CN219209067U - External phase splitting device of MMA refining procedure dehydration tower - Google Patents
External phase splitting device of MMA refining procedure dehydration tower Download PDFInfo
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- CN219209067U CN219209067U CN202320081295.4U CN202320081295U CN219209067U CN 219209067 U CN219209067 U CN 219209067U CN 202320081295 U CN202320081295 U CN 202320081295U CN 219209067 U CN219209067 U CN 219209067U
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Abstract
The utility model discloses an external phase separation device of a dehydration tower in an MMA refining process, which comprises an MMA dehydration tower (1), an MMA dehydration tower phase separator (2) and a phase separator water phase pump (3); a feed inlet is formed on the MMA dehydration tower phase separator, the feed inlet of the MMA dehydration tower phase separator is connected with the middle part of the MMA dehydration tower through one pipeline, and the feed inlet of the MMA dehydration tower phase separator is externally connected with a desalted water supply device through the other pipeline; a lower discharge hole is formed at the bottom of the MMA dehydration tower phase separator, a feed inlet of the phase separator water phase pump is connected with the lower discharge hole of the MMA dehydration tower phase separator, and the discharge hole of the phase separator water phase pump is externally connected to an MMA extraction procedure; an upper discharge hole is formed at the top of the MMA dehydration tower phase separator, and the upper discharge hole of the MMA dehydration tower phase separator is connected with the middle part of the MMA dehydration tower through a pipeline. The utility model can solve the problem of lower dehydration rate of crude MMA feed liquid in the dehydration tower in the prior art.
Description
Technical Field
The utility model relates to MMA (methyl methacrylate, namely methyl methacrylate) refining process equipment, in particular to an external phase separation device of a dehydration tower in an MMA refining process.
Background
Methyl Methacrylate (MMA) is the main raw material for producing organic glass plates, PMMA molding materials and high-grade coatings; the adhesive is widely applied to the fields of military industry, optical fibers, bathroom, high-grade adhesives, high-grade paint, PVC modifier ACR, sea halls, outdoor billboards, light guide materials of displays, and the like.
There are many processes for producing Methyl Methacrylate (MMA), and there are mainly acetone cyanohydrin method (ACH method), isobutylene oxidation method, ethylene method and the like. Among them, the acetone cyanohydrin method is the earliest method for industrially producing MMA, and because of the mature technology and the capability of utilizing acrylonitrile to produce byproduct hydrocyanic acid, the MMA produced by the acetone cyanohydrin method at present accounts for about 80% of the total yield. The process can effectively utilize the byproduct hydrocyanic acid of the acrylonitrile device, and the yield of MMA is higher, which is an important technical advantage.
In the process of Acetone Cyanohydrin (ACH), in the acylation reaction stage, ACH and sulfuric acid are added into the reaction according to a certain proportion to generate an amide salt intermediate, then the amide salt intermediate is sent to the working section of esterification and the like to continuously react to generate Methyl Methacrylate (MMA), the crude MMA feed liquid is firstly subjected to an extraction procedure and then is sent to a refining procedure, and the MMA product is obtained through four steps of a dehydration tower, an MMA finished product tower, an MMA recovery tower and an MMA refining tail gas absorption tower. In the MMA refining device in the prior art, an external phase separator is not arranged in the dehydration tower, and as the crude MMA feed liquid from the extraction process mainly contains MMA:91.1% (w), methanol: 3.42% (w), acetone: 1.71% (w), water: 2.11% (w). Methanol boiling point 64.7 ℃; the boiling point of the acetone is 56.53 ℃; whereas water has a boiling point of 100℃and MMA has a boiling point of 100 to 101℃which are very close to each other. At this time, the top of the dehydration tower can produce enriched methanol and acetone, the boiling points of water and MMA are close to each other, the water and MMA are basically enriched in the produced liquid of the tower kettle, most of the water is taken away by MMA, water is difficult to separate, the crude MMA can be concentrated to 94% at the highest, and the dehydration rate of the crude MMA feed liquid still needs to be further improved.
Therefore, it is necessary to provide an external phase separation device of a dehydration tower in an MMA refining process, which can solve the problem of low dehydration rate of crude MMA feed liquid in the dehydration tower in the prior art.
Disclosure of Invention
The utility model aims to provide an external phase separation device of a dehydration tower in an MMA refining process, which can solve the problem of low dehydration rate of crude MMA feed liquid in the dehydration tower in the prior art.
