CN215275805U

CN215275805U - Residual liquid recovery device for dimethyl formamide rectification

Info

Publication number: CN215275805U
Application number: CN202121522335.1U
Authority: CN
Inventors: 张伟杰; 高建明; 张明
Original assignee: Tianjin Diester Energy Saving Equipment Technology Co ltd
Current assignee: Tianjin Diester Energy Saving Equipment Technology Co ltd
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2021-12-24
Anticipated expiration: 2031-07-06

Abstract

The utility model discloses a raffinate recovery unit is used in dimethyl formamide rectification belongs to dimethyl formamide processing technology field, and it includes stills, stills's upper surface and the lower fixed surface of support are connected, the upper surface of support passes through the fixed surface of mounting bracket and motor to be connected, the output shaft of motor passes through the top fixed connection of coupling sleeve and (mixing) shaft. This raffinate recovery unit is used in dimethyl formamide rectification, through setting up stills, mechanical trap, baffle and constant voltage pipe, in its gas gets into the confined space of baffle top, the below of baffle is flowed into through mechanical trap in the little condensation that appears in succession unnecessary gas, unnecessary gas circulates in entering into stills through the backward flow mouth simultaneously, this kind of mode can keep the effect of further drawing in the raffinate of good dimethyl formamide when using, adopt the mode of circulation work to ensure the raffinate recovery effect of maximize.

Description

Residual liquid recovery device for dimethyl formamide rectification

Technical Field

The utility model belongs to the technical field of the dimethyl formamide is handled, specifically be a raffinate recovery unit is used in dimethyl formamide rectification.

Background

Dimethylformamide is a transparent liquid, which is miscible with water and most organic solvents. It is a common solvent for chemical reactions. The pure dimethyl formamide has special odor, has fishy odor in industrial grade or modified dimethyl formamide, is used as an important chemical raw material and a solvent with excellent performance, and is mainly applied to the industries of polyurethane, acrylon, medicine, pesticide, dye, electron and the like. The polyurethane resin is used as a washing curing agent in the polyurethane industry and is mainly used for the production of wet synthetic leather; the compound is used as a synthetic drug intermediate in the pharmaceutical industry and is widely used for preparing doxycycline, cortisone and sulfonamides; the acrylic acid is used as a solvent in the acrylic fiber industry and is mainly used for dry spinning production of acrylic fibers; the method is used for synthesizing high-efficiency low-toxicity pesticide in the pesticide industry; the dye is used as a dye solvent in the dye industry; quenching of tin-plated parts, cleaning of circuit boards and the like in the electronic industry; other industries comprise a carrier of hazardous gas, a solvent for medicine crystallization, an adhesive and the like, the dimethyl formamide wastewater is recovered by a distillation recovery system, part of water is removed by a dehydrating tower firstly, then the dimethyl formamide is purified by a rectifying tower, liquid containing the dimethyl formamide after primary purification is discharged from the top of the rectifying tower, and rectification residual liquid is discharged from the bottom of the rectifying tower. A small amount of dimethylamine, formic acid, methane and other components are dissolved in the liquid discharged from the tower top, and are treated by subsequent deacidification, deamination and other equipment to separate and obtain the high-purity dimethylformamide, so that the dimethylformamide is recycled.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In order to overcome prior art's above-mentioned defect, the utility model provides a raffinate recovery unit is used in dimethylformamide rectification has solved present preparation in-process, still remains certain dimethylformamide in its waste liquid, and dimethylformamide is the pollutant, and direct emission can cause the injury to environment and human body, and if can carry out the raffinate and draw the problem that can further promote its economic benefits of recovery.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a raffinate recovery unit is used in dimethyl formamide rectification, includes the stills, the upper surface of stills and the lower fixed surface of support are connected, the upper surface of support passes through the fixed surface of mounting bracket and motor to be connected, the output shaft of motor passes through the top fixed connection of shaft sleeve and (mixing) shaft, the surface of (mixing) shaft is through the upper surface of sealed rotating member joint at the stills inner wall, the upper surface of stills is linked together through the discharge gate of feed pipe and feed pump, the feed inlet of feed pump is linked together through the front of joint with the storage jar, the upper surface of stills is linked together with the air inlet of vacuum pump, the gas outlet of vacuum pump is linked together with the left surface of condensate pot, the inner wall joint of condensate pot has a plurality of spoilers, the both ends joint through two tube sockets and a plurality of heat exchange tube of condensate pot, the right flank of condensate tank welds with the left surface of installation cover, the last surface that the upper surface of installation cover passes through pipeline and gas port is linked together, the lower surface of installation cover is linked together through the top of pipeline with the liquid mouth, the equal joint in the upper surface of closing plate in the surface of gas port and liquid mouth, the lower surface of closing plate and the upper surface welding of knockout drum, the inner wall joint of knockout drum has the baffle, the lower surface of baffle and the surface joint of liquid mouth, the upper surface joint of closing plate has the backward flow mouth, the one end of backward flow mouth is linked together with the upper surface of stills inner wall.

As a further aspect of the present invention: and a pressure release valve is arranged on the surface of the reflux port, and the back surface of the separation tank is fixedly connected with the front surface of the mechanical drain valve.

