A toluene insoluble matter experimental device and toluene recovery method

Abstract

The present invention discloses a toluene insoluble matter experimental device with a recycling function, comprising a liquid adding device, a recycling device, an exhaust gas filtering device and an experimental device, characterized in that: the experimental device comprises a condensing device, a reaction device and an evaporating device; the condensing device is connected to the reaction device, and the reaction device is connected to the evaporating device; the liquid adding device and the recycling device are connected to the experimental device; the experimental device is arranged in a reaction chamber; a liquid adding port is arranged on the shell of the experimental device; the reaction chamber and the recycling device are connected to the exhaust gas filtering device. The device has a simple structure and has the function of filtering and treating volatile gases in spaces such as the reaction chamber to avoid unorganized emissions; the device can be modularized into multiple units connected in parallel, which greatly reduces the requirements for operators, and the experiment is fully automated, which reduces the contact time of personnel with toluene solvent, protects the health of operators, and plays an important role in occupational disease prevention.

Description

Technical Field

[0001] The invention belongs to the field of analytical instruments, and in particular relates to a toluene insoluble matter experimental device with a recovery function and a toluene recovery method. Background Art

[0002] According to the existing technical standards, when conducting insoluble and soluble experiments using toluene solution as a solvent, a toluene solution that meets the standard liquid level must be added to the reaction vessel as a dissolving solvent for each experiment. After the experiment is completed, the remaining liquid contains a mixed liquid consisting of a mixture of toluene solution and a mixture of toluene solution. The existing technology has no ability to recover the toluene solution in the remaining liquid. After continuing to use the mixed liquid to conduct toluene dissolution experiments for several times, the mixed solution must be discarded. Some even directly discard the mixed liquid after one experiment, which not only causes a waste of experimental resources, but also the processing and production of toluene solution will pollute the environment, indirectly polluting the environment.

[0003] In the process of performing standard experiments, operators are constantly exposed to toluene solution and toxic and harmful volatile gases produced during the dissolution process, such as preparing for the experiment, adding toluene to dissolve, extracting filter paper, and handling the waste mixed liquid until the experiment is completed. These gases will cause health hazards to operators for a long time. Moreover, in the non-toxic and harmless treatment of toluene solution and toxic and harmful volatile gases produced by toluene dissolution, any omission in any step will lead to the unorganized emission of these gases, endangering the surrounding air environment and polluting the atmosphere.

[0004] In the current experiments on toluene dissolution, the experimental solvents and solutions are flammable items, which pose a safety hazard. The experimental process requires the operator to be extra careful, so the requirements for the operator are high; the experimental preparation work is cumbersome, which will take up a lot of the operator's time, which relatively reduces the number of experiments done in a day, making each experimental cycle longer; multiple experiments cannot be carried out at the same time, although the toluene solvent experimental equipment is the same, it does not have a flexible experimental structure; only one experiment can be carried out on one laboratory table, and the work efficiency is low. Summary of the invention

[0005] In order to overcome the defects of toluene solvent waste in toluene solvent experiments in the prior art, environmental pollution caused by mixed solutions and experimental volatile gases, and complicated experimental structure and low efficiency, the present invention provides a toluene insoluble matter experimental device with recovery function and a toluene recovery method, and the experimental device can realize full automation of the experimental process.

[0006] The toluene insoluble matter experimental device provided by the present invention comprises a liquid adding device, a recovery device, an exhaust gas filtering device and an experimental device, wherein the experimental device comprises a condensing device, a reaction device and an evaporating device; the condensing device is connected to the reaction device, and the reaction device is connected to the evaporating device; the liquid adding device and the recovery device are connected to the experimental device; the experimental device is arranged in a reaction bin; a liquid adding port is arranged on the outer shell of the experimental device; the reaction bin and the recovery device are connected to the exhaust gas filtering device.

[0007] As a better choice of the above device, the toluene insoluble matter experimental device also includes a sealed cylinder, and the sealed cylinder is connected to at least one of the condensing device, the reaction device and the evaporation device. For example, the reaction device and the condensing device can be connected to the sealed cylinder, or the evaporation device can be connected to the sealed cylinder.

