Apparatus and method for producing high performance plastic material feedstock

Abstract

The application relates to the technical field of plastic materials, and is a device for preparing high-performance plastic material raw materials and a purification method; the device comprises an evaporation device and a distillation tower; the gas outlet end of the evaporation device and the gas inlet end of the distillation tower are connected together through a gas inlet pipe, the gas outlet end of the distillation tower and the gas inlet end of a cooling device are connected together through a reflux pipe, and a liquid return pipe is connected between the liquid outlet end of the cooling device and the gas inlet pipe. The application separates and purifies styrene in plastic material raw material liquid by sequentially performing evaporation, distillation and cooling on the plastic material raw material liquid through the device, so that the purity of the purified styrene can reach 99.99%, high-quality raw materials are provided for the next process, the self-polymerization phenomenon of styrene and the content of phenylacetylene are greatly reduced, the styrene polymer prepared from the high-performance plastic material raw material liquid obtained by using the application has the characteristics of good heat resistance and chemical resistance, and the performance of the styrene polymer is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic materials, and is a device for preparing raw materials of high-performance plastic materials and a purification method. BACKGROUND

[0002] Distillation is an operation of separating a liquid mixture into components by heating and evaporating a raw liquid mixed by two or more liquids having different boiling points, and condensing a gas (or vapor) having a low boiling point. In the case where the relative volatility between the components of the mixture is very large, the components are easily separated. However, in the usual state, only a part of the liquid mixture can be separated by evaporation and condensation. Therefore, in the distillation technique, it is a general practice that a part of the condensed liquid is returned from the top of the distillation column (reflux), and the reflux liquid returned from the top of the column is brought into contact with the liquid mixture, so that the low boiling point component is discharged from the top of the distillation column, and the high boiling point component is discharged from the bottom of the column. The efficiency of the distillation column can be theoretically calculated depending on the specifications of the column, the flow rate and properties of the liquid and gas supplied to the column. However, in the conventional method and apparatus, it is sometimes impossible to obtain a certain level of distillation performance according to the theory, and in particular, if the diameter of the distillation column is large, or the surface tension of the supplied liquid is large, or the viscosity of the supplied liquid is high, or the supplied liquid has two or more properties of similar boiling points, it is difficult to quickly and accurately separate the mixture by distillation.

[0003] Most of the styrene produced industrially is manufactured from ethylbenzene in a continuous dehydrogenation process using either an adiabatic cracking process or an isothermal process, followed by separation of the styrene in the dehydrogenation reactor effluent. In the manufacture of monovinyl aromatic polymer compounds, benzene is reacted with ethylene to form ethylbenzene, which is then dehydrogenated to form a crude styrene product, which is subsequently purified to produce a styrene monomer product, which is then polymerized in the presence of an initiator or catalyst to form the final polystyrene feedstock. Residual monomer and other contaminants in the polymer associated with polystyrene result in poor quality of the produced material in terms of odor, color and performance, ultimately resulting in poor quality of the polymer.

[0004] Polystyrene often contains a significant amount of unreacted vinyl aromatic monomer, typically styrene monomer, which is unreacted due to the presence of phenylacetylene in the styrene feed which interferes with the polymerization. However, phenylacetylene is formed as an undesirable byproduct of the dehydrogenation of ethylbenzene to benzene, toluene, ethylbenzene, and xylene. Removal of these impurities cannot be accomplished by conventional distillation and has been a difficult problem to date. The presence of other impurities mixed in with the styrene monomer has adverse consequences regardless of whether the polymerization method used is anionic or free radical polymerization. In anionic polymerization, the slightly acidic phenylacetylene can consume a significant amount of catalyst, with each molecule of phenylacetylene consuming one molecule of catalyst from the polymerization process. This consumption results in difficulty in controlling the concentration of catalyst, which in turn results in difficulty in controlling the molecular weight of the polystyrene and can result in an increase in the concentration of low molecular weight polymers, or even unreacted styrene in the polystyrene. In free radical polymerization, the presence of phenylacetylene has an adverse effect on chain length and polymerization rate because it is a poor chain transfer agent. In free radical polymerization of styrene, the relative concentration of phenylacetylene and other impurities such as xylene naturally increases as the concentration of styrene decreases during the polymerization. The polymerization process is adversely affected due to the presence of phenylacetylene as a polymerization inhibitor. However, the polystyrene produced by free radical polymerization has a random configuration in its stereochemical structure, and the polystyrene having a random configuration has a problem of poor heat resistance and chemical resistance. Therefore, a large amount of residual styrene remains in the beads when manufacturing the expanded polystyrene beads. Styrene produces an undesirable taste, color, and odor even when present in only trace amounts in the polymer. Therefore, the presence of phenylacetylene in the styrene monomer has an adverse effect on cost, control of the polymerization process, and purity of the resulting polystyrene. The presence of phenylacetylene in the polystyrene also affects the olefinic bonds in the polymer backbone, which increases crosslinking and causes the polymer to oxidize more rapidly, both of which significantly affect the performance of the polymer. SUMMARY

