Method for efficiently producing high-purity gutta-percha
By combining chemical, mechanical and air float methods, the complex extraction process of Eucommia ulmoides rubber is solved, and efficient and low-cost high-purity Eucommia ulmoides rubber production is achieved, which alleviates the pressure of rubber resources relying on imports.
Patent Information
- Application Number
- CN202411355966.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-01-10
AI Technical Summary
In the prior art, the extraction process of Eucommia ulmoides is complex, time-consuming and difficult to achieve large-scale production. In addition, traditional methods have problems such as severe loss of rubber wire, low purity or requiring a large amount of organic solvents, resulting in environmental pollution.
Combining chemical method, mechanical method and air float method, pretreatment is used for cooking liquid, and a high-concentration continuous disk mill is used for mechanical disk grinding. The air float method assists in removing impurities, and obtains high-purity natural glue through gas inlet and water separation. Eucommia ulmoides in silk state.
It realizes efficient and low-cost extraction of Eucommia ulmoides, reduces the loss of rubber wire, improves yield and purity, avoids the use of organic solvents to pollute the environment, and provides a new idea for industrial production of Eucommia ulmoides.
Smart Images
Figure HDA0005063608830000011
Abstract
Description
Technical Field
[0001] The invention belongs to the field of biomass refining, and specifically relates to a method for preparing high-purity eucommia gum from eucommia gum-containing raw materials (including but not limited to bark, seed coat and leaves). Background Art
[0002] Eucommia gum (EUR), also known as tooth gum, is found in the fruit, bark, leaves and roots of Eucommia ulmoides. The main component of Eucommia gum is trans-1,4-polyisoprene, which is an isomer of natural rubber (NR). Due to its soft, symmetrical, ordered, double-bond-rich molecular chain structure and crystal structure, it exhibits a unique rubber-plastic duality. It exhibits the characteristics of plastic at room temperature, but exhibits the characteristics of rubber when heated or vulcanized. Eucommia gum has a wide range of applications and can be used to mix with other materials to improve the performance of composite materials and prepare shape memory functional materials.
[0003] The output of natural eucommia gum is limited, far lower than natural rubber. In its natural state, eucommia gum exists in the seeds, bark, leaves and roots of eucommia trees in solid form. It is difficult to directly collect it by simple methods. The extraction process is relatively complicated. No cost-effective and efficient method has been developed to extract eucommia gum, which seriously restricts the industrialization development of eucommia gum. At present, the main methods for extracting eucommia gum are mechanical method, alkali method, solvent method and microbial enzymolysis method. The mechanical method destroys the cell wall of eucommia to expose the gum filaments. It is simple to operate and easy to industrialize, but the gum filaments are seriously lost, the yield is reduced, and the purity is low. The alkali method uses alkali solution to degrade the cuticle, loosen the cell wall, remove impurities in the raw material, and the process is simple, but the purity of the extracted crude gum is low. The solvent method uses organic solvents to extract eucommia gum, which has high purity, but low extraction efficiency, and a large amount of organic solvents are used to pollute the environment. The microbial method uses enzymatic hydrolysis to extract high-purity eucommia gum, but the cultivation period of microorganisms is long and it is difficult to enzymatically hydrolyze most non-gelatin plant tissues. It still needs to be combined with other methods for subsequent processing to obtain high-purity eucommia gum.
[0004] The present invention combines the traditional chemical pretreatment and mechanical disc grinding methods, adopts pulping machinery and equipment in the papermaking industry, and uses air flotation to assist in preparing light-colored high-purity eucommia gum. The method can not only obtain high-purity eucommia gum in a natural rubber filament state, but also provides a new idea for the industrial production of eucommia gum, alleviating the pressure of my country's dependence on imported rubber resources. Summary of the invention
[0005] The invention organically combines a chemical method, a mechanical method and an air flotation method to provide a method for preparing eucommia gum which is efficient, can retain a natural filamentous structure and is highly pure.
