Methanol dealkylation system

Abstract

The utility model discloses a methanol dealkylation system, and relates to the technical field of methanol purification equipment, the methanol dealkylation system comprises a feeding system, an adsorption dealkylation system and a filtering system, the feeding system is used for being communicated with a raw material tank and inputting raw materials into the methanol dealkylation system; a feeding hole of the adsorption and dealkylation system is communicated with the feeding system and is used for carrying out adsorption and dealkylation on raw materials; and the filtering system is communicated with a discharge hole of the adsorption dealkylation system and is used for filtering and dealkylation of the materials subjected to adsorption dealkylation. According to the system provided by the utility model, methanol is separated and purified through adsorption and filtration, the energy consumption and the treatment cost are lower than the transportation cost of 300 yuan / ton increased by adopting a special transport vehicle, the removal depth is far better than that of the prior art such as rectification, extraction and the like, and the energy consumption is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of methanol purification equipment, in particular to a methanol dehydrocarbonization system. Background Art

[0002] In the field of chemical production, in some cases, methanol may contain liquid hydrocarbon impurities. For example, many chemical raw material transport vehicles transport liquid hydrocarbons such as alkanes, alkenes, and aromatics to a destination, and then transport methanol on the way back to reduce the cost of running empty on the return trip. Since the tank cannot be completely cleaned, this results in methanol being contaminated with trace amounts of liquid hydrocarbons. These trace hydrocarbon impurities in methanol can have an adverse impact on equipment, catalysts or adsorbents, and product purity in application scenarios with relatively high requirements for methanol purity, such as rapid deactivation of catalysts or adsorbents, coking and blockage of equipment, and non-compliance of product quality.

[0003] Because methanol is an excellent solvent for these liquid hydrocarbons and its properties such as boiling point and freezing point are close, it is very difficult to remove them by methods such as distillation or extraction; moreover, because the impurity content is relatively low, methods such as distillation or extraction also have relatively high energy consumption and are uneconomical. If methanol is transported by a dedicated vehicle, there must be an empty run, and since the price of methanol itself is not high, the transportation cost per ton will increase by about 300 yuan, which is difficult for many users with large methanol consumption to bear. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a methanol dehydrocarbonization system to solve the problems existing in the above-mentioned prior art and purify methanol efficiently at low cost.

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

[0006] The utility model provides a methanol dehydrocarbonization system, including:

[0007] A feed system for communicating with a raw material tank and inputting raw materials into the methanol dehydrocarbonization system;

[0008] An adsorption dehydrocarbonization system, the feed port of which is communicated with the feed system, for performing adsorption dehydrocarbonization on raw materials;

[0009] A filtration system; the filtration system is communicated with the discharge port of the adsorption dehydrocarbonization system for filtering and dehydrocarbonizing the material after adsorption dehydrocarbonization.

[0010] Preferably, the adsorption dehydrocarbonization system includes a plurality of adsorption tanks connected in parallel; the filtration system includes a plurality of filtration tanks connected in parallel; some of the adsorption tanks and some of the filtration tanks are standby tanks. When the adsorption tanks and / or the filtration tanks in the use state are penetrated by impurities, the pipeline of the feed system is switched to be communicated with the standby tanks.

[0011] Preferably, a regeneration system is further included. The regeneration system includes a gas source and an intake system connected to the gas source. The intake system is connected to the discharge ports of the filtration tank and the adsorption tank to blow air reversely towards the filtration tank and the adsorption tank to achieve regeneration.

[0012] Preferably, a material discharging system is further included. A discharging buffer system is further connected to the feed ports of the filtration tank and the adsorption tank. The discharging buffer system is used to discharge the raw materials in the adsorption tank and the filtration tank penetrated by impurities.

[0013] Preferably, an adsorbent is installed in the adsorption tank. The adsorbent is one or more of molecular sieve, alumina, activated carbon, silica gel and MOF; the loading method of the adsorbent is fixed-bed stacking, or fluidized-bed, fluidized-bed and suspension-bed bulk loading.

