Pre-reactor based on reaction of maleic anhydride and ethanol

Abstract

The pre-reactor comprises a reaction kettle, a stirring mechanism and a temperature adjusting mechanism, two material inlets are formed in the top of the reaction kettle, a discharging opening is formed in the bottom of the reaction kettle, and the temperature adjusting mechanism comprises a cooling inner coil pipe and a steam outer coil pipe. The cooling inner coil pipe is arranged in the reaction kettle, the steam outer coil pipe is arranged at the bottom of the reaction kettle, and the stirring mechanism is mounted at the top of the reaction kettle and used for stirring materials in the reaction kettle; maleic anhydride and ethanol enter from two material inlets in the upper part of the reaction kettle in two paths and flow out from a material outlet in the bottom of the reaction kettle after reaction is finished, so that the maleic anhydride and the ethanol have enough retention time in the reaction kettle, the reaction kettle is heated through the steam outer coil pipe, and the reaction rate of the maleic anhydride and the ethanol is increased; and cooling can be realized through the cooling inner coil pipe, so that the temperature in the reaction kettle is always in a stable state.

Description

TECHNICAL FIELD

[0001] The utility model relates to maleic anhydride and ethanol reaction equipment field especially based on maleic anhydride and ethanol reaction's pre -reactor. BACKGROUND

[0002] The reaction between maleic anhydride and ethanol belongs to esterification reaction. Esterification reaction usually refers to the reaction of alcohol with carboxylic acid or oxygen-containing anhydride to generate ester and water, the hydroxyl group in ethanol first undergoes nucleophilic addition reaction with the carbonyl group in maleic anhydride to generate an intermediate, in the reaction process of maleic anhydride and ethanol, generally speaking, in chemical reaction, increasing temperature can increase the movement speed and collision frequency of reactant molecules, thereby improving the reaction rate, therefore, in the reaction of maleic anhydride and ethanol, appropriately increasing temperature helps to speed up the reaction process, although temperature does not directly affect the equilibrium conversion rate, but too high temperature can lead to the occurrence of side reactions in the reaction of maleic anhydride and ethanol, thereby reducing the yield and purity of target product, therefore, providing a pre-reactor for the stable temperature of maleic anhydride and ethanol reaction has become an urgent problem to be solved. SUMMARY

[0003] (I) technical problem to be solved

[0004] In order to solve the above problems of the prior art, the utility model provides a pre -reactor based on maleic anhydride and ethanol reaction.

[0005] (II) technical scheme

[0006] In order to achieve the above purpose, the main technical scheme adopted by the utility model includes:

[0007] A pre-reactor based on maleic anhydride and ethanol reaction, including reaction kettle, stirring mechanism and temperature adjusting mechanism;

[0008] The top of the reaction kettle is provided with two material inlets, and the bottom of the reaction kettle is provided with a discharge port;

[0009] The temperature adjusting mechanism includes cooling inner coil pipe and steam outer coil pipe;

[0010] The cooling inner coil pipe is arranged in the reaction kettle;

[0011] The steam outer coil pipe is arranged at the bottom of the reaction kettle;

[0012] The stirring mechanism is installed at the top of the reaction kettle and is used for stirring the materials in the reaction kettle.

[0013] Preferably, the cooling inner coil pipe is spiral, cooling water circulates in the cooling inner coil pipe, and the water inlet and water outlet of the cooling inner coil pipe extend to the reaction kettle.

[0014] Preferably, the steam outer coil is spirally wound at the bottom of the outer wall of the reaction kettle, and hot steam flows in the steam outer coil.

[0015] Preferably, the stirring mechanism comprises a motor, a speed reducer, a stirring shaft and stirring blades, the motor is connected to the stirring shaft through the speed reducer, the stirring shaft extends into the reaction kettle, and a plurality of stirring blades are arranged on the stirring shaft.

[0016] Preferably, the automatic catalysis mechanism comprises a catalyst storage tank, a first conveying pipe, a first control valve and an infrared spectrum sensor, the infrared spectrum sensor is connected to the reaction kettle, the bottom of the catalyst storage tank is connected to the reaction kettle through the first conveying pipe, the first control valve is installed on the first conveying pipe, and the first control valve and the infrared spectrum sensor are both electrically connected to the single-chip microcomputer.

[0017] Preferably, the automatic catalysis mechanism comprises a catalyst storage tank, a first conveying pipe, a first control valve and an infrared spectrum sensor, the infrared spectrum sensor is connected to the reaction kettle, the bottom of the catalyst storage tank is connected to the reaction kettle through the first conveying pipe, the first control valve is installed on the first conveying pipe, and the first control valve and the infrared spectrum sensor are both electrically connected to the single-chip microcomputer.

