A L-carnitine recovery process in wastewater from L-carnitine production process

Abstract

The invention discloses a L-carnitine recovery process in wastewater from a L-carnitine production process, and relates to the field of L-carnitine wastewater recovery processes. Aiming at the problem that the existing discharge of wastewater containing L-carnitine causes waste of L-carnitine resources and environmental pollution, the following scheme is proposed, which includes a process flow, wherein the process flow is to recycle L-carnitine by first adsorbing the resin and then separating and recovering the L-carnitine, and the process includes the following steps: S1, adjusting the pH of the L-carnitine production wastewater to 6-7; S2, after washing the resin for multiple times, transferring the wet column to a chromatography column, and activating it with hydrochloric acid and sodium hydroxide solution in turn; S3, washing the activated resin for multiple times to neutrality. The invention has a novel structure, and the process equipment and recovery process method solve the problem that the existing discharge of wastewater containing L-carnitine causes waste of L-carnitine resources and environmental pollution.

Description

Technical Field

[0001] The invention relates to the field of L-carnitine wastewater recovery technology, in particular to a L-carnitine recovery technology in wastewater during L-carnitine production. Background Art

[0002] L-carnitine was first extracted and separated from muscle, and later studies have found that L-carnitine is an essential substance for the human body. L-carnitine is the only carrier for the transfer of fatty acids to cell mitochondria, which can promote the β-oxidation of fatty acids;

[0003] The wastewater generated in the L-carnitine production process has a high cost for outsourcing treatment and contains a large amount of recyclable materials. Recovering the L-carnitine in the L-carnitine wastewater can not only reduce the COD of the wastewater and help the treatment of the wastewater, but also has great economic value. Therefore, in order to achieve efficient recovery of the L-carnitine component in the L-carnitine wastewater, the present invention provides a process for recovering L-carnitine in the L-carnitine production wastewater. Summary of the invention

[0004] The invention provides a L-carnitine recovery process in wastewater during L-carnitine production, which solves the problem of waste of L-carnitine resources and environmental pollution caused by the discharge of existing wastewater containing L-carnitine.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A L-carnitine recovery process in wastewater from a L-carnitine production process includes a process flow, wherein the L-carnitine is recovered by resin adsorption followed by separation and recovery, and the process includes the following steps:

[0007] S1. Adjust the pH of L-carnitine production wastewater to 6-7;

[0008] S2, after washing the resin for multiple times, wet packing is transferred to a chromatography column, and activated with hydrochloric acid and sodium hydroxide solution in sequence;

[0009] S3, washing the activated resin several times until it becomes neutral;

[0010] S4, adsorbing L-carnitine production wastewater with resin;

[0011] S5. Analyzing the resin after adsorbing L-carnitine, separating the L-carnitine from the resin and recycling it.

[0012] As a preferred technical solution of the present invention, the resin used is a macroporous cation exchange resin, and the mass fraction of the hydrochloric acid solution used for resin activation is 2-4%, and the mass fraction of the sodium hydroxide solution is 2-4%.

[0013] As a preferred technical solution of the present invention, the volume ratio of hydrochloric acid and sodium hydroxide solution used for resin activation to the volume of resin is 2:1, the flow rate during resin adsorption is controlled so that the volume of water sample flowing through the chromatography column per hour is 2 to 4 times the volume of the resin, and the solution used for resin analysis is sodium hydroxide or ammonia water.

[0014] As a preferred technical solution of the present invention, the effluent after L-carnitine analysis can be added to the L-carnitine production process for recycling.

[0015] As a preferred technical solution of the present invention, it also includes process equipment, and the process equipment includes a mesh cage mechanism and a spray mechanism;

[0016] The mesh cage mechanism: baffles are fixedly connected at both ends of the inner sleeve, and a tubular metal mesh is fixedly connected between the baffles, resin particles are filled between the metal mesh, the inner sleeve and the baffle, a guide shell is connected to the outer shell of the mesh cage mechanism, brackets are fixedly arranged at both ends of the guide shell, and the baffles at both ends of the mesh cage mechanism are rotatably connected to the guide shell and the bracket through short shafts;

[0017] The spray mechanism: a waste liquid tank is arranged at the bottom end of the guide shell between the two groups of brackets, and a second water pump is arranged in the waste liquid tank, a hose is connected to the drain port of the second water pump, and a spray pipe is connected to the end of the hose, a plurality of groups of nozzles are arranged on the outer wall of the spray pipe, and both ends of the spray pipe are connected to the guide shell through a fixing plate, the waste liquid is pumped into the spray pipe through the second water pump, and sprayed to the resin in the mesh cage mechanism through the nozzle.