[0014] Preferably, the gas source includes a steam source and a nitrogen source, and both the steam source and the nitrogen source are connected to the intake system.

[0015] Preferably, the intake system includes a heater, and the heater is arranged on the pipeline where the gas source is connected to the filtration tank and the adsorption tank.

[0016] The present utility model further provides a method for methanol dehydrocarbonation, including:

[0017] The raw materials of the feeding system are input into the adsorption dehydrocarbonation system. After the raw materials are subjected to adsorption dehydrocarbonation by the adsorption dehydrocarbonation system and filtration dehydrocarbonation by the filtration system, the purified methanol is discharged.

[0018] Preferably, when the adsorption tank in the adsorption dehydrocarbonation system and the filtration tank in the filtration system are penetrated by impurities, the pipeline of the feeding system is switched to be connected to the standby tank.

[0019] Preferably, after switching to use the standby tank for dehydrocarbonation, the raw materials in the adsorption tank and the filtration tank penetrated by impurities are discharged through the discharging buffer system, and then the regeneration system is used to regenerate the adsorption tank and the filtration tank penetrated by impurities.

[0020] The present utility model has achieved the following technical effects compared with the prior art:

[0021] The system provided by the present utility model purifies methanol through adsorption and filtration separation. The energy consumption and treatment cost are lower than the transportation cost of 300 yuan / ton increased by using a special transport vehicle, and the removal depth is much better than the existing technologies such as rectification and extraction, and the energy consumption is greatly reduced. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the methanol dehydrocarbon system provided by the embodiment of the present invention;

[0024] In the figure: 1 - adsorption dehydrocarbon system; 2 - adsorption tank; 3 - filtration tank; 4 - heater; 5 - buffer tank; 6 - filtration system. Specific embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0027] The embodiment of the present invention provides a methanol dehydrocarbon system, as Figure 1 shown, including: a feed system, an adsorption dehydrocarbon system 1, and a filtration system 6; the feed system is used to communicate with the raw material tank and input the raw material into the methanol dehydrocarbon system; the feed port of the adsorption dehydrocarbon system 1 is communicated with the feed system, and is used to perform adsorption dehydrocarbon on the raw material; the filtration system 6 is communicated with the discharge port of the adsorption dehydrocarbon system 1, and is used to perform filtration dehydrocarbon on the material after adsorption dehydrocarbon.

[0028] The adsorption dehydrocarbon system 1 and the filtration system 6 in this embodiment can achieve the purpose of purifying methanol.

[0029] The methanol dehydrocarbon system provided by this embodiment purifies methanol through adsorption and filtration separation, with energy consumption and processing costs lower than the transportation cost of 300 yuan / ton increased by using a dedicated transport vehicle, and the removal depth is much better than existing technologies such as rectification and extraction, and the energy consumption is greatly reduced.

[0030] In some embodiments, the adsorption and hydrocarbon removal system 1 includes a plurality of adsorption tanks 2 connected in parallel; the filtration system 6 includes a plurality of filtration tanks 3 connected in parallel; some of the adsorption tanks 2 and some of the filtration tanks 3 are standby tanks. When the adsorption tanks 2 and / or filtration tanks 3 in the operating state are penetrated by impurities, the pipeline of the feeding system is switched to be connected to the standby tanks immediately.

[0031] When implementing this embodiment, some of the adsorption tanks 2 and filtration tanks 3 are used to purify methanol, and the other part is for standby; when the adsorption tanks 2 in the adsorption and hydrocarbon removal system 1 and / or the filtration tanks 3 in the filtration system 6 are penetrated by impurities, the pipeline of the feeding system is switched to be connected to the standby tanks immediately, and the standby tanks are enabled to purify methanol, and then the adsorption tanks 2 and / or filtration tanks 3 penetrated by impurities are regenerated. This process does not require shutting down the equipment to avoid affecting the production progress.

[0032] When only two adsorption tanks 2 and two filtration tanks 3 are provided, one starts and the other stops. When the adsorption tanks 2 and filtration tanks 3 are regenerated, it should be ensured that the total duration of the regeneration process is less than the penetration duration of the other adsorption tank 2 or filtration tank 3 to ensure the continuity of the entire feeding process.

