CN210944980U - Cationic starch grafted tannin preparation system - Google Patents

Abstract

The utility model discloses a cationic starch grafted tannin preparation system, which comprises a starch cationization part, a grafting part and a washing and drying part; the starch cationization part comprises a stirring tank, an alkali liquor storage tank and a first washing tank; the grafting part comprises a reaction tank, a tannin storage tank and an alcohol solution storage tank, the upper end and the bottom of the reaction tank are respectively provided with a feeding port and a discharging port, and the tannin storage tank and the alcohol solution storage tank are both connected with the reaction tank through a feeding pump; the washing and drying part comprises a settling tank, a settling liquid storage tank, a second washing tank and an oven, wherein the settling liquid storage tank is connected with the settling tank through a pipeline provided with a feed valve, an inlet of the settling tank is communicated with a discharge hole of the reaction tank, an inlet of the second washing tank is connected with an outlet of the settling tank, and the oven is arranged at the downstream of the second washing tank; the top of the first washing tank and the top of the second washing tank are both provided with spray heads, and the spray heads are connected with a washing liquid storage tank. By adopting the preparation system with the structure, the problem of low production efficiency of the starch graft copolymer can be effectively solved.

Description

Cationic starch grafted tannin preparation system

Technical Field

The utility model belongs to the technical field of chemical industry equipment, concretely relates to cationic starch grafting tannin preparation system.

Background

At present, the resource and environment pressure is increasing, and microalgae is a novel renewable green material to be noted. However, harvesting of microalgae is one of the key problems restricting the development of microalgae industry, and according to statistics of relevant data, the harvesting cost of microalgae accounts for more than 30% of the production cost of microalgae.

The current method for harvesting microalgae mainly comprises centrifugation, gravity settling, filtration, air floatation, adsorption, pH induction, flocculation and the like. Wherein, the flocculation has the advantages of low cost, convenient operation, small dependence on equipment and the like and is widely used for harvesting the microalgae. In the flocculation process, single microalgae cells are aggregated into large flocs through charge neutralization, bridging flocculation and net capture, so that the microalgae cells are separated from a culture medium in a short time. Flocculants commonly used for harvesting microalgae can be divided into inorganic flocculants and organic flocculants, and the selection of the flocculants is the key to flocculating the harvested microalgae. The common inorganic flocculating agents, such as aluminum salt, iron salt and polymers thereof, have the inevitable problem of metal ion residue and the like, and have adverse effect on the subsequent processing and utilization of the microalgae. Organic flocculants, such as petrochemical derivatives such as polyacrylamide, are relatively expensive and non-renewable, and on the other hand, monomers or degradation products thereof often have strong biological toxicity. Therefore, the selection of the biomass-based flocculant for harvesting microalgae is the key point of future research.

The starch is a biomass-based high molecular compound with wide source and low price, has good flocculation potential, and is one of the excellent raw materials for preparing the biomass-based flocculant at present. Since starch is an anionic material and lacks an effective charge neutralizing capacity, it is often cationized (cationic starch) in the current preparation of starch-based flocculants. The cationic starch has the advantages of environmental protection, recycling of culture medium, small influence on microalgae processing and the like, and shows attractive prospect in the field of microalgae harvesting. However, cationic starch tends to require larger amounts for harvesting microalgae and harvesting efficiency is low. Therefore, it is a challenge to improve the microalgae harvesting performance of cationic starch.

The grafting treatment of the cationic starch is an effective means for improving the harvesting rate of the starch to microalgae, but the existing starch graft copolymer preparation system has the defects of low production efficiency, high energy consumption, long production time and the like, and the industrial production and application of the starch graft copolymer are seriously influenced.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned prior art, the utility model provides a cationic starch-tannin graft copolymer preparation system to solve the problem that starch graft copolymer production efficiency is low.

