CN113999109A - System and method for removing floccules in concentrated formic acid product - Google Patents
System and method for removing floccules in concentrated formic acid product Download PDFInfo
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- CN113999109A CN113999109A CN202111349484.7A CN202111349484A CN113999109A CN 113999109 A CN113999109 A CN 113999109A CN 202111349484 A CN202111349484 A CN 202111349484A CN 113999109 A CN113999109 A CN 113999109A
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- formic acid
- adsorbent
- exchange resin
- ion exchange
- acid product
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- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 title claims abstract description 202
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 235000019253 formic acid Nutrition 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 24
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 28
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 28
- 239000003463 adsorbent Substances 0.000 claims abstract description 27
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000005406 washing Methods 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000012190 activator Substances 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 150000007524 organic acids Chemical class 0.000 claims description 2
- 230000008929 regeneration Effects 0.000 claims description 2
- 238000011069 regeneration method Methods 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims 1
- 230000001172 regenerating effect Effects 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 7
- 239000011347 resin Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000002572 peristaltic effect Effects 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- -1 titanium ions Chemical class 0.000 description 3
- 239000003729 cation exchange resin Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/47—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention discloses a system and a method for removing floccules of a concentrated formic acid product. The metal ions in the concentrated formic acid are removed by adopting the adsorbent or the ion exchange resin, so that the concentration of the metal ions is reduced, the concentration centers of impurities in the product are reduced, and stable floccules are difficult to form, thereby effectively solving the problem that floccules are easy to generate in the concentrated formic acid product. The formic acid content of concentrated formic acid, especially 99% formic acid, reaches the standard, and the rest impurities are in the standard range, so that the quality of formic acid products and the sale of formic acid products are not influenced.
Description
Technical Field
The invention belongs to the technical field of formic acid preparation, and particularly relates to a system and a method for removing floccules of a concentrated formic acid product.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The formic acid is produced by adopting a methyl formate hydrolysis process, concentrated formic acid products such as 99% formic acid and the like are obtained after rectification and concentration, the product standard is colorless and transparent, but floccules often appear in the prepared concentrated formic acid product, the appearance of the concentrated formic acid product is influenced by the generation of the floccules, further the sale of the concentrated formic acid product is not facilitated, and the removal effect is poor when the floccules are subjected to filtration treatment.
Disclosure of Invention
In view of the above technical problems, the present invention aims to provide a removal system agent removal method for removing floc of a concentrated formic acid product.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a concentrated formic acid product floc removal system, which comprises a purifier filled with an adsorbent or an ion exchange resin.
In a second aspect, the present invention provides a method for removing floc from a concentrated formic acid product, comprising the following steps: treating concentrated formic acid containing floccule with adsorbent or ion exchange resin until the metal ion concentration therein is reduced to a set value.
The beneficial effects of the invention are as follows:
the filtration is a simple and effective method for removing solid impurities in liquid, but the inventor finds that the effect of removing floccules by using the filtration method is not good when filtering concentrated formic acid solution containing floccules.
Therefore, the inventor researches the reason for generating the floc in the concentrated formic acid, and carries out component detection on the concentrated formic acid and the purer concentrated formic acid sold in the market, and finds out through comparison that the concentration of the metal ions in the concentrated formic acid generating the floc is higher, especially the concentration of the titanium ions with the valence of 4 is higher, and through analysis, the reason for the overhigh concentration of the metal ions is that the slight corrosion of equipment can be caused in the production process of the high-concentration formic acid, and various impurities in the concentrated formic acid can be gathered by taking the metal ions as the center to form the aggregate of various metal elements and other impurities, namely the floc, so that the product quality of the concentrated formic acid is influenced.
When the filter membrane is filtered, the floccules are scattered, and various substances can continuously gather by taking the metal ions as the center after penetrating through the filter membrane, so that the floccules can be continuously generated.
In the invention, the metal ions in the concentrated formic acid are removed by adopting the adsorbent or the ion exchange resin, so that the concentration of the metal ions is reduced, the impurity aggregation center in the product is reduced, and further stable floccule is difficult to form, and further the problem that the floccule is easy to generate in the concentrated formic acid product is effectively solved. The formic acid content of concentrated formic acid, especially 99% formic acid, reaches the standard, and the rest impurities are in the standard range, so that the quality of formic acid products and the sale of formic acid products are not influenced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a 99% formic acid treatment process according to one or more embodiments of the invention.