[0005] The present application provides a device and a purification method for preparing a raw material of a high-performance plastic material, which overcomes the above-mentioned deficiencies of the prior art, and effectively solves the problem of poor performance of the subsequently prepared polymer due to the presence of phenylacetylene and low purity of styrene monomer in the raw material of the plastic material.

[0006] One of the technical solutions of the present application is realized by the following measures: a device for preparing high-performance plastic material raw materials, comprising an evaporation device, a distillation tower and a cooling device; an air outlet is arranged at the top of the evaporation device, an air inlet is arranged at the middle of the distillation tower, the air outlet of the evaporation device and the air inlet of the distillation tower are fixedly connected together through an air inlet pipe, a negative pressure port is arranged at the upper part of the distillation tower, a pressure reducing pump is fixedly connected to the negative pressure port of the distillation tower through a communication pipe, an air outlet is arranged at the top of the distillation tower, an air inlet is arranged at the upper part of the cooling device, the air outlet of the distillation tower and the air inlet of the cooling device are fixedly connected together through a reflux pipe, a liquid outlet is arranged at the bottom of the cooling device, a liquid return pipe is fixedly connected between the liquid outlet of the cooling device and the air inlet pipe, and valves are respectively fixedly installed on the liquid return pipe and the air inlet pipe.

[0007] The following is a further optimization or / and improvement of one of the above-mentioned technical solutions of the application:

[0008] The above-mentioned evaporation device is provided with a feed inlet at the upper part, a feed inlet pipe is fixedly connected to the feed inlet of the evaporation device, a discharge outlet is arranged at the bottom of the evaporation device, a discharge outlet pipe is fixedly connected to the discharge outlet of the evaporation device, and valves are respectively fixedly installed on the feed inlet pipe and the discharge outlet pipe.

[0009] The above-mentioned distillation tower is provided with a liquid outlet at the bottom, a liquid collector is arranged below the distillation tower, a liquid inlet is arranged at the top of the liquid collector, a liquid outlet is arranged at the bottom of the liquid collector, the liquid outlet of the distillation tower and the liquid inlet of the liquid collector are fixedly connected together through a liquid collecting pipe, a liquid outlet pipe is fixedly connected to the liquid outlet of the liquid collector, and valves are respectively fixedly installed on the liquid collecting pipe and the liquid outlet pipe.

[0010] The above-mentioned distillation tower is respectively provided with a thermometer and a pressure gauge at the top.

[0011] The above-mentioned evaporation device is provided with a heat exchange liquid inlet end at the left lower part, a heat conducting oil inlet pipe is fixedly connected to the heat exchange liquid inlet end of the evaporation device, a heat exchange liquid outlet end is arranged at the right upper part of the evaporation device, a heat conducting oil return pipe is fixedly connected to the heat exchange liquid outlet end of the evaporation device, and valves are respectively fixedly installed on the heat conducting oil inlet pipe and the heat conducting oil return pipe; the cooling device is provided with a cooling liquid inlet end at the left lower part, a cooling water inlet pipe is fixedly connected to the cooling liquid inlet end of the cooling device, a cooling liquid outlet end is arranged at the right upper part of the cooling device, a cooling water return pipe is fixedly connected to the cooling liquid outlet end of the cooling device, and valves are respectively fixedly installed on the cooling water inlet pipe and the cooling water return pipe.

[0012] The above-mentioned evaporation device is an evaporator; and the cooling device is a cooler.

