CN115152991A - Treatment method for inhibiting iodine salt from yellowing - Google Patents
Treatment method for inhibiting iodine salt from yellowing Download PDFInfo
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- CN115152991A CN115152991A CN202210793266.0A CN202210793266A CN115152991A CN 115152991 A CN115152991 A CN 115152991A CN 202210793266 A CN202210793266 A CN 202210793266A CN 115152991 A CN115152991 A CN 115152991A
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- salt
- iodine
- yellowing
- sodium hypochlorite
- treatment method
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- 150000002496 iodine Chemical class 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004383 yellowing Methods 0.000 title claims abstract description 12
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 10
- 150000003839 salts Chemical class 0.000 claims abstract description 40
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 19
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims description 7
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 239000000460 chlorine Substances 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 238000004448 titration Methods 0.000 claims description 3
- 238000007605 air drying Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 10
- 239000012267 brine Substances 0.000 abstract description 6
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract description 6
- 238000000746 purification Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 235000002639 sodium chloride Nutrition 0.000 description 35
- 239000000523 sample Substances 0.000 description 17
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 9
- 229910052740 iodine Inorganic materials 0.000 description 9
- 239000011630 iodine Substances 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000013068 control sample Substances 0.000 description 3
- 238000002845 discoloration Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 3
- 241000894007 species Species 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 241001106462 Ulmus Species 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-M iodide Chemical compound [I-] XMBWDFGMSWQBCA-UHFFFAOYSA-M 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- JLKDVMWYMMLWTI-UHFFFAOYSA-M potassium iodate Chemical compound [K+].[O-]I(=O)=O JLKDVMWYMMLWTI-UHFFFAOYSA-M 0.000 description 2
- 239000001230 potassium iodate Substances 0.000 description 2
- 235000006666 potassium iodate Nutrition 0.000 description 2
- 229940093930 potassium iodate Drugs 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 206010067997 Iodine deficiency Diseases 0.000 description 1
- 241001466077 Salina Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229940006461 iodide ion Drugs 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 235000006479 iodine deficiency Nutrition 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000276 potassium ferrocyanide Substances 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- XOGGUFAVLNCTRS-UHFFFAOYSA-N tetrapotassium;iron(2+);hexacyanide Chemical compound [K+].[K+].[K+].[K+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] XOGGUFAVLNCTRS-UHFFFAOYSA-N 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
- A23L27/40—Table salts; Dietetic salt substitutes
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
- A23L29/015—Inorganic compounds
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
- A23L5/40—Colouring or decolouring of foods
- A23L5/41—Retaining or modifying natural colour by use of additives, e.g. optical brighteners
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Nutrition Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention discloses a treatment method for inhibiting iodine salt from yellowing, and relates to the technical field of edible refined salt treatment. The method has the beneficial effects that sodium hypochlorite is added into the wet salt, so that the reducing substances in the iodized salt can be effectively removed, the content of the reducing substances in the salt is far less than that of the reducing substances in the brine, the cost is greatly reduced, the purification process is simplified, and a solution is provided for the color change of the iodized salt.
Description
Technical Field
The invention relates to the technical field of edible refined salt treatment, in particular to a treatment method for inhibiting iodine salt from yellowing.
Background
With the popularization of iodized table salt, the phenomenon of yellowing of table salt sometimes occurs. The produced iodized salt has the phenomenon that the inner film of a package and a product are slightly yellow, and the phenomenon tends to increase gradually. Adverse effects are caused in salt industry companies and consumers, the user reaction is large, and the sales market is seriously influenced; meanwhile, the iodine content loss of the salt after yellowing is 2-3 ppm, which causes the iodine intake of residents to be insufficient, thereby causing iodine deficiency.
Therefore, finding out the reason for the iodine salt to yellow and adopting an effective method to inhibit the iodine salt from discoloring has important significance for the iodine intake meeting the standard.
The oxidation reasons are mainly as follows:
(1) The brine composition changes
The formation conditions change greatly with time, H in brine 2 S and other sulfides and Fe 2+ When the content of reducing substances is increased, S in the salt is generated 2- 、Fe 2+ 、I - The remaining amount of the plasma reducing ions increases. IO (input/output) 3 - Is very easy to react with S contained in the iodized salt 2- 、Fe 2+ The reducing ions react, resulting in loss of iodine.
(2) Influence of iodide ion and pH in iodized salt
Under acidic conditions, KIO 3 And natural iodine in an iodine salt, the following reactions can occur:
5I - +IO 3 - +6H + →3I 2 +3H 2 O
(3) Water content in iodized salt and Ca content in salt 2+ 、Mg 2+ Influence of (2)
The iodine salt has high water content, especially Ca in salt 2+ 、Mg 2+ When the content of the iodine salt is high, the iodine salt inevitably absorbs moisture seriously during transportation, storage, sale and use.
