Sodium sarcosinate continuous condensation reaction system

Abstract

The utility model provides a sodium sarcosinate continuous condensation reaction system which is characterized in that a condensation kettle is communicated with a first feeding pipe and a second feeding pipe and is used for enabling glycolonitrile and monomethylamine which respectively enter the condensation kettle from the first feeding pipe and the second feeding pipe to be subjected to condensation reaction to generate a methylaminoacetonitrile solution; the hydrolysis kettle is communicated with the condensation kettle through a condensation pipe, is communicated with an alkali liquor pipe and an ammonia gas pipe and is used for enabling a methylaminoacetonitrile solution and a sodium hydroxide solution which respectively enter the hydrolysis kettle from the condensation pipe and the alkali liquor pipe to generate a hydrolysis reaction to generate a sodium sarcosinate solution; the evaporation kettle is communicated with the hydrolysis kettle through a hydrolysis pipe and is communicated with a steam pipe, and the evaporation kettle is used for evaporating a sodium sarcosinate solution entering the evaporation kettle from the hydrolysis pipe through high-temperature steam entering the evaporation kettle from the steam pipe so as to obtain sodium sarcosinate with a preset concentration; and the control device is used for controlling reaction conditions in the condensation kettle and the hydrolysis kettle. According to the method, the concentration and the purity of the sodium sarcosine are improved, so that the prepared sodium sarcosine solution meets the actual production requirements.

Description

Technical Field

[0001] This application relates to the field of sodium sarcosinate synthesis technology, and in particular to a sodium sarcosinate continuous condensation reaction system. Background Technology

[0002] Sodium sarcosinate, also known as sodium N-methylaminoacetate or sodium N-methylglycine, is a major raw material for preparing fatty acyl sarcosine anionic surfactants. It can be used in personal care products such as shampoos, toothpaste, and shower gels, and can also be used to prepare creatine, a sports nutrition agent with health benefits, anti-aging properties, and treatment for heart disease. Because sodium sarcosinate is a non-irritating and easily biodegradable product, it is integral to daily life, resulting in high market demand. There are three methods for preparing sodium sarcosinate: one is the chloroacetic acid method, where chloroacetic acid reacts with monomethylamine in the presence of sodium hydroxide; another is the hydroxyacetonitrile method, also known as the hydrogen cyanide method; and the third is the condensation reaction of hydrogen cyanide with formaldehyde or directly with monomethylamine, followed by hydrolysis under alkaline conditions to prepare sodium sarcosinate.

[0003] Currently, sodium sarcosinate is mainly produced using the hydroxyacetonitrile method. Specifically, a certain proportion of hydroxyacetonitrile and monomethylamine are condensed together, and the resulting condensate is hydrolyzed under alkaline conditions to obtain sodium sarcosinate. However, the sodium sarcosinate obtained by hydrolysis contains water and ammonia, resulting in a low concentration and purity, which makes it difficult to meet the actual needs of use. Utility Model Content

[0004] This application provides a sodium sarcosinate continuous condensation reaction system to solve the technical problems described in the background art above.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] This application provides a sodium sarcosinate continuous condensation reaction system, comprising:

[0007] A condensation vessel, wherein a first feeding pipe and a second feeding pipe are connected to the condensation vessel, for causing hydroxyacetonitrile and monomethylamine, which enter the vessel from the first feeding pipe and the second feeding pipe respectively, to undergo a condensation reaction to generate a methylaminoacetonitrile solution;

[0008] A hydrolysis vessel, wherein the hydrolysis vessel is connected to the condensation vessel via a condensation tube and is connected to an alkaline solution tube and an ammonia gas tube, for hydrolyzing the methylaminoacetonitrile solution and sodium hydroxide solution that enter the vessel from the condensation tube and the alkaline solution tube respectively to generate sodium sarcosinate solution;

[0009] an evaporation kettle, which is communicated with the hydrolysis kettle through a hydrolysis pipe and has a steam pipe communicated therewith, for evaporating the sodium sarcosinate solution entering into it from the hydrolysis pipe through high-temperature steam entering into it from the steam pipe to obtain sodium sarcosinate of a preset concentration;

[0010] a control device for controlling reaction conditions in the condensation kettle and the hydrolysis kettle.