[0018] As a preferred technical solution of the present invention, the top of the guide shell is provided with a V-shaped notch, and the bottom end of the mesh cage mechanism passes through the guide shell.

[0019] As a preferred technical solution of the present invention, the cover plate is made of the same material as the metal mesh plate, and fixing ears are provided at both ends of the cover plate, and the fixing ears are fastened to the baffles by screws, support rods are fixedly connected between the baffles, and the support rods are distributed in a circular array with respect to the mesh cage mechanism.

[0020] As a preferred technical solution of the present invention, the three corners in the waste liquid tank are all rounded, and a first water pump is provided at the right-angle corner of the waste liquid tank, and the first water pump drives the waste liquid in the waste liquid tank to maintain a circulating flow state.

[0021] As a preferred technical solution of the present invention, both ends of the spray pipe are rotatably plugged into the fixing plate, and one end of the spray pipe is threadedly connected with a nut to clamp the fixing plate to fix the spray pipe and the spray angle of the nozzle.

[0022] As a preferred technical solution of the present invention, a motor is arranged at the top of the bracket, and the output shaft of the motor is coaxially connected with the mesh cage mechanism.

[0023] The beneficial effects of the present invention are:

[0024] 1. A L-carnitine recovery process in L-carnitine wastewater proposed by the present invention adopts chromatographic separation technology, activates the resin and then adsorbs the L-carnitine production wastewater multiple times, adsorbs the L-carnitine into the resin, collects the effluent after analysis, and can be added to the L-carnitine production process for recycling after further treatment. The process can not only reduce the COD of the L-carnitine production wastewater, but also realize the recycling of L-carnitine. The process is simple to operate, low in cost, and can effectively realize the resource utilization of L-carnitine wastewater;

[0025] 2. The process equipment uses the second water pump to pump the waste liquid into the spray pipe through the hose, and sprays it through the mesh cage mechanism with the nozzle placed downward. The waste water passes through the resin in the mesh cage mechanism and absorbs the L-carnitine component, then flows back to the waste liquid tank, and circulates continuously to achieve full recovery of the L-carnitine in the waste liquid. The motor drives the mesh cage mechanism to rotate continuously, so that the resin particles are evenly sprayed with the waste liquid, which helps to improve the efficiency of the resin particles in absorbing L-carnitine.

[0026] In summary, the process equipment and the recovery process method solve the problem of waste of L-carnitine resources and environmental pollution caused by the existing discharge of L-carnitine-containing wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention.

[0028] Figure 2 For the present invention Figure 1 Schematic diagram of the structure from another perspective.

[0029] Figure 3 It is a structural cross-sectional view of the present invention.

[0030] Figure 4 It is a structural schematic diagram of the net cage mechanism of the present invention.

[0031] Figure 5 It is a structural schematic diagram of the spray mechanism of the present invention.

[0032] Figure 6 It is a partial enlarged view of the assembly structure of the nozzle and the fixing plate of the present invention.

[0033] Numbers in the figure: 1. guide shell; 2. mesh cage mechanism; 201. inner sleeve; 202. baffle; 203. support rod; 204. metal mesh; 205. cover plate; 206. fixing ear; 207. screw; 208. motor; 3. bracket; 4. waste liquid tank; 401. fillet; 402. first water pump; 5. second water pump; 501. spray pipe; 502. nozzle; 503. fixing plate; 504. hose; 505. nut. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Reference Figure 1-Figure 6 A L-carnitine recovery process in wastewater from a L-carnitine production process includes a process flow, wherein the L-carnitine is recovered by resin adsorption followed by separation and recovery, and the process includes the following steps:

[0037] S1. Adjust the pH of L-carnitine production wastewater to 6-7;

[0038] S2, after washing the resin for multiple times, wet packing is transferred to a chromatography column, and activated with hydrochloric acid and sodium hydroxide solution in sequence;

[0039] S3, washing the activated resin several times until it becomes neutral;

[0040] S4, adsorbing L-carnitine production wastewater with resin;

[0041] S5. Analyzing the resin after adsorbing L-carnitine, separating the L-carnitine from the resin and recycling it.

[0042] The resin used is a macroporous cation exchange resin, and the mass fraction of the hydrochloric acid solution used for resin activation is 2-4%, the mass fraction of the sodium hydroxide solution is 2-4%, the volume ratio of the hydrochloric acid and sodium hydroxide solution used for resin activation to the volume of the resin is 2:1, the flow rate in the resin adsorption process is controlled so that the volume of the water sample flowing through the chromatography column per hour is 2-4 times the volume of the resin, the solution used for resin analysis is sodium hydroxide or ammonia water, and the effluent after the L-carnitine analysis can be added into the L-carnitine production process for recycling.

