Membrane separation device for solvent-free production of low-salt amino acid surfactant

Abstract

The utility model relates to the technical field of chemical engineering, and discloses a membrane separation device for solvent-free production of a low-salt amino acid surfactant, which comprises an amidation reaction tank, and is characterized in that the inner bottom wall of the amidation reaction tank is rotationally connected with a rotating rod through a sealing bearing. According to the membrane separation device for solvent-free production of the low-salt amino acid surfactant, through the cooperation of the amidation reaction tank and the membrane separation tank, an amidation product can pass through the membrane filtration device under a certain pressure condition, small molecular substances such as water and inorganic salt pass through a filter membrane to become permeate, the product realizes desalination, and the product quality is improved. Extra chemical reagents do not need to be added in the membrane separation process, environmental pollution and energy consumption are reduced, the concept of green chemistry is met, corrosivity of amidation products obtained after desalination to follow-up treatment equipment is reduced, the service life of the equipment is prolonged, and the maintenance and replacement cost of the equipment is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical industry, in particular to a membrane separation device for solvent-free production of low-salt amino acid surfactant. BACKGROUND

[0002] Chemical industry, namely chemical industry, is a department that uses chemical methods and principles to study, manufacture and apply chemical products and chemical industry technology, which covers the production of basic chemical raw materials to various fine chemicals, as well as related processes, equipment, design, research and development and services.

[0003] Amino acid surfactant is a new type of green and environmentally friendly surfactant from renewable biomass, which is widely used in high-end daily chemical field due to its excellent low irritation, low toxicity, good biodegradability and good affinity to human body. The synthesis process of traditional amino acid surfactant generally adopts acyl chloride method through Schotten-Baumann amidation reaction, and organic solvent is generally added for post-treatment. A large amount of inorganic acid is acidified at high temperature to separate the water layer and remove inorganic salt. The organic phase is distilled under reduced pressure to remove the organic solvent to obtain the fatty amido acid oil layer. Then, the salt-free amino acid surfactant product is prepared by adding base and neutralizing.

[0004] The method generally relies on a series of organic solvents for separation and purification of subsequent products, such as tetrahydrofuran, ethanol, isopropanol and acetone. The organic solvents used in the process often have certain toxicity. Even if they are removed by methods such as reduced pressure in the subsequent treatment process, it is still difficult to ensure that there is no solvent residue in the final product. CONTENT OF THE UTILITY MODEL

[0005] In view of the defects of the prior art, the application provides a membrane separation device for solvent-free production of low-salt amino acid surfactant, which has the advantages of improving practicality and solving the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme: a membrane separation device for solvent-free production of low-salt amino acid surfactant, comprising an amidation reaction tank, characterized in that: the inner bottom wall of the amidation reaction tank is rotationally connected with a rotating rod through a sealing bearing, the outer surface of the rotating rod is fixedly connected with a plurality of stirring plates, the ends of the plurality of stirring plates away from each other are fixedly connected with scrapers, a membrane separation tank and a material concentration tank are arranged on the right side of the amidation reaction tank, a heating element is installed on the outer surface of the amidation reaction tank, a sealing cover one is arranged on the upper surface of the reaction tank, a booster pump is installed on the upper surface of the sealing cover one, and a pressure sensor and a temperature sensor are installed on the inner top wall of the sealing cover one.

[0007] Through the above scheme, by installing the amidation reaction tank and the membrane separation tank, the amidation product can be filtered through the membrane filter device under certain pressure conditions, and the water and small molecular substances such as inorganic salts become the permeate, and the product is desalted.

[0008] The right side of the amidation reaction tank is provided with a finished product tank, a sealing cover two is installed on the upper surface of the finished product tank, sealing rings are installed on the upper surfaces of the amidation reaction tank and the finished product tank, the two sealing rings are in contact with the sealing cover one and the sealing cover two close to them, the installation of the sealing ring can improve the sealing performance of the amidation reaction tank, so that the internal materials can stably react, and the sealing ring can adapt to the pressure and temperature of the reaction tank in different working environments, maintain good sealing performance within the specified range, and has the ability of automatic compensation, which can automatically improve the sealing performance with the increase of pressure, so as to ensure that the medium in the reaction tank will not leak.

[0009] The bottom of the amidation reaction tank is provided with a servo motor, the output end of the servo motor is fixedly connected with the bottom end of the rotating rod, and the bottom end of the rotating rod is fixedly connected with the bottom end of the rotating rod.

[0010] The right side of the amidation reaction tank is provided with an extraction pump one, the input end of the extraction pump is fixedly communicated with an input pipe one, the input pipe one is fixedly communicated with the bottom end of the amidation reaction tank, and the output end of the extraction pump one is communicated with the input end of the membrane separation tank through a pipeline.

