A dimethyl ether purification system

Abstract

The utility model discloses a dimethyl ether purification system, including an adsorption unit, a distillation unit and a collection unit. Gas phase dimethyl ether raw material enters the adsorption unit, passes through the adsorbers connected in series in sequence, and is adsorbed by the adsorbers to remove some impurities. The raw material after adsorption treatment is input into the distillation unit, and is heated and distilled by the heater after entering the distillation tower, and then cooled by the condenser, and some light component impurities are removed at the same time. The gas raw material after distillation is passed into the collection unit and enters the collection bottle located in the cold trap tank to achieve low-temperature collection. The utility model performs preliminary purification to remove some impurities through early adsorption, reduces the concentration of gas impurities before entering the distillation tower, reduces the distillation load, and finally removes non-condensable gases through cold trap collection, and the purification effect is stable and efficient. The adsorption unit, distillation unit and collection unit of the utility model are all detachably connected to the connecting pipeline, and the adsorption unit, distillation unit and collection unit can be flexibly adjusted by using the connecting pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of gas purification equipment and peripheral supporting facilities thereof, in particular to a dimethyl ether purification system. Background Art

[0002] As the "clean fuel of the 21st century", dimethyl ether has attracted wide attention for its advantages such as high cetane number, complete combustion and easy storage. In addition, dimethyl ether is also an important raw material for the production of many high-value chemicals. High-purity dimethyl ether can ensure the stability and reliability of the experiment, so the purity requirements for dimethyl ether are gradually increasing.

[0003] The impurities in dimethyl ether mainly include N2, O2, CH4, CO, CO2, H2O, etc. The purification devices in the prior art can only remove some impurities, so that the purity of dimethyl ether cannot meet the requirements of subsequent production, experiments, etc. Utility Model Content

[0004] The utility model aims to provide a dimethyl ether purification system to solve the problems existing in the above-mentioned prior art, improve the purification efficiency and realize the production of high-purity dimethyl ether.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a dimethyl ether purification system, comprising:

[0007] An adsorption unit, the adsorption unit is connected to the dimethyl ether raw material, and the adsorption unit includes at least two groups of adsorbers arranged in series to adsorb impurities in the raw material;

[0008] A distillation unit, the distillation unit comprising a distillation tower, a heater and a condenser, the outlet of the adsorber is connected to the inlet of the distillation tower, the heater can heat the raw materials entering the distillation tower, and the condenser cools and condenses the heated raw materials to remove light component impurities in the raw materials;

[0009] A collecting unit, the collecting unit comprising a cold trap tank and a collecting bottle arranged in the cold trap tank, the collecting bottle being connected to the gas phase outlet of the distillation tower;

[0010] The adsorption unit, the distillation unit and the collection unit are all connected by a connecting pipeline, and the adsorption unit, the distillation unit and the collection unit are all detachably connected to the connecting pipeline.

[0011] Preferably, the adsorber is filled with an adsorbent or a metal catalyst;

[0012] The adsorbent includes one or more of the following substances: molecular sieve, activated carbon, silica gel;

[0013] The metal catalyst is a copper-based catalyst, a platinum-based catalyst or a metal organic framework material.

[0014] Preferably, when the adsorbent is activated carbon, the adsorbent is coconut shell charcoal, resin-based charcoal, wood charcoal or commercial charcoal;

[0015] When the adsorbent is a molecular sieve, the adsorbent is a 3A molecular sieve, a 5A molecular sieve or a 13X molecular sieve;

[0016] The adsorbent is in the form of spheres, rings, cubes or special-shaped particles.

[0017] Preferably, a filter is arranged between the adsorption unit and the distillation unit; when there are multiple groups of filters, all the filters are arranged in series.

[0018] Preferably, the filler in the distillation tower is one or more of the following: Raschig rings, Pall rings, step rings, and saddle rings.

