CN210314086U - Catalyst desorption system for C5 petroleum resin production - Google Patents
Catalyst desorption system for C5 petroleum resin production Download PDFInfo
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- CN210314086U CN210314086U CN201920980319.3U CN201920980319U CN210314086U CN 210314086 U CN210314086 U CN 210314086U CN 201920980319 U CN201920980319 U CN 201920980319U CN 210314086 U CN210314086 U CN 210314086U
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Abstract
The utility model discloses a catalyst desorption system is used in production of C5 petroleum resin belongs to oil production technical field. It includes second grade washing settling cask and tertiary washing settling cask, still includes blender and circulating pump, and the discharge gate of second grade washing settling cask passes through the circulating pump and links to each other with the feed inlet of blender, and the discharge gate of blender passes through the pipeline and links to each other with the feed inlet of tertiary washing settling cask, and the blender still links to each other with the feed inlet of circulating pump through circulating line. Adopt the technical scheme of the utility model when taking off the processing of urging to C5 petroleum resin, can effectively guarantee polymerization liquid and hydrothermal intensive mixing to reinforcing washing effect is favorable to guaranteeing the quality of gained product.
Description
Technical Field
The utility model belongs to the technical field of petroleum resin production, more specifically say, relate to a catalyst desorption system for C5 petroleum resin production.
Background
The C5 petroleum resin is also called carbon five resin and aliphatic hydrocarbon resin, mainly uses carbon five petroleum resin fraction which is by-product of petroleum cracking as raw material, and is polymerized by catalyst to obtain a thermoplastic resin, which can be generally divided into 3 types of general type, mixed type and primary color transparent type, can be dissolved in various solvents such as acetone, trichloroethane, cyclohexane, toluene, solvent gasoline, etc., has good viscosity increasing property, heat resistance and acid and alkali resistance, and is widely used in the viscosity increasing resin of pressure-sensitive adhesive, hot-melt adhesive and rubber type adhesive.
At present, the production method of the C5 petroleum resin mainly comprises the following steps: the method comprises the steps of raw material pretreatment and configuration, catalytic polymerization, deactivation and washing catalysis, flash evaporation and desolventization, vacuum stripping, granulation and solvent recovery and separation, wherein the removal effect of the catalyst has great influence on the hue, transparency, ash content and ageing resistance of the C5 petroleum resin, so that the effective removal of the catalyst is a key link for synthesizing high-quality C5 petroleum resin. In the prior art, a polymerization solution obtained by a polymerization reaction is usually subjected to catalysis removal by a water washing method, the polymerization solution is subjected to water elution catalysis by a water washing stirring kettle, and then the catalyst in the polymerization solution is further removed by a first-stage, a second-stage and a third-stage water washing settling tanks. However, the existing water washing system is difficult to ensure the sufficient mixing of the polymer solution and the water washing solution, so that the water washing is not thorough, partial chloride ions remain in the polymer solution, and the pipeline and equipment of a subsequent system are corroded.
Through retrieval, the Chinese patent application number: 201520574795.7, filing date: in 2015, 07, 31 days, the invention is named as: a deactivation and removal system for C5 petroleum resin catalyst, in the application, a liquid outlet pipe of a polymerization liquid extraction pump is connected with an auxiliary agent supply pipe and a hot water supply pipe and then is converged into one path, and is connected with a feed inlet at the bottom of a water washing stirring kettle; a discharge hole at the top of the washing stirring kettle is connected with a feed inlet of the primary washing tank through a pipeline; a liquid outlet pipe at the top of the first-stage washing tank is connected with a hot water supply pipe and then is converged into one path, and the one path is connected with a feed inlet of the second-stage washing tank through a first mixer; the liquid outlet pipe at the top of the second-stage washing tank is connected with the hot water supply pipe and the ammonia water supply pipe and then is converged into one path, and the other path is connected with the third-stage washing tank through the second mixer. This application is through between one-level washing jar and second grade washing jar to and add the blender respectively between second grade washing jar and the tertiary washing jar, thereby can improve polymerization liquid and hydrothermal mixing uniformity to a certain extent, and then improve washing effect, nevertheless, because above-mentioned blender is static mixer, the volume is less, easily appears the phenomenon of jam in the actual production process, thereby leads to washing unit pressure to rise, influences the stability of water washing system.
