CN1161384C - Method for effectively reducing chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite - Google Patents
Method for effectively reducing chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite Download PDFInfo
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- CN1161384C CN1161384C CNB021153035A CN02115303A CN1161384C CN 1161384 C CN1161384 C CN 1161384C CN B021153035 A CNB021153035 A CN B021153035A CN 02115303 A CN02115303 A CN 02115303A CN 1161384 C CN1161384 C CN 1161384C
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Abstract
The present invention relates to a method for effectively reducing chlorine gas generation amount when gracilaria verrucosa is bleached by a method using sodium hypochlorite. Gas amount generated when gracilaria verrucosa is bleached by a method using sodium hypochlorite is effectively reduced by alkaline treatment, pre-acidification, cleaning, sodium hypochlorite bleaching, the re-acidification of oxalic acid, and post-treatment, and the generated chlorine gas amount is controlled within the range of a national safety standard. The healthy body of a production worker and no surrounding environmental pollution are ensured; meanwhile, the quality index of a product is ideal, and thereby, a chlorine gas absorption device does not need to be arranged by an enterprise. The chlorine gas concentration of a workshop and surrounding environment is within the range of a safety index. The working procedure that chlorine gas pollution is treated by the enterprise is reduced, production cost is lowered, and the survival ability of the enterprise is enhanced. The present invention has the advantages of reasonable design, very little generated chlorine gas and favorable social benefit and economic effect; the chlorine gas concentration above a bleaching pool is from 0.02 to 0.09 mg/m<3>, and is below the requirement of the national safety standard; the quality of the product is greatly enhanced; the present invention is suitable for popularization and use.
Description
Technical field
The method that the present invention effectively reduces chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite belongs to chemical field, during particularly with sodium-hypochlorite process bleaching fragrant plant mentioned in ancient texts, reduces the method for chlorine generation.
Background technology
At present, the most of enterprises in ground such as Guangdong, Guangxi, Hainan mainly adopt clorox that fragrant plant mentioned in ancient texts is bleached when producing agar-agar with fragrant plant mentioned in ancient texts, although each enterprise of auxiliary material and feeding mode is different, but produce the problem of different concns chlorine when all existing the bleaching fragrant plant mentioned in ancient texts basically, part enterprise adopts the method that absorbs to handle, and many enterprises do not do any processing, allow chlorine in the workshop and surrounding environment spread naturally, it is healthy and polluted environment to have had a strong impact on the workman.
Summary of the invention
The method that the purpose of this invention is to provide a kind of effective minimizing chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite, through alkaline purification, sodium hypochlorite bleaching and aftertreatment, reduce the amount of chlorine that produces with sodium-hypochlorite process bleaching fragrant plant mentioned in ancient texts effectively, and the amount of chlorine that makes generation is controlled in the national safety standard scope, guarantee that the direct labor is healthy and do not pollute surrounding environment, the quality index of product is also more satisfactory simultaneously, thereby make the unnecessary chlorine absorption unit that is provided with of enterprise, workshop and surrounding environment chlorine gas concentration are in safety index, reduce business processes chlorine and pollute this operation, reduce production cost, strengthened the viability of enterprise.
The present invention includes following processing step:
(1) alkaline purification
Fragrant plant mentioned in ancient texts is used 20-30%NaOH concentration solution-treated, and treatment temp is 60～70 ℃, and 16 hours, water flushing after the alkaline purification, immersion fragrant plant mentioned in ancient texts were to neutral;
(2) bleaching
A, acidifying: preparation contains 0.24-0.35%HCI concentration solution fragrant plant mentioned in ancient texts is carried out acidifying, under the normal temperature, and 5 minutes time;
B, cleaning: in time drain acidizing fluid after the acidifying, water flushing 1-2 time adds water then and treats next step processing in right amount;
C, sodium hypochlorite bleaching: acidifying, cleaned fragrant plant mentioned in ancient texts place the chlorine bleach liquor of 0.07-0.10% available chlorine to bleach, and bleaching time is 10 minutes under the normal temperature, drain sodium hypochlorite bleaching liquid, add water to original volume;
The acidifying once more of d, oxalic acid solution, brighten: add 5% oxalic acid solution, the preparation acidizing fluid, concentration is 0.04-0.07%H
2C
2O
4, fragrant plant mentioned in ancient texts is carried out the acidifying second time, brightens, 5 minutes following treatment times of normal temperature;
(3) aftertreatment
Fragrant plant mentioned in ancient texts water after the bleaching washes, is dipped to neutrality, by the 15-25 times of water yield of fragrant plant mentioned in ancient texts dry weight, drops into fragrant plant mentioned in ancient texts during with the water ebuillition of heated and carries glue, carries 30-40 minute glue time.