The utility model is realized in the following way:
an external phase separation device of a dehydration tower in an MMA refining process comprises an MMA dehydration tower, an MMA dehydration tower phase separator and a phase separator water phase pump; a feed inlet is formed on the MMA dehydration tower phase separator, and the feed inlet of the MMA dehydration tower phase separator is connected with the middle part of the MMA dehydration tower through one pipeline, and is externally connected with a desalted water supply device through the other pipeline; a lower discharge hole is formed at the bottom of the MMA dehydration tower phase separator, a feed inlet of the phase separator water phase pump is connected with the lower discharge hole of the MMA dehydration tower phase separator, and the discharge hole of the phase separator water phase pump is externally connected to an MMA extraction procedure; an upper discharge port is formed at the top of the MMA dehydration tower phase separator, and the upper discharge port of the MMA dehydration tower phase separator is connected with the middle part of the MMA dehydration tower through a pipeline.
The position of a tower plate, which is connected with the MMA dehydration tower, of a discharge port at the upper layer of the MMA dehydration tower phase separator is lower than that of a tower plate, which is connected with the MMA dehydration tower, of a feed port of the MMA dehydration tower phase separator.
21 trays are arranged in the MMA dehydration tower from top to bottom at intervals, a feed inlet of the MMA dehydration tower phase separator is connected to a 10 th tray of the MMA dehydration tower, and a discharge outlet of the upper layer of the MMA dehydration tower phase separator is connected to a 11 th tray of the MMA dehydration tower.
The feed inlet of the MMA dehydration tower phase separator is positioned at the top of the MMA dehydration tower phase separator and extends downwards to the bottom of the MMA dehydration tower phase separator, so that crude MMA feed liquid and desalted water enter the bottom of the MMA dehydration tower phase separator through the feed inlet.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the utility model, as the MMA dehydration tower phase separator is arranged, crude MMA feed liquid in the middle of the MMA dehydration tower is pumped out to the MMA dehydration tower phase separator through the feed inlet, and desalted water is added through the feed inlet, so that MMA is promoted to move towards an organic phase, a heterogeneous area is gradually increased, thereby separating MMA from water, and then the upper-layer MMA-rich oil phase is returned to the MMA dehydration tower for continuous concentration, so that the concentration of MMA in the tower bottom of the dehydration tower can be finally increased to 99.7%, and the dehydration rate of the crude MMA feed liquid is greatly improved.
2. The utility model can recycle the water at the lower layer of the MMA dehydration tower phase separator to the extraction process for use due to the water phase pump of the phase separator, thereby ensuring the circulation and continuous operation of the MMA refining process.
Drawings
FIG. 1 is a front view of an external phase separation device of a dehydration column in an MMA refining process of the present utility model;
FIG. 2 is a graph of the mass fraction of MMA on trays 1 to 21 of the MMA dehydration column (without a phase separator);
FIG. 3 is a graph of the mass fraction of water on trays 1-21 of the MMA dehydration column (without a phase separator);
FIG. 4 is a graph of the mass fraction of methanol on trays 1 to 21 of the MMA dehydration column (without a phase separator);
FIG. 5 is a graph of the mass fraction of acetone on trays 1-21 of the MMA dehydration column (without a phase separator).
In the figure, a 1MMA dehydration tower, a 2MMA dehydration tower phase separator, a 3 phase separator water phase pump, a 4 dehydration tower condenser, a 5 dehydration tower tail gas condenser, a 6 dehydration tower reflux tank, a 7 dehydration tower reflux pump, a 8 dehydration tower aftercooler, a 9 low-boiling-point substance tank and a 10 low-boiling-point substance pump.
Detailed Description
The utility model will be further described with reference to the drawings and the specific examples.
Referring to fig. 1, an external phase separation device of a dehydration tower in an MMA refining process comprises an MMA dehydration tower 1, an MMA dehydration tower phase separator 2 and a phase separator water phase pump 3; a feed inlet is formed on the MMA dehydrating tower phase separator 2, the feed inlet of the MMA dehydrating tower phase separator 2 is connected with the middle part of the MMA dehydrating tower 1 through one pipeline, and the feed inlet of the MMA dehydrating tower phase separator 2 is externally connected with a desalted water supply device through the other pipeline; a lower discharge hole is formed at the bottom of the MMA dehydration tower phase separator 2, a feed hole of the phase separator water phase pump 3 is connected with the lower discharge hole of the MMA dehydration tower phase separator 2, and the discharge hole of the phase separator water phase pump 3 is externally connected to an MMA extraction procedure; an upper discharge port is formed at the top of the MMA dehydration tower phase separator 2, and the upper discharge port of the MMA dehydration tower phase separator 2 is connected with the middle part of the MMA dehydration tower 1 through a pipeline.
