A system for concentrating and decoloring cumene hydroperoxide
The hydrogen peroxide cumene concentration and decolorization system, which utilizes multi-stage flash evaporation and vacuum low-temperature operation, has solved the problem of excessive color in hydrogen peroxide cumene, achieving both color reduction and concentration increase, thus ensuring the product quality and safety of ABS resin production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIHUAYI WEIYUAN CHEM CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-06-09
AI Technical Summary
In the existing technology, cumene hydroperoxide has a high color intensity, which cannot meet the requirements of downstream ABS resin production, resulting in yellowing of the product.
The hydrogen peroxide cumene concentration and decolorization system employs multi-stage flash evaporation and vacuum low-temperature operation, including a primary flash tank, a secondary flash tank, and a tertiary flash tank. By separating heavy components and removing light components in stages, the system reduces color and increases concentration.
It effectively reduces the color of cumene hydroperoxide and increases its concentration to 85 wt%, meeting the requirements of downstream ABS resin production, preventing product yellowing, and reducing the risk of process runaway.
Smart Images
Figure CN224331518U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical production technology, specifically to a hydrogen peroxide cumene concentration and decolorization system. Background Technology
[0002] Cumene hydroperoxide (CHP) is an organic peroxide with high chemical reactivity. At appropriate temperatures, it can rapidly decompose to generate free radicals, thereby initiating polymerization reactions. This property makes CHP an indispensable initiator in many chemical reactions, playing a vital role in the chemical industry. Especially in the production of materials such as rubber, plastics, and ABS resin, CHP can effectively improve reaction rates and efficiency.
[0003] In polymerization reactions, cumene hydroperoxide (CHP) plays two main roles: first, it increases the reaction rate, enabling rapid growth of polymer molecular chains; second, it influences the structure and properties of the polymer. By controlling the amount of initiator and reaction conditions, polymers with specific properties can be synthesized. In the petrochemical industry, CHP, as an important free radical initiator, is widely used in the production processes of polymers such as ABS resin and polystyrene. Especially in the ABS resin production process, CHP generates free radicals through thermal decomposition, effectively initiating the graft copolymerization reaction of styrene, acrylonitrile, and butadiene. This triggers the crosslinking reaction of the butadiene-formed rubber phase (PB) segments, forming a three-dimensional network structure and significantly improving the impact strength and crack resistance of ABS.
[0004] Industrially, cumene hydroperoxide is generally an intermediate product in phenol-acetone plants. The main production process involves the air oxidation of cumene. Pretreated cumene is oxidized with air in a three-stage oxidation system to obtain approximately 24.2 wt% cumene hydroperoxide. This is then sent to a concentration unit to obtain a higher concentration of cumene hydroperoxide. This cumene hydroperoxide is then sent to an acid hydrolysis unit to produce phenol and acetone. If this high-concentration intermediate cumene hydroperoxide is directly fed into an ABS production plant, which lacks CHP color treatment facilities, and because cumene hydroperoxide undergoes side reactions during oxidation to produce trace amounts of heavy components, and the concentration stage lacks facilities to remove these high-color heavy components, the high-concentration cumene hydroperoxide has a high color (platinum-cobalt color of approximately 191–240), which does not meet the requirements for downstream ABS initiators (platinum-cobalt color ≤ 100). This leads to irreversible yellowing of the ABS product, affecting the final product quality and causing unsaleable goods. Utility Model Content
[0005] To address the technical issue of effectively reducing the color of cumene hydroperoxide (CHP) (from platinum-cobalt color to ≤100) to meet the color requirements of cumene hydroperoxide (CHP) in downstream ABS resin production and avoid yellowing of ABS products, this invention provides a cumene hydroperoxide concentration and decolorization system.
[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a hydrogen peroxide cumene concentration and decolorization system, comprising a primary flash tank, a secondary flash tank connected to the top of the primary flash tank via a pipe, a light and heavy component collection tank connected to the bottom of the primary flash tank via a pipe, the light and heavy component collection tank connected to the top of the secondary flash tank via a pipe, a tertiary flash tank connected to the bottom of the secondary flash tank via a pipe, the light and heavy component collection tank connected to the top of the tertiary flash tank via a pipe, and a vacuum unit connected to the top of the light and heavy component collection tank.
[0007] Furthermore, the bottom of the first-stage flash tank is provided with a first-stage flash heater for circulating and heating the material inside the first-stage flash tank; the bottom of the second-stage flash tank is provided with a second-stage flash heater for circulating and heating the material inside the second-stage flash tank; and the bottom of the third-stage flash tank is provided with a third-stage flash heater for circulating and heating the material inside the third-stage flash tank.
