CN110922301B

CN110922301B - Method for extracting sugar alcohol from chewing gum waste

Info

Publication number: CN110922301B
Application number: CN201911135449.8A
Authority: CN
Inventors: 曲廷云; 孙鲁; 沈丽丽; 董丽红; 刘海朋; 杜瑞锋
Original assignee: Shandong Futaste Pharmaceutical Co ltd
Current assignee: Shandong Futaste Pharmaceutical Co ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2021-12-17
Anticipated expiration: 2039-11-19
Also published as: CN110922301A

Abstract

The invention belongs to the technical field of functional sugar, and relates to a method for extracting sugar alcohol from chewing gum waste. The invention provides a method for extracting sugar alcohol from chewing gum waste, which comprises the following steps: (1) taking a chewing gum waste sample, and detecting the types of sugar alcohols in the sample; (2) dissolving the filter aid by using pure water; (3) dissolving the chewing gum waste with pure water; (4) adding the filter aid solution into the waste material solution, stirring uniformly and standing; (5) filtering the mixed solution; (6) adding active carbon into the filtrate, and keeping the temperature; (7) filtering the feed liquid by a plate frame, carrying out ion exchange, carrying out evaporation concentration, then crystallizing, and selecting gradient cooling or melting mode according to the types of sugar alcohols during crystallization. The invention adopts soluble macromolecular substance as filter aid, accelerates the membrane filtration speed, reduces the membrane blockage degree, and has the yield of sugar alcohol crystal relative to waste material of 40-60 percent and the purity of sugar alcohol crystal more than or equal to 95 percent.

Description

Method for extracting sugar alcohol from chewing gum waste

Technical Field

The invention belongs to the technical field of functional sugar, and relates to a method for extracting sugar alcohol from chewing gum waste.

Background

The chewing gum is prepared by taking natural gum or glycerol resin as a colloid base, adding syrup, mint, a sweetening agent and the like, and blending and pressing the mixture to obtain the chewing gum for people to chew in the mouth. Is a kind of sugar which is very popular among people in the world. Can be eaten and played, and is popular with children and young people. Meanwhile, the utility model is a cool and fashionable new favorite for most young people. While improving oral health, the facial muscle movements brought by chewing gum also have multiple effects in the field of cognition.

At present, the mainstream chewing gum in the market is generally added with sugar alcohol substances such as xylitol, maltitol, sorbitol and the like as a sweetening agent to play a role in preventing decayed teeth. In the process of producing the chewing gum, powder waste containing the sugar alcohol substances is generated, sugar alcohol in the waste is often single sugar alcohol, the sugar alcohol content in the waste can reach more than 85 percent, and in addition, impurities such as gums, essences, pigments and the like are also generated. Because the waste material contains a large amount of glue substances, the situations of low filtering speed, membrane hole blockage and the like can occur when quality removing means such as filtering and the like are adopted, the effect of adding common filter aids such as diatomite and the like which play a role in assisting in filtering through a physical mode is not obvious during filtering, and the difficulty and the cost for extracting sugar alcohol substances by utilizing the waste material are high. At present, the sugar alcohol is mostly added into fertilizers and feeds for utilization, the added value of products is low, and a large amount of sugar alcohol in waste materials is not fully utilized, so that the resource waste is caused.

Therefore, it is necessary to invent a method for extracting sugar alcohol from chewing gum waste by fully utilizing the sugar alcohol in view of the above-mentioned resource waste phenomenon caused by insufficient utilization of sugar alcohol in chewing gum waste.

Disclosure of Invention

In order to solve the technical problems, the invention provides a method for extracting sugar alcohol from chewing gum waste, which aims to solve the problems of high extraction difficulty, high extraction cost, low waste utilization added value and the like in the prior art and fully utilize resources.

The scheme for solving the technical problems is mainly to add filter-aid substances to promote membrane filtration, carbon adsorption, ion exchange and other methods to remove impurities in the waste materials, and then to obtain sugar alcohol crystals through evaporation, concentration, crystallization and other processes.

A process for extracting sugar alcohols from chewing gum waste comprising the steps of:

(1) taking a chewing gum waste sample, and detecting the types of sugar alcohols in the sample by a liquid chromatography method;

(2) dissolving the filter aid by using pure water to obtain a filter aid solution;

(3) dissolving the chewing gum waste by using pure water to obtain a waste solution;

(4) adding the filter aid solution in the step (2) into the waste material solution in the step (3), uniformly stirring and standing;

(5) filtering the mixed solution in the step (4);

(6) adding active carbon into the filtrate obtained in the step (5), and preserving heat;

(7) and (4) filtering the feed liquid obtained in the step (6) by using a plate frame, performing ion exchange, evaporating, concentrating and crystallizing.