[0011] Optionally, the condensation kettle is externally provided with a first electric heating jacket, and internally provided with a first temperature sensor;

[0012] wherein the first electric heating jacket and the first temperature sensor are electrically connected with the control device.

[0013] Optionally, the condensation kettle is internally provided with a pressure sensor, and has a pressure relief pipe and a pressure regulating pipe communicated therewith, the pressure relief pipe is provided with a safety valve, and the pressure regulating pipe has an inert gas storage tank communicated with an end thereof away from the condensation kettle and is provided with a pressure regulating valve thereon;

[0014] wherein the pressure sensor and the pressure regulating valve are electrically connected with the control device.

[0015] Optionally, an end of the first feeding pipe away from the condensation kettle is communicated with a hydroxyacetonitrile storage tank, and is provided with a first flow regulating valve electrically connected with the control device thereon;

[0016] an end of the second feeding pipe away from the condensation kettle is communicated with a monomethylamine storage tank, and is provided with a second flow regulating valve electrically connected with the control device thereon.

[0017] Optionally, the hydrolysis kettle is externally provided with a second electric heating jacket, and internally provided with a second temperature sensor;

[0018] wherein the second electric heating jacket and the second temperature sensor are electrically connected with the control device.

[0019] Optionally, the ammonia pipe is communicated at a top of the hydrolysis kettle, and an end thereof away from the hydrolysis kettle is communicated with an ammonia gas absorption tower.

[0020] Optionally, an end of the lye pipe away from the hydrolysis kettle is communicated with a sodium hydroxide storage tank, and is provided with a third flow regulating valve electrically connected with the control device thereon.

[0021] Optionally, the condensation pipe is provided with a first metering pump;

[0022] the hydrolysis pipe is provided with a second metering pump.

[0023] Optionally, the condensation kettle and the hydrolysis kettle are both provided with a stirring assembly.

[0024] The sodium sarcosinate continuous condensation reaction system provided by the application adds a certain proportion of hydroxyacetonitrile and monomethylamine into the condensation kettle through the first feeding pipe and the second feeding pipe respectively, so that the hydroxyacetonitrile and the monomethylamine are condensed and reacted in the condensation kettle to generate a methylaminocarbonitrile solution, the methylaminocarbonitrile solution is then passed into the hydrolysis kettle through the condensation pipe, and a sodium hydroxide solution is added into the hydrolysis kettle through the lye pipe, so that the methylaminocarbonitrile solution and the sodium hydroxide solution are hydrolyzed in the hydrolysis kettle to generate a sodium sarcosinate solution, and the ammonia gas generated in the hydrolysis process is discharged through the ammonia gas pipe, then the sodium sarcosinate solution is passed into the evaporation kettle through the hydrolysis pipe, high-temperature steam is passed into the evaporation kettle through the steam pipe, and the sodium sarcosinate solution in the evaporation kettle is evaporated at high temperature by the high-temperature steam, so that the water in the sodium sarcosinate solution is evaporated, thereby improving the concentration and purity of the sodium sarcosinate, and the prepared sodium sarcosinate solution meets the actual production requirements. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The structural schematic diagram of the sodium sarcosinate continuous condensation reaction system provided by an embodiment of the present application is shown in the figure.

[0027] Figure 2 The structural schematic diagram of the sodium sarcosinate continuous condensation reaction system provided by another embodiment of the present application is shown in the figure.

[0028] Figure 3 The structural schematic diagram of the condensation kettle provided by an embodiment of the present application and provided with a stirring assembly is shown in the figure.

[0029] Figure 4 The connection schematic diagram of the components and the control device provided by an embodiment of the present application is shown in the figure.

