CN217490331U

CN217490331U - Butylene acetonitrile mixture and butane acetonitrile mixture separation system in methyl ethyl ketone production

Info

Publication number: CN217490331U
Application number: CN202123420647.4U
Authority: CN
Inventors: 金俊勇; 陈晓春; 隋培勇
Original assignee: Qingdao Siyuan Chemical Co ltd
Current assignee: Qingdao Siyuan Chemical Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-09-27
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a butene acetonitrile mixture and butane acetonitrile mixture piece-rate system in methyl ethyl ketone production belongs to methyl ethyl ketone industrial production technical field. The technical scheme is as follows: the device comprises a first washing tower, wherein the lower part of the first washing tower is connected with a feeding pipeline, the upper part of the first washing tower is connected with a water inlet pipeline, the top of the first washing tower is connected with a top extraction pipeline of the washing tower, the bottom of the first washing tower is connected with a bottom extraction pipeline of the first washing tower, and the bottom extraction pipeline of the first washing tower is connected with a feeding hole of a rectifying tower; the bottom of the rectifying tower is provided with a reboiler, the top of the rectifying tower is connected with a top extraction pipeline of the rectifying tower, the top extraction pipeline of the rectifying tower is connected with a feed inlet of a condenser, a discharge port of the condenser is connected with a reflux port of the rectifying tower through a reflux pipeline of the rectifying tower, and a reflux pipeline of the rectifying tower is connected with a pump. The utility model discloses a washing and rectification, the waste water cyclic utilization with washing acetonitrile.

Description

Butylene acetonitrile mixture and butane acetonitrile mixture separation system in methyl ethyl ketone production

Technical Field

The utility model relates to a methyl ethyl ketone industrial production technical field, concretely relates to butene acetonitrile mixture and butane acetonitrile mixture piece-rate system in methyl ethyl ketone production.

Background

Methyl Ethyl Ketone (MEK) is also called butanone, is an organic solvent with excellent performance and wide application, can be mutually dissolved with various hydrocarbon solvents, and has excellent solubility and drying property. The industrial production method of methyl ethyl ketone mainly comprises an n-butene oxidation method, a 2, 3-butanediol dehydration method, a co-production method and the like. The two-step oxidation method of n-butene is the most main method for producing methyl ethyl ketone at present, and comprises the steps of preparing sec-butyl alcohol by hydrating n-butene, and dehydrogenating the sec-butyl alcohol to generate methyl ethyl ketone; the gas phase dehydrogenation generated gas of the sec-butyl alcohol contains methyl ethyl ketone, sec-butyl alcohol and a small amount of heavy matters, and the mixture enters a subsequent refining and separating unit to separate the components by utilizing the difference of the volatility of each component in the mixture.

Because the raw materials of c4 mainly comprise n-butane and butylene, if ordinary rectification is adopted, separation is difficult to realize, the only choice is extractive rectification, at present, a proper extracting agent is acetonitrile, but the separated butylene and butane both contain acetonitrile, the acetonitrile is expensive, and the acetonitrile carried away by butylene can cause the inactivation of a hydration catalyst, so that the acetonitrile carried in butylene and butane needs to be recovered.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, the butene acetonitrile mixture and the butane acetonitrile mixture separation system in the methyl ethyl ketone production are provided, the butene acetonitrile mixture and the butane acetonitrile mixture are separated and recovered through water washing and rectification, and the waste water of water washing acetonitrile is recycled.

The technical scheme of the utility model is that:

