A device and method for efficiently decarboxylating cashew shell liquid to generate a cashew phenol mixture

Abstract

The present application relates to a kind of cashew shell liquid high-efficiency decarboxylation generation cashew phenol mixture device and method, including cashew shell liquid storage structure, secondary stable heat supply structure, central control cabinet, electric control wire, cashew shell liquid storage structure and oxalic acid solution proportioning structure are arranged in parallel, and cashew shell liquid storage structure and oxalic acid solution proportioning structure are connected in the back of continuous static mixing structure, preheating structure is connected on continuous static mixing structure, impurity filter is connected in the front of continuous static mixing structure, vacuum pump group and secondary stable heat supply structure are respectively connected on decarboxylation reactor, the front of the impurity filter is connected in the back of decarboxylation reactor the present application optimizes the setting of cashew shell liquid decarboxylation generation cashew phenol mixture structure, changes traditional high temperature and high pressure decarboxylation environment, improves to a kind of negative pressure low temperature production equipment, reduces polymer production, simultaneously using two-stage temperature control equipment, so that decarboxylation process temperature is more stable, supporting vacuum equipment can provide vacuum environment while also can extract the gas generated in decarboxylation process.

Description

Technical Field

[0001] This invention relates to the field of food chemistry, and in particular to an apparatus and method for efficiently decarboxylating cashew nut shell liquid to generate a mixture of cashew nut alcohol. Background Technology

[0002] In the decarboxylation process of cashew shell liquid, a tubular reactor with a high-pressure liquid phase system and heat transfer oil is used in a high-temperature, open environment of 225~270℃. When the decarboxylation temperature is greater than 130℃ and the environment is open, cashew phenol polymers begin to be generated. As the temperature increases and the time is extended, the polymer reactants will increase exponentially. This will not only significantly reduce the yield and purity of the target product cashew phenol, but the generated polymers will also adhere to and deposit on the inner wall of the reactor, the conveying pipelines, and the catalyst surface, causing the pipeline diameter to narrow and become blocked. It will also cause the catalyst active sites to be covered and deactivated, which will significantly increase the frequency of equipment cleaning and maintenance and production costs, while also shortening the continuous operation cycle of the unit. Existing decarboxylation processes for cashew nut shell liquids mostly employ batch reaction processes, resulting in poor temperature uniformity within the reaction system, making it difficult to stably control the decarboxylation process. Furthermore, insufficient mixing of materials and catalysts, along with poor oxalic acid ratio accuracy, easily leads to incomplete decarboxylation or excessive side reactions. On the other hand, existing continuous production equipment lacks sufficient temperature control precision, failing to stably maintain a low-temperature decarboxylation environment that meets the requirements for low side reactions. This makes it difficult to effectively suppress the polymerization side reactions of cashew nut phenol, resulting in significant quality fluctuations in the final cashew phenol product, with low purity and yield, which cannot meet the quality requirements of downstream high-end applications for cashew phenol raw materials. Therefore, a device for efficient decarboxylation of cashew nut shell liquids to generate a cashew phenol mixture is designed. Summary of the Invention

[0003] The purpose of this invention is to provide an apparatus and method for efficiently decarboxylating cashew nut shell liquid to generate a cashew phenol mixture, in order to solve the above-mentioned technical problems. To achieve the above objective, the present invention adopts the following technical solution:

[0004] A device for efficiently decarboxylating cashew nut shell liquid to generate a cashew phenol mixture includes a cashew nut shell liquid storage structure, an oxalic acid solution proportioning structure, a continuous static mixing structure, an impurity filter, a preheating structure, a vacuum pump group, a decarboxylation reactor, a secondary stable heating structure, a central control cabinet, and electrical control wiring. The cashew nut shell liquid storage structure and the oxalic acid solution proportioning structure are arranged side by side and connected to the rear side of the continuous static mixing structure. The preheating structure is connected to the continuous static mixing structure, and the impurity filter is connected to the front side of the continuous static mixing structure. The vacuum pump group and the secondary stable heating structure are respectively connected to the decarboxylation reactor, and the front side of the impurity filter is connected to the rear side of the decarboxylation reactor. The cashew nut shell liquid storage structure, oxalic acid solution proportioning structure, continuous static mixing structure, impurity filter, preheating structure, vacuum pump group, decarboxylation reactor, and secondary stable heating structure are all connected to the central control cabinet via electrical control wiring.

[0005] Based on the above technical solution, the oxalic acid solution mixing structure comprises an oxalic acid stock solution storage tank, an aqueous solution storage tank, a precision mixing pump, and a mixing pipeline. The oxalic acid stock solution storage tank and the aqueous solution storage tank are arranged side by side. The precision mixing pump is connected to the front of both the oxalic acid stock solution storage tank and the aqueous solution storage tank. The rear end of the mixing pipeline is connected to two sets of precision mixing pumps, and the front end of the mixing pipeline is connected to a continuous static mixing structure. The preheating structure comprises an oil temperature and heat control pump set, an oil supply pipeline, and an oil return pipeline. The oil supply pipeline... The oil circuit pipeline is connected to the oil temperature control pump group, and the oil circuit pipeline and the oil supply pipeline are connected to the upper and lower sides of the continuous static mixing structure, respectively. The discharge end of the cashew nut shell liquid storage structure is connected to the cashew nut shell liquid supply pump group, and the end of the cashew nut shell liquid supply pump group is connected to the rear side of the continuous static mixing structure. The oxalic acid stock solution storage tank, the aqueous solution storage tank, and the upper part of the cashew nut shell liquid storage structure are all equipped with tank pressure balance valves. The precision proportioning pump, the oil temperature control pump group, and the cashew nut shell liquid supply pump group are all connected to the central control cabinet through electrical control cables.