[0006] The technical solution adopted by the present invention is as follows:
[0007] A method for efficiently producing high-purity eucommia gum comprises the following steps:
[0008] Step (1): pretreating the raw material of Eucommia ulmoides;
[0009] Step (2): using a cooking liquid to cook the pretreated Eucommia raw material in a cooking pot, and retaining the black liquor produced after cooking together with the cooked Eucommia raw material;
[0010] Step (3): mechanically grinding the eucommia gum raw material and the black liquor obtained in step (2) through a high-concentration continuous disc grinder, filtering the eucommia gum after grinding to remove the black liquor, and obtaining agglomerated rubber filaments containing impurities;
[0011] Step (4): the agglomerated rubber filaments obtained in step (3) and clean water are passed through a high-concentration continuous disc grinder for further mechanical disc grinding to further remove non-gel tissue and improve the purity of eucommia gum;
[0012] Step (5): dispersing the eucommia gum silk obtained in step (4) in a water tank, allowing the silk silk to float to the liquid surface after standing, and separating the impurities by precipitation, and scooping out the upper layer of the silk silk on the liquid surface, and repeating this step to obtain crude eucommia gum;
[0013] Step (6): Disperse the crude eucommia gum in clean water, and introduce gas into the eucommia gum silk ball. After the ventilation is completed, dehydrate and dry the eucommia gum to obtain milky white high-purity eucommia gum that retains the natural gum silk state.
[0014] Furthermore, in the step (1), the raw material of Eucommia ulmoides is Eucommia ulmoides bark or Eucommia ulmoides seed coat; when the raw material of Eucommia ulmoides is Eucommia ulmoides seed coat, the pretreatment is sorting and air showering for dust removal; when the raw material of Eucommia ulmoides is Eucommia ulmoides bark, the pretreatment is sorting and treating the surface of the bark with a scraper to remove ineffective components on the surface.
[0015] Furthermore, in the step (2), the cooking pot used is a cooking pot used for pulping in the papermaking industry; the solid-liquid ratio of the Eucommia raw material to the cooking liquid is 1:5, the cooking temperature is 110-160°C, the heating time is 1h, and the heating time is 2-4h.
[0016] Furthermore, in step (2), the cooking liquid is one of sodium hydroxide, sodium hydroxide + sodium sulfide, sodium hydroxide + anthraquinone, base + combined acid + free acid, sodium bisulfite, sodium hydroxide + sodium sulfite, and sodium hydroxide + ammonium sulfite.
[0017] Furthermore, in the step (3), the number of mechanical grinding is 5-7 times, and the grinding interval is 0.3 mm.
[0018] Furthermore, in the step (4), the mass ratio of clean water to Eucommia ulmoides raw material is 1:5-1:20, the number of mechanical disc grinding is 5-7 times, and the disc grinding interval is 0.3 mm.
[0019] Furthermore, in the step (5), the number of cycles of repeatedly cycling this step is 3-5 times.
[0020] Furthermore, in step (6), the gas introduced is air, nitrogen, carbon dioxide or helium, the gas flow rate is 100-500 mL / min, and the ventilation time is 1-12 h.
[0021] The present invention firstly uses cooking liquid to destroy and degrade non-glue plant tissues of eucommia raw materials, which is conducive to further separation of eucommia gum and non-glue plant tissues in eucommia raw materials by a high-concentration continuous mechanical disc grinder. Secondly, by utilizing the low density of eucommia gum, which floats on the water surface, and the large density of impurities, which sink to the bottom of the water, water-soluble components and fine impurity fragments without glue are further removed, so as to achieve the purpose of separating the glue from the impurities. Finally, in the process of air flotation-assisted impurity removal, the generated bubbles can drive the flow of water, flush and peel off the plant tissue fragments on the surface of eucommia gum, so that the plant tissue fragments are peeled off from the surface of eucommia gum, thereby playing a cleaning role, and finally obtaining high-purity eucommia gum.
