Epoxy resin production process and production equipment capable of reducing water consumption

Abstract

The invention relates to an epoxy resin production process and production equipment capable of reducing water consumption. The production process comprises the following steps: S1, preparing reaction raw materials of epoxy resin and a sodium hydroxide aqueous solution, adding the reaction raw materials of epoxy resin and the sodium hydroxide aqueous solution into a reaction container, and carrying out catalytic reaction to obtain a reaction product; s2, after the reaction is completed, water in a reaction product and epichlorohydrin are azeotropic to form steam, and water and most epichlorohydrin in the reaction product are removed; s3, filtering is carried out; and S4, distilling, and removing the remaining epoxy chloropropane to obtain the epoxy resin. According to the method, excessive ECH is utilized to take away water in a reaction system, so that water in a reaction product can be effectively removed, NaCl in the reaction product is separated out, the NaCl is more easily removed from the reaction product, and then the ECH is removed in an evaporation manner; the product yield and quality are effectively improved; the phenomenon that a large amount of water is consumed when the product is cleaned is avoided, and the amount of generated waste water is also reduced.

Description

Technical Field

[0001] The invention relates to the field of epoxy resin, and in particular to an epoxy resin production process and production equipment that reduces water consumption. Background Art

[0002] Epoxy resin, as an important raw material for composite matrix, plays a vital role in fiberglass products and carbon fiber composite materials. Due to its strong bonding force and mechanical properties, it is widely used in aerospace, sporting goods, electronic appliances and other fields. However, the treatment of large amounts of wastewater generated during the reaction and water washing in the production process of epoxy resin has become a major problem.

[0003] At present, sodium hydroxide solution is mostly used in the epoxy resin production reaction process, and a large amount of water is used for washing at the end of the reaction, resulting in the generation of a large amount of wastewater, which puts great pressure on subsequent water treatment and environmental protection. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an epoxy resin production process and production equipment with reduced water consumption, which utilizes excess ECH to take away water in the reaction system, effectively removes water from the reaction product, and also allows NaCl in the reaction product to precipitate, making it easier to remove NaCl from the reaction product, and then removes ECH by evaporation; effectively improves the product yield and quality; avoids consuming a large amount of water due to cleaning the product, and also reduces the amount of wastewater generated.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a production process of epoxy resin with reduced water consumption, comprising the following steps:

[0006] S1. Prepare reaction raw materials of epoxy resin and sodium hydroxide aqueous solution, add the reaction raw materials of epoxy resin and sodium hydroxide aqueous solution into a reaction container, catalyze reaction, and obtain a reaction product; wherein the reaction raw materials include epichlorohydrin;

[0007] S2. After the reaction is completed, the water in the reaction product obtained in step S1 is azeotroped with epichlorohydrin to form steam, and the water and most of the epichlorohydrin in the reaction product are removed; wherein the water and most of the epichlorohydrin in the reaction product are removed by azeotroping epichlorohydrin and water; sodium chloride solid will precipitate from the reaction product due to the removal of water;

[0008] S3, filtering the reaction product after being treated in step S2 to remove the sodium chloride solid;

[0009] S4, distilling the reaction product after the treatment in step S3 to remove the remaining epichlorohydrin to obtain epoxy resin.

[0010] Furthermore, in step S2, the azeotropic vapor of water and epichlorohydrin produced is condensed to obtain a liquid mixture of water and epichlorohydrin, and the water and epichlorohydrin are separated and collected separately.

[0011] Furthermore, in step S4, the epichlorohydrin vapor produced by distillation is condensed and collected.

[0012] An epoxy resin production equipment comprises a reactor, a first condenser, a water separator, a centrifuge, a first storage tank, a thin film evaporator, a second condenser and a second storage tank; the inlet end of the first condenser is connected to the reactor; the inlet end of the water separator is connected to the outlet end of the first condenser; the discharge end of the reactor is connected to the inlet end of the centrifuge, the outlet end of the centrifuge is connected to the feed end of the first storage tank, the discharge end of the first storage tank is connected to the feed end of the thin film evaporator; the gas outlet end of the thin film evaporator is connected to the inlet end of the second condenser, and the liquid outlet end is connected to the feed end of the second storage tank; the reactor is used as a synthesis The invention relates to a reaction container for epoxy resin; the first condenser is used to condense the azeotropic vapor of water and epichlorohydrin produced after the reaction in the reactor is completed; the water separator is used to receive the liquid condensed by the first condenser and separate the water from the epichlorohydrin; the centrifuge is used to centrifuge the reaction product output by the reactor and output the filtered reaction product to the first storage tank; the thin film evaporator is used to evaporate the reaction product output by the first storage tank; the second condenser is used to condense the gas evaporated by the thin film evaporator; the second storage tank is used to receive and store the reaction product evaporated by the thin film evaporator.

[0013] Furthermore, the production equipment also includes an ECH buffer tank, and the lower outlet end of the water distributor is connected to the ECH buffer tank.