[0008] As a better choice of the above device, the toluene insoluble matter experimental device further comprises a sealing member. The sealing member is arranged at a sealing position, such as when a sealing cylinder is selected to be connected to the condensing device, the sealing member can be arranged at the interface between the condensing device and the reaction device.

[0009] As a better choice of the above device, the liquid filling port of the recovery device and the liquid filling port of the liquid filling device are connected to the experimental device through a liquid filling port arranged on the shell of the experimental device.

[0010] As a better choice of the above device, the toluene insoluble matter experimental device is pneumatically driven.

[0011] As a better choice of the above device, the toluene insoluble matter experimental device includes a first peristaltic pump, the recovery device is connected to the first peristaltic pump, and the liquid outlet of the first peristaltic pump is connected to the experimental device.

[0012] As a better choice of the above device, the liquid adding device includes a second peristaltic pump, the second peristaltic pump is connected to the toluene container, and the liquid outlet of the second peristaltic pump is connected to the experimental device.

[0013] As a better choice of the above device, the liquid adding accuracy of the first peristaltic pump and the second peristaltic pump is 0.01 mL.

[0014] As a better choice of the above device, the toluene insoluble matter experimental device further includes a preheating device, and the preheating device is arranged at the front end of the liquid filling port of the experimental device.

[0015] As a better choice for the above device, the evaporation system includes a heating vessel and a bottom heater, and the bottom heater provides a stable heat source for the heating vessel. The heating vessel can be replaced after the experiment is completed; for example, the process of liquid recovery in the experiment: the bottom heater heats the remaining mixed solution after the experiment, and waits for all the liquid to evaporate; the remaining soluble matter in the heating vessel after volatilization is placed in a designated solid waste collection area, so as to achieve the separation of toluene solution and soluble matter, and the soluble matter separated by volatilization is centrally processed to avoid environmental pollution.

[0016] The present invention also provides a method for recovering toluene solution using the above device, which is achieved by heating the mixed solution to convert the toluene solution in the mixed liquid into toluene vapor, and then collecting the evaporated toluene vapor after condensation in a condenser.

[0017] As a better choice of the above-mentioned device, the recovery device also includes a liquid level alarm device; the liquid level alarm device sends out an alarm when the liquid stored in the inner cavity of the recovery device is insufficient for the experiment; further, a signal relay main control device can be set up, when the liquid level alarm device gives a signal of insufficient liquid level, the main control device receives the signal and replenishes the missing part of the toluene solvent in the next experiment.

[0018] As a better choice for the above device, the device also includes a gas concentration monitoring device, which is arranged in the recovery device. It can detect the concentration of volatile gases in the recovery device and start when it reaches a dangerous state; when the recovery function is started, the evaporation system works to heat the remaining mixed solution in the heating vessel. According to the different temperatures required for the liquid in the mixed solution to evaporate, the boiling point of toluene is 110.6°C under standard atmospheric pressure, and the temperature control accuracy of the bottom heater on the heating vessel can reach ±0.5°C, which is different from the temperature of the soluble matter dissolved in it, so as to separate the toluene solvent we want to extract and recover; for soluble matter with a boiling point lower than that of the toluene solution, the bottom heater uses step-by-step heating, the condensation system and the exhaust gas filtration system to make the gas that evaporates earlier than toluene be discharged first and filtered through the exhaust gas filtration system.

[0019] As a better choice of the above device, the device also includes a pneumatic fluid control device arranged between the reaction device and the recovery device. The pneumatic fluid control device is a part of the reaction device. When the reaction device is in different experimental stages, the flow of fluid in the recovery device is controlled by the action of the cylinder.

[0020] As a better choice of the above device, the reaction device includes a reaction vessel and a sensor, the reaction vessel includes a siphon, and the sensor is located on the siphon, which can monitor the flow state of the solution.

[0021] As a better choice for the above device, the device connects the reaction chamber and the recovery device to the exhaust gas system. After the gas enters the reaction chamber and the recovery device, it is converted into non-toxic and harmless gas when discharged, ensuring that the exhaust gas will not be discharged in an unorganized manner during the experiment.