[0006] Based on the above technical solution, the impurity filter is connected in series between the decarboxylation reactor and the continuous static mixing structure, and a shell liquid supply pump group is connected in series after the impurity filter. A finished product extraction pump group is connected in parallel between the shell liquid supply pump group and the decarboxylation reactor. A vacuum diversion pipeline and a single reactor vacuum pipeline are provided between the vacuum pump group and the decarboxylation reactor. The vacuum diversion pipeline is connected to the vacuum pump group. A single reactor vacuum pipeline is connected between the decarboxylation reactor and the vacuum diversion pipeline. An oil diversion pipeline, a single reactor oil supply pipeline, and a single reactor oil return pipeline are provided between the secondary stable heating structure and the decarboxylation reactor. The single reactor oil supply pipeline and the single reactor oil return pipeline are connected between the secondary stable heating structure and the decarboxylation reactor. Each single reactor vacuum pipeline connection end on the vacuum diversion pipeline is equipped with an electrically controlled valve. Each single reactor oil supply pipeline connection end on the oil diversion pipeline is equipped with an electrically controlled valve. The electrically controlled valves and the shell liquid supply pump group are all connected to the central control cabinet through electrical control cables.

[0007] Based on the above technical solution, the cashew nut shell liquid storage structure consists of a cashew nut shell liquid storage tank, an external insulation layer, a valved inlet pipe, a raw material outlet pipe, temperature and pressure detection probes, and an internal electric heating plate. The internal electric heating plate is fixed to the inner bottom of the cashew nut shell liquid storage tank. The external insulation layer covers the outer wall of the cashew nut shell liquid storage tank. The valved inlet pipe is connected to the rear top side of the cashew nut shell liquid storage tank. The raw material outlet pipe is connected to the front bottom side of the cashew nut shell liquid storage tank. The temperature and pressure detection probes are arranged on the inner wall of the cashew nut shell liquid storage tank. The tank pressure balance valve is located at the top of the cashew nut shell liquid storage tank. The valved inlet pipe, temperature and pressure detection probes, and internal electric heating plate are all connected to the central control cabinet via electrical control cables. The rear end of the raw material outlet pipe is connected to a continuous static mixing structure via a cashew nut shell liquid supply pump set.

[0008] Based on the above technical solution, the continuous static mixing structure comprises a mixing tank, a tank support, a fruit shell liquid inlet pipe, a mixed liquid outlet pipe, a preheated oil inlet pipe, a preheated oil outlet pipe, an oxalic acid solution inlet pipe, an outer stator of the coil, a mixing roller frame, rotor magnetic plates on the frame, a double-end bearing of the mixing frame, and a temperature and pressure probe. The tank support is fixed to the outer bottom side of the mixing tank. The fruit shell liquid inlet pipe is connected to the center of the rear side of the mixing tank. The oxalic acid solution inlet pipe is connected to the rear side of the mixing tank. The mixed liquid outlet pipe is connected to the bottom side of the mixing tank. An oil circulation jacket is provided on the side wall of the mixing tank. The preheated oil inlet pipe and the preheated oil outlet pipe are respectively connected to the upper and lower sides of the oil circulation jacket. The mixing frame double-end bearing... The mixing roller frame is installed at both ends of the mixing tank. The mixing roller frame is mounted on two sets of double-end bearings. The outer stator of the coil is fixed in the middle section of the mixing tank. The rotor magnetic plates on the frame are arranged at equal circumferential angles and fixed on the outer side of the middle section of the mixing roller frame. The rotor magnetic plates on the frame and the outer stator of the coil are electromagnetically connected. The temperature and pressure probes are arranged on the oil circulation jacket and the side wall of the mixing tank. The outer stator of the coil and the temperature and pressure probes are connected to the central control cabinet through electrical control wires. The preheated oil inlet pipe and the preheated oil outlet pipe are connected to the oil supply pipeline and the oil circuit pipeline respectively. The front end of the shell liquid inlet pipe is connected to the raw material outlet pipe on the front side of the shell liquid storage tank through the shell liquid supply pump set. The mixed liquid outlet pipe is connected to the impurity filter.

[0009] Based on the above technical solution, the decarboxylation reactor consists of a shell liquid distribution pipeline, individual tubular reactors, and a three-way valved supply pipeline. The individual tubular reactors are arranged in an array, with multiple sets of individual tubular reactors connected to the ends of the shell liquid distribution pipeline. Electrically controlled valves are correspondingly installed on the shell liquid distribution pipeline. The three-way valved supply pipeline is connected to the beginning of the shell liquid distribution pipeline and is connected in series to the shell liquid supply pump group downstream of the impurity filter. The finished product extraction pump group consists of a linked single-control valve and an extraction pump. The linked single-control valve is connected to the bottom side of the three-way valved supply pipeline, and the extraction pump is connected in series to the bottom side of the linked single-control valve. The single-reactor oil supply pipeline, single-reactor oil circuit pipeline, and single-reactor vacuum pipeline are correspondingly connected to the individual tubular reactors. The individual tubular reactors, the three-way valved supply pipeline, and the electrically controlled valves are all connected to the central control cabinet via electrical control cables.

