Heterogeneous catalytic reaction rectification device for producing anisole by taking dimethyl carbonate and phenol as raw materials
The heterogeneous catalytic reaction distillation unit using dimethyl carbonate and phenol as raw materials has solved the environmental pollution problem in the existing anisole production, achieving green synthesis and efficient separation, and reducing waste emissions.
Patent Information
- Application Number
- CN202421745983.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2034-07-23
AI Technical Summary
Existing anisole production processes use highly toxic dimethyl sulfate, generating large amounts of wastewater, which is environmentally unfriendly, and the byproducts are difficult to treat.
Using dimethyl carbonate and phenol as raw materials, the synthesis is carried out through a heterogeneous catalytic reaction distillation unit with a solid catalyst, separating CO2 and methanol azeotrope and reducing waste emissions.
This has enabled the green production of anisole, reduced emissions of waste, improved conversion rate and selectivity, and lowered safety and environmental risks.
Smart Images
Figure CN223887974U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the production technology field of anisole, and particularly relates to a heterogeneous catalytic reaction rectification device for producing anisole by using dimethyl carbonate and phenol as raw materials. BACKGROUND
[0002] Anisole is also known as anisole, which has a pleasant aniseed aroma and is used for organic synthesis, as a solvent, a flavoring agent and an insect repellent. The existing industrial production process is to react dimethyl sulfate with phenol in lye to obtain anisole. The raw material dimethyl sulfate used is highly toxic, and a large amount of sodium sulfate is produced as a byproduct. The production of one ton of anisole produces 3 tons of wastewater, and the process route is not environmentally friendly.
[0003] Dimethyl carbonate is an environmentally friendly organic chemical raw material and can replace dimethyl sulfate as a methylating agent. In the reaction of synthesizing anisole from dimethyl carbonate and phenol, no alkali is needed, and the products include anisole, methanol and carbon dioxide. The raw material is green, and the process does not produce three wastes. SUMMARY
[0004] The utility model provides a heterogeneous catalytic reaction rectification device for producing anisole by using dimethyl carbonate and phenol as raw materials, which comprises a phenol storage tank and a dimethyl carbonate storage tank. The phenol storage tank and the dimethyl carbonate storage tank are respectively connected to T1 and T2, which are the feed inlets of the catalytic rectification section of the reaction rectification tower. CO2 and methanol-dimethyl carbonate azeotrope enter the gas-liquid separator through the water-cooled heat exchanger at the top of the reaction rectification tower, and the CO2 and methanol-dimethyl carbonate azeotrope are separated. The tower kettle is connected to a tower kettle reboiler and a tower kettle pump. The utility model is provided with a catalytic rectification section with a solid catalyst and a gas-liquid separator.
[0005] Compared with the prior art, the utility model has the advantages as follows:
[0006] The utility model is based on the full research on the process route, reaction mechanism and catalyst. In the reaction of synthesizing anisole from dimethyl carbonate and phenol, no alkali is needed, and the products include anisole, methanol and carbon dioxide. The raw material is green, and the process does not produce three wastes.
[0007] The utility model is provided with a catalytic rectification section with a solid catalyst. On the one hand, the reaction can be fully carried out to improve the conversion rate and selectivity. On the other hand, the product is easy to separate and can be recycled, which reduces the generation of solid waste and the safety and environmental protection problems caused by emission and the occupational health problems of the operating personnel. BRIEF DESCRIPTION OF DRAWINGS
[0008] Figure 1 The utility model is a structural schematic view.