SUMMERY OF THE UTILITY MODEL
1. Problems to be solved
The utility model aims to overcome and adopt current washing system to take off when urging the processing to C5 petroleum resin, the washing effect is relatively poor not enough, provides a catalyst desorption system for C5 petroleum resin production. Adopt the technical scheme of the utility model, can effectively guarantee polymerization liquid and hydrothermal intensive mixing to reinforcing washing effect is favorable to guaranteeing the quality of gained product.
2. Technical scheme
In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:
the utility model discloses a catalyst desorption system is used in production of C5 petroleum resin, including one-level washing settling cask, second grade washing settling cask, tertiary washing settling cask, vertical mixer and circulating pump, all be equipped with the boundary position meter on one-level washing settling cask and the second grade washing settling cask, and the discharge gate of one-level washing settling cask passes through the pipeline and links to each other with the feed inlet of second grade washing settling cask, and the discharge gate of second grade washing settling cask passes through the circulating pump and links to each other with the feed inlet of vertical mixer, and the discharge gate of vertical mixer links to each other through the feed inlet of pipeline with tertiary washing settling cask on the one hand, and on the other hand passes through the circulating line and.
Furthermore, the vertical mixer comprises a first mixer and a second mixer which are arranged in parallel, and pall ring packing is arranged in each mixer.
Furthermore, valves are arranged on the feeding and discharging pipelines of the mixer, the feeding pipe of the circulating pump and the circulating pipeline.
Furthermore, a feed inlet of the primary washing settling tank is respectively connected with a discharge outlet of the washing stirring kettle and a hot water pipe through pipelines.
Furthermore, the upper end and the lower end of the boundary level meter are respectively connected with the top and the bottom of the first-stage washing settling tank and the second-stage washing settling tank, and the bottoms of the first-stage washing settling tank and the second-stage washing settling tank are respectively provided with a waste water discharge pipe.
Furthermore, the lower end of the boundary level meter is connected with a liquid outlet of the hot water pipe through a hot water flushing pipe, and the upper and lower end pipelines of the boundary level meter and the hot water flushing pipe are provided with valves.
Furthermore, the discharge hole of the second-stage washing settling tank is connected with the feed inlet of the third-stage washing settling tank through a static mixer.
Furthermore, valves are arranged on the material inlet pipe and the material outlet pipe of the static mixer.
Furthermore, the discharge gate of tertiary washing settling cask passes through the pipeline and links to each other with one-level settling cask, second grade settling cask and tertiary settling cask respectively, and all is equipped with the boundary position meter on one-level, second grade and the tertiary settling cask.
Furthermore, the inlet pipe, the outlet pipe and the bottom wastewater pipe of the first-stage settling tank, the second-stage settling tank and the third-stage settling tank are respectively provided with a regulating valve, and all the regulating valves are configured in the DCS.
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a catalyst desorption system is used in production of C5 petroleum resin, including one-level washing settling cask, second grade washing settling cask, tertiary washing settling cask, vertical mixer and circulating pump, the polymerization liquid carries out the intensive mixing in getting into the vertical mixer together with hot water and alkali lye after one-level and second grade washing settling cask washing settlement treatment, later gets into tertiary washing settling cask again and handles. Through the setting of vertical mixer, its volume is great, and still is equipped with pall ring filler in the mixer to can effectively increase the area of contact of hot water and polymerization liquid, further improve the mixed effect of hot water and polymerization liquid, and then be favorable to improving the water washing effect, catalyst in can effectively the desorption polymerization liquid reduces the content of chloride ion in the polymerization liquid. In addition, still constitute circulation circuit through the pipeline between vertical mixer and the circulating pump to can carry out many times circulation to mix to aqueous solution and rinsing liquid, further improve the mixing uniformity of rinsing liquid and aqueous solution, be favorable to guaranteeing the water washing effect of aqueous solution and the quality of gained product.