[0022] Compared with the prior art, the present invention has the following beneficial effects:
[0023] 1. Combining chemical method, mechanical method and air flotation method, it has high production efficiency, less loss of rubber thread, high productivity, no need for organic solvent extraction, and the purity of Eucommia gum products is high.
[0024] 2. It solves the problems of complicated and time-consuming process of extracting Eucommia gum.
[0025] 3. Utilize the matching of pulping production equipment in the papermaking industry to solve the problem of difficulty in large-scale production of eucommia gum extracted from eucommia raw materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a picture of the milky white high-purity Eucommia gum obtained in Example 1 that retains the natural gum thread state. DETAILED DESCRIPTION
[0027] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. However, it should be understood that the protection scope of the present invention is not limited by the specific implementation methods.
[0028] Example 1
[0029] A method for efficiently producing high-purity eucommia gum, the steps are as follows:
[0030] (1) Take the Eucommia ulmoides seed coat, sort it, and remove dust by air showering.
[0031] (2) Take 400 g of Eucommia ulmoides seed coat, mix it with a 5% NaOH solution, and cook it in a cooking pot. The cooking temperature is 110°C, the temperature is raised for 1 hour, and the heating time is 2 hours. The black liquor produced after cooking is retained together with the cooked Eucommia ulmoides seed coat.
[0032] (3) The eucommia seed coat and black liquor obtained in step (2) are passed through a high-concentration continuous disc grinder for mechanical disc grinding 5 times, with a disc grinding interval of 0.3 mm. The eucommia gum after disc grinding is filtered through a pulp bag to remove the black liquor, thereby obtaining agglomerated rubber threads containing a large amount of impurities, and the rubber threads are initially exposed.
[0033] (4) The agglomerated rubber fibers obtained in step (3) are passed through a high-concentration continuous disc grinder together with clean water for mechanical disc grinding seven times, wherein the mass ratio of clean water to eucommia seed coat is 1:20 and the disc grinding interval is 0.3 mm, so as to further remove non-gel tissue and improve the purity of eucommia gum.
[0034] (5) Disperse the eucommia gum threads obtained in step (4) in a water tank. After standing for a short time, the gum threads float to the liquid surface, and the impurities are precipitated and separated. The gum threads on the upper layer of the liquid surface are scooped out. Repeat this step 5 times to obtain crude eucommia gum.
[0035] (6) Disperse the crude eucommia gum in clean water, and introduce air into the eucommia gum silk ball through an air pump at a flow rate of 500 mL / min for 12 h. After the ventilation is completed, the eucommia gum is dehydrated and dried to obtain milky white, natural eucommia gum silk with high purity. Figure 1 shown.
[0036] (7) After drying, the extraction rate of Eucommia gum was determined to be 20.23% of the weight of Eucommia seed coat, and the purity was 99.1%.
[0037] Example 2
[0038] A method for efficiently producing high-purity eucommia gum, the steps are as follows:
[0039] (1) Take the Eucommia ulmoides seed coat, sort it, and remove dust by air showering.
[0040] (2) Take 400 g of Eucommia ulmoides seed coat, mix it with a 5% NaOH solution, and cook it in a cooking pot at a solid-liquid ratio of 1:5. The cooking temperature is 110°C, the temperature is raised for 1 hour, and the heating time is 2 hours. The black liquor produced after cooking is retained together with the cooked Eucommia ulmoides seed coat.
[0041] (3) The eucommia seed coat and black liquor obtained in step (2) are passed through a high-concentration continuous disc grinder for mechanical disc grinding 5 times, with a disc grinding interval of 0.3 mm. The eucommia gum after disc grinding is filtered through a pulp bag to remove the black liquor, thereby obtaining agglomerated rubber threads containing a large amount of impurities, and the rubber threads are initially exposed.
