A device for dehydrating crude ethylene glycol dimethyl ether

Abstract

The utility model relates to material handling system technical field, concretely relates to a kind of for crude glycol dimethyl ether dewatering device, including material storage tank, waste liquid tank, vacuum buffer tank, liquefier, condenser, vacuum pump, dehydration processor, vaporizer and self-suction booster pump, the output end of material storage tank bottom is connected with the input end of vaporizer by pipe fitting;By liquid homogeneous phase separation mode, water vapor and glycol dimethyl ether steam are separated, glycol dimethyl ether dehydration is realized, without using strong base, so that liquid alkali and other byproducts will not be produced in dehydration process, avoid the potential harm of strong alkali to worker and equipment, also need not acidic medium treatment, reduce environmental protection pressure, simultaneously make dehydration operation have the possibility of continuous production, improve work efficiency, and the wastewater generated enters existing biochemical pool, need not to invest equipment and material for processing additionally, save cost.

Description

Technical Field

[0001] This utility model relates to the field of material handling system technology, specifically to a device for dehydrating crude ethylene glycol dimethyl ether. Background Technology

[0002] Dimethyl ethylene glycol ether (DME) is a solvent that is miscible with many organic solvents such as alcohols, ethers, ketones, esters, hydrocarbons, and chlorinated hydrocarbons. It can also form coordination compounds with many metal compounds and dissolve them. It can also dissolve gases such as SO2, chloromethane, and ethylene. It has a good dissolving ability for various celluloses and is commonly known as dimethyl cellosol (DME). It is chemically stable and does not easily react. It is stable to alkali metals and alkali metal hydrides below 150°C and can be used as a stabilizer and refining agent for lithium aluminum hydride. However, DME can react with HI, HBr, and concentrated H2SO4. It can decompose at high temperatures in the presence of acidic catalysts. DME does not react with less reactive Grignard reagents under normal conditions, such as methyl magnesium chloride, but it can decompose with more reactive Grignard reagents, such as methyl magnesium iodide, at 150–200°C.

[0003] During the synthesis of DME, due to its strong hydrophilicity, it is difficult to separate it from water. Most methods use strong base dehydration to remove water, but strong base dehydration produces byproducts such as alkali solution, and strong base poses a significant potential hazard to workers and requires high-quality equipment. Therefore, a dehydration device for crude ethylene glycol dimethyl ether is proposed. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a device for dehydrating crude ethylene glycol dimethyl ether.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a dehydration device for crude ethylene glycol dimethyl ether, comprising a material storage tank, a waste liquid tank, a vacuum buffer tank, a liquefier, a condenser, a vacuum pump, a dehydration processor, a vaporizer, and a self-priming booster pump. The output end of the bottom of the material storage tank is connected to the input end of the vaporizer via a pipe fitting. A storage tank valve is installed on the pipe fitting between the material storage tank and the vaporizer. The vaporizer vaporizes the material. The output end of the vaporizer is connected to the input end of the self-priming booster pump via a pipe fitting. The output end of the self-priming booster pump is connected to the input end of the dehydration processor. The self-priming booster pump sends the material into the processor. The output end of the dehydration processor is connected to the input ends of the liquefier and the condenser respectively. The liquefier liquefies the processed material and discharges it into the material storage tank. The output end of the condenser is connected to the input end of the waste liquid tank via a pipe fitting. The condenser condenses water vapor into liquid and sends it into the waste liquid tank. A vacuum system is connected to the upper part of the waste liquid tank.

[0006] Preferably, the vacuum system includes a vacuum buffer tank and a vacuum pump, with the upper part of the waste liquid tank connected to the vacuum buffer tank via a pipe, and the vacuum buffer tank connected to the vacuum pump via a pipe.

[0007] Preferably, the material storage tank shell has an insulation cavity inside, and the upper and lower ends of the insulation cavity are respectively connected to a water inlet and a water outlet. A material agitator is installed at the center of the top of the material storage tank, and the agitator rod extends into the material storage tank. A thermometer probe is installed inside the material storage tank.

[0008] Preferably, the bottom of the material storage tank is provided with a storage tank discharge port, the storage tank discharge port is provided with a storage tank discharge valve, the lower part of the material storage tank is provided with a sampling port, and the sampling port is provided with a sampling valve.

[0009] Preferably, the dehydration processor includes a stainless steel tank, a processor inlet, a processor outlet, a steam outlet, a baffle plate, and a ceramic membrane assembly. The stainless steel tank has a processor inlet and a processor outlet facing each other at both ends. The processor inlet is connected to the output end of a self-priming booster pump via a pipe fitting, and the processor outlet is connected to a liquefier via a pipe fitting. A ceramic membrane assembly is located at the center of the stainless steel tank. A baffle plate is arranged around the stainless steel tank inside the outer ring of the ceramic membrane assembly. A steam outlet is located on the stainless steel tank near the processor outlet. The steam outlet is connected to a condenser via a pipe fitting, and a condensation valve is provided between the steam outlet and the condenser.

