CN101525290A - Preparation method of diethyl malonate - Google Patents
Preparation method of diethyl malonate Download PDFInfo
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- CN101525290A CN101525290A CN200910116649A CN200910116649A CN101525290A CN 101525290 A CN101525290 A CN 101525290A CN 200910116649 A CN200910116649 A CN 200910116649A CN 200910116649 A CN200910116649 A CN 200910116649A CN 101525290 A CN101525290 A CN 101525290A
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- China
- Prior art keywords
- reaction
- solution
- acid
- sodium
- diethyl malonate
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Links
- LTMRRSWNXVJMBA-UHFFFAOYSA-L 2,2-diethylpropanedioate Chemical compound CCC(CC)(C([O-])=O)C([O-])=O LTMRRSWNXVJMBA-UHFFFAOYSA-L 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 49
- MLIREBYILWEBDM-UHFFFAOYSA-N cyanoacetic acid Chemical compound OC(=O)CC#N MLIREBYILWEBDM-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 16
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 14
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 14
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 claims abstract description 9
- BCTWNMTZAXVEJL-UHFFFAOYSA-N phosphane;tungsten;tetracontahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.P.[W].[W].[W].[W].[W].[W].[W].[W].[W].[W].[W].[W] BCTWNMTZAXVEJL-UHFFFAOYSA-N 0.000 claims abstract description 8
- FDRCDNZGSXJAFP-UHFFFAOYSA-M sodium chloroacetate Chemical compound [Na+].[O-]C(=O)CCl FDRCDNZGSXJAFP-UHFFFAOYSA-M 0.000 claims abstract description 7
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000005886 esterification reaction Methods 0.000 claims description 16
- 230000032050 esterification Effects 0.000 claims description 14
- NLBFDFIZQKPFKP-UHFFFAOYSA-N [Na].C(#N)CC(=O)O Chemical compound [Na].C(#N)CC(=O)O NLBFDFIZQKPFKP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 230000020477 pH reduction Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 26
- 238000003756 stirring Methods 0.000 abstract description 10
- 150000002148 esters Chemical class 0.000 abstract description 5
- 239000007864 aqueous solution Substances 0.000 abstract description 3
- 230000007935 neutral effect Effects 0.000 abstract description 2
- 239000011949 solid catalyst Substances 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 abstract 2
- 238000002156 mixing Methods 0.000 abstract 2
- JAUCIKCNYHCSIR-UHFFFAOYSA-M sodium;2-cyanoacetate Chemical compound [Na+].[O-]C(=O)CC#N JAUCIKCNYHCSIR-UHFFFAOYSA-M 0.000 abstract 2
- 229940106681 chloroacetic acid Drugs 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000007333 cyanation reaction Methods 0.000 abstract 1
- 238000010992 reflux Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000011973 solid acid Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 235000017550 sodium carbonate Nutrition 0.000 description 5
- 238000007171 acid catalysis Methods 0.000 description 4
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 4
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- MNWBNISUBARLIT-UHFFFAOYSA-N sodium cyanide Chemical compound [Na+].N#[C-] MNWBNISUBARLIT-UHFFFAOYSA-N 0.000 description 4
- 238000000967 suction filtration Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000013019 agitation Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000012043 crude product Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000012047 saturated solution Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a preparation method of diethyl malonate. The preparation method comprises the following steps: allowing a neutralization reaction between chloroacetic acid and soda solution, mixing an obtained product sodium monochloroacetate solution with sodium cyanide aqueous solution to allow a cyanation reaction while stirring to generate sodium cyanoacetate solution, mixing the sodium cyanoacetate solution with hydrochloride solution to allow an acidizing reaction while stirring to generate cyanoacetic acid solution, dehydrating the obtained cyanoacetic acid solution in a reaction kettle in vacuum, relieving vacuum, sequentially adding ethanol and a solid catalyst 12-tungstophosphoric acid, introducing HCl gas, stirring, keeping temperature and allowing a reflux reaction, cooling to 50 DEG C, continuously putting feed liquid in a filtration tank for filtration to obtain raw ester, then regulating pH of the raw ester value to be neutral, and turning to a rectification process to obtain the diethyl malonate finished product. Compared with the traditional process, the preparation method has lower cost and environment-friendly process and ensures balanced reaction and easy operation.
Description
Technical field
The present invention relates to a kind of preparation method of organic acid acetic, specifically is a kind of preparation method of diethyl malonate.