(2) The utility model discloses a catalyst desorption system is used in production of C5 petroleum resin, vertical mixer including parallelly connected first blender and the second blender that sets up, two blender structures and mounting means homogeneous phase, the homoenergetic can circulate the mixture to the polymerization liquid and the washing liquid that get into, it advances, all is equipped with the valve on discharging pipe and the circulating line, the business turn over material and the circulation mixing operation of polymerization liquid are realized to switching through control flap. Simultaneously, two blenders set up to one and open one and be equipped with, during production, accessible valve switching comes control to use one of them blender, and another is as reserve, and the blender that drops into production usefulness needs the clearance or breaks down and need overhaul, and the switching of accessible valve realizes line change production fast, and is easy and simple to handle, can effectively strengthen the washing effect, has also improved production efficiency simultaneously.
(3) The utility model discloses a catalyst desorption system is used in production of C5 petroleum resin, one-level washing settling cask links to each other with washing stirred tank and hot-water line respectively, just still be equipped with the agitator among the washing stirred tank, can stir mixing back reentrant one-level washing settling cask to polymerization liquid and hot water earlier, still be equipped with the boundary position meter on the one-level washing settling cask, when adopting the boundary position meter to monitor the boundary position of liquid in the one-level washing settling cask, can realize the accurate control to one-level washing operation to ensure the washing effect. The lower end pipeline of the boundary level meter is also communicated with the hot water flushing pipe, the boundary level meter is flushed by hot water of the hot water flushing pipe, sticky polymer liquid can be effectively prevented from being adhered to the boundary level meter, the display of the boundary level meter is more accurate, meanwhile, the hot water flushing pipe is directly connected with the hot water pipe, the hot water for flushing the boundary level meter directly comes from the hot water pipe, a hot water supply source does not need to be additionally arranged, and the process pipeline preparation of a production site is reduced.
(4) The utility model discloses a catalyst desorption system is used in production of C5 petroleum resin, the discharge gate of second grade washing settling cask still links to each other with the feed inlet of tertiary washing settling cask through static mixer, when generally carrying out production, throw and carry out intensive mixing to polymer liquid and hot water with vertical mixer pipeline, when vertical mixer pipeline need overhaul, throw and mix with static mixer pipeline, be favorable to guaranteeing the continuity of production, and simultaneously, static mixer advances, all be equipped with the valve on the discharging pipe, come the selection pipeline through the control flap switching to mix polymer liquid and hot water, and convenient for operation can realize the manual work or the automatic control of washing operation.
(5) The utility model discloses a catalyst desorption system is used in production of C5 petroleum resin, the discharge gate of tertiary washing settling cask passes through the pipeline and links to each other with one-level settling cask, second grade settling cask and tertiary settling cask respectively, through set up the boundary meter on three settling cask and advance, set up the governing valve on discharging pipe and the bottom waste pipe, and all governing valves all are the configuration in the DCS, and link to each other with the boundary meter and lock, thereby can come automatic control settling cask's feeding and ejection of compact according to the liquid level of resin polymerization liquid in the settling cask, and can control three settling cask and carry out feeding respectively in turn, the ejection of compact and the settlement operation of stewing, thereby the settlement dwell time of resin liquid has been prolonged greatly, the Al (OH) that has guaranteed to wash in-process production3Effectively removing the residues and the residual water, and improving the quality of the C5 petroleum resin finished product.
Drawings
FIG. 1 is a schematic structural diagram of a catalyst removal system for C5 petroleum resin production according to the present invention;
in the figure: 1. a hot water pipe; 2. washing the stirred tank with water; 3. a first-stage washing settling tank; 4. a static mixer; 5. a third-stage washing settling tank; 6. a circulation pipe; 7. a second mixer; 8. a first mixer; 9. a circulation pump; 10. a secondary washing settling tank; 11. A boundary position meter; 12. a waste water discharge pipe; 13. a hot water flushing pipe; 14. a primary settling tank; 15. a secondary settling tank; 16. a third-stage settling tank; 17. a stirrer.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
Example 1
As shown in fig. 1, the catalyst removal system for C5 petroleum resin production of this embodiment includes a first-stage washing settling tank 3, a second-stage washing settling tank 10, a third-stage washing settling tank 5, a vertical mixer and a circulating pump 9, wherein a feed inlet of the first-stage washing settling tank 3 is connected to a discharge outlet of the washing stirring kettle 2 and a hot water pipe 1 through a pipeline, respectively, and a discharge outlet thereof is connected to the second-stage washing settling tank 10 through a pipeline; the discharge gate of second grade washing settling cask 10 passes through circulating pump 9 and links to each other with vertical mixer's feed inlet, and vertical mixer's discharge gate links to each other through the feed inlet of pipeline with tertiary washing settling cask 5 on the one hand, and on the other hand passes through circulating line 6 and links to each other with circulating pump 9's feed inlet.
