CN212425919U

CN212425919U - Methanol separator for dimethyl ether synthesis

Info

Publication number: CN212425919U
Application number: CN202020938963.7U
Authority: CN
Inventors: 刘兴禄; 石红兵; 何利生; 杨家元; 刘永忠; 李仲勤
Original assignee: Chongqing Wanlilai Chemical Co ltd
Current assignee: Chongqing Wanlilai Chemical Co ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2021-01-29
Anticipated expiration: 2030-05-28

Abstract

The utility model discloses a methanol separator for dimethyl ether synthesis, which comprises a rectifying tower, a heat exchanger and a reboiler, wherein the middle layer of the rectifying tower is provided with a feed inlet, the heat exchanger is communicated with the top layer of the rectifying tower through a first connecting pipe, and the feed inlet of the reboiler is communicated with the bottom end of the rectifying tower through a second connecting pipe, the utility model relates to the technical field of dimethyl ether synthesis, the methanol separator for dimethyl ether synthesis has simple structure and convenient operation, a membrane separation device is additionally arranged on the feed outlet of the reboiler, water and methanol are separated by utilizing the passing rate of passing through a membrane, a heating component is arranged, according to the characteristic that the separation temperature of the methanol is higher than the separation temperature of the dimethyl ether, heat exchange liquid firstly passes through a membrane box and then enters the reboiler, methanol is evaporated by absorbing a part of heat through the methanol, then the liquid in the reboiler is heated, the energy utilization rate is improved, and, the equipment operation steps are few, and the maintenance work intensity is reduced for the later stage.

Description

Methanol separator for dimethyl ether synthesis

Technical Field

The utility model relates to a dimethyl ether synthesis technical field specifically is a methyl alcohol separator for dimethyl ether synthesis.

Background

Dimethyl ether is a flammable gas. Mixing with air can form an explosive mixture. Mainly used as a methylating agent for producing dimethyl sulfate, the dimethyl ether is mainly prepared by a two-step method or a one-step method at present, wherein two methods are relatively common industrial means, and dimethyl ether is prepared by methanol synthesis and methanol dehydration, the product synthesized in the industry comprises methanol and dimethyl ether, so the dimethyl ether and the methanol need to be separated, the existing separation is carried out by distillation separation through rectifying equipment, the existing rectifying device is composed of a rectifying tower body, a condenser, a reflux tank, a reboiler and other equipment, in the using process, the separation of the methanol is positioned at the bottom of the rectifying tower and needs to be separately distilled and separated from the water, thereby not only increasing the working procedures and the cost, in addition, the operation and maintenance cost and the maintenance difficulty of a set of distillation equipment are increased, and therefore, the scheme is generated by deeply researching the problems.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art, the utility model provides a methyl alcohol separator for dimethyl ether synthesis to solve one of the technical problem that prior art exists at least.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a methanol separator for dimethyl ether synthesis comprises a rectifying tower, a heat exchanger and a reboiler, wherein a feed inlet is formed in the middle layer of the rectifying tower, the heat exchanger is communicated with the top layer of the rectifying tower through a first connecting pipe, a feed inlet of the reboiler is communicated with the bottom end of the rectifying tower through a second connecting pipe, and a membrane separation device is arranged on a feed inlet of the reboiler;

the membrane separation device includes: the device comprises a membrane box, a U-shaped pipe, a control valve, an annular plate, a plurality of bolts, a membrane passing channel, a pumping-out channel and a heating assembly;

the membrane case passes through U type pipe and reboiler feed opening intercommunication, be equipped with the control valve on the U type pipe, the membrane incasement is annular array and has seted up a plurality of mounting holes, the annular plate install in the membrane incasement and correspond the position with a plurality of mounting holes on it and seted up a plurality of screw holes, it is a plurality of the bolt passes a plurality of mounting hole threaded connection is in a plurality of in the threaded hole, install on the annular plate through the membrane, membrane bottom of the case end is connected with and takes out from the passageway, heating element installs on the membrane case and extends to on the reboiler.

Preferably, the heating assembly comprises: the heat exchanger comprises a plurality of heating pipes, a plurality of first heat exchange pipes and a plurality of second heat exchange pipes;

a plurality of pairs of matched butt joint holes are formed in two sides of the membrane box, the heating pipes are communicated with the plurality of butt joint holes in one side, a plurality of pairs of butt joint holes are connected with a plurality of first heat exchange pipes, and a plurality of second heat exchange pipes are communicated between the plurality of butt joint holes in the other side and the reboiler.

Preferably, the control valve is a one-way valve, and the one-way direction is that fluid enters the membrane tank from the reboiler.

Preferably, the top end of the membrane box is connected with a methanol absorption pipe.

Preferably, a transition pipe is arranged between the U-shaped pipe and the membrane box, and the position of the transition pipe is higher than the heights of the heating pipes.

Preferably, a pair of flanges with the same structure is arranged at two ends of the U-shaped pipe, and a pair of flanges with the same specification are respectively arranged on the membrane box and the feed opening of the reboiler which are matched with the flanges and connected with the U-shaped pipe.