Background technology
The production of diethyl malonate all is to adopt a kind of traditional production technique before this at home, promptly utilizes the cyanoacetic acid and the ethanol synthetic under 98% sulphuric acid catalysis effect that generate in the technological process.The raw material of main processes and use comprises:
1, neutralization reaction process: raw material is Mono Chloro Acetic Acid (the molecular formula ClCH of 320Kg97%
2COOH), the yellow soda ash (Na of 180Kg99%
2CO
3).The yellow soda ash of 180Kg99% is become saturated solution about 34% with the hot water dissolving, be used for then load weighted 320Kg97% in the dropwise reaction still Mono Chloro Acetic Acid, stir to make the acid-base neutralisation reaction take place, control terminal point pH value equals 7.0.Obtain the reaction product sodium chloroacetate solution.Reaction equation:
2ClCH
2COOH+Na
2CO
3→2ClCH
2COONa+H
2O+CO
2
2, cyanogenation process: with the product sodium chloroacetate solution that obtains previously is raw material, and natural reaction generates cyanoacetic acid sodium (CNCH with stirring down after sodium cyanide (NaCN) aqueous solution of the 550KG30% that measures
2COONa) solution.Reaction equation:
ClCH
2COONa+NaCN→CNCH
2COONa+NaCl
3, acidification reaction process: with the cyanoacetic acid sodium solution that obtains previously, after the hydrochloric acid soln of the 420Kg31% that measures mixes, under agitation carry out natural reaction, obtain cyanoacetic acid solution.Reaction equation:
CNCH
2COONa+HCl→CNCH
2COOH+NaCl
4, vacuum hydro-extraction and esterification reaction process: the cyanoacetic acid solution that will obtain in reactor is under vacuum state, utilize the heating of still jacket steam, do not stop to stir the moisture that makes in the solution and be evaporated gradually and separate, the moisture content in the control material is in 5%.Under whipped state, add the spirituous solution of the 400KG95% measure and the vitriol oil of 580Kg98% after the venting vacuum successively, and add vitriolic speed by control and control the temperature of reaction that adds sulfuric acid process and be not more than 75 ℃.Add and be incubated esterification time about 5 hours behind the sulfuric acid, the highest control of temperature is reduced to normal temperature then less than 100 ℃, has promptly obtained diethyl malonate (molecular formula CH
2(COOC
2H
5)
2) crude mixture.The main reaction equation:
CNCH
2COOH+2CH
3CH
2OH+H
2SO
4→CH
2(COOC
2H
5)
2+NH
4HSO
4
5, water washing process: promptly with the water of 1400Kg with after esterification reaction product mixes, standing demix, refuses such as a large amount of salt that the water miscible esterification process of removal lower floor is remaining and acid obtain the crude product of upper strata diethyl malonate.
6, rectification and purification: utilize distillation operation to make the diethyl malonate crude product be converted into final highly purified diethyl malonate product.
Traditional the most outstanding shortcoming of production technique is exactly to have used sulfuric acid to make catalyzer and produced a large amount of acid waste water in esterification process, has caused environmental pollution or has brought bigger environmental protection pressure, has increased processing cost.And in esterification process, produced a large amount of waste gas hydrogenchloride, corroded equipment.Vigorously advocate under the policy guide of cleaner production in country at present, vast production commercial city produces diethyl malonate in the technology of actively seeking a kind of comparison environmental protection.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of diethyl malonate, adopt the 12-tungstophosphoric acid as esterifying catalyst, reaction process is safer, need not add a large amount of water after reaction finishes and wash material, reduced the consumption of ethanol and diethyl malonate, conversion rate of esterification has increased, and the growing amount of diethyl malonate has improved, simultaneously because solid acid also greatly reduces the cost of catalyzer through recycling.
Technical scheme of the present invention is as follows:
The preparation method of diethyl malonate, include neutralization, cyaniding, acidifying, vacuum hydro-extraction and esterification, washing, steps such as rectification and purification, described neutralization is to use Mono Chloro Acetic Acid and saturated aqueous sodium carbonate reaction to generate sodium chloroacetate, described cyaniding is that liquid is finished in the utilization neutralization and sodium cyanide carries out cyanogenation generation cyanoacetic acid sodium solution, described acidifying is to utilize cyanoacetic acid sodium and hydrochloric acid reaction to generate cyanoacetic acid, described vacuum hydro-extraction and esterification are that the cyanoacetic acid solution that will obtain is under vacuum state, heating makes that moisture evaporation is separated in the solution, control cyanoacetic acid moisture content is below 5%, utilize the cyanoacetic acid and the ethanol that generate under the katalysis of catalyzer, to generate diethyl malonate, the catalyzer that it is characterized in that the employing in the described esterif iotacation step is the 12-tungstophosphoric acid, the weight of 12-tungstophosphoric acid is the 4-6% of chloroacetic weight, and temperature of reaction is controlled between 60-110 ℃.