Because water and MMA are mostly enriched in the middle part of the MMA dehydration tower 1, crude MMA feed liquid is pumped from the middle part of the MMA dehydration tower 1 and is sent into the MMA dehydration tower phase separator 2 through a feed inlet, and desalted water is added into the feed inlet of the MMA dehydration tower phase separator 2, so that MMA moves towards an organic phase, separation of MMA and water is realized, and the optimal dehydration effect is achieved. The upper MMA feed liquid of the MMA dehydration tower phase separator 2 returns to the MMA dehydration tower 1 through an upper discharge port to be continuously concentrated, and the lower reclaimed water of the MMA dehydration tower phase separator 2 is sent to an MMA extraction process through a lower discharge port to be used.
The MMA dehydration column phase separator 2 can be used for the stratified separation of MMA and moisture by using 1209-V-13117 phase separator of the prior art.
The position of a column plate, which is connected with the MMA dehydration column 1, of a discharge port at the upper layer of the MMA dehydration column phase separator 2 is lower than that of a column plate, which is connected with the MMA dehydration column 1, of a feed port of the MMA dehydration column phase separator 2, so that the crude MMA feed liquid is ensured to be returned to the MMA dehydration column 1 for continuous concentration after being effectively dehydrated by the MMA dehydration column phase separator 2.
Preferably, 21 trays are arranged in the MMA dehydration tower 1 from top to bottom at intervals, a feed inlet of the MMA dehydration tower phase separator 2 is connected to a 10 th tray of the MMA dehydration tower 1, and a discharge outlet of the upper layer of the MMA dehydration tower phase separator 2 is connected to an 11 th tray of the MMA dehydration tower 1.
In MMA dehydration column 1The MMA-and water-rich liquid phase withdrawn from the 10 th tray of (C) was fed into MMA-dehydration column phase separator 2 at a MMA density of 0.944g/cm 3 The solubility in water is 1.59 parts MMA per 100 parts water at 25 ℃, so that MMA and water can be separated in a MMA dehydration column phase separator 2 in a layered manner, and MMA is the upper layer and can be returned to the 11 th column plate of the MMA dehydration column 1 through an upper layer discharge hole; the lower layer is a water layer, and can be sent to an extraction process for use through a phase separator water phase pump 3.
The connection position of the feed inlet of the MMA dehydrating tower phase separator 2 and the upper layer discharge outlet of the MMA dehydrating tower phase separator 2 can be adaptively adjusted according to the number of the tower plates contained in the MMA dehydrating tower 1.
The feed inlet of the MMA dewatering tower phase separator 2 is positioned at the top of the MMA dewatering tower phase separator 2 and extends downwards to the bottom of the MMA dewatering tower phase separator 2, so that crude MMA feed liquid and desalted water enter the bottom of the MMA dewatering tower phase separator 2 through the feed inlet, and phase separation of the desalted water and the crude MMA feed liquid in the MMA dewatering tower phase separator 2 is ensured.
The working principle of the utility model is as follows:
the crude MMA feed liquid mainly contains MMA:91.1% (w), methanol: 3.42% (w), acetone: 1.71% (w), water: 2.11% (w). The water content of the mixed solution is relatively low, the proportion of water is increased, so that extraction of MMA is facilitated, the structural difference between MMA and water molecules is large, carbonyl groups on MMA are difficult to form hydrogen bonds with the water molecules, so that the mutual solubility is low, MMA can be promoted to move to an organic phase by increasing the water content, namely desalted water, so that a heterogeneous area is gradually increased, and the delamination separation of MMA and water in the MMA dehydration tower phase separator 2 is facilitated.
Example 1:
referring to fig. 1, taking a certain project as an example, crude MMA feed liquid from the extraction process enters an MMA dehydration tower 1, 21 trays are sequentially arranged in the MMA dehydration tower 1 from top to bottom, and the 7 th tray is fed. According to the simulation calculation of the components of the crude MMA feed liquid on the 7 th tower plate, the mass fractions of MMA, water, methanol and acetone on the 1 st to 21 st tower plates of the MMA dehydration tower 1 are respectively shown in the accompanying figures 2 to 5.
The vapor which is rich in low-boiling substances such as methanol, acetone, ethanol and the like and part of MMA at the top of the tower passes through a dehydration tower condenser 4, the condensate enters a dehydration tower reflux tank 6, then passes through a dehydration tower reflux pump 7, one part of the vapor is pumped back to the top of the MMA dehydration tower 1, and the other part of vapor is sent to an extraction process or a polymerization inhibitor solution is prepared; the uncondensed gas enters a dehydration tower tail gas condenser 5, is cooled by cold brine at the temperature of minus 10 ℃, and the condensate enters a dehydration tower reflux tank 6; the uncondensed gas enters a rear cooler 8 of the dehydrating tower and is cooled by cold brine at the temperature of minus 10 ℃, condensate enters a low-boiling-point substance tank 9 again, the low-boiling-point substance is sent to the SAR incinerator for treatment by a low-boiling-point substance pump 10, and the noncondensable gas of the rear cooler 8 of the dehydrating tower is connected to a vacuum pump system to maintain the negative pressure operation of the dehydrating tower.