In the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein, 1-a flow meter; 2. a purifier; 3. a sampling valve; 4. a sampling valve; 5. a stop valve; 6. and a stop valve.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In a first aspect, the present invention provides a concentrated formic acid product floc removal system, which comprises a purifier filled with an adsorbent or an ion exchange resin.
In some embodiments, the purifier is connected to the formic acid product source via a liquid inlet line and to the product receiving tank via a liquid outlet line.
Further, be provided with first sample branch road on the inlet channel, be provided with second sample branch road on the liquid outlet channel, all be provided with the stop valve on first sample branch road and the second sample branch road.
And respectively carrying out sampling detection on the untreated formic acid product and the treated formic acid product through a first sampling branch and a second sampling branch.
Further, a flow meter is arranged on the liquid inlet pipeline. The flow rate of the formic acid product is controlled by arranging the flow meter so as to ensure the treatment effect of the formic acid product.
In a second aspect, the present invention provides a method for removing floc from a concentrated formic acid product, comprising the following steps: treating concentrated formic acid containing floccule with adsorbent or ion exchange resin until the metal ion concentration therein is reduced to a set value.
In some embodiments, the set point is a concentration of +4 valent titanium ions below 0.2 ppm. Tests show that when the concentration of the + 4-valent titanium ions is higher than 0.2ppm, the concentrated formic acid product generates floccules.
In some embodiments, the flow rate of concentrated formic acid to the adsorbent or ion exchange resin during the treatment is from 0.1 to 1.2m3/h。
Further, the residence time of the concentrated formic acid in the adsorbent or the ion exchange resin is 0.08 to 1 hour.
In some embodiments, the adsorbent is activated carbon.
In some embodiments, the adsorbent or ion exchange resin is charged to the reactor using pure water. Because the activated carbon is a small particulate material, the resin is opaque spherical particles, the particle size is small, the filling is not easy, the abrasion can be reduced by filling the resin into the reactor from the top by using pure water flowing, and the water can be drained through a drain valve of the device.
Further, replacing water in the reactor with formic acid solution, draining the formic acid solution, and introducing the concentrated formic acid product to be treated into the reactor. Since the concentration of formic acid is affected by the water content in the resin, the substitution is performed first, in order to ensure that the 99% concentration is acceptable.
Further, the concentration of the formic acid solution is the same as the concentration of the concentrated formic acid product to be treated.
Still further, the volume ratio of the formic acid solution to the adsorbent or ion exchange resin to be treated is 1.5-2: 1.
Furthermore, the method also comprises the step of pretreating the adsorbent or the ion exchange resin before the formic acid solution is used for replacing the water in the reactor.
And further, activating the activated carbon by using an acidic activating agent.
Preferably, the acidic activator is 1mol/L hydrochloric acid solution.
And further, carrying out pretreatment on the ion exchange resin by sequentially adopting acid washing, alkali washing and water washing.
In some embodiments, the adsorbent or ion exchange resin is deactivated and then regenerated.
Further, the regeneration process is as follows: firstly, washing the adsorbent or the ion exchange resin by using an acid solution, then washing the adsorbent or the ion exchange resin to be neutral by using desalted water, then replacing the desalted water by using a formic acid solution, and finally draining the formic acid solution.
Further, the formic acid solution is at the same concentration as the formic acid product to be treated.
Further, the acid solution is nitric acid, hydrochloric acid, sulfuric acid, hydrofluoric acid, phosphoric acid or an organic acid.
Example 1
Selecting 100ml of PAM resin (polyacrylamide ion exchange resin), filling the PAM resin into a glass column by using pure water, and carrying out acid washing (5% HCl, treatment for 2h), alkali washing (5% NaOH, treatment for 2h) and water washing (desalted water washing shows neutrality); and replacing water in the solution with 99% formic acid solution, conveying 99% formic acid flow reaction substances by using a peristaltic pump, controlling the flow at 10ml/min, and detecting the change of the content of main metal ions in the solution before and after treatment: the zinc element is reduced to 0.0056ppm from 0.0282ppm, the iron element is reduced to 0.0212ppm from 0.0778ppm, and the titanium element is reduced to 0.0061ppm from 0.0447 ppm. The treated 99% formic acid was colorless and transparent.
Comparative example 1
The difference from example 1 is that: the resin was not pretreated by acid washing-alkali washing and water washing, and the rest was the same as in example 1.