[0010] Based on the above technical solution, the single-unit tubular reactor comprises a reaction tube, a tube end cap, an oil inlet pipe, an oil outlet pipe, a semi-liquid inlet pipe, a vacuum inlet pipe, a catalyst filling core, an inner core tube support, a sealing gasket, and temperature and pressure probes. The sidewall of the reaction tube is provided with an oil circulation jacket. The oil inlet pipe and oil outlet pipe are correspondingly connected to the upper and lower sides of the oil circulation jacket. The tube end cap is sealed to the rear end of the reaction tube via a sealing gasket. The vacuum inlet pipe is connected to the top side of the reaction tube. The inner core tube support is fixed inside the middle section of the reaction tube. The catalyst filling core... The core is sealed to the center of the tube end cap via a sealing gasket, and the middle section of the catalyst core is fixed to the core tube support inside the tube. The temperature and pressure probes are arranged inside the inner wall of the reaction tube and the side wall of the oil circulation jacket. The semi-finished liquid inlet pipe is connected to the tube end cap, and the rear end of the semi-finished liquid inlet pipe is connected to the fruit shell liquid distribution pipeline. The oil inlet pipe and oil outlet pipe are connected to the single reactor oil supply pipeline and the single reactor oil circuit pipeline, respectively. The vacuum inlet pipe is connected to the single reactor vacuum pipeline, and the temperature and pressure probes are connected to the central control cabinet via electrical control wires.

[0011] Based on the above technical solution, the internal temperature accuracy of the circulating oil regulating reaction tube of the preheating structure and the secondary stable heating structure is 126±1℃, and the catalyst filling core is filled with a low-temperature adapted Ce-Cu shaped solid catalyst.

[0012] Compared with the prior art, the present invention has the following advantages: The present invention optimizes the structure of the cashew shell liquid decarboxylation to generate cashew phenol mixture, changes the traditional high temperature and high pressure decarboxylation environment, and improves it into a negative pressure low temperature production equipment, reducing polymer production. At the same time, it adopts a two-stage temperature control equipment, which makes the temperature of the decarboxylation process more stable. The matching vacuum equipment can provide a vacuum environment and also extract the gas generated during the decarboxylation process. Attached Figure Description

[0013] Figure 1 This is a diagram showing the overall appearance of the present invention.

[0014] Figure 2 This is a schematic diagram of the local grouping state of the present invention.

[0015] Figure 3 This is a schematic diagram of the local grouping state of the present invention.

[0016] Figure 4 This is a schematic diagram of the cashew shell liquid storage structure of the present invention.

[0017] Figure 5 This is a schematic plan view of the cashew shell liquid storage structure of the present invention.

[0018] Figure 6 This is a schematic diagram of the continuous static hybrid structure of the present invention.

[0019] Figure 7 This is a half-section detail diagram of the continuous static hybrid structure of the present invention.

[0020] Figure 8 This is a schematic diagram of the decarboxylation reactor of the present invention.

[0021] Figure 9 This is a schematic diagram of the single-unit tubular reactor of the present invention.

[0022] Figure 10 This is a schematic diagram showing a partial cross-section of the single-tube reactor of the present invention.

[0023] In the diagram: 1. Cashew shell liquid storage structure; 2. Oxalic acid solution mixing structure; 3. Continuous static mixing structure; 4. Impurity filter; 5. Preheating structure; 6. Vacuum pump group; 7. Decarboxylation reactor; 8. Secondary stable heating structure; 9. Central control cabinet; 10. Electrical control wires; 11. Cashew shell liquid supply pump group; 12. Tank pressure balancing valve; 13. Finished product extraction pump group; 14. Electrical control valve.

[0024] Oxalic acid stock solution storage tank 2-1, aqueous solution storage tank 2-2, precision proportioning pump 2-3, mixing pipeline 2-4;

[0025] Oil cooling and heating control pump set 5-1, oil supply pipeline 5-2, oil circuit pipeline 5-3, vacuum diversion pipeline 6-1, single reactor vacuum pipeline 6-2, oil diversion pipeline 8-1, single reactor oil supply pipeline 8-2, single reactor oil circuit pipeline 8-3;

[0026] Fruit shell liquid storage tank 1-1, external insulation layer 1-2, inlet pipe with valve 1-3, raw material discharge pipe 1-4, temperature and pressure detection probe 1-5, internal electric heating plate 1-6;

[0027] 3-1 Mixing tank, 3-2 Tank support, 3-3 Fruit shell liquid inlet pipe, 3-4 Mixed liquid outlet pipe, 3-5 Preheating inlet pipe, 3-6 Preheating outlet pipe, 3-7 Oxalic acid solution inlet pipe, 3-8 Coil outer stator, 3-9 Mixing roller frame, 3-10 Rotor magnetic sheet on the frame, 3-11 Double-end bearing of mixing frame, 3-12 Temperature and pressure probe, 3-13 Oil circulation jacket;

[0028] Fruit shell liquid diversion pipeline 7-1, single tubular reactor 7-2, three-way supply pipeline with valve 7-3;

[0029] Linkage single-control valve 13-1, extraction pump 13-2;