[0008] Furthermore, the primary flash heater, the secondary flash heater, and the tertiary flash heater are all one of the following: thermosiphon reboiler, falling film evaporator, and rising film evaporator.
[0009] Furthermore, sampling ports are provided on one side of each of the primary flash tank, secondary flash tank, and tertiary flash tank.
[0010] Furthermore, temperature measuring devices are installed on the primary flash tank, the secondary flash tank, and the tertiary flash tank.
[0011] Furthermore, a product pump for conveying CHP products is installed at the bottom of the three-stage flash tank.
[0012] Furthermore, a product cooler is provided between the three-stage flash tank and the product pump.
[0013] Furthermore, a light and heavy component pump for conveying light and heavy components is provided at the bottom of the light and heavy component collection tank.
[0014] Furthermore, a primary condenser is provided between the primary flash tank and the secondary flash tank; a secondary condenser is provided between the secondary flash tank and the light and heavy component collection tank; and a tertiary condenser is provided between the tertiary flash tank and the light and heavy component collection tank.
[0015] Furthermore, a heavy component cooler is provided between the primary flash tank and the light heavy component collection tank.
[0016] The beneficial effects achieved by this utility model are as follows:
[0017] 1. This utility model achieves efficient decolorization and concentration of CHP through multi-stage flash evaporation and vacuum low-temperature operation, taking into account safety, environmental protection and economy, significantly improving the product quality of downstream ABS resin, and solving the key problem of yellowing of products caused by excessive color in traditional processes.
[0018] 2. This utility model sequentially purifies the product through a primary flash tank, a secondary flash tank, and a tertiary flash tank (the primary stage separates heavy components, and the secondary and tertiary stages remove light components), effectively separating heavy components that cause increased color (such as dimethyl anisole). Finally, the platinum-cobalt color of the CHP product is reduced to 40, which is far below the downstream requirement of ≤100, and the concentration is gradually increased to 85wt%, meeting the needs of ABS production.
[0019] 3. This utility model uses 24.2 wt% intermediate product as raw material and gradually concentrates it to 85 wt% through multi-stage flash evaporation, avoiding direct processing of high-concentration reactor liquid and significantly reducing the risk of process runaway. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0021] Explanation of markings in the diagram: 1. First-stage flash tank; 2. First-stage flash heater; 3. First-stage condenser; 4. Second-stage flash tank; 5. Second-stage flash heater; 6. Second-stage condenser; 7. Third-stage flash tank; 8. Third-stage flash heater; 9. Third-stage condenser; 10. Product cooler; 11. Product pump; 12. Heavy component cooler; 13. Light and heavy component collection tank; 14. Vacuum unit; 15. Light and heavy component pump; 101. Raw material; 102. First-stage flash vapor; 103. Heavy components; 104. Second-stage flash vapor; 105. Second-stage flash liquid; 106. Third-stage flash vapor; 107. CHP product; 108. Light and heavy components. Detailed Implementation
[0022] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of the cumene hydrogen peroxide concentration and decolorization system of this utility model.
[0023] like Figure 1As shown, a cumene hydrogen peroxide concentration and decolorization system includes a primary flash tank 1, a primary flash heater 2 for circulating and heating the material inside the primary flash tank 1 at its bottom, a secondary flash tank 4 connected to the top of the primary flash tank 1 via a pipe, a primary condenser 3 for cooling the primary flash vapor 102 installed on the connecting pipe between the primary flash tank 1 and the secondary flash tank 4, a light and heavy component collection tank 13 connected to the bottom of the primary flash tank 1 via a pipe, and a heavy component cooler 12 for cooling the heavy component 103 installed on the connecting pipe between the primary flash tank 1 and the light and heavy component collection tank 13. A secondary flash heater 5 for circulating and heating the material inside the secondary flash tank 4 is installed at the bottom of the secondary flash tank 4, a light and heavy component collection tank 13 connected to the top of the secondary flash tank 4 via a pipe, a secondary condenser 6 for cooling the secondary flash vapor 104 installed on the connecting pipe between the secondary flash tank 4 and the light and heavy component collection tank 13, and a tertiary flash tank 7 connected to the bottom of the secondary flash tank 4 via a pipe. The bottom of the three-stage flash tank 7 is equipped with a three-stage flash heater 8 for circulating and heating the material inside the three-stage flash tank 7. The top of the three-stage flash tank 7 is connected to a light and heavy component collection tank 13 via a pipe. A three-stage condenser 9 for cooling the three-stage flash vapor 106 is installed on the connecting pipe between the three-stage flash tank 7 and the light and heavy component collection tank 13. The bottom of the three-stage flash tank 7 is connected to a product pump 11 for outputting CHP product 107 via a pipe. A product cooler 10 for cooling CHP product 107 is installed on the connecting pipe between the three-stage flash tank 7 and the product pump 11. The top of the light and heavy component collection tank 13 is equipped with a vacuum unit 14, which can uniformly control the pressure inside the light and heavy component collection tank 13, the first-stage flash tank 1, the second-stage flash tank 4, and the third-stage flash tank 7. The bottom of the light and heavy component collection tank 13 is equipped with a light and heavy component pump 15 for conveying light and heavy components 108.