The purified 99% formic acid solution showed a pale yellow color with zinc from 0.0550ppm to 0.0456ppm, iron from 0.0971ppm to 0.0428ppm, and titanium from 0.0447ppm to 0.0089 ppm. )
Example 2
Selecting 100ml of KIP242 type purification resin (cation exchange resin), purchasing from Kary environmental protection company in Hebei, filling pure water into a glass column, pretreating the substance with formic acid solution (the treatment amount is 1.5-2 times of the volume of the reaction substance), conveying 99% formic acid flow reaction substance by using a peristaltic pump, adjusting the flow rate to 5ml/min, 10ml/min and 20ml/min respectively, after running for 24 hours, reducing the zinc element content in the solution from 0.1505ppm to 0.0585ppm, 0.0294ppm and 0.0295ppm respectively, reducing the iron element content from 0.5271ppm to 0.1195ppm, 0.0214ppm and 0.0287ppm respectively, and reducing the titanium element content from 0.5971ppm to 0.0062ppm, 0.0021ppm and 0.0030ppm respectively.
Tests show that when the flow rate is small, the treatment effect is rather poor, and the analysis reason is as follows: when the flow rate of formic acid is small, the exchanged ions are easily re-diffused into the solution, resulting in poor treatment effect.
Treating the resin by using pure water and 1mol/l hydrochloric acid in sequence, then loading the resin into a glass column for experiment, controlling the flow rate of the material to be 10ml/min, and detecting the content of main metal ions in the solution before and after reaction: the content of zinc element is reduced from 0.0075ppm to 0.0026ppm, the content of iron element is reduced from 0.0241ppm to 0.0199ppm, and the content of titanium element is reduced from 0.1433ppm to 0.0029 ppm. The treated 99% formic acid is colorless and transparent.
Example 3
Selecting 0.1m3KIP242 type purification resin (cation exchange resin), purchased from environmental protection of Kery, Hebei, filled into a reactor with pure water, replaced the water in the reaction mass with 99% formic acid, detected with pH paper 2-3 and the solution clarified, then the replacement is completed; adjusting the flow meter to convey materials, wherein the flow rate is set to be 0.1m3After running for about 140 hours, the contents of main metal elements such as zinc, iron, titanium and the like are basically unchanged (even slightly increased) before and after solution treatment, reaction substances are invalid, and the total treatment is 44.44m3Formic acid solution; the mixture was treated with nitric acid and then put into operation at a flow rate of 0.1m3And/h, the effect is lost after 80 days of use.
Example 4
Selecting 100ml of activated carbon, filling the activated carbon into a glass column, pretreating the substance by using a formic acid solution (the treatment amount is 2-3 times of the volume of the reaction substance), conveying 99% formic acid flow reaction substance by using a peristaltic pump, controlling the flow rate to be 10ml/min, detecting the change of the content of main metal ions in the solution before and after treatment, wherein the content of zinc is reduced from 0.0184ppm to 0.0128ppm, the content of titanium is reduced from 0.0875ppm to 0.0125ppm, the content of iron is increased from 0.0460ppm to 1.0212ppm, and the content of chlorine is increased from 0.0261ppm to 1.4278 ppm.
The treated 99% formic acid was colorless and transparent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A removal system of concentrated formic acid product flocculus which characterized in that: comprises a purifier, wherein the purifier is filled with adsorbent or ion exchange resin.
2. The concentrated formic acid product floe removal system of claim 1, wherein: the purifier is connected with a formic acid product source through a liquid inlet pipeline and is connected with a product receiving tank through a liquid outlet pipeline;
furthermore, a first sampling branch is arranged on the liquid inlet pipeline, a second sampling branch is arranged on the liquid outlet pipeline, and stop valves are arranged on the first sampling branch and the second sampling branch;
further, a flow meter is arranged on the liquid inlet pipeline. The flow rate of the formic acid product is controlled by arranging the flow meter so as to ensure the treatment effect of the formic acid product.
3. A method for removing floccules of a concentrated formic acid product is characterized by comprising the following steps: the method comprises the following steps: concentrated formic acid containing floc is treated with an adsorbent or ion exchange resin until the metal ion concentration is reduced to 0.2 ppm.
4. A method of removing concentrated formic acid product floe as defined in claim 3, wherein: the flow rate of the concentrated formic acid relative to the adsorbent or ion exchange resin during the treatment is 0.1-1.2m3/h；
Further, the retention time of the concentrated formic acid in the adsorbent or the ion exchange resin is 0.08-1 h;
further, the adsorbent is activated carbon.
