Method for completely recycling waste bamboo shoot shell brown pigment, dietary fiber and sodium carboxymethyl cellulose
By extracting brown pigments from discarded bamboo shoot shells and preparing dietary fiber and sodium carboxymethylcellulose, the problem of resource utilization of discarded bamboo shoot shells is solved, green and energy-saving product preparation is achieved, and the safety and scope of use of the product are improved.
Patent Information
- Application Number
- CN202510216598.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2025-05-30
AI Technical Summary
The existing technology has failed to achieve the full resource utilization of discarded bamboo shoot shells, and the extraction process consumes a lot of energy, and there is a risk of sulfur residue. The product preparation method is not green and there is a great safety hazard.
By mixing the discarded bamboo shoot shell powder with sodium hydroxide solution, extracting brown pigments under micro boiling conditions, and directly filtration does not require adjustment of pH. Dietary fiber and sodium carboxymethylcellulose are prepared using filter residue, and carboxymethylation is carried out using green methods such as citric acid regulation and sulfur-free process.
The complete resource utilization of discarded bamboo shoot shells has been achieved, energy consumption is reduced, sulfur residue is avoided, the product preparation method is green, energy-saving, high safety, and a wide range of use.
Smart Images
Figure CN120059490A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of resource recycling, and specifically to a complete resource utilization preparation method for waste bamboo shoot shell brown pigment, dietary fiber and sodium carboxymethylcellulose. Background Art
[0002] The "complete resource utilization preparation method for waste bamboo shoot shell brown pigment, dietary fiber and sodium carboxymethylcellulose" mainly consists of three core parts: extraction of brown pigment, preparation of dietary fiber, and preparation of sodium carboxymethylcellulose. First, through pretreatment and decomposition of waste bamboo shoot shells, the brown pigment therein is extracted and further separated by appropriate chemical or physical methods. Next, the filter residue after extracting the brown pigment is used for the preparation of dietary fiber, and usually the acid-base hydrolysis method or enzymatic hydrolysis method is adopted to improve the extraction efficiency of the fiber. After the dietary fiber is adjusted by a green method, a high-value material that can be safely used in the fields of food, medicine, cosmetics, etc. is obtained. The principle of this preparation method lies in the complete resource utilization of waste resources. Through a series of chemical modifications and physical processing, it is converted into available high-value products to achieve the maximum utilization of resources.
[0003] In the current existing technologies, either only the brown pigment is extracted singly without considering how to utilize the filter residue, or only the cellulose is extracted and utilized, and the utilization of the brown pigment is not considered during the extraction process. During the extraction of the pigment, the pH value needs to be adjusted and dried to prepare a powder, consuming a large amount of energy. In the preparation of dietary fiber, bleaching is required, and there is a risk of sulfur residue. Therefore, the complete resource utilization of bamboo shoot shells cannot be achieved in the existing technologies, and the product preparation method is not green, with potential safety hazards, restricting its use. Summary of the Invention
[0004] In view of the deficiencies of the existing technologies, the present invention provides a complete resource utilization preparation method for waste bamboo shoot shell brown pigment, dietary fiber and sodium carboxymethylcellulose, which solves the problems of complete resource utilization of waste bamboo shoot shells, energy-saving and green product preparation methods, high product safety, and wide application range.
[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A complete resource utilization preparation method for waste bamboo shoot shell brown pigment, dietary fiber and sodium carboxymethylcellulose, comprising:
[0006] a. Extraction of brown pigment: Add waste bamboo shoot shell powder to 2% sodium hydroxide solution at a solid-liquid ratio of 1:10, extract for 60 minutes under slightly boiling conditions. After extraction, the pH value of the filtrate does not need to be adjusted, and it is directly filtered, concentrated and then dried and stored. The filter residue is used for the subsequent preparation of dietary fiber and sodium carboxymethylcellulose. The concentration of the filtrate is 99.0%, and the obtained concentrated brown pigment solution is used in the fields of food and cosmetics;
[0007] b. Preparation of dietary fiber: The filter residue after extracting brown pigment was added to 4% citric acid solution according to a solid-liquid ratio of 1:10 to adjust the pH value. After adjusting to neutral, it was pressure-filtered and dried to obtain dietary fiber, and the drying loss of the dietary fiber was 2.03%.
[0008] c. Preparation of sodium carboxymethyl cellulose: The filter residue after extracting brown pigment was subjected to carboxymethylation treatment. The reaction temperature was 80 - 90 °C, and the reaction time was 60 - 120 minutes to obtain sodium carboxymethyl cellulose, and the pH value of the sodium carboxymethyl cellulose was 6.60.
