CN102504035A - Method for increasing substitution degree of hydroxypropul starch - Google Patents
Method for increasing substitution degree of hydroxypropul starch Download PDFInfo
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- CN102504035A CN102504035A CN2011103406460A CN201110340646A CN102504035A CN 102504035 A CN102504035 A CN 102504035A CN 2011103406460 A CN2011103406460 A CN 2011103406460A CN 201110340646 A CN201110340646 A CN 201110340646A CN 102504035 A CN102504035 A CN 102504035A
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Abstract
The invention relates to a method for increasing the substitution degree of hydroxypropul starch. The method comprises the following steps of: (1), cooling a starch emulsion body in a reaction tank to be below 30 DEG C, adding 27.5 g of a sodium hydroxide solution with the concentration of 4% into 250 g of the starch emulsion body with the concentration of 40%, and stirring at 15-28 DEG C for 0.5-1 h; (2), adding 10 g of an epoxy propane solution with the concentration of 99% into the solution obtained in the step (1), and stirring at 15-28 DEG C for 0.5-1 h; (3), beginning to keep the temperature after heating the solution obtained in the step (2) to 45-50 DEG C, and keeping the temperature for 10-24 h; and (4), adding 1-3 g of a hydrochloric acid solution with the concentration of 5% into the solution obtained in the step (3), stirring and uniformly mixing while dropping the 5% hydrochloric acid solution, detecting a PH value simultaneously, and stopping dropping the 5% hydrochloric acid solution while adjusting the PH value to be 6-7. The method disclosed by the invention has the benefits of being capable of increasing the utilization rate of epoxypropane, increasing the product substitution degree, reducing pollution, reducing the production cost and greatly reducing environmental pollution.
Description
Technical field
The invention discloses the method that the kind in a kind of field of fine chemical improves the hydroxypropylated starch substitution value.
Background technology
The medicine utilization ratio is low in the hydroxypropylated starch production process at present, causes substitution value low, produces waste seriously, and pollution on the environment is more serious.
Summary of the invention
The purpose of this invention is to provide a kind of method that the hydroxypropylated starch substitution value is improved.Solution of the present invention is; It is characterized in that this method may further comprise the steps: one, the starch emulsion temperature is cooled to below 30 ℃ in the retort; In 250g concentration is that to add concentration in 40% the milk of starch liquid be 4% sodium hydroxide solution 27.5g, stirs 0.5-1 hour 15-28 ℃ of temperature; Two, adding concentration is 99% propylene oxide liquid 10g in the solution that in above-mentioned first step, obtains, and stirs 0.5-1 hour 15-28 ℃ of temperature; Three, get solution that second step obtains and be heated to 45-50 ℃ and begin insulation, kept this temperature 10-24 hour; Four, in the solution that third step obtains, adding concentration is 5% hydrochloric acid solution 1-3g, when splashing into 5% hydrochloric acid solution, carries out stirring and evenly mixing, and detects pH value simultaneously, stops to splash into 5% hydrochloric acid solution between 6-7 the time when regulating pH value.
The invention has the beneficial effects as follows that the present invention can improve the utilization ratio of propylene oxide, increase the product substitution value, reduce and pollute.Both reduced production cost, can reduce pollution greatly again environment.
Embodiment
The starch emulsion temperature is cooled to below 30 ℃ in embodiment 1:, the retort, is that to add concentration in 40% the milk of starch liquid be 4% sodium hydroxide solution 27.5g in 250g concentration, stirs 0.5 hour 20 ℃ of temperature; Two, adding concentration is 99% propylene oxide liquid 10g in the solution that in above-mentioned first step, obtains, and stirs 0.5 hour 20 ℃ of temperature; Three, get solution that second step obtains and be heated to 48 ℃ and begin insulation, kept this temperature 18 hours; Four, in the solution that third step obtains, adding concentration is 5% hydrochloric acid solution 1-3g, when splashing into 5% hydrochloric acid solution, carries out stirring and evenly mixing, and detects pH value simultaneously, when regulating pH value to 6.5, stops to splash into 5% hydrochloric acid solution.Aforesaid method can obtain the hydroxypropylated starch of high substitution value.