The preparation method of described diethyl malonate is characterized in that: in the described neutralization procedure, the pH value of control reaction end is between 7.0-7.2; In the cyaniding step, control reaction top temperature is between 100-110 ℃; In the acidification step, control reaction temperature is below 50 ℃; In the esterif iotacation step, control reaction temperature is between 80-110 ℃.
Catalyzer 12-tungstophosphoric acid, molecular structural formula H
3PO
412WO
3XH
2O, molecular formula H
3[P (W
3O
10)
4] XH
2O, molecular weight 2880.05 (anhydrous).
Compared with prior art, the present invention has following characteristics:
When (1) esterification is operated, traditional technology causes temperature of reaction easily sharply to raise owing to adding a large amount of vitriol oils, causes material to be taken out of reactor by gas easily, danger such as personnel's injury and equipment explosion occur, and novel process reacting balance, thereby existence that just should danger;
(2) reduction of production cost, be owing to adopted solid acid catalysis in the novel process, need not add a large amount of water behind the reaction result and wash material, reduced the consumption of ethanol and diethyl malonate, simultaneously because solid acid also greatly reduces the cost of catalyzer through recycling, be that conversion rate of esterification has increased, the growing amount of diethyl malonate has improved.
Traditional technology and solid acid catalysis method novel process effect comparison chart:
| Project name | Traditional technology | Novel process |
| Catalyst levels/batch | 580KG98% sulfuric acid | Solid acid 15KG |
| The ethanol consumption/batch | 400KG | 360KG |
| The acid waste water amount that produces/batch | 3000KG | 0KG |
| The hydrogen chloride gas scale of construction that discharges/batch | About 18KG | 0KG |
| The esterification process operating effect | The too fast material that dashes of reaction appears easily | Molecular balance is easy to operate |
| Diethyl malonate growing amount after esterification is finished | 460KG | 480KG |
| Production cost | The cost height | Cost reduces |
Embodiment
(1) equipment is prepared: the enamel stirred autoclave of a 2000L (attached access water coolant, water vapor, blowdown condenser), 1 of the poidometer measuring tank of 800L (as depositing liquid sodium cyanide), 3 of the poidometer measuring tanks of 500L (being used for depositing saturated sodium carbonate solution, hydrochloric acid soln and ethanol respectively); One of 500L vacuumfilter, one in vacuum pump; One of the thick ester receiving tank of 800L; Other off-set facility is some.
(2) technical process: neutralization-cyaniding-thick ester-rectifying of acidifying-dehydration-esterification-filtration-De gets finished product.
(3) operation steps:
1, neutralization reaction process: raw material is Mono Chloro Acetic Acid (the molecular formula ClCH of 320Kg97%
2COOH), the yellow soda ash (Na of 180Kg99%
2CO
3).The yellow soda ash of 180Kg99% is become saturated solution about 34% with the hot water dissolving, be used for then load weighted 320Kg97% in the dropwise reaction still Mono Chloro Acetic Acid, stir to make the acid-base neutralisation reaction take place, control terminal point pH value equals 7.0.Obtain the reaction product sodium chloroacetate solution; Reaction equation:
2ClCH
2COOH+Na
2CO
3→2ClCH
2COONa+H
2O+CO
2
2, cyanogenation process: with the product sodium chloroacetate solution that obtains previously is raw material, and natural reaction generates cyanoacetic acid sodium (CNCH with stirring down after sodium cyanide (NaCN) aqueous solution of the 550KG30% that measures
2COONa) solution; Reaction equation:
ClCH
2COONa+NaCN→CNCH
2COONa+NaCl
3, acidification reaction process: with the cyanoacetic acid sodium solution that obtains previously, after the hydrochloric acid soln of the 420Kg31% that measures mixes, under agitation carry out natural reaction, obtain cyanoacetic acid solution; Reaction equation:
CNCH
2COONa+HCl→CNCH
2COOH+NaCl
4, vacuum hydro-extraction and solid acid catalysis esterification: the cyanoacetic acid solution that will obtain in reactor is under vacuum state, utilize the heating of still jacket steam, do not stop to stir the moisture that makes in the solution and be evaporated gradually and separate, the moisture content in the control cyanoacetic acid material is in 5%; The ethanol that adds 360KG95% then adds the solid catalyst 12-tungstophosphoric acid of 15KG simultaneously, and feeds HCL gas, stirs the insulation back flow reaction, and temperature is controlled in 110 ℃ from low to high, and the reaction times is 6 hours; Reaction equation:
CNCH
2COOH+2CH
3CH
2OH→CH
2(COOC
2H
5)
2+NH
3
5, suction filtration process: be cooled to 50 ℃, feed liquid put into the suction filtration jar continuously carry out the suction filtration jar and carry out suction filtration, obtain thick ester;
6, regulate thick ester PH to neutral, change rectifying over to and obtain the diethyl malonate finished product.
