Continuous production device for preparing methanol alkoxide by alkaline method
By combining a vertical reactor with multi-stage stainless steel filter plates, thin-film evaporators, and pervaporation membrane processes, the problems of low reaction efficiency and high cost in the alkaline process for preparing methanol alkoxides have been solved, achieving efficient, low-energy continuous production with superior product quality.
Patent Information
- Application Number
- CN202520456491.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-14
AI Technical Summary
Existing alkaline methods for preparing methanol alkoxides have low reaction efficiency, high cost, and difficulty in achieving continuous production. Traditional distillation methods have low dehydration efficiency, high energy consumption, cumbersome processes, and poor product quality.
The process employs a vertical reactor with multi-stage stainless steel filter plates, a thin-film evaporator, and a pervaporation membrane. Alkali is automatically added via a tubular chain machine to achieve multi-stage contact reaction between methanol and alkali. Combined with a thin-film evaporator and a membrane dehydrator, continuous production is achieved, simplifying the process flow, reducing equipment footprint, and lowering energy consumption.
It improves reaction efficiency, reduces energy consumption, simplifies the process, improves product quality, and achieves efficient and low-cost continuous production with a methanol alkoxide content of over 99.90%.
Smart Images
Figure CN223875003U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of metal alkoxide technology, and relates to methanol alkoxides, specifically to a continuous production apparatus for preparing methanol alkoxides by alkaline method. Background Technology
[0002] Methanol alkoxides, including potassium methoxide and sodium methoxide, are widely used as catalysts in organic chemical reactions, such as condensation reactions and transesterification. They are also a major raw material for pharmaceutical synthesis and an intermediate in pharmaceutical production, such as in the synthesis of vitamin A and vitamin B1. They are also commonly used in the pesticide, chemical, pharmaceutical, and leather industries. Potassium methoxide and sodium methoxide have similar uses in many areas, but potassium methoxide is relatively more expensive.
[0003] Common methods for preparing methanol alkoxides include the metal method and the alkaline method. The metal method involves the intermittent reaction of sodium metal with methanol, including feeding, nitrogen purging, reaction, and blending steps, which is very costly. The traditional alkaline method involves reacting methanol with sodium hydroxide, followed by preparing an alkaline solution, heating the reaction, distilling to dehydrate, and purifying the product. This process is cumbersome, inefficient, and produces poor product quality. Besides the cumbersome preparation of the alkaline solution, the commonly used distillation method has low dehydration efficiency, high energy consumption, large footprint, and is difficult to scale up for continuous production.
[0004] Therefore, finding a continuous production process for methanol alkoxides that is efficient, low-cost, and of superior quality has become a major challenge in this field. Summary of the Invention
[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a continuous production device for preparing methanol alkoxides by alkaline method, so as to solve the technical problem that the reaction efficiency of the existing production device needs to be further improved.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0007] A continuous production apparatus for preparing methanol alkali salts by alkaline method includes an alkaline feeder, the bottom outlet of which is connected to the first, second, third, fourth, and fifth inlets of a vertical reactor via a tubular chain conveyor.
[0008] The methanol storage tank is connected to the sixth inlet of the vertical reactor via the first transfer pump.
[0009] The bottom discharge port of the vertical reactor is connected with the feed inlet of the membrane evaporator through a second material transfer pump, the top discharge port of the membrane evaporator is connected with the bottom feed inlet of the membrane water remover through a third material transfer pump, the top discharge port of the membrane water remover is connected with the bottom feed inlet of the shell of the condenser through a fourth material transfer pump, and the bottom discharge port of the shell of the condenser is connected with the sixth feed inlet of the vertical reactor through a first material transfer pump.
[0010] The utility model also has the following technical features:
[0011] The oil outlet of the membrane evaporator is connected with the oil inlet of the high-temperature circulator, and the oil outlet of the high-temperature circulator is connected with the oil inlet of the membrane evaporator.
[0012] The bottom discharge port of the membrane evaporator is directly connected with a packaging machine.
[0013] The top gas outlet of the shell of the condenser is connected with a tail gas absorption tower.
[0014] The vertical reactor is made of 316L stainless steel, and the vertical reactor is internally provided with multiple stainless steel filter plates.
[0015] Compared with the prior art, the utility model has the following beneficial technical effects:
[0016] (I) The device adopts a vertical reactor, is provided with multiple 80-mesh stainless steel filter screens, automatically adds alkali to the filter screens through a pipe chain machine, and can add alkali at any time according to the reaction condition, and is in contact with methanol circulating from top to bottom. The excessive methanol is contacted with alkali multiple times and multiple stages, the reaction effect is good, and no other heat source needs to be provided. The methanol obtained through multiple-stage contact reaction each time has low water content, and is suitable for a pervaporation membrane process.