[0022] The present invention also provides a toluene insoluble matter determination device group, which includes more than two toluene insoluble matter determination devices, and each toluene insoluble matter determination device includes a parallel interface. The parallel interface can realize the rapid connection of cooling water circulation, pneumatics, exhaust gas filtration, control system, etc. without affecting each other when multiple devices are connected in parallel, without affecting the fully automated operation of each device, reducing the workload of the operator, and allowing one operator to conduct experiments on multiple devices.

[0023] The present invention utilizes a recovery device in the device to separate the soluble matter and the solvent in the experimental mixed liquid, thereby realizing the reuse of the solvent and reducing unnecessary waste of the experimental solvent and pollution to the environment; the evaporation device of the present invention not only heats the experimental liquid during the reaction process, but also collects the soluble residues by using a heating vessel after the solvent is recovered after the experiment. The soluble residues only need to be placed in a designated collection place, thereby avoiding environmental pollution caused by improper treatment of the mixed solution.

[0024] This instrument is suitable for testing devices with toluene as the solvent. On the basis of complying with the standard experimental process, the present invention connects multiple devices in parallel, realizes the modularization of the experimental device, and can increase the experimental device at any time according to the demand; it solves the filtering, recovery and collection of gases, solvents, residues and the like in the experimental process, and the whole experimental process is automated, non-toxic and harmless. The operator only needs to input fixed instructions to conduct the experiment, which reduces the working time of the operator, reduces the requirements for the operator, and eliminates the physical harm of toxic and harmful substances to the operator.

[0025] The instrument has a simple and reliable structure, which greatly shortens the time taken by the experimental process and improves work efficiency. The experimental process is fully automated, avoiding unorganized emissions and physical harm caused by long-term contact of operators with chemical reagents. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 , a structural schematic diagram of a toluene solvent testing device with recovery function.

[0027] Figure 2 , a functional structural diagram of a toluene solvent testing device with recovery function.

[0028] Figure ID:

[0029] 1. Reaction chamber. DETAILED DESCRIPTION

[0030] The following is a preferred example of the invention, which is only used to illustrate the present application and is not intended to limit the present application.

[0031] See also Figure 1 The device of the present invention includes a condensing device, an evaporating device, a reaction device, a recovery device, and a liquid adding device. The condensing device is located above the reaction device, and the condensing device is connected to a sealed cylinder. A seal is provided below the condensing device, and a recovery device and a liquid adding pipeline of a liquid adding device are provided on the upper part of the seal. The liquid adding port is located above the pipeline. The reaction device is located above and connected to the evaporating device. The recovery device and the liquid adding device are each separately connected to a peristaltic pump, and then connected to the condensing device through a solution preheating device. A pneumatic liquid flow control device is provided in the middle of the connection between the reaction device and the recovery device. Interfaces are provided in the upper middle part of the reaction bin and the top of the recovery device to connect to the exhaust gas filtration system.

[0032] During the experiment, the condensing device, the recovery device, the liquid adding device, the pneumatic liquid flow control device, the evaporation device, the reaction device and the exhaust gas filtration system are operated according to the following steps:

[0033] 1. Place the prepared filter paper tube and test sample into the reaction vessel, close the sealing door of the reaction chamber, click on the experiment to start, and the exhaust gas filtration system will start working.

[0034] 2. The sealing cylinder works to lower the condensing device until the sealing member below the condensing device and the reaction vessel are sealed to the specified position.

[0035] 3. The peristaltic pump connected to the recovery device starts working, and the solvent liquid recovered from the last experiment is added (if the experiment is conducted for the first time, the system detects that there is no liquid in the recovery device, and starts the peristaltic pump above the liquid adding device, and adds liquid through the solution preheating device through the liquid adding port), preheats the solution through the solution preheating device through the pipeline, and finally adds it to the filter paper tube in the reaction vessel through the liquid adding port.