Polymerization liquid and hot water mix through washing stirred tank 2, and still be equipped with agitator 17 in the washing stirred tank 2, a mixing effect for improving polymerization liquid and hot water, then carry out the washing in getting into one-level washing settling cask 3, can desorption most catalyst after the one-level washing usually, the rethread gets into second grade washing settlement 10 and further takes off the catalyst in tertiary washing settling cask 5 in proper order, setting through tertiary washing, catalyst in the polymerization liquid can fully be got rid of, it causes the corruption to pipeline and equipment to avoid remaining catalyst to get into subsequent system. However, in the prior art, the lotion and the polymer solution are difficult to be fully mixed, so that the polymer solution is not thoroughly washed and settled in the washing and settling tank, the effect is poor, chloride ions remain, and subsequent equipment and pipelines are corroded.
The original method of the applicant is to arrange an SV type static mixer (small) between a second-level washing settling tank 10 and a third-level washing settling tank 5 for fully mixing hot water and a polymerization solution to reduce the content of chloride ions in the polymerization solution in the washing settling tank, but in production, the SV type static mixer is often blocked, so that the whole pressure of a washing unit is increased, and the safety of the device is influenced.
Based on above circumstances, add through vertical mixer in this embodiment, make the polymerization liquid subside the back through one-level and second grade washing, mix in getting into vertical mixer through circulating pump 9 with hot water and alkali lye together, then flow back once more to the blender through circulating pipe 6 and circulating pump 9 when the mixed liquid reaches the circulating line entry height in vertical mixer and mix, through circulation mixing processing the homogeneity that has improved polymerization liquid and hot water, thereby the washing effect has been improved, be favorable to avoiding not thoroughly the pipeline corrosion problem that leads to the fact follow-up system because of the washing. When the mixed liquid in the mixer reaches a top discharge port (full tank operation), the mixed liquid enters a third-stage washing settling tank through a discharge pipe.
Because the mixer in the embodiment adopts a vertical mixer, the volume of the mixer is larger than that of the previous SV type static mixer, and the volume of the mixer is 2-4m3The pall ring filler can increase the contact area of the polymerization liquid and hot water, further ensure that the polymerization liquid and the hot water are fully mixed, and effectively improve the washing effect.
In this embodiment, the first-stage washing settling tank 3 and the second-stage washing settling tank 10 are all provided with a boundary level meter 11 (the boundary level meter on the second-stage washing settling tank 10 is omitted in the figure), the upper and lower ends of the boundary level meter 11 are respectively connected with the top and the bottom of the first-stage washing settling tank and the second-stage washing settling tank, and the bottoms of the first-stage washing settling tank and the second-stage washing settling tank are all provided with a waste water discharge pipe 12. When the polymerized liquid is subjected to primary and secondary sedimentation water washing, the boundary level condition of the liquid in the tank can be monitored in real time through the boundary level meter 11, so that the valve on the waste water discharge pipe 12 is opened in time to discharge the acidic waste water at the bottom layer of the tank to a waste water station for further treatment, and the water washing effect of the polymerized liquid is favorably ensured.
Specifically, the blender that adopts in this embodiment is including parallelly connected first blender 8 and the second blender 7 that sets up, the structure and the mounting means homogeneous phase of two blenders, just carry out ejection of compact operation when full jar in two blenders to can carry out the multiple cycle to hot water and polymerization liquid before entering tertiary washing settling cask 5 and mix, be favorable to improving the washing effect of polymerization liquid, effectively solved the corruption problem of chloride ion to pipeline and system, and then can produce and obtain the better product of quality.