[0009] d. Concentration of brown pigment: The filtrate after extraction was concentrated to remove water to obtain a concentrated brown pigment solution with a concentration reaching 99.0%, which was used as a natural pigment in the fields of food and cosmetics, and the color of the brown pigment was dark brown.
[0010] e. Green preparation of dietary fiber: The filter residue obtained after extracting pigment was adjusted with edible citric acid to achieve the purpose of green preparation, and its safety was guaranteed in the food field. The prepared dietary fiber was a sulfur-free product.
[0011] f. Filtration and separation: Dietary fiber and sodium carboxymethyl cellulose were further separated and purified through a filter screen or other separation equipment to ensure that the impurity content in the final product was low, and the moisture content of the final product was controlled at 0.71%.
[0012] g. Final drying and storage: The brown pigment, dietary fiber, and sodium carboxymethyl cellulose were dried to obtain dry powder or other forms suitable for storage and transportation, and stored in a dry environment. The water content of the dietary fiber after final drying was 2%.
[0013] h. Detection and quality control: The obtained products were subjected to quality inspection, including but not limited to pH value, water content, and impurity content, to ensure compliance with food-grade or other industry standards. The obtained dietary fiber had no sulfur residue, the viscosity of sodium carboxymethyl cellulose reached 492 mPa·s, and the degree of etherification reached above 0.54, meeting the standards for food additives and industrial use.
[0014] i. Optimization of industrial production: According to the above steps, the process parameters were optimized to ensure high-efficiency and stable production in large-scale production, and to reduce production costs. The optimized process flow could achieve the goals of a 30% increase in production efficiency, 20% energy conservation, and 15% cost reduction.
[0015] Preferably, for the extraction of the brown pigment, no pH adjustment is required, and it is directly filtered and concentrated to a paste for storage to achieve energy-saving production.
[0016] Preferably, food-grade citric acid is added during the preparation of the dietary fiber for adjustment, and there is no sulfur residue, ensuring the safety of product use.
[0017] Preferably, an amino acid catalyst is added during the carboxymethylation process, the reaction temperature is 80 °C, and the reaction time is controlled within 50 minutes.
[0018] Preferably, for the preparation of the dietary fiber, food-grade citric acid is used for adjustment, there is no sulfur residue, and the cellulose purity reaches over 99%.
[0019] Preferably, during the carboxymethylation reaction step, ammonium chloride is added as a buffer to improve the reaction uniformity and rate, ensuring the quality stability of sodium carboxymethyl cellulose. The concentration of ammonium chloride is 1%-2% (w / v).
[0020] Preferably, the dietary fiber is treated by a water washing step to further remove residual impurities, ensuring that the purity of the final product reaches over 99% and the water-soluble substances are less than 0.24%.
[0021] The present invention provides a complete resource utilization preparation method for waste bamboo shoot shell brown pigment, dietary fiber and sodium carboxymethyl cellulose. It has the following beneficial effects:
[0022] This complete resource utilization preparation method for waste bamboo shoot shell brown pigment, dietary fiber and sodium carboxymethyl cellulose solves the problem of complete resource utilization of waste bamboo shoot shells. The preparation method is green and energy-saving, the products are green and safe, and the application range is wide. It also solves the problems of high cost and high energy consumption during the preparation process of brown pigment. By optimizing the extraction process, the present invention can efficiently extract brown pigment, dietary fiber and sodium carboxymethyl cellulose from waste bamboo shoot shells. Using the process that the brown pigment does not require pH adjustment and drying, and the dietary fiber preparation uses food-grade reagents for adjustment and does not require bleaching, the purity and quality of the products are significantly improved, while achieving energy-saving and green product preparation.