[0018] (III) Beneficial effects

[0019] The beneficial effects of the utility model lie in that:

[0020] 1. Maleic anhydride and ethanol enter from two material inlets at the upper part of the reaction kettle in two ways, and flow out from the discharge port at the bottom of the reaction kettle after the reaction is completed, so that they have sufficient residence time in the reaction kettle, the reaction kettle is heated through the steam outer coil, the reaction rate of maleic anhydride and ethanol is improved, if the temperature in the reaction kettle is too high, cooling can be realized through the cooling inner coil, so that the temperature in the reaction kettle is always in a stable state;

[0021] 2. Automatic catalysis and polymerization inhibition are realized through the automatic catalysis mechanism and the automatic polymerization inhibition mechanism, and the product production efficiency is improved. DRAWINGS

[0022] Figure 1 It is a structure schematic view of the first embodiment of the utility model;

[0023] Figure 2 It is a structure schematic view of the second embodiment of the utility model.

[0024] Mark explanation:

[0025] 1. Reaction kettle;

[0026] 2、stirring mechanism;

[0027] 3、material inlet;

[0028] 4、temperature adjusting mechanism;

[0029] 41、cooling inner coil pipe; 42、steam outer coil pipe;

[0030] 5、discharge outlet;

[0031] 6、automatic catalyzing mechanism;

[0032] 61、catalyst storage tank; 62、first control valve; 63、infrared spectrum sensor;

[0033] 7、automatic polymerization inhibition mechanism;

[0034] 71、polymerization inhibitor storage tank; 72、second control valve; 73、dielectric constant sensor. DETAILED DESCRIPTION

[0035] In order to better explain the utility model, so as to facilitate understanding, below combining with the drawings, by specific embodiment, the utility model is described in detail.

[0036] Please refer to Figure 1 The first embodiment of the utility model:

[0037] A pre-reactor based on maleic anhydride and ethanol reaction, comprising a reaction kettle 1, a stirring mechanism 2 and a temperature adjusting mechanism 4;

[0038] Two material inlets 3 are arranged at the top of the reaction kettle 1, and a discharge outlet 5 is arranged at the bottom of the reaction kettle 1;

[0039] The temperature adjusting mechanism 4 comprises a cooling inner coil pipe 41 and a steam outer coil pipe 42;

[0040] The cooling inner coil pipe 41 is arranged in the reaction kettle 1;

[0041] The steam outer coil pipe 42 is arranged at the bottom of the reaction kettle 1;

[0042] The stirring mechanism 2 is installed at the top of the reaction kettle 1 and is used for stirring the material in the reaction kettle 1;

[0043] In use, maleic anhydride and ethanol enter the reaction kettle 1 from two material inlets 3 at the top of the reaction kettle 1 in two ways, and flow out from the discharge outlet 5 at the bottom of the reaction kettle 1 after the reaction is completed, so that they have sufficient residence time in the reaction kettle 1, the reaction kettle 1 is heated by the steam outer coil pipe 42, the reaction rate of maleic anhydride and ethanol is improved, and if the temperature in the reaction kettle 1 is too high, the cooling inner coil pipe 41 can be used for cooling, so that the temperature in the reaction kettle 1 is always in a stable state.

[0044] In the embodiment, the cooling inner coil 41 is in a spiral shape, cooling water flows in the cooling inner coil 41, and the water inlet and the water outlet of the cooling inner coil 41 extend to the reaction kettle 1.

[0045] In the embodiment, the steam outer coil 42 is in a spiral shape and is wound on the bottom of the outer wall of the reaction kettle 1, and hot steam flows in the steam outer coil 42.

[0046] In the embodiment, the stirring mechanism 2 comprises a motor, a speed reducer, a stirring shaft and stirring blades, the motor is connected to the stirring shaft through the speed reducer, the stirring shaft extends into the reaction kettle 1, and a plurality of stirring blades are arranged on the stirring shaft.

[0047] In use, the motor drives the stirring shaft to rotate, and the stirring blades on the stirring shaft are used for stirring.

[0048] Reference Figure 2 The second embodiment of the utility model:

[0049] On the basis of the above-mentioned embodiment one, the automatic catalysis mechanism 6 is further included, the automatic catalysis mechanism 6 includes catalyst storage tank 61, first conveying pipe, first control machine valve 62 and infrared spectrum sensor 63, infrared spectrum sensor 63 is connected reaction kettle 1, catalyst storage tank 61 bottom is connected reaction kettle 1 through first conveying pipe, first control machine valve 62 is installed on first conveying pipe, and first control machine valve 62 and infrared spectrum sensor 63 are electrically connected single-chip microcomputer;

[0050] In use, infrared spectrum sensor 63 monitors the infrared absorption peak change of reactants and products in the reaction process, assesses the reaction rate by calculating the change rate of peak area or peak height, if the reaction rate is lower than threshold value, single-chip microcomputer drives first control machine valve 62 to open, and catalyst in catalyst storage tank 61 is quantitatively introduced into reaction kettle 1, to realize automatic catalysis.