Advantageous effects

The utility model provides a methyl alcohol separator for dimethyl ether synthesis. The method has the following beneficial effects: this methyl alcohol separator for dimethyl ether synthesis simple structure, high durability and convenient operation, through install membrane separation device additional on the feed opening at the reboiler, the utilization is through the percent of pass of membrane, with water and methyl alcohol separation, and be equipped with heating element, the separation temperature according to methyl alcohol is higher than the separation temperature of dimethyl ether's characteristics, get into the reboiler with heat transfer liquid earlier through the membrane case, absorb partly heat evaporation methyl alcohol through methyl alcohol, then heat liquid in the reboiler again, can not only improve energy utilization and rate but also area is little, equipment operation step is few, reduce maintenance working strength for the later stage.

Drawings

Fig. 1 is a schematic structural diagram of a methanol separator for dimethyl ether synthesis according to the present invention.

Fig. 2 is a schematic diagram of a partial overlooking structure of the methanol separator for dimethyl ether synthesis according to the present invention.

Fig. 3 is a schematic diagram of a partial top sectional structure of a methanol separator for dimethyl ether synthesis according to the present invention.

Fig. 4 is a schematic diagram of a partial side view and sectional structure of a methanol separator for dimethyl ether synthesis according to the present invention.

In the figure: 1. a rectifying tower; 2. a heat exchanger; 3. a reboiler; 4. a membrane box; 5. a U-shaped pipe; 6. a control valve; 7. an annular plate; 8. a bolt; 9. passing through a membrane; 10. a pumping-out channel; 11. heating a tube; 12. a first heat exchange tube; 13. a second heat exchange tube; 14. a methanol absorption pipe; 15. a transition duct; 16. a flange plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

All the electrical components in the present application are connected with the power supply adapted to the electrical components through a wire, and an appropriate controller and an appropriate encoder should be selected according to actual conditions to meet control requirements, and specific connection and control sequences should be obtained.

Example (b): according to the attached figures 1-4 of the specification, the methanol separator for dimethyl ether synthesis comprises a rectifying tower 1, a heat exchanger 2 and a reboiler 3, wherein a feed inlet is arranged on the middle layer of the rectifying tower 1, the heat exchanger 2 is communicated with the top layer of the rectifying tower 1 through a first connecting pipe, a feed inlet of the reboiler 3 is communicated with the bottom end of the rectifying tower 1 through a second connecting pipe, a membrane separation device is arranged on a feed outlet of the reboiler 3, in the specific implementation process, the feed inlet on the middle layer of the rectifying tower 1 guides materials into the middle layer of the rectifying tower 1, gas in high-temperature distillation flows upwards, liquid flows downwards, the gas enters the heat exchanger 2 through the first connecting pipe, the dimethyl ether and the methanol are separated through strict temperature control in the heat exchanger 2, the methanol flows back into the rectifying tower 1, then the liquid is collected at the bottom of the rectifying tower 1 and flows into the reboiler 3 through the second connecting pipe, and is, heating the residual dimethyl ether into bubbles, returning the bubbles into the rectifying tower 1 through a pipeline for upward flow, and allowing the methanol and the water to flow into the membrane separation device through a feed opening of a reboiler 3;

as can be seen from fig. 1 to 4 of the specification, the membrane separation device comprises: the membrane box 4, the U-shaped pipe 5, the control valve 6, the annular plate 7, the bolts 8, the passing membrane 9, the drawing-off channel 10 and the heating assembly are connected and positioned as follows;

the membrane box 4 is communicated with a feed opening of the reboiler 3 through a U-shaped tube 5, a control valve 6 is arranged on the U-shaped tube 5, a plurality of mounting holes are formed in the membrane box 4 in an annular array mode, an annular plate 7 is installed in the membrane box 4, a plurality of threaded holes are formed in the annular plate 7 and correspond to the mounting holes in position, a plurality of bolts 8 penetrate through the mounting holes and are in threaded connection with the threaded holes, the annular plate 7 is installed on the membrane 9, the bottom end of the membrane box 4 is connected with a drawing-off channel 10, and a heating assembly is installed on the membrane box 4 and extends to the reboiler;

in the specific implementation process, methanol and water flow into the membrane box 4 from a feed opening of the reboiler 3 through the U-shaped pipe 5, the heating component penetrates out of the membrane box 4 to be connected with a heating pipe 11 of the reboiler 3 to supply heat to the reboiler 3, because the evaporation temperature of the methanol is higher than that of the dimethyl ether, after liquid with a certain height is accumulated in the membrane box 4, the temperature of the heating component is increased to heat the mixed liquid of the methanol and the water, the temperature of the heating component is controlled to evaporate the methanol and the methanol is discharged from the top end of the membrane box 4, and because the water passes through the membrane 9 at the bottom in the membrane box 4, water molecules can pass through the membrane of the membrane 9, and because the molecules of the water molecules are smaller than the molecules of the methanol, the water molecules fall down from the membrane 9 in the annular plate 7, the annular plate 7 is fixed through the bolt 8, so that the positioning, the disassembly and the water are convenient, and;

to sum up the totality can know, this methyl alcohol separator for dimethyl ether synthesis simple structure, and convenient operation, through install membrane separation device additional on reboiler 3's feed opening, utilize the percent of pass through membrane 9, with water and methyl alcohol separation, and be equipped with heating element, according to the high characteristics of the separation temperature than dimethyl ether of methyl alcohol, get into reboiler 3 through membrane 9 case 4 earlier with heat transfer liquid, absorb partly heat evaporation methyl alcohol through methyl alcohol, and then heat liquid in the reboiler 3, can not only improve energy utilization and area is little, equipment operation step is few, for later stage reduction maintenance working strength.

