Circulating pipe type rapid reaction device for tert-butyl carbonate monoalkali metal salt

Abstract

The utility model discloses a circulating pipe type rapid reaction device for tert-butyl carbonate monoalkali metal salt. The circulating pipe type rapid reaction device comprises a gas compressor and a raw material liquid storage tank, the gas compressor is connected with the large end of the reducing pipe, the small end of the reducing pipe is connected with one end of the throat pipe, the other end of the throat pipe is connected with the small end of the diverging pipe, and the reducing pipe, the throat pipe and the diverging pipe form a venturi mixer; the large end of the diverging pipe is connected with a feed port of the reactor, a bottom discharge port of the reactor is connected with a recovery liquid storage tank, and the recovery liquid storage tank is connected with a liquid feed port of the throat pipe through a first transfer pump to recover liquid; and the raw material liquid storage tank is used for feeding through a second material transfer pump and a liquid feeding hole of the throat pipe. According to the device disclosed by the utility model, the carbon dioxide gas and the tert-butyl alkali metal salt solution can be sufficiently and quickly mixed, the gas-liquid contact surface is enlarged, the distribution is more uniform, the reaction is complete, few byproducts are generated, and the overall performance of the reaction device of the tert-butyl carbonate monoalkali metal salt is improved.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, and relates to tert-butyl carbonate monoalkali metal salt, specifically to a circulating tubular rapid reaction device for tert-butyl carbonate monoalkali metal salt. Background Technology

[0002] tert-butyl carbonate monoalkali metal salts, generally referring to sodium or potassium tert-butyl carbonate, are important precursors for the synthesis of BOC anhydrides (i.e., di-tert-butyl dicarbonate). The traditional reaction method for tert-butyl carbonate monoalkali metal salts is a batch reactor, where carbon dioxide is introduced into the bottom of the reactor through a vent pipe to react with the reaction liquid. This method suffers from problems such as poor uniformity of gas-liquid distribution, slow reaction rate, numerous side reactions, and uneven reaction temperature. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a circulating tubular rapid reaction device for tert-butyl carbonate monoalkali metal salts, thereby solving the technical problem that the overall performance of existing reaction devices for tert-butyl carbonate monoalkali metal salts needs further improvement.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A circulating tubular rapid reaction device for tert-butyl carbonate monoalkali metal salts includes a gas compressor and a feed liquid storage tank.

[0006] The gas compressor is connected to the large end of the converging tube, the small end of the converging tube is connected to one end of the throat tube, and the other end of the throat tube is connected to the small end of the diverging tube. The converging tube, the throat tube, and the diverging tube constitute a Venturi mixer.

[0007] The large end of the diffuser is connected to the feed inlet of the reactor, and the bottom outlet of the reactor is connected to the recovery liquid storage tank. The recovery liquid storage tank is connected to the liquid inlet of the throat pipe through the first transfer pump to recover the liquid.

[0008] The raw material liquid storage tank is supplied with material through a second transfer pump and the liquid inlet of the throat pipe.

[0009] This utility model also has the following technical features:

[0010] The liquid inlet of the throat tube is provided with an atomizing curved shell, and multiple atomizing mesh holes are evenly opened on the atomizing curved shell.

[0011] The reactor is equipped with a gas outlet.

[0012] A sampler is installed at the bottom of the recovered liquid storage tank.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] (I) The device of this invention can fully and rapidly mix carbon dioxide gas and tert-butyl alkali metal salt solution, expand the gas-liquid contact surface, distribute more evenly, complete the reaction and produce fewer by-products, thereby improving the overall performance of the reaction device for tert-butyl carbonate monoalkali metal salt.

[0015] (II) The device of this invention utilizes a gas compressor to compress carbon dioxide and a Venturi mixer to atomize the low-temperature tert-butyl alkali metal salt organic solution, thereby greatly increasing the gas-liquid contact area between carbon dioxide and the organic solution, and rapidly completing the reaction in the reactor. The unreacted reaction liquid separated from the reactor can be recycled and participate in the reaction again, thus achieving the goal of rapidly completing the reaction, with fewer reaction byproducts and a more thorough reaction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a circulating tubular rapid reaction device for tert-butyl carbonate monoalkali metal salts.

[0017] Figure 2 This is a schematic diagram of the internal structure of the larynx.

[0018] The meanings of the labels in the diagram are as follows: 1-Gas compressor, 2-Converging tube, 3-Throat tube, 4-Diverging tube, 5-Reactor, 6-Recovery liquid storage tank, 7-First transfer pump, 8-Raw material liquid storage tank, 9-Second transfer pump, 10-Atomizing curved shell, 11-Atomizing mesh, 12-Gas outlet, 13-Sampler, 14-Pipeline, 15-Valve.

[0019] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, all components, equipment and raw materials in this utility model are based on components, equipment and raw materials known in the prior art.

[0021] In this invention, the various devices are mainly connected by pipes 14. Each pipe 14 is equipped with a valve 15 as needed, which is opened or closed according to process requirements. All valves 15 in this invention are commonly used valves in the prior art.

[0022] Following the above technical solution, the following are specific embodiments of this utility model. It should be noted that this utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0023] Example:

[0024] This embodiment provides a circulating tubular rapid reaction apparatus for tert-butyl carbonate monoalkali metal salts, such as... Figure 1 As shown, it includes a gas compressor 1 and a raw material liquid storage tank 8.