[0030] In the figure: 100, condensation kettle; 101, first feeding pipe; 1011, hydroxyacetonitrile storage tank; 1012, first flow regulating valve; 102, second feeding pipe; 1021, monomethylamine storage tank; 1022, second flow regulating valve; 103, first electric heating jacket; 104, first temperature sensor; 105, pressure sensor; 106, pressure relief pipe; 1061, safety valve; 107, pressure regulating pipe; 1071, inert gas storage tank; 1072, pressure regulating valve; 200, hydrolysis kettle; 201, lye pipe; 2011, sodium hydroxide storage tank; 2012, third flow regulating valve; 202, ammonia pipe; 2021, ammonia absorption tower; 203, second electric heating jacket; 204, second temperature sensor; 300, condensation pipe; 301, first metering pump; 400, evaporation kettle; 401, steam pipe; 500, hydrolysis pipe; 501, second metering pump; 600, control device; 700, stirring assembly. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0032] Reference Figures 1 to 4 The present application provides a continuous condensation reaction system of creatine sodium, comprising:

[0033] The condensation kettle 100 is connected with the first feeding pipe 101 and the second feeding pipe 102, which are used to make hydroxyacetonitrile and monomethylamine entering the condensation kettle 100 from the first feeding pipe 101 and the second feeding pipe 102 respectively to generate methylaminoacetonitrile solution through condensation reaction; wherein the first feeding pipe 101 is used to add hydroxyacetonitrile into the condensation kettle 100, while the second feeding pipe 102 is used to add monomethylamine into the condensation kettle 100, and the hydroxyacetonitrile and the monomethylamine are mixed in a certain proportion, and the specific reaction equation is: HOCH2CN + CHNH = CHNHCH2CN + H2O.

[0034] The hydrolysis kettle 200 is communicated with the condensation kettle 100 through the condensation pipe 300, and the alkali pipe 201 and the ammonia pipe 202 are communicated with the hydrolysis kettle 200, for hydrolysis reaction of the methylaminoacetonitrile solution and the sodium hydroxide solution entering into the hydrolysis kettle 200 from the condensation pipe 300 and the alkali pipe 201 respectively to generate the sodium sarcosinate solution; wherein the condensation pipe 300 is used for passing the methylaminoacetonitrile solution generated after the condensation reaction of the hydroxyacetonitrile and the monomethylamine in the condensation kettle 100 into the hydrolysis kettle 200, and the alkali pipe 201 is used for adding the sodium hydroxide solution into the hydrolysis kettle 200, and the methylaminoacetonitrile solution and the sodium hydroxide solution are mixed and hydrolyzed in the hydrolysis kettle 200 in a certain proportion, and the hydrolysis reaction equation is:

[0035] CH3NHCH2CN+NaOH+H2O=CHNHCH2COONa+NH3.

[0036] In addition, the ammonia generated in the hydrolysis process of the methylaminoacetonitrile solution and the sodium hydroxide solution in the hydrolysis kettle 200 is discharged through the ammonia pipe 202, so as to avoid the generation of the ammonia dissolved in water to affect the purity of the sodium sarcosinate, thereby improving the purity of the sodium sarcosinate.

[0037] The evaporation kettle 400 is communicated with the hydrolysis kettle 200 through the hydrolysis pipe 500, and the steam pipe 401 is communicated with the evaporation kettle 400, for evaporation of the sodium sarcosinate solution entering into the evaporation kettle 400 from the hydrolysis pipe 500 through the high-temperature steam entering into the evaporation kettle 400 from the steam pipe 401 to obtain the sodium sarcosinate with a preset concentration (which can be set according to actual needs, and the present application does not make specific limitation here); wherein the water in the sodium sarcosinate solution is evaporated by the high-temperature steam to provide the concentration of the sodium sarcosinate, so that the concentration of the prepared sodium sarcosinate meets the demand of actual application.

[0038] The control device 600 is used for controlling the reaction conditions in the condensation kettle 100 and the hydrolysis kettle 200, wherein the reaction conditions include temperature, pressure and the like. In addition, in order to ensure that the pressure in the evaporation kettle 400 is within a safe range, the steam discharge pipe is communicated with the evaporation kettle 400, and the pressure gauge and the electromagnetic valve are arranged on the steam discharge pipe, and the pressure gauge and the electromagnetic valve are electrically connected with the control device 600 (not shown in the figure). The control device 600 can be a PLC controller, which can be set according to actual needs, and the present application does not make specific limitation here.