Made the strip product in freezing 12-36 hour through-18 ℃.Make powder-like product through squeezing, pulverizing 60-200 order.
The present invention is reasonable in design, and the chlorine of generation is considerably less, and the chlorine gas concentration of Bellmer top is at 0.02～0.09mg/m
3, being lower than the requirement of national safety standard, quality product also is greatly improved, and has good social benefit and economic benefit, should promote the use of.
Embodiment
In the present invention,
1, alkaline purification: warm concentrated base method is handled fragrant plant mentioned in ancient texts in the employing, and it is different and different that NaOH concentration is looked fragrant plant mentioned in ancient texts, gel content height, the NaOH concentration height that fiber is few, on the contrary low.The concentration of Gracilaria tenuistipitata use NaOH is 28% in this test, and carefully fragrant plant mentioned in ancient texts is 20%.65 ℃ of treatment temps, 16 hours time, water flushing after the alkaline purification, immersion fragrant plant mentioned in ancient texts are to neutral.
2, bleaching
(1) acidifying: the solution that preparation contains 0.24-0.35%HCI concentration carries out acidifying to fragrant plant mentioned in ancient texts, Gracilaria tenuistipitata is handled with 0.35%HCI concentration acidizing fluid with 0.24%HCI concentration, thin fragrant plant mentioned in ancient texts, under the normal temperature, 5 minutes time, should notice that acidizing fluid concentration is unsuitable too high, though fragrant plant mentioned in ancient texts is more easily bleached when too high, rate of gum output improves, and the product gel-strength has obvious decline.And if acidizing fluid concentration is on the low side, then all there is decline in various degree in the whiteness of rate of gum output and product.
(2) clean: in time drain acidizing fluid after the acidifying, water flushing 1～2 time adds water then and treats next step processing in right amount.
(3) sodium-hypochlorite process bleaching: acidifying, cleaned fragrant plant mentioned in ancient texts place the chlorine bleach liquor who contains 0.07-0.10% available chlorine to bleach, and bleaching time is 10 minutes under the normal temperature.Drain sodium hypochlorite bleaching liquid, add water to original volume.
(4) oxalic acid solution acidifying once more, brighten: add 5% oxalic acid solution, the allotment acidizing fluid, concentration is that 0.05% (Gracilaria tenuistipitata), 0.07% (thin fragrant plant mentioned in ancient texts) carries out the acidifying second time, brightens fragrant plant mentioned in ancient texts, the following treatment time of normal temperature is 5 minutes, though oxalic acid is big not as good as hydrochloric acid to the influence of product gel-strength as weak acid, but also should not improve concentration for excessive pursuit product whiteness, the oxalic acid solution change in concentration is influential to rate of gum output equally.
3, aftertreatment: the fragrant plant mentioned in ancient texts water after the bleaching washes, is dipped to neutrality, 20-25 times (Gracilaria tenuistipitata) or 15-20 times of (thin fragrant plant mentioned in ancient texts) water yield by the fragrant plant mentioned in ancient texts dry weight, drop into fragrant plant mentioned in ancient texts during with the water ebuillition of heated and carry glue, carry 30-40 minute glue time, look particular case and decide.Product is made powdery or strip.
Carry out concrete test with Gracilaria tenuistipitata and thin fragrant plant mentioned in ancient texts respectively below.
Embodiment 1
Test with Gracilaria tenuistipitata:
(1) alkaline purification
Gracilaria tenuistipitata 28%NaOH concentration solution-treated, treatment temp is 65 ℃, 16 hours, water flushing after the alkaline purification, immersion Gracilaria tenuistipitata were to neutral;
(2) bleaching
A, acidifying: preparation contains 0.24%HCI concentration solution Gracilaria tenuistipitata is carried out acidifying, under the normal temperature, and 5 minutes time;
B, cleaning: in time drain acidizing fluid after the acidifying, water flushing 1-2 time adds water then and treats next step processing in right amount;
C, sodium hypochlorite bleaching: acidifying, cleaned Gracilaria tenuistipitata place the chlorine bleach liquor of 0.07% available chlorine to bleach, and bleaching time is 10 minutes under the normal temperature, drain sodium hypochlorite bleaching liquid, add water to original volume;
The acidifying once more of d, oxalic acid solution, brighten: add 5% oxalic acid solution, preparation acidizing fluid concentration is 0.05%H
2C
2O
2, Gracilaria tenuistipitata is carried out the acidifying second time, brightens, 5 minutes following treatment times of normal temperature;
(3) aftertreatment
Gracilaria tenuistipitata water after the bleaching washes, is dipped to neutrality, presses 20 times of water yields of Gracilaria tenuistipitata dry weight, drops into Gracilaria tenuistipitata during with the water ebuillition of heated and carries glue, carries 35 minutes glue time.