[0009] The reference signs and names in the drawing are as follows:
[0010] 1, phenol storage tank; 2, dimethyl carbonate storage tank; 3, metering pump one; 4, metering pump two; 5, reaction rectification tower; 6, water-cooled heat exchanger; 7, gas-liquid separator; 8, tower kettle reboiler; 9, tower kettle pump. DETAILED DESCRIPTION
[0011] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0012] As shown in the accompanying drawings, Figure 1 The utility model provides a kind of heterogeneous catalysis reaction rectification device for producing anisole with dimethyl carbonate and phenol as raw material. It includes: phenol storage tank 1, dimethyl carbonate storage tank 2, phenol storage tank 1 and dimethyl carbonate storage tank 2 are connected with T1 feed inlet and T2 feed inlet of catalytic rectification section of reaction rectification tower 5 respectively, CO2 and methanol-dimethyl carbonate azeotrope enter gas-liquid separator 7 from the top of reaction rectification tower 5 through water-cooled heat exchanger 6, and CO2 and methanol-dimethyl carbonate azeotrope are separated, tower kettle reboiler 8 and tower kettle pump 9 are connected to tower kettle.
[0013] Specifically, metering pump one 3 is connected between phenol storage tank 1 and reaction rectification tower 5, and metering pump two 4 is connected between dimethyl carbonate storage tank 2 and reaction rectification tower 5. In this way, the input amount and input ratio of raw materials can be accurately controlled, which is conducive to the reaction and product formation.
[0014] Specifically, reaction rectification tower 5 includes tower top, rectification section, catalytic rectification section with solid catalyst, stripping section and tower kettle from top to bottom.
[0015] Specifically, reaction rectification tower 5 is a normal pressure or pressurized rectification tower, the reaction conditions are mild, and it does not require high energy consumption. The catalyst used in the catalytic rectification section with solid catalyst can effectively make phenol and dimethyl carbonate completely react, thereby improving conversion rate and selectivity.
[0016] Working principle: the utility model discloses a catalytic rectification section with solid catalyst is provided, and gas-liquid separator is equipped with. Including: phenol storage tank 1 is connected with the T1 feeding port of the catalytic rectification section of reaction rectifying tower 5 through metering pump one 3, and dimethyl carbonate 2 is connected with the T2 feeding port of the catalytic rectification section of reaction rectifying tower 5 through metering pump two 4, and under the action of catalyst, reaction. CO2 and methanol-dimethyl carbonate azeotrope flow to the top of column through rectification section, after cooling through water-cooled heat exchanger 6, enter gas-liquid separator 7 and are separated and extracted. Anisole flows to the column through rectification section, part returns to the column through column reboiler 8 to provide heat, and part is extracted through column pump 9. In the reaction of dimethyl carbonate and phenol synthesis anisole, no alkali is used, the product is anisole, methanol and carbon dioxide are produced, and the raw materials are green, and the process has the advantages of no three wastes emission.
[0017] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should understand the specification as a whole to form other embodiments that those skilled in the art can understand.
[0018] In the description of the utility model, it should be explained that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0019] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
Claims
1. A heterogeneous catalytic reactive distillation apparatus for producing anisole from dimethyl carbonate and phenol, comprising: Phenol storage tank (1) and dimethyl carbonate storage tank (2) are connected to the T1 feed port and T2 feed port of the catalytic distillation section of the reactive distillation column (5), respectively. CO2 and methanol-dimethyl carbonate azeotrope enter the gas-liquid separator (7) from the top of the reactive distillation column (5) through the water-cooled heat exchanger (6) and separate CO2 and methanol-dimethyl carbonate azeotrope. The bottom of the column is connected to the bottom reboiler (8) and the bottom pump (9).
2. The heterogeneous catalytic distillation apparatus for producing anisole using dimethyl carbonate and phenol as raw materials according to claim 1, characterized in that: A metering pump (3) is connected between the phenol storage tank (1) and the reactive distillation column (5).
3. The heterogeneous catalytic distillation apparatus for producing anisole using dimethyl carbonate and phenol as raw materials according to claim 1, characterized in that: A metering pump 2 (4) is connected between the dimethyl carbonate storage tank (2) and the reactive distillation column (5).
4. The heterogeneous catalytic distillation apparatus for producing anisole using dimethyl carbonate and phenol as raw materials according to claim 1, characterized in that: The reactive distillation column (5) includes, from top to bottom, a column top, a rectification section, a catalytic rectification section with a solid catalyst, a stripping section, and a column bottom.