[0030] 72-1 Reaction tube, 72-2 Tube end cap, 72-3 Oil inlet tube, 72-4 Oil outlet tube, 72-5 Semi-finished liquid inlet tube, 72-6 Vacuum inlet tube, 72-7 Catalyst filling core, 72-8 Inner tube support, 72-9 Sealing gasket. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] A device for efficiently decarboxylating cashew nut shell liquid to generate a cashew phenol mixture includes a cashew nut shell liquid storage structure 1, an oxalic acid solution proportioning structure 2, a continuous static mixing structure 3, an impurity filter 4, a preheating structure 5, a vacuum pump group 6, a decarboxylation reactor 7, a secondary stable heating structure 8, a central control cabinet 9, and electrical control wiring 10. The cashew nut shell liquid storage structure 1 and the oxalic acid solution proportioning structure 2 are arranged side by side, and the cashew nut shell liquid storage structure 1 and the oxalic acid solution proportioning structure 2 are connected to the rear side of the continuous static mixing structure 3. The preheating structure 5 is connected to... On the continuous static mixing structure 3, the impurity filter 4 is connected to the front side of the continuous static mixing structure 3, the vacuum pump group 6 and the secondary stable heating structure 8 are respectively connected to the decarboxylation reactor 7, the front side of the impurity filter 4 is connected to the rear side of the decarboxylation reactor 7, and the cashew shell liquid storage structure 1, the oxalic acid solution proportioning structure 2, the continuous static mixing structure 3, the impurity filter 4, the preheating structure 5, the vacuum pump group 6, the decarboxylation reactor 7, and the secondary stable heating structure 8 are all connected to the central control cabinet 9 through the electrical control cable 10.

[0033] The oxalic acid solution mixing structure 2 consists of an oxalic acid stock solution storage tank 2-1, an aqueous solution storage tank 2-2, a precision mixing pump 2-3, and a mixing pipeline 2-4. The oxalic acid stock solution storage tank 2-1 and the aqueous solution storage tank 2-2 are arranged side-by-side. The precision mixing pump 2-3 is connected to the front of both the oxalic acid stock solution storage tank 2-1 and the aqueous solution storage tank 2-2. The rear end of the mixing pipeline 2-4 is connected to two sets of precision mixing pumps 2-3, and the front end of the mixing pipeline 2-4 is connected to the continuous static mixing structure 3. The preheating structure 5 consists of an oil temperature and heat regulation pump set 5-1, an oil supply pipeline 5-2, and an oil return pipeline 5-3. The oil supply pipeline 5-... 2 and oil circuit pipeline 5-3 are respectively connected to oil cooling and heating control pump group 5-1, and oil circuit pipeline 5-3 and oil supply pipeline 5-2 are respectively connected to the upper and lower sides of continuous static mixing structure 3. The discharge end of the cashew shell liquid storage structure 1 is connected to cashew shell liquid supply pump group 11, and the end of the cashew shell liquid supply pump group 11 is connected to the rear side of continuous static mixing structure 3. The oxalic acid stock solution storage tank 2-1, aqueous solution storage tank 2-2, and cashew shell liquid storage structure 1 are all equipped with tank pressure balance valve 12. The precision proportioning pump 2-3, oil cooling and heating control pump group 5-1, and cashew shell liquid supply pump group 11 are all connected to the central control cabinet 9 through electrical control wires 10.

[0034] The impurity filter 4 is connected in series between the decarboxylation reactor 7 and the continuous static mixing structure 3, and a fruit shell liquid supply pump group 11 is connected in series downstream of the impurity filter 4. A finished product extraction pump group 13 is connected in parallel between the fruit shell liquid supply pump group 11 and the decarboxylation reactor 7. A vacuum split line 6-1 and a single reactor vacuum line 6-2 are provided between the vacuum pump group 6 and the decarboxylation reactor 7. The vacuum split line 6-1 is connected to the end of the vacuum pump group 6, and the single reactor vacuum line 6-2 is connected between the decarboxylation reactor 7 and the vacuum split line 6-1. A secondary stable heating structure 8 is provided between the decarboxylation reactor 7 and the decarboxylation reactor 7. There are oil diversion pipelines 8-1, single-reactor oil supply pipelines 8-2, and single-reactor oil return pipelines 8-3. The single-reactor oil supply pipelines 8-2 and 8-3 are connected between the secondary stable heating structure 8 and the decarboxylation reactor 7. Each single-reactor vacuum pipeline 6-2 on the vacuum diversion pipeline 6-1 is equipped with an electrically controlled valve 14 at its connection end. The single-reactor oil supply pipelines 8-2 on the oil diversion pipeline 8-1 are also equipped with electrically controlled valves 14 at their connection ends. The electrically controlled valves 14 and the shell liquid supply pump group 11 are all connected to the central control cabinet 9 via electrical control cables 10.

[0035] The cashew nut shell liquid storage structure 1 consists of a cashew nut shell liquid storage tank 1-1, an external insulation layer 1-2, a valved inlet pipe 1-3, a raw material discharge pipe 1-4, a temperature and pressure detection probe 1-5, and an internal electric heating plate 1-6. The internal electric heating plate 1-6 is fixed to the inner bottom of the cashew nut shell liquid storage tank 1-1. The external insulation layer 1-2 covers the outer wall of the cashew nut shell liquid storage tank 1-1. The valved inlet pipe 1-3 is connected to the rear top side of the cashew nut shell liquid storage tank 1-1. The raw material... The discharge pipe 1-4 is connected to the bottom front end of the fruit shell liquid storage tank 1-1. The temperature and pressure detection probes 1-5 are arranged on the inner wall of the fruit shell liquid storage tank 1-1. The tank pressure balance valve 12 is located at the top of the fruit shell liquid storage tank. The valved input pipe 1-3, the temperature and pressure detection probes 1-5, and the internal electric heating plate 1-6 are all connected to the central control cabinet 9 through the electrical control wires 10. The rear end of the raw material discharge pipe 1-4 is connected to the continuous static mixing structure 3 through the fruit shell liquid supply pump group 11.