[0043] A L-carnitine recovery process equipment in wastewater from a L-carnitine production process, the process equipment comprising a mesh cage mechanism 2 and a spray mechanism;

[0044] refer to Figure 3 and Figure 4 , mesh cage mechanism 2: baffles 202 are fixedly connected at both ends of the inner sleeve 201, and a tubular metal mesh plate 204 is fixedly connected between the baffles 202, resin particles are filled between the metal mesh plate 204, the inner sleeve 201 and the baffle 202, a guide shell 1 is connected to the outer shell of the mesh cage mechanism 2, brackets 3 are fixedly arranged at both ends of the guide shell 1, and the baffles 202 at both ends of the mesh cage mechanism 2 are rotatably connected to the guide shell 1 and the bracket 3 through a short shaft; a motor 208 is arranged at the top of the bracket 3, and the output shaft of the motor 208 is coaxially connected to the mesh cage mechanism 2, and resin is filled through the mesh cage mechanism 2 for absorbing and recovering the L-carnitine component of the waste liquid during spraying, and the mesh cage mechanism 2 is driven by the motor 208 to rotate continuously, so that the resin particles are evenly sprayed with the waste liquid, which helps to improve the efficiency of the resin particles in absorbing L-carnitine.

[0045] refer to Figure 2 , Figure 5 and Figure 6 Spraying mechanism: A waste liquid tank 4 is arranged at the bottom end of the guide shell 1 between the two groups of brackets 3, and a second water pump 5 is arranged in the waste liquid tank 4, a hose 504 is connected to the drain port of the second water pump 5, and a spray pipe 501 is connected to the end of the hose 504, a plurality of groups of nozzles 502 are arranged on the outer wall of the spray pipe 501, and both ends of the spray pipe 501 are connected to the guide shell 1 through a fixing plate 503, the waste liquid is pumped into the spray pipe 501 through the second water pump 5, and sprayed to the resin in the mesh cage mechanism 2 through the nozzle 502.

[0046] refer to Figure 1 The top of the guide shell 1 is V-shaped with a notch, and the bottom end of the mesh cage mechanism 2 passes through the guide shell 1. The wide-mouth design can prevent waste liquid from splashing to the outside during spraying.

[0047] The cover plate 205 is made of the same material as the metal mesh plate 204 , and fixing ears 206 are provided at both ends of the cover plate 205 , and the fixing ears 206 are fastened to the baffle 202 by screws 207 , and support rods 203 are fixedly connected between the baffles 202 , and the support rods 203 are distributed in a circular array with respect to the mesh cage mechanism 2 .

[0048] Referring to the figure, the three corners in the waste liquid tank 4 are all rounded 401. A first water pump 402 is provided at the right-angle corner of the waste liquid tank 4. The first water pump 402 drives the waste liquid in the waste liquid tank 4 to maintain a circulating flow state. The first water pump 402 draws waste liquid from the bottom and sprays it along the side wall of the waste liquid tank 4, so that the waste liquid circulates along the side wall of the waste liquid tank 4, thereby avoiding the second water pump 5 from only extracting local waste liquid in the waste liquid tank 4.

[0049] Both ends of the spray pipe 501 are rotatably plugged with the fixing plate 503 , and one end of the spray pipe 501 is threadedly connected with a nut 505 to clamp the fixing plate 503 , thereby fixing the spray angles of the spray pipe 501 and the spray head 502 .

[0050] The working principle of the L-carnitine wastewater recovery L-carnitine process equipment:

[0051] The waste liquid produced by producing L-carnitine is poured into the waste liquid tank 4, and the first water pump 402 draws the waste liquid from the bottom and sprays it along the side wall of the waste liquid tank 4, so that the waste liquid circulates along the side wall of the waste liquid tank 4, thereby preventing the second water pump 5 from only extracting the waste liquid in the waste liquid tank 4 locally. The waste liquid is pumped into the spray pipe 501 through the hose 504 by the second water pump 5, and sprayed through the net cage mechanism 2 placed downward by the nozzle 502. After the waste water passes through the resin in the net cage mechanism 2 and absorbs the L-carnitine component, it flows back to the waste liquid tank 4, and circulates continuously, thereby realizing the full recovery of the L-carnitine in the waste liquid;

[0052] The spraying angle of the spray head 502 is adjustable by loosening the nut 505, deflecting the spray head 502 and the spray pipe 501, and then tightening the nut 505;

[0053] Resin feeding and discharging of the mesh cage mechanism 2: When feeding the resin, the cover plate 205 in the mesh cage mechanism 2 is rotated to the top by the motor 208, the screws 207 are removed, and the cover plate 205 is removed, and the resin particles can be filled into the mesh cage mechanism 2. After the circulating filtration of the waste liquid is completed, the waste liquid tank 4 is removed, and the resin recovery tank is moved to the bottom of the mesh cage mechanism 2, and the cover plate 205 is removed in the same way as when feeding the resin, and then the cover plate 205 is rotated to the downward direction by the motor 208, and the resin particles in the mesh cage mechanism 2 are dumped into the recovery tank.

