A petroleum resin polymer separation and purification device

Abstract

The utility model relates to a kind of petroleum resin polymer separation purification device, belong to petrochemical technical field, including the thin film evaporator of three levels in series arrangement, retractable elastic structure is used in thin film evaporator to support wiper, can adapt to subtle installation error and wear error, effectively improve the wiper film effect, replaceable elastic structure can also adjust the pressure of wiper to evaporator jar inner wall, so that it is better adapted to different temperature and pressure conditions to different light phase component evaporation separation, the setting of three levels thin film evaporator, the purity and chroma of product can be well optimized, meet the demand of high-end adhesive, ink and other fields.

Description

Technical Field

[0001] This utility model belongs to the field of petrochemical technology, and in particular relates to the production of petroleum resin polymers, specifically a petroleum resin polymer separation and purification device. Background Technology

[0002] Petroleum resin is a thermoplastic resin produced from C5 to C9 fractions, byproducts of petroleum cracking, with the aid of a catalyst. It is named after its raw material, petroleum. Due to its advantages such as low price, good miscibility, low melting point, water resistance, and resistance to ethanol and chemicals, it is widely used in various industries and fields such as rubber, adhesives, coatings, papermaking, and inks.

[0003] The separation and purification of petroleum resins often require evaporators. Since different components have different boiling points, by applying specific temperatures and pressures, some of the lighter phases can be evaporated into a gaseous phase, achieving effective separation and purification. Among current evaporators, thin-film evaporators offer fast evaporation rates and can achieve rapid and precise separation of the lighter phase components within a precise temperature and pressure range.

[0004] Thin-film evaporators achieve rapid evaporation of light phase components by scraping material onto the inner wall of the evaporator tank using a scraper to form a thin film. In existing technologies, the scraper is often cylindrical, and the film is formed through tangential compression against the inner wall of the evaporator tank, as shown in CN103505894A. This scraper structure places extremely high demands on the specifications and installation precision of both the tank and the scraper. Even slight deviations can lead to uneven film thickness, severely impacting the evaporation effect. Furthermore, once installed, the pressure of the film-forming compression is fixed and cannot be adjusted, making it difficult to adapt to the evaporation and separation of different light phase components under varying temperature and pressure conditions. Additionally, with continued use, even slight wear between the scraper and the inner wall of the tank can significantly amplify the evaporation separation effect. These problems make it difficult for existing technologies to meet increasingly demanding separation requirements. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention proposes a petroleum resin polymer separation and purification device, which employs a redesigned thin-film evaporator structure to achieve precise separation of petroleum resin.

[0006] The technical problem to be solved by this utility model is achieved through the following technical solution: A petroleum resin polymer separation and purification device includes a thin-film evaporator and a condenser. The thin-film evaporator is externally wrapped with a heat jacket. In this invention, the thin-film evaporator includes a tank body with a feed inlet at the top and a light phase outlet on the top side of the tank body. A scraper motor is located directly above the tank body, with its motor shaft extending into the tank body, connected to a scraper assembly, and driving the scraper assembly to rotate. The scraper assembly includes scrapers that contact the inner wall of the tank body. The scrapers are supported by a retractable elastic support structure and press against the inner wall of the tank body.

[0007] In this utility model, the elastic support structure includes a telescopic sleeve and a scraper mounting structure. One end of the telescopic sleeve is connected to the side of the scraper facing the motor shaft, and the other end of the telescopic sleeve is connected to the scraper mounting structure. The scraper mounting structure rotates with the motor shaft of the scraping motor.

[0008] The scraper mounting structure includes a circular upper mounting plate, a circular lower mounting plate, and a scraper mounting frame disposed between the upper and lower mounting plates. The scraper mounting frame is a rotating structure with the center of the upper and lower mounting plates as its axis. V-shaped scraper mounting grooves are evenly provided on the side of the scraper mounting frame. The scraper is an arc-shaped sheet parallel to the motor shaft. One edge of the scraper is elastically connected to the V-shaped edge of the scraper mounting groove. At least two telescopic sleeves are connected to the middle of the side of each scraper facing the motor shaft. The telescopic sleeves are arranged longitudinally. With the support of the telescopic sleeves, the other side of the scraper is pressed against the inner wall of the tank. The scraper and the scraper mounting groove are on the upstream side when the scraper mounting structure rotates.

[0009] The outer diameter of the upper mounting plate is not less than the minimum outer diameter of the scraper mounting frame and not greater than its maximum outer diameter, so that the evaporated gaseous light phase can smoothly pass through the space between the upper mounting plate and the inner wall of the tank to reach the light phase outlet.