[0011] The right side of the membrane separation tank is provided with an extraction pump two, the input end of the extraction pump two is fixedly communicated with an input pipe two, the output end of the input pipe two is fixedly communicated with the bottom end of the material concentration tank, and the output end of the extraction pump two is fixedly communicated with the upper surface of the sealing cover two through a pipeline.

[0012] The outer surfaces of the input pipe one and the input pipe two are both provided with a valve one, the installation of the valve one can close the input pipe one and the input pipe two, avoid the unprocessed reaction entering the input pipe one, and maintain the sealing performance of the amidation reaction tank and the material concentration tank.

[0013] The communication pipe is fixedly connected between the membrane separation tank and the material concentration tank, and a valve two is installed on the outer surface of the communication pipe, so that the communication pipe can be closed, the unfinished material in the membrane separation tank is prevented from entering the material concentration tank through the communication pipe, and the membrane separation tank can be kept in a sealed state during operation.

[0014] The outer surface of the sealing cover one is fixedly connected with a feeding pipe, the bottom end of the finished product tank is fixedly connected with a discharging pipe, and sealing valves are installed on the outer surfaces of the feeding pipe and the discharging pipe, so that the amidation reaction tank and the finished product tank can be closed, and leakage or influence on the storage of reactants during the reaction of the reactants is avoided.

[0015] Compared with the prior art, the technical scheme has the following beneficial effects:

[0016] The membrane separation device for solvent-free production of low-salt amino acid surfactants can realize desalination of the product by installing the amidation reaction tank and the membrane separation tank in cooperation under certain pressure conditions, so that the amidation product passes through the membrane filtration device, water and inorganic salt and other small molecule substances become permeate through the filter membrane, the membrane separation process does not need to add additional chemical reagents, environmental pollution and energy consumption are reduced, the concept of green chemistry is met, the corrosion of the amidation product after desalination to the subsequent treatment equipment is reduced, the service life of the equipment is prolonged, and the cost of equipment maintenance and replacement is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a sectional view of the overall structure of the application Figure 1 ;

[0018] Figure 2 It is an enlarged schematic view of the structure at A of the application Figure 1 .

[0019] Figure 3 It is an enlarged schematic view of the structure at B of the application Figure 1 .

[0020] Figure 4 It is a schematic view of the overall structure of the application

[0021] Figure 5 It is a sectional view of the overall structure of the application Figure 2 .

[0022] In the drawings:

[0023] 1, amidation reaction tank; 2, rotating rod; 3, stirring plate; 4, scraper; 5, membrane separation tank; 6, material concentration tank; 7, heating element; 8, sealing cover one; 9, booster pump; 10, pressure sensor; 11, temperature sensor; 12, finished product tank; 13, sealing cover two; 14, sealing ring; 15, servo motor; 16, sealing element; 17, extraction pump one; 18, input pipe one; 19, extraction pump two; 20, input pipe two; 21, valve one; 22, communication pipe; 23, valve two; 24, feed pipe; 25, discharge pipe; 26, sealing valve. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] Please refer to Figure 1 , Figure 2 and Figure 3 , a membrane separation device for producing low-salt amino acid surfactant without solvent in the embodiment includes an amidation reaction tank 1, a rotating rod 2 is rotatably connected to the inner bottom wall of the amidation reaction tank 1 through a sealing bearing, a plurality of stirring plates 3 are fixedly connected to the outer surface of the rotating rod 2, a scraper 4 is fixedly connected to the end of each of the plurality of stirring plates 3 away from each other, a membrane separation tank 5 and a material concentration tank 6 are arranged on the right side of the amidation reaction tank 1, a heating element 7 is installed on the outer surface of the amidation reaction tank 1, a sealing cover one 8 is arranged on the upper surface of the reaction tank, a booster pump 9 is installed on the upper surface of the sealing cover one 8, a pressure sensor 10 and a temperature sensor 11 are installed on the inner top wall of the sealing cover one 8, the membrane separation tank 5 is selected from a microfiltration membrane, an ultrafiltration membrane, a nanofiltration membrane or a combination thereof; the material concentration tank 6 is selected from a microfiltration membrane, an ultrafiltration membrane, a nanofiltration membrane, a RO reverse osmosis membrane or a combination thereof, through the cooperation of the amidation reaction tank 1 and the membrane separation tank 5, the amidation product can pass through the membrane filtration device under certain pressure conditions, water and small molecular substances such as inorganic salts become the permeate through the filter membrane, the product realizes desalination, the membrane separation process does not need to add additional chemical reagents, reduces environmental pollution and energy consumption, conforms to the concept of green chemistry, the corrosion of the amidation product after desalination to the subsequent treatment equipment is reduced, which helps to prolong the service life of the equipment and reduce the cost of equipment maintenance and replacement.