Example 2
As shown in fig. 1, the catalyst removal system for C5 petroleum resin production of this embodiment has a structure substantially the same as that of embodiment 1, and is mainly different from that of embodiment 1 in that: all be equipped with the valve on the inlet pipe of circulating pump 9 and the inlet pipe of blender, discharging pipe and the circulating line 6, realize the business turn over material and the circulation mixing operation of polymerization liquid through the switching of control valve. The vertical mixer that adopts in this embodiment is including parallelly connected first blender 8 and the second blender 7 that sets up, two blenders set up to one and open one and reserve, during actual production, valve on the accessible control blender inlet pipe puts into use one of them blender, another is as reserve, when the blender that puts into production needs the clearance or breaks down and need overhaul, still can carry out the production of changing the line fast through the reserve blender of valve control, and is easy and simple to handle, can effectively improve production efficiency, is favorable to guaranteeing the continuity of production.
Example 3
As shown in fig. 1, the structure of the catalyst removal system for C5 petroleum resin production in this embodiment is basically the same as that in embodiment 2, and the main differences are as follows: the lower end of the boundary level meter 11 is also connected with the liquid outlet of the hot water pipe 1 through a hot water flushing pipe 13, and the upper and lower end pipelines of the boundary level meter 11 and the hot water flushing pipe 13 are provided with valves. Specifically, in this embodiment, because the polymer liquid has viscosity, when the boundary level meter 11 is used to detect the water washing operation, the viscous polymer liquid is easy to adhere to the boundary level meter 11, so as to cause a false liquid level, thereby affecting the normal operation of the boundary level meter 11, and therefore the liquid level condition in the primary water washing settling tank 3 cannot be accurately judged. Aiming at the above problems, in this embodiment, a flushing pipeline (i.e. a hot water flushing pipe 13) is led out from the liquid outlet of the hot water pipe 1 and connected with the level gauge 11 for flushing the level gauge 11, so as to avoid the situation that the resin adheres to the level gauge 11 and generates a false liquid level, and effectively ensure the washing effect of the polymerization solution.
Example 4
As shown in fig. 1, the structure of the catalyst removal system for C5 petroleum resin production in this embodiment is basically the same as that in embodiment 3, and the main differences are as follows: the discharge hole of the second-stage washing settling tank 10 is also connected with the feed inlet of the third-stage washing settling tank 5 through a static mixer 4. Throw during normal production and carry out intensive mixing with vertical mixer to polymerization liquid and hot water, only when vertical mixer need overhaul, just can throw static mixer 4 and mix, be favorable to guaranteeing the continuity of production, simultaneously, static mixer 4 advance, all be equipped with the valve on the discharging pipe, select the pipeline to mix polymerization liquid and hot water through control flap, can realize artifical or automated control, convenient operation.
The polymer liquid is subjected to tertiary washing and sedimentation and then enters a primary sedimentation tank 14, a secondary sedimentation tank 15 and a tertiary sedimentation tank 16 for standing and sedimentation, wastewater and waste residues generated in the washing process of the polymer liquid are fully removed, the tertiary sedimentation tank is provided with a boundary level meter 11, inlet and outlet pipes and bottom wastewater pipes of the three sedimentation tanks are provided with regulating valves, and all the regulating valves are configured in a DCS and are connected with the boundary level meter.
Specifically, all the feeding regulating valves, the discharging regulating valve and the drainage regulating valve of the three settling tanks are configured in the DCS, the three settling tanks are controlled by the interlocking/reset switch in the DCS system to alternately feed, discharge and standing settling operations respectively, i.e., it is ensured that one settling tank in the three settling tanks is fed (the feeding regulating valve is opened and the discharging regulating valve is closed) at the same moment, one settling tank is kept standing (the feeding regulating valve and the discharging regulating valve are both closed), and one settling tank is discharged (the feeding regulating valve 501 and the discharging regulating valve 601 are both closed). When feeding inWhen the liquid level in the settling tank reaches the set high level, the settling tank switches to a standing mode, i.e. its feed regulating valve changes from open to closed. When the liquid level in the discharge settling tank reaches a set low liquid level, the settling tank is switched to a feeding mode, namely a feeding adjusting valve of the settling tank is switched from a closed state to an open state, and a discharge adjusting valve of the settling tank is switched from an open state to a closed state. And the standing settling tank is changed into a discharge settling tank, namely a discharge regulating valve is changed from closed to open, so that a full-automatic mode of feeding and discharging is realized, the settling residence time of the resin liquid is greatly prolonged, and Al (OH) generated in the washing process is ensured3The effective removal of the residue and the residual water improves the quality of the C5 petroleum resin finished product.