MgCI 2 +H 2 O→MgO+2HCI
CaCI 2 +H 2 O→CaO+2HCI
(4) Fe in iodized salt 3+ Influence of (2)
In the process of salt production, fe is brought into salt due to corrosion of equipment and pipelines 3+ Is inevitable. When Fe 3+ At higher contents, where the salt contains natural iodine, the following reactions occur:
2Fe 3+ +2I - →I 2 +Fe 2+
(5) Influence of the transport and storage Environment
The salt bin has damp environment and bad ventilation, the moisture absorption is very serious, and the iodine salt color change is accelerated inevitably.
Currently, methods for inhibiting iodine salt discoloration include:
(1) Improved packaging
The loss of iodine is significantly reduced by packaging the salt in an effective moisture barrier such as a solid low density polyethylene bag, reducing the moisture content of the iodine salt and the permeation of gas during storage, but there is still a significant loss of iodine after 12 months of storage.
(2) Increasing the alkalinity of the salt
By addition of alkali to iodized salt, the [ H ] is reduced + ]In order to reduce the loss of iodine. However, this method also has problems in that wet salt containing a large amount of lye is difficult to dry in the fluidized bed dryer. Because of the high water content of the wet salt and the high cost of this process.
(3) Heating iodized salt
The iodide salt is stable when heated at high temperatures for several hours, but has disadvantages. The potassium iodate added to the salt is partially reduced and lost during the heating process and the cost of adding iodine to the salt will increase.
Disclosure of Invention
In order to solve the technical problem of the yellowing of the iodized salt, the invention discloses a treatment method for inhibiting the yellowing of the iodized salt.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment method for inhibiting iodine salt yellowing comprises the steps of spraying sodium hypochlorite solutions with different amounts into a plurality of wet salt samples, respectively placing the wet salt samples into an air drying oven for heating and drying, and finally, measuring the total reducing substance amount in iodine salt by a titration method for the plurality of dried wet salt samples.
Further, the mass ratio of the wet salt sample to the sodium hypochlorite solution is 10:0.005, 10:0.01, 10:0.02, 10:0.05.
furthermore, the content of available chlorine in the sodium hypochlorite solution is 5%, and the concentration of the NaClO solution is 120g/L.
Furthermore, the temperature of the air-blast drying oven is controlled to be 100-140 ℃, and the drying time is 20-26 hours.
The method has the beneficial effects that sodium hypochlorite is added into the wet salt, so that reducing substances in the iodized salt can be effectively removed, and the content of the reducing substances in the salt is far less than that of the reducing substances in the brine, so that the cost is greatly reduced, and the purification process is simplified.
The feasibility of the scheme is also proved through a sodium hypochlorite removal test and a treated placement test, and a solution is provided for iodine salt discoloration.
Drawings
FIG. 1 is a schematic view of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An oxidizing agent is added to the wet salt to remove reducing species, and we choose to purify the wet salt because the amount of reducing species in the wet salt is less than the amount of reducing species in the brine, and it is easier and less costly to purify the salt than to purify the brine. The experiments for removing the reduced substances from the iodized salts were carried out on a laboratory scale.
(1) Purification of wet salt
The iodine salt used in the test is obtained from Ulmus salina GmbH in Shaanxi elm, and all samples are randomly selected. Potassium iodate, sodium hypochlorite and potassium ferrocyanide, which are analytically pure, were purchased from kyou chemical reagents ltd, tianjin; concentrated sulfuric acid, sodium hydroxide, potassium permanganate, potassium iodide, potassium dichromate, sodium thiosulfate, all analytically pure, purchased from Shanghai Aladdin Biotechnology, inc.
The experimental procedure is shown in figure 1.
First, 5 parts of 10g of each wet salt sample were placed in a glass petri dish, and 100 mL of a sodium hypochlorite solution prepared with 5% available chlorine was placed in a spray bottle containing about 0.005mL of NaClO per one spray.
And spraying 5 parts of the prepared sodium hypochlorite solution on 5 parts of wet salt samples in sequence, wherein the spraying is performed for 0 time, 1 time, 2 times, 4 times and 10 times respectively, and the wet salt samples sprayed with the NaClO solution are respectively marked as a control sample, an experimental sample 1, an experimental sample 2, an experimental sample 3 and an experimental sample 4.
And finally, respectively putting the control sample, the experimental sample 1, the experimental sample 2, the experimental sample 3 and the experimental sample 4 into an air-blast drying box, and air-blast drying for 24 hours at 120 ℃.