[0039] The application provides a continuous condensation reaction system of sodium sarcosinate, which comprises the following steps: adding a certain proportion of hydroxyacetonitrile and monomethylamine into a condensation kettle 100 through a first feeding pipe 101 and a second feeding pipe 102 respectively, so that the hydroxyacetonitrile and the monomethylamine are condensed and reacted in the condensation kettle 100 to generate a methylaminocarbonitrile solution; the methylaminocarbonitrile solution is introduced into a hydrolysis kettle 200 through a condensation pipe 300, and a sodium hydroxide solution is added into the hydrolysis kettle 200 through an alkali pipe 201, so that the methylaminocarbonitrile solution and the sodium hydroxide solution are hydrolyzed in the hydrolysis kettle 200 to generate a sodium sarcosinate solution, and ammonia generated in the hydrolysis process is discharged through an ammonia pipe 202; then the sodium sarcosinate solution is introduced into an evaporation kettle 400 through a hydrolysis pipe 500, high-temperature steam is introduced into the evaporation kettle 400 through a steam pipe 401, and the sodium sarcosinate solution in the evaporation kettle 400 is evaporated at high temperature, so that the water in the sodium sarcosinate solution is evaporated, thereby improving the concentration and purity of the sodium sarcosinate, and the prepared sodium sarcosinate solution meets the actual production requirements.

[0040] In some embodiments, with reference to Figure 1 、 Figure 2 and Figure 4 , the condensation kettle 100 is externally provided with a first electric heating jacket 103, and the first electric heating jacket 103 is internally provided with a first temperature sensor 104; wherein the specifications and models of the first electric heating jacket 103 and the first temperature sensor 104 can be set according to actual needs, and the application does not make specific limitations on them here.

[0041] The first electric heating jacket 103 and the first temperature sensor 104 are electrically connected with a control device 600.

[0042] In the above embodiments, the first temperature sensor 104 detects the temperature in the condensation kettle 100 in real time and transmits the detected temperature signal to the control device 600; when the temperature detected by the first temperature sensor 104 is less than a first preset temperature (which depends on the temperature required by the condensation reaction in the condensation kettle 100, and the application does not make specific limitations on it here), the control device 600 controls the first electric heating jacket 103 to heat the condensation kettle 100 until the temperature in the condensation kettle 100 detected by the first temperature sensor 104 matches a second preset temperature, and then the control device 600 controls the first electric heating jacket 103 to stop heating the condensation kettle 100.

[0043] In some embodiments, with reference to Figure 2 and Figure 4The condensation kettle 100 in the application is provided with a pressure sensor 105, and a pressure relief pipe 106 and a pressure regulating pipe 107 are communicated with the pressure sensor 105. A safety valve 1061 is arranged on the pressure relief pipe 106. An inert gas storage tank 1071 is communicated with the end of the pressure regulating pipe 107 away from the condensation kettle 100, and a pressure regulating valve 1072 is arranged on the pressure regulating pipe 107. The specifications and models of the pressure sensor 105, the safety valve 1061, and the pressure regulating valve 1072 and the like can be set according to actual needs, and the application does not make specific limitations on them here. In addition, in order to meet the requirements of specific reaction conditions, treatment of by-products, improvement of production efficiency, and protection of safety and the environment, the pressure in the condensation kettle 100 needs to be adjusted during the preparation of sodium sarcosinate by condensation reaction of hydroxyacetonitrile and methylamine in the condensation kettle 100.

[0044] The pressure sensor 105 and the pressure regulating valve 1072 are electrically connected with the control device 600.