Embodiment 2
Test with thin fragrant plant mentioned in ancient texts:
(1) alkaline purification
Thin fragrant plant mentioned in ancient texts is used 20%NaOH concentration solution-treated, and treatment temp is 65 ℃, and 16 hours, water flushing after the alkaline purification, the thin fragrant plant mentioned in ancient texts of immersion were to neutral;
(2) bleaching
A, acidifying: preparation contains 0.35%HCI concentration solution thin fragrant plant mentioned in ancient texts is carried out acidifying, under the normal temperature, and 5 minutes time;
B, cleaning: in time drain acidizing fluid after the acidifying, water flushing 1-2 time adds water then and treats next step processing in right amount;
C, sodium hypochlorite bleaching: acidifying, cleaned thin fragrant plant mentioned in ancient texts place the chlorine bleach liquor of 0.10% available chlorine to bleach, and bleaching time is 10 minutes under the normal temperature, drains sodium hypochlorite bleaching liquid, adds water to original volume;
The acidifying once more of d, oxalic acid solution, brighten: add 5% oxalic acid solution, preparation acidizing fluid concentration is 0.07%H
2C
2O
2, thin fragrant plant mentioned in ancient texts is carried out the acidifying second time, brightens, 5 minutes following treatment times of normal temperature;
(3) aftertreatment
Thin fragrant plant mentioned in ancient texts water after the bleaching washes, is dipped to neutrality, by 18 times of water yields of thin fragrant plant mentioned in ancient texts dry weight, drops into fragrant plant mentioned in ancient texts during with the water ebuillition of heated and carries glue, carries 35 minutes glue time.
Made the strip product in freezing 12-36 hour through-18 ℃.Make powder-like product through squeezing, pulverizing 60-200 order.The most outstanding effect of the present invention is that the amount of chlorine of generation is considerably less in the process with the sodium hypochlorite bleaching fragrant plant mentioned in ancient texts, and chlorine gas concentration has than big-difference when not stirring though stir, and all reaches safety standards (Chinese MAC 1mg/m
3) requirement.Quality product also is greatly improved simultaneously.
Because every batch of fragrant plant mentioned in ancient texts quality difference, rate of gum output, gel-strength, product colour have certain difference under the Same Way, and processing condition also should be adjusted accordingly.
Claims (4)
1, a kind of method that reduces chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite is characterized in that comprising following processing step:
(1) alkaline purification
Fragrant plant mentioned in ancient texts is used 20-30%NaOH concentration solution-treated, and treatment temp is 60～70 ℃, and 16 hours, water flushing after the alkaline purification, immersion fragrant plant mentioned in ancient texts were to neutral;
(2) bleaching
A, acidifying: preparation contains 0.24-0.35%HCI concentration solution fragrant plant mentioned in ancient texts is carried out acidifying, under the normal temperature, and 5 minutes time;
B, cleaning: in time drain acidizing fluid after the acidifying, water heavily is 1-2 time, adds water then and treats next step processing in right amount;
C, sodium hypochlorite bleaching: acidifying, cleaned fragrant plant mentioned in ancient texts place the chlorine bleach liquor of chloride 0.07-0.10% to bleach, and bleaching time is 10 minutes under the normal temperature, drain sodium hypochlorite bleaching liquid, add water to original volume;
The acidifying once more of d, oxalic acid solution, brighten: add the acidizing fluid that is mixed with by 5% oxalic acid solution, concentration is 0.04-0.07%H
2C
2O
4, fragrant plant mentioned in ancient texts is carried out the acidifying second time, brightens, 5 minutes following treatment times of normal temperature;
(3) aftertreatment
The flushing of fragrant plant mentioned in ancient texts water after the bleaching, be dipped to neutrality,, drop into fragrant plant mentioned in ancient texts during with the water ebuillition of heated and carry glue, carry 30-40 minute glue time, made the strip product in freezing 12-36 hour through-18 ℃ by the 15-25 times of water yield of fragrant plant mentioned in ancient texts dry weight.
2, according to the method for the described minimizing chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite of claim 1, it is characterized in that through squeezing, pulverize the 60-200 order and make powder-like product.
