymer chemical industry, liquid crystal displays and other industries. The production process of PVA mainly comprises the following steps: firstly, refining and polymerizing Vinyl Acetate (VAC) to obtain a methanol solution of polyvinyl acetate (PVAC); then adding a methanol solution of polyvinyl acetate (PVAC) and a methanol solution of sodium hydroxide into a static mixer for fully mixing, and then feeding the mixture into a belt alcoholysis machine for alcoholysis to obtain solidified PVA; and finally, crushing the solidified PVA, squeezing to remove the liquid, drying and removing the solvent to obtain a finished product. The performance and use of PVA are related to its degree of alcoholysis, which is achieved mainly by adjusting the amount of base added. The PVA with alcoholysis degree lower than 94 percent is called low-alcoholysis-degree PVA, which has wide application in the aspect of non-fiber, and the low-alcoholysis-degree PVA has good biodegradability and can be used as a biodegradable material.
Because the reaction of the PVA with low alcoholysis degree is incomplete, waste liquid can be further separated out in the drying process in the dryer, the drying difficulty of the dryer is large, the effect is poor, the standard reaching rate of volatile matter is only about 80%, and the load has to be reduced in production (the maximum load is only 4.5 m)3H) to achieve the volatile index. Meanwhile, the dryer needs to be frequently stopped and cleaned, so that the production cycle of the PVA with low alcoholysis degree is about 15 days,
therefore, the existing alcoholysis method for obtaining PVA with low alcoholysis degree has short production period, reduced production capacity and increased overall production cost, and leads to reduced enterprise competitiveness. How to increase the production cycle of polyvinyl alcohol with low alcoholysis degree is a big problem which has to be faced by the PVA industry.
Disclosure of Invention
Based on the defects of the prior art, the invention provides a method for prolonging the production period of polyvinyl alcohol with low alcoholysis degree, aiming at reducing the number of times of parking and cleaning a dryer and prolonging the production period of polyvinyl alcohol products with low alcoholysis degree to about 45 days.
The invention adopts the following technical scheme for solving the technical problems:
the invention discloses a method for prolonging the production cycle of polyvinyl alcohol with low alcoholysis degree, which is obtained by carrying out alcoholysis, crushing, liquid removal and drying on a methanol solution of polyvinyl acetate, and is characterized in that: the production period of the polyvinyl alcohol with low alcoholysis degree is prolonged by improving an alcoholysis unit and/or a liquid removal unit.
Further, the improved method for the alcoholysis unit comprises the following steps: the quality concentration of the methanol solution of the polyvinyl acetate is improved, and alcoholysis technological parameters are controlled to improve the completeness of alcoholysis reaction, so that the production cycle of the polyvinyl alcohol with low alcoholysis degree is prolonged.
Further, after modification of the alcoholysis unit: the mass concentration of the methanol solution of the polyvinyl acetate is not lower than 35 percent; the sodium hydroxide solution used for alcoholysis is formed by mixing a methanol solution of sodium hydroxide and water, wherein the concentration of the sodium hydroxide is 60-90 g/L, and the mass concentration of the water is 30-40%; and during alcoholysis, the molar ratio of the sodium hydroxide to the polyvinyl acetate is 0.011-0.014.
The specific mass concentration of the methanol solution of polyvinyl acetate is determined by the type of PVA to be produced. The PVA variety model consists of two parts of polymerization degree and alcoholysis degree, for example, in the 17-92(L) variety model, 17 represents that the polymerization degree is 1700, 92 represents that the alcoholysis degree is 92%, and L represents that the product is in a sheet shape. Generally, the lower the degree of polymerization of the product, the higher the control of the mass concentration of the methanol solution of polyvinyl acetate, and vice versa, as shown in the following table:
| serial number | Variety and model | Concentration of |
| 1 | 04-88(L) | 51±1％ |
| 2 | 05-88(L) | 50±1％ |
| 3 | 13-88(L) | 39±1％ |
| 4 | 17-88(L) | 36±1％ |
| 5 | 17-92(L) | 36±1％ |
Further, the improved method of the liquid removal unit comprises the following steps: and (3) removing liquid from the crushed material through a screw extruder, and adding clear liquid to play a role in cleaning a filter screen to prevent blockage, so that the production period of the polyvinyl alcohol with low alcoholysis degree is prolonged.