[0024] The primary flash heater 2, the secondary flash heater 5, and the tertiary flash heater 8 are all one of the following: thermosiphon reboiler, falling film evaporator, and rising film evaporator. The novel design preferably uses a thermosiphon reboiler. The material at the bottom of the flash tank enters the flash heater, and after exchanging heat with the steam, the heated material re-enters the flash tank. The purpose of heating is to provide heat for the vaporization of the material, so that the material in the flash tank can reach the most suitable vaporization temperature.
[0025] Temperature measuring devices are installed on the primary flash tank 1, the secondary flash tank 4, and the tertiary flash tank 7. These devices can monitor the temperature of the materials inside the primary flash tank 1, the secondary flash tank 4, and the tertiary flash tank 7 in real time, facilitating the monitoring of the material temperature inside these three tanks.
[0026] Each of the primary flash tank 1, secondary flash tank 4, and tertiary flash tank 7 is equipped with a sampling port on one side. Workers can use the sampling port to take samples of the material in the corresponding flash tank to test the concentration of cumene hydroperoxide in the material, preventing excessive concentration of cumene hydroperoxide from causing a safety accident.
[0027] The process flow of this utility model is as follows:
[0028] Pretreated cumene and air were oxidized in a three-stage oxidation system to obtain approximately 24.2 wt% cumene hydroperoxide as raw material 101.
[0029] Raw material 101 first enters the primary flash tank 1. The bottom of the primary flash tank 1 is equipped with a primary flash heater 2 as a reboiler. Most of the cumene and cumene hydroperoxide are vaporized into primary flash vapor 102. The primary flash vapor 102 is condensed by the primary condenser 3 and sent to the secondary flash tank 4. The secondary flash tank 4 receives the low-concentration CHP intermediate product with high color and removes it. By controlling the heating temperature, the CHP concentration in the heavy component 103 at the bottom of the primary flash tank 1 is controlled to be ≤85wt%, which improves the safety level. The heavy component 103 is then cooled by the heavy component cooler 12 and sent to the light heavy component collection tank 13. High-concentration CHP (e.g., ≥90wt%) is heat-sensitive and easily decomposes upon heating to generate free radicals, which may trigger chain reactions or even explosion risks. Using 24.2wt% intermediate product as raw material 101, the concentration is gradually increased to 85wt% through multi-stage flash evaporation, avoiding direct processing of high-concentration reactor liquid and significantly reducing the risk of process runaway.
[0030] In the secondary flash tank 4, a secondary flash heater 5 is installed as a reboiler, where most of the cumene is vaporized and then condensed by the secondary condenser 6. The condensed cumene is sent to the light and heavy component collection tank 13. The concentration of CHP at the bottom of the secondary flash tank 4 is controlled by controlling the heating temperature, and the concentrated CHP intermediate product is sent to the tertiary flash tank 7.
[0031] In the three-stage flash tank 7, a three-stage flash heater 8 is installed as a reboiler to further vaporize cumene. After being condensed by a three-stage condenser 9, the condensed cumene is sent to the light and heavy component collection tank 13. The CHP concentration at the bottom of the three-stage flash tank 7 is controlled to be ≤85wt% by controlling the heating temperature. The concentrated CHP product 107 is sent to the product cooler 10 for cooling, and then sent to the product tank area by the product pump 11.
[0032] All collected light and heavy components 108 are transported to light and heavy component collection tank 13, and then sent to the outside for recycling via light and heavy component pump 15. The vacuum in each flash tank of this invention is achieved by vacuum unit 14.