[0045] In the above embodiment, the pressure in the condensation kettle 100 is detected by the pressure sensor 105. When the pressure value detected by the pressure sensor 105 is greater than the preset pressure value required for the condensation reaction in the condensation kettle 100 (which is set according to actual needs, and the application does not make specific limitations on it here), the safety valve 1061 will automatically open and adjust the pressure in the condensation kettle 100 to match the preset pressure value. When the pressure value detected by the pressure sensor 105 is less than the preset pressure value required for the condensation reaction in the condensation kettle 100, the control device 600 receives the pressure signal transmitted by the pressure sensor 105 and opens the pressure regulating valve 1072, so that the inert gas in the inert gas storage tank 1071 enters the condensation kettle 100, realizing the adjustment of the pressure in the condensation kettle 100 by the inert gas until the pressure in the condensation kettle 100 matches the preset pressure value. The control device 600 receives the pressure signal transmitted by the pressure sensor 105 and closes the pressure regulating valve 1072, and the inert gas does not participate in the condensation reaction, thereby ensuring the efficiency of the condensation reaction.

[0046] In some embodiments, with reference to Figure 1 , Figure 2 and Figure 4 , the first feeding pipe 101 in the application is communicated with a hydroxyacetonitrile storage tank 1011 at the end away from the condensation kettle 100, and a first flow regulating valve 1012 electrically connected with the control device 600 is arranged on the first feeding pipe 101. The hydroxyacetonitrile storage tank 1011 is used to store hydroxyacetonitrile. The flow rate of the hydroxyacetonitrile flowing through the first feeding pipe 101 is adjusted by the first flow regulating valve 1012, and the hydroxyacetonitrile is metered, so that a certain amount of hydroxyacetonitrile is introduced into the condensation kettle 100.

[0047] In addition, the second feeding pipe 102 is communicated with a methylamine storage tank 1021 at one end away from the condensation kettle, and is provided with a second flow regulating valve 1022 electrically connected with the control device 600. The methylamine storage tank 1021 is used for storing methylamine, and the second flow regulating valve 1022 is used for regulating and metering the flow of methylamine flowing through the second feeding pipe 102, so that a certain amount of methylamine is introduced into the condensation kettle 100.

[0048] In the above embodiment, the first flow regulating valve 1012 and the second flow regulating valve 1022 are arranged to make hydroxyacetonitrile and methylamine enter the condensation kettle 100 in a certain proportion and react in the condensation kettle 100, so that the condensation reaction in the condensation kettle 100 is more sufficient, thereby improving the yield of the methylaminoacetonitrile solution after the condensation reaction.

[0049] In some embodiments, with reference to Figure 1 、 Figure 2 and Figure 4 , the hydrolysis kettle 200 in the application is externally provided with a second electric heating jacket 203, and is internally provided with a second temperature sensor 204. The specifications and models of the second electric heating jacket 203 and the second temperature sensor 204 can be set according to actual needs, and the application does not make specific limitations on them here.

[0050] The second electric heating jacket 203 and the second temperature sensor 204 are electrically connected with the control device 600.

[0051] In the above embodiment, the second temperature sensor 204 is used for detecting the temperature in the hydrolysis kettle 200 in real time and transmitting the detected temperature signal to the control device 600. When the temperature detected by the second temperature sensor 204 is less than a second preset temperature (which depends on the temperature required by the hydrolysis reaction in the hydrolysis kettle 200, and the application does not make specific limitations on it here), the control device 600 controls the second electric heating jacket 203 to heat the hydrolysis kettle 200 until the temperature in the hydrolysis kettle 200 detected by the second temperature sensor 204 matches the second preset temperature, and then the control device 600 controls the second electric heating jacket 203 to stop heating the hydrolysis kettle 200.

[0052] In some embodiments, with reference to Figure 1 、 Figure 2 and Figure 4 , the ammonia gas pipe 202 in the application is communicated at the top of the hydrolysis kettle 200, so that ammonia gas can overflow into the ammonia gas pipe 202, and an ammonia gas absorption tower 2021 is communicated at one end away from the hydrolysis kettle 200.