[0010] Preferably, the dehydration processor further includes a processor insulation layer, the outer surface of the stainless steel tank is covered with the processor insulation layer, and a vaporization pressure gauge is provided between the processor inlet and the self-priming booster pump.

[0011] Preferably, the ceramic tube membrane assembly consists of multiple sets of ceramic tubes with a surface coated with a molecular sieve coating. The pore size of the ceramic tubes is larger than the diameter of a water molecule and smaller than the diameter of a ethylene glycol dimethyl ether molecule.

[0012] Preferably, the waste liquid tank is provided with a drain pipe at the bottom, a waste liquid tank valve is provided on the drain pipe, and a vacuum pressure gauge is provided on the vacuum buffer tank.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model separates water vapor and ethylene glycol dimethyl ether vapor through liquid homogeneous separation, thereby achieving the dehydration of ethylene glycol dimethyl ether without the use of strong alkali. This eliminates the production of byproducts such as liquid alkali during the dehydration process, avoiding potential hazards to workers and equipment from strong alkali. It also eliminates the need for acidic media treatment, reducing environmental pressure. At the same time, it enables continuous production of the dehydration operation, improving work efficiency. Furthermore, the wastewater generated enters the existing biological treatment tank, eliminating the need for additional equipment and materials for treatment, thus saving costs.

[0015] 2. In this utility model, through circulating liquid homogeneous separation, ethylene glycol dimethyl ether can be repeatedly distilled and dehydrated during dehydration, thereby ensuring the treatment effect of the dehydration device. In addition, the material storage tank is equipped with a material agitator to ensure that the ethylene glycol dimethyl ether can be preheated evenly before vaporization, which also facilitates vaporization. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the crude ethylene glycol dimethyl ether dehydration device of this utility model;

[0017] Figure 2 This is a schematic diagram of the dehydration processor in this utility model.

[0018] The numbers in the diagram represent:

[0019] 1. Material storage tank; 2. Waste liquid tank; 3. Vacuum buffer tank; 4. Liquefaction unit; 5. Condenser; 6. Vacuum pump; 7. Dehydrator; 71. Stainless steel tank body; 72. Processor inlet; 73. Processor outlet; 74. Steam outlet; 75. Processor insulation layer; 76. Baffle plate; 77. Ceramic membrane assembly; 8. Vaporizer; 9. Self-priming booster pump; 10. Vaporization pressure gauge; 11. Vacuum pressure gauge; 12. Condensation valve; 13. Storage tank valve; 14. Waste liquid tank valve; 15. Material agitator; 16. Thermometer probe; 17. Sampling valve; 18. Storage tank outlet valve. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, highlighting the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0021] Example:

[0022] like Figure 1-2As shown, this utility model provides a dehydration device for crude ethylene glycol dimethyl ether, including a material storage tank 1, a waste liquid tank 2, a vacuum buffer tank 3, a liquefier 4, a condenser 5, a vacuum pump 6, a dehydration processor 7, a vaporizer 8, and a self-priming booster pump 9. The output end of the bottom of the material storage tank 1 is connected to the input end of the vaporizer 8 through a pipe fitting. A storage tank valve 13 is installed on the pipe fitting between the material storage tank 1 and the vaporizer 8. The vaporizer 8 vaporizes the material, and the output end of the vaporizer 8 is connected to the input end of the self-priming booster pump 9 through a pipe fitting. The output end of the self-priming booster pump 9 is connected to the input end of the dewatering processor 7. The self-priming booster pump 9 sends the material into the dewatering processor 7. The output end of the dewatering processor 7 is connected to the input ends of the liquefier 4 and the condenser 5 respectively. The liquefier 4 liquefies the processed material and discharges it into the material storage tank 1. The output end of the condenser 5 is connected to the input end of the waste liquid tank 2 through a pipe fitting. The condenser 5 condenses water vapor into liquid and sends it into the waste liquid tank 2. The upper part of the waste liquid tank 2 is connected to a vacuum system to provide negative pressure, which facilitates material flow and processing.

[0023] In this embodiment, the vacuum system includes a vacuum buffer tank 3 and a vacuum pump 6. The upper part of the waste liquid tank 2 is connected to the vacuum buffer tank 3 through a pipe to ensure stable vacuum and prevent liquid backflow into the equipment. The vacuum buffer tank 3 is connected to the vacuum pump 6 through a pipe.