[0019] Preferably, the heater is located at the bottom of the distillation tower, the condenser is arranged at the top of the distillation tower, and the connection between the adsorption unit and the distillation tower is arranged close to the heater. The heating medium in the heater can exchange heat with the raw material entering the distillation tower to heat the raw material entering the distillation tower, and the condensing medium in the condenser can exchange heat with the heated raw material in the distillation tower.

[0020] Preferably, the heating medium and the condensing medium are both dimethyl silicone oil.

[0021] Preferably, the collection unit also includes a weighing mechanism, which is arranged at the bottom of the cold trap tank, and is used to monitor the mass of the cold trap tank and the collection bottle; the collection bottle is also connected to a venting pipeline, which is connected to the external environment, and a venting valve is provided on the venting pipeline.

[0022] Preferably, each of the connecting pipelines is provided with a control valve;

[0023] The dimethyl ether purification system further comprises a purge pipeline, on which a vacuum pump and a protective gas source are arranged. The purge pipeline can be connected to the connecting pipeline and transport the protective gas into the connecting pipeline.

[0024] Compared with the prior art, the utility model has achieved the following technical effects: the dimethyl ether purification system of the utility model includes an adsorption unit, a distillation unit and a collection unit, the adsorption unit is connected with the dimethyl ether raw material, the adsorption unit includes at least two groups of adsorbers arranged in series to adsorb impurities in the raw material; the distillation unit includes a distillation tower, a heater and a condenser, the outlet of the adsorber is connected with the inlet of the distillation tower, the heater can heat the raw material entering the distillation tower, and the condenser cools and condenses the heated raw material to remove light component impurities in the raw material; the collection unit includes a cold trap tank and a collection bottle arranged in the cold trap tank, and the collection bottle is connected with the gas phase outlet of the distillation tower; the adsorption unit, the distillation unit and the collection unit are all connected by connecting pipelines, and the adsorption unit, the distillation unit and the collection unit are all detachably connected to the connecting pipelines.

[0025] When the dimethyl ether purification system of the utility model is working, the gaseous dimethyl ether raw material enters the adsorption unit, passes through the adsorbers connected in series in sequence, and is adsorbed by the adsorbers to remove some impurities. The raw material after adsorption treatment is input into the distillation unit, and is heated and distilled by the heater after entering the distillation tower, and then cooled by the condenser, and some light component impurities are removed at the same time. The gas raw material after distillation is passed into the collection unit and enters the collection bottle located in the cold trap tank to achieve low-temperature collection. The utility model performs preliminary purification to remove some impurities through early adsorption, reduces the concentration of gas impurities before entering the distillation tower, reduces the distillation load, and finally removes non-condensable gases through cold trap collection, and finally obtains 5N purity dimethyl ether. The purity of dimethyl ether can reach 99.999%, and the purification effect is stable and efficient. It should also be noted that the adsorption unit, distillation unit and collection unit of the utility model are all connected by connecting pipelines, and the adsorption unit, distillation unit and collection unit are all detachably connected to the connecting pipelines. In actual applications, the adsorption unit, distillation unit and collection unit can be flexibly adjusted by connecting pipelines, for example, multiple groups of distillation units can be set up, or distillation units can be removed, etc., to meet different purification conditions and improve the flexibility and adaptability of the purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the structure of the dimethyl ether purification system disclosed in the embodiment of the utility model.

[0028] In the figure: 1. Raw material tank; 2. Adsorber; 3. Filter; 4. Distillation tower; 5. Heater; 6. Condenser; 7. Cold trap tank; 8. Collecting bottle; 9. Weighing mechanism; 10. Connecting pipeline; 11. Vacuum pump; 12. Purge pipeline. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The utility model aims to provide a dimethyl ether purification system to solve the problems existing in the above-mentioned prior art, improve the purification efficiency and realize the production of high-purity dimethyl ether.