[0014] Furthermore, the production equipment also includes a water buffer tank, and the upper outlet end of the water distributor is connected to the water buffer tank.

[0015] Furthermore, a stirring device is also provided in the reactor.

[0016] Furthermore, the production equipment also includes an ECH storage tank, and the outlet end of the second condenser is connected to the ECH storage tank.

[0017] Advantages of the present invention: The present invention provides an epoxy resin production process and production equipment for reducing water consumption, using excess ECH to take away water in the reaction system, which can effectively remove water from the reaction product, and also allows NaCl in the reaction product to precipitate, making it easier to remove NaCl from the reaction product, and then remove ECH by evaporation; effectively improving the product yield and quality; avoiding the consumption of a large amount of water due to cleaning the product, and also reducing the amount of wastewater generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a process for producing epoxy resin with reduced water consumption according to an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a production device of an embodiment;

[0020] Among them, 1-reactor, 2-first condenser, 3-water separator, 4-ECH buffer tank, 5-water buffer tank, 6-centrifuge, 7-first storage tank, 8-thin film evaporator, 9-second condenser, 10-ECH storage tank, 11-second storage tank. DETAILED DESCRIPTION

[0021] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0022] Example

[0023] like Figure 1 and Figure 2 As shown, this embodiment provides an epoxy resin production process with reduced water consumption, comprising the following steps:

[0024] S1. Prepare reaction raw materials of epoxy resin and sodium hydroxide aqueous solution, add the reaction raw materials of epoxy resin and sodium hydroxide aqueous solution into a reaction container, catalyze reaction, and obtain a reaction product; wherein the reaction raw materials include epichlorohydrin;

[0025] S2. After the reaction is completed, the water in the reaction product obtained in step S1 is azeotroped with epichlorohydrin to form steam, and the water and most of the epichlorohydrin in the reaction product are removed; wherein the water and most of the epichlorohydrin in the reaction product are removed by azeotroping epichlorohydrin and water; sodium chloride solid will precipitate from the reaction product due to the removal of water;

[0026] S3, filtering the reaction product after being treated in step S2 to remove the sodium chloride solid;

[0027] S4, distilling the reaction product after the treatment in step S3 to remove the remaining epichlorohydrin to obtain epoxy resin.

[0028] In a process for producing epoxy resin with reduced water consumption of the present embodiment, in step S2, the azeotropic vapor of water and epichlorohydrin produced is condensed to obtain a liquid mixture of water and epichlorohydrin, and the water and epichlorohydrin are separated and collected separately.

[0029] In the epoxy resin production process for reducing water consumption of this embodiment, in step S4, epichlorohydrin vapor generated by distillation is condensed and collected.

[0030] The present embodiment also provides an epoxy resin production device, including a reactor 1, a first condenser 2, a water separator 3, a centrifuge 6, a first storage tank 7, a thin film evaporator 8, a second condenser 9, and a second storage tank 11; the inlet end of the first condenser 2 is connected to the reactor 1; the inlet end of the water separator 3 is connected to the outlet end of the first condenser 2; the discharge end of the reactor 1 is connected to the inlet end of the centrifuge, the outlet end of the centrifuge is connected to the feed end of the first storage tank 7, and the discharge end of the first storage tank 7 is connected to the feed end of the thin film evaporator 8; the gas outlet end of the thin film evaporator 8 is connected to the inlet end of the second condenser 9, and the liquid outlet end is connected to the feed end of the second storage tank 11; the reactor The kettle 1 is used as a reaction container for synthesizing epoxy resin; the first condenser 2 is used to condense the azeotropic vapor of water and epichlorohydrin produced after the reaction in the reactor 1 is completed; the water separator 3 is used to receive the liquid condensed by the first condenser 2 and separate the water from the epichlorohydrin; the centrifuge 6 is used to centrifuge the reaction product output by the reactor 1, and output the filtered reaction product to the first storage tank 7; the thin film evaporator 8 is used to evaporate the reaction product output by the first storage tank 7; the second condenser 9 is used to condense the gas evaporated by the thin film evaporator 8; the second storage tank 11 is used to receive and store the reaction product evaporated by the thin film evaporator 8.

[0031] In an epoxy resin production device of this embodiment, the production device further includes an ECH buffer tank 4, and the lower outlet end of the water separator 3 is connected to the ECH buffer tank 4. The ECH buffer tank 4 is used to receive and store epichlorohydrin (ECH) output by the water separator 3 after the reaction is completed.

[0032] In the epoxy resin production equipment of this embodiment, the production equipment further includes a water buffer tank 5, and the upper outlet end of the water distributor 3 is connected to the water buffer tank 5. The water buffer tank 5 is used to receive and store water output from the water distributor 3 after the reaction is completed.

[0033] In the epoxy resin production equipment of this embodiment, a stirring device is also provided in the reactor 1. In this embodiment, the stirring device provides stirring conditions for the reaction in the reactor.

