CN103253634A - Process for producing ultra-clean high-purity hydrochloric acid - Google Patents
Process for producing ultra-clean high-purity hydrochloric acid Download PDFInfo
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- CN103253634A CN103253634A CN2013102022744A CN201310202274A CN103253634A CN 103253634 A CN103253634 A CN 103253634A CN 2013102022744 A CN2013102022744 A CN 2013102022744A CN 201310202274 A CN201310202274 A CN 201310202274A CN 103253634 A CN103253634 A CN 103253634A
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Abstract
The invention discloses a process for producing ultra-clean high-purity hydrochloric acid. The process comprises the following steps of: selecting a material: selecting a hydrochloric acid solution with the concentration of 36-38% as a raw material; diluting: diluting the raw material to 35% by using deionized water; rectifying: adding the raw material after dilution into an internal heating type rectifying device, introducing cooling water into a hydrochloric acid absorber, and simultaneously starting an internal heating device to start to heat the raw material; absorbing: enabling gas-state hydrochloric acid and water vapor to re-form the hydrochloric acid solution in the hydrochloric acid absorber after the gas-state hydrochloric acid and the water vapor are generated from the raw material by heating and evaporation, then continuously adding the raw material into the rectifying device, and simultaneously opening a deslagging valve; matching: further pumping the hydrochloric acid solution into a mixing tank, performing matching treatment in the mixing tank and controlling at about 37%; and filtering and subpackaging: filtering the hydrochloric acid solution after matching through a filter to form a finished product hydrochloric acid solution, and then subpackaging. The process is the preparation method of the ultra-clean high-purity hydrochloric acid, which has the advantages of strong continuity, high purification degree and low content of impurities.
Description
Technical field
The present invention relates to a kind of production technique of producing high-purity hydrochloric acid.High purity hydrochloric acid mainly is applicable to the usefulness of conduct cleaning in the microelectronics industry manufacturing large-scale integrated circuit semiconducter device industry.Belong to microelectronics chemistry reagent technical field.
Background technology
Along with developing rapidly of semiconductor technology, more and more higher to the requirement of ultra-clean and high pure chemical reagent.In the course of processing of unicircuit (IC), ultra-clean and high pure chemical reagent is mainly used in cleaning and the etching on chip and silicon wafer surface, and its purity and cleanliness factor have very great influence to yield rate, electrical property and the reliability of unicircuit.High-purity hydrochloric acid has been widely used in aspects such as cleaning in semi-conductor, the large-scale integrated circuit course of processing, drying as a kind of important microelectronics chemistry product.Oneself enters submicron, deep-submicron epoch along with the finish size of IC, supporting with it high-purity hydrochloric acid is had higher requirement, require particle and foreign matter content to reduce by 1 ~ 3 order of magnitude, reach the SEMI C12 standard that semiconductor equipment and material structure are formulated, wherein metallic cation content is less than 0.1 ppb, and granular size is controlled below 0.5 μ m.
At present, normally to be that feed purification is refining with the technical-grade hydrochloric acid form high-purity hydrochloric acid.Rectifying is the main method of industrialization purification hydrochloric acid, comprises azeotropic distillation, extracting rectifying etc.But be used for the industrial high-purity hydrochloric acid of microelectronics chemistry product to metallic impurity wherein, the requirement of granular size content and negatively charged ion is very harsh, and existing rectification process can't meet the demands.
Chinese patent CN1488750A discloses a kind of preparation method of ultrapure hydrochloric acid, be raw material with the technical hydrochloric acid, regulate the pH value with carbonate, add dewatering agent, carry out back flow reaction, through rectifying, distillation, membrane filtration, obtain meeting the ultrapure hydrochloric acid of the SEMI C12 standard that semiconductor equipment and material structure formulate.The preparation method of this open report can't stablize the control quality product, particularly metal ion neutralization product content and granule foreign size.
Summary of the invention
Purpose of the present invention is overcoming the high purity hydrochloric acid unstable product quality that prior art is produced, can not satisfy the deficiency of super large-scale integration processing request, provide that a kind of technology continuity is strong, the preparation method of good separating effect, purity height, high-purity hydrochloric acid that foreign matter content is low.