[0013] The second technical solution of the present application is realized by the following measures: a purification method of preparing high-performance plastic material raw material, which is carried out according to the following steps: first, the plastic material raw material liquid is evaporated in an evaporation device, the evaporation temperature is 50-60 DEG C, the evaporation pressure is -0.095 Mpa to -0.1 Mpa, and the gas phase generated by evaporation enters a distillation column; second, the gas phase entering the distillation column is distilled by the distillation column, and the liquid phase is collected at the bottom of the distillation column, and the gas phase enters a cooling device from the top of the distillation column; third, the gas phase entering the cooling device is cooled to obtain a cooling liquid; fourth, the cooling liquid and the gas phase generated in the evaporation device are reversely contacted and heat-exchanged to re-enter the evaporation device; and fifth, the liquid phase collected at the bottom of the distillation column is collected to obtain the high-performance plastic material raw material liquid.

[0014] The following is a further optimization or / and improvement of the above-mentioned second technical solution of the application:

[0015] The above-mentioned plastic material raw material liquid is a styrene raw material liquid containing ethylbenzene, phenylacetylene, toluene and 4,6-dinitro-o-sec-butylphenol impurities.

[0016] The temperature in the above-mentioned cooling device is 20-25 DEG C, and the pressure in the cooling device is -0.095 Mpa to -0.1 Mpa.

[0017] The liquid level of the above-mentioned evaporation device is 1 / 3 to 2 / 3 of the volume of the evaporation device.

[0018] The present application realizes the separation and purification of styrene in the plastic material raw material liquid by sequentially evaporating, distilling and cooling the plastic material raw material liquid by using a device for preparing high-performance plastic material raw material, so that the purity of the purified styrene can reach 99.99%, which provides high-quality raw material for the next process, and greatly reduces the self-polymerization of styrene and the content of phenylacetylene. The styrene polymer prepared by using the high-performance plastic material raw material liquid obtained by the present application has the characteristics of good heat resistance and chemical resistance, and significantly improves the performance of the styrene polymer. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are attached. Figure 1 It is a process flow diagram of Example 1.

[0020] The codes in the drawings are as follows: 1 is an evaporation device, 2 is a distillation column, 3 is a cooling device, 4 is an air inlet pipe, 5 is a communication pipe, 6 is a vacuum pump, 7 is a reflux pipe, 8 is a liquid return pipe, 9 is a valve, 10 is a feed pipe, 11 is a discharge pipe, 12 is a liquid collector, 13 is a liquid collecting pipe, 14 is a liquid outlet pipe, 15 is a heat transfer oil inlet pipe, 16 is a heat transfer oil return pipe, 17 is a cooling water inlet pipe, and 18 is a cooling water return pipe. DETAILED DESCRIPTION

[0021] The present application is not limited by the following examples, and the specific implementation can be determined according to the technical solutions of the present application and the actual situation. In the present application, in order to facilitate the description, the relative position relationship of each component is described according to the layout direction of the drawings attached to the specification, such as: front, back, up, down, left, right, etc. The positional relationship is determined according to the layout direction of the drawings attached to the specification. Figure 1 Figure 1

[0022] The present application will be further described below in conjunction with the examples and drawings:

[0023] As shown in the accompanying drawings, the device for preparing high-performance plastic material raw materials of the present application comprises an evaporation device 1, a distillation column 2 and a cooling device 3. The evaporation device 1 is provided with an air outlet at the top, the distillation column 2 is provided with an air inlet at the middle, the air outlet of the evaporation device 1 and the air inlet of the distillation column 2 are fixedly connected together through an air inlet pipe 4, the distillation column 2 is provided with a negative pressure port at the upper part, a vacuum pump 6 is fixedly connected to the negative pressure port of the distillation column 2 through a communication pipe 5, the distillation column 2 is provided with an air outlet at the top, the cooling device 3 is provided with an air inlet at the upper part, the air outlet of the distillation column 2 and the air inlet of the cooling device 3 are fixedly connected together through a reflux pipe 7, the cooling device 3 is provided with a liquid outlet at the bottom, a liquid return pipe 8 is fixedly connected between the liquid outlet of the cooling device 3 and the air inlet pipe 4, and valves 9 are respectively fixedly installed on the liquid return pipe 8 and the air inlet pipe 4. The distillation column 2 is a commonly known and used device; SUS304 stainless steel material can be used as the inner shell of all distillation equipment, which has high working efficiency and is easy to clean; the distillation column 2 is internally provided with a plurality of stainless steel sieve plates with an inner diameter of 200 mm. The device for preparing high-performance plastic material raw materials of the present application sequentially evaporates, distills and cools the plastic material raw material liquid, thereby achieving the purpose of separating and purifying styrene in the plastic material raw material liquid. After purification, the purity can reach 99.99%, which provides high-quality raw materials for the next process, while greatly reducing the self-polymerization phenomenon of styrene and the content of phenylacetylene. The styrene polymer prepared from the high-performance plastic material raw material liquid obtained by using the present application has the characteristics of good heat resistance and chemical resistance, which significantly improves the performance of the styrene polymer. Figure 1 The above example 1 can be further optimized or / and improved according to actual needs:

[0024] As shown in the accompanying drawings, the device for preparing high-performance plastic material raw materials of the present application comprises an evaporation device 1, a distillation column 2 and a cooling device 3. The evaporation device 1 is provided with an air outlet at the top, the distillation column 2 is provided with an air inlet at the middle, the air outlet of the evaporation device 1 and the air inlet of the distillation column 2 are fixedly connected together through an air inlet pipe 4, the distillation column 2 is provided with a negative pressure port at the upper part, a vacuum pump 6 is fixedly connected to the negative pressure port of the distillation column 2 through a communication pipe 5, the distillation column 2 is provided with an air outlet at the top, the cooling device 3 is provided with an air inlet at the upper part, the air outlet of the distillation column 2 and the air inlet of the cooling device 3 are fixedly connected together through a reflux pipe 7, the cooling device 3 is provided with a liquid outlet at the bottom, a liquid return pipe 8 is fixedly connected between the liquid outlet of the cooling device 3 and the air inlet pipe 4, and valves 9 are respectively fixedly installed on the liquid return pipe 8 and the air inlet pipe 4. The distillation column 2 is a commonly known and used device; SUS304 stainless steel material can be used as the inner shell of all distillation equipment, which has high working efficiency and is easy to clean; the distillation column 2 is internally provided with a plurality of stainless steel sieve plates with an inner diameter of 200 mm. The device for preparing high-performance plastic material raw materials of the present application sequentially evaporates, distills and cools the plastic material raw material liquid, thereby achieving the purpose of separating and purifying styrene in the plastic material raw material liquid. After purification, the purity can reach 99.99%, which provides high-quality raw materials for the next process, while greatly reducing the self-polymerization phenomenon of styrene and the content of phenylacetylene. The styrene polymer prepared from the high-performance plastic material raw material liquid obtained by using the present application has the characteristics of good heat resistance and chemical resistance, which significantly improves the performance of the styrene polymer.

[0025] Figure 1 As shown in the accompanying drawings, the device for preparing high-performance plastic material raw materials of the present application comprises an evaporation device 1, a distillation column 2 and a cooling device 3. The evaporation device 1 is provided with an air outlet at the top, the distillation column 2 is provided with an air inlet at the middle, the air outlet of the evaporation device 1 and the air inlet of the distillation column 2 are fixedly connected together through an air inlet pipe 4, the distillation column 2 is provided with a negative pressure port at the upper part, a vacuum pump 6 is fixedly connected to the negative pressure port of the distillation column 2 through a communication pipe 5, the distillation column 2 is provided with an air outlet at the top, the cooling device 3 is provided with an air inlet at the upper part, the air outlet of the distillation column 2 and the air inlet of the cooling device 3 are fixedly connected together through a reflux pipe 7, the cooling device 3 is provided with a liquid outlet at the bottom, a liquid return pipe 8 is fixedly connected between the liquid outlet of the cooling device 3 and the air inlet pipe 4, and valves 9 are respectively fixedly installed on the liquid return pipe 8 and the air inlet pipe 4. The distillation column 2 is a commonly known and used device; SUS304 stainless steel material can be used as the inner shell of all distillation equipment, which has high working efficiency and is easy to clean; the distillation column 2 is internally provided with a plurality of stainless steel sieve plates with an inner diameter of 200 mm. The device for preparing high-performance plastic material raw materials of the present application sequentially evaporates, distills and cools the plastic material raw material liquid, thereby achieving the purpose of separating and purifying styrene in the plastic material raw material liquid. After purification, the purity can reach 99.99%, which provides high-quality raw materials for the next process, while greatly reducing the self-polymerization phenomenon of styrene and the content of phenylacetylene. The styrene polymer prepared from the high-performance plastic material raw material liquid obtained by using the present application has the characteristics of good heat resistance and chemical resistance, which significantly improves the performance of the styrene polymer. ​​​

