CN213924579U - A novel apparatus for producing for methyl acetate is hydrolysised - Google Patents
A novel apparatus for producing for methyl acetate is hydrolysised Download PDFInfo
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- CN213924579U CN213924579U CN202022692551.2U CN202022692551U CN213924579U CN 213924579 U CN213924579 U CN 213924579U CN 202022692551 U CN202022692551 U CN 202022692551U CN 213924579 U CN213924579 U CN 213924579U
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Abstract
The utility model relates to a novel apparatus for producing for methyl acetate is hydrolysised, include from last reactor, last rectifying column festival, well reactor, well rectifying column festival, lower reactor and lower rectifying column festival that down sets gradually, the entry of going up the reactor is used for the input of raw materials water, and the export of going up the reactor is connected with the backward flow mouth of last rectifying column festival, and the bottom discharge gate of going up the rectifying column festival is connected with the feed inlet of well reactor, the discharge gate of well reactor is connected with the top feed inlet of well rectifying column festival, and the bottom discharge gate of well rectifying column festival is connected with the feed inlet of lower reactor, and methyl acetate raw materials are imported from the entry of lower reactor, and the discharge gate of lower reactor is connected with the top feed inlet of lower rectifying column festival; resin catalysts are filled in the upper reactor, the middle reactor and the lower reactor. The utility model relates to a rationally, to hydrolyze the reaction and independently open with the rectifying column in the space, the loading or the change of the resin catalyst in the reactor of being convenient for, convenient operation.
Description
The technical field is as follows:
the utility model relates to a novel apparatus for producing for methyl acetate is hydrolysised.
Background art:
in the production process of polyvinyl alcohol and purified terephthalic acid, a large amount of methyl acetate, which is a by-product, is produced and cannot be directly utilized due to impurities contained therein. At present, in the enterprises of producing polyvinyl alcohol and purified terephthalic acid, methyl acetate is converted into acetic acid and methanol through hydrolysis reaction, then the acetic acid is used as a solvent or a raw material to be recycled to the prior art, and the generated methanol is sold. Since the hydrolysis reaction of methyl acetate is limited by chemical equilibrium, various methyl acetate catalytic hydrolysis processes have been developed to increase the hydrolysis rate of methyl acetate. The catalytic reaction rectification technology organically couples the catalytic reaction and the rectification separation together, removes the hydrolysate during the reaction, improves the concentration of reactants in a catalytic reaction section, promotes the reaction to move towards the positive reaction direction, and realizes the complete conversion of the methyl acetate. The common feature of these hydrolysis processes is that cation exchange resin is used as the catalyst, and the resin is in the form of particles, and in order to achieve good catalytic performance, the resin needs to be fixed at a proper position in the rectification column, which makes the filling or replacement of the catalyst in the rectification column difficult.
The utility model has the following contents:
the utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a novel apparatus for producing for methyl acetate is hydrolysised is provided.
In order to realize the purpose, the utility model discloses a technical scheme is: a novel production device for methyl acetate hydrolysis comprises an upper reactor, an upper rectifying tower section, a middle reactor, a middle rectifying tower section, a lower reactor and a lower rectifying tower section which are sequentially arranged from top to bottom, wherein an inlet of the upper reactor is used for inputting raw material water, an outlet of the upper reactor is connected with a backflow port of the upper rectifying tower section, a bottom discharge port of the upper rectifying tower section is connected with a feed inlet of the middle reactor, a discharge port of the middle reactor is connected with a top feed inlet of the middle rectifying tower section, a bottom discharge port of the middle rectifying tower section is connected with a feed inlet of the lower reactor, methyl acetate raw material is input from an inlet of the lower reactor, and a discharge port of the lower reactor is connected with a top feed inlet of the lower rectifying tower section; resin catalysts are filled in the upper reactor, the middle reactor and the lower reactor.
Furthermore, the upper side of the upper rectifying tower section is provided with a condenser, a tower top gas phase outlet of the upper rectifying tower section is connected with a gas phase inlet of the condenser, and a liquid phase outlet of the condenser is connected with an inlet of the upper reactor.