3,, it is characterized in that carrying out with Gracilaria tenuistipitata according to the method for the described minimizing chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite of claim 1;
(1) alkaline purification
Gracilaria tenuistipitata 28%NaOH concentration solution-treated, treatment temp is 65 ℃, 16 hours, water flushing after the alkaline purification, immersion Gracilaria tenuistipitata were to neutral;
(2) bleaching
A, acidifying: preparation contains 0.24%HCI concentration solution Gracilaria tenuistipitata is carried out acidifying, under the normal temperature, and 5 minutes time;
B, cleaning: in time drain acidizing fluid after the acidifying, water flushing 1-2 time adds water then and treats next step processing in right amount;
C, sodium hypochlorite bleaching: acidifying, cleaned Gracilaria tenuistipitata place chloride 0.07% chlorine bleach liquor to bleach, and bleaching time is 10 minutes under the normal temperature, drain sodium hypochlorite bleaching liquid, add water to original volume;
The acidifying once more of d, oxalic acid solution, brighten: add 5% oxalic acid solution, preparation acidizing fluid concentration is 0.05%H
2C
2O
4, Gracilaria tenuistipitata is carried out the acidifying second time, brightens, 5 minutes following treatment times of normal temperature;
(3) aftertreatment
Gracilaria tenuistipitata water after the bleaching washes, is dipped to neutrality, presses 20 times of water yields of Gracilaria tenuistipitata dry weight, drops into Gracilaria tenuistipitata during with the water ebuillition of heated and carries glue, carries 35 minutes glue time.
4,, it is characterized in that carrying out with thin fragrant plant mentioned in ancient texts according to the method for the described minimizing chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite of claim 1;
(1) alkaline purification
Thin fragrant plant mentioned in ancient texts is used 20%NaOH concentration solution-treated, and treatment temp is 65 ℃, and 16 hours, water flushing after the alkaline purification, the thin fragrant plant mentioned in ancient texts of immersion were to neutral;
(2) bleaching
A, acidifying: preparation contains 0.35%HCI concentration solution thin fragrant plant mentioned in ancient texts is carried out acidifying, under the normal temperature, and 5 minutes time;
B, cleaning: in time drain acidizing fluid after the acidifying, water flushing 1-2 time adds water then and treats next step processing in right amount;
C, sodium hypochlorite bleaching: acidifying, cleaned thin fragrant plant mentioned in ancient texts place chloride 0.10% chlorine bleach liquor to bleach, and bleaching time is 10 minutes under the normal temperature, drains sodium hypochlorite bleaching liquid, adds water to original volume;
The acidifying once more of d, oxalic acid solution, brighten: add 5% oxalic acid solution, preparation acidizing fluid concentration is 0.07%H
2C
2O
4, thin fragrant plant mentioned in ancient texts is carried out the acidifying second time, brightens, 5 minutes following treatment times of normal temperature;
(3) aftertreatment
Thin fragrant plant mentioned in ancient texts water after the bleaching washes, is dipped to neutrality, and 18 times of water yields by thin fragrant plant mentioned in ancient texts dry weight drop into thin fragrant plant mentioned in ancient texts during with the water ebuillition of heated and carry glue, carry 35 minutes glue time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021153035A CN1161384C (en) | 2002-05-27 | 2002-05-27 | Method for effectively reducing chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021153035A CN1161384C (en) | 2002-05-27 | 2002-05-27 | Method for effectively reducing chlorine gas produced while bleaching gracilaria verrucosa with sodium hypochlorite |
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| Publication Number | Publication Date |
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| CN1408730A CN1408730A (en) | 2003-04-09 |
| CN1161384C true CN1161384C (en) | 2004-08-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101828696A (en) * | 2010-05-19 | 2010-09-15 | 华侨大学 | Production process for preparing high-activity compound dietary fibers by extracting from Gracilaria |
| CN101199337B (en) * | 2007-10-22 | 2011-06-08 | 广东海洋大学 | Quick cleaning equipment and method of gracilaria gigas harvey sodium hypochlorite solution |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100338098C (en) * | 2005-11-29 | 2007-09-19 | 广东海洋大学 | Water-saving method when processing Gracilaria to produce agar |
| CN112430276A (en) * | 2021-01-13 | 2021-03-02 | 青岛聚大洋藻业集团有限公司 | Method for extracting agar from fresh asparagus |
-
2002
- 2002-05-27 CN CNB021153035A patent/CN1161384C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101199337B (en) * | 2007-10-22 | 2011-06-08 | 广东海洋大学 | Quick cleaning equipment and method of gracilaria gigas harvey sodium hypochlorite solution |
| CN101828696A (en) * | 2010-05-19 | 2010-09-15 | 华侨大学 | Production process for preparing high-activity compound dietary fibers by extracting from Gracilaria |
| CN101828696B (en) * | 2010-05-19 | 2012-11-21 | 华侨大学 | Production process for preparing high-activity compound dietary fibers by extracting from Gracilaria |
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| CN1408730A (en) | 2003-04-09 |
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