Furthermore, the adding amount of the clear liquid is 900-1000L/h.
Furthermore, the clear liquid is preferably condensed liquid obtained by condensing steam generated when the material after liquid removal is dried by a dryer (namely, a drying unit), so that the material can be fully recycled.
Compared with the prior art, the invention has the beneficial effects that:
1. the method can prolong the production cycle of the polyvinyl alcohol with low alcoholysis degree from about 15 days to about 45 days, improve the operating rate, reduce the production cost, and have stable production and easy realization of continuous production.
2. The method of the invention comprises the following steps: by adjusting alcoholysis process parameters, the mixing effect of materials can be ensured, the materials can be well formed by reaction on a belt alcoholysis machine and can smoothly pass through a crushing and screw extruder, and meanwhile, the amount of waste liquid separated out from a drying unit is effectively reduced, and the drying difficulty is reduced; through adding the clear solution when the screw extruder takes off the liquid to the material after smashing, effectively avoided the jam of filter screen, reduced the cleaning cycle of screw extruder and desiccator.
3. The method is suitable for polyvinyl alcohol with different low alcoholysis degrees, and can meet the requirements of different varieties.
4. The method of the invention does not affect the indexes of the PVA product such as volatile matter, sodium acetate, methanol content and the like.
5. The method provided by the invention has the advantages that the used raw materials and equipment are conventional raw materials and equipment, the original production line can be simply technically improved and the process is adjusted, the method is safe, environment-friendly and pollution-free, and the policy and the guideline of national green, safe and environment-friendly are met.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1: production of PVA17-92 product
Mixing a methanol solution of sodium hydroxide with pure water to obtain a sodium hydroxide solution with the concentration of 80g/L and the mass concentration of 39% of water; and then feeding the mixture and a polyvinyl acetate methanol solution with the mass concentration of 35.2% into a mixer, wherein the molar ratio of sodium hydroxide to polyvinyl acetate is 0.011-0.012, fully and uniformly mixing the mixture, feeding the mixture into a belt alcoholysis machine, and carrying out alcoholysis reaction for 40 minutes at the reaction temperature of 45 +/-2 ℃ to generate blocky polyvinyl alcohol and separate out a mother solution.
Blocky polyvinyl alcohol enters a screw extruder for liquid removal after being crushed, the rotating speed of the extruder is changed by adjusting the power supply frequency of the extruder motor to control the liquid removal effect, and meanwhile, clear liquid (condensate after steam condensation generated when materials after liquid removal are dried through a dryer) is added into the screw extruder at the adding amount of 900L/h, so that the filter screen is cleaned to prevent blockage.
Drying and heat treating the deliquored polyvinyl alcohol to obtain a polyvinyl alcohol PVA17-92 product.
The normal production cycle for this product was 45 days.
The quality indexes of the produced products are comprehensively analyzed and displayed: the main quality indexes are not influenced, and the using effect of a client is not influenced.
Example 2: production of PVA17-88 product
Mixing a methanol solution of sodium hydroxide with pure water to obtain a sodium hydroxide solution with the concentration of 60g/L and the mass concentration of 32% of water; and then, feeding the mixture and a polyvinyl acetate methanol solution with the mass concentration of 35.5% into a mixer, wherein the molar ratio of sodium hydroxide to polyvinyl acetate is 0.013-0.014, fully and uniformly mixing, feeding the mixture into a belt alcoholysis machine, carrying out alcoholysis reaction for 45 minutes at the reaction temperature of 45 +/-2 ℃, generating blocky polyvinyl alcohol, and separating out a mother solution.
Blocky polyvinyl alcohol enters a screw extruder for liquid removal after being crushed, the rotating speed of the extruder is changed by adjusting the power supply frequency of a motor of the extruder to control the liquid removal effect, and meanwhile, clear liquid (condensate after steam condensation generated when materials after liquid removal are dried through a dryer) is added into the screw extruder at the adding amount of 1000L/h, so that the filter screen is cleaned to prevent blockage.
Drying and heat treating the deliquored polyvinyl alcohol to obtain a polyvinyl alcohol PVA17-88 product.