[0025] like Figure 1 As shown, the gas compressor 1 is connected to the large end of the converging tube 2, the small end of the converging tube 2 is connected to one end of the throat tube 3, and the other end of the throat tube 3 is connected to the small end of the diverging tube 4. The converging tube 2, the throat tube 3, and the diverging tube 4 constitute a Venturi mixer.

[0026] like Figure 1 As shown, the large end of the diffuser 4 is connected to the feed inlet of the reactor 5, and the bottom outlet of the reactor 5 is connected to the recovery liquid storage tank 6. The recovery liquid storage tank 6 is connected to the liquid inlet of the throat pipe 3 through the first transfer pump 7 to recover the liquid.

[0027] like Figure 1 As shown, the raw material storage tank 8 is supplied with material through the second transfer pump 9 and the liquid inlet of the throat pipe 3.

[0028] As a preferred embodiment of this invention, such as Figure 2 As shown, an atomizing curved shell 10 is provided on the liquid inlet of the throat 3, and multiple atomizing mesh holes 11 are uniformly opened on the atomizing curved shell 10. The atomizing mesh holes 11 adopt an atomizing mesh hole size of φ=100μm. Under the action of the slight negative pressure suction of the carbon dioxide gas flow, the liquid is dispersed and atomized into droplets when passing through the atomizing mesh holes 11. The droplets enter the reactor 5 through the diffuser 4 under the action of the carbon dioxide gas flow to complete the reaction.

[0029] As a preferred embodiment of this invention, such as Figure 1 As shown, reactor 5 is equipped with a gas outlet 12.

[0030] As a preferred embodiment of this invention, such as Figure 1 As shown, a sampler 13 is installed at the bottom of the recovery liquid storage tank 6. The sampler 13 is a sampler commonly known in the art. The sampler 13 performs real-time sampling. When the reaction is not complete, the recovery liquid is pumped back into the system through the first transfer pump 7 to mix with the raw material liquid. The mixed solution continues to enter the system for reaction until the sampler 13 shows that the reaction is basically complete, at which point the reaction stops.

[0031] In this embodiment, the reaction raw material used is a sodium tert-butoxide solution in dichloroethane with a concentration of 5 wt.%. The reaction raw material is stored in the raw material storage tank 8 and is transported to the throat pipe 3 by the second transfer pump 9.

[0032] In this embodiment, to achieve the optimal reaction temperature, the raw material storage tank 8, the recovery liquid storage tank 6, and the reactor 5 are all equipped with low-temperature insulation devices, which contain a low-temperature circulating coolant. The coolant is a mixture of 40wt% ethylene glycol and 60wt% water, providing low-temperature conditions for the raw material storage tank 8, the recovery liquid storage tank 6, and the reactor 5, respectively. The low-temperature condition is maintained at approximately -10°C.

[0033] The specific process of the reaction using the circulating tubular rapid reaction device for tert-butyl carbonate monoalkali metal salt of this invention is as follows: Carbon dioxide is compressed by gas compressor 1 and enters the converging tube 2 of the Venturi mixer, and then reaches the diverging tube 4 through the throat 3. At the throat 3, the carbon dioxide mixes with the liquid (including raw material liquid and recovered liquid) delivered by the liquid inlet, and after being atomized by the atomizing mesh 11 on the atomizing curved shell 10, they enter the reactor 5 through the diverging tube 4. After the reaction is completed in the reactor 5, the mixture is discharged from the bottom outlet. The unreacted carbon dioxide gas is discharged from the system through the gas outlet 12.

Claims

1. A circulating tubular rapid reaction apparatus for a tert-butyl carbonate monoalkali metal salt, comprising a gas compressor (1) and a feed liquid storage tank (8); characterized in that: The gas compressor (1) is connected to the large end of the converging tube (2), the small end of the converging tube (2) is connected to one end of the throat tube (3), and the other end of the throat tube (3) is connected to the small end of the expanding tube (4). The converging tube (2), the throat tube (3) and the expanding tube (4) constitute a Venturi mixer. The large end of the diffuser (4) is connected to the feed inlet of the reactor (5), the bottom outlet of the reactor (5) is connected to the recovery liquid storage tank (6), and the recovery liquid storage tank (6) is connected to the liquid inlet of the throat (3) through the first transfer pump (7) to recover liquid. The raw material liquid storage tank (8) is supplied with material through the liquid inlet of the throat pipe (3) via the second transfer pump (9).

2. The circulating tubular rapid reaction apparatus for tert-butyl carbonate monoalkali metal salts as described in claim 1, characterized in that, The throat (3) is provided with an atomizing curved shell (10) on the liquid inlet, and a plurality of atomizing mesh holes (11) are evenly opened on the atomizing curved shell (10).

3. The circulating tubular rapid reaction apparatus for tert-butyl carbonate monoalkali metal salt as described in claim 1, characterized in that, The reactor (5) is provided with a gas outlet (12).

4. The circulating tubular rapid reaction apparatus for tert-butyl carbonate monoalkali metal salt as described in claim 1, characterized in that, A sampler (13) is installed at the bottom of the recovery liquid storage tank (6).

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