[0033] Among them, flash tank 1 (primary stage), flash tank 4 (secondary stage), and flash tank 7 (tertiary stage) operate under vacuum negative pressure with an operating pressure ≤0.5 kPaA; flash tanks 1 (primary stage), flash tank 4 (secondary stage), and flash tank 7 (tertiary stage) operate at low temperatures with an operating temperature ≤50℃, specifically 48.13℃, 32.94℃, and 46.05℃ respectively. Operating the low-concentration raw material 101 at low temperatures (≤50℃) reduces side reactions caused by high temperatures (such as the decomposition of CHP to produce acetophenone, dimethyl anisole, and other colored substances), and avoids the formation of colored substances. The materials used are designed to ensure product stability and reduce the generation of heavy component 103. The cooling medium used in the primary condenser 3, secondary condenser 6, tertiary condenser 9, product cooler 10, and heavy component cooler 12 is 0℃ low-temperature water. The CHP concentration in the heavy component 103 at the bottom of the primary flash tank 1 is controlled at ≤85wt%. The CHP concentration in the heavy component 103 at the bottom of the tertiary flash tank 7 is controlled at ≤85wt%. The heat source used in the primary flash heater 2, secondary flash heater 5, and tertiary flash heater 8 is hot water at ≤85℃.
[0034] Table 1. Colorimetric properties of raw material 101, heavy component 103, and CHP product 107 of this utility model.
[0035] Serial Number name Platinum-cobalt color (Pt-Co) 1 Raw material 101 21 2 Recombination of 103 165 3 CHP Product 107 40
[0036] Table 2 Logistics Data Sheet of This Utility Model
[0037]
[0038]
[0039] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.
Claims
1. A cumene hydrogen peroxide concentration and decolorization system, characterized in that: It includes a primary flash tank (1), the top of which is connected to a secondary flash tank (4) via a pipe, the bottom of which is connected to a light and heavy component collection tank (13) via a pipe, the top of which is connected to the light and heavy component collection tank (13) via a pipe, the bottom of which is connected to a tertiary flash tank (7) via a pipe, the top of which is connected to the light and heavy component collection tank (13) via a pipe, and the top of which is connected to a vacuum unit (14).
2. The hydrogen peroxide cumene concentration and decolorization system according to claim 1, characterized in that: The bottom of the first-stage flash tank (1) is provided with a first-stage flash heater (2) for circulating heating of the material inside the first-stage flash tank (1); the bottom of the second-stage flash tank (4) is provided with a second-stage flash heater (5) for circulating heating of the material inside the second-stage flash tank (4); the bottom of the third-stage flash tank (7) is provided with a third-stage flash heater (8) for circulating heating of the material inside the third-stage flash tank (7).
3. The hydrogen peroxide cumene concentration and decolorization system according to claim 2, characterized in that: The primary flash heater (2), secondary flash heater (5) and tertiary flash heater (8) are all one of the following: thermosiphon reboiler, falling film evaporator and rising film evaporator.
4. The hydrogen peroxide isopropylbenzene concentration and decolorization system according to claim 1, characterized in that: Sampling ports are provided on one side of each of the primary flash tank (1), secondary flash tank (4), and tertiary flash tank (7).
5. The hydrogen peroxide cumene concentration and decolorization system according to claim 1, characterized in that: Temperature measuring devices are installed on the primary flash tank (1), the secondary flash tank (4), and the tertiary flash tank (7).
6. The hydrogen peroxide cumene concentration and decolorization system according to claim 1, characterized in that: The bottom of the three-stage flash tank (7) is equipped with a product pump (11) for conveying CHP product (107).
7. The hydrogen peroxide cumene concentration and decolorization system according to claim 6, characterized in that: A product cooler (10) is provided between the three-stage flash tank (7) and the product pump (11).
8. The hydrogen peroxide cumene concentration and decolorization system according to claim 1, characterized in that: The bottom of the light and heavy component collection tank (13) is equipped with a light and heavy component pump (15) for conveying light and heavy components (108).
9. The hydrogen peroxide cumene concentration and decolorization system according to claim 1, characterized in that: A primary condenser (3) is provided between the primary flash tank (1) and the secondary flash tank (4); a secondary condenser (6) is provided between the secondary flash tank (4) and the light and heavy component collection tank (13); and a tertiary condenser (9) is provided between the tertiary flash tank (7) and the light and heavy component collection tank (13).
10. The hydrogen peroxide cumene concentration and decolorization system according to claim 1, characterized in that: A heavy component cooler (12) is provided between the primary flash tank (1) and the light and heavy component collection tank (13).