Chemical modification device for starch

Abstract

The utility model discloses a starch chemical modification device, which relates to the technical field of starch modification, and comprises a three-necked flask, a working table, and an air supply mechanism, a heating mechanism and a clamping mechanism which are sequentially arranged on the working table, the bottom of the three-necked flask is positioned in the heating mechanism, and the top of the three-necked flask is sequentially provided with an air vent, a volatilization port and a feeding port; the ventilation port is connected with a gas supply mechanism, the volatilization port is connected with a condensation reflux mechanism, the clamping mechanism is used for clamping and fixing the condensation reflux mechanism, and the three-necked flask is used for preparing ionic liquid and chemically modifying starch. According to the device, various conditions such as heating, reflux and nitrogen protection required by ionic liquid preparation can be met, the preparation effect is good, and starch can be chemically modified after preparation is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of starch modification, in particular to a starch chemical modification device. Background Art

[0002] Starch is one of the most abundant polysaccharides in nature. The ordered multi-scale structure of starch granules determines that starch can be used as an excellent raw material for different uses and functions and biodegradable materials, and plays an important role in the food industry.

[0003] Due to its high amylose content, high-amylose starch exhibits physical and chemical properties different from ordinary starch and has high added value. Therefore, it has very broad application prospects in food, textile, papermaking, packaging and medical fields. However, when used as a raw material, high-amylose starch has a dense structure, a high gelatinization temperature greater than 100°C, and is insoluble in most solvents, which seriously limits its commercial use. In recent years, ionic liquids (ILs), as a new type of green solvent, have many advantages over traditional organic solvents and have been gradually applied in the study of starch dissolution. However, the production conditions of the ionic liquid system are complex, requiring a combination of heating, reflux, nitrogen protection and other conditions. At present, there is no molded device for the preparation of ionic liquids and chemical modification of starch using the prepared ionic liquids. Utility Model Content

[0004] In view of this, the utility model provides a starch chemical modification device to solve the problems raised in the above background technology.

[0005] A starch chemical modification device comprises a three-necked flask, a workbench, and a gas supply mechanism, a heating mechanism and a clamping mechanism arranged on the workbench in sequence, wherein the bottom of the three-necked flask is located in the heating mechanism, and the top of the three-necked flask is provided with a vent, a volatilization port and a feeding port in sequence, the vent is connected to the gas supply mechanism, the volatilization port is connected to a condensation reflux mechanism, the clamping mechanism is used to clamp and fix the condensation reflux mechanism, and the three-necked flask is used for preparing ionic liquid and chemically modifying starch.

[0006] Furthermore, the condensation reflux mechanism includes a condensation sleeve adapted to the volatile port, the condensation sleeve is detachably connected to the volatile port, a condensation chamber is provided in the condensation sleeve, a serpentine tube is fixedly provided in the condensation chamber, the bottom of the serpentine tube passes through the bottom wall of the condensation chamber and is connected to the volatile port, the top of the serpentine tube passes through the top wall of the condensation chamber and is connected to the outside, the top of the condensation sleeve is provided with a water outlet connected to the condensation chamber, and the bottom of the condensation sleeve is provided with a water inlet connected to the condensation chamber.

[0007] Furthermore, the clamping mechanism includes a connecting rod, a clamping member and a support frame fixedly arranged on the right side of the workbench, a slider is vertically slidably arranged on the support frame, a locking bolt is arranged on the slider for locking the position of the slider, one end of the connecting rod is fixedly connected to the slider, and the other end is fixedly connected to the clamping member, and the clamping member is used to clamp and fix the condensing sleeve.

[0008] Furthermore, the gas supply mechanism includes a ventilation hose, a gas connecting pipe and a nitrogen bottle fixedly arranged on the left side of the workbench, one end of the ventilation hose is connected to the gas outlet end of the nitrogen bottle, and the other end is provided with a gun head, the gas inlet end of the gas connecting pipe is adapted to the gun head, and the gas outlet end is adapted to the vent, the gas inlet end of the gas connecting pipe is detachably connected to the gun head, the gas outlet end of the gas connecting pipe is detachably connected to the vent, and the diameter of the gas inlet port of the gas connecting pipe is smaller than the diameter of the gas outlet port.