[0023] The technical solution of the present invention innovatively introduces multiple improvement measures. During the extraction of brown pigment, pH adjustment is not required, and it is directly filtered and concentrated to a paste for storage. During the preparation of dietary fiber, food-grade citric acid is used for adjustment, no bleaching is carried out, and there is no sulfur residue. During the carboxymethylation reaction step, ammonium chloride is added as a buffer to improve the reaction uniformity and rate. These innovations greatly improve the utilization efficiency of raw materials, and through efficient industrial production optimization, the cost is reduced and the production efficiency is significantly improved. Specifically, through refined process optimization, the production efficiency can be increased by 30%, energy can be saved by 20%, and the cost can be reduced by 15%, making this technology feasible for large-scale industrial production. The implementation of the overall solution not only solves the problem of waste bamboo shoot shell resource utilization, but also provides an environmentally friendly and sustainable development solution, which can effectively promote resource recovery and utilization. Brief Description of the Drawings
[0024] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Embodiments
[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0026] Embodiment 1
[0027] As Figure 1 shown, the embodiment of the present invention provides a method for completely resourcefully preparing waste bamboo shoot shell brown pigment, dietary fiber and sodium carboxymethylcellulose, including: a. Extraction of brown pigment: Add waste bamboo shoot shell powder to 2% sodium hydroxide solution at a solid-liquid ratio of 1:10, extract for 60 minutes under slightly boiling conditions, and do not adjust the pH value of the extracted filtrate. Directly filter, concentrate and then dry and store. The filter residue is used for the subsequent preparation of dietary fiber and sodium carboxymethylcellulose. The concentration of the filtrate is 99.0%, and the obtained concentrated brown pigment solution is used in the fields of food and cosmetics.
[0028] b. Extraction of dietary fiber: Adjust the pH value of the filter residue after extracting brown pigment by adding 4% citric acid solution at a solid-liquid ratio of 1:10. After adjusting to neutral, press-filter and dry to obtain dietary fiber. The drying loss of the dietary fiber is 2.03%. In the preparation of dietary fiber, edible citric acid is used for adjustment, which is green and safe. The prepared dietary fiber is a sulfur-free product, the cellulose purity reaches more than 99%, and the water-soluble substance is 0.11%.
[0029] c. Preparation of sodium carboxymethyl cellulose: The waste bamboo shoot shell filter residue after extraction is subjected to carboxymethylation treatment at a reaction temperature of 80 - 90 °C and a reaction time of 60 - 120 minutes to obtain sodium carboxymethyl cellulose. The viscosity of sodium carboxymethyl cellulose reaches 492 mPa.s and the degree of etherification reaches above 0.54, meeting the standards for food additives and industrial use. During the carboxymethylation process, an amino acid catalyst is added, the reaction temperature is 80 °C, and the reaction time is controlled within 50 minutes. Amino acid catalysts have nucleophilicity, which can help with the transfer of electrons in the carboxymethylation reaction and enhance the reaction efficiency. As natural products, amino acids can catalyze under relatively mild conditions and have high biocompatibility. In the carboxymethylation reaction step, ammonium chloride is added as a buffer to improve the uniformity and rate of the reaction, ensuring the stable quality of sodium carboxymethyl cellulose. The concentration of ammonium chloride is 1% - 2% (w / v). As an acidic salt, ammonium chloride can provide a certain acidic environment, which helps the progress of the carboxymethylation reaction. In the synthesis process of sodium carboxymethyl cellulose, an acidic environment is usually required to promote the reaction between cellulose molecules and chloroacetic acid or other reaction reagents. The addition of ammonium chloride helps to stabilize and accelerate this reaction process, and the addition of ammonium chloride helps to improve the water solubility of sodium carboxymethyl cellulose. During the reaction process, ammonium chloride can regulate the ionic strength of the solution.
[0030] d. Concentration of brown pigment: The filtrate after extraction is concentrated to remove water, obtaining a concentrated brown pigment solution with a concentration of 99.0%, which is used as a natural pigment in the food and cosmetic fields. The color of the brown pigment is dark brown.
[0031] e. Green preparation of dietary fiber: The filter residue obtained after pigment extraction is adjusted by using edible citric acid to achieve the purpose of green preparation, ensuring safety in the food field. The prepared dietary fiber is a sulfur - free product, with a product purity of over 99% and a water - soluble substance content of 0.11%.
[0032] f. Filtration and separation: Through a filter screen or other separation equipment, the dietary fiber and sodium carboxymethyl cellulose are further separated and purified to ensure a low impurity content in the final product. The moisture content of the final product is controlled at 0.71%.
[0033] g. Final drying and storage: The brown pigment, dietary fiber, and sodium carboxymethyl cellulose are dried to obtain dry powder or other forms suitable for storage and transportation, and stored in a dry environment. The moisture content of the finally dried dietary fiber is 2%.
[0034] h. Detection and Quality Control: Conduct quality inspections on the obtained products, including but not limited to pH value, water content, and impurity content, to ensure compliance with food-grade or other industry standards. The obtained dietary fiber has no sulfur residue, the viscosity of sodium carboxymethylcellulose reaches 492 mPa·s, and the degree of etherification is above 0.54, meeting the standards for food additives and industrial use.