[0042] (4) The agglomerated rubber fibers obtained in step (3) are passed through a high-concentration continuous disc grinder together with clean water for mechanical disc grinding seven times, wherein the mass ratio of clean water to eucommia seed coat is 1:10 and the disc grinding interval is 0.3 mm, so as to further remove non-gel tissue and improve the purity of eucommia gum.
[0043] (5) Disperse the eucommia gum threads obtained in step (4) in a water tank. After standing for a short time, the gum threads float to the liquid surface, and the impurities are precipitated and separated. The gum threads on the upper layer of the liquid surface are scooped out. Repeat this step 3 times to obtain crude eucommia gum.
[0044] (6) The crude eucommia gum was dispersed in clean water, and air was introduced into the eucommia gum silk ball through an air pump at a flow rate of 200 mL / min for 1 h. After the ventilation was completed, the eucommia gum was dehydrated and dried to obtain high-purity eucommia gum with a milky white color and a natural gum silk state.
[0045] (7) After drying, the extraction rate of Eucommia gum was determined to be 20.82% of the weight of Eucommia seed coat, and the purity was 98.20%.
[0046] Example 3
[0047] A method for efficiently producing high-purity eucommia gum, the steps are as follows:
[0048] (1) Take the Eucommia ulmoides seed coat, sort it, and remove dust by air showering.
[0049] (2) Take 400 g of Eucommia ulmoides seed coat, mix it with a 5% NaOH solution, and cook it in a cooking pot at a solid-liquid ratio of 1:5. The cooking temperature is 140°C, the temperature is raised for 1 hour, and the heating time is 3 hours. The black liquor produced after cooking is retained together with the cooked Eucommia ulmoides seed coat.
[0050] (3) The eucommia seed coat and black liquor obtained in step (2) are passed through a high-concentration continuous disc grinder for mechanical disc grinding 5 times, with a disc grinding interval of 0.3 mm. The eucommia gum after disc grinding is filtered through a pulp bag to remove the black liquor, thereby obtaining agglomerated rubber threads containing a large amount of impurities, and the rubber threads are initially exposed.
[0051] (4) The agglomerated rubber fibers obtained in step (3) are passed through a high-concentration continuous disc grinder together with clean water for mechanical disc grinding seven times, wherein the mass ratio of clean water to eucommia seed coat is 1:5 and the disc grinding interval is 0.3 mm, so as to further remove non-gel tissue and improve the purity of eucommia gum.
[0052] (5) Disperse the eucommia gum threads obtained in step (4) in a water tank. After standing for a short time, the gum threads float to the liquid surface, and the impurities are precipitated and separated. The gum threads on the upper layer of the liquid surface are scooped out. Repeat this step 4 times to obtain crude eucommia gum.
[0053] (6) The crude eucommia gum was dispersed in clean water, and air was introduced into the eucommia gum silk ball through an air pump at a flow rate of 100 mL / min for 1 h. After the ventilation was completed, the eucommia gum was dehydrated and dried to obtain high-purity eucommia gum with a milky white color and a natural gum silk state.
[0054] (7) After drying, the extraction rate of Eucommia gum was determined to be 20.53% of the weight of Eucommia seed coat, and the purity was 98.78%.
[0055] Example 4
[0056] A method for efficiently producing high-purity eucommia gum, the steps are as follows:
[0057] (1) Take the Eucommia ulmoides seed coat, sort it, and remove dust by air showering.
[0058] (2) Take 400 g of Eucommia ulmoides seed coat, mix it with a 10% NaOH solution, and cook it in a cooking pot at a solid-liquid ratio of 1:5. The cooking temperature is 110°C, the temperature is raised for 1 hour, and the heating time is 2 hours. The black liquor produced after cooking is retained together with the cooked Eucommia ulmoides seed coat.
[0059] (3) The eucommia seed coat and black liquor obtained in step (2) are passed through a high-concentration continuous disc grinder for mechanical disc grinding 5 times, with a disc grinding interval of 0.3 mm. The eucommia gum after disc grinding is filtered through a pulp bag to remove the black liquor, thereby obtaining agglomerated rubber threads containing a large amount of impurities, and the rubber threads are initially exposed.