[0017] (II) The device adopts a membrane evaporator for drying, and has simple process operation, small occupied space, and high efficiency, and can achieve continuous production while reacting and drying.
[0018] (III) The device adopts a pervaporation membrane process for water removal, has low energy consumption, less pollution, simple process, simple operation, small occupied space, and the separated methanol content reaches more than 99.90%, and is recycled to the system. The recycling operation not only saves energy, simplifies the process, reduces the equipment occupied area, but also greatly improves the reaction rate and the quality of the product. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a whole structure schematic view of the continuous production device for preparing methanol alcoholate by an alkali method.
[0020] The meanings of the various reference numerals in the figures are as follows: 1 - base feeder, 2 - pipe chain machine, 3 - vertical reactor, 4 - methanol storage tank, 5 - thin film evaporator, 6 - high-temperature circulator, 7 - packaging machine, 8 - membrane water remover, 9 - condenser, 10 - tail gas absorption tower.
[0021] 11 - valve, 12 - first transfer pump, 13 - second transfer pump, 14 - third transfer pump, 15 - fourth transfer pump, 16 - pipeline.
[0022] 301 - first feed inlet, 302 - second feed inlet, 303 - third feed inlet, 304 - fourth feed inlet, 305 - fifth feed inlet, 306 - sixth feed inlet, 307 - bottom discharge outlet, 308 - stainless steel filter plate.
[0023] The specific content of the utility model is further explained and described in detail in combination with the embodiments below. DETAILED DESCRIPTION
[0024] It should be noted that all the components, devices and raw materials in the utility model, if not specifically stated, all use the components, devices and raw materials known in the prior art.
[0025] The various devices in the utility model are mainly connected through the pipelines 16, and the valves 11 are provided on each pipeline 16 as required, and are opened or closed according to process requirements. All the valves 11 in the utility model use the commonly used valves in the prior art.
[0026] According to the above technical solution, the specific embodiments of the utility model are given below, and it should be noted that the utility model is not limited to the following specific embodiments, and any equivalent transformation based on the technical solution of the present application falls within the protection scope of the utility model.
[0027] Embodiment:
[0028] This embodiment gives a continuous production device for preparing methanol alcohol salt by alkali method, as shown in FIG. Figure 1 The bottom discharge outlet of the base feeder 1 is connected to the first feed inlet 301, the second feed inlet 302, the third feed inlet 303, the fourth feed inlet 304 and the fifth feed inlet 305 of the vertical reactor 3 through the pipe chain machine 2.
[0029] As shown in FIG. Figure 1 The methanol storage tank 4 is connected to the sixth feed inlet 306 of the vertical reactor 3 through the first transfer pump 12.
[0030] As shown in FIG. Figure 1As shown in the figure, the bottom outlet 307 of the vertical reactor 3 is connected to the feed inlet of the thin film evaporator 5 through the second transfer pump 13, the top outlet of the thin film evaporator 5 is connected to the bottom feed inlet of the membrane water remover 8 through the third transfer pump 14, the top outlet of the membrane water remover 8 is connected to the bottom feed inlet of the shell side of the condenser 9 through the fourth transfer pump 15, and the bottom outlet of the shell side of the condenser 9 is connected to the sixth feed inlet 306 of the vertical reactor 3 through the first transfer pump 12.
[0031] As a preferred scheme of the embodiment, as shown in the figure, Figure 1 As shown in the figure, the oil outlet of the thin film evaporator 5 is connected to the oil inlet of the high-temperature circulator 6, and the oil outlet of the high-temperature circulator 6 is connected to the oil inlet of the thin film evaporator 5.
[0032] As a preferred scheme of the embodiment, as shown in the figure, Figure 1 As shown in the figure, the bottom outlet of the thin film evaporator 5 is directly connected to the packaging machine 7, and the process operation is simple, the occupied space is small, the efficiency is high, and the continuous production of reaction and drying can be achieved.
[0033] As a preferred scheme of the embodiment, as shown in the figure, Figure 1 As shown in the figure, the top gas outlet of the shell side of the condenser 9 is connected to the tail gas absorption tower 10.