[0026] As attached Figure 1 As shown, a liquid outlet is provided at the bottom of the distillation column 2, a liquid collector 12 is provided below the distillation column 2, a liquid inlet is provided at the top of the liquid collector 12, and a liquid outlet is provided at the bottom of the liquid collector 12. The liquid outlet of the distillation column 2 and the liquid inlet of the liquid collector 12 are fixedly connected together by a liquid collecting pipe 13. A liquid outlet pipe 14 is fixedly connected to the liquid outlet of the liquid collector 12. Valves 9 are fixedly installed on the liquid collecting pipe 13 and the liquid outlet pipe 14 respectively.

[0027] As needed, a thermometer and a pressure gauge are fixedly installed on the top of distillation column 2. The thermometer and pressure gauge facilitate real-time monitoring of temperature and pressure.

[0028] As attached Figure 1 As shown, a heat exchange liquid inlet is provided on the lower left side of the evaporator 1, and a heat transfer oil inlet pipe 15 is fixedly connected to the heat exchange liquid inlet of the evaporator 1. A heat exchange liquid outlet is provided on the upper right side of the evaporator 1, and a heat transfer oil return pipe 16 is fixedly connected to the heat exchange liquid outlet of the evaporator 1. Valves 9 are fixedly installed on the heat transfer oil inlet pipe 15 and the heat transfer oil return pipe 16, respectively. A coolant inlet is provided on the lower left side of the cooling device 3, and a cooling water inlet pipe 17 is fixedly connected to the coolant inlet of the cooling device 3. A coolant outlet is provided on the upper right side of the cooling device 3, and a cooling water return pipe 18 is fixedly connected to the coolant outlet of the cooling device 3. Valves 9 are fixedly installed on the cooling water inlet pipe 17 and the cooling water return pipe 18, respectively. Evaporation device 1 is a known and commonly used device with a double-layer structure, an inner liquid storage chamber and an outer heating chamber. The heat transfer oil inlet pipe 15 and the heat transfer oil return pipe 16 are respectively connected to the heating chamber. Cooling device 3 is also a known and commonly used device with a double-layer structure, an inner liquid storage chamber and an outer cooling chamber. The cooling water inlet pipe 17 and the cooling water return pipe 18 are respectively connected to the cooling chamber.

[0029] Depending on the requirements, evaporation device 1 is an evaporator; cooling device 3 is a cooler.

[0030] Example 2, as shown in the attached document Figure 1As shown, the purification method for preparing high-performance plastic material raw material is carried out according to the following steps: first, the plastic material raw material liquid is evaporated in the evaporation device 1, the evaporation temperature is 50-60 DEG C, the evaporation pressure is -0.095-0.1 Mpa, and the gas phase generated by evaporation enters the distillation column 2; second, the gas phase entering the distillation column 2 is distilled by the distillation column 2, the liquid phase is collected at the bottom of the distillation column 2, and the gas phase enters the cooling device 3 from the top of the distillation column 2; third, the gas phase entering the cooling device 3 is cooled to obtain a cooling liquid; fourth, the cooling liquid and the gas phase generated in the evaporation device 1 are reversely contacted and heat-exchanged to re-enter the evaporation device 1; and fifth, the liquid phase collected at the bottom of the distillation column 2 is obtained to obtain the high-performance plastic material raw material liquid. The plastic material raw material liquid (crude styrene) is evaporated, and then the styrene is purified and concentrated by vacuum distillation, and the vacuum distillation can keep the distillation temperature low and reduce the styrene self-polymerization to the maximum extent.

[0031] The plastic material raw material liquid is evaporated and then sent to the distillation column 2, the organic compounds with low boiling points are lifted through the distillation column 2, and then introduced into the cooling device 3 from the top of the distillation column 2, and then the cooling liquid re-enters the evaporation device 1 after being cooled by the cooling device 3; the organic compounds with high boiling points are collected at the bottom of the distillation column 2 and then extracted to the next step, and since the styrene is a compound that is easy to polymerize, a polymerization inhibitor such as hydroquinone can be usually added to the raw liquid.