5. A method of removing concentrated formic acid product floe as defined in claim 3, wherein: filling the adsorbent or ion exchange resin into a reactor by adopting pure water;
further, replacing water in the reactor with formic acid solution, draining the formic acid solution, and introducing a concentrated formic acid product to be treated into the reactor;
further, the concentration of the formic acid solution is the same as that of the concentrated formic acid product to be treated;
still further, the volume ratio of the formic acid solution to the adsorbent or ion exchange resin to be treated is 1.5-2: 1.
6. A method of removing concentrated formic acid product floe as defined in claim 3, wherein: before the formic acid solution is used for replacing water in the reactor, the method also comprises the step of pretreating the adsorbent or the ion exchange resin;
further, activating the activated carbon by using an acidic activating agent;
preferably, the acidic activator is 1mol/L hydrochloric acid solution;
and further, carrying out pretreatment on the ion exchange resin by sequentially adopting acid washing, alkali washing and water washing.
7. A method of removing concentrated formic acid product floe as defined in claim 3, wherein: after the adsorbent or the ion exchange resin is out of service, the method also comprises the step of regenerating the adsorbent or the ion exchange resin.
8. The method of removing concentrated formic acid product floe of claim 7, wherein: the regeneration process comprises the following steps: firstly, washing the adsorbent or the ion exchange resin by using an acid solution, then washing the adsorbent or the ion exchange resin to be neutral by using desalted water, then replacing the desalted water by using a formic acid solution, and finally draining the formic acid solution.
9. The method of removing concentrated formic acid product floe of claim 8, wherein: the concentration of the formic acid solution is the same as the concentration of the formic acid product to be treated.
10. The method of removing concentrated formic acid product floe of claim 8, wherein: the acid solution is nitric acid, hydrochloric acid, sulfuric acid, hydrofluoric acid, phosphoric acid or organic acid.
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| CN202111349484.7A CN113999109A (en) | 2021-11-15 | 2021-11-15 | System and method for removing floccules in concentrated formic acid product |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111349484.7A CN113999109A (en) | 2021-11-15 | 2021-11-15 | System and method for removing floccules in concentrated formic acid product |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3450754A (en) * | 1966-12-12 | 1969-06-17 | Us Rubber Co | Purification of formic acid |
| GB9100216D0 (en) * | 1991-01-05 | 1991-02-20 | Bp Chem Int Ltd | Process |
| US20110319657A1 (en) * | 2010-06-29 | 2011-12-29 | Basf Se | Process for the Preparation of Formic Acid |
| US20160016799A1 (en) * | 2014-07-18 | 2016-01-21 | Oci Company Ltd. | Method for removing metal ions in phosphoric acid solution |
| JP2020015684A (en) * | 2018-07-25 | 2020-01-30 | 日東電工株式会社 | Method for concentrating formic acid solution, and method for producing formic acid solution |
| CN211435300U (en) * | 2019-10-24 | 2020-09-08 | 聊城鲁西甲酸化工有限公司 | High-precision filtering device for formic acid product |
-
2021
- 2021-11-15 CN CN202111349484.7A patent/CN113999109A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3450754A (en) * | 1966-12-12 | 1969-06-17 | Us Rubber Co | Purification of formic acid |
| GB9100216D0 (en) * | 1991-01-05 | 1991-02-20 | Bp Chem Int Ltd | Process |
| US20110319657A1 (en) * | 2010-06-29 | 2011-12-29 | Basf Se | Process for the Preparation of Formic Acid |
| US20160016799A1 (en) * | 2014-07-18 | 2016-01-21 | Oci Company Ltd. | Method for removing metal ions in phosphoric acid solution |
| JP2020015684A (en) * | 2018-07-25 | 2020-01-30 | 日東電工株式会社 | Method for concentrating formic acid solution, and method for producing formic acid solution |
| CN211435300U (en) * | 2019-10-24 | 2020-09-08 | 聊城鲁西甲酸化工有限公司 | High-precision filtering device for formic acid product |
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| Title |
|---|
| 王洪伟等: "《环境功能材料》", 31 July 2021, 吉林出版集团股份有限公司, pages: 83 * |
| 韩延德: "《核电厂水化学》", 31 December 2010, 原子能出版社, pages: 135 * |
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