In the described neutralization procedure, the pH value of control reaction end is between 7.0-7.2; In the cyaniding step, control reaction top temperature is between 100-110 ℃; In the acidification step, control reaction temperature is below 50 ℃; In the esterif iotacation step, control reaction temperature is between 80-110 ℃.
Claims (2)
1, the preparation method of diethyl malonate, include neutralization, cyaniding, acidifying, vacuum hydro-extraction and esterification, washing, steps such as rectification and purification, described neutralization is to use Mono Chloro Acetic Acid and saturated aqueous sodium carbonate reaction to generate sodium chloroacetate, described cyaniding is that liquid is finished in the utilization neutralization and sodium cyanide carries out cyanogenation generation cyanoacetic acid sodium solution, described acidifying is to utilize cyanoacetic acid sodium and hydrochloric acid reaction to generate cyanoacetic acid, described vacuum hydro-extraction and esterification are that the cyanoacetic acid solution that will obtain is under vacuum state, heating makes that moisture evaporation is separated in the solution, control cyanoacetic acid moisture content is below 5%, utilize the cyanoacetic acid and the ethanol that generate under the katalysis of catalyzer, to generate diethyl malonate, the catalyzer that it is characterized in that the employing in the described esterif iotacation step is the 12-tungstophosphoric acid, the weight of 12-tungstophosphoric acid is the 4-6% of chloroacetic weight, and temperature of reaction is controlled between 60-110 ℃.
2, the preparation method of diethyl malonate according to claim 1 is characterized in that: in the described neutralization procedure, the pH value of control reaction end is between 7.0-7.2; In the cyaniding step, control reaction top temperature is between 100-110 ℃; In the acidification step, control reaction temperature is below 50 ℃; In the esterif iotacation step, control reaction temperature is between 80-110 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101166499A CN101525290B (en) | 2009-04-28 | 2009-04-28 | Preparation method of diethyl malonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101166499A CN101525290B (en) | 2009-04-28 | 2009-04-28 | Preparation method of diethyl malonate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101525290A true CN101525290A (en) | 2009-09-09 |
| CN101525290B CN101525290B (en) | 2012-06-13 |
Family
ID=41093389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101166499A Active CN101525290B (en) | 2009-04-28 | 2009-04-28 | Preparation method of diethyl malonate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101525290B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103936588A (en) * | 2014-03-31 | 2014-07-23 | 河北诚信有限责任公司 | Green and clean process for preparing malonate |
| CN106478384A (en) * | 2016-08-31 | 2017-03-08 | 河北诚信有限责任公司 | A kind of method that malonate produces the advanced treating coproduction ethers of tail gas |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1556995A (en) * | 1994-01-06 | 1995-08-01 | Thiokol Corporation | Process for making 5-nitrobarbituric acid and salts thereof |
| CN100516016C (en) * | 2006-04-29 | 2009-07-22 | 重庆紫光化工股份有限公司 | The preparation method of malonate |
-
2009
- 2009-04-28 CN CN2009101166499A patent/CN101525290B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103936588A (en) * | 2014-03-31 | 2014-07-23 | 河北诚信有限责任公司 | Green and clean process for preparing malonate |
| CN106478384A (en) * | 2016-08-31 | 2017-03-08 | 河北诚信有限责任公司 | A kind of method that malonate produces the advanced treating coproduction ethers of tail gas |
| CN106478384B (en) * | 2016-08-31 | 2019-03-12 | 河北诚信集团有限公司 | A kind of method of the advanced treating coproduction ethers of malonate production tail gas |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101525290B (en) | 2012-06-13 |
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Denomination of invention: Preparation method of diethyl malonate Effective date of registration: 20230529 Granted publication date: 20120613 Pledgee: Lai An county Jinan financing Company limited by guarantee Pledgor: ANHUI JINBANG PHARMACEUTICAL CHEMICAL CO.,LTD. Registration number: Y2023980042003 |
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Granted publication date: 20120613 Pledgee: Lai An county Jinan financing Company limited by guarantee Pledgor: ANHUI JINBANG PHARMACEUTICAL CHEMICAL CO.,LTD. Registration number: Y2023980042003 |