[0009] Furthermore, the heating mechanism comprises a water bath pot fixedly arranged in the middle of the workbench, a pot cover is arranged on the top of the water bath pot, and a circular opening is arranged in the middle of the pot cover for placing the three-necked flask.

[0010] Furthermore, the feeding port is detachably connected with a stopper.

[0011] The beneficial effects of the utility model are:

[0012] The utility model can meet various conditions such as heating, reflux and nitrogen protection required for the preparation of ionic liquids, has good preparation effect, and can chemically modify starch after the preparation is completed; during the heating process of preparing the ionic liquid, volatile components pass through the volatilization port and flow through the serpentine tube to the outside world. The arrangement of the serpentine tube prolongs the path of the volatile gas and increases the contact area with the condensed water, which not only maintains a non-sealed environment but also avoids excessive volatilization; by changing the position of the slider on the support frame, the clamping position of the clamping part on the condensation sleeve is changed to ensure the stability of the condensation sleeve; the air inlet end of the gas connecting tube is matched with the gun head, and the air outlet end is matched with the air vent to avoid air leakage; the air inlet port diameter of the gas connecting tube is smaller than the air outlet port diameter to avoid excessive gas flow and affect the preparation process of the ionic liquid in the three-necked flask; the water bath can heat ionic liquids of different proportions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0014] Figure 1 The utility model is a schematic diagram of the structure of a starch chemical modification device.

[0015] Figure 2 It is a top view of the water bath pot in the utility model.

[0016] Figure 3 It is a schematic structural diagram of a three-necked flask in the utility model.

[0017] Figure 4 It is a structural schematic diagram of the detachable gas connecting pipe in the utility model.

[0018] Among them, in the figure:

[0019] 1. Three-necked flask; 11. Vent; 12. Evaporation port; 13. Feeding port; 2. Workbench; 3. Water bath; 31. Pot cover; 311. Circular opening; 4. Support frame; 41. Slider; 42. Connecting rod; 43. Clamp; 5. Condenser sleeve; 51. Serpentine tube; 52. Water outlet; 53. Water inlet; 6. Nitrogen bottle; 61. Ventilation hose; 62. Gun tip; 7. Gas connecting pipe; 8. Stopper. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0023] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0024] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] See attached Figure 1-4 The utility model discloses a starch chemical modification device, comprising a three-necked flask 1, a workbench 2, and a gas supply mechanism, a heating mechanism and a clamping mechanism arranged on the workbench 2 in sequence. The bottom of the three-necked flask 1 is located in the heating mechanism, and the top of the three-necked flask 1 is provided with a vent 11, a volatilization port 12 and a feeding port 13 in sequence. The vent 11 is connected to the gas supply mechanism, and the volatilization port 12 is connected to a condensation reflux mechanism. The clamping mechanism is used to clamp and fix the condensation reflux mechanism. The three-necked flask 1 is used for preparing ionic liquid and starch chemical modification.

[0026] This embodiment can meet the various conditions required for the preparation of ionic liquids, such as heating, reflux, and nitrogen protection, and has a good preparation effect. After the preparation is completed, the starch can be chemically modified.

[0027] The condensation reflux mechanism includes a condensation sleeve 5 adapted to the volatilization port 12, the condensation sleeve 5 is detachably connected to the volatilization port 12, a condensation chamber is provided in the condensation sleeve 5, a serpentine tube 51 is fixedly provided in the condensation chamber, the bottom of the serpentine tube 51 passes through the bottom wall of the condensation chamber and is connected to the volatilization port 12, the top passes through the top wall of the condensation chamber and is connected to the outside, the top of the condensation sleeve 5 is provided with a water outlet 52 connected to the condensation chamber, and the bottom is provided with a water inlet 53 connected to the condensation chamber.