[0054] Example:

[0055] A process for recovering L-carnitine from L-carnitine wastewater, which adopts a method of first resin adsorption and then separation and recovery, and the steps are as follows:

[0056] S1. Take 200 ml of L-carnitine production wastewater discharged from a certain manufacturer, adjust the pH to 6-7, and measure the L-carnitine concentration in the wastewater to be 5 mg / g;

[0057] S2. Take 100 ml of WZ-613 resin, place it in a 250 ml beaker, wash it several times, and transfer it to the chromatography column by wet column loading. Take 200 ml of 2% HCl solution and add it dropwise to the above chromatography column, control the dropping speed, and add it within 40 minutes. Then take 200 ml of 2% NaOH solution and add it dropwise to the chromatography column, control the dropping speed, and add it within 40 minutes;

[0058] S3, washing the resin with distilled water until the pH of the effluent is 6-7;

[0059] S4. 200 ml of L-carnitine production wastewater was added dropwise to the above-mentioned chromatography column at a dropping speed of 1 second / drop. The effluent was collected and the L-carnitine concentration in the effluent was measured to be 3.7 mg / g.

[0060] The above are only preferred implementations of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. Other undetailed parts of the present invention belong to the prior art, so they are not repeated here. Finally, it should be explained that the above embodiments are only used to illustrate the technical scheme of the present invention, rather than to limit it. Although the present invention is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical schemes recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the present invention.

Claims

1. A L-carnitine recovery device in wastewater from a L-carnitine production process, characterized in that: It comprises a mesh cage mechanism (2), a cover plate (205) and a spray mechanism; The mesh cage mechanism (2): baffles (202) are fixedly connected at both ends of the inner sleeve (201), and a tubular metal mesh plate (204) is fixedly connected between the baffles (202); resin particles are filled between the metal mesh plate (204), the inner sleeve (201) and the baffles (202); a guide shell (1) is connected to the outer shell of the mesh cage mechanism (2); brackets (3) are fixedly provided at both ends of the guide shell (1); and the baffles (202) at both ends of the mesh cage mechanism (2) are rotatably connected to the guide shell (1) and the bracket (3) via short shafts; fixing ears (206) are provided at both ends of the cover plate (205), and the fixing ears (206) and the baffles (202) are fastened via screws (207); support rods (203) are fixedly connected between the baffles (202), and the support rods (203) are distributed in a ring array with respect to the mesh cage mechanism (2); The spray mechanism: a waste liquid tank (4) is arranged between the two groups of brackets (3) at the bottom end of the guide shell (1), and a second water pump (5) is arranged in the waste liquid tank (4); a hose (504) is connected to the drain port of the second water pump (5), and a spray pipe (501) is connected to the end of the hose (504); a plurality of groups of spray heads (502) are arranged on the outer wall of the spray pipe (501), and both ends of the spray pipe (501) are connected to the guide shell (1) through a fixing plate (503); waste liquid is pumped into the spray pipe (501) through the second water pump (5), and sprayed onto the resin in the mesh cage mechanism (2) through the spray heads (502); the waste liquid The three corners in the box (4) are all rounded (401). The waste liquid box (4) is provided with a first water pump (402) at a right-angle corner. The first water pump (402) drives the waste liquid in the waste liquid box (4) to maintain a circulating flow state. The two ends of the spray pipe (501) are rotatably plugged with the fixing plate (503), and one end of the spray pipe (501) is threadedly connected with a nut (505) to clamp the fixing plate (503) to fix the spray angle of the spray pipe (501) and the spray head (502). The top end of the bracket (3) is provided with a motor (208), and the output shaft of the motor (208) is coaxially connected with the mesh cage mechanism (2).

2. The L-carnitine recovery device in wastewater from a L-carnitine production process according to claim 1, characterized in that: The top end of the guide shell (1) is provided with a V-shaped notch, and the bottom end of the mesh cage mechanism (2) passes through the guide shell (1).

3. The L-carnitine recovery device in wastewater from a L-carnitine production process according to claim 1, characterized in that: The cover plate (205) is made of the same material as the metal mesh plate (204).

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