[0032] The present application can also purify olefin aromatic mixtures, and the reduced pressure distillation method according to the present application can significantly reduce the high temperature required in the conventional distillation of the olefin aromatic mixture. By distilling the olefin aromatic mixture under reduced pressure according to the present application, the required temperature can be lower than that required in the conventional distillation under ambient pressure, and under these low-temperature distillation conditions, adverse chemical reactions that can occur when heated can be avoided. In addition, the reduced temperature of the reduced pressure distillation of the present application not only avoids the need for a large amount of heat for preheating the olefin aromatic mixture in the distillation device, but also reduces the heat loss of the system.

[0033] Example 3, as an optimization of the above-mentioned examples, the plastic material raw material liquid is a styrene raw material liquid containing ethylbenzene, phenylacetylene, toluene and 4,6-dinitro-o-sec-butylphenol impurities.

[0034] Example 4, as an optimization of the above-mentioned examples, the temperature in the cooling device 3 is 20-25 DEG C, and the pressure in the cooling device 3 is -0.095-0.1 Mpa.

[0035] Example 5, as an optimization of the above-mentioned examples, the liquid level of the evaporation device 1 is 1 / 3-2 / 3 of the volume of the evaporation device 1.

[0036] Example 6, as shown in the accompanying drawings Figure 1As shown, the purification method for preparing high-performance plastic material raw materials is carried out according to the following steps: First, the plastic material raw material liquid is evaporated in evaporation device 1 at an evaporation temperature of 60°C and an evaporation pressure of -0.095 MPa. The resulting gas phase enters distillation column 2. Second, after distillation in distillation column 2, the liquid phase accumulates at the bottom of distillation column 2, and the gas phase enters cooling device 3 from the top of distillation column 2. Third, the gas phase entering cooling device 3 is cooled to obtain coolant. Fourth, the coolant and the gas phase generated in evaporation device 1 are contacted in a counter-current manner and heat exchanged before the coolant re-enters evaporation device 1. Fifth, the liquid phase accumulated at the bottom of distillation column 2 is collected to obtain high-performance plastic material raw material liquid. The purity of the plastic material raw material is 99%, and the purity of the high-performance plastic material raw material liquid obtained after separation and purification in Example 6 is 99.5%.

[0037] Example 7, as shown in the appendix Figure 1 As shown, the purification method for preparing high-performance plastic material raw materials is carried out according to the following steps: First, the plastic material raw material liquid is evaporated in evaporation device 1 at an evaporation temperature of 55°C and an evaporation pressure of -0.1 MPa. The resulting gas phase enters distillation column 2. Second, after distillation in distillation column 2, the liquid phase accumulates at the bottom of distillation column 2, and the gas phase enters cooling device 3 from the top of distillation column 2. Third, the gas phase entering cooling device 3 is cooled to obtain coolant. Fourth, the coolant and the gas phase generated in evaporation device 1 are contacted in a counter-current manner and heat exchanged before the coolant re-enters evaporation device 1. Fifth, the liquid phase accumulated at the bottom of distillation column 2 is collected to obtain high-performance plastic material raw material liquid. The purity of the plastic material raw material is 99%, and the purity of the high-performance plastic material raw material liquid obtained after separation and purification in Example 7 is 99.7%.

[0038] This invention purifies and concentrates styrene through vacuum distillation. Vacuum distillation can maintain a low temperature inside the distillation column 2 and minimize the self-polymerization of styrene, thus greatly reducing the content of phenylacetylene.

[0039] In summary, this invention provides an apparatus for preparing high-performance plastic material raw materials. The apparatus sequentially evaporates, distills, and cools the plastic material raw material liquid, thereby achieving the separation and purification of styrene in the liquid. The purified purity can reach 99.99%, providing high-quality raw materials for the next process. Simultaneously, it significantly reduces styrene self-polymerization and the content of phenylacetylene. The styrene polymer prepared using the high-performance plastic material raw material liquid obtained by this invention exhibits good heat resistance and chemical resistance, significantly improving the performance of the styrene polymer.