the system for separating the butene acetonitrile mixture and the butane acetonitrile mixture in the production of the methyl ethyl ketone comprises a first washing tower and a second washing tower, wherein the lower parts of the first washing tower and the second washing tower are respectively connected with a feeding pipeline, the upper parts of the first washing tower and the second washing tower are respectively connected with a water inlet pipeline, the top parts of the first washing tower and the second washing tower are respectively connected with a top extraction pipeline of the washing tower, the bottom parts of the first washing tower and the second washing tower are respectively connected with a bottom extraction pipeline of the washing tower, and the bottom extraction pipeline of the washing tower is connected with a feeding hole of a rectifying tower; the bottom of the rectifying tower is provided with a reboiler, the top of the rectifying tower is connected with a top extraction pipeline of the rectifying tower, the top extraction pipeline of the rectifying tower is connected with a feed inlet of a condenser, a discharge outlet of the condenser is connected with a reflux port of the rectifying tower through a reflux pipeline of the rectifying tower, and a reflux pipeline of the rectifying tower is connected with a pump; the bottom of the rectifying tower is connected with a tower bottom extraction pipeline of the rectifying tower, the tower bottom extraction pipeline of the rectifying tower is connected with a feed inlet of a cooler, and a pump is connected to the tower bottom extraction pipeline of the rectifying tower; the discharge port of the cooler is connected with the circulating ports of the first water washing tower and the second water washing tower through a circulating pipeline; install the feeding distributor respectively at feed inlet, water inlet, circulation mouth department in first washing tower and the second washing tower, the feeding distributor includes vertical inlet pipe, and the bottom of vertical inlet pipe is connected with the horizontal distribution pipe, and the bottom of horizontal distribution pipe is connected with a plurality of and horizontal distribution pipe vertically horizontal distribution branch pipe along length direction interval, is equipped with a plurality of liquid hole along length direction interval on the lateral wall of horizontal distribution branch pipe.

Preferably, a rectification column reflux tank is further connected to the rectification column reflux line.

Preferably, a rectifying tower buffer tank is further connected to the bottom extraction pipeline of the rectifying tower.

Preferably, the bottom end of the horizontal distribution pipe is detachably connected with a plurality of connecting pipes, and the connecting pipes are communicated with the horizontal distribution pipe; the connecting pipe is detachably connected with the horizontal distribution branch pipe.

Compared with the prior art, the utility model, following beneficial effect has:

the utility model washes the butene acetonitrile mixture and the butane acetonitrile mixture respectively through the first washing tower and the second washing tower, and separates the butene acetonitrile mixture and the butane acetonitrile mixture by utilizing the difference of the solubility of the butene acetonitrile and the butane in water; rectifying the water containing acetonitrile obtained from the tower bottom by a rectifying tower, and separating and recovering the acetonitrile by utilizing the difference of water and acetonitrile volatility; and the distillate at the tower bottom is qualified wastewater, and is cooled and then circularly washed, so that the wastewater of washing acetonitrile is recycled.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Figure 2 is a front view of the feed distributor of the present invention.

Figure 3 is a side view of the feed distributor of the present invention.

In the figure, 1-a first washing tower, 2-a second washing tower, 3-a feeding pipeline, 4-a water inlet pipeline, 5-a top extraction pipeline of the washing tower, 6-a bottom extraction pipeline of the washing tower, 7-a rectifying tower, 8-a reboiler, 9-a top extraction pipeline of the rectifying tower, 10-a condenser, 11-a reflux pipeline of the rectifying tower, 12-a pump, 13-a bottom extraction pipeline of the rectifying tower, 14-a cooler, 15-a circulating pipeline, 1601-a vertical feeding pipe, 1602-a horizontal distribution pipe, 1603-a horizontal distribution branch pipe, 1604-a liquid outlet hole, 1605-a connecting pipe, 17-a reflux tank of the rectifying tower and 18-a buffer tank of the rectifying tower are arranged.