Since both water and MMA are enriched in the middle of the column to the column bottom and MMA is slightly soluble in water, a crude MMA feed liquid is extracted from the 10 th column plate of the MMA dehydration column 1 and enters the MMA dehydration column phase separator 2 through a feed port, and the components of the crude MMA feed liquid are as follows: MMA was 15446kg/h, methanol was 580kg/h, acetone was 291kg/h, water was 358kg/h, and other minor impurities. Meanwhile, 1500kg/h of desalted water is added through a feed inlet of the MMA dehydrating tower phase separator 2, water is well separated from the crude MMA feed liquid in the MMA dehydrating tower phase separator 2 through the increase of water quantity, the total water entering the MMA dehydrating tower phase separator 2 is 1858kg/h, the separated water is 1855kg/h, and the separation rate of the water is high.
The water phase at the lower layer of the MMA dehydration column phase separator 2 is sent to an extraction process for use through a lower layer discharge port by a phase separator water phase pump 3; the upper layer of MMA-rich oil phase returns to the 11 th column plate of the MMA dehydration column 1 through the upper layer discharge port of the MMA dehydration column phase separator 2 to continue refining and concentrating.
The water in the crude MMA feed liquid is separated and removed in the middle of the MMA dehydration tower 1 through the MMA dehydration tower phase separator 2 arranged outside the middle of the MMA dehydration tower 1, so that a solution rich in methanol and acetone is separated from the top of the MMA dehydration tower 1, and the final concentration of the crude MMA feed liquid obtained by concentrating at the tower bottom can reach 99.7% (w), compared with 94% of the concentration of the crude MMA feed liquid in the prior art, the dehydration rate of the crude MMA feed liquid in the MMA dehydration tower 1 is greatly improved, and the concentration effect is good.
The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model should be included in the scope of the present utility model.
Claims (4)
1. An external phase separation device of a dehydration tower in an MMA refining process is characterized in that: comprises an MMA dehydration tower (1), an MMA dehydration tower phase separator (2) and a phase separator water phase pump (3); a feed inlet is formed on the MMA dehydrating tower phase separator (2), the feed inlet of the MMA dehydrating tower phase separator (2) is connected with the middle part of the MMA dehydrating tower (1) through one pipeline, and the feed inlet of the MMA dehydrating tower phase separator (2) is externally connected with a desalted water supply device through the other pipeline; a lower discharge hole is formed at the bottom of the MMA dehydration tower phase separator (2), a feed hole of the phase separator water phase pump (3) is connected with the lower discharge hole of the MMA dehydration tower phase separator (2), and the discharge hole of the phase separator water phase pump (3) is externally connected to an MMA extraction procedure; an upper discharge hole is formed at the top of the MMA dehydration tower phase separator (2), and the upper discharge hole of the MMA dehydration tower phase separator (2) is connected with the middle part of the MMA dehydration tower (1) through a pipeline.
2. The external phase separation device for a dehydration column in an MMA refining process according to claim 1, wherein: the position of a tower plate, which is connected with the MMA dehydration tower (1), of a discharge port at the upper layer of the MMA dehydration tower phase separator (2) is lower than that of a tower plate, which is connected with the MMA dehydration tower (1) of a feed port of the MMA dehydration tower phase separator (2).
3. The external phase separation device for a dehydration column in an MMA refining process according to claim 2, wherein: 21 trays are arranged in the MMA dehydration tower (1) from top to bottom at intervals, a feed inlet of the MMA dehydration tower phase separator (2) is connected to a 10 th tray of the MMA dehydration tower (1), and a discharge outlet at the upper layer of the MMA dehydration tower phase separator (2) is connected to an 11 th tray of the MMA dehydration tower (1).
4. The external phase separation device for a dehydration column in an MMA refining process according to claim 1, wherein: the feed inlet of the MMA dehydrating tower phase separator (2) is positioned at the top of the MMA dehydrating tower phase separator (2) and extends downwards to the bottom of the MMA dehydrating tower phase separator (2), so that crude MMA feed liquid and desalted water enter the bottom of the MMA dehydrating tower phase separator (2) through the feed inlet.
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| CN202320081295.4U CN219209067U (en) | 2023-01-13 | 2023-01-13 | External phase splitting device of MMA refining procedure dehydration tower |
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| CN202320081295.4U CN219209067U (en) | 2023-01-13 | 2023-01-13 | External phase splitting device of MMA refining procedure dehydration tower |
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