[0060] (4) The agglomerated rubber fibers obtained in step (3) are passed through a high-concentration continuous disc grinder together with clean water for mechanical disc grinding seven times, wherein the mass ratio of clean water to eucommia seed coat is 1:20 and the disc grinding interval is 0.3 mm, so as to further remove non-gel tissue and improve the purity of eucommia gum.
[0061] (5) Disperse the eucommia gum threads obtained in step (4) in a water tank. After standing for a short time, the gum threads float to the liquid surface, and the impurities are precipitated and separated. The gum threads on the upper layer of the liquid surface are scooped out. Repeat this step 3 times to obtain crude eucommia gum.
[0062] (6) The crude eucommia gum was dispersed in clean water, and air was introduced into the eucommia gum silk ball through an air pump at a flow rate of 200 mL / min for 1 h. After the ventilation was completed, the eucommia gum was dehydrated and dried to obtain high-purity eucommia gum with a milky white color and a natural gum silk state.
[0063] (7) After drying, the extraction rate of Eucommia gum was determined to be 20.62% of the weight of Eucommia seed coat, and the purity was 98.87%.
[0064] Example 5
[0065] A method for efficiently producing high-purity eucommia gum, the steps are as follows:
[0066] (1) Take the Eucommia ulmoides seed coat, sort it, and remove dust by air showering.
[0067] (2) Take 400 g of Eucommia ulmoides seed coat, mix it with a 5% NaOH solution, and cook it in a cooking pot at a solid-liquid ratio of 1:5. The cooking temperature is 110°C, the temperature is raised for 1 hour, and the heating time is 2 hours. The black liquor produced after cooking is retained together with the cooked Eucommia ulmoides seed coat.
[0068] (3) The eucommia seed coat and black liquor obtained in step (2) are passed through a high-concentration continuous disc grinder for mechanical disc grinding for 6 times, with a disc grinding interval of 0.3 mm. The eucommia gum after disc grinding is filtered through a pulp bag to remove the black liquor, thereby obtaining agglomerated rubber threads containing a large amount of impurities, and the rubber threads are initially exposed.
[0069] (4) The agglomerated rubber fibers obtained in step (3) are passed through a high-concentration continuous disc grinder together with clean water for mechanical disc grinding 6 times, wherein the mass ratio of clean water to eucommia seed coat is 1:20 and the disc grinding interval is 0.3 mm, so as to further remove non-gelatinous tissues and improve the purity of eucommia gum.
[0070] (5) Disperse the eucommia gum threads obtained in step (4) in a water tank. After standing for a short time, the gum threads float to the liquid surface, and the impurities are precipitated and separated. The gum threads on the upper layer of the liquid surface are scooped out. Repeat this step 3 times to obtain crude eucommia gum.
[0071] (6) The crude eucommia gum was dispersed in clean water, and nitrogen was introduced into the eucommia gum silk group at a flow rate of 200 mL / min for 1 h. After the ventilation was completed, the eucommia gum was dehydrated and dried to obtain high-purity eucommia gum with a milky white color and a natural rubber silk state.
[0072] (7) After drying, the extraction rate of Eucommia gum was determined to be 20.51% of the weight of Eucommia seed coat, and the purity was 98.52%.
[0073] Example 6
[0074] A method for efficiently producing high-purity eucommia gum, the steps are as follows:
[0075] (1) Take the bark of Eucommia ulmoides, sort it, and treat the surface of the bark with a scraper to remove the ineffective components on the surface.
[0076] (2) Take 400g of Eucommia bark, mix it with a cooking liquid formed by a 20% mass concentration of NaOH solution and an 8% mass concentration of Na2S solution, with a solid-liquid ratio of 1:5 (i.e., 5mL of cooking liquid is required for every 1g of Eucommia bark), and cook it in a cooking pot. The cooking temperature is 160°C, the temperature is raised for 1h, and the heating is continued for 4h. The black liquor produced after cooking is retained together with the cooked Eucommia bark.