[0036] The continuous static mixing structure 3 consists of a mixing tank 3-1, a tank support 3-2, a fruit shell liquid inlet pipe 3-3, a mixed liquid outlet pipe 3-4, a preheating inlet pipe 3-5, a preheating outlet pipe 3-6, an oxalic acid solution inlet pipe 3-7, an outer stator of the coil 3-8, a mixing roller frame 3-9, a rotor magnetic plate on the frame 3-10, a double-end bearing of the mixing frame 3-11, and a temperature and pressure probe 3-12. The tank support 3-2 is fixed to the outer bottom side of the mixing tank 3-1. The shell liquid inlet pipe 3-3 is connected to the center of the rear side of the mixing tank 3-1. The oxalic acid solution inlet pipe 3-7 is connected to the rear side of the mixing tank 3-1. The mixed liquid outlet pipe 3-4 is connected to the bottom side of the mixing tank 3-1. The side wall of the mixing tank 3-1 is provided with an oil circulation jacket 3-13. The preheating inlet pipe 3-5 and the preheating outlet pipe 3-6 are respectively connected to the upper and lower sides of the oil circulation jacket 3-13. The mixing frame double-end bearing 3-11 is... The mixing roller frame 3-9 is mounted on two sets of double-end bearings inside the mixing tank 3-1. The outer stator 3-8 of the coil is fixed in the middle section of the mixing tank 3-1. The rotor magnetic plates 3-10 on the frame are arranged at equal circumferential angles and fixed on the outer side of the middle section of the mixing roller frame 3-9. The rotor magnetic plates 3-10 on the frame and the outer stator 3-8 of the coil are correspondingly electromagnetically connected. The temperature and pressure probes 3-12 are arranged in the oil circulation jacket 3-13. On the side wall of the mixing tank 3-1, the outer stator 3-8 of the coil and the temperature and pressure probe 3-12 are connected to the central control cabinet 9 through the electrical control wire 10. The preheating inlet pipe 3-5 and the preheating outlet pipe 3-6 are respectively connected to the oil supply line 5-2 and the oil circuit line 5-3. The front end of the shell liquid inlet pipe 3-3 is connected to the raw material outlet pipe 1-4 on the front side of the shell liquid storage tank 1-1 through the shell liquid supply pump group 11. The mixed liquid outlet pipe 3-4 is connected to the impurity filter 4.

[0037] The decarboxylation reactor 7 consists of a fruit shell liquid distribution pipeline 7-1, individual tubular reactors 7-2, and a three-way valved supply pipeline 7-3. The individual tubular reactors 7-2 are arranged in an array, with multiple sets of individual tubular reactors 7-2 connected to the ends of the fruit shell liquid distribution pipeline 7-1. Each fruit shell liquid distribution pipeline 7-1 is equipped with an electrically controlled valve 14. The three-way valved supply pipeline 7-3 is connected to the beginning of the fruit shell liquid distribution pipeline 7-1 and is connected in series with the fruit shell liquid supply pump group 11 downstream of the impurity filter 4. The product extraction pump group 13 consists of a linkage single-control valve 13-1 and an extraction pump 13-2. The linkage single-control valve 13-1 is connected to the bottom side of the three-way valve supply line 7-3. The extraction pump 13-2 is connected in series to the bottom side of the linkage single-control valve 13-1. The single reactor oil supply line 8-2, the single reactor oil circuit line 8-3, and the single reactor vacuum line 6-2 are respectively connected to the single tubular reactor 7-2. The single tubular reactor 7-2, the three-way valve supply line 7-3, and the electrically controlled valve 14 are all connected to the central control cabinet 9 through the electrical control cable 10.

[0038] The single-unit tubular reactor 7-2 consists of a reaction tube 72-1, a tube end cap 72-2, an oil inlet pipe 72-3, an oil outlet pipe 72-4, a semi-liquid inlet pipe 72-5, a vacuum inlet pipe 72-6, a catalyst filling core 72-7, an inner core tube support 72-8, a sealing gasket 72-9, and a temperature and pressure probe 3-12. The side wall of the reaction tube 72-1 is provided with an oil circulation jacket 3-13. The oil inlet pipe 72-3 and the oil outlet pipe 72-4 are connected to the upper and lower sides of the oil circulation jacket 3-13 respectively. The tube end cap 72-2 is sealed to the rear end of the reaction tube 72-1 by the sealing gasket 72-9. The vacuum inlet pipe 72-6 is connected to the top side of the reaction tube 72-1. The inner core tube support 72-8 is fixed inside the middle section of the reaction tube 72-1. The catalyst... The catalyst filling core 72-7 is sealed to the center of the tube end cap 72-2 by a sealing gasket 72-9, and the middle section of the catalyst filling core 72-7 is fixed on the inner tube support 72-8. The temperature and pressure probes 3-12 are arranged in the inner wall of the reaction tube 72-1 and the side wall of the oil circulation jacket 3-13. The semi-finished liquid inlet pipe 72-5 is connected to the tube end cap 72-2. The rear end of the semi-finished liquid inlet pipe 72-5 is connected to the fruit shell liquid diversion pipeline 7-1. The oil inlet pipe 72-3 and the oil outlet pipe 72-4 are connected to the single reactor oil supply pipeline 8-2 and the single reactor oil circuit pipeline 8-3, respectively. The vacuum inlet pipe 72-6 is connected to the single reactor vacuum pipeline 6-2. The temperature and pressure probes 3-12 are connected to the central control cabinet 9 through the electrical control cable 10.

[0039] The internal temperature accuracy of the circulating oil regulating reaction tube 72-1 of the preheating structure 5 and the secondary stable heating structure 8 is 126±1℃. The catalyst filling core 72-7 is filled with a low-temperature adapted Ce-Cu shaped solid catalyst.

