Cyclohexyl hydroperoxide homogeneous decomposition system
By setting up a pre-decomposition reactor and decomposition reactor in the cyclohexyl hydrogen peroxide decomposition process and mixing with inert gas when the catalyst and scale inhibitor are added, the problems of insufficient conversion rate and high catalyst consumption in the existing process are solved, and higher yields and lower production costs are achieved.
Patent Information
- Application Number
- CN202421378828.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-17
AI Technical Summary
In the existing cyclohexyl hydrogen peroxide decomposition process, the conversion rate is insufficient, the catalyst and auxiliary agent consumption is high, and the waste alkali liquid is treated with high cost, making it difficult to achieve efficient homogeneous decomposition.
A homogeneous decomposition system of cyclohexyl hydrogen peroxide was designed. By setting up a pre-decomposition reactor and decomposition reactor in the process flow, mixing with inert gas when the catalyst and scale inhibitor are added, and then mixing with cyclohexyl hydrogen peroxide solution, more full mixing and dispersion is achieved.
The homogeneous decomposition yield of cyclohexyl hydrogen peroxide is improved, raw material consumption and production costs are reduced, and side reactions of the post-treatment process are reduced.
Smart Images
Figure CN222694700U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of cyclohexanone production, and specifically provides a cyclohexyl hydroperoxide homogeneous decomposition system. Background Art
[0002] The decomposition of cyclohexyl hydroperoxide is an important process in the production of cyclohexanone by the cyclohexane oxidation method. The industry generally adopts a heterogeneous catalytic decomposition route under an alkaline environment, which has the characteristics of high conversion rate and low yield. However, a large amount of waste alkali liquid will be produced in this route, which increases the cost of environmental protection treatment; on the other hand, this route also has the problem of difficulty in subsequent separation of organic and inorganic phases. The homogeneous decomposition technology of cyclohexyl hydroperoxide has the advantage of high yield, but due to its insufficient conversion rate, the technical route of combining homogeneous decomposition + heterogeneous decomposition is often adopted in industrial practice to improve the decomposition yield of cyclohexyl hydroperoxide and reduce the alkali consumption of heterogeneous decomposition and the generation of waste alkali liquid. In the process of applying the homogeneous decomposition technology, due to the dispersed addition of the catalyst and the short residence time, the homogeneous decomposition yield of cyclohexyl hydroperoxide is low, and the consumption of catalysts and auxiliary agents is high. Summary of the invention
[0003] The utility model provides a cyclohexyl hydroperoxide homogeneous decomposition system, which can better realize the mixed homogeneous decomposition reaction of the catalyst and the oxidizing liquid, improve the yield, and reduce the raw material consumption and cost in the cyclohexanone production process.
[0004] The technical scheme of the utility model is a cyclohexyl hydrogen peroxide homogeneous decomposition system, comprising a pre-decomposition reactor and a decomposition reactor, wherein the pre-decomposition reactor is provided with a feed inlet, a feed distributor is provided inside, a liquid phase outlet is provided at the bottom and connected to the decomposition reactor, and gas phase outlets are provided at the tops of the pre-decomposition reactor and the decomposition reactor, and the two are connected to a cyclohexane distillation device after being merged through a pipeline; the system also comprises a cyclohexyl hydrogen peroxide oxidized liquid pipeline, an inert gas pipeline, a catalyst pipeline and a scale inhibitor pipeline connected to the feed inlet of the pre-decomposition reactor.
[0005] Furthermore, the system also includes a first mixer, a catalyst pipeline and a scale inhibitor pipeline are connected to a feed port of the first mixer after merging, an inert gas pipeline is connected to another feed port of the first mixer, and an outlet pipeline of the first mixer is merged with a cyclohexyl hydrogen peroxide oxidized liquid pipeline and connected to a feed port of a predecomposition reactor.
[0006] Furthermore, the system is also provided with a second mixer, the discharge port pipeline and the cyclohexyl hydrogen peroxide oxidized liquid pipeline of the first mixer are respectively connected to the feed port of the second mixer, and the discharge port pipeline of the second mixer is connected to the feed port of the pre-decomposition reactor.