[0077] (3) The cooked Eucommia bark and black liquor obtained in step (2) are passed through a high-concentration continuous disc grinder for mechanical disc grinding for 7 times, with a disc grinding interval of 0.3 mm. The Eucommia gum after disc grinding is filtered through a pulp bag to remove the black liquor, and agglomerated rubber threads containing a large amount of impurities are obtained, and the rubber threads are initially exposed.
[0078] (4) The agglomerated rubber fibers obtained in step (3) are passed through a high-concentration continuous disc grinder together with clean water for mechanical disc grinding 5 times, wherein the mass ratio of clean water to eucommia bark is 1:20 and the disc grinding spacing is 0.3 mm, so as to further remove non-gel tissue and improve the purity of eucommia gum.
[0079] (5) Disperse the eucommia gum threads obtained in step (4) in a water tank. After standing for a short time, the gum threads float to the liquid surface, and the impurities are precipitated and separated. The gum threads on the upper layer of the liquid surface are scooped out. Repeat this step 3 times to obtain crude eucommia gum.
[0080] (6) The crude eucommia gum was dispersed in clean water, and air was introduced into the eucommia gum silk ball through an air pump at a flow rate of 200 mL / min for 9 h. After the ventilation was completed, the eucommia gum was dehydrated and dried to obtain high-purity eucommia gum with a milky white color and a natural gum silk state.
[0081] (7) After drying, the extraction rate of Eucommia gum was determined to be 7.76% of the weight of Eucommia bark and the purity was 96.11%.
[0082] Example 7
[0083] A method for efficiently producing high-purity eucommia gum, the steps are as follows:
[0084] (1) Take the bark of Eucommia ulmoides, sort it, and treat the surface of the bark with a scraper to remove the ineffective components on the surface.
[0085] (2) Take 400g of Eucommia bark, mix it with 20% NaOH and 8% Na2S solution, with a solid-liquid ratio of 1:5, and cook it in a cooking pot. The cooking temperature is 160°C, the temperature is raised for 1h, and the heating is continued for 3h. The black liquor produced after cooking is retained together with the cooked Eucommia bark.
[0086] (3) The cooked Eucommia bark and black liquor obtained in step (2) are passed through a high-concentration continuous disc grinder for mechanical disc grinding for 7 times, with a disc grinding interval of 0.3 mm. The Eucommia gum after disc grinding is filtered through a pulp bag to remove the black liquor, and agglomerated rubber threads containing a large amount of impurities are obtained, and the rubber threads are initially exposed.
[0087] (4) The agglomerated rubber fibers obtained in step (3) are passed through a high-concentration continuous disc grinder together with clean water for mechanical disc grinding 5 times, wherein the mass ratio of clean water to eucommia bark is 1:20 and the disc grinding spacing is 0.3 mm, so as to further remove non-gel tissue and improve the purity of eucommia gum.
[0088] (5) Disperse the eucommia gum threads obtained in step (4) in a water tank. After standing for a short time, the gum threads float to the liquid surface, and the impurities are precipitated and separated. The gum threads on the upper layer of the liquid surface are scooped out. Repeat this step 3 times to obtain crude eucommia gum.
[0089] (6) The crude eucommia gum was dispersed in clean water, and air was introduced into the eucommia gum silk ball through an air pump at a flow rate of 200 mL / min for 1 h. After the ventilation was completed, the eucommia gum was dehydrated and dried to obtain high-purity eucommia gum with a milky white color and a natural gum silk state.
[0090] (7) After drying, the extraction rate of Eucommia gum was determined to be 8.04% of the weight of Eucommia bark and the purity was 95.57%.
[0091] Comparative Example 1
[0092] Different ventilation durations were used to treat eucommia gum prepared from eucommia seed coats to verify the effect of air flotation-assisted impurity removal. The steps are as follows:
[0093] (1) Take the Eucommia ulmoides seed coat, sort it, and remove dust by air showering.