[0040] The method for generating a cashew nut phenol mixture using the device of the present invention is as follows: First, before production, cashew nut shell liquid raw material is injected into cashew shell liquid storage tank 1-1 through valved input pipe 1-3. The central control cabinet 9 controls the internal electric heating plate 1-6 to preheat the raw material. The external insulation layer 1-2 of the tank reduces heat loss. The temperature and pressure detection probe 1-5 collects the temperature and pressure data inside the tank in real time and feeds it back to the central control cabinet 9. The tank pressure balancing valve 12 automatically adjusts the pressure inside the tank to maintain the stability of the raw material storage state.

[0041] During production, the central control cabinet 9 starts the precision mixing pump 2-3 of the oxalic acid solution mixing structure 2. According to the set ratio, the oxalic acid stock solution in the oxalic acid stock solution storage tank 2-1 is mixed with the pure water in the aqueous solution storage tank 2-2 (precise ratio is 2.5% oxalic acid and 40% aqueous solution). The mixture is then sent to the mixing tank 3-1 through the mixing pipeline 2-4 from the oxalic acid solution inlet pipe 3-7. At the same time, the cashew shell liquid supply pump group 11 sends the preheated cashew shell liquid from the cashew shell liquid storage tank 1-1 through the raw material discharge pipe 1-4 and the cashew shell liquid inlet pipe 3-3 into the mixing tank 3-1. The central control cabinet 9 supplies frequency conversion current to the outer stator 3-8 of the coil, which drives the rotor magnetic sheet 3-10 on the frame to rotate through electromagnetic induction. This, in turn, drives the mixing roller frame 3-9 to perform non-contact stirring and mixing of the two raw materials in the mixing tank 3-1. At the same time, the oil cooling and heating control pump group 5-1 of the preheating structure 5 sends the temperature-controlled heat transfer oil through the oil supply pipeline 5-2 into the oil circulation jacket 3-13 on the side wall of the mixing tank 3-1 to precisely control the temperature of the mixing system. The heat transfer oil is returned through the oil circuit pipeline 5-3 to complete the circulation. The uniformly mixed material is discharged from the mixed liquid discharge pipe 3-4 and sent to the impurity filter 4 to filter out solid impurities, colloids generated by the oxalic acid reaction, and other impurities to avoid clogging the subsequent reactor.

[0042] After being filtered, the semi-finished raw materials are pressurized by the shell liquid supply pump group 11 and sent to the shell liquid diversion pipeline 7-1 through the three-way valve supply pipeline 7-3. The electrically controlled valves 14 on the pipelines of the corresponding number of individual tubular reactors 7-2 can be opened according to the production load to realize parallel production of multiple reactors or individual maintenance and production of a single reactor, flexibly adapting to different production needs. After the raw materials enter each individual tubular reactor 7-2, the vacuum pump group 6 maintains a stable negative pressure reaction environment inside the reaction tube 72-1 through the vacuum diversion pipeline 6-1 and the single reactor vacuum pipeline 6-2. The secondary stable heating structure 8 sends constant temperature heat transfer oil through the oil diversion pipeline 8-1 and the single reactor oil supply pipeline 8-2 into the oil circulation jacket 3-13 on the side wall of the reaction tube 72-1, accurately and stably controlling the internal temperature of the reaction tube at 126±1℃. The raw materials flow through the catalyst filling core 72-7 filled with a low-temperature adapted Ce-Cu molded solid catalyst. Under the action of the solid catalyst, the unsaturated phenolic acids of cashew shell oil in the cashew shell liquid undergo a highly efficient decarboxylation reaction to generate a mixture of cashew phenols.

[0043] After the reaction is complete, the central control cabinet 9 controls the opening of the single-control valve 13-1, starting the extraction pump 13-2. This allows the decarboxylated cashew phenol mixture to be extracted and collected from the unit, completing the entire decarboxylation production process. This unit enables continuous and stable production. The design of multiple single-unit tubular reactors with independent temperature and pressure control provides high production flexibility. The low-temperature decarboxylation process effectively reduces the incidence of side reactions and improves the yield and quality of the cashew phenol product.

[0044] The above description represents a preferred embodiment of the present invention. For those skilled in the art, any changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of the present invention, based on the teachings of the present invention, still fall within the protection scope of the present invention.

Claims

1. A device for efficient decarboxylation of cashew nut shell liquid to generate a cashew phenol mixture, characterized in that, The system includes a cashew nut shell liquid storage structure (1), an oxalic acid solution mixing structure (2), a continuous static mixing structure (3), an impurity filter (4), a preheating structure (5), a vacuum pump group (6), a decarboxylation reactor (7), a secondary stable heating structure (8), a central control cabinet (9), and electrical control wiring (10). The cashew nut shell liquid storage structure (1) and the oxalic acid solution mixing structure (2) are arranged side by side, and the cashew nut shell liquid storage structure (1) and the oxalic acid solution mixing structure (2) are connected to the rear side of the continuous static mixing structure (3). The preheating structure (5) is connected to the continuous static mixing structure (3). The impurity filter (4) is connected to the front side of the continuous static mixing structure (3). The vacuum pump group (6) and the secondary stable heating structure (8) are respectively connected to the decarboxylation reactor (7). The front side of the impurity filter (4) is connected to the rear side of the decarboxylation reactor (7). The cashew shell liquid storage structure (1), oxalic acid solution proportioning structure (2), continuous static mixing structure (3), impurity filter (4), preheating structure (5), vacuum pump group (6), decarboxylation reactor (7), and secondary stable heating structure (8) are all connected to the central control cabinet (9) through electrical control wires (10).