[0033] Among them, the adsorption tank 2 is filled with an adsorbent, and the adsorbent can be a porous material such as molecular sieve, alumina, activated carbon, silica gel, MOF, etc. and their combinations. The filling method can be fixed-bed stacking, or fluidized bed, fluidized bed, suspended-bed bulk filling, and fixed-bed stacking is preferred. After the raw material is processed by the adsorption and hydrocarbon removal system 1, it comes to the filtration tank 3, and after further removing hydrocarbon impurities, it enters the downstream production device or storage tank.

[0034] In order to realize the regeneration of the adsorption tank 2 and the filtration tank 3, in some embodiments, the embodiment of the present invention further includes a regeneration system. The regeneration system includes a gas source and an intake system connected to the gas source. The intake system is connected to the discharge ports of the filtration tank 3 and the adsorption tank 2 to blow air reversely into the filtration tank 3 and the adsorption tank 2 to realize regeneration.

[0035] In this embodiment, hot inert gas such as hot air is blown into the adsorption tank 2 and the filtration tank 3 as the regeneration gas to deeply remove the impurities adsorbed by the adsorbent to realize the regeneration of the adsorbent.

[0036] In order to avoid waste, in some embodiments, the embodiment of the present invention further includes a pouring system. The feeding ports of the filtration tank 3 and the adsorption tank 2 are also connected with a pouring buffer system, and the pouring buffer system is used to export the raw materials in the adsorption tank 2 and the filtration tank 3 penetrated by impurities.

[0037] This embodiment uses the pouring system to export the raw materials in the adsorption tank 2 and the filtration tank 3 to avoid affecting the regeneration of the adsorbent and the filtration tank 3, and saves raw materials.

[0038] In some embodiments, the gas source includes a steam source and a nitrogen source, and both the steam source and the nitrogen source are connected to the intake system.

[0039] In this embodiment, the filter tank 3 and the adsorption tank 2 can be regenerated separately using steam or nitrogen, or they can be sent together to the filter tank 3 and the adsorption tank 2 for regeneration. To achieve this process, the pipelines of the intake system and the valves on the pipelines need to be designed accordingly, as Figure 1 shown.

[0040] To further save raw materials, during the pouring process, after emptying the raw materials in the filter tank 3 and the adsorption tank 2, normal temperature nitrogen or cold nitrogen is used to purge the filter tank 3 and the adsorption tank 2, and the raw materials are carried and discharged together into the buffer tank 5 or the raw material tank.

[0041] In some embodiments, the intake system includes a heater 4, and a heater 4 is provided on the pipeline where the gas source is connected to the filter tank 3 and the adsorption tank 2.

[0042] Specifically, the nitrogen source can be connected to the filter tank 3 and the adsorption tank 2 through three pipelines.

[0043] The first pipeline is connected to the outlets at the tops of the filter tank 3 and the adsorption tank 2, and a heater 4 is provided thereon for implementing the regeneration process.

[0044] The second pipeline is connected to the outlets at the tops of the filter tank 3 and the adsorption tank 2, and no heater 4 is provided thereon for purging the raw materials.

[0045] The third pipeline is connected to the inlets at the bottoms of the filter tank 3 and the adsorption tank 2, and no heater 4 is provided thereon for purging the tanks after regeneration and before use.

[0046] The steam source can be connected to the filter tank 3 and the adsorption tank 2 through two pipelines.

[0047] The first pipeline is connected to the outlets at the tops of the filter tank 3 and the adsorption tank 2, and a heater 4 is provided thereon for implementing the regeneration process.

[0048] The second pipeline is connected to the outlets at the tops of the filter tank 3 and the adsorption tank 2, and no heater 4 is provided thereon.