For achieving the above object, technical scheme of the present invention has provided a kind of technology for the production of high-purity hydrochloric acid, it is characterized in that, described technology comprises following processing step:
The first step is selected materials, and selecting concentration for use is that 36 ~ 38% purified grade hydrochloric acid soln is raw material;
The dilution of second step is with the concentration dilution to 35% of deionized water with described raw material;
The 3rd step rectifying, raw material after the dilution is added in the rectifying device of internal heat type, the equipment of wherein said rectifying is connected with the salt absorber acid by pipeline, with raw material add to set liquid level ± 10mm after, feed water coolant in the spiral pipe in the described salt absorber acid, thermic devices begins raw material is heated in starting simultaneously;
The 4th step absorbed, after raw material is heated evaporation generation gaseous hydrochloric acid and water vapour, described gaseous hydrochloric acid and water vapour form hydrochloric acid soln again by pipeline in the salt absorber acid, continue this moment to add described raw material in rectifying device again, open residual cake valve simultaneously;
The 5th step is assorted, the hydrochloric acid soln in the salt absorber acid is extracted in the mixing tank again, carries out assorted processing in mixing tank, controls about 37% by assorted concentration with hydrochloric acid soln;
The 6th step was filtered packing, and the hydrochloric acid soln after assorted is filtered into the finished product salt acid solution by strainer, carried out packing then.
Optimized technical scheme is that described rectification process will pass through one-level rectifying at least.
Further optimized technical scheme is, described rectifying device is the quartzy rectifying device of internal electrical heating-type.
Optimized technical scheme also has, and is provided with densometer or density sensor in institute's salt absorber acid, according to the set(ting)value 1.18g/ml of density, joins flow in the rectifying device by manually or automatically controlling raw material.
Optimized technical scheme also has, and is provided with the tetrafluoro polyethylene liner in described mixing tank.
Optimized technical scheme also has, and described strainer is a container, is equipped with the expanded microporous polytetra fluoroethylene-EPTEE film in described container, and the aperture of described micropore is 0.1-0.2 μ m; Described container is connected with source nitrogen by pipeline, hydrochloric acid soln in the process of filtering with container in nitrogen gas pressure control less than 0.1Mpa.
Optimized technical scheme also has, and described container must be cleaned with secondary deionized water before use in advance, drains ponding, cleans the moisture on surface again with dehydrated alcohol, dries up with nitrogen, scrubs three to four times with hydrochloric acid soln to be filtered again.
Optimized technical scheme also has, described packing is that the hydrochloric acid soln after filtering is packed in the finished product bottle, branch loading amount in the finished product bottle is strict controlled in the volume of adorning ± 2%, after hydrochloric acid soln in the finished product bottle is installed by branch, the lid of pad in installing is covered and tightens, use the outer wall of deionized water washing bottle mouth container again.
Optimized technical scheme also has, and described finished product bottle need carry out clean before use, and the technological process of described cleaning comprises: slightly wash and the acid bubble, the finished product bottle after slightly washing is put into adds 15 ~ 20% hydrochloric acid in the sour reservoir and soaked at least 12 hours; Machinery cleans, and will with tap water flush away acid solution, scrub inside and outside mechanical hairbrush, to remove the visible mechanical impurity of naked eyes through the finished product bottle of peracid bubble again; Deionization cleans, and the finished product bottle after machinery is cleaned again with washed with de-ionized water once; Ultrapure water is super to be washed, and puts into ultrasonic tank after will cleaning once with ultrapure water through the finished product bottle of washed with de-ionized water, piles ultrapure water, regulates that ultrasonic wave is super after the ultrasonic wave washed 5 ~ 10 minutes, simultaneously with required bottle cap, pad super washing together.
Optimized technical scheme also has, and ultrapure water is surpassed to be inverted after the finished product bottle of washing cleans 3 times with terminal water again do surplus water, puts into Turnover Box, then Turnover Box is put into baking oven and is dried by the fire at least 12 hours, is used for packing finished product hydrochloric acid soln then through after the assay was approved.