[0010] The telescopic sleeve is a sealing sleeve, including a tube, a push rod and an elastic medium. The tail end of the tube is hinged to the bottom of the scraper mounting groove. The end of the push rod is set as a ball head. The inner side of the scraper is provided with a push rod mounting seat that is universally matched with the ball head.

[0011] The elastic medium is an air column or spring enclosed between the tube and the push rod.

[0012] The end of the tube facing the push rod has a stepped seal that seals with the push rod.

[0013] In this invention, the separation and purification device includes three identical thin-film evaporators connected in series. The feed inlet of the first-stage thin-film evaporator receives the raw material, and its light phase outlet is connected to the first-stage condenser for condensation and recovery. Its heavy phase outlet is connected to the second-stage thin-film evaporator, the light phase outlet of the second-stage thin-film evaporator is connected to the second-stage condenser for condensation and recovery, and its heavy phase outlet is connected to the third-stage thin-film evaporator. The light phase outlet of the third-stage thin-film evaporator is connected to the third-stage condenser for condensation and recovery, and its heavy phase outlet enters a storage tank for later use.

[0014] The first-stage thin-film evaporator is designed with a temperature of 180±5 ℃ and an operating pressure of 500-1000 Pa; the second-stage thin-film evaporator is designed with a temperature of 250±5 ℃ and an operating pressure of 100-500 Pa; and the third-stage thin-film evaporator is designed with a temperature of 320±5 ℃ and an operating pressure of 10-100 Pa.

[0015] Compared with the prior art, the present invention has the following advantages: (1) The thin film evaporator of this application adopts a stretchable elastic structure to support the scraper. Under the support of the elastic structure, the scraper can adapt to minor installation errors and wear errors, effectively improving the scraping effect of the scraper. (2) The thin film evaporator of this application adopts an elastic structure for supporting the scraper. By replacing the telescopic sleeve of the elastic structure, the pressure of the scraper on the inner wall of the evaporator tank can be adjusted, so that it can better adapt to the evaporation and separation of different light phase components under different temperature and pressure conditions. (3) The thin film evaporator of this application constrains the installation position of the scraper mounting frame by the upper mounting plate and the lower mounting plate, and can also effectively balance its rotation center of gravity. The outer diameter range of the upper mounting plate provides sufficient flow channel for the gaseous light phase after evaporation to escape from the gas phase outlet. (4) The three-stage series thin film evaporator used in this application can separate and collect various light phases, effectively improving the purity and separation effect of various products from the separation and purification of petroleum resin polymers. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the process of this application; Figure 2 This is a schematic diagram of the thin-film evaporator structure of this application; Figure 3 for Figure 2 AA section diagram; Figure 4 for Figure 2 A schematic diagram of the telescopic sleeve structure in the middle; Figure 5 This is a cross-sectional view of the internal structure of another thin-film evaporator according to this application.

[0017] In the diagram: 1. First-stage thin-film evaporator; 2. Second-stage thin-film evaporator; 3. Third-stage thin-film evaporator; 4. First-stage condenser; 5. Second-stage condenser; 6. Third-stage condenser; 7. Raw material storage tank; 8. Tank body; 9. Feed inlet; 10. Light phase outlet; 11. Heavy phase outlet; 12. Scraper motor; 13. Motor shaft; 14. Heat jacket; 15. Scraper blade; 16. Scraper blade mounting frame; 17. Upper mounting plate; 18. Lower mounting plate; 19. Telescopic sleeve; 20. Scraper blade mounting groove; 21. Scraper blade connecting shaft; 22. Push rod mounting seat; 23. Ball head; 24. Push rod; 25. Tube; 26. Spring. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. Example

[0019] A petroleum resin polymer separation and purification device, such as Figure 1 As shown, the system includes a thin-film evaporator and a condenser. The thin-film evaporator has three stages connected in series. The inlet of the first-stage thin-film evaporator is connected to the raw material storage tank. Its light phase outlet is connected to the first-stage condenser for condensation and recovery. Its heavy phase outlet is connected to the second-stage thin-film evaporator. The light phase outlet of the second-stage thin-film evaporator is connected to the second-stage condenser for condensation and recovery. Its heavy phase outlet is connected to the third-stage thin-film evaporator. The light phase outlet of the third-stage thin-film evaporator is connected to the third-stage condenser for condensation and recovery. Its heavy phase outlet enters the storage tank for later use.