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] The utility model provides a dimethyl ether purification system, comprising an adsorption unit, a distillation unit and a collection unit. The adsorption unit is connected with a dimethyl ether raw material, and the adsorption unit comprises at least two groups of adsorbers 2 arranged in series to adsorb impurities in the raw material; the distillation unit comprises a distillation tower 4, a heater 5 and a condenser 6, the outlet of the adsorber 2 is connected with the inlet of the distillation tower 4, the heater 5 can heat the raw material entering the distillation tower 4, and the condenser 6 cools and condenses the heated raw material to remove light component impurities in the raw material; the collection unit comprises a cold trap tank 7 and a collection bottle 8 arranged in the cold trap tank 7, and the collection bottle 8 is connected with the gas phase outlet of the distillation tower 4; the adsorption unit, the distillation unit and the collection unit are all connected by a connecting pipeline 10, and the adsorption unit, the distillation unit and the collection unit are all detachably connected to the connecting pipeline 10.

[0033] When the dimethyl ether purification system of the utility model is working, the gaseous dimethyl ether raw material enters the adsorption unit, passes through the adsorber 2 connected in series in sequence, and is adsorbed by the adsorber 2 to remove some impurities. The raw material after adsorption treatment is input into the distillation unit, enters the distillation tower 4, is heated and distilled by the heater 5, and then cooled by the condenser 6, while removing some light component impurities. The gas raw material after distillation is passed into the collection unit, and enters the collection bottle 8 located in the cold trap tank 7 to achieve low-temperature collection. The utility model performs preliminary purification to remove some impurities through early adsorption, reduces the concentration of gas impurities before entering the distillation tower 4, reduces the distillation load, and finally removes non-condensable gases through cold trap collection, and finally obtains 5N purity dimethyl ether. The purity of dimethyl ether can reach 99.999%, and the purification effect is stable and efficient. It should also be noted that the adsorption unit, distillation unit and collection unit of the utility model are all connected by connecting pipe 10, and the adsorption unit, distillation unit and collection unit are all detachably connected to the connecting pipe 10. In practical applications, the adsorption unit, distillation unit and collection unit can be flexibly adjusted by connecting pipe 10, such as setting multiple groups of distillation units, or removing distillation units, etc., to meet different purification conditions and improve the flexibility and adaptability of the purification system. It should be explained that the crude dimethyl ether raw material can be stored in the raw material tank 1, the raw material tank 1 is connected to the adsorption unit, or the adsorption unit is connected to other sources of crude dimethyl ether raw material.

[0034] It should be noted that the adsorber 2 is filled with an adsorbent or a metal catalyst to remove impurities in the dimethyl ether raw material by adsorption, or the metal catalyst is used to adsorb impurity molecules and activate them to remove some impurities in the crude dimethyl ether raw material.

[0035] Among them, the adsorbent includes one or more of the following substances: molecular sieve, activated carbon, silica gel; the metal catalyst is a copper-based catalyst, a platinum-based catalyst or a metal organic framework material. In practical applications, according to the actual purification needs and other specific working conditions, a suitable adsorbent or metal catalyst can be selected to adapt to different purification conditions, ensure the purification effect, and save the purification cost.

[0036] In addition, when the adsorbent is activated carbon, the adsorbent is coconut shell charcoal, resin-based charcoal, wood charcoal or commercial charcoal; different adsorbents can also be combined according to actual working conditions to meet adsorption requirements.

[0037] When the adsorbent is a molecular sieve, the adsorbent is a 3A molecular sieve, a 5A molecular sieve or a 13X molecular sieve; in addition, the adsorbent is a spherical, annular, cubic or irregular particle.

[0038] It should be explained here that in actual application, the number of adsorbers 2 can be adjusted according to the actual purification requirements, and the adsorbent or metal catalyst in each adsorber 2 can be selected to be the same type or different types, so as to adsorb impurities in the crude dimethyl ether raw material in a targeted manner. In this specific embodiment, three groups of adsorbers 2 are set. Along the conveying direction of the raw material, the first group of adsorbers 2 is filled with one or more of 3A molecular sieve, 5A molecular sieve or silica gel, which is used to pre-remove the moisture in the crude dimethyl ether raw material; the second group of adsorbers 2 is filled with one or more of 3A molecular sieve, 5A molecular sieve or activated carbon for deep dehydration; the third group of adsorbers 2 is filled with one or more of activated carbon, 13X molecular sieve or metal catalyst, which is used to remove CO, CO2, CH4, N2, O2 impurities.