2. The apparatus for high-efficiency decarboxylation of cashew nut shell liquid to generate a cashew phenol mixture according to claim 1, characterized in that, The oxalic acid solution mixing structure (2) consists of an oxalic acid stock solution storage tank (2-1), an aqueous solution storage tank (2-2), a precision mixing pump (2-3), and a mixing pipeline (2-4). The oxalic acid stock solution storage tank (2-1) and the aqueous solution storage tank (2-2) are arranged side by side. The precision mixing pump (2-3) is connected to the front side of the oxalic acid stock solution storage tank (2-1) and the aqueous solution storage tank (2-2), respectively. The rear end of the mixing pipeline (2-4) is connected to two sets of precision mixing pumps (2-3), respectively. The front end of the mixing pipeline (2-4) is connected to the continuous static mixing structure (3). The preheating structure (5) consists of an oil heating and cooling control pump group (5-1), an oil supply pipeline (5-2), and an oil return pipeline (5-3). The oil supply pipeline (5-1) is connected to the front end of the mixing pipeline (2-2), respectively. 2) The oil circuit pipeline (5-3) is connected to the oil cooling and heating control pump group (5-1) respectively, and the oil circuit pipeline (5-3) and the oil supply pipeline (5-2) are connected to the upper and lower sides of the continuous static mixing structure (3) respectively. The discharge end of the cashew shell liquid storage structure (1) is connected to the cashew shell liquid supply pump group (11). The end of the cashew shell liquid supply pump group (11) is connected to the rear side of the continuous static mixing structure (3). The oxalic acid stock solution storage tank (2-1), the aqueous solution storage tank (2-2), and the upper part of the cashew shell liquid storage structure (1) are all equipped with tank pressure balance valves (12). The precision proportioning pump (2-3), the oil cooling and heating control pump group (5-1), and the cashew shell liquid supply pump group (11) are all connected to the central control cabinet (9) through electrical control wires (10).

3. The apparatus for high-efficiency decarboxylation of cashew nut shell liquid to generate a cashew phenol mixture according to claim 1, characterized in that, The impurity filter (4) is connected in series between the decarboxylation reactor (7) and the continuous static mixing structure (3), and a shell liquid supply pump group (11) is connected in series behind the impurity filter (4). A finished product extraction pump group (13) is connected in parallel between the shell liquid supply pump group (11) and the decarboxylation reactor (7). A vacuum split line (6-1) and a single reactor vacuum line (6-2) are provided between the vacuum pump group (6) and the decarboxylation reactor (7). The vacuum split line (6-1) is connected to the end of the vacuum pump group (6). A single reactor vacuum line (6-2) is connected between the decarboxylation reactor (7) and the vacuum split line (6-1). The secondary stable heating structure (8) is connected to the decarboxylation reactor (7). The system is equipped with an oil diversion pipeline (8-1), a single-reactor oil supply pipeline (8-2), and a single-reactor oil return pipeline (8-3). The single-reactor oil supply pipeline (8-2) and the single-reactor oil return pipeline (8-3) are connected between the secondary stable heating structure (8) and the decarboxylation reactor (7). Each single-reactor vacuum pipeline (6-2) on the vacuum diversion pipeline (6-1) is equipped with an electrically controlled valve (14) at its connection end. The single-reactor oil supply pipeline (8-2) on the oil diversion pipeline (8-1) is also equipped with an electrically controlled valve (14) at its connection end. The electrically controlled valve (14) and the shell liquid supply pump group (11) are all connected to the central control cabinet (9) via electrical control wires (10).

4. The apparatus for efficient decarboxylation of cashew nut shell liquid to generate a cashew phenol mixture according to claim 2, characterized in that, The cashew nut shell liquid storage structure (1) consists of a cashew nut shell liquid storage tank (1-1), an external insulation layer (1-2), a valved inlet pipe (1-3), a raw material discharge pipe (1-4), a temperature and pressure detection probe (1-5), and an internal electric heating plate (1-6). The internal electric heating plate (1-6) is fixed to the inner bottom of the cashew nut shell liquid storage tank (1-1). The external insulation layer (1-2) covers the outer wall of the cashew nut shell liquid storage tank (1-1). The valved inlet pipe (1-3) is connected to the rear top side of the cashew nut shell liquid storage tank (1-1). The raw material... The discharge pipe (1-4) is connected to the bottom front end of the fruit shell liquid storage tank (1-1). The temperature and pressure detection probes (1-5) are arranged on the inner wall of the fruit shell liquid storage tank (1-1). The tank pressure balance valve (12) is located at the top of the fruit shell liquid storage tank. The valved input pipe (1-3), temperature and pressure detection probes (1-5), and internal electric heating grid (1-6) are all connected to the central control cabinet (9) through electrical control wires (10). The rear end of the raw material discharge pipe (1-4) is connected to the continuous static mixing structure (3) through the fruit shell liquid supply pump group (11).