[0035] i. Optimization of Industrial Production: Optimize the process parameters according to the above steps to ensure high-efficiency and stable production during large-scale production, and reduce production costs. The optimized process flow can achieve the goals of a 30% increase in production efficiency, 20% energy conservation, and 15% cost reduction.
[0036] Example Two: Experimental Example
[0037] Experimental Purpose: This experiment aims to verify the complete resource utilization method for preparing brown pigment, dietary fiber, and sodium carboxymethylcellulose from waste bamboo shoot shells, ensure the efficient extraction and utilization of the effective components in waste bamboo shoot shells, optimize the process conditions, and improve production efficiency and product quality.
[0038] Experimental Materials:
[0039] Waste bamboo shoot shell powder
[0040] 2% sodium hydroxide solution
[0041] Food-grade citric acid
[0042] Amino acid catalyst
[0043] Ammonium chloride (1% - 2%)
[0044] Equipment: Micro-boiling extraction device, vacuum filtration equipment, drying equipment, pH meter, electronic balance, etc. Experimental Steps:
[0045] Step One: Extraction of Brown Pigment from Waste Bamboo Shoot Shells
[0046] Mix 100 g of waste bamboo shoot shell powder with 1 L of 2% sodium hydroxide solution at a solid-liquid ratio of 1:10.
[0047] Extract for 60 minutes under micro-boiling conditions, maintaining the temperature at about 80°C.
[0048] After extraction, do not adjust the pH value of the filtrate, and directly filter to remove impurities.
[0049] Concentrate the filtered filtrate to obtain a concentrated brown pigment solution with a concentration of 99.0%.
[0050] Further dry the brown pigment solution to obtain dark green powder, which is used as a natural pigment in the food and cosmetic fields.
[0051] Step Two: Preparation of Dietary Fiber
[0052] The filter residue after extracting the brown pigment is added to a 4% citric acid solution at a solid-liquid ratio of 1:10, and the pH value is adjusted at room temperature. After adjusting to neutral, it is pressure-filtered and dried to obtain dietary fiber, and the drying loss of the dietary fiber is 2.03%.
[0053] Step 3: Preparation of sodium carboxymethyl cellulose
[0054] The waste bamboo shoot shell filter residue (the filter residue after extraction) is subjected to carboxymethylation treatment.
[0055] At a reaction temperature of 80 °C, 1%-2% (w / v) ammonium chloride buffer is added, and the reaction time is 60 minutes.
[0056] During the reaction, an amino acid catalyst is added to increase the reaction rate.
[0057] After completing the carboxymethylation reaction, the viscosity of the obtained sodium carboxymethyl cellulose reaches 492 mPa·s, and the degree of etherification reaches above 0.54, meeting the food additive and industrial use standards.
[0058] Step 4: Drying and storage of products
[0059] The sodium carboxymethyl cellulose, dietary fiber, and brown pigment are dried.
[0060] The water content of the finally dried dietary fiber is 2%.
[0061] All products are stored in a dry environment to ensure their stability and long-term preservation.
[0062] Step 5: Quality control and detection
[0063] The obtained products are subjected to quality detection, including pH value, water content, impurity content, etc.
[0064] The detection results show that: the color of the brown pigment is dark brown, the pH value is 9.3, and the absorbance is 9.4. The purity of the dietary fiber reaches above 99%, and the water-soluble matter is 0.11%. The viscosity of the sodium carboxymethyl cellulose reaches 492 mPa·s, and the degree of etherification reaches above 0.54, meeting the food additive and industrial use standards.
[0065] Experimental results: Through the above technological steps, brown pigment, dietary fiber, and sodium carboxymethyl cellulose can be successfully extracted from waste bamboo shoot shells, and the efficiency of each step has been optimized. Finally, the obtained brown pigment, dietary fiber, and sodium carboxymethyl cellulose are of stable quality and meet the food-grade and industrial use standards.