[0020] According to the process, the design temperature of the first-stage thin-film evaporator is 180±5 ℃ and the operating pressure is 500-1000 Pa; the design temperature of the second-stage thin-film evaporator is 250±5 ℃ and the operating pressure is 100-500 Pa; and the design temperature of the third-stage thin-film evaporator is 320±5 ℃ and the operating pressure is 10-100 Pa.

[0021] The first-stage thin-film evaporator is mainly used to remove light components and protect heat-sensitive resins. Unreacted monomers, residual solvents, and oligomers are separated. Petroleum resins do not undergo thermal decomposition for short periods below 180°C, avoiding discoloration or cross-linking caused by high temperatures. The second-stage thin-film evaporator is used to refine the resin and control its molecular weight distribution. Oligomers with moderate polymerization degree, cyclic dimers, and some antioxidant decomposition products are removed and separated. Through selective vaporization, oligomers that affect resin viscosity and compatibility are removed, reducing the Mw / Mn ratio from 3-5 in the raw material to 2.0-2.5. The third-stage thin-film evaporator is used for deep refining and improving product stability. High molecular weight impurities, metal catalyst residues, and heat-sensitive degradation products are removed and separated. Through high-temperature vaporization, easily oxidized unsaturated double bond structures are removed, improving the resin's aging resistance. The three-stage gradient setting reduces energy consumption by using the low temperature and low pressure in the front stage and the high temperature and high pressure in the rear stage to utilize the waste heat of the secondary steam in the front stage, effectively reducing the energy consumption of single-unit evaporation; the step-by-step heating avoids damage to the film-coating assembly from a single high temperature; through three-stage separation, the purity and color of the product are greatly optimized, meeting the needs of high-end adhesives, inks and other fields. Example

[0022] A petroleum resin polymer separation and purification apparatus includes a thin-film evaporator as shown in Example 1. Figure 2 As shown, the thin-film evaporator includes a tank and a heat jacket disposed outside the tank. The upper part of the tank is provided with a feed inlet, the top side of the tank is provided with a light phase outlet, and the lower end of the tank is provided with a heavy phase outlet. A scraping film assembly is disposed inside the tank, and the scraping film assembly rotates under the drive of a scraping film motor through a motor shaft.

[0023] like Figure 2 and Figure 3 As shown, the scraping assembly includes a scraper blade in contact with the inner wall of the tank and an elastic support structure. The scraper blade presses against the inner wall of the tank under the support of the retractable elastic support structure. The elastic support structure includes a telescopic sleeve and a scraper blade mounting structure. The scraper blade mounting structure includes a circular upper mounting plate, a circular lower mounting plate, and a scraper blade mounting frame disposed between the upper and lower mounting plates. The scraper blade mounting frame is a rotating structure centered on the motor shaft of the scraping motor. V-shaped scraper blade mounting grooves are evenly arranged on the side of the scraper blade mounting frame. The scraper blade is an arc-shaped sheet parallel to the motor shaft. One edge of the scraper blade is elastically connected to the V-shaped edge of the scraper blade mounting groove. At least two telescopic sleeves are connected to the middle of the scraper blade facing the motor shaft. The telescopic sleeves are arranged longitudinally. Under the support of the telescopic sleeves, the other side of the scraper blade is in close contact with the inner wall of the tank. The scraper blade and the scraper blade mounting groove are on the upstream side when the scraper blade mounting structure rotates.

[0024] exist Figure 4In the process, the telescopic sleeve is a sealing sleeve, including a tube, a push rod and an elastic medium. The tail end of the tube is hinged to the bottom of the scraper mounting groove. The end of the push rod is set as a ball head. The inner side of the scraper is provided with a push rod mounting seat that is universally matched with the ball head. The elastic medium is a spring that connects the push rod located from the inner end of the tube to the depth of the tube. Example

[0025] A petroleum resin polymer separation and purification device includes a thin-film evaporator as shown in Example 1. The thin-film evaporator includes a tank and a heat jacket disposed outside the tank. A feed inlet is provided at the upper part of the tank, a light phase outlet is provided on the top side of the tank, and a heavy phase outlet is provided at the lower end of the tank. A scraping film assembly is disposed inside the tank, and the scraping film assembly rotates under the drive of a scraping film motor via a motor shaft. The scraping film assembly includes a scraper blade in contact with the inner wall of the tank and an elastic support structure. The elastic support structure includes a telescopic sleeve and a scraper blade mounting structure.