As a further aspect of the present invention: the upper and lower two surfaces of condensing jar inner wall have all seted up the cooling mouth, stills's upper surface is provided with pan feeding mouth and a plurality of and assists the material mouth.

As a further aspect of the present invention: the connector is of a three-way structure, and a valve is arranged on the surface of the connector at one end of the front side.

As a further aspect of the present invention: the condensation jar inner wall joint has two sealing strips, the inner wall joint of installation cover has the separator plate, the separator plate specifically is the otter board.

(III) advantageous effects

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the residual liquid recovery device for the dimethyl formamide rectification is characterized in that a distillation still, a vacuum pump, a condensation tank, a separation plate, a heat exchange pipe, an installation cover, a gas port, a liquid port, a mechanical drain valve, a partition plate and a constant pressure pipe are arranged, when the recovery device is used, during the heating of residual liquid inside the distillation still, dimethyl formamide is evaporated into a gas state in the distillation still, is sucked into the condensation tank under the action of the vacuum pump, uniformly enters the installation cover through a plurality of heat exchange pipes, is cooled by a heat exchange medium in the condensation pipe, is condensed, is gathered below the inner wall of the installation cover and flows into the separation tank through the liquid port, residual gas flows into the separation tank through the gas port during the use, meanwhile, the condensed liquid directly flows into a sealed space below the partition plate, and the gas enters a sealed space above the partition plate, the surplus gas continuously appears in the below that flows into the baffle through mechanical trap in a small amount of condensation immediately, and unnecessary gas enters into the stills through the backward flow mouth simultaneously and circulates, and this kind of mode can keep the effect of carrying out further extraction in the raffinate of good dimethylformamide when using, adopts the mode of cycle work to ensure the raffinate recovery effect of maximize.

2. This dimethyl formamide is raffinate recovery unit for rectification, through setting up the motor, the (mixing) shaft, the storage jar, the feed pump, feed pipe and joint, when using, through opening the positive one end valve of joint and keep closing the feed pump, at first store the raffinate of processing in the storage jar immediately, when retrieving immediately, close the valve on interface surface, draw the raw materials through feed pump and interface immediately, make it send into the stills through the feed pipe pump in, the interior distilling in-process of stills simultaneously, the motor rotates through driving the (mixing) shaft, stir the raffinate of inside, this kind of mode can keep the storage to the raffinate when using, and integration feed mode, make its operating efficiency promote, under the stirring effect of cooperation (mixing) shaft and motor, make its speed and the effect that promotes the evaporation.

3. This raffinate recovery unit is used in dimethyl formamide rectification, through setting up the mouth that converges, constant voltage pipe and relief valve, when the mouth that converges is leading-in when the stills is inside with unnecessary gas through the constant voltage pipe, along with gaseous flow, inside is the negative pressure state, when the inside negative pressure state of stills is in certain vacuum state, the relief valve keeps the intercommunication of constant voltage pipe, this kind of mode can ensure that the stills is in stable constant voltage state, cooperate mechanical trap simultaneously can be with unnecessary gaseous discharge, steam and ponding keep the state of reserving.

Drawings

Fig. 1 is a schematic three-dimensional structure of the present invention;

FIG. 2 is a schematic diagram of the explosion structure of the condensing tank of the present invention;

FIG. 3 is a schematic view of the three-dimensional cross-sectional structure of the separation tube of the present invention;

in the figure: the device comprises a distillation still 1, a support 2, a mounting frame 3, a motor 4, a stirring shaft 5, a feeding pipe 6, a feeding pump 7, a joint 8, a storage tank 9, a vacuum pump 10, a condensing tank 11, a spoiler 12, a heat exchange pipe 13, a mounting cover 14, a separating plate 15, a gas port 16, a liquid port 17, a reflux port 18, a separating tank 19, a sealing plate 20, a separating plate 21, a mechanical drain valve 22, a pressure relief valve 23 and a constant pressure pipe 24.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

As shown in fig. 1-3, the utility model provides a technical solution: a residual liquid recovery device for dimethylformamide rectification comprises a distillation kettle 1, wherein the upper surface of the distillation kettle 1 is fixedly connected with the lower surface of a support 2, the upper surface of the support 2 is fixedly connected with the surface of a motor 4 through an installation frame 3, an output shaft of the motor 4 is fixedly connected with the top end of a stirring shaft 5 through a coupling sleeve, the surface of the stirring shaft 5 is clamped on the upper surface of the inner wall of the distillation kettle 1 through a sealing rotating piece, the upper surface of the distillation kettle 1 is communicated with a discharge hole of a feed pump 7 through a feed pipe 6, a feed port of the feed pump 7 is communicated with the front surface of a storage tank 9 through a joint 8, the upper surface of the distillation kettle 1 is communicated with an air inlet 16 of a vacuum pump 10, an air outlet 16 of the vacuum pump 10 is communicated with the left side surface of a condensation tank 11, a plurality of spoilers 12 are clamped on the inner wall of the condensation tank 11, and the two ends of the condensation tank 11 are clamped with a plurality of heat exchange pipes 13 through two pipe seats, the right flank of condensate tank 