[0026] Please refer to Figure 1 , Figure 3 and Figure 4The right side of the amidation reaction tank 1 is provided with a finished product tank 12, the upper surface of the finished product tank 12 is provided with a sealing cover two 13, the upper surfaces of the amidation reaction tank 1 and the finished product tank 12 are provided with sealing rings 14, the two sealing rings 14 are in contact with the sealing cover one 8 and the sealing cover two 13 close to the sealing rings 14, the sealing rings 14 can improve the sealing performance of the amidation reaction tank 1, so that the internal materials can stably react, and the sealing rings 14 can adapt to the pressure and temperature of the reaction tank in different working environments, maintain good sealing performance within a specified range, the sealing rings 14 have the ability of automatic compensation, and can automatically improve the sealing performance with the increase of pressure, so as to ensure that the internal medium of the reaction tank will not leak, the lower side of the amidation reaction tank 1 is provided with a servo motor 15, the output end of the servo motor 15 is fixedly connected with the bottom end of the rotating rod 2, the bottom end of the rotating rod 2 is provided with a sealing piece 16, the sealing piece 16 is in contact with the bottom end of the rotating rod 2, the servo motor 15 can drive the rotating rod 2 to rotate, so that the rotating rod 2 can stir the reactants in the amidation reaction tank 1 through the plurality of stirring plates 3, so that the internal reactants can be uniformly mixed and reacted in the amidation reaction tank 1, the right side of the amidation reaction tank 1 is provided with a pumping pump one 17, the input end of the pumping pump one 17 is fixedly communicated with an input pipe one 18, the input pipe one 18 is fixedly communicated with the bottom end of the amidation reaction tank 1, the output end of the pumping pump one 17 is communicated with the input end of the membrane separation tank 5 through a pipeline, the installation of the input pipe one 18 can enable the pumping pump one to pump the reactants in the amidation reaction tank 1 to the membrane separation tank 5 after the reactants in the amidation reaction tank 1 are reacted, and the reactants are subjected to membrane separation work through the microfiltration membrane, the ultrafiltration membrane and the nanofiltration membrane.

[0027] Please refer to Figure 1 , Figure 4 and Figure 5The right side of the membrane separation tank 5 is provided with a pumping pump two 19, the input end of the pumping pump two 19 is fixedly communicated with an input pipe two 20, the output end of the input pipe two 20 is fixedly communicated with the bottom end of the material concentration tank 6, the output end of the pumping pump two 19 is fixedly communicated with the upper surface of the sealing cover two 13 through a pipeline, the pumping pump two 19 can pump the material in the material concentration tank 6 and deliver it into the finished product tank 12, so as to store the finished product and collect the finished product uniformly, the outer surfaces of the input pipe one 18 and the input pipe two 20 are both provided with a valve one 21, the installation of the valve one 21 can close the input pipe one 18 and the input pipe two 20, avoid the unprocessed reactant from entering the input pipe one 18, and maintain the sealing property of the amidation reaction tank 1 and the material concentration tank 6, a communication pipe 22 is fixedly communicated between the membrane separation tank 5 and the material concentration tank 6, a valve two 23 is installed on the outer surface of the communication pipe 22, the installation of the valve two 23 can close the communication pipe 22, avoid the unprocessed material in the membrane separation tank 5 from entering the material concentration pipe through the communication pipe 22, and maintain the sealing state of the membrane separation tank 5 during working, a feeding pipe 24 is fixedly communicated with the outer surface of the sealing cover one 8, a discharging pipe 25 is fixedly communicated with the bottom end of the finished product tank 12, sealing valves 26 are installed on the outer surfaces of the feeding pipe 24 and the discharging pipe 25, the installation of the sealing valves 26 can close the amidation reaction tank 1 and the finished product tank 12, avoid leakage during the reaction of the reactant or affect the storage of the reactant.

[0028] The membrane separation device for producing low-salt amino acid surfactant without solvent in the embodiment can realize desalination of the amidation product through the membrane filtration device under certain pressure conditions, the water and inorganic salt and other small molecule substances become the permeate liquid by the filter membrane, the membrane separation process does not need to add additional chemical reagent, reduces environmental pollution and energy consumption, meets the concept of green chemistry, the corrosion of the amidation product after desalination to the subsequent processing equipment is reduced, which is helpful to prolong the service life of the equipment and reduce the cost of equipment maintenance and replacement.

