CN110272340B - Sodium lactate decoloring process and application thereof - Google Patents
Sodium lactate decoloring process and application thereof Download PDFInfo
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- CN110272340B CN110272340B CN201910654918.0A CN201910654918A CN110272340B CN 110272340 B CN110272340 B CN 110272340B CN 201910654918 A CN201910654918 A CN 201910654918A CN 110272340 B CN110272340 B CN 110272340B
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- CYDQOEWLBCCFJZ-UHFFFAOYSA-N 4-(4-fluorophenyl)oxane-4-carboxylic acid Chemical compound C=1C=C(F)C=CC=1C1(C(=O)O)CCOCC1 CYDQOEWLBCCFJZ-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 239000001540 sodium lactate Substances 0.000 title claims abstract description 84
- 229940005581 sodium lactate Drugs 0.000 title claims abstract description 84
- 235000011088 sodium lactate Nutrition 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000008569 process Effects 0.000 title claims abstract description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 70
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 39
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims abstract description 38
- LCTONWCANYUPML-UHFFFAOYSA-N Pyruvic acid Chemical compound CC(=O)C(O)=O LCTONWCANYUPML-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 238000004042 decolorization Methods 0.000 claims abstract description 27
- 238000005286 illumination Methods 0.000 claims abstract description 25
- 239000004310 lactic acid Substances 0.000 claims abstract description 19
- 235000014655 lactic acid Nutrition 0.000 claims abstract description 19
- 239000008156 Ringer's lactate solution Substances 0.000 claims abstract description 14
- 229940107700 pyruvic acid Drugs 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000001914 filtration Methods 0.000 claims description 16
- 238000001179 sorption measurement Methods 0.000 claims description 5
- 238000010979 pH adjustment Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 14
- 239000000047 product Substances 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000012467 final product Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 238000005086 pumping Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009298 carbon filtering Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000674 effect on sodium Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/41—Preparation of salts of carboxylic acids
- C07C51/412—Preparation of salts of carboxylic acids by conversion of the acids, their salts, esters or anhydrides with the same carboxylic acid part
-
- 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
-
- 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
- C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to the technical field of sodium lactate preparation, in particular to a sodium lactate decoloring process and application thereof; the method comprises the following steps: (1) slowly adding sodium hydroxide into the lactic acid solution, fully stirring and cooling the reaction system, keeping the reaction temperature within 50-60 ℃, then adjusting the pH of the reaction system to 7.9-8.0, and stopping the reaction to obtain sodium lactate solution containing pyruvic acid impurities; (2) and (2) performing light treatment on the sodium lactate solution in the step (1) by using a light source capable of decomposing pyruvic acid. The invention achieves the aim of auxiliary sodium lactate decolorization by utilizing the illumination process in the production process, is beneficial to improving the quality of the final product and improving the yield of sodium lactate; meanwhile, the consumption of the active carbon is greatly reduced, and the production cost of the product is effectively reduced.
Description
Technical Field
The invention relates to the technical field of sodium lactate preparation, in particular to a sodium lactate decoloring process and application thereof.
Background
This information disclosed in this background of the invention is only for the purpose of increasing an understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
At present, sodium lactate in the industry is prepared by reacting lactic acid with sodium hydroxide or sodium carbonate, and in order to achieve the purposes of reducing cost and simplifying process, high-concentration lactic acid is generally used for reacting with sodium hydroxide, but the color of the generated sodium lactate is often changed into deep yellow, and the color of the sodium lactate is seriously influenced. Therefore, sodium lactate needs to be further decolorized in actual production to improve the quality of sodium lactate. The existing decolorization process of sodium lactate is repeated decolorization by activated carbon. Firstly, sodium lactate and active carbon are mixed, the active carbon and the materials are uniformly mixed by stirring, and the main color development substances of the sodium lactate are removed by repeatedly decoloring for several times. However, the present inventors have found that this method has problems: (1) since the activated carbon cannot be reused and needs to be replaced after being used once, the production cost is increased. (2) Because the active carbon filtration equipment needs manual handling to change, has increased the input of cost of labor. (3) Because the activated carbon is a physical adsorption process, part of sodium lactate is adsorbed while the activated carbon is removed by filtration, so that the concentration of sodium lactate is reduced, and the yield of products is reduced.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a sodium lactate decoloring process and an application thereof. The invention achieves the aim of auxiliary sodium lactate decolorization by utilizing the illumination process in the production process, is beneficial to improving the quality of the final product and improving the yield of sodium lactate; meanwhile, the consumption of the active carbon is greatly reduced, and the production cost of the product is effectively reduced.