In order to achieve the above purpose, the utility model adopts the technical scheme that: providing a cationic starch-tannin graft copolymer preparation system, which comprises a starch cationization part, a grafting part and a washing and drying part; the starch cationization part comprises a stirring tank, an alkali liquor storage tank and a first washing tank, wherein the alkali liquor storage tank is connected with the stirring tank through a material conveying pump and a material conveying pipe, a stirrer is arranged inside the stirring tank, a heater is arranged on the side wall of the stirring tank, and an inlet of the first washing tank is connected with an outlet of the stirring tank; the grafting part comprises a reaction tank, a tannin storage tank and an alcohol solution storage tank, the upper end of the reaction tank is provided with a feed opening, the bottom of the reaction tank is provided with a discharge opening, and the tannin storage tank and the alcohol solution storage tank are respectively connected with the reaction tank through feed pumps; the washing and drying part comprises a settling tank, a settling liquid storage tank, a second washing tank and an oven, wherein the settling liquid storage tank is connected with the settling tank through a pipeline provided with a feed valve, an inlet of the settling tank is communicated with a discharge hole of the reaction tank, an inlet of the second washing tank is connected with a discharge hole of the settling tank, and the oven is arranged at the downstream of the second washing tank; the top of the first washing tank and the top of the second washing tank are both provided with spray heads, and the spray heads are connected with a washing liquid storage tank.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the agitator includes agitator motor and (mixing) shaft, and agitator motor is fixed in the top of agitator tank, and (mixing) shaft and agitator motor fixed connection are provided with 2 ~ 3 stirring rakes on the (mixing) shaft.

Further, the heater is an electric heating belt, and the electric heating belt is wound on the side wall of the stirring tank in a spiral winding mode.

Furthermore, a spray head is arranged at one end of the conveying pipe connected with the stirring tank, and the spray head is positioned at the top of the stirring tank.

Further, a drying box and a powdering machine are arranged between the starch cationization part and the grafting part.

The utility model has the advantages that:

1. the preparation system in the utility model is a continuous preparation system, the starch treatment, the grafting and the like are continuously carried out, the preparation efficiency of the graft copolymer can be obviously improved, and the preparation method is suitable for large-scale industrial production.

2. The preparation system in the utility model is divided into a plurality of functional parts, and each functional part is responsible for its own duties but is the intercourse, when guaranteeing safety, machining efficiency improves greatly.

Drawings

FIG. 1 is a schematic view of the connection of the components of the preparation system of the present invention;

FIG. 2 is a cross-sectional view of a blender jar;

wherein, 1, a starch cationization part; 11. a stirring tank; 12. a first wash tank; 13. an alkali liquor storage tank; 14. a delivery pump; 15. a delivery pipe; 16. a stirrer; 161. a stirring motor; 162. a stirring shaft; 163. a stirring paddle; 17. a heater;

2. a grafting section; 21. a reaction tank; 22. a feeding port; 23. a discharging port; 24. a tannin storage tank; 25. an alcohol liquid storage tank; 26. a feed pump;

3. a washing and drying section; 31. a settling tank; 32. a second wash tank; 33. an oven; 34. a storage tank for the precipitation solution;

4. a shower head; 5. and a washing liquid storage tank.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

The embodiment of the utility model provides an in the embodiment, as shown in fig. 1 ~ 2, provide a cationic starch-tannin graft copolymer preparation system, the preparation system in the utility model includes starch cationization portion 1, grafting portion 2 and washing drying portion 3, wherein, starch cationization portion 1 is used for carrying out cationization to starch and handles, and grafting portion 2 is used for starch graft tannin after the cationization, and washing drying portion 3 is used for washing and drying the starch-tannin copolymer after the grafting.