Advantage of the present invention and beneficial effect are: compared with prior art, because rectifying, filtration process that the present invention adopts are a kind of new hydrochloric acid soln purifying techniques, have easy processing, cheap, toxicity is little, the advantage of being convenient to reclaim.Can reduce the content of metal ion neutralization product greatly.Can systematically, effectively remove by micropore filtering film and to comprise organic macromolecule in the product, bacterium, virus, anionic impurity.The present invention has overcome shortcomings such as the separating impurity difficulty, unstable product quality of other preparation hydrochloric acid technology, the organic carbon in the technical-grade hydrochloric acid, zwitterion and granule foreign have effectively been removed, the product hydrochloric acid main content that makes is greater than 99.99%, single cations is lower than 0.lppb, single anion-content is lower than 50ppb, the dust granules of (〉=0.2 μ m, 〉=0.5 μ m) is lower than 10/ml, and quality meets semiconductor equipment and material structure SEMI-C12 standard.It is little that used process unit also has floor space, easily automated operation, characteristics such as steady quality and continuous production.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
The present invention is a kind of technology for the production of high-purity hydrochloric acid, it is characterized in that, described technology comprises following processing step:
The first step is selected materials, and selecting concentration for use is that 36 ~ 38% purified grade hydrochloric acid soln is raw material;
The dilution of second step is with the concentration dilution to 35% of deionized water with described raw material;
The 3rd step rectifying, raw material after the dilution is added in the rectifying device of internal heat type, the equipment of wherein said rectifying is connected with the salt absorber acid by pipeline, with raw material add to set liquid level ± 10mm after, feed water coolant in the spiral pipe in the described salt absorber acid, thermic devices begins raw material is heated in starting simultaneously;
The 4th step absorbed, after raw material is heated evaporation generation gaseous hydrochloric acid and water vapour, described gaseous hydrochloric acid and water vapour form hydrochloric acid soln again by pipeline in the salt absorber acid, continue this moment to add described raw material in rectifying device again, open residual cake valve simultaneously;
The 5th step is assorted, the hydrochloric acid soln in the salt absorber acid is extracted in the mixing tank again, carries out assorted processing in mixing tank, controls about 37% by assorted concentration with hydrochloric acid soln;
The 6th step was filtered packing, and the hydrochloric acid soln after assorted is filtered into the finished product salt acid solution by strainer, carried out packing then.
In the present invention, described rectification process can pass through one-level rectifying.
In the present invention, described rectifying device is the quartzy rectifying device of internal electrical heating-type.
In the present invention, in institute's salt absorber acid, be provided with densometer or density sensor, according to the set(ting)value 1.18g/ml of density, join flow in the rectifying device by manually or automatically controlling raw material.
In the present invention, in described mixing tank, be equipped with the tetrafluoro polyethylene liner.
In the present invention, described strainer is a container, is equipped with the expanded microporous polytetra fluoroethylene-EPTEE film in described container, and the aperture of described micropore is 0.1-0.2 μ m; Described container is connected with source nitrogen by pipeline, hydrochloric acid soln in the process of filtering with container in nitrogen gas pressure control less than 0.1Mpa.
In the present invention, described container must be cleaned with secondary deionized water before use in advance, drains ponding, cleans the moisture on surface again with dehydrated alcohol, dries up with nitrogen, scrubs three to four times with hydrochloric acid soln to be filtered again.
In the present invention, described packing is that the hydrochloric acid soln after filtering is packed in the finished product bottle, branch loading amount in the finished product bottle is strict controlled in the volume of adorning ± 2%, after hydrochloric acid soln in the finished product bottle is installed by branch, the lid of pad in installing is covered and tightens, use the outer wall of deionized water washing bottle mouth container again.
In the present invention, described finished product bottle need carry out clean before use, and the technological process of described cleaning comprises: slightly wash and acid bubble, the finished product bottle after slightly washing is put into adds 15 ~ 20% hydrochloric acid in the sour reservoir and soaked at least 12 hours; Machinery cleans, and will with tap water flush away acid solution, scrub inside and outside mechanical hairbrush, to remove the visible mechanical impurity of naked eyes through the finished product bottle of peracid bubble again; Deionization cleans, and the finished product bottle after machinery is cleaned again with washed with de-ionized water once; Ultrapure water is super to be washed, and puts into ultrasonic tank after will cleaning once with ultrapure water through the finished product bottle of washed with de-ionized water, piles ultrapure water, regulates that ultrasonic wave is super after the ultrasonic wave washed 5 ~ 10 minutes, simultaneously with required bottle cap, pad super washing together.