The first purpose of the invention is to provide a sodium lactate decoloring process.
The second purpose of the invention is to provide the application of the sodium lactate decoloring technology.
In order to realize the purpose, the invention discloses the following technical scheme:
firstly, the invention discloses a sodium lactate decoloring process, which comprises the following steps: subjecting sodium lactate containing photosensitive impurity components (color development substances) to light irradiation treatment.
In a further aspect, the light irradiation is a light source capable of decomposing a photosensitive impurity component in the sodium lactate.
As a further technical scheme, the photosensitive impurity component is pyruvic acid.
As a further technical scheme, the illumination comprises one or more of illumination by natural light, illumination by a fluorescent lamp or illumination by a light source simulating natural light.
As a further technical solution, the intensity of the illumination may be selected according to the requirement, and accordingly, the illumination time may be appropriately adjusted.
The sodium lactate decoloring process is characterized by comprising the following steps: analysis shows that the root cause of the color of the sodium lactate prepared by using high-concentration lactic acid and sodium hydroxide is that: when lactic acid reacts with sodium hydroxide, the reaction is greatly exothermic, and the reaction system contains oxygen, so that the lactic acid is heated and oxidized into pyruvic acid under alkaline conditions, and after further analysis, the lactic acid is considered as follows: pyruvic acid has the characteristic of easy decomposition by light, so the sodium lactate can be decolored by auxiliary sodium lactate through illumination treatment. Meanwhile, impurities cannot be introduced by adopting illumination.
As a further technical scheme, the sodium lactate decoloring process specifically comprises the following steps:
(1) slowly adding sodium hydroxide into the lactic acid solution, fully stirring and cooling a reaction system, keeping the reaction temperature within 50-60 ℃, then adjusting the pH of the reaction system to be alkaline, and stopping the reaction to obtain sodium lactate solution containing pyruvic acid impurities;
(2) and (2) performing light treatment on the sodium lactate solution in the step (1) by using a light source capable of decomposing pyruvic acid.
As a further technical scheme, before the sodium lactate solution in the step (1) is subjected to light irradiation treatment, the method further comprises a scheme of performing preliminary decolorization by using activated carbon, and specifically comprises the following steps: adding activated carbon with the mass not more than 1 per mill of the solution into the sodium lactate solution obtained in the step (1) to adsorb pyruvic acid, filtering after adsorption is finished, removing the activated carbon, and then performing light treatment on the obtained sodium lactate solution. The process can primarily decolorize sodium lactate, so that the subsequent illumination time is favorably shortened, the advantages of activated carbon adsorption and light irradiation are simultaneously utilized, and the using amount of the activated carbon is reduced to a certain extent.
As a further technical scheme, lactic acid or sodium hydroxide is adopted for pH adjustment of the milk reaction system, so that the purpose of adjustment can be achieved, and impurities cannot be introduced. Preferably, the pH is adjusted to between 7.9 and 8.0.
As a further technical solution, the filtering method comprises: filtering the activated carbon in the coarse filter, and then continuing filtering in the fine filter.
As a further technical scheme, stirring is carried out for 25-35min at the stirring speed of 20-50Hz in the process of adsorbing pyruvic acid by adopting activated carbon.
As a further technical scheme, the illumination treatment is natural illumination for 48-72 h.
Finally, the invention discloses the application of the sodium lactate decoloring process in the chemical field.
Compared with the prior art, the invention has the following beneficial effects:
(1) in the traditional active carbon decoloring process, the production cost is increased because the active carbon can not be recycled. The illumination-assisted decolorization adopted by the invention effectively overcomes the defect of high consumption of activated carbon in the traditional sodium lactate decolorization process, and meanwhile, the illumination treatment does not generate any pollution or residue and is green and environment-friendly.
(2) Because the activated carbon filtering equipment needs manual treatment and replacement, the investment of labor cost is increased, the use amount of activated carbon is greatly reduced through illumination-assisted decolorization, the labor intensity of workers is reduced, and the labor cost investment is reduced.