Detailed Description

Example 1

As shown in fig. 1-3, the present embodiment provides a system for separating a butene acetonitrile mixture and a butane acetonitrile mixture in methyl ethyl ketone production, which includes a first washing tower 1 and a second washing tower 2, wherein the lower portions of the first washing tower 1 and the second washing tower 2 are respectively connected to a feeding pipeline 3, the upper portions of the first washing tower 1 and the second washing tower 2 are respectively connected to a water feeding pipeline 4, the top portions of the first washing tower 1 and the second washing tower 2 are respectively connected to a top extraction pipeline 5 of the washing tower, the bottom portions of the first washing tower 1 and the second washing tower 2 are respectively connected to a bottom extraction pipeline 6 of the washing tower, and the bottom extraction pipeline 6 of the washing tower is connected to a feeding port of a rectifying tower 7; the bottom of the rectifying tower 7 is provided with a reboiler 8, the top of the rectifying tower is connected with a top extraction pipeline 9 of the rectifying tower, the top extraction pipeline 9 of the rectifying tower is connected with a feed inlet of a condenser 10, a discharge outlet of the condenser 10 is connected with a reflux port of the rectifying tower 7 through a reflux pipeline 11 of the rectifying tower, and the reflux pipeline 11 of the rectifying tower is connected with a pump 12; the bottom of the rectifying tower 7 is connected with a rectifying tower bottom extraction pipeline 13, the rectifying tower bottom extraction pipeline 13 is connected with a feed inlet of a cooler 14, and the rectifying tower bottom extraction pipeline 13 is connected with a pump 12; the discharge port of the cooler 14 is connected with the circulating ports of the first water scrubber 1 and the second water scrubber 2 through a circulating pipeline 15; first water scrubber 1 and second water scrubber 2 are inherent feed inlet, water inlet, circulation mouth department installs the feeding distributor respectively, the feeding distributor includes vertical inlet pipe 1601, and horizontal distribution pipe 1602 is connected to the bottom of vertical inlet pipe 1601, and horizontal distribution pipe 1602's bottom is connected with a plurality of and horizontal distribution pipe 1602 vertically horizontal distribution branch pipe 1603 along length direction interval, and it is equipped with a plurality of liquid hole 1604 to separate along length direction on the lateral wall of horizontal distribution branch pipe 1603.

The working process is as follows: the wastewater is washed by the first water washing tower 1, acetonitrile and butylene are separated by utilizing the difference of the solubility of the acetonitrile and the butylene in water, high-purity butyl thin is obtained at the tower top, and water containing acetonitrile is obtained at the tower bottom. The produced substance at the top of the tower enters a tank area after dehydration, and the produced substance at the bottom of the tower enters a rectifying tower 7 for rectification. The second washing tower 2 adopts liquid-liquid extraction, and uses the difference of the solubility of acetonitrile and butane in water to separate, so that the butane with high purity is obtained at the tower top, the water containing acetonitrile is obtained at the tower bottom, and the water containing acetonitrile at the tower bottom enters a rectifying tower 7 to be rectified.

By utilizing the different volatility of water and acetonitrile, azeotropic components of acetonitrile and water are extracted from the top of the rectifying tower 7, a part of the azeotropic components is pumped back to the rectifying tower 7 for rectification again after being cooled by a condenser 10, and the other part of the azeotropic components enters an acetonitrile feeding buffer tank; the tower bottom distillate is qualified wastewater, is pressurized by a pump 12, is cooled by a cooler 14, and then returns to the first water washing tower 1 and the second water washing tower 2 to participate in washing again. The utility model discloses utilize the waste water after the processing as the washing water, greatly reduced the washing tower water consumption, reduced the emission of sewage simultaneously, practiced thrift the production energy consumption cost greatly.

The first water washing tower 1 and the second water washing tower 2 are sieve plate towers, 38 layers of sieve plate tower trays are arranged in the sieve plate towers, and the sieve plates are made of 316L materials. The feeding pipeline 3 is connected below the 38 th layer sieve plate tower tray, the water inlet pipeline 4 is connected above the 1 st layer sieve plate tower tray, the circulating pipeline 15 is connected between the 13 th layer sieve plate tower tray and the 14 th layer sieve plate tower tray, and the middle part circulating washing of the first washing tower 1 and the second washing tower 2 is increased. The bottom extraction line 6 of the water washing tower is connected between the 17 th layer and the 22 th layer of the tower plate of the rectifying tower 7. The cooler 14 adopts a floating head heat exchanger, and the condenser 10 and the reboiler 8 at the top of the rectifying tower 7 both adopt fixed tube-plate heat exchangers. The pump 12 on the reflux pipeline 11 of the rectifying tower and the pump on the extraction pipeline 13 at the bottom of the rectifying tower adopt conventional centrifugal pumps.