The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a C5 catalyst desorption system for petroleum resin production, includes one-level washing settling cask (3), second grade washing settling cask (10) and tertiary washing settling cask (5), its characterized in that: still include vertical mixer and circulating pump (9), all be equipped with boundary position meter (11) on one-level washing settling cask (3) and second grade washing settling cask (10), and the discharge gate of one-level washing settling cask (3) passes through the pipeline and links to each other with the feed inlet of second grade washing settling cask (10), the discharge gate of second grade washing settling cask (10) passes through circulating pump (9) and links to each other with vertical mixer's feed inlet, vertical mixer's discharge gate links to each other through the feed inlet of pipeline with tertiary washing settling cask (5) on the one hand, on the other hand passes through circulating pipe (6) and links to each other with the feed inlet of circulating pump (9).
2. The catalyst removal system for C5 petroleum resin production according to claim 1, wherein: the vertical mixer comprises a first mixer (8) and a second mixer (7) which are arranged in parallel, and pall ring packing is arranged in each mixer.
3. The catalyst removal system for C5 petroleum resin production according to claim 2, wherein: and the feeding and discharging pipelines of the mixer, the feeding pipe of the circulating pump (9) and the circulating pipeline (6) are respectively provided with a valve.
4. The catalyst removal system for C5 petroleum resin production according to any one of claims 1-3, wherein: and a feed inlet of the primary washing settling tank (3) is respectively connected with a discharge outlet of the washing stirring kettle (2) and the hot water pipe (1) through pipelines.
5. The catalyst removal system for C5 petroleum resin production according to claim 4, wherein: the upper end and the lower end of the boundary level meter (11) are respectively connected with the top and the bottom of the first-stage washing settling tank and the second-stage washing settling tank, and wastewater discharge pipes (12) are arranged at the bottoms of the first-stage washing settling tank and the second-stage washing settling tank.
6. The catalyst removal system for C5 petroleum resin production according to claim 5, wherein: the lower end of the boundary level meter (11) is also connected with a liquid outlet of the hot water pipe (1) through a hot water flushing pipe (13), and the pipelines at the upper end and the lower end of the boundary level meter (11) and the hot water flushing pipe (13) are respectively provided with a valve.
7. The catalyst removal system for C5 petroleum resin production according to claim 4, wherein: and the discharge hole of the secondary washing settling tank (10) is connected with the feed inlet of the tertiary washing settling tank (5) through a static mixer (4).
8. The catalyst removal system for C5 petroleum resin production according to claim 7, wherein: and valves are arranged on the feeding pipe and the discharging pipe of the static mixer (4).
9. The catalyst removal system for C5 petroleum resin production according to claim 7, wherein: the discharge gate of tertiary washing settling cask (5) passes through the pipeline and links to each other with one-level settling cask (14), second grade settling cask (15) and tertiary settling cask (16) respectively, and all is equipped with the boundary position meter on one-level, second grade and the tertiary settling cask.
10. The catalyst removal system for C5 petroleum resin production according to claim 9, wherein: and the inlet pipe, the outlet pipe and the bottom wastewater pipe of the primary settling tank (14), the secondary settling tank (15) and the tertiary settling tank (16) are respectively provided with a regulating valve, and all the regulating valves are configured in the DCS.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114195913A (en) * | 2021-12-23 | 2022-03-18 | 茂名鲁华新材料有限公司 | Method for improving flash evaporation effect of carbon five petroleum resin |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114195913A (en) * | 2021-12-23 | 2022-03-18 | 茂名鲁华新材料有限公司 | Method for improving flash evaporation effect of carbon five petroleum resin |
| CN114195913B (en) * | 2021-12-23 | 2023-08-18 | 广东鲁众华新材料有限公司 | Method for improving flash evaporation effect of carbon five petroleum resin |
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