(3) Because the active carbon is a physical adsorption process, part of sodium lactate is removed while the active carbon is removed by filtering, so that the concentration of the sodium lactate is reduced, and the yield of the product is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a comparison of sodium lactate (left) without decolorization with sodium lactate after 72h of decolorization by the method of example 1.
FIG. 2 shows a comparison of the effect of sodium lactate (left) decolorized for 72h by the method of example 1 and sodium lactate (right) decolorized with activated carbon in comparative example 1.
FIG. 3 comparison of the effect of sodium lactate without decolorization (left), 72h decolorization by the method of example 1 (center), and with activated carbon (right).
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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background, the conventional method for decoloring sodium lactate by using activated carbon alone has many problems. Therefore, the present invention provides a method for decoloring sodium lactate by using light irradiation, and the present invention will be further described with reference to specific embodiments.
Example 1
A sodium lactate decoloring process comprises the following steps:
(1) introducing 1.385t of lactic acid with the mass concentration of 88% into a reaction tank with the capacity of 2.5t, slowly adding 1.07t of sodium hydroxide solution with the mass concentration of 50%, controlling the speed of a stirrer to be 30Hz, and controlling the reaction temperature to be between 50 and 60 ℃; preparing sodium lactate with the mass concentration of 60 percent, adding water to adjust the refractive index to 51.2-51.8 degrees Bx;
(2) leading the sodium lactate prepared in the step (1) out to a filter tank, adding 1 per mill of active carbon of the mass of the sodium lactate into a sodium lactate solution for primary decolorization, stirring for 30 min, controlling the speed of a stirrer to be 30Hz, pumping into a coarse filter for filtering the active carbon after the decolorization is finished, pumping into a fine filter for continuous filtration, and pumping the obtained finished product into a temporary storage tank;
(3) adjusting the pH value of the finished product obtained in the step (2) to 7.9-8.0 by using lactic acid by taking the pH value as an index, and terminating the reaction;
(4) and (4) introducing the sodium lactate obtained in the step (3) into a light-permeable film bag, and naturally illuminating for 48-72h in an airing field. The color values of sodium lactate were measured at different times of light exposure and the results are shown in table 1.
TABLE 1 relationship of color values of sodium lactate to illumination time
| Illumination time/h | 0 | 12 | 24 | 36 | 48 | 60 | 72 |
| Sodium lactate color number/Hazen | 218 | 184 | 143 | 110 | 82 | 54 | 31 |
Example 2
A sodium lactate decoloring process comprises the following steps:
(1) introducing 1.385t of lactic acid with the mass concentration of 88% into a reaction tank with the capacity of 2.5t, slowly adding 1.07t of sodium hydroxide solution with the mass concentration of 50%, controlling the speed of a stirrer to be 30Hz, and controlling the reaction temperature to be between 50 and 60 ℃; preparing sodium lactate with the mass concentration of 60 percent, adding water to adjust the refractive index to 51.2-51.8 degrees Bx;
(2) adjusting the pH value of the finished product obtained in the step (2) to 7.9-8.0 by using lactic acid by taking the pH value as an index, and terminating the reaction;
(3) and (3) introducing the sodium lactate obtained in the step (2) into a light-permeable film bag, and naturally illuminating for 48-72h in an airing field. The color values of sodium lactate were measured at different times of light exposure and the results are shown in table 2.
TABLE 2 sodium lactate color number vs. illumination time
| Illumination time/h | 0 | 12 | 24 | 36 | 48 | 60 | 72 |
| Sodium lactate color number/Hazen | 246 | 203 | 166 | 131 | 114 | 86 | 47 |
Example 3
A sodium lactate decoloring process comprises the following steps:
(1) introducing 1.385t of lactic acid with the mass concentration of 88% into a reaction tank with the capacity of 2.5t, slowly adding 1.07t of sodium hydroxide solution with the mass concentration of 50%, controlling the speed of a stirrer to be 30Hz, and controlling the reaction temperature to be between 50 and 60 ℃; preparing sodium lactate with the mass concentration of 60 percent, adding water to adjust the refractive index to 51.2-51.8 degrees Bx;
(2) adjusting the pH value of the finished product obtained in the step (2) to 7.9-8.0 by using lactic acid by taking the pH value as an index, and terminating the reaction;
(3) and (3) introducing the sodium lactate obtained in the step (2) into a light-permeable film bag, and illuminating the bag for 48-72 hours by using a 1000W fluorescent lamp in an airing factory. The color values of sodium lactate were measured at different times of light exposure and the results are shown in table 2.