In the present invention, be inverted after the super finished product bottle of washing of ultrapure water cleaned 3 times with terminal water again and do surplus water, put into Turnover Box, then Turnover Box is put into baking oven baking at least 12 hours, be used for packing finished product hydrochloric acid soln then through after the assay was approved.
This high-purity hydrochloric acid product property title: hydrochloric acid molecular formula: HCL molecular weight: 36.46 water white hydrochloride aqueous solutions, in air, be fuming, have pungency tart flavour; Energy and water immiscible phase, proportion about 1.18.
The agent of end-use acid attack.
Material name, specification, theoretical consumption, plan consume.
Material name, specification, hydrochloric acid 36%, purified grade.
Theoretical consumption, plan consume the production SILVER REAGENT: theory consumes 25%, plans to consume 28%.Produce high-purity level: theoretical consumption 30%, plan consumes 32%.
Thermoelectric (al) type distillation purification hydrochloric acid in the production technique of high-purity hydrochloric acid adopts, mainly be to remove solid particulate and the little foreign material of volatility, and high boiling point foreign material, interior thermoelectric (al) type distillation has higher separating effect, the king-post upper steam forms vapour, the water two-phase refluxes and shunts purification, high-purity water vapor and HCL main body are through the cooling of king-post condenser, and the HCL main body is absorbed the back by water and forms hydrochloric acid.
Major equipment and technical process.
Major equipment
Quartzy rectifying device one cover.
HCL absorbs container.
Finished product receives mixing tank (lining tetrafluoro).
Filtering system: met filter packing technological process
Packaging vessel cleaning system: see packaging vessel cleaning rules.
Technical process
Purified grade hydrochloric acid
Dilution
Rectifying
Piece together acid content
Middle control classification
Filter packing
Operation steps.
The content of dilution purified grade hydrochloric acid is 36-38%, needs before the rectifying it is diluted to 35% (adopting the autogamy of standard ratio method with densometer by producers).
Rectifying
In well heater, inject 35% hydrochloric acid through preparing, can lead to water coolant after making its liquid level remain on equipment liquid level ± 10mm, and begin energising and produce.
After treating normally to go out acid, its input speed is controlled in the beginning charging, should keep liquid level relatively stable, prevents that liquid level is low excessively, causes the underproduction or liquid level too high, and causing hydrogenchloride to escape influences the product yield.
Want per 2 hour records once in the rectifying, keep the acid amount to be stabilized in 2 ~ 3 liters/hour every group.
Receive the temperature of the water coolant of finished product control input speed and receiving bottle, the HCL gas in the receiving bottle can fully be absorbed, and the content of hydrochloric acid in the control receiving bottle, keep densometer to be not less than 1.18g/ml.And with in the finished product suction mixing tank that receives.
Deslagging is opened residual cake valve after rectifying is normal, the control lifting rate per hour is not more than 2 ~ 3 liters (6 groups)
When assorted content reaches 200 liters when the finished product in the mixing tank, fully mix, and assorted its content of sampling inspection, till qualified.
The packaging vessel of the cleaning reagent level product of packaging vessel cleans by the general reagent product vessel in " ultra-clean and high pure chemical reagent packaging vessel cleaning rules " and cleans.The packaging vessel of high-purity grade of product of ultra-clean cleans by the ultra-clean and high pure chemical reagent product vessel in " ultra-clean and high pure chemical reagent packaging vessel cleaning rules " and cleans.
Filter packing and filter packing SILVER REAGENT product by general reagent product (filtration) packing in " ultra-clean and high pure chemical reagent filters (packing) production technique working specification ".Filter high-purity grade of product of packing ultra-clean and filter packing by the ultra-clean and high pure chemical reagent product in " ultra-clean and high pure chemical reagent filters (packing) production technique working specification ".
Intermediate controlled project and method.
The intermediate controlled project;
Content, outward appearance, free chlorine, iron, sodium;
Method is pressed the regulation of GB622-1989.