[0039] At the same time, the metal organic framework material is a porous material with controllable morphology and pore structure formed by self-assembly of metal and organic ligand. When the adsorber 2 is filled with the gold metal organic framework material, the metal organic framework material can absorb impurities in the raw materials to ensure the purification effect of the system.

[0040] In order to prevent the adsorbent and other granular powder impurities from entering the distillation tower 4, a filter 3 is arranged between the adsorption unit and the distillation unit to effectively prevent the adsorbent from entering the distillation tower 4 along with the raw materials, thereby ensuring the normal operation of the distillation tower 4. In practical applications, multiple groups of filters 3 may be arranged. When there are multiple groups of filters 3, all filters 3 are arranged in series, and the filtering levels of the multiple groups of filters 3 may be successively increased to further enhance the filtering effect.

[0041] It should be noted that the filler in the distillation tower 4 is one or more of the following: Raschig rings, ball rings, step rings, and saddle rings. The filler can be selected according to the actual working conditions to improve the distillation efficiency and promote the separation of impurities.

[0042] Specifically, the heater 5 is located at the bottom of the distillation tower 4, the condenser 6 is arranged at the top of the distillation tower 4, and the connection between the adsorption unit and the distillation tower 4 is arranged close to the heater 5. The heating medium in the heater 5 can exchange heat with the raw material entering the distillation tower 4 to achieve heating of the raw material entering the distillation tower 4. The condensing medium in the condenser 6 can exchange heat with the heated raw material in the distillation tower 4. The heated raw material rises from the bottom of the distillation tower 4 to the top of the distillation tower 4 and exchanges heat with the condensing medium. The cooled gas raw material is transported to the collection unit from the top gas phase outlet of the distillation tower 4.

[0043] In this specific embodiment, the heating medium and the condensing medium are both dimethyl silicone oil. The hot dimethyl silicone oil enters the heater 5 from H-1 and flows out through H-2; the cold dimethyl silicone oil enters the condenser 6 from C-1 and flows out through C-2. In other specific embodiments of the utility model, the heating medium and the condensing medium can select different cooling agents or heat carriers according to specific circumstances.

[0044] More specifically, the collection unit further includes a weighing mechanism 9, which is disposed at the bottom of the cold trap tank 7. The weighing mechanism 9 is used to monitor the quality of the cold trap tank 7 and the collection bottle 8. The gaseous raw material after cooling enters the collection bottle 8 in the cold trap tank 7 for low-temperature collection. The weighing mechanism 9 is disposed at the bottom of the cold trap tank 7. The weighing mechanism 9 is used to monitor the data changes to determine the raw material collection situation. In addition, the collection bottle 8 is also connected to a venting pipeline, which is connected to the external environment. A venting valve is disposed on the venting pipeline, and the non-condensable gas in the collection bottle 8 can be removed by using the venting valve and the venting pipeline.

[0045] It should be emphasized that each connecting pipeline 10 is provided with a control valve to control the connectivity status of each unit and improve the controllability of the system.

[0046] The dimethyl ether purification system of the utility model also includes a purge pipeline 12, on which a vacuum pump 11 and a protective gas source are arranged, the purge pipeline 12 can be connected to the connecting pipeline 10, and the protective gas can be transported into the connecting pipeline 10, and the system can be purged and replaced by the vacuum pump 11 and liquid nitrogen gasification; the adsorption unit and the connecting pipeline 10 are purged and replaced by the crude dimethyl ether raw material and the vacuum pump 11, and the impurities in contact with the air during the connection operation of the connecting pipeline 10 are eliminated; the collection unit and the connecting pipeline 10 are purged and replaced by the dimethyl ether product and the vacuum pump 11, and the impurities in contact with the air during the operation of the connecting pipeline 10 are eliminated, so as to further enhance the purification effect of the system.