Furthermore, a top gas phase outlet of the middle rectifying tower section is connected with a bottom gas phase inlet of the upper rectifying tower section.
Furthermore, a top gas phase outlet of the lower rectifying tower section is connected with a bottom gas phase inlet of the middle rectifying tower section, two outlets are arranged at the bottom of the lower rectifying tower section, one outlet is connected with an inlet of a reboiler, the other outlet is used for outputting hydrolysate, and an outlet of the reboiler is connected with the bottom gas phase inlet of the lower rectifying tower section.
Further, the upper reactor, the middle reactor and the lower reactor are all in the form of fixed beds.
Compared with the prior art, the utility model discloses following effect has: the utility model relates to a rationally, to hydrolyze the reaction and independently open with the rectifying column in the space, the loading or the change of the resin catalyst in the reactor of being convenient for, convenient operation.
Description of the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure:
1-upper rectifying tower section; 2-middle rectification tower section; 3-lower rectifying tower section; 4-a condenser; 5-a reboiler; 6-reactor installation; 7-middle reactor; 8-lower reactor.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in figure 1, the utility model relates to a novel apparatus for producing for methyl acetate is hydrolysised, include from the last reactor 6 that down sets gradually, go up rectifying column festival 1, well reactor 7, well rectifying column festival 2, lower reactor 8 and lower rectifying column festival 3, upward be equipped with the resin catalyst in reactor 6, well reactor 7 and the lower reactor 8.
The inlet of the upper reactor 6 is used for inputting raw material water the upper side of the upper rectifying tower section 1 is provided with a condenser 4, the gas phase outlet at the top of the upper rectifying tower section 1 is connected with the gas phase inlet of the condenser 4, the liquid phase outlet of the condenser 4 is connected with the inlet of the upper reactor 6, the outlet of the upper reactor 6 is connected with the reflux inlet of the upper rectifying tower section 1, and thus, under the action of gravity, liquid phase materials of the condenser flow into the upper rectifying tower section after passing through the upper reactor.
Go up the bottom discharge gate of rectifying column festival 1 and be connected with the feed inlet of well reactor 7, the discharge gate of well reactor 7 is connected with the top feed inlet of well rectifying column festival 2, the top gaseous phase export of well rectifying column festival 2 and the bottom gaseous phase access connection of last rectifying column festival 1, the bottom discharge gate of well rectifying column festival 2 is connected with the feed inlet of reactor 8 down, methyl acetate raw materials from the entry input of reactor 8 down, the discharge gate of reactor 8 is connected with the top feed inlet of lower rectifying column festival 3 down, the top gaseous phase export of lower rectifying column festival 3 and the bottom gaseous phase access connection of well rectifying column festival 2. The bottom of the lower rectifying tower section 3 is provided with two outlets, one outlet is connected with an inlet of a reboiler 5, the other outlet is used for outputting hydrolysate, and the outlet of the reboiler 5 is connected with a gas phase inlet at the bottom of the lower rectifying tower section 3.
In operation, feed water is fed from the inlet of the upper reactor 6 and methyl acetate feed is fed from the inlet of the lower reactor 8. Under the heating action of the reboiler 5, gas phase materials sequentially pass through the lower rectifying tower section 3, the middle rectifying tower section 2 and the upper rectifying tower section 1 and are condensed in the condenser 4, and condensed liquid phase sequentially passes through the upper reactor 6, the upper rectifying tower section 1, the middle reactor 7, the middle rectifying tower section 2, the lower reactor 6 and the lower rectifying tower section 3 from top to bottom and is discharged. The device is characterized in that: the fixed bed reaction and the rectification technology are combined, the hydrolysis reaction of methyl acetate occurs in the fixed bed, the hydrolysis reaction liquid is separated in time in the rectification tower, the deep hydrolysis of methyl acetate is achieved through the synergistic effect of the reaction and the rectification, and the bottom tower section obtains the hydrolysis liquid consisting of acetic acid, methanol and water. The hydrolysis reaction and the rectification separation are independent and coupled with each other, and the method has the characteristics of simple process flow, low equipment investment, convenient operation and more importantly, convenient filling or replacement of the resin catalyst.