The normal production cycle for producing the product is 40 days, and as the lower the alcoholysis degree of the PVA product is, the higher the incomplete degree of the reaction is, the more the waste liquid is separated out in the drying process of the dryer, the severe skinning of the dryer is caused, the greater the drying difficulty is, the poorer the effect is, and the shorter the production cycle is, so that the production cycle of the 17-88 variety is relatively shortened compared with that of the 17-92 variety. However, the improvement of the embodiment greatly improves the production period of the PVA17-88 product compared with the prior art.
The quality indexes of the produced products are comprehensively analyzed and displayed: the main quality indexes are not influenced, and the using effect of a client is not influenced.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method for prolonging the production cycle of polyvinyl alcohol with low alcoholysis degree, which is obtained by carrying out alcoholysis, crushing, liquid removal and drying on a methanol solution of polyvinyl acetate, is characterized in that: the production period of the polyvinyl alcohol with low alcoholysis degree is prolonged by improving an alcoholysis unit and/or a liquid removal unit.
2. The method of claim 1, wherein the production cycle time of the polyvinyl alcohol with low alcoholysis degree is prolonged by: the improved method for the alcoholysis unit comprises: the quality concentration of the methanol solution of the polyvinyl acetate is improved, and alcoholysis technological parameters are controlled to improve the completeness of alcoholysis reaction, so that the production cycle of the polyvinyl alcohol with low alcoholysis degree is prolonged.
3. The method of claim 1, wherein the production cycle time of the polyvinyl alcohol with low alcoholysis degree is prolonged by: the improved method of the liquid removal unit comprises the following steps: and (3) removing liquid from the crushed material through a screw extruder, and adding clear liquid to play a role in cleaning a filter screen to prevent blockage, so that the production period of the polyvinyl alcohol with low alcoholysis degree is prolonged.
4. The method of claim 2, wherein the production cycle time of the polyvinyl alcohol with low alcoholysis degree is prolonged by: after the alcoholysis unit is improved: the mass concentration of the methanol solution of the polyvinyl acetate is not lower than 35 percent; the sodium hydroxide solution used for alcoholysis is formed by mixing a methanol solution of sodium hydroxide and water, wherein the concentration of the sodium hydroxide is 60-90 g/L, and the mass concentration of the water is 30-40%; and during alcoholysis, the molar ratio of the sodium hydroxide to the polyvinyl acetate is 0.011-0.014.
5. A method of extending the production cycle of a low alcoholysis degree polyvinyl alcohol according to claim 3 wherein: the adding amount of the clear liquid is 900-1000L/h.
6. A method for extending the production cycle of polyvinyl alcohol with a low degree of alcoholysis according to claim 3 or claim 5, wherein: the clear liquid is condensed liquid after the steam generated by the drying unit is condensed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010715980.9A CN111763275B (en) | 2020-07-23 | 2020-07-23 | Method for prolonging production period of polyvinyl alcohol with low alcoholysis degree |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010715980.9A CN111763275B (en) | 2020-07-23 | 2020-07-23 | Method for prolonging production period of polyvinyl alcohol with low alcoholysis degree |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111763275A true CN111763275A (en) | 2020-10-13 |
| CN111763275B CN111763275B (en) | 2023-03-28 |
Family
ID=72727542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010715980.9A Active CN111763275B (en) | 2020-07-23 | 2020-07-23 | Method for prolonging production period of polyvinyl alcohol with low alcoholysis degree |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111763275B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114426692A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Method for forming polyvinyl alcohol solid with ultralow alcoholysis degree |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4338405A (en) * | 1980-12-12 | 1982-07-06 | E. I. Du Pont De Nemours And Company | Process for continuous controlled alcoholysis of polyvinyl acetate |
| CN1330090A (en) * | 2001-08-01 | 2002-01-09 | 青岛化工学院 | Process for preparing polyvinyl alcohol with low alcoholysis level |