As shown in fig. 1, the starch cationization part 1 includes an agitator tank 11, an alkali liquor storage tank 13 and a first washing tank 12, the alkali liquor storage tank 13 contains sodium hydroxide solution with a concentration of about 2%, the alkali liquor storage tank 13 is connected with the agitator tank 11 through a material conveying pump 14 and a material conveying pipe 15, an agitator 16 is arranged inside the agitator tank 11, a heater 17 is arranged on the side wall, the agitator 16 is used for agitating starch in the agitator tank 11, in order to improve the agitating efficiency and the mixing effect, the agitator 16 in the utility model is specially designed and includes an agitator motor 161 and an agitator shaft 162, the agitator motor 161 is fixed on the top of the agitator tank 11, the agitator shaft 162 is fixedly connected with the agitator motor 161, and 2-3 groups of agitator paddles 163 are arranged on the agitator shaft 162; the heater 17 is used for heating and keeping the temperature of the stirring tank 11, and may be a steam heater, a water heater, etc., but for convenience of handling and safety, the heater 17 in the present invention is preferably an electric heating tape, and the electric heating tape is wound on the side wall of the stirring tank 11 in a spiral winding manner. In order to make alkali lye and starch mix more evenly, the one end that is connected at conveying pipeline 15 and agitator tank 11 in this practicality is provided with the shower nozzle, and the shower nozzle is located the top of agitator tank 11, and alkali lye is in the mode that sprays adds starch. The import of first washing tank 12 is connected with the export of agitator tank 11, and the stirring reaction is accomplished the back, and the stirring result in the agitator tank 11 gets into and washes in first washing tank 12, and for the washing more abundant, the top of first washing tank 12 is provided with shower head 4, and shower head 4 is connected with washing liquid storage tank 5, and the splendid attire has the ethanol solution that concentration is 80% in the washing liquid storage tank 5 that matches with first washing tank 12.

When the cationization treatment is carried out on the starch, firstly, 100 parts by mass of the starch is put into the stirring tank 11 through a feeding port of the stirring tank 11, then 30 parts by mass of a sodium hydroxide solution is added into the stirring tank 11 through an alkali liquor storage tank 13, then 20 parts by mass of 2, 3-epoxypropyltrimethylammonium chloride is added into the stirring tank 11 through the feeding port, a stirrer 16 is started, the substances in the stirring tank 11 are uniformly mixed, then a heater 17 is started, the temperature of the stirring tank is controlled to be 65-70 ℃, the reaction is carried out for 5-8 hours at the temperature, then the reaction product is led into a first washing tank 12, and the washing solution is sprayed through a washing solution storage tank 5 to wash the reaction product, so that the cationized starch is obtained.

For convenient storage and feeding, the cationized starch can be dried and ground. Therefore, a drying oven and a powdering machine are provided between the starch cationizing unit 1 and the graft unit 2, and the product discharged from the first washing tank 12 is passed through the drying oven and the powdering machine in this order to obtain powdery cationic starch.

As shown in fig. 1, the graft portion 2 includes a reaction tank 21, a tannin tank 24, and an alcohol solution tank 25. Wherein, the upper end of the reaction tank 21 is provided with a feeding port 22, the bottom of the reaction tank is provided with a discharging port 23, a tannin storage tank 24 and an alcohol solution storage tank 25 are respectively connected with the reaction tank 21 through a feeding pump 26, the tannin storage tank 24 is filled with tannin water solution with the mass concentration of 0.4% -4%, and the alcohol solution storage tank 25 is filled with absolute ethyl alcohol.

When the cationized starch is subjected to tannin grafting, 1 part by mass of the cationic starch is put into a reaction tank 21 through a feeding port 22, and 20-30 parts by mass of distilled water are added to fully dissolve the cationic starch to form an ionic starch suspension; adding 0.05-0.1 part of vitamin C and 1 part of hydrogen peroxide into the cationic starch suspension through a feeding port 22, reacting for 30-40 min at room temperature, then supplementing 10 parts of absolute ethyl alcohol, dropwise adding 25-30 parts of tannin water solution, and reacting for 20-24 h at room temperature to obtain a grafting primary product.