5. The apparatus for efficient decarboxylation of cashew nut shell liquid to generate a cashew phenol mixture according to claim 4, characterized in that, The continuous static mixing structure (3) consists of a mixing tank (3-1), a tank support (3-2), a fruit shell liquid inlet pipe (3-3), a mixed liquid outlet pipe (3-4), a preheating inlet pipe (3-5), a preheating outlet pipe (3-6), an oxalic acid solution inlet pipe (3-7), an outer stator of the coil (3-8), a mixing roller frame (3-9), rotor magnetic plates on the frame (3-10), a double-end bearing of the mixing frame (3-11), and a temperature and pressure probe (3-12). The tank support (3-2) is fixed to the outer bottom side of the mixing tank (3-1). The fruit shell liquid inlet pipe (3-3) is connected to the center of the rear side of the mixing tank (3-1), the oxalic acid solution inlet pipe (3-7) is connected to the rear side of the mixing tank (3-1), the mixed liquid outlet pipe (3-4) is connected to the bottom side of the mixing tank (3-1), the side wall of the mixing tank (3-1) is provided with an oil circulation jacket (3-13), the preheating inlet pipe (3-5) and the preheating outlet pipe (3-6) are respectively connected to the upper and lower sides of the oil circulation jacket (3-13), and the mixing frame has a double-end bearing (3-11). The mixing roller frame (3-9) is respectively installed at both ends inside the mixing tank (3-1). It is mounted on two sets of double-end bearings. The outer stator of the coil (3-8) is fixed in the middle section of the mixing tank (3-1). The rotor magnetic plates (3-10) on the frame are arranged at equal circumferential angles and fixed on the outer side of the middle section of the mixing roller frame (3-9). The rotor magnetic plates (3-10) on the frame and the outer stator of the coil (3-8) are electromagnetically connected. The temperature and pressure probes (3-12) are arranged in the oil circulation jacket (3-13) and the mixing tank. On the side wall of the body (3-1), the outer stator of the coil (3-8) and the temperature and pressure probe (3-12) are connected to the central control cabinet (9) through the electrical control wire (10). The preheating inlet pipe (3-5) and the preheating outlet pipe (3-6) are connected to the oil supply line (5-2) and the oil circuit line (5-3) respectively. The front end of the shell liquid inlet pipe (3-3) is connected to the raw material outlet pipe (1-4) on the front side of the shell liquid storage tank (1-1) through the shell liquid supply pump group (11). The mixed liquid outlet pipe (3-4) is connected to the impurity filter (4).

6. The apparatus for high-efficiency decarboxylation of cashew nut shell liquid to generate a cashew phenol mixture according to claim 3, characterized in that, The decarboxylation reactor (7) consists of a shell liquid distribution pipeline (7-1), individual tubular reactors (7-2), and a three-way valved supply pipeline (7-3). The individual tubular reactors (7-2) are arranged in a row, and multiple sets of individual tubular reactors (7-2) are respectively connected to the end of the shell liquid distribution pipeline (7-1). The shell liquid distribution pipeline (7-1) is equipped with an electrically controlled valve (14). The three-way valved supply pipeline (7-3) is connected to the beginning of the shell liquid distribution pipeline (7-1). The three-way valved supply pipeline (7-3) is connected in series to the shell liquid supply pump group (11) at the rear end of the impurity filter (4). The finished product is pumped... The pump assembly (13) consists of a single-control valve (13-1) and a pump (13-2). The single-control valve (13-1) is connected to the bottom of the three-way valve supply line (7-3). The pump (13-2) is connected in series to the bottom of the single-control valve (13-1). The single reactor oil supply line (8-2), the single reactor oil circuit line (8-3), and the single reactor vacuum line (6-2) are connected to the single tubular reactor (7-2). The single tubular reactor (7-2), the three-way valve supply line (7-3), and the electrically controlled valve (14) are all connected to the central control cabinet (9) through the electrical control wire (10).

7. The apparatus for efficient decarboxylation of cashew nut shell liquid to generate a cashew phenol mixture according to claim 6, characterized in that, The single-unit tubular reactor (7-2) consists of a reaction tube (72-1), a tube end cap (72-2), an oil inlet pipe (72-3), an oil outlet pipe (72-4), a semi-liquid inlet pipe (72-5), a vacuum inlet pipe (72-6), a catalyst filling core (72-7), an inner core tube support (72-8), a sealing gasket (72-9), and a temperature and pressure probe (3-12). The side wall of the reaction tube (72-1) is provided with an oil circulation jacket. (3-13), the oil inlet pipe (72-3) and oil outlet pipe (72-4) are connected to the upper and lower sides of the oil circulation jacket (3-13) respectively. The pipe end cap (72-2) is sealed to the rear end of the reaction tube (72-1) by a sealing gasket (72-9). The vacuum inlet pipe (72-6) is connected to the top side of the reaction tube (72-1). The inner core tube support (72-8) is fixed inside the middle section of the reaction tube (72-1). The catalyst filling core (72-7) is sealed to the center of the pipe end cap (72-2) via a sealing gasket (72-9), and the middle section of the catalyst filling core (72-7) is fixed to the inner core tube support (72-8). The temperature and pressure probes (3-12) are arranged inside the inner wall of the reaction tube (72-1) and the side wall of the oil circulation jacket (3-13). The semi-liquid inlet pipe (72-5) is connected to the pipe end cap (72-2). The rear end of the liquid inlet pipe (72-5) is connected to the fruit shell liquid distribution pipeline (7-1). The oil inlet pipe (72-3) and oil outlet pipe (72-4) are connected to the single reactor oil supply pipeline (8-2) and the single reactor oil loop pipeline (8-3), respectively. The vacuum inlet pipe (72-6) is connected to the single reactor vacuum pipeline (6-2). The temperature and pressure probe (3-12) is connected to the central control cabinet (9) through the electrical control wire (10).

8. The apparatus for efficient decarboxylation of cashew nut shell liquid to generate a cashew phenol mixture according to claim 7, characterized in that, The internal temperature accuracy of the circulating oil regulating reaction tube (72-1) of the preheating structure (5) and the secondary stable heating structure (8) is 126±1℃. The catalyst filling core (72-7) is filled with low-temperature adapted Ce-Cu shaped solid catalyst.

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