[0051] In the embodiment, the automatic catalysis mechanism 6 is further included, the automatic catalysis mechanism 6 includes catalyst storage tank 61, first conveying pipe, first control machine valve 62 and infrared spectrum sensor 63, infrared spectrum sensor 63 is connected reaction kettle 1, catalyst storage tank 61 bottom is connected reaction kettle 1 through first conveying pipe, first control machine valve 62 is installed on first conveying pipe, and first control machine valve 62 and infrared spectrum sensor 63 are electrically connected single-chip microcomputer;

[0052] In use, the dielectric constant sensor 73 judges whether polymerization reaction occurs, if polymerization reaction occurs, the single-chip microcomputer drives the second control machine valve 72 to open, and the polymerization inhibitor in the polymerization inhibitor storage tank 71 is quantitatively introduced into the reaction kettle 1, to realize automatic polymerization inhibition.

[0053] The working principle of the utility model is as follows:

[0054] 1. Maleic anhydride and ethanol are fed into the reaction kettle 1 from two material inlets 3 at the upper part of the reaction kettle 1, and after the reaction is completed, they are discharged from the discharge port 5 at the bottom of the reaction kettle 1, so that they have sufficient residence time in the reaction kettle 1, the reaction kettle 1 is heated by the steam outer coil 42 to increase the reaction rate of maleic anhydride and ethanol, and if the temperature in the reaction kettle 1 is too high, the inner coil 41 can be cooled to ensure that the temperature in the reaction kettle 1 is always in a stable state;

[0055] 2. Automatic catalysis and polymerization inhibition are realized through the automatic catalysis mechanism 6 and the automatic polymerization inhibition mechanism 7, and the production efficiency of the product is improved.

[0056] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent transformation or direct or indirect application in the related technical field based on the content of the present application specification and drawings is also included in the patent protection range of the present application.

[0057] In addition, it should be understood that although the present application is described in the form of an embodiment, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pre-reactor based on the reaction of maleic anhydride and ethanol, characterized in that, It comprises a reaction kettle, a stirring mechanism and a temperature adjusting mechanism. Two material inlets are arranged on the top of the reaction kettle, and a material outlet is arranged on the bottom of the reaction kettle. The temperature adjusting mechanism comprises a cooling inner coil pipe and a steam outer coil pipe. The cooling inner coil pipe is arranged in the reaction kettle. The steam outer coil pipe is arranged on the bottom of the reaction kettle. The stirring mechanism is installed on the top of the reaction kettle and used for stirring the material in the reaction kettle.

2. A pre-reactor based on reaction of maleic anhydride and ethanol according to claim 1, characterized in that, The cooling inner coil pipe is in a spiral shape, cooling water is circulated in the cooling inner coil pipe, and the water inlet and the water outlet of the cooling inner coil pipe extend to the reaction kettle.

3. A pre-reactor based on reaction of maleic anhydride and ethanol according to claim 1, characterized in that, The steam outer coil pipe is in a spiral shape and is wound on the bottom of the outer wall of the reaction kettle, and hot steam is circulated in the steam outer coil pipe.

4. A pre-reactor based on reaction of maleic anhydride and ethanol according to claim 1, characterized in that, The stirring mechanism comprises a motor, a speed reducer, a stirring shaft and stirring blades, the motor is connected with the stirring shaft through the speed reducer, the stirring shaft extends into the reaction kettle, and a plurality of stirring blades are arranged on the stirring shaft.

5. A pre-reactor based on reaction of maleic anhydride and ethanol according to claim 1, characterized in that, An automatic catalysis mechanism is further arranged, which comprises a catalyst storage tank, a first conveying pipe, a first control valve and an infrared spectrum sensor, the infrared spectrum sensor is connected with the reaction kettle, the catalyst storage tank is connected with the reaction kettle through the first conveying pipe, the first control valve is installed on the first conveying pipe, and the first control valve and the infrared spectrum sensor are electrically connected with a single-chip microcomputer.

6. A pre-reactor based on reaction of maleic anhydride and ethanol according to claim 1, characterized in that, An automatic polymerization inhibition mechanism is further arranged, which comprises a polymerization inhibitor storage tank, a second conveying pipe, a second control valve and a dielectric constant sensor, the dielectric constant sensor is connected with the reaction kettle, the polymerization inhibitor storage tank is connected with the reaction kettle through the second conveying pipe, the second control valve is installed on the second conveying pipe, and the second control valve and the dielectric constant sensor are electrically connected with a single-chip microcomputer.

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