[0036] 4. After passing through the reaction chamber, the solvent flows into the heating vessel, the bottom heater starts to heat, the filtration experiment begins, and the sensor on the top of the siphon tube of the reaction vessel starts to work.

[0037] 5. After the filtration experiment is completed, the sealing cylinder works to lift the condensation device. The operator opens the sealing door, takes out the filter paper and the insoluble matter in the filter paper, and closes the sealing door (if you want to continue the experiment, you can directly put the filter paper and the sample into the reaction vessel).

[0038] 6. The solvent liquid begins to recover. First, the pneumatic liquid flow control device changes from the closed state to the open state and runs to the specified position. The bottom heater starts to work and heats the mixed solution to a temperature suitable for toluene evaporation. At this time, the bottom heater no longer increases the heat supply and maintains the existing temperature environment with an accuracy of ±0.5°C; it is condensed and falls into the reaction vessel through the condensing device, and then flows into the recovery device through the pipeline of the pneumatic liquid flow control device, etc., until there is no liquid in the heating vessel, the bottom heater stops working, the sealing cylinder works, the condensing device is separated from the reaction device, and the solvent recovery is completed.

[0039] 7. After the heating vessel has cooled down, there is no volatile gas such as solvent in the reaction chamber, the exhaust gas filtration system is automatically closed, open the sealed door to take out the heating vessel, and take the soluble residue in the experiment to the designated collection area for cleaning.

[0040] See also Figure 2 The device uses one-way signal control to preheat the solution, the peristaltic pump of the recovery device, the peristaltic pump of the liquid adding device and the sealing cylinder through the main control device, and executes actions according to the written program. Other units all use two-way transmission signals to control the work execution of the device at each stage.

[0041] The above are the working steps for each component in the experimental process, which ensures non-toxic and harmless treatment throughout the entire experimental process, the experimental process is fully automated, and the liquid recovery is fully automated, which reduces unnecessary waste and avoids physical harm to operators.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims

1. A toluene insoluble matter experimental device, comprising a liquid adding device, a recovery device, an exhaust gas filtering device and an experimental device, characterized in that: The experimental device comprises a condensing device, a reaction device and an evaporating device; the condensing device is connected to the reaction device, and the reaction device is connected to the evaporating device; the liquid adding device and the recovery device are connected to the experimental device; the experimental device is arranged in a reaction chamber; a liquid adding port is arranged on the shell of the experimental device; the reaction chamber and the recovery device are connected to the exhaust gas filtering device; The toluene insoluble matter experimental device further comprises a sealed cylinder, wherein the sealed cylinder is connected to at least one of the condensing device, the reaction device and the evaporating device; The toluene insoluble matter experimental device further comprises a sealing member, and the sealing member is arranged at the sealing position; The toluene insoluble matter experimental device comprises a first peristaltic pump, the recovery device is connected to the first peristaltic pump, and the liquid outlet of the first peristaltic pump is connected to the experimental device; The liquid adding device comprises a second peristaltic pump, the second peristaltic pump is connected to a toluene container, and a liquid outlet of the second peristaltic pump is connected to the experimental device; The toluene insoluble matter experimental device further comprises a preheating device, which is arranged at the front end of the liquid adding port of the experimental device; The recovery device also includes a liquid level alarm device; the liquid level alarm device sounds an alarm when the liquid stored in the inner cavity of the recovery device is insufficient for conducting the experiment; The evaporation system comprises a heating vessel and a bottom heater, wherein the bottom heater provides a stable heat source for the heating vessel.

2. The toluene insoluble matter experimental device according to claim 1, characterized in that: The liquid adding port of the recovery device and the liquid adding port of the liquid adding device are connected to the experimental device through the liquid adding port arranged on the shell of the experimental device.

3. The toluene insoluble matter experimental device according to claim 1, characterized in that: The toluene insoluble matter experimental device is pneumatically driven.

4. A toluene recovery method based on the toluene insoluble matter experimental device according to any one of claims 1 to 3, comprising: By heating the mixed solution to a specified temperature, the toluene in the solution is converted into toluene vapor and then separated from the toluene soluble matter, and then condensed and collected by a condenser to achieve reuse.

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