[0094] (2) Take 400 g of Eucommia ulmoides seed coat, mix it with a 5% NaOH solution, and cook it in a cooking pot at a solid-liquid ratio of 1:5. The cooking temperature is 110°C, the temperature is raised for 1 hour, and the heating time is 2 hours. The black liquor produced after cooking is retained together with the cooked Eucommia ulmoides seed coat.
[0095] (3) The eucommia seed coat and black liquor obtained in step (2) are passed through a high-concentration continuous disc grinder for mechanical disc grinding 5 times, with a disc grinding interval of 0.3 mm. The eucommia gum after disc grinding is filtered through a pulp bag to remove the black liquor, and agglomerated rubber threads containing a large amount of impurities are obtained, and the rubber threads are initially exposed.
[0096] (4) The agglomerated rubber fibers obtained in step (3) are passed through a high-concentration continuous disc grinder together with clean water for mechanical disc grinding seven times, wherein the mass ratio of clean water to eucommia seed coat is 1:20 and the disc grinding interval is 0.3 mm, so as to further remove non-gel tissue and improve the purity of eucommia gum.
[0097] (5) The obtained eucommia gum threads are dispersed in a water tank. After a short period of standing, the gum threads float to the liquid surface, and the impurities are precipitated and separated. The gum threads on the upper layer of the liquid surface are scooped out. This step is repeated three times to obtain crude eucommia gum.
[0098] (6) Disperse the crude eucommia gum in clean water, and introduce air into the eucommia gum silk ball through an air pump at a flow rate of 200 mL / min for 0 h / 1 h / 3 h / 6 h / 9 h / 12 h. After the ventilation is completed, dehydrate the eucommia gum and dry it.
[0099] (7) The purities of the eucommia gum obtained after ventilation for 0 h, 1 h, 3 h, 6 h, 9 h, and 12 h were measured after drying and were 92.26%, 98.2%, 98.63%, 98.28%, 98.52%, and 99.10%, respectively.
[0100] Comparative Example 2
[0101] Different ventilation times were used to treat eucommia gum prepared from eucommia bark to verify the effect of air flotation method in assisting impurity removal. The steps are as follows:
[0102] (1) Take the bark of Eucommia ulmoides, sort it, and treat the surface of the bark with a scraper to remove the ineffective components on the surface.
[0103] (2) Take 400g of Eucommia bark, mix it with 20% NaOH and 8% Na2S solution, with a solid-liquid ratio of 1:5, and cook it in a cooking pot. The cooking temperature is 160°C, the temperature is raised for 1h, and the heating is continued for 3h. The black liquor produced after cooking is retained together with the cooked Eucommia bark.
[0104] (3) The boiled Eucommia bark and black liquor obtained in step (2) are passed through a high-concentration continuous disc grinder for mechanical disc grinding for 7 times, with a disc grinding interval of 0.3 mm. The Eucommia gum after disc grinding is filtered through a pulp bag to remove the black liquor, and agglomerated rubber threads containing a large amount of impurities are obtained, and the rubber threads are initially exposed.
[0105] (4) The agglomerated rubber fibers obtained in step (3) are passed through a high-concentration continuous disc grinder together with clean water for mechanical disc grinding 5 times, wherein the mass ratio of clean water to eucommia bark is 1:20 and the disc grinding spacing is 0.3 mm, so as to further remove non-gel tissue and improve the purity of eucommia gum.
[0106] (5) Disperse the eucommia gum threads obtained in step (4) in a water tank. After standing for a short time, the gum threads float to the liquid surface, and the impurities are precipitated and separated. The gum threads on the upper layer of the liquid surface are scooped out. Repeat this step 3 times to obtain crude eucommia gum.