Unusual phenomenon and handling suggestion appear in the nature of danger of raw material, intermediates, finished product and measure of control easily in the production.
The nature of danger of raw material, intermediates, finished product can not be store altogether with bases, oxygenant etc. and mix fortune.Hydrochloric acid has strong corrodibility, is sure not directly to contact with eyes, skin, in order to avoid burn.Note the sealing preservation, prevent the hydrogen chloride gas effusion.
Measure of control
Forbid to contact skin, worn face guard, gloves, acidproof table napkin, acidproof footwear.
Rectifying is strictly on guard against leakage, and keeps the ventilation of operating environment.
Unusual phenomenon and handling suggestion appear in the production easily.In process of production, prevent that hydrochloric acid from leaking and stop water coolant.As stop water coolant, stop immediately producing.Leak and in time to repair as hydrochloric acid, can resume production.
Safety notice
Face guard, gloves, coat-sleeve, skin skirt, acidproof footwear must have been dressed during operation
Operating process must keep good ventilated environment.
Keep the unimpeded of water coolant in the production process, forbid to cut off the water supply.
Entire equipment must not be collided, and knocks device systems in order to avoid cause artificial unnecessary damage.
Envrionment temperature must not be lower than 5
0C, equipment does not turn round during quenching must not have in the pipe-line equipment gas-liquid to store.Be strictly on guard against bursting by freezing.
Repair and the replacing equipment unit, must clean the pollutent of removing on the equipment pipe, make and repair the welded section cleaning, the obnoxious flavour in the remover apparatus tubing system can be opened and rush to repair the operation of returning to work, and to avoid the explosion hazard accident.
Situation, the handling suggestion of " three wastes " material." three wastes " material mainly is hydrochloric acid raffinate and hydrogen chloride gas, and raffinate is collected the back and done to expect quarter to sell, and should avoid escaping in the hydrogen chloride gas production process as far as possible.
PS Package Specification, sign.
PS Package Specification is pressed the regulation of GB/T-15346: wherein: internal packing form: NB-24.5 liter polyethylene drum or user's particular requirement; Outer packaging form: W-1, calcium plastic box; Packing unit: the 4th class.
The regulation that sign is pressed GB/T-15346 is indicated " corrosive corporation " storage temperature and is not more than 30
0C, 1 year quality guaranteed period.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the technology for the production of high-purity hydrochloric acid is characterized in that, described technology comprises following processing step:
The first step is selected materials, and selecting concentration for use is that 36 ~ 38% purified grade hydrochloric acid soln is raw material;
The dilution of second step is with the concentration dilution to 35% of deionized water with described raw material;
The 3rd step rectifying, raw material after the dilution is added in the rectifying device of internal heat type, the equipment of wherein said rectifying is connected with the salt absorber acid by pipeline, with raw material add to set liquid level ± 10mm after, feed water coolant in the spiral pipe in the described salt absorber acid, thermic devices begins raw material is heated in starting simultaneously;
The 4th step absorbed, after raw material is heated evaporation generation gaseous hydrochloric acid and water vapour, described gaseous hydrochloric acid and water vapour form hydrochloric acid soln again by pipeline in the salt absorber acid, continue this moment to add described raw material in rectifying device again, open residual cake valve simultaneously;
The 5th step is assorted, the hydrochloric acid soln in the salt absorber acid is extracted in the mixing tank again, carries out assorted processing in mixing tank, controls about 37% by assorted concentration with hydrochloric acid soln;
The 6th step was filtered packing, and the hydrochloric acid soln after assorted is filtered into the finished product salt acid solution by strainer, carried out packing then.
2. the technology for the production of high-purity hydrochloric acid as claimed in claim 1 is characterized in that, described rectification process will pass through one-level rectifying at least.
3. the technology for the production of high-purity hydrochloric acid as claimed in claim 1 is characterized in that, described rectifying device is the quartzy rectifying device of internal electrical heating-type.
4. the technology for the production of high-purity hydrochloric acid as claimed in claim 1, it is characterized in that, in institute's salt absorber acid, be provided with densometer or density sensor, according to the set(ting)value 1.18g/ml of density, join flow in the rectifying device by manually or automatically controlling raw material.