The amount of total reduced matter in the iodized salt was measured by titration on the dried sample, and the experimental results are shown in table 1.
TABLE 1
| Description of the samples | Adding amount of NaClO | Total reductants/(mg/L) | Removal rate/%) |
| Control sample | 0 | 2.2 | 0 |
| Experimental sample 1 | 0.005mL | 1.4 | 36.36 |
| Experimental sample 2 | 0.01mL | 0.8 | 63.64 |
| Experimental sample 3 | 0.02mL | 0.7 | 68.18 |
| Experimental sample 4 | 0.05mL | 0.2 | 90.90 |
As can be seen from table 1 above, sodium hypochlorite can effectively remove the reduced substances in the iodine salt, and as the concentration of sodium hypochlorite increases, the content of the reduced substances in the wet salt decreases.
The experiment shows that: when 0.05mL of sodium hypochlorite solution was added to 10g of wet salt, the removal rate of the reduced matter was the best, and reached 90.90%.
In the experiment, the excess sodium hypochlorite was completely decomposed, and the generated oxygen was blown out at a high temperature (120 ℃) for about 6 minutes. The odor similar to bleach disappeared completely.
(2) Storage test
After the experimental sample 4 was stored for 1 month, 2 months, 3 months, 6 months, 12 months and 18 months, respectively, the whiteness of the sample was measured to determine whether sodium hypochlorite plays a key role in solving the iodine salt discoloration problem, and the experimental results are shown in table 2.
TABLE 2
| Storage time (moon) | 1 | 2 | 3 | 6 | 12 | 18 |
| Whiteness (degree) | 85.3 | 85.0 | 84.6 | 84.3 | 84.2 | 84.0 |
From these data, it can be seen that the whiteness of the iodized salt sprayed with the sodium hypochlorite solution is relatively stable for a long period of time, and although the whiteness is slightly reduced with time, no obvious color change occurs, which indicates that the problem of iodine salt color change can be solved by adding a small amount of sodium hypochlorite.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.
Claims (4)
1. A treatment method for inhibiting iodine salt yellowing is characterized in that sodium hypochlorite solutions with different amounts are sprayed into a plurality of wet salt samples respectively, the wet salt samples are placed in an air-blast drying box to be heated and dried respectively, and finally the plurality of dried wet salt samples are used for measuring the total reducing substance amount in iodine salt respectively by a titration method.
2. The treatment method for inhibiting iodine salt yellowing according to claim 1, wherein the mass ratio of the wet salt sample to the sodium hypochlorite solution is 10:0.005, 10:0.01, 10:0.02, 10:0.05.
3. the method according to claim 1, wherein the sodium hypochlorite solution has an available chlorine content of 5% and the NaClO solution has a concentration of 120g/L.
4. The treatment method for inhibiting the yellowing of iodized salt as set forth in claim 1, wherein the temperature of the forced air drying oven is controlled at 100-140 ℃ and the drying time is 20-26 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210793266.0A CN115152991A (en) | 2022-07-05 | 2022-07-05 | Treatment method for inhibiting iodine salt from yellowing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210793266.0A CN115152991A (en) | 2022-07-05 | 2022-07-05 | Treatment method for inhibiting iodine salt from yellowing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115152991A true CN115152991A (en) | 2022-10-11 |
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ID=83490816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210793266.0A Pending CN115152991A (en) | 2022-07-05 | 2022-07-05 | Treatment method for inhibiting iodine salt from yellowing |
Country Status (1)
| Country | Link |
|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110008497A1 (en) * | 2004-12-24 | 2011-01-13 | Pushpito Kumar Ghosh | Iodized Salt and a Process for Its Preparation |
| CN102515205A (en) * | 2011-11-24 | 2012-06-27 | 四川顺城化工股份有限公司 | Process for removing sulfides from brine |
| CN109645433A (en) * | 2017-10-10 | 2019-04-19 | 江苏苏盐井神股份有限公司 | A kind of potassium iodide salt compounded of iodine and its production method |
-
2022
- 2022-07-05 CN CN202210793266.0A patent/CN115152991A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110008497A1 (en) * | 2004-12-24 | 2011-01-13 | Pushpito Kumar Ghosh | Iodized Salt and a Process for Its Preparation |
| CN102515205A (en) * | 2011-11-24 | 2012-06-27 | 四川顺城化工股份有限公司 | Process for removing sulfides from brine |
| CN109645433A (en) * | 2017-10-10 | 2019-04-19 | 江苏苏盐井神股份有限公司 | A kind of potassium iodide salt compounded of iodine and its production method |
Non-Patent Citations (1)
| Title |
|---|
| 张昆: "食用盐的变色研究及检测方法", 《中国井矿盐》, pages 30 - 34 * |
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