[0107] (6) Disperse the crude eucommia gum in clean water, and introduce air into the eucommia gum silk ball through an air pump at a flow rate of 200 mL / min for 0 h / 1 h / 3 h / 5 h / 7 h / 9 h. After the ventilation is completed, dehydrate the eucommia gum and dry it.
[0108] (7) The purities of the eucommia gum obtained after ventilation for 0 h, 1 h, 3 h, 5 h, 7 h, and 9 h were measured after drying to be 84.87%, 95.57%, 96.22%, 96.31%, 96.58%, and 96.11%, respectively.
Claims
1. A method for efficiently producing high-purity eucommia gum, characterized in that: The following steps are involved: Step (1): pretreating the raw material of Eucommia ulmoides; Step (2): using a cooking liquid to cook the pretreated Eucommia raw material in a cooking pot, and retaining the black liquor produced after cooking together with the cooked Eucommia raw material; Step (3): mechanically grinding the eucommia gum raw material and the black liquor obtained in step (2) through a high-concentration continuous disc grinder, filtering the eucommia gum after grinding to remove the black liquor, and obtaining agglomerated rubber filaments containing impurities; Step (4): the agglomerated rubber filaments obtained in step (3) and clean water are passed through a high-concentration continuous disc grinder for further mechanical disc grinding to further remove non-gel tissue and improve the purity of eucommia gum; Step (5): dispersing the eucommia gum silk obtained in step (4) in a water tank, allowing the silk silk to float to the liquid surface after standing, and separating the impurities by precipitation, and scooping out the upper layer of the silk silk on the liquid surface, and repeating this step to obtain crude eucommia gum; Step (6): Disperse the crude eucommia gum in clean water, and introduce gas into the eucommia gum silk ball. After the ventilation is completed, dehydrate and dry the eucommia gum to obtain milky white high-purity eucommia gum that retains the natural gum silk state.
2. A method for efficiently producing high-purity eucommia gum as claimed in claim 1, characterized in that: In the step (1), the raw material of Eucommia ulmoides is Eucommia ulmoides bark or Eucommia ulmoides seed coat; when the raw material of Eucommia ulmoides is Eucommia ulmoides seed coat, the pretreatment is sorting and air showering for dust removal; when the raw material of Eucommia ulmoides is Eucommia ulmoides bark, the pretreatment is sorting and treating the surface of the bark with a scraper to remove ineffective components on the surface.
3. A method for efficiently producing high-purity eucommia gum as claimed in claim 1, characterized in that: In the step (2), the cooking pot used is a cooking pot used for pulping in the papermaking industry; the solid-liquid ratio of the Eucommia raw material to the cooking liquid is 1:5, the cooking temperature is 110-160°C, the heating time is 1h, and the heating time is 2-4h.
4. A method for efficiently producing high-purity eucommia gum as claimed in claim 1, characterized in that: In the step (2), the cooking liquid is one of sodium hydroxide, sodium hydroxide + sodium sulfide, sodium hydroxide + anthraquinone, base + combined acid + free acid, sodium bisulfite, sodium hydroxide + sodium sulfite, and sodium hydroxide + ammonium sulfite.
5. A method for efficiently producing high-purity eucommia gum as claimed in claim 1, characterized in that: In the step (3), the number of mechanical grinding is 5-7 times, and the grinding interval is 0.3 mm.
6. A method for efficiently producing high-purity eucommia gum as claimed in claim 1, characterized in that: In the step (4), the mass ratio of clean water to Eucommia ulmoides raw material is 1:5-1:20, the number of mechanical disc grinding is 5-7 times, and the disc grinding interval is 0.3 mm.
7. A method for efficiently producing high-purity eucommia gum as claimed in claim 1, characterized in that: In the step (5), the number of cycles of the step is 3-5.
8. A method for efficiently producing high-purity eucommia gum as claimed in claim 1, characterized in that: In the step (6), the gas introduced is air, nitrogen, carbon dioxide or helium, the gas flow rate is 100-500 mL / min, and the ventilation time is 1-12 h.