[0007] Furthermore, the second mixer is a mixer with feeding from both sides.
[0008] Furthermore, flow meters are provided on the inert gas pipeline, the catalyst pipeline and the antiscalant pipeline.
[0009] Furthermore, both the pre-decomposition reactor and the decomposition reactor are provided with liquid level gauges.
[0010] Furthermore, the discharge pipe of the decomposition reactor is connected to a post-processing process via a discharge pump.
[0011] The utility model has the following beneficial effects:
[0012] 1. By setting up a pre-decomposition reactor, on the one hand, the mixing effect can be enhanced, and the residence time can be extended, so that a part of cyclohexane can be flashed out in advance, and the later homogeneous reaction can be more sufficient.
[0013] 2. When the catalyst is added, the utility model mixes it with the scale inhibitor and then promotes it through an inert gas, and then mixes it fully and then mixes it with the cyclohexyl hydrogen peroxide oxidation liquid, which greatly improves the dispersion effect of the catalyst and the scale inhibitor, and reduces the amount of organic catalyst and organic scale inhibitor by 30-50%; under the condition of the same amount of catalyst added, the yield of cyclohexyl hydrogen peroxide homogeneous decomposition can be increased by 5-20%, and the side reaction of the post-treatment process is reduced, so as to reduce the consumption of raw materials and costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION
[0015] The implementation scheme of the utility model will be described in detail below in conjunction with examples and drawings, but those skilled in the art will understand that the following examples are only used to illustrate the utility model and should not be regarded as limiting the scope of the utility model.
[0016] like Figure 1 As shown, the utility model discloses a cyclohexyl hydrogen peroxide homogeneous decomposition system, comprising a pre-decomposition reactor 7 and a decomposition reactor 8, wherein the pre-decomposition reactor 7 is provided with a feed inlet, a feed distributor is provided inside, a liquid phase outlet is provided at the bottom and connected to the decomposition reactor 8, and gas phase outlets are provided at the tops of the pre-decomposition reactor 7 and the decomposition reactor 8, and the two are connected to a cyclohexane distillation device 6 after being merged through a pipeline; the system also comprises a cyclohexyl hydrogen peroxide oxidized liquid pipeline 1, an inert gas pipeline 2, a catalyst pipeline 3 and a scale inhibitor pipeline 4 connected to the feed inlet of the pre-decomposition reactor 7.
[0017] By arranging the pre-decomposition reactor 7 at the front end of the decomposition reactor 8, the catalyst and the material can be mixed more fully, and the residence time can be prolonged, so that the reaction can be more complete.
[0018] In some embodiments, the system further comprises a first mixer 10, the catalyst pipeline 3 and the antiscalant pipeline 4 are connected to a feed port of the first mixer 10 after merging, the inert gas pipeline 2 is connected to another feed port of the first mixer 10, and the outlet pipeline of the first mixer 10 is merged with the cyclohexyl hydrogen peroxide oxidizing liquid pipeline 1 and connected to the feed port of the pre-decomposition reactor 7. The catalyst and the antiscalant are first mixed and then mixed with the compressed inert gas, and further mixed with the oxidizing liquid under the impetus of the inert gas, so that the catalyst can be mixed with the oxidizing liquid containing cyclohexyl hydrogen peroxide in smaller droplets, so that the catalyst is dispersed more evenly, the yield is improved, and the raw material consumption and cost in the cyclohexanone production process are reduced.
[0019] In some embodiments, the system is further provided with a second mixer 11, the outlet pipe of the first mixer 10 and the cyclohexyl hydrogen peroxide oxidized liquid pipe 1 are respectively connected to the feed port of the second mixer 11, and the outlet pipe of the second mixer 11 is connected to the feed port of the pre-decomposition reactor 7. In a more preferred embodiment, the second mixer 11 is a mixer for feeding from both sides.
[0020] In some of the embodiments, flow meters are provided on the inert gas pipeline 2 , the catalyst pipeline 3 and the antiscalant pipeline 4 .
[0021] In some of the embodiments, both the pre-decomposition reactor 7 and the decomposition reactor 8 are provided with liquid level gauges.