As shown in fig. 1, the washing and drying section 3 includes a precipitation tank 31, a precipitation liquid storage tank 34, a second washing tank 32, and an oven 33. The acetone is contained in the precipitation liquid storage tank 34 and is connected with the precipitation tank 31 through a pipeline provided with a feed valve, and the inlet of the precipitation tank 31 is communicated with the discharge port 23 of the reaction tank 21; the import of second washing tank 32 is connected with the export of gunbarrel 31, and the back is accomplished in the sediment, and the deposit result in the gunbarrel 31 gets into second washing tank 32 and washes, and for the washing more abundant, the top of second washing tank 32 is provided with shower head 4, and shower head 4 is connected with washing liquid storage tank 5, and the washing liquid storage tank 5 that matches with second washing tank 12 is splendid attire with anhydrous alcohol.

When the grafting primary product is washed, the grafting primary product is placed into the precipitation tank 31 through the discharge port 23, then acetone is added into the precipitation tank 31 through the precipitation liquid storage tank 34 to submerge the grafting primary product, the precipitate is introduced into the second washing tank 32 after 4-6 hours, the precipitate is washed by absolute ethyl alcohol, and then the washed product is introduced into the oven 33 and dried to obtain the cationic starch-tannin graft copolymer. The copolymer is mainly used as a flocculating agent for harvesting microalgae.

While the present invention has been described in detail and with reference to the accompanying drawings, it is not to be considered as limited to the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.

Claims (5)

1. A cationic starch grafted tannin preparation system is characterized in that: comprises a starch cationization part (1), a grafting part (2) and a washing and drying part (3); the starch cationization part (1) comprises a stirring tank (11), an alkali liquor storage tank (13) and a first washing tank (12), wherein the alkali liquor storage tank (13) is connected with the stirring tank (11) through a conveying pump (14) and a conveying pipe (15), a stirrer (16) is arranged inside the stirring tank (11), a heater (17) is arranged on the side wall of the stirring tank (11), and an inlet of the first washing tank (12) is connected with an outlet of the stirring tank (11); the grafting part (2) comprises a reaction tank (21), a tannin storage tank (24) and an alcohol solution storage tank (25), the upper end of the reaction tank (21) is provided with a feeding port (22), the bottom of the reaction tank is provided with a discharging port (23), and the tannin storage tank (24) and the alcohol solution storage tank (25) are respectively connected with the reaction tank (21) through a feeding pump (26); the washing and drying part (3) comprises a settling tank (31), a settling liquid storage tank (34), a second washing tank (32) and an oven (33), wherein the settling liquid storage tank (34) is connected with the settling tank (31) through a pipeline provided with a feed valve, an inlet of the settling tank (31) is communicated with a discharge port (23) of the reaction tank (21), an inlet of the second washing tank (32) is connected with an outlet of the settling tank (31), and the oven (33) is arranged at the downstream of the second washing tank (32); the top of the first washing tank (12) and the top of the second washing tank (32) are both provided with a spray header (4), and the spray headers (4) are connected with a washing liquid storage tank (5).

2. The cationic starch grafted tannin preparation system of claim 1, wherein: the stirrer (16) comprises a stirring motor (161) and a stirring shaft (162), wherein the stirring motor (161) is fixed at the top of the stirring tank (11), the stirring shaft (162) is fixedly connected with the stirring motor (161), and 2-3 groups of stirring paddles (163) are arranged on the stirring shaft (162).

3. The cationic starch grafted tannin preparation system of claim 1, wherein: the heater (17) is an electric heating belt which is wound on the side wall of the stirring tank (11) in a spiral winding mode.

4. The cationic starch grafted tannin preparation system of claim 1, wherein: and a spray head is arranged at one end of the conveying pipe (15) connected with the stirring tank (11), and the spray head is positioned at the top of the stirring tank (11).

5. The cationic starch grafted tannin preparation system of claim 1, wherein: a drying box and a powdering machine are arranged between the starch cationization part (1) and the grafting part (2).

Images