[0024] In this embodiment, an insulation cavity is provided inside the shell of the material storage tank 1. A water inlet and a water outlet are respectively connected to the upper and lower ends of the insulation cavity. A material agitator 15 is installed at the center of the top of the material storage tank 1. The stirring rod of the material agitator 15 extends into the material storage tank 1. A thermometer probe 16 is installed inside the material storage tank 1. The thermometer probe 16 is connected to a thermometer for real-time monitoring and display of the material temperature inside the material storage tank 1.

[0025] In this embodiment, a storage tank outlet is provided at the bottom of the material storage tank 1, and a storage tank outlet valve 18 is provided on the storage tank outlet. A sampling port is provided at the lower part of the material storage tank 1, and a sampling valve 17 is provided on the sampling port.

[0026] In this embodiment, the dehydration processor 7 includes a stainless steel tank 71, a processor inlet 72, a processor outlet 73, a steam outlet 74, a baffle plate 76, and a ceramic membrane assembly 77. The stainless steel tank 71 has a processor inlet 72 and a processor outlet 73 facing each other at both ends. The processor inlet 72 is connected to the output end of the self-priming booster pump 9 through a pipe fitting, and the processor outlet 73 is connected to the liquefier 4 through a pipe fitting. The ceramic membrane assembly 77 is located at the center of the stainless steel tank 71. The baffle plate 76 is arranged around the inside of the stainless steel tank 71 around the ceramic membrane assembly 77. A steam outlet 74 is located on the stainless steel tank 71 near the processor outlet 73. One end of the steam outlet 74 is connected to the inside of the ceramic membrane assembly 77, and the other end of the steam outlet 74 is connected to the condenser 5 through a pipe fitting. A condensation valve 12 is provided between the steam outlet 74 and the condenser 5.

[0027] In this embodiment, the dehydration processor 7 also includes a processor insulation layer 75. The outer surface of the stainless steel tank 71 is covered with the processor insulation layer 75. A vaporization pressure gauge 10 is provided between the processor inlet 72 and the self-priming booster pump 9 to facilitate the control of vaporization.

[0028] In this embodiment, the ceramic tube membrane assembly 77 is composed of multiple sets of ceramic tubes with molecular sieve coatings on their surfaces. The pore size of the ceramic tubes is larger than the diameter of water molecules and smaller than the diameter of ethylene glycol dimethyl ether molecules. The ceramic tube membrane assembly 77 can also be selected from other membrane assemblies suitable for separating homogeneous liquid mixtures.

[0029] In this embodiment, a drain pipe is provided at the bottom of the waste liquid tank 2, and a waste liquid tank valve 14 is provided on the drain pipe. A vacuum pressure gauge 11 is provided on the vacuum buffer tank 3 to monitor the vacuum level inside the vacuum buffer tank 3.

[0030] Working Principle: In the Williamson process for synthesizing ethylene glycol dimethyl ether, ethylene glycol dimethyl ether reacts with chloromethane under strong alkali conditions: CH3OCH2CH2OH + NaOH + CH3Cl → CH3OCH2CH2OCH3 + H2O + NaCl. Water is produced during the reaction. The reaction solution is crudely distilled to obtain crude ethylene glycol dimethyl ether, which contains approximately 7% water. This crude product is discharged into material storage tank 1. Warm water is then added to the insulation chamber through the inlet. After filling and initial heat exchange, water is continuously discharged through the outlet and continuously added through the inlet, creating a flowing water flow to maintain the preheating temperature. When the thermometer probe 16 detects a decrease in the internal temperature of material storage tank 1, the temperature of the warm water is increased. The warm water temperature is 20-30°C lower than the boiling point of ethylene glycol dimethyl ether, preheating the material to 50-55°C. Then, the storage tank valve 13 is opened to allow the material to enter the vaporizer 8 for vaporization. The steam is 145℃. After vaporization, the material pressure is maintained at 0.2-0.3 MPa. Under the action of the self-priming booster pump 9, it enters the stainless steel tank 71 through the processor inlet 72. The high-temperature steam flows in the outer cavity of the stainless steel tank 71 under the action of the guide plate 76. Among them, water vapor enters the inner cavity of the ceramic tube membrane assembly 77 under negative pressure, and then enters the condenser 5 for condensation through the water vapor outlet 74 and the condensation valve 12. The condensate is stored in the waste tank 2. Ethylene glycol dimethyl ether vapor cannot pass through the ceramic tube membrane assembly 77. It enters the liquefaction unit 4 through the processor outlet 73 and is liquefied into a high-temperature liquid for further vaporization. After two cycles are completed, the sampling valve 17 is opened. After sampling and testing, if the moisture content meets the standard for the next distillation step, the material processing can be stopped. The storage tank outlet valve 18 is opened, and the material enters the distillation kettle through the outlet for further distillation.