TABLE 2 sodium lactate color number vs. illumination time
| Illumination time/h | 0 | 12 | 24 | 36 | 48 | 60 | 72 |
| Sodium lactate color number/Hazen | 246 | 191 | 173 | 139 | 95 | 68 | 36 |
Comparative example
A sodium lactate decoloring process comprises the following steps:
(1) introducing 1.385t of lactic acid with the mass concentration of 88% into a reaction tank with the capacity of 2.5t, slowly adding 1.07t of sodium hydroxide solution with the mass concentration of 50%, controlling the speed of a stirrer to be 30Hz, and controlling the reaction temperature to be between 50 and 60 ℃; preparing sodium lactate with the mass concentration of 60 percent, adding water to adjust the refractive index to 51.2-51.8 degrees Bx;
(2) leading the sodium lactate prepared in the step (1) out to a filter tank, adding 1 per mill of active carbon of the mass of the sodium lactate into a sodium lactate solution for primary decolorization, stirring for 30 min, controlling the speed of a stirrer to be 30Hz, pumping into a strainer after the decolorization is finished, filtering the active carbon, and repeatedly decolorizing with the active carbon for three times; then pumping into a fine filtering device for continuous filtering to obtain a finished product, and pumping into a temporary storage tank;
(3) and (3) adjusting the pH value of the finished product obtained in the step (2) to 7.9-8.0 by using lactic acid by taking the pH value as an index, and terminating the reaction. The results of measuring the relationship between the colorimetric values of sodium lactate and the number of decolorizations of activated carbon in this comparative example are shown in Table 3.
TABLE 3 relationship between sodium lactate color value and activated carbon decolorization frequency
| Decolorization frequency/n of activated carbon | 1 | 2 | 3 |
| Sodium lactate color number/Hazen | 143 | 105 | 43 |
As can be seen from the above-mentioned several embodiments, the decolorization treatment of sodium lactate can be completely realized by the way of light treatment, and the decolorization effect can completely reach the traditional decolorization effect by using only activated carbon. Moreover, the advantage of decoloring by illumination is that only pyruvic acid in sodium lactate is efficiently and exclusively decolored without negative effect on sodium lactate, thereby improving the yield of sodium lactate.
FIGS. 1-3 are graphs showing the effect of sodium lactate which has not been decolorized for 72h by the method of example 1 and is decolorized with activated carbon, and it can be seen that sodium lactate which has not been decolorized is brown, but after 72h of decolorization by the method of example 1, sodium lactate has become transparent and good decolorization effect is achieved; in addition, the effect of decolorization by light irradiation was superior to that of sodium lactate decolorized by activated carbon in example 1.
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 (6)
1. A sodium lactate decoloring process is characterized by comprising the following steps:
(1) slowly adding sodium hydroxide into the lactic acid solution, fully stirring and cooling a reaction system, keeping the reaction temperature within 50-60 ℃, then adjusting the pH of the reaction system to be alkaline, and stopping the reaction to obtain sodium lactate solution containing pyruvic acid impurities;
(2) performing light treatment on the sodium lactate solution in the step (1) by using a light source capable of decomposing pyruvic acid;
the illumination treatment is natural illumination for 48-72 h.
2. The sodium lactate decoloring process according to claim 1, further comprising a scheme of preliminary decoloring with activated carbon before the sodium lactate solution in the step (1) is subjected to light irradiation, specifically: adding activated carbon with the mass not more than 1 per mill of the solution into the sodium lactate solution obtained in the step (1) to adsorb pyruvic acid, filtering after adsorption is finished, removing the activated carbon, and then performing light treatment on the obtained sodium lactate solution.
3. A process for sodium lactate decolorization according to claim 1 or 2, characterized in that lactic acid or sodium hydroxide is used for pH adjustment of the reaction system.
4. A process for the decolorization of sodium lactate according to claim 1 or 2, characterized in that the pH is adjusted to between 7.9 and 8.0.
5. A process for decolorizing sodium lactate as claimed in claim 2,
the filtering method comprises the following steps: filtering the activated carbon in the coarse filter, and then continuing filtering in the fine filter.
6. A process for decolorizing sodium lactate as claimed in claim 2,
and stirring for 25-35min in the process of adsorbing pyruvic acid by using the activated carbon, wherein the stirring frequency is 20-50 Hz.
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