[0029] The working principle of the above embodiment is that: first, the amino acid salt, acyl chloride and liquid alkali are input into the amidation reaction module in a certain proportion, and the amidation reaction is carried out under appropriate temperature and pressure. The pressure in the amidation reaction tank 1 can be adjusted by installing a booster pump 9, and the temperature in the amidation reaction tank 1 can be controlled by cooperating with the heating part 7. The pressure in the amidation reaction tank 1 can be accurately monitored by cooperating with the pressure sensor 10 and the temperature sensor 11. Then the servo motor 15 starts and drives the rotating rod 2 to rotate, so that the rotating rod 2 can drive the multiple stirring plates 3 to stir the reactants in the amidation reaction tank 1, so that they can be fully mixed, and the scraper 4 can clean the inner wall of the amidation reaction tank 1 during stirring of the reactants, so as to avoid that the reactants adhere to the inner wall of the amidation reaction tank 1. When the reactants are reacted, the extraction pump one 17 extracts the reactants into the membrane separation tank 5 through the input pipe one 18. The cooperation of the microfiltration membrane, the ultrafiltration membrane and the nanofiltration membrane can realize membrane separation. Then the material enters the material concentration equipment through the communication pipe 22. After concentration, the extraction pump two 19 can transport the material to the finished product tank 12 through the input pipe two 20 for storage. The amidation product passes through the membrane filtration device, and the small molecular substances such as water and inorganic salt become the permeate liquid through the filter membrane, and the product realizes desalination. The membrane separation process does not need to add additional chemical reagents, reduces environmental pollution and energy consumption, meets the concept of green chemistry, the corrosion of the amidation product after desalination to the subsequent treatment equipment is reduced, which helps to prolong the service life of the equipment, reduces the cost of equipment maintenance and replacement, and improves the overall practicability.

[0030] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0031] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A membrane separation device for solvent-free production of low-salt amino acid surfactants, comprising an amidation reaction tank (1), characterized in that: The inner bottom wall of the amidation reaction tank (1) is rotatably connected with a rotating rod (2) through a sealing bearing, the outer surface of the rotating rod (2) is fixedly connected with a plurality of stirring plates (3), the ends of the plurality of stirring plates (3) away from each other are fixedly connected with scrapers (4), the right side of the amidation reaction tank (1) is provided with a membrane separation tank (5) and a material concentration tank (6), the outer surface of the amidation reaction tank (1) is provided with a heating element (7), the upper surface of the reaction tank is provided with a sealing cover (8), the upper surface of the sealing cover (8) is provided with a booster pump (9), the inner top wall of the sealing cover (8) is provided with a pressure sensor (10) and a temperature sensor (11).

2. A membrane separation device for solvent-free production of low-salt amino acid surfactants according to claim 1, characterized in that: The right side of the amidation reaction tank (1) is provided with a finished product tank (12), the upper surface of the finished product tank (12) is provided with a sealing cover (13), the upper surfaces of the amidation reaction tank (1) and the finished product tank (12) are provided with sealing rings (14), and the two sealing rings (14) are in contact with the sealing cover (8) and the sealing cover (13) close thereto.

3. A membrane separation device for solvent-free production of low-salt amino acid surfactants according to claim 1, characterized in that: The lower side of the amidation reaction tank (1) is provided with a servo motor (15), the output end of the servo motor (15) is fixedly connected with the bottom end of the rotating rod (2), and the bottom end of the amidation reaction tank (1) is provided with a sealing element (16) in contact with the bottom end of the rotating rod (2).

4. The membrane separation device for solvent-free production of low-salt amino acid surfactants according to claim 1, characterized in that: The right side of the amidation reaction tank (1) is provided with a pumping pump (17), the input end of the pumping pump is fixedly communicated with an input pipe (18), the input pipe (18) is fixedly communicated with the bottom end of the amidation reaction tank (1), and the output end of the pumping pump (17) is communicated with the input end of the membrane separation tank (5) through a pipeline.

5. A membrane separation device for solvent-free production of low-salt amino acid surfactants according to claim 1, characterized in that: The right side of the membrane separation tank (5) is provided with a pumping pump (19), the input end of the pumping pump (19) is fixedly communicated with an input pipe (20), the output end of the input pipe (20) is fixedly communicated with the bottom end of the material concentration tank (6), and the output end of the pumping pump (19) is fixedly communicated with the upper surface of the sealing cover (13) through a pipeline.

6. A membrane separation device for solvent-free production of low-salt amino acid surfactants according to claim 4, characterized in that: The outer surfaces of the input pipe (18) and the input pipe (20) are provided with a valve (21).

7. The membrane separation device for solvent-free production of low-salt amino acid surfactants according to claim 1, characterized in that: The membrane separation tank (5) and the material concentration tank (6) are fixedly communicated with a communication pipe (22), and the outer surface of the communication pipe (22) is provided with a valve (23).

8. The membrane separation device for solvent-free production of low-salt amino acid surfactants according to claim 1, characterized in that: The outer surfaces of the input pipe (24) and the discharge pipe (25) are provided with a sealing valve (26).

Images