[0053] In the above embodiment, in order to avoid the ammonia gas overflowing out of the hydrolysis kettle through the ammonia gas pipe 202 to pollute the surrounding environment, the ammonia gas generated in the hydrolysis process is introduced into the ammonia gas absorption tower 2021 through the ammonia gas pipe 202, and the main function of the ammonia gas absorption tower 2021 is to separate the ammonia gas from the waste gas by physical or chemical methods, and convert it into useful liquid (such as ammonia water or ammonium sulfate), purified gas and recyclable auxiliary liquid. The above process not only purifies the waste gas, but also recovers valuable resources, which has important environmental protection and economic benefits.

[0054] In some embodiments, referring to 1, Figure 1 and Figure 2 , the alkali pipe 201 in the application is communicated with a sodium hydroxide storage tank 2011 at one end away from the hydrolysis kettle 200, and a third flow regulating valve 2012 electrically connected with the control device 600 is arranged on the alkali pipe 201. The sodium hydroxide storage tank 2011 is used to store sodium hydroxide solution, and the concentration of the sodium hydroxide solution is set according to the actual situation of the hydrolysis reaction, which is not limited in the application.

[0055] In the above embodiment, the third flow regulating valve 2012 is used to adjust the flow rate of the sodium hydroxide solution entering the hydrolysis kettle 200 and measure the amount of the sodium hydroxide solution entering the hydrolysis kettle 200, so that a certain amount of sodium hydroxide solution is introduced into the hydrolysis kettle 200, and the process of the hydrolysis reaction is controllable and more complete.

[0056] In some embodiments, referring to Figure 4 and Figure 1 , the condensation pipe 300 in the application is provided with a first metering pump 301; the first metering pump 301 can not only transport the methylaminoacetonitrile solution generated by the condensation reaction of hydroxyacetonitrile and monomethylamine in the condensation kettle 100 into the hydrolysis kettle 200, but also measure the amount of the methylaminoacetonitrile solution entering the hydrolysis kettle 200, so that the volume of the methylaminoacetonitrile solution transported into the hydrolysis kettle 200 is certain, and the hydrolysis reaction is as complete as possible.

[0057] In addition, the hydrolysis pipe 500 is provided with a second metering pump 501. The second metering pump 501 can not only transport the sodium sarcosinate solution generated by the hydrolysis reaction of the methylaminoacetonitrile solution and the sodium hydroxide solution in the hydrolysis kettle 200 into the evaporation kettle 400, but also measure the amount of the sodium sarcosinate solution entering the evaporation kettle 400, so that the volume of the methylaminoacetonitrile solution transported into the evaporation kettle 400 is certain, which is convenient for calculating the yield of the prepared finished product sodium sarcosinate, etc.

[0058] In the above embodiment, the specifications and models of the first metering pump 301 and the second metering pump 501 can be selected according to actual needs, which are not limited in the application.

[0059] In some embodiments, referring to Figure 2 Figure 3 The condensation kettle 100 and the hydrolysis kettle 200 in the present application are both provided with a stirring assembly 700. The stirring assembly 700 includes a stirring shaft and stirring blades provided on the stirring shaft, and the stirring shaft is driven by a driving motor. The structure of the stirring assembly is not specifically limited in the present application. The present application only shows a structure schematic diagram of the stirring assembly 700 provided in the condensation kettle 100.