(1) In the above, the sugar alcohol type contained in the chewing gum waste is any of xylitol, maltitol, sorbitol, erythritol, lactitol, and isomalt, and the above is merely preferred but not limited to the above.

Preferably, in (2), the filter aid is selected from any one of sodium carboxymethylcellulose, gelatin and microcrystalline cellulose; after dissolution, the mass concentration of the filter aid solution is 1-5%.

(3) The concentration of the waste solution in the process is 10-30%;

(4) the dosage of the medium filter aid solution is 0.1-2% of the total weight of the waste material solution;

(5) the mixed solution in the step (1) is filtered by a membrane, and the filtering speed is 50-100L/min under the same condition and is more than 4 times of that without the filter aid;

(6) and keeping the temperature at 20-80 ℃ for 20-100 min. The selection of the heat preservation temperature is related to the membrane filtration precision, the lower the filtration precision is, the larger the pore diameter of the membrane core is, the lower the required heat preservation temperature is, the longer the heat preservation time is, the higher the filtration precision is, the smaller the pore diameter of the membrane core is, the higher the required heat preservation temperature is, and the shorter the heat preservation time is; the range limited by the invention is a better range of heat preservation temperature and heat preservation time in the production process;

preferably, the method for extracting sugar alcohol from chewing gum waste comprises the following steps:

(2) dissolving a filter aid by using pure water to obtain a filter aid solution with the mass concentration of 1-5%;

(3) dissolving the chewing gum waste by using pure water to obtain a waste solution; the concentration of the waste solution is 10-30%;

(4) adding the filter aid solution in the step (2) into the waste material solution in the step (3), uniformly stirring, and standing for 30-60 min; the using amount of the filter aid solution is 0.1-2% of the total weight of the waste material solution;

(5) filtering the mixed solution in the step (4) by using membrane equipment with the filtering precision of 500-3000 Da, wherein the filtering speed is 50-100L/min;

(6) adding active carbon with the dry matter content of 0.5-2% into the filtrate obtained in the step (5), and preserving the heat for 30-120 min at the temperature of 30-70 ℃;

(7) and (4) filtering the feed liquid obtained in the step (6) by using a plate frame, performing ion exchange, evaporating and concentrating, and then crystallizing, wherein a gradient cooling mode or a melting mode is selected according to the types of sugar alcohols during crystallization.

The crystallization mode is different due to different types of sugar alcohols, the types of the sugar alcohols are xylitol, maltitol, erythritol and chewing gum waste of lactitol, and the crystallization mode is cooling;

the sugar alcohol is sorbitol or isomalt, and the crystallization mode is melting.

The yield of the sugar alcohol relative to the waste material is 40-60%, and the purity of the sugar alcohol crystal is more than or equal to 95%.

When the inventor of the invention improves the invention, the sugar alcohol in the waste material of the chewing gum is often single sugar alcohol through analysis from special components of the chewing gum, the content of the sugar alcohol substances in the waste material reaches about 85%, and the substances are colloid, essence, pigment and the like.

In addition, the inventor adds various filter aids to accelerate the filtration speed through experiments, and finds that the effect is still not obvious, and sugar alcohol substances in the waste materials are difficult to extract. Based on the difficulties, the inventor adopts soluble macromolecular substances as a filter aid by analyzing the characteristics of waste materials in chewing gum so as to increase the speed of membrane filtration and obviously reduce the phenomenon of membrane blockage.

The invention has the beneficial effects that:

(1) the invention adopts soluble macromolecular substances as the filter aid, accelerates the membrane filtration speed, reduces the membrane blockage degree, and removes macromolecular impurities in the chewing gum waste solution through membrane filtration; selecting different decolorizing temperatures and decolorizing times according to different membrane filtration precisions, removing impurities such as pigment, ions and the like in the solution through plate-frame filtration and ion exchange, and then obtaining sugar alcohol crystals through evaporation, concentration and crystallization;

(2) the invention adopts a small amount of macromolecular substances as the filter aid, saves the cost, obviously improves the filter speed by more than 4 times due to the filter aid effect, and reduces the difficulty of subsequent membrane cleaning.

(3) By adopting the process, the product sugar alcohol is obtained from the chewing gum waste sample, the added value of the waste is improved, the resources are fully utilized, and the waste is changed into valuable.