[0034] In an epoxy resin production device of this embodiment, the production device further includes an ECH storage tank 10, and the outlet end of the second condenser 9 is connected to the ECH storage tank 10. In this embodiment, the ECH storage tank 10 is used to receive and store epichlorohydrin (ECH) separated from the reaction product by evaporation.

[0035] In this embodiment, taking bisphenol A and ECH as reaction raw materials, bisphenol A and ECH are added to the reactor 1, and stirred and mixed evenly by a stirring device; then, an aqueous sodium hydroxide solution is added to the reactor, and the reaction is carried out under stirring; after the reaction is completed, the ECH in the reaction product is azeotropically treated with water (at this time, ECH is still in excess relative to water), and the formed mixed vapor is condensed by the first condenser 2, and then separated by the water separator 3; the separated ECH is output to the ECH buffer tank 4, and the separated water is output to the water buffer tank 5. This process can remove water and most of the ECH in the reaction product; and due to the removal of water in the reaction product, NaCl in the reaction product is precipitated as a solid; then, the precipitated NaCl solid is removed by a centrifuge; then, the ECH in the reaction product is evaporated and removed by a thin film evaporator, and the remaining ECH in the reaction product is removed to obtain the final epoxy resin product.

[0036] In this embodiment, after the reaction is completed, the azeotropic vapor of ECH and water continues to be formed, and the excess ECH is used to take away the water in the reaction system, which can effectively remove the water in the reaction product, and also makes the NaCl in the reaction product precipitate, making it easier to remove NaCl from the reaction product, and then remove ECH by evaporation; effectively improve the product yield and quality; avoid consuming a large amount of water due to washing the product, and also reduce the amount of wastewater generated.

[0037] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion shall fall within the protection scope of the present invention.

Claims

1. A process for producing epoxy resin with reduced water consumption, characterized in that: The following steps are involved: S1. Prepare reaction raw materials of epoxy resin and sodium hydroxide aqueous solution, add the reaction raw materials of epoxy resin and sodium hydroxide aqueous solution into a reaction container, catalyze reaction, and obtain a reaction product; wherein the reaction raw materials include epichlorohydrin; S2. After the reaction is completed, the water in the reaction product obtained in step S1 is azeotroped with epichlorohydrin to form steam, and the water and most of the epichlorohydrin in the reaction product are removed; wherein the water and most of the epichlorohydrin in the reaction product are removed by azeotroping epichlorohydrin and water; sodium chloride solid will precipitate from the reaction product due to the removal of water; S3, filtering the reaction product after being treated in step S2 to remove the sodium chloride solid; S4, distilling the reaction product after the treatment in step S3 to remove the remaining epichlorohydrin to obtain epoxy resin.

2. The epoxy resin production process for reducing water consumption according to claim 1, characterized in that: In step S2, the azeotropic vapor of water and epichlorohydrin produced is condensed to obtain a liquid mixture of water and epichlorohydrin, and the water and epichlorohydrin are separated and collected respectively.

3. The epoxy resin production process for reducing water consumption according to claim 1, characterized in that: In step S4, epichlorohydrin vapor produced by distillation is condensed and collected.

4. The production equipment used in the epoxy resin production process for reducing water consumption as claimed in claim 1, characterized in that: The invention comprises a reactor, a first condenser, a water separator, a centrifuge, a first storage tank, a thin film evaporator, a second condenser and a second storage tank; the inlet end of the first condenser is connected to the reactor; the inlet end of the water separator is connected to the outlet end of the first condenser; the discharge end of the reactor is connected to the inlet end of the centrifuge, the outlet end of the centrifuge is connected to the feed end of the first storage tank, the discharge end of the first storage tank is connected to the feed end of the thin film evaporator; the gas outlet end of the thin film evaporator is connected to the inlet end of the second condenser, and the liquid outlet end is connected to the feed end of the second storage tank; the reactor is used as a catalyst for synthesizing epoxy resin reaction vessel; the first condenser is used to condense the azeotropic vapor of water and epichlorohydrin produced after the reaction in the reactor is completed; the water separator is used to receive the liquid condensed by the first condenser and separate the water from the epichlorohydrin; the centrifuge is used to centrifuge the reaction product output by the reactor and output the filtered reaction product to the first storage tank; the thin film evaporator is used to evaporate the reaction product output by the first storage tank; the second condenser is used to condense the gas evaporated by the thin film evaporator; the second storage tank is used to receive and store the reaction product evaporated by the thin film evaporator.

5. The production equipment according to claim 4, characterized in that: The production equipment also includes an ECH buffer tank, and the lower outlet end of the water distributor is connected to the ECH buffer tank.

6. The production equipment according to claim 4, characterized in that: The production equipment also includes a water buffer tank, and the upper outlet end of the water distributor is connected to the water buffer tank.

7. The production equipment according to claim 4, characterized in that: The reactor is also provided with a stirring device.

8. The production equipment according to claim 4, characterized in that: The production equipment also includes an ECH storage tank, and the outlet end of the second condenser is connected to the ECH storage tank.

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