[0031] The above description is merely a preferred embodiment of the present utility model and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present utility model, all of which will fall within the protection scope of the present utility model.

Claims

1. A device for dehydrating crude ethylene glycol dimethyl ether, characterized in that, The system includes a material storage tank (1), a waste liquid tank (2), a vacuum buffer tank (3), a liquefier (4), a condenser (5), a vacuum pump (6), a dehydration processor (7), a vaporizer (8), and a self-priming booster pump (9). The output end of the bottom of the material storage tank (1) is connected to the input end of the vaporizer (8) through a pipe fitting. A storage tank valve (13) is installed on the pipe fitting between the material storage tank (1) and the vaporizer (8). The vaporizer (8) vaporizes the material. The output end of the vaporizer (8) is connected to the input end of the self-priming booster pump (9) through a pipe fitting. The output end of the self-priming booster pump (9) is connected to the input end of the dehydration processor (7). The self-priming booster pump (9) sends the material into the processor (7). The output end of the dehydration processor (7) is connected to the input ends of the liquefier (4) and the condenser (5) respectively. The liquefier (4) liquefies the processed material and discharges it into the material storage tank (1). The output end of the condenser (5) is connected to the input end of the waste liquid tank (2) through a pipe. The condenser (5) condenses water vapor into liquid and sends it into the waste liquid tank (2). The upper part of the waste liquid tank (2) is connected to a vacuum system.

2. The apparatus for dehydrating crude ethylene glycol dimethyl ether as described in claim 1, characterized in that, The vacuum system includes a vacuum buffer tank (3) and a vacuum pump (6). The upper part of the waste liquid tank (2) is connected to the vacuum buffer tank (3) through a pipe, and the vacuum buffer tank (3) is connected to the vacuum pump (6) through a pipe.

3. The apparatus for dehydrating crude ethylene glycol dimethyl ether as described in claim 1, characterized in that, The material storage tank (1) has an insulation cavity inside its shell. The upper and lower ends of the insulation cavity are respectively connected to a water inlet and a water outlet. A material agitator (15) is installed at the center of the top of the material storage tank (1). The stirring rod of the material agitator (15) extends into the material storage tank (1). A thermometer probe (16) is installed inside the material storage tank (1).

4. The apparatus for dehydrating crude ethylene glycol dimethyl ether as described in claim 1, characterized in that, The bottom of the material storage tank (1) is provided with a storage tank outlet pipe, and the storage tank outlet pipe is provided with a storage tank outlet valve (18). The lower part of the material storage tank (1) is provided with a sampling pipe, and the sampling pipe is provided with a sampling valve (17).

5. The apparatus for dehydrating crude ethylene glycol dimethyl ether as described in claim 1, characterized in that, The dehydration processor (7) includes a stainless steel tank (71), a processor inlet (72), a processor outlet (73), a steam outlet (74), a baffle plate (76), and a ceramic membrane assembly (77). The stainless steel tank (71) has a processor inlet (72) and a processor outlet (73) facing each other at both ends. The processor inlet (72) is connected to the output end of a self-priming booster pump (9) via a pipe fitting. The processor outlet (73) is connected to a liquefier (4) via a pipe fitting. The interior of the stainless steel tank (71) contains… A ceramic tube membrane assembly (77) is provided at the core position. A guide plate (76) is arranged around the stainless steel tank (71) on the outer ring of the ceramic tube membrane assembly (77). A steam outlet (74) is provided on the stainless steel tank (71) near the discharge port (73) of the processor. One end of the steam outlet (74) is connected to the inside of the ceramic tube membrane assembly (77), and the other end of the steam outlet (74) is connected to the condenser (5) through a pipe fitting. A condensation valve (12) is provided between the steam outlet (74) and the condenser (5).

6. The apparatus for dehydrating crude ethylene glycol dimethyl ether as described in claim 5, characterized in that, The dehydration processor (7) also includes a processor insulation layer (75). The outer surface of the stainless steel tank (71) is covered with the processor insulation layer (75). A vaporization pressure gauge (10) is provided between the processor inlet (72) and the self-priming booster pump (9).

7. The apparatus for dehydrating crude ethylene glycol dimethyl ether as described in claim 5, characterized in that, The ceramic tube membrane assembly (77) consists of multiple sets of ceramic tubes with molecular sieve coatings on their surfaces. The pore size of the ceramic tubes is larger than the diameter of a water molecule and smaller than the diameter of a ethylene glycol dimethyl ether molecule.

8. The apparatus for dehydrating crude ethylene glycol dimethyl ether as described in claim 2, characterized in that, The waste liquid tank (2) is provided with a drain pipe at the bottom, and a waste liquid tank valve (14) is provided on the drain pipe. The vacuum buffer tank (3) is provided with a vacuum pressure gauge (11).

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