[0022] In some embodiments, the outlet pipe of the decomposition reactor 8 is connected to the post-processing step 5 via a discharge pump 9 .
[0023] In a more preferred embodiment, multiple conditional valves can also be set, such as a regulating valve on the inert gas pipeline 2, a regulating valve on the pipeline of the pre-decomposition reactor 7 to the cyclohexane distillation device 6, and a regulating valve on the pipelines between the pre-decomposition reactor 7 and the decomposition reactor 8 and between the decomposition reactor 8 and the post-processing process 5, and the regulating valves are designed in association with the pressure, flow rate, etc. to realize automatic control of the operation and reduce the safety risks caused during the operation of the system.
[0024] In the specific embodiment, the flow rates of the catalyst and the scale inhibitor are 90-150 L / h and 100-130 L / h respectively, and the feed is mixed under the action of compressed inert gas, and the flow rate is 520-550 m 3 / h, the cyclohexyl hydrogen peroxide oxidized liquid pipeline with a temperature of 120-140℃ merges and enters the pre-decomposition reactor, mixes and flashes out part of the cyclohexane, and then enters the decomposition reactor for homogeneous decomposition reaction. After the reaction, the material containing cyclohexyl hydrogen peroxide that meets the conditions is sent to the post-processing process through the discharge pump and the control regulating valve; the homogeneous decomposition yield can be increased by 5-20%, the side reactions of the post-processing process are reduced, and the consumption of raw materials and costs are reduced. The flash gas phase in the homogeneous decomposition reactor and the flash gas phase of the homogeneous pre-decomposition reactor merge to go to the cyclohexane distillation device.
[0025] The above embodiments are only for illustrating the technical ideas and features of the utility model, and the contents are only preferred embodiments of the utility model, but the protection scope of the utility model is not limited thereto. Within the technical scope disclosed by the utility model, equivalent changes or improvements based on the technical solution and utility model concept of the utility model should be included in the protection scope of the utility model.
Claims
1. A cyclohexyl hydroperoxide homogeneous decomposition system, characterized in that: The system comprises a pre-decomposition reactor (7) and a decomposition reactor (8); the pre-decomposition reactor (7) is provided with a feed inlet, a feed distributor is provided inside, a liquid phase outlet is provided at the bottom and is connected to the decomposition reactor (8); the tops of the pre-decomposition reactor (7) and the decomposition reactor (8) are both provided with gas phase outlets, which are connected to a cyclohexane distillation device (6) after being joined via a pipeline; the system also comprises a cyclohexyl hydrogen peroxide oxidizing liquid pipeline (1) connected to the feed inlet of the pre-decomposition reactor (7), an inert gas pipeline (2), a catalyst pipeline (3) and a scale inhibitor pipeline (4).
2. The system according to claim 1, characterized in that: The system further comprises a first mixer (10), a catalyst pipeline (3) and a scale inhibitor pipeline (4) are connected to a feed port of the first mixer (10) after merging, an inert gas pipeline (2) is connected to another feed port of the first mixer (10), and an outlet pipeline of the first mixer (10) is merged with a cyclohexyl hydrogen peroxide oxidation liquid pipeline (1) and connected to a feed port of a pre-decomposition reactor (7).
3. The system according to claim 2, characterized in that: The system is further provided with a second mixer (11), the outlet pipe of the first mixer (10) and the cyclohexyl hydrogen peroxide oxidized liquid pipe (1) are respectively connected to the feed port of the second mixer (11), and the outlet pipe of the second mixer (11) is connected to the feed port of the pre-decomposition reactor (7).
4. The system according to claim 3, characterized in that: The second mixer (11) is a mixer for feeding from both sides.
5. The system according to any one of claims 1 to 4, characterized in that: The inert gas pipeline (2), the catalyst pipeline (3) and the antiscalant pipeline (4) are all provided with flow meters.
6. The system according to any one of claims 1 to 4, characterized in that: Liquid level gauges are provided on both the pre-decomposition reactor (7) and the decomposition reactor (8).
7. The system according to any one of claims 1 to 4, characterized in that: The discharge pipe of the decomposition reactor (8) is connected to the post-processing step (5) via a discharge pump.