[0047] It should also be noted that, in actual applications, when the purification requirements are high, the collection unit can be connected to the raw material tank 1 so that the raw material can undergo multiple purification processes to further enhance the purification effect.

[0048] In the dimethyl ether purification system of the utility model, the adsorption unit is provided with multiple groups of adsorbers 2 connected in series, and the adsorbers 2 are filled with molecular sieves of different specifications to remove water, methane and carbon oxides in dimethyl ether. The distillation unit is used to remove light components, and the distillation tower 4 is a packing tower. A filter 3 is installed between the inlet of the distillation tower 4 and the last-stage adsorber 2 to prevent particulate matter from passing through. The collection unit includes a cold trap tank 7 and a collection bottle 8, which are used for pipeline replacement and low-temperature collection. The dimethyl ether purification system of the utility model can be carried out in steps, and each unit can be adjusted and flexibly matched, such as adsorption + distillation, adsorption + cold trap collection or distillation + cold trap collection. The purity of dimethyl ether can reach 99.999%, the purification effect is stable and efficient, and the system has high adaptability.

[0049] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A dimethyl ether purification system, characterized in that: include: An adsorption unit, the adsorption unit is connected to the dimethyl ether raw material, and the adsorption unit includes at least two groups of adsorbers arranged in series to adsorb impurities in the raw material; A distillation unit, the distillation unit comprising a distillation tower, a heater and a condenser, the outlet of the adsorber is connected to the inlet of the distillation tower, the heater can heat the raw materials entering the distillation tower, and the condenser cools and condenses the heated raw materials to remove light component impurities in the raw materials; A collecting unit, the collecting unit comprising a cold trap tank and a collecting bottle arranged in the cold trap tank, the collecting bottle being connected to the gas phase outlet of the distillation tower; The adsorption unit, the distillation unit and the collection unit are all connected by a connecting pipeline, and the adsorption unit, the distillation unit and the collection unit are all detachably connected to the connecting pipeline.

2. The dimethyl ether purification system according to claim 1, characterized in that: The adsorber is filled with an adsorbent or a metal catalyst.

3. The dimethyl ether purification system according to claim 2, characterized in that: When the adsorbent is activated carbon, the adsorbent is coconut shell charcoal, resin-based charcoal, wood charcoal or commercial charcoal; When the adsorbent is a molecular sieve, the adsorbent is a 3A molecular sieve, a 5A molecular sieve or a 13X molecular sieve; The adsorbent is in the form of spheres, rings, cubes or special-shaped particles.

4. The dimethyl ether purification system according to claim 1, characterized in that: A filter is arranged between the adsorption unit and the distillation unit; when there are multiple groups of filters, all the filters are arranged in series.

5. The dimethyl ether purification system according to claim 1, characterized in that: The filler in the distillation tower is one or more of the following: Raschig rings, Pall rings, step rings, and saddle rings.

6. The dimethyl ether purification system according to claim 1, characterized in that: The heater is located at the bottom of the distillation tower, the condenser is arranged at the top of the distillation tower, and the connection between the adsorption unit and the distillation tower is arranged close to the heater. The heating medium in the heater can exchange heat with the raw materials entering the distillation tower to heat the raw materials entering the distillation tower, and the condensing medium in the condenser can exchange heat with the heated raw materials in the distillation tower.

7. The dimethyl ether purification system according to claim 6, characterized in that: The heating medium and the condensing medium are both dimethyl silicone oil.

8. The dimethyl ether purification system according to claim 1, characterized in that: The collection unit also includes a weighing mechanism, which is arranged at the bottom of the cold trap tank and is used to monitor the quality of the cold trap tank and the collection bottle; the collection bottle is also connected to a venting pipeline, which is connected to the external environment and is provided with a venting valve.

9. The dimethyl ether purification system according to any one of claims 1 to 8, characterized in that: Each of the connecting pipelines is provided with a control valve; It also includes a purge pipeline, on which a vacuum pump and a protective gas source are arranged. The purge pipeline can be connected to the connecting pipeline and transport the protective gas into the connecting pipeline.

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