Preferably, as can be seen from fig. 1 to 4 of the specification, the heating assembly includes: the heat exchanger comprises a plurality of heating pipes 11, a plurality of first heat exchange pipes 12 and a plurality of second heat exchange pipes 13, wherein the connection relationship and the position relationship are as follows;

a plurality of pairs of matched butt holes are formed in two sides of the membrane box 4, the heating pipes 11 are communicated with the butt holes in one side, a plurality of first heat exchange pipes 12 are connected between the butt holes, and a plurality of second heat exchange pipes 13 are communicated between the butt holes in the other side and the reboiler 3;

in the specific implementation process, the first heat exchange tube 12 feeds hot water into the heating tube 11, and the liquid in the membrane box 4 is discharged from one side of the second heat exchange tube 13 after absorbing heat.

Preferably, the control valve 6 is a one-way valve, and the one-way direction is that the fluid enters the membrane tank 4 from the reboiler 3, so as to avoid the liquid from flowing back into the reboiler 3.

Preferably, a methanol absorption pipe 14 is connected to the top end of the membrane tank 4 for collecting methanol.

Preferably, a transition pipe 15 is arranged between the U-shaped pipe 5 and the membrane box 4, and the position of the transition pipe 15 is higher than the height of the heating pipes 11, so that the heating pipes 11 are completely immersed by liquid.

Preferably, a pair of flanges 16 with the same structure are arranged at two ends of the U-shaped pipe 5, and a pair of flanges 16 with the same specification are respectively arranged on the matched membrane box 4 and the feed opening of the reboiler 3 to be connected with the U-shaped pipe 5, so that the U-shaped pipe 5 is convenient to install and replace.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A methanol separator for dimethyl ether synthesis comprises a rectifying tower (1), a heat exchanger (2) and a reboiler (3), and is characterized in that a feed inlet is formed in the middle layer of the rectifying tower (1), the heat exchanger (2) is communicated with the top layer of the rectifying tower (1) through a first connecting pipe, a feed inlet of the reboiler (3) is communicated with the bottom end of the rectifying tower (1) through a second connecting pipe, and a membrane separation device is arranged at a feed outlet of the reboiler (3);

the membrane separation device includes: the device comprises a membrane box (4), a U-shaped pipe (5), a control valve (6), an annular plate (7), a plurality of bolts (8), a passing membrane (9), a drawing-off channel (10) and a heating assembly;

membrane case (4) are through U type pipe (5) and reboiler (3) feed opening intercommunication, be equipped with control valve (6) on U type pipe (5), be annular array in membrane case (4) and seted up a plurality of mounting holes, annular plate (7) install in membrane case (4) and on it correspond the position with a plurality of mounting holes and seted up a plurality of screw holes, it is a plurality of bolt (8) pass a plurality of mounting hole threaded connection is in a plurality of in the screw hole, install on annular plate (7) through membrane (9), membrane case (4) bottom is connected with and takes out from passageway (10), heating element installs on membrane case (4) and extends to reboiler (3).

2. The methanol separator for dimethyl ether synthesis according to claim 1, wherein the heating unit comprises: a plurality of heating pipes (11), a plurality of first heat exchange pipes (12) and a plurality of second heat exchange pipes (13);

a plurality of butt joint holes matched with each other are formed in the two sides of the membrane box (4), the heating pipes (11) are communicated with the butt joint holes in one side, a plurality of pairs of first heat exchange pipes (12) are connected between the butt joint holes, and the second heat exchange pipes (13) are communicated between the plurality of butt joint holes in the other side and the reboiler (3).

3. The methanol separator for dimethyl ether synthesis according to claim 1, wherein the control valve (6) is a one-way valve, and the one-way direction is that the fluid enters the membrane tank (4) from the reboiler (3).

4. The methanol separator for dimethyl ether synthesis according to claim 1, wherein the top end of the membrane tank (4) is connected with a methanol absorption pipe (14).

5. The methanol separator for dimethyl ether synthesis according to claim 2, wherein a transition pipe (15) is arranged between the U-shaped pipe (5) and the membrane box (4), and the position of the transition pipe (15) is higher than the height of the heating pipes (11).

6. The methanol separator for dimethyl ether synthesis according to claim 1, wherein a pair of flanges (16) with the same structure are arranged at two ends of the U-shaped pipe (5), and a pair of flanges (16) with the same specification are respectively arranged on the matched membrane box (4) and the feed opening of the reboiler (3) and connected with the U-shaped pipe (5).