Detailed Description

The present invention is further illustrated by the following specific examples, but the present invention is not limited thereto.

Example 1A

(1) taking a chewing gum waste sample, and detecting the sample by a liquid chromatography method, wherein sugar alcohol in the chewing gum is xylitol;

(2) dissolving sodium carboxymethylcellulose in pure water to prepare a solution with the mass concentration of 1%;

(3) dissolving the chewing gum waste by pure water to prepare a waste solution with the mass concentration of 10%;

(4) adding sodium carboxymethylcellulose solution into the waste solution at a ratio of 0.1% of the total weight of the waste solution, stirring uniformly, and standing for 30 min;

(5) filtering the mixed solution by a device with the filtering precision of 500 Da;

(6) adding activated carbon with a dry matter weight ratio of 0.5% into the membrane filtrate, and keeping the temperature at 70 deg.C for 30 min;

(7) and (3) performing plate-frame filtration, ion exchange and evaporation concentration on the heat-preserved feed liquid, and performing gradient cooling crystallization to obtain xylitol crystals, wherein the purity of the crystals is 99.5%, and the crystallization yield is 52.5%.

Example 1B

The difference from example 1A is that in this example, the filter aid is replaced with the same amount of gelatin; the rest is the same as in example 1A. The purity of the crystal is 99.3 percent and the crystallization yield is 52.1 percent.

Example 1C

The difference from example 1A is that in this example the filter aid is replaced by the same amount of microcrystalline cellulose; the rest is the same as in example 1A. The purity of the crystal is 99.2 percent and the crystallization yield is 52.6 percent.

As can be seen from examples 1B and 1C, when the kind of the filter aid was changed, the crystal purity and the crystallization yield of the product were not substantially affected.

Example 2

(1) taking a chewing gum waste sample, and detecting that sugar alcohol in the sample is maltitol by a liquid chromatography method;

(2) dissolving gelatin with pure water to prepare a solution with the mass concentration of 3%;

(3) dissolving the chewing gum waste by pure water to prepare a waste solution with the mass concentration of 20%;

(4) adding the gelatin solution into the waste solution according to the proportion of 1 percent of the total weight of the waste solution, uniformly stirring and standing for 45 minutes;

(5) filtering the mixed solution by equipment with the filtering precision of 1500 Da;

(6) adding activated carbon with a dry matter weight ratio of 1% into the membrane filtrate, and keeping the temperature at 50 ℃ for 80 min;

(7) and (3) filtering the heat-preserved feed liquid by using a plate frame, performing ion exchange, evaporating and concentrating, and performing gradient cooling crystallization to obtain a maltitol crystal, wherein the purity of the crystal is 98.9%, and the crystallization yield is 55%.

Example 3

(1) taking a chewing gum waste sample, and detecting by a liquid chromatography method to find that sugar alcohol in the sample is sorbitol;

(2) dissolving microcrystalline cellulose with pure water to prepare a solution with the mass concentration of 5%;

(3) dissolving the chewing gum waste by pure water to prepare a waste solution with the mass concentration of 30 percent;

(4) adding the microcrystalline cellulose solution into the waste solution according to the proportion of 2 percent of the total weight of the waste solution, uniformly stirring and standing for 60 minutes;

(5) filtering the mixed solution by a device with the filtering precision of 3000 Da;

(6) adding activated carbon with a dry matter weight ratio of 2% into the membrane filtrate, and keeping the temperature at 30 ℃ for 120 min;

(7) and (3) carrying out plate-and-frame filtration, ion exchange and evaporation concentration on the heat-preserved feed liquid, and then carrying out melt crystallization to obtain the sorbitol crystal, wherein the crystal purity is 98.5%, and the crystal yield is 57.5%.

Comparative example 1

The difference from the example 1A is that the filtration is carried out without adding a filter aid, and the method is the same as the example 1A, and specifically comprises the following steps:

(2) dissolving the chewing gum waste with pure water to prepare a waste solution with the mass concentration of 10%, and uniformly stirring and standing for 30 min;

(3) filtering the solution in the step (2) by a device with the filtering precision of 500 Da; (the inventors found that the filtration time was much longer than that in example 1)

(4) Adding activated carbon with a dry matter weight ratio of 0.5% into the membrane filtrate, and keeping the temperature at 70 deg.C for 30 min;

(7) and (3) performing plate-frame filtration, ion exchange and evaporation concentration on the heat-preserved feed liquid, and performing gradient cooling crystallization to obtain xylitol crystals, wherein the purity of the crystals is 65.3 percent, and the crystallization yield is 24.5 percent.