| CN101575391A (en) * | 2009-06-11 | 2009-11-11 | 安徽皖维高新材料股份有限公司 | Polyvinyl alcohol with low degree of polymerization and alcoholysis method thereof |
| CN104558319A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工集团公司 | Method for improving forming of low-viscosity polyvinyl alcohol |
| CN107474163A (en) * | 2017-08-24 | 2017-12-15 | 安徽皖维高新材料股份有限公司 | A kind of alcoholysis method of polyvinyl alcohol with low alcoholysis level |
-
2020
- 2020-07-23 CN CN202010715980.9A patent/CN111763275B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4338405A (en) * | 1980-12-12 | 1982-07-06 | E. I. Du Pont De Nemours And Company | Process for continuous controlled alcoholysis of polyvinyl acetate |
| CN1330090A (en) * | 2001-08-01 | 2002-01-09 | 青岛化工学院 | Process for preparing polyvinyl alcohol with low alcoholysis level |
| CN101575391A (en) * | 2009-06-11 | 2009-11-11 | 安徽皖维高新材料股份有限公司 | Polyvinyl alcohol with low degree of polymerization and alcoholysis method thereof |
| CN104558319A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工集团公司 | Method for improving forming of low-viscosity polyvinyl alcohol |
| CN107474163A (en) * | 2017-08-24 | 2017-12-15 | 安徽皖维高新材料股份有限公司 | A kind of alcoholysis method of polyvinyl alcohol with low alcoholysis level |
Non-Patent Citations (1)
| Title |
|---|
| 王小明: "醇解度PVA的压榨设备选用探讨", 《化工管理》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114426692A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Method for forming polyvinyl alcohol solid with ultralow alcoholysis degree |
| CN114426692B (en) * | 2020-10-15 | 2024-02-09 | 中国石油化工股份有限公司 | Forming method of polyvinyl alcohol solid with ultralow alcoholysis degree |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111763275B (en) | 2023-03-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2021004069A1 (en) | Method for recycling waste polyester material | |
| US11655351B2 (en) | Method for recycling waste polyester with continuous alcoholysis and transesterification | |
| US10676576B2 (en) | Process for preparing cellulose solution and equipment therefor | |
| CN102219667B (en) | Higher fatty acid metal salt and preparation method thereof | |
| CN104558319A (en) | Method for improving forming of low-viscosity polyvinyl alcohol | |
| CN103554314A (en) | Production method of high-purity polyvinyl alcohol | |
| CN107522631B (en) | Preparation method of oxytetracycline hydrochloride | |
| CN111763275B (en) | Method for prolonging production period of polyvinyl alcohol with low alcoholysis degree | |
| CN101676322A (en) | Regeneration process of waste rubber | |
| CN102863567A (en) | Preparation method of polyvinyl alcohol through low-alkali method | |
| CN101575391A (en) | Polyvinyl alcohol with low degree of polymerization and alcoholysis method thereof | |
| CN102746498B (en) | Method for increasing melt viscosities of recycled polyester bottle flakes | |
| CN105820601B (en) | A kind of preparation of top grade Nano calcium carbonate dedicated to printing ink | |
| DE102020121552A1 (en) | PROCESS FOR MANUFACTURING BIO-BASED COMPOSITE MATERIALS USING PALM BIOMASS POWDER AS RAW MATERIAL | |
| CN107474163A (en) | A kind of alcoholysis method of polyvinyl alcohol with low alcoholysis level | |
| CN110438583B (en) | Polyester fiber and preparation method thereof | |
| CN110126136B (en) | Tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes | |
| CN103215837A (en) | Method for preparing unbleached pulp and producing high-strength corrugated paper from cotton stalk | |
| CN113430022A (en) | Method for preparing sodium polystyrene sulfonate by sulfonating waste polystyrene and application of sodium polystyrene sulfonate in coal water slurry | |
| CN112060395A (en) | Plastic particle production process | |
| CN108517019B (en) | Preparation method of konjac glucomannan phosphate | |
| CN111205531A (en) | Preparation method of rubber deodorant | |
| CN112239222A (en) | Equipment and method for continuous hydrothermal production of magnesium hydroxide | |
| CN204918433U (en) | Tricapryl trimellitate apparatus for producing | |
| CN112341553B (en) | Preparation method of low ash content fiber-grade polyvinyl alcohol |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A method for prolonging the production cycle of low alcohol solubility polyvinyl alcohol Effective date of registration: 20231120 Granted publication date: 20230328 Pledgee: Industrial and Commercial Bank of China Limited Chaohu sub branch Pledgor: ANHUI WANWEI UPDATED HIGH-TECH MATERIAL INDUSTRY Co.,Ltd. Registration number: Y2023980066338 |