[0060] In the above embodiments, the stirring assembly 700 in the condensation kettle 100 stirs the hydroxyacetonitrile and the monomethylamine added into the condensation kettle 100, which can improve the uniformity of the mixture of the hydroxyacetonitrile and the monomethylamine, and further improve the condensation reaction efficiency of the hydroxyacetonitrile and the monomethylamine. In addition, the stirring assembly 700 in the hydrolysis kettle 200 stirs the methylaminoacetonitrile solution and the sodium hydroxide solution added into the hydrolysis kettle 200, which makes the hydroxyacetonitrile solution and the sodium hydroxide solution more uniformly mixed, thereby improving the hydrolysis efficiency of the methylaminoacetonitrile solution and the sodium hydroxide solution, and improving the yield of the sodium sarcosinate.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that; they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sarcosine sodium continuous condensation reaction system characterized by, The application relates to a condensation kettle (100) which is communicated with a first feeding pipe (101) and a second feeding pipe (102) and is used for condensation reaction of hydroxyacetonitrile and monomethylamine entering the condensation kettle (100) from the first feeding pipe (101) and the second feeding pipe (102) respectively to generate a methylaminoacetonitrile solution; a hydrolysis kettle (200) which is communicated with the condensation kettle (100) through a condensation pipe (300) and is communicated with a lye pipe (201) and an ammonia gas pipe (202) and is used for hydrolysis reaction of the methylaminoacetonitrile solution and a sodium hydroxide solution entering the hydrolysis kettle (200) from the condensation pipe (300) and the lye pipe (201) respectively to generate a sodium sarcosinate solution; an evaporation kettle (400) which is communicated with the hydrolysis kettle (200) through a hydrolysis pipe (500) and is communicated with a steam pipe (401) and is used for evaporation of the sodium sarcosinate solution entering the evaporation kettle (400) from the hydrolysis pipe (500) by high-temperature steam entering the evaporation kettle (400) from the steam pipe (401) to obtain sodium sarcosinate with a preset concentration; and a control device (600) used for controlling reaction conditions in the condensation kettle (100) and the hydrolysis kettle (200). The condensation kettle (100) is externally provided with a first electric heating jacket (103) and is internally provided with a first temperature sensor (104). The first electric heating jacket (103) and the first temperature sensor (104) are electrically connected with the control device (600). The condensation kettle (100) is internally provided with a pressure sensor (105) and is communicated with a pressure relief pipe (106) and a pressure regulating pipe (107), the pressure relief pipe (106) is provided with a safety valve (1061), one end of the pressure regulating pipe (107) far from the condensation kettle (100) is communicated with an inert gas storage tank (1071) and is provided with a pressure regulating valve (1072) on the pressure regulating pipe (107). The pressure sensor (105) and the pressure regulating valve (1072) are electrically connected with the control device (600).

2. The continuous sarcosinate condensation reaction system of claim 1, wherein, One end of the first feeding pipe (101) far from the condensation kettle (100) is communicated with a hydroxyacetonitrile storage tank (1011) and is provided with a first flow regulating valve (1012) electrically connected with the control device (600) on the first feeding pipe (101). One end of the second feeding pipe (102) far from the condensation kettle (100) is communicated with a monomethylamine storage tank (1021) and is provided with a second flow regulating valve (1022) electrically connected with the control device (600) on the second feeding pipe (102).

3. The continuous sarcosinate condensation reaction system of claim 2, wherein, The hydrolysis kettle (200) is externally provided with a second electric heating jacket (203) and is internally provided with a second temperature sensor (204). The second electric heating jacket (203) and the second temperature sensor (204) are electrically connected with the control device (600).

4. The continuous sarcosinate condensation reaction system of claim 1, wherein, The ammonia gas pipe (202) is communicated at the top of the hydrolysis kettle (200) and one end of the ammonia gas pipe (202) far from the hydrolysis kettle (200) is communicated with an ammonia gas absorption tower (2021). ​ 5. The continuous sarcosinate condensation reaction system of claim 1, wherein, ​ ​ 6. The continuous sarcosinate condensation reaction system of claim 1, wherein, ​ 7. The continuous sarcosinate condensation reaction system of claim 1, wherein, Said alkali solution pipe (201) is communicated with a sodium hydroxide storage tank (2011) at one end away from the hydrolysis kettle (200), and a third flow regulating valve (2012) electrically connected with the control device (600) is arranged on the sodium hydroxide storage tank (2011).

8. The continuous sarcosinate condensation reaction system according to any one of claims 1 to 7, characterized in that, A first metering pump (301) is arranged on the condensation pipe (300). A second metering pump (501) is arranged on the hydrolysis pipe (500).

9. The continuous sarcosinate condensation reaction system according to any one of claims 1 to 7, characterized in that, A stirring assembly (700) is arranged in the condensation kettle (100) and the hydrolysis kettle (200).

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