Meanwhile, as shown in fig. 2 to 3, in this embodiment, feed distributors are installed in the first water scrubber 1 and the second water scrubber 2, and the material, the fresh washing water, and the circulating washing water enter the towers through the feed distributors at the positions. The feeding distributor of this embodiment can make material and washing water distribute to the tower in through going out liquid hole 1604 on horizontal distribution branch pipe 1603 evenly, guarantees the washing efficiency. Preferably, the bottom end of the horizontal distribution pipe 1602 is detachably connected with a plurality of connecting pipes 1605, and the connecting pipes 1605 are communicated with the horizontal distribution pipe 1602; the connection pipe 1605 is detachably connected to the horizontal distribution branch pipe 1603 by a conventional method such as a screw connection. The horizontal distribution pipe 1602 and the horizontal distribution branch pipe 1603 are detachably connected together through a connection pipe 1605, so that the installation and maintenance of the feed distributor are facilitated.

Through the utility model discloses a system separable recovery butene, butane and acetonitrile, but and the sewage discharge that significantly reduces.

Example 2

In addition to the embodiment 1, a rectification column reflux tank 17 is connected to the rectification column reflux pipeline 11. A rectifying tower buffer tank 18 is also connected to the rectifying tower bottom extraction pipeline 13. The rectifying tower reflux tank 17 and the rectifying tower buffer tank 18 can play a role in buffering and storing, and the continuous work of the system is ensured.

Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and substance of the present invention, and these modifications or substitutions are intended to be within the scope of the present invention/any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. Butene acetonitrile mixture and butane acetonitrile mixture piece-rate system in methyl ethyl ketone production, its characterized in that:

the device comprises a first washing tower (1) and a second washing tower (2), wherein the lower parts of the first washing tower (1) and the second washing tower (2) are respectively connected with a feeding pipeline (3), the upper parts of the first washing tower (1) and the second washing tower (2) are respectively connected with a water inlet pipeline (4), the top parts of the first washing tower (1) and the second washing tower (2) are respectively connected with a washing tower top extraction pipeline (5), the bottom parts of the first washing tower (1) and the second washing tower (2) are respectively connected with a washing tower bottom extraction pipeline (6), and the washing tower bottom extraction pipeline (6) is connected with a feeding hole of a rectifying tower (7); a reboiler (8) is arranged at the bottom of the rectifying tower (7), the top of the rectifying tower is connected with a rectifying tower top extraction pipeline (9), the rectifying tower top extraction pipeline (9) is connected with a feed inlet of a condenser (10), a discharge outlet of the condenser (10) is connected with a reflux port of the rectifying tower (7) through a rectifying tower reflux pipeline (11), and the rectifying tower reflux pipeline (11) is connected with a pump (12); the bottom of the rectifying tower (7) is connected with a rectifying tower bottom extraction pipeline (13), the rectifying tower bottom extraction pipeline (13) is connected with a feed inlet of a cooler (14), and the rectifying tower bottom extraction pipeline (13) is connected with a pump (12); a discharge hole of the cooler (14) is connected with circulation ports of the first water washing tower (1) and the second water washing tower (2) through a circulation pipeline (15);

first water scrubber (1) and second water scrubber (2) inherent feed inlet, water inlet, circulation mouth department install the feeding distributor respectively, the feeding distributor includes vertical inlet pipe (1601), and horizontal distribution pipe (1602) are connected with to the bottom of vertical inlet pipe (1601), and the bottom of horizontal distribution pipe (1602) is connected with a plurality of and horizontal distribution pipe vertically horizontal distribution branch pipe (1603) along length direction interval, is equipped with a plurality of liquid hole (1604) along length direction interval on the lateral wall of horizontal distribution branch pipe (1603).

2. The system for separating the mixture of butene and acetonitrile and the mixture of butane and acetonitrile in the production of methyl ethyl ketone as claimed in claim 1, wherein: and the rectifying tower reflux pipeline (11) is also connected with a rectifying tower reflux tank (17).

3. The system for separating the mixture of butene and acetonitrile and the mixture of butane and acetonitrile in the production of methyl ethyl ketone according to claim 1, wherein: a rectifying tower buffer tank (18) is also connected to the bottom extraction pipeline (13) of the rectifying tower.

4. The system for separating the mixture of butene and acetonitrile and the mixture of butane and acetonitrile in the production of methyl ethyl ketone as claimed in claim 1, wherein: the bottom end of the horizontal distribution pipe (1602) is detachably connected with a plurality of connecting pipes (1605), and the connecting pipes (1605) are communicated with the horizontal distribution pipe (1602); the connecting pipe (1605) is detachably connected with the horizontal distribution branch pipe (1603).