[0040] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effects. Unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. An apparatus for preparing raw materials for high-performance plastic materials, characterized in that... It includes an evaporation unit, a distillation column, and a cooling unit. The evaporation unit has an outlet at the top, and the distillation column has an inlet in the middle. The outlet of the evaporation unit and the inlet of the distillation column are fixedly connected together by an inlet pipe. The upper part of the distillation column has a negative pressure port, and a pressure reducing pump is fixedly connected to the negative pressure port of the distillation column through a connecting pipe. The cooling unit has an inlet at the top, and the outlet of the distillation column and the inlet of the cooling unit are fixedly connected together by a reflux pipe. The cooling unit has a liquid outlet at the bottom, and a return pipe is fixedly connected between the liquid outlet of the cooling unit and the inlet pipe. Valves are fixedly installed on the return pipe and the inlet pipe, respectively.

2. The apparatus for preparing high-performance plastic material raw materials according to claim 1, characterized in that... The evaporator has a feed end at the top, and a feed pipe is fixedly connected to the feed end. The evaporator has a discharge end at the bottom, and a discharge pipe is fixedly connected to the discharge end. Valves are fixedly installed on the feed pipe and the discharge pipe respectively.

3. The apparatus for preparing high-performance plastic material raw materials according to claim 1 or 2, characterized in that... The distillation column has a liquid outlet at the bottom and a liquid collector at the bottom. The liquid collector has an inlet at the top and an outlet at the bottom. The liquid outlet of the distillation column and the inlet of the liquid collector are fixedly connected together by a liquid collecting pipe. An outlet pipe is fixedly connected to the liquid outlet of the liquid collector. Valves are fixedly installed on the liquid collecting pipe and the outlet pipe, respectively.

4. The apparatus for preparing high-performance plastic material raw materials according to claim 1 or 2, characterized in that... A thermometer and a pressure gauge are fixedly installed at the top of the distillation column.

5. An apparatus for preparing high-performance plastic material raw materials according to claim 1 or 2, characterized in that... The evaporator has a heat exchange liquid inlet on the lower left side, to which a heat transfer oil inlet pipe is fixedly connected. The evaporator has a heat exchange liquid outlet on the upper right side, to which a heat transfer oil return pipe is fixedly connected. Valves are fixedly installed on both the heat transfer oil inlet and return pipes. Similarly, the cooling device has a coolant inlet on the lower left side, to which a cooling water inlet pipe is fixedly connected. The cooling device has a coolant outlet on the upper right side, to which a cooling water return pipe is fixedly connected. Valves are fixedly installed on both the cooling water inlet and return pipes.

6. The apparatus for preparing high-performance plastic material raw materials according to claim 5, characterized in that... The evaporation device is an evaporator; the cooling device is a cooler.

7. A purification method for an apparatus for preparing high-performance plastic material raw materials according to claim 1, 2, or 3, characterized in that... The process is as follows: First, the plastic material raw material liquid is evaporated in an evaporation device at a temperature of 50°C to 60°C and an evaporation pressure of -0.095 MPa to -0.1 MPa. The resulting gas phase enters a distillation column. Second, after distillation, the liquid phase in the distillation column accumulates at the bottom, while the gas phase enters a cooling device from the top. Third, the gas phase in the cooling device is cooled to obtain a coolant. The fourth step involves the coolant and the gas phase generated in the evaporator coming into counter-current contact and exchanging heat before re-entering the evaporator. The fifth step is to collect the liquid phase that has accumulated at the bottom of the distillation column to obtain the raw material liquid for high-performance plastic materials.

8. The purification method of the apparatus for preparing high-performance plastic material raw materials according to claim 7, characterized in that... The plastic material raw material liquid is a styrene raw material liquid containing impurities such as ethylbenzene, phenylacetylene, toluene and 4,6-dinitro-o-sec-butylphenol.

9. The purification method of the apparatus for preparing high-performance plastic material raw materials according to claim 7 or 8, characterized in that... The temperature in the cooling device is 20℃ to 25℃, and the pressure in the cooling device is -0.095Mpa to -0.1Mpa.

10. The purification method of the apparatus for preparing high-performance plastic material raw materials according to claim 9, characterized in that... The liquid level in the evaporator is between 1 / 3 and 2 / 3 of the evaporator's volume.

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