As can be seen from comparative example 1A, the product obtained without adding a filter aid had a crystal purity far lower than that of example 1A and a crystal yield far lower than that of example 1A. This demonstrates that the soluble macromolecular substance filter aid used in the present invention helps to increase the filtration rate and reduce the degree of membrane clogging.

Comparative example 2

The difference from the example 1A is that (6) is not added with activated carbon, and the rest is the same as the example 1A, and the method specifically comprises the following steps:

(6) keeping the temperature of the membrane filtrate at 70 ℃ for 30 min;

(7) and (3) performing plate-frame filtration, ion exchange and evaporation concentration on the heat-preserved feed liquid, and performing gradient cooling crystallization to obtain xylitol crystals, wherein the purity of the crystals is 71.3 percent, and the crystallization yield is 34.5 percent.

TABLE 1 comparison of the characteristics of the products of the examples with those of comparative examples 1 to 2

	Crystal purity (%)	Crystallization yield (%)	Filtration rate (L/min)	Difference in
					Example 1A	99.5	52.5	75	/
Example 1B	99.3	52.1	83	/
					Example 1C	99.2	52.6	72	/
Example 2	98.9	55	80	/
					Example 3	98.5	57.5	76	/
Comparative example 1	65.3	24.5	16	Without using filter aids
					Comparative example 2	71.3	34.5	77	Without adding activated carbon

As can be seen from the above table and comparative example 2, the crystal purity and the crystal yield of the obtained product were lower than those of example 1A of the present invention; the invention accelerates the membrane filtration speed by adding the filter aid, reduces the membrane blockage degree, removes macromolecular impurities in the chewing gum waste solution by membrane filtration, and then adopts the activated carbon to further adsorb the impurities in the product, thereby improving the purity of the crystal.

Comparative examples 3 to 7

The difference from example 1A is that the types of filter aids used in comparative examples 3 to 7 are different from example 1A and the amounts are the same, and the rest are the same as example 1A, and the specific filter aids used and the crystal purities and yields of the obtained products are shown in Table 2 below:

TABLE 2 comparison of the filter aids and product characteristics of the examples with those of comparative examples 3 to 7

As can be seen from the data in the above table, the same filter aids are used, but not all filter aids can significantly increase the filtration rate and reduce the clogging phenomenon of membrane filtration, and the above-mentioned point can be deduced from the purity and yield of the product. Therefore, the invention selects macromolecule soluble substance as the filter aid in a plurality of filter aids, achieves unexpected effect, and can successfully extract sugar alcohol in the waste material of chewing gum, which is a great innovation and progress in the field.

Claims

1. A process for extracting sugar alcohols from chewing gum waste comprising the steps of:

(5) filtering the mixed solution in the step (4);

(7) filtering the feed liquid obtained in the step (6) by a plate frame, carrying out ion exchange, evaporating and concentrating, and crystallizing;

in the step (2), the filter aid is selected from any one of sodium carboxymethylcellulose, gelatin and microcrystalline cellulose; after dissolution, the mass concentration of the filter aid solution is 1-5%.

2. The method for extracting sugar alcohol from chewing gum waste according to claim 1, wherein in step (1), the sugar alcohol contained in the chewing gum waste is any one of xylitol, maltitol, sorbitol, erythritol, lactitol and isomalt.

3. The process for extracting sugar alcohol from chewing gum waste as claimed in claim 1, wherein the concentration of the waste solution in step (3) is 10-30%.

4. The process for extracting sugar alcohols from chewing gum waste according to claim 1 wherein the amount of filter aid solution used in step (4) is 0.1 to 2% by weight of the total waste solution.

5. The method for extracting sugar alcohol from chewing gum waste as claimed in claim 1, wherein the mixed solution in step (5) is filtered by membrane at a filtering speed of 50-100L/min.

6. The method for extracting sugar alcohol from chewing gum waste as claimed in claim 1, wherein in step (6), the temperature is maintained at 20-80 ℃ for 20-100 min.

7. A process of extracting sugar alcohols from chewing gum waste as claimed in claim 1, comprising the steps of:

8. A process for extracting sugar alcohols from chewing gum waste as claimed in claim 1, wherein:

the sugar alcohol is xylitol, maltitol, erythritol, lactitol, and the crystallization mode is cooling;

9. The method of claim 1, wherein the yield of sugar alcohol from the waste material is 40-60% and the crystal purity of sugar alcohol is 95% or more.