[0034] As a preferred scheme of the embodiment, the vertical reactor 3 is made of known 316L stainless steel, as shown in the figure, Figure 1 As shown in the figure, the vertical reactor 3 is provided with a plurality of stainless steel filter plates 308. In the embodiment, the alkali is automatically added to the stainless steel filter plates 308 by the pipe chain machine 2, and the alkali can be added at any time according to the reaction condition and contacted with the methanol circulating from top to bottom. The excessive methanol is contacted with the alkali for multiple times and multiple stages, the reaction effect is good, and no other heat source needs to be provided. The methanol produced by each multiple-stage contact reaction has a low water content, and is suitable for the pervaporation membrane process.
[0035] In the embodiment, the membrane water remover 8 uses the pervaporation membrane process to remove water, has low energy consumption, less pollution, simple process, simple operation, small occupied space, and the separated methanol has a content of 99.90% or above, which is recycled to the system again.
[0036] The process of the continuous production process of the alkali method for preparing methanol alcohol salt by using the continuous production device for preparing methanol alcohol salt by the alkali method of the utility model is as follows:
[0037] The alkali is put into the alkali feeder 1, the pipe chain machine 2 and the corresponding valve 11 are opened, the alkali is transported to the stainless steel filter plate 308 of the vertical reactor 3, and the pipe chain machine 2 and the corresponding valve 11 are closed. At the same time, the high-temperature circulator 6 is opened to preheat the thin film evaporator 5. The first transfer pump 12 and the corresponding valve are opened, and the methanol in the methanol storage tank 4 is transferred to the vertical reactor 3, and the methanol and the alkali on the stainless steel filter plate 308 are sequentially contacted and reacted, the reaction time is 0.5 to 1 h, and the methanol solution with low water content and low methanol alkali content is obtained at the bottom of the vertical reactor 3.
[0038] The corresponding valves 11 of the thin film evaporator 5, the membrane water separator 8 and the condenser 9 are opened, and the second transfer pump 13, the third transfer pump 14, the fourth transfer pump 15 and the corresponding valves 11 are sequentially opened according to the situation. The solid product obtained by the methanol solution with low water content and low methanol alkali content after the thin film evaporator 5 is transferred into the packaging machine 7, the methanol with low water content enters the membrane water separator 8, the dehydrated methanol is in a gas-liquid mixed state, and then enters the condenser 9 through the fourth transfer pump 15, the non-condensable gas is discharged into the tail gas absorption tower 10, and the condensed methanol is again transferred into the vertical reactor 3 through the first transfer pump 12, the methanol storage tank 4 is supplemented with methanol according to the reaction condition, the alkali feeder 1 and the pipe chain machine 2 are supplemented with alkali according to the reaction condition, and a continuous circulation system is formed in this way.
Claims
1. A continuous production device for the production of methanolic alkali by the alkali method, comprising an alkali feeder (1), characterized in that, The bottom discharge port of the alkali feeder (1) is connected with the first feeding port (301), the second feeding port (302), the third feeding port (303), the fourth feeding port (304) and the fifth feeding port (305) of the vertical reactor (3) through the pipe chain machine (2); The methanol storage tank (4) is connected with the sixth feeding port (306) of the vertical reactor (3) through the first material transfer pump (12); The bottom discharge port (307) of the vertical reactor (3) is connected with the feeding port of the thin film evaporator (5) through the second material transfer pump (13), the top discharge port of the thin film evaporator (5) is connected with the bottom feeding port of the membrane water remover (8) through the third material transfer pump (14), the top discharge port of the membrane water remover (8) is connected with the bottom feeding port of the shell side of the condenser (9) through the fourth material transfer pump (15), and the bottom discharge port of the shell side of the condenser (9) is connected with the sixth feeding port (306) of the vertical reactor (3) through the first material transfer pump (12).
2. The continuous production apparatus for producing methanolic alkali by an alkali method according to claim 1, characterized by, The oil outlet of the thin film evaporator (5) is connected with the oil inlet of the high-temperature circulator (6), and the oil outlet of the high-temperature circulator (6) is connected with the oil inlet of the thin film evaporator (5).
3. The continuous production apparatus for producing methanolic alkali by an alkali method according to claim 1, characterized by, The bottom discharge port of the thin film evaporator (5) is directly connected with the packaging machine (7).
4. The continuous production apparatus for producing methanolic alkali by an alkali method according to claim 1, characterized by, The shell side top gas outlet of the condenser (9) is connected with the tail gas absorption tower (10).
5. The continuous production apparatus for producing methanolic alkali by an alkali method according to claim 1, wherein The vertical reactor (3) is made of 316L stainless steel, and the vertical reactor (3) is provided with multiple stainless steel filter plates (308).