In this embodiment, the upper reactor, the middle reactor and the lower reactor are all in the form of a fixed bed, and a resin catalyst is filled in the fixed bed.
It should be noted that the above connections are all communicated through a pipeline so as to facilitate the circulation of materials.
The utility model has the advantages that:
(1) can directly hydrolyze methyl acetate to generate acetic acid and methanol;
(2) the hydrolysis reaction is separated from the rectifying tower in space, so that the filling or replacement of the resin catalyst in the reactor is convenient;
(3) the hydrolysis reaction is arranged outside the rectifying tower, and the reaction temperature and the residence time of the hydrolysis reactor can be independently controlled;
(4) the hydrolysis reaction and the rectification separation are coupled together through pipeline connection, hydrolysate discharged from the reactor is separated in the rectification tower in time, unreacted methyl acetate is used as a light component to rise to a tower top condenser in a gas phase mode under the rectification effect and then returns to the reactor, and the deep hydrolysis of the methyl acetate is realized.
The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (5)
1. The utility model provides a novel apparatus for producing for methyl acetate is hydrolysised which characterized in that: the device comprises an upper reactor, an upper rectifying tower section, a middle reactor, a middle rectifying tower section, a lower reactor and a lower rectifying tower section which are sequentially arranged from top to bottom, wherein an inlet of the upper reactor is used for inputting raw material water, an outlet of the upper reactor is connected with a reflux port of the upper rectifying tower section, a bottom discharge port of the upper rectifying tower section is connected with a feed inlet of the middle reactor, a discharge port of the middle reactor is connected with a top feed inlet of the middle rectifying tower section, a bottom discharge port of the middle rectifying tower section is connected with a feed inlet of the lower reactor, a methyl acetate raw material is input from an inlet of the lower reactor, and a discharge port of the lower reactor is connected with a top feed inlet of the lower rectifying tower section; resin catalysts are filled in the upper reactor, the middle reactor and the lower reactor.
2. The novel production device for methyl acetate hydrolysis according to claim 1, characterized in that: the upside of going up rectifying column festival is equipped with the condenser, goes up the top of the tower gas phase export of rectifying column festival and the gas phase entry linkage of condenser, the liquid phase export of condenser and the entry linkage of last reactor.
3. The novel production device for methyl acetate hydrolysis according to claim 2, characterized in that: and the top gas phase outlet of the middle rectifying tower section is connected with the bottom gas phase inlet of the upper rectifying tower section.
4. The novel production device for methyl acetate hydrolysis according to claim 3, characterized in that: the top gas phase outlet of the lower rectifying tower section is connected with the bottom gas phase inlet of the middle rectifying tower section, the bottom of the lower rectifying tower section is provided with two outlets, one outlet is connected with the inlet of a reboiler, the other outlet is used for outputting hydrolysate, and the outlet of the reboiler is connected with the bottom gas phase inlet of the lower rectifying tower section.
5. The novel production device for methyl acetate hydrolysis according to claim 1, characterized in that: the upper reactor, the middle reactor and the lower reactor all adopt a fixed bed form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022692551.2U CN213924579U (en) | 2020-11-20 | 2020-11-20 | A novel apparatus for producing for methyl acetate is hydrolysised |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022692551.2U CN213924579U (en) | 2020-11-20 | 2020-11-20 | A novel apparatus for producing for methyl acetate is hydrolysised |
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| Publication Number | Publication Date |
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| CN213924579U true CN213924579U (en) | 2021-08-10 |
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| CN202022692551.2U Active CN213924579U (en) | 2020-11-20 | 2020-11-20 | A novel apparatus for producing for methyl acetate is hydrolysised |
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