[0026] The scraper mounting structure includes a circular upper mounting plate, a circular lower mounting plate, and a scraper mounting frame disposed between the upper and lower mounting plates. The scraper mounting frame is located at the center of the upper and lower mounting plates. Unlike embodiment 2, as shown in example... Figure 5 As shown, scraper connecting shafts are evenly arranged circumferentially between the upper and lower mounting plates. One edge of the scraper is fixedly connected to the scraper connecting shaft, and the scraper rotatably engages with the upper and lower mounting plates through the scraper connecting shaft. Each scraper corresponds to a scraper connecting shaft. At least two telescopic sleeves are connected to the middle of the side of each scraper facing the motor shaft. The telescopic sleeves are arranged longitudinally. With the support of the telescopic sleeves, the other side of the scraper is pressed against the inner wall of the tank. One side of the scraper and the scraper mounting groove is the upstream side when the scraper mounting structure rotates.

Claims

1. A petroleum resin polymer separation and purification apparatus comprising a thin film evaporator and a condenser, the thin film evaporator being externally wrapped with a heat jacket, characterized in that: The thin-film evaporator includes a tank body with a feed inlet at the top and a light phase outlet on the top side of the tank body. A scraper motor is located directly above the tank body, with its motor shaft extending into the tank body, connected to the scraper assembly, and driving the scraper assembly to rotate. The scraper assembly includes scrapers that contact the inner wall of the tank body, and the scrapers are pressed against the inner wall of the tank body under the support of a retractable elastic support structure.

2. The separation and purification device according to claim 1, characterized in that: The elastic support structure includes a telescopic sleeve and a scraper mounting structure. One end of the telescopic sleeve is connected to the side of the scraper facing the motor shaft, and the other end of the telescopic sleeve is connected to the scraper mounting structure. The scraper mounting structure rotates with the motor shaft of the scraping motor.

3. The separation and purification device according to claim 2, characterized in that: The scraper mounting structure includes a circular upper mounting plate, a circular lower mounting plate, and a scraper mounting frame disposed between the upper and lower mounting plates. The scraper mounting frame is a rotating structure with the center of the upper and lower mounting plates as its axis. V-shaped scraper mounting grooves are evenly provided on the side of the scraper mounting frame. The scraper is an arc-shaped sheet parallel to the motor shaft. One edge of the scraper is elastically connected to the V-shaped edge of the scraper mounting groove. At least two telescopic sleeves are connected to the middle of the side of each scraper facing the motor shaft. The telescopic sleeves are arranged longitudinally. With the support of the telescopic sleeves, the other side of the scraper is in close contact with the inner wall of the tank. The side of the scraper and the scraper mounting groove is the upstream side when the scraper mounting structure rotates.

4. The separation and purification device according to claim 3, characterized in that: The outer diameter of the upper mounting plate is not less than the minimum outer diameter of the scraper mounting frame and not greater than its maximum outer diameter.

5. The separation and purification device of claim 2, wherein: The telescopic sleeve is a sealing sleeve, including a tube, a push rod and an elastic medium. The tail end of the tube is hinged to the bottom of the scraper mounting groove. The end of the push rod is set as a ball head. The inner side of the scraper is provided with a push rod mounting seat that is universally matched with the ball head.

6. The separation and purification apparatus of claim 5, wherein: The elastic medium is an air column or spring enclosed between the tube and the push rod.

7. The separation and purification apparatus of claim 5, wherein: The end of the tube facing the push rod has a stepped seal that seals with the push rod.

8. The separation and purification apparatus of claim 1, wherein: The separation and purification device includes three identical thin-film evaporators connected in series. The feed inlet of the first-stage thin-film evaporator receives the raw material, and its light phase discharge is connected to the first-stage condenser for condensation and recovery. Its heavy phase discharge is connected to the second-stage thin-film evaporator, the light phase discharge of the second-stage thin-film evaporator is connected to the second-stage condenser for condensation and recovery, and its heavy phase discharge is connected to the third-stage thin-film evaporator. The light phase discharge of the third-stage thin-film evaporator is connected to the third-stage condenser for condensation and recovery, and its heavy phase discharge enters a storage tank for later use.

9. The separation and purification apparatus of claim 8, wherein: The first-stage thin-film evaporator is designed with a temperature of 180±5℃ and an operating pressure of 500-1000Pa; the second-stage thin-film evaporator is designed with a temperature of 250±5℃ and an operating pressure of 100-500Pa; and the third-stage thin-film evaporator is designed with a temperature of 320±5℃ and an operating pressure of 10-100Pa.

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