Embodiment 2; Increase the consumption of each raw material according to embodiment 1 multiple: one, the starch emulsion temperature is cooled to below 30 ℃ in the retort; In 500g concentration is that to add concentration in 40% the milk of starch liquid be 4% sodium hydroxide solution 55g, stirs 1 hour 28 ℃ of temperature; Two, adding concentration is 99% propylene oxide liquid 20g in the solution that in above-mentioned first step, obtains, and stirs 1 hour 28 ℃ of temperature; Three, get solution that second step obtains and be heated to 50 ℃ and begin insulation, kept this temperature 22 hours; Four, in the solution that third step obtains, adding concentration is 5% hydrochloric acid solution 2-6g, when splashing into 5% hydrochloric acid solution, carries out stirring and evenly mixing, and detects pH value simultaneously, when regulating pH value to 6.8, stops to splash into 5% hydrochloric acid solution.Aforesaid method can obtain the hydroxypropylated starch of high substitution value.
Embodiment recited above describes preferred implementation of the present invention; Be not that design of the present invention and scope are limited; Under the prerequisite that does not break away from design concept of the present invention, the various improvement that those skilled in the art make technical scheme of the present invention all should fall into protection scope of the present invention; The technology contents that the present invention asks for protection all is documented in claims.
Claims (1)
1. method that the hydroxypropylated starch substitution value is improved; It is characterized in that this method may further comprise the steps: one, the starch emulsion temperature is cooled to below 30 ℃ in the retort; In 250g concentration is that to add concentration in 40% the milk of starch liquid be 4% sodium hydroxide solution 27.5g, stirs 0.5-1 hour 15-28 ℃ of temperature; Two, adding concentration is 99% propylene oxide liquid 10g in the solution that in above-mentioned first step, obtains, and stirs 0.5-1 hour 15-28 ℃ of temperature; Three, get solution that second step obtains and be heated to 45-50 ℃ and begin insulation, kept this temperature 10-24 hour; Four, in the solution that third step obtains, adding concentration is 5% hydrochloric acid solution 1-3g, when splashing into 5% hydrochloric acid solution, carries out stirring and evenly mixing, and detects pH value simultaneously, stops to splash into 5% hydrochloric acid solution between 6-7 the time when regulating pH value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103406460A CN102504035A (en) | 2011-11-02 | 2011-11-02 | Method for increasing substitution degree of hydroxypropul starch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103406460A CN102504035A (en) | 2011-11-02 | 2011-11-02 | Method for increasing substitution degree of hydroxypropul starch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102504035A true CN102504035A (en) | 2012-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103406460A Pending CN102504035A (en) | 2011-11-02 | 2011-11-02 | Method for increasing substitution degree of hydroxypropul starch |
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| Country | Link |
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| CN (1) | CN102504035A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103509127A (en) * | 2012-06-30 | 2014-01-15 | 山东光大科技发展有限公司 | Slurry method production process of low-bath-ratio high-substituted hydroxypropyl starch ether |
| CN104072625A (en) * | 2013-03-26 | 2014-10-01 | 渔淮 | Novel preparation process for hydroxypropyl modified starch used for food |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717451A (en) * | 2009-12-18 | 2010-06-02 | 张雷达 | Method for enhancing substitution degree of hydroxypropyl starch |
| CN101747445A (en) * | 2008-12-15 | 2010-06-23 | 天津科技大学 | Method for preparing hydroxypropul starch under ultrasound and microwave synergistic effect |
-
2011
- 2011-11-02 CN CN2011103406460A patent/CN102504035A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747445A (en) * | 2008-12-15 | 2010-06-23 | 天津科技大学 | Method for preparing hydroxypropul starch under ultrasound and microwave synergistic effect |
| CN101717451A (en) * | 2009-12-18 | 2010-06-02 | 张雷达 | Method for enhancing substitution degree of hydroxypropyl starch |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103509127A (en) * | 2012-06-30 | 2014-01-15 | 山东光大科技发展有限公司 | Slurry method production process of low-bath-ratio high-substituted hydroxypropyl starch ether |
| CN104072625A (en) * | 2013-03-26 | 2014-10-01 | 渔淮 | Novel preparation process for hydroxypropyl modified starch used for food |
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Application publication date: 20120620 |