5. the technology for the production of high-purity hydrochloric acid as claimed in claim 1 is characterized in that, is provided with the tetrafluoro polyethylene liner in described mixing tank.
6. the technology for the production of high-purity hydrochloric acid as claimed in claim 1 is characterized in that, described strainer is a container, is equipped with the expanded microporous polytetra fluoroethylene-EPTEE film in described container, and the aperture of described micropore is 0.1-0.2 μ m; Described container is connected with source nitrogen by pipeline, hydrochloric acid soln in the process of filtering with container in nitrogen gas pressure control less than 0.1Mpa.
7. the technology for the production of high-purity hydrochloric acid as claimed in claim 6, it is characterized in that, described container must be cleaned with secondary deionized water before use in advance, drain ponding, clean the moisture on surface again with dehydrated alcohol, dry up with nitrogen, scrub three to four times with hydrochloric acid soln to be filtered again.
8. the technology for the production of high-purity hydrochloric acid as claimed in claim 1, it is characterized in that, described packing is that the hydrochloric acid soln after filtering is packed in the finished product bottle, branch loading amount in the finished product bottle is strict controlled in the volume of adorning ± 2%, after hydrochloric acid soln in the finished product bottle is installed by branch, the lid of pad in installing is covered and tightens, use the outer wall of deionized water washing bottle mouth container again.
9. the technology for the production of high-purity hydrochloric acid as claimed in claim 8, it is characterized in that, described finished product bottle need carry out clean before use, the technological process of described cleaning comprises: slightly wash and acid bubble, the finished product bottle after slightly washing is put into adds 15 ~ 20% hydrochloric acid in the sour reservoir and soaked at least 12 hours; Machinery cleans, and will with tap water flush away acid solution, scrub inside and outside mechanical hairbrush, to remove the visible mechanical impurity of naked eyes through the finished product bottle of peracid bubble again; Deionization cleans, and the finished product bottle after machinery is cleaned again with washed with de-ionized water once; Ultrapure water is super to be washed, and puts into ultrasonic tank after will cleaning once with ultrapure water through the finished product bottle of washed with de-ionized water, piles ultrapure water, regulates that ultrasonic wave is super after the ultrasonic wave washed 5 ~ 10 minutes, simultaneously with required bottle cap, pad super washing together.
10. the technology for the production of high-purity hydrochloric acid as claimed in claim 9, it is characterized in that, be inverted after the super finished product bottle of washing of ultrapure water cleaned 3 times with terminal water again and do surplus water, put into Turnover Box, then Turnover Box is put into baking oven baking at least 12 hours, be used for packing finished product hydrochloric acid soln then through after the assay was approved.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104812700A (en) * | 2013-11-28 | 2015-07-29 | 阿克马法国公司 | Hydrochloric acid purification process |
| CN110436416A (en) * | 2019-08-19 | 2019-11-12 | 四川金山制药有限公司 | A kind of technique preparing electronic grade hydrochloric acid except free chlorine |
| CN110562922A (en) * | 2019-08-19 | 2019-12-13 | 四川金山制药有限公司 | Process for producing atomic fluorescent grade hydrochloric acid by gasification method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103213947A (en) * | 2011-05-23 | 2013-07-24 | 江阴润玛电子材料股份有限公司 | Technology for producing ultra-clean high-purity hydrochloric acid |
-
2013
- 2013-05-28 CN CN2013102022744A patent/CN103253634A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103213947A (en) * | 2011-05-23 | 2013-07-24 | 江阴润玛电子材料股份有限公司 | Technology for producing ultra-clean high-purity hydrochloric acid |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104812700A (en) * | 2013-11-28 | 2015-07-29 | 阿克马法国公司 | Hydrochloric acid purification process |
| CN104812700B (en) * | 2013-11-28 | 2018-07-17 | 阿克马法国公司 | The purification process of hydrochloric acid |
| CN110436416A (en) * | 2019-08-19 | 2019-11-12 | 四川金山制药有限公司 | A kind of technique preparing electronic grade hydrochloric acid except free chlorine |
| CN110562922A (en) * | 2019-08-19 | 2019-12-13 | 四川金山制药有限公司 | Process for producing atomic fluorescent grade hydrochloric acid by gasification method |
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Application publication date: 20130821 |