[0049] When regenerating the filter tank 3 and the adsorption tank 2, the heater 4 is used to heat the nitrogen, and the hot nitrogen is used to achieve regeneration. When the temperature of the steam does not reach the set temperature, the heater 4 is used to heat the steam. When the steam temperature is higher than the set temperature, it is directly discharged into the filter tank 3 and the adsorption tank 2 without passing through the heater 4 for regeneration.

[0050] The typical inlet temperature of the regeneration gas is 170 - 270 °C, and the hourly gas intake is 100 - 1000 times the volume of the adsorbent filling.

[0051] In some embodiments, when regenerating the filtration tank 3 and the adsorption tank 2, impurities and gas can be discharged by setting a waste outlet at the bottom of the filtration tank 3 and the adsorption tank 2, or the impurities and gas in the filtration tank 3 and the adsorption tank 2 can be discharged to the buffer tank 5 and then discharged to other storage systems or the outside. When using this method, the raw materials in the buffer tank 5 need to be discharged to the raw material tank in advance.

[0052] The embodiment of the present utility model also provides a method for methanol dehydrocarbonation, including:

[0053] The raw materials of the feeding system are input into the adsorption dehydrocarbonation system 1. After the raw materials are subjected to adsorption dehydrocarbonation in the adsorption dehydrocarbonation system 1 and filtration dehydrocarbonation in the filtration system 6, purified methanol is discharged.

[0054] When the adsorption tank 2 in the adsorption dehydrocarbonation system 1 and the filtration tank 3 in the filtration system 6 are penetrated by impurities, the pipeline of the feeding system is switched to be connected to the standby tank.

[0055] After switching to use the standby tank for dehydrocarbonation, the raw materials in the adsorption tank 2 and the filtration tank 3 penetrated by impurities are exported through the pouring buffer system, and then the adsorption tank 2 and the filtration tank 3 penetrated by impurities are regenerated by using the regeneration system.

[0056] The method for methanol dehydrocarbonation provided by the embodiment of the present utility model is carried out by using the above methanol dehydrocarbonation system. Therefore, it has all the advantages of the above methanol dehydrocarbonation system embodiment and will not be elaborated here.

[0057] Specific examples are applied in the present utility model to elaborate the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method of the present utility model and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A methanol dehydrocarbonization system, characterized in that: Comprising: A feeding system, which is used to communicate with a raw material tank and input raw materials into the methanol dehydrocarbon system; An adsorption dehydrocarbon system, the feed inlet of which is communicated with the feeding system and is used for performing adsorption dehydrocarbon on raw materials; A filtering system; the filtering system is communicated with the discharge outlet of the adsorption dehydrocarbon system and is used for filtering and dehydrocarbonizing the material after adsorption dehydrocarbon.

2. The methanol dehydrocarbonization system according to claim 1, wherein: The adsorption dehydrocarbon system includes a plurality of parallel adsorption tanks; the filtering system includes a plurality of parallel filtering tanks; some of the adsorption tanks and some of the filtering tanks are standby tanks. When the adsorption tanks and / or the filtering tanks in the use state are penetrated by impurities, the pipeline of the feeding system is switched to be communicated with the standby tanks.

3. The methanol dehydrocarbonization system according to claim 2, characterized in that: It further includes a regeneration system, the regeneration system includes a gas source and an air inlet system connected to the gas source, and the air inlet system is communicated with the discharge outlets of the filtering tank and the adsorption tank to blow air reversely towards the filtering tank and the adsorption tank to realize regeneration.

4. The methanol dehydrocarbonization system according to claim 2, characterized in that: It further includes a material discharging system, and a discharging buffer system is also communicated with the feed inlets of the filtering tank and the adsorption tank, and the discharging buffer system is used for discharging the raw materials in the adsorption tank and the filtering tank penetrated by impurities.

5. The methanol dehydrocarbonization system according to claim 3, wherein: The gas source includes a steam source and a nitrogen source, and both the steam source and the nitrogen source are communicated with the air inlet system.

6. The methanol dehydrocarbonization system according to claim 3, characterized in that: The air inlet system includes a heater, and the heater is arranged on the pipeline where the gas source is communicated with the filtering tank and the adsorption tank.

Images