[0066] Table 1: Determination results of brown pigment
[0067]
[0068] Table 2: Dietary Fiber Measurement Results
[0069]
[0070] Table 3: Sodium Carboxymethylcellulose Measurement Results
[0071]
[0072] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A method for completely recycling brown pigment, dietary fiber and sodium carboxymethyl cellulose from discarded bamboo shoot shells, characterized in that: include: a. Extraction of brown pigment: The discarded bamboo shoot shell powder was added to a 2% sodium hydroxide solution at a solid-liquid ratio of 1:10, and extracted for 60 minutes under slightly boiling conditions. The filtrate after extraction did not need to adjust the pH value, was directly filtered, concentrated and dried for storage, and the filter residue was used for subsequent preparation of dietary fiber and sodium carboxymethyl cellulose. The filtrate concentration was 99.0%, and the concentrated brown pigment solution was used in the field of food and cosmetics; b. Preparation of dietary fiber: The residue after extraction of brown pigment was added with 4% citric acid solution at a solid-liquid ratio of 1:10 to adjust the pH value, adjusted to neutral, filtered and dried to obtain dietary fiber, the drying loss of dietary fiber was 2.03%; c. Preparation of sodium carboxymethyl cellulose: Carboxymethylate the residue after extracting the brown pigment at a reaction temperature of 80-90°C for 60-120 minutes to obtain sodium carboxymethyl cellulose, the pH value of which is 6.60; d. Concentration of brown pigment: The filtrate obtained by extraction is concentrated to remove water to obtain a concentrated brown pigment solution with a concentration of 99.0%. It is used as a natural pigment in the fields of food and cosmetics. The color of the brown pigment is dark brown; e. Green preparation of dietary fiber: The filter residue obtained after the pigment is extracted is adjusted with edible citric acid to achieve the purpose of green preparation and ensure safety in the food field. The prepared dietary fiber is a sulfur-free product; f. Filtration and separation: Dietary fiber and sodium carboxymethyl cellulose are further separated and purified through filters or other separation equipment to ensure that the impurity content in the final product is low and the moisture content of the final product is controlled at 0.71%; g. Final drying and storage: The brown pigment, dietary fiber and sodium carboxymethyl cellulose are dried to obtain a dry powder or other form suitable for storage and transportation, and stored in a dry environment. The moisture content of the dietary fiber after final drying is 2%; h. Testing and quality control: Conduct quality testing on the obtained products, including but not limited to pH value, water content, and impurity content, to ensure that they meet food grade or other industry standards. The obtained dietary fiber has no sulfur residue, the viscosity of sodium carboxymethyl cellulose reaches 492mPa.s, and the etherification degree reaches above 0.54, meeting the standards for food additives and industrial use; i. Industrial production optimization: Optimize the process parameters according to the above steps to ensure efficient and stable output in large-scale production and reduce production costs. The optimized process flow can achieve the goals of increasing production efficiency by 30%, saving energy by 20%, and reducing costs by 15%.
2. The method for completely recycling the brown pigment, dietary fiber and sodium carboxymethyl cellulose from discarded bamboo shoot shells according to claim 1, characterized in that: The brown pigment extraction does not require pH adjustment, and can be directly filtered and concentrated into a paste for storage, thereby achieving energy-saving production.
3. The method for completely recycling the brown pigment, dietary fiber and sodium carboxymethyl cellulose from discarded bamboo shoot shells according to claim 1, characterized in that: During the preparation of the dietary fiber, food-grade citric acid is added for adjustment, and no sulfur residue is left, thereby ensuring the safety of the product.
4. The method for completely recycling the brown pigment, dietary fiber and sodium carboxymethyl cellulose from discarded bamboo shoot shells according to claim 1, characterized in that: During the carboxymethylation treatment, an amino acid catalyst is added, the reaction temperature is 80° C., and the reaction time is controlled within 50 minutes.
5. The method for completely recycling the brown pigment, dietary fiber and sodium carboxymethyl cellulose from discarded bamboo shoot shells according to claim 1, characterized in that: The preparation of the dietary fiber is regulated by using food-grade citric acid, has no sulfur residue, and has a cellulose purity of more than 99%.
6. The method for completely recycling the brown pigment, dietary fiber and sodium carboxymethyl cellulose from discarded bamboo shoot shells according to claim 1, characterized in that: In the carboxymethylation reaction step, ammonium chloride is added as a buffer to improve the uniformity and rate of the reaction and ensure the quality stability of the sodium carboxymethyl cellulose. The concentration of the ammonium chloride is 1%-2% (w / v).
7. The method for completely recycling the brown pigment, dietary fiber and sodium carboxymethyl cellulose from discarded bamboo shoot shells according to claim 1, characterized in that: The dietary fiber is processed by a water washing step to further remove residual impurities, ensuring that the purity of the final product reaches more than 99% and the water-soluble matter is less than 0.24%.