[0028] In this embodiment, condensed water enters the condensation chamber from the water inlet 53 and exits the condensation chamber from the water outlet 52 (in from the bottom and out from the top), forming a cycle. During the heating process of preparing the ionic liquid, the volatile components pass through the volatilization port 12 and flow through the serpentine tube 51 into the outside. The setting of the serpentine tube 51 extends the path of the volatile gas and increases the contact area with the condensed water, thereby maintaining a non-sealed environment and avoiding excessive volatilization.

[0029] The clamping mechanism includes a connecting rod 42, a clamping member 43 and a support frame 4 fixedly arranged on the right side of the workbench 2. A slider 41 is vertically slidably arranged on the support frame 4. A locking bolt is arranged on the slider 41 for locking the position of the slider 41. One end of the connecting rod 42 is fixedly connected to the slider 41, and the other end is fixedly connected to the clamping member 43. The clamping member 43 is used to clamp and fix the condensation sleeve 5.

[0030] In this embodiment, by changing the position of the slider 41 on the support frame 4 and changing the clamping position of the clamping member 43 on the condensing sleeve 5, the stability of the condensing sleeve 5 is ensured.

[0031] The gas supply mechanism includes a ventilation hose 61, a gas connecting pipe 7 and a nitrogen bottle 6 fixedly arranged on the left side of the workbench 2. One end of the ventilation hose 61 is connected to the gas outlet end of the nitrogen bottle 6, and the other end is provided with a gun head 62. The gas inlet end of the gas connecting pipe 7 is adapted to the gun head 62, and the gas outlet end is adapted to the vent 11. The gas inlet end of the gas connecting pipe 7 is detachably connected to the gun head 62, and the gas outlet end of the gas connecting pipe 7 is detachably connected to the vent 11. The diameter of the gas inlet port of the gas connecting pipe 7 is smaller than the diameter of the gas outlet port.

[0032] In this embodiment, the air inlet end of the gas connecting tube 7 is adapted to the gun head 62, and the air outlet end is adapted to the vent 11 to avoid air leakage. The diameter of the air inlet port of the gas connecting tube 7 is smaller than the diameter of the air outlet port to avoid excessive gas flow, which affects the preparation process of the ionic liquid in the three-necked flask 1.

[0033] The heating mechanism comprises a water bath pot 3 fixedly arranged in the middle of the workbench 2 , a pot cover 31 is arranged on the top of the water bath pot 3 , and a circular opening 31 is arranged in the middle of the pot cover 31 for placing the three-necked flask 1 .

[0034] In this embodiment, the water bath 3 can heat ionic liquids in different proportions.

[0035] The feed port 13 is detachably connected with a plug 8 .

[0036] In this embodiment, when adding materials, the plug 8 is taken out and added through the feeding port 13 . After the feeding is completed, the plug 8 is used to close the feeding port 13 .

[0037] Working principle of this utility model:

[0038] First, prepare the ionic liquid, add 2.20g of 3-propylamine hydrobromide and 25ml of anhydrous ethanol into the three-necked flask 1 through the feed port 13 and mix, then place the condensation sleeve 5 at the volatilization port 12 and connect it to the three-necked flask 1, place the three-necked flask 1 in a preheated water bath 3 (preset temperature 80°C), and clamp the condensation sleeve 5 with the clamp 43, then connect the water inlet and the water outlet of the condensation chamber to the condensed water (in from the bottom and out from the top) to form a cycle, place the gas connecting pipe 7 at the vent 11, place the gun head of the vent hose in the gas connecting pipe 7, open the nitrogen bottle 6, and introduce nitrogen into the three-necked flask 1, add 0.79ml of 1-methylimidazole after the temperature of the water bath 3 rises, reflux for 24h, and after completion, add ethyl acetate to the reaction product for recrystallization;

[0039] Pour out the crystals, accurately weigh about 1g of the original starch into a three-necked flask 1, and use a pipette to draw a mixed solution of water and ionic liquid. The mixed solution in the three-necked flask 1: starch ratio is 3: 1 (mass ratio). Add a rotor and stir gently to mix, then heat to the specified temperature, take out the starch sample, wash the starch sample with 25mL of anhydrous ethanol, stir and centrifuge at 6800×g for 15min to remove the ionic liquid. After repeating the above two washing processes, place it in a fume hood overnight to evaporate and remove the residual ethanol. Then add 3 times of deionized water to the obtained starch sample, grind it into powder after freeze drying, and pass through a 100-mesh sieve to obtain an ionic liquid modified starch sample.

[0040] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A starch chemical modification device, characterized in that: The invention comprises a three-necked flask (1), a workbench (2), and a gas supply mechanism, a heating mechanism and a clamping mechanism which are arranged on the workbench (2) in sequence. The bottom of the three-necked flask (1) is located in the heating mechanism. The top of the three-necked flask (1) is provided with a vent (11), a volatilization port (12) and a feeding port (13) in sequence. The vent (11) is connected to the gas supply mechanism. The volatilization port (12) is connected to a condensation reflux mechanism. The clamping mechanism is used to clamp and fix the condensation reflux mechanism. The three-necked flask (1) is used for preparing ionic liquids and chemically modifying starch.

2. A starch chemical modification device according to claim 1, characterized in that: The condensation reflux mechanism comprises a condensation sleeve (5) adapted to the evaporation port (12), the condensation sleeve (5) being detachably connected to the evaporation port (12), a condensation chamber being arranged in the condensation sleeve (5), a serpentine tube (51) being fixedly arranged in the condensation chamber, the bottom of the serpentine tube (51) passing through the bottom wall of the condensation chamber and being connected to the evaporation port (12), the top of the serpentine tube (51) passing through the top wall of the condensation chamber and being connected to the outside, the top of the condensation sleeve (5) being provided with a water outlet (52) connected to the condensation chamber, and the bottom of the condensation sleeve (5) being provided with a water inlet (53) connected to the condensation chamber.

3. A starch chemical modification device according to claim 2, characterized in that: The clamping mechanism comprises a connecting rod (42), a clamping member (43) and a support frame (4) fixedly arranged on the right side of the workbench (2); a slider (41) is vertically slidably arranged on the support frame (4); a locking bolt is arranged on the slider (41) for locking the position of the slider (41); one end of the connecting rod (42) is fixedly connected to the slider (41), and the other end is fixedly connected to the clamping member (43); the clamping member (43) is used to clamp and fix the condensing sleeve (5).

4. A starch chemical modification device according to claim 1, characterized in that: The gas supply mechanism comprises a ventilation hose (61), a gas connecting pipe (7) and a nitrogen bottle (6) fixedly arranged on the left side of the workbench (2); one end of the ventilation hose (61) is connected to the gas outlet end of the nitrogen bottle (6), and the other end is provided with a gun head (62); the gas inlet end of the gas connecting pipe (7) is matched with the gun head (62), and the gas outlet end is matched with the vent (11); the gas inlet end of the gas connecting pipe (7) is detachably connected to the gun head (62), and the gas outlet end of the gas connecting pipe (7) is detachably connected to the vent (11); the diameter of the gas inlet port of the gas connecting pipe (7) is smaller than the diameter of the gas outlet port.

5. A starch chemical modification device according to claim 1, characterized in that: The heating mechanism comprises a water bath pot (3) fixedly arranged in the middle of the workbench (2); a pot cover (31) is provided on the top of the water bath pot (3); a circular opening (311) is provided in the middle of the pot cover (31) for placing the three-necked flask (1).

6. A starch chemical modification device according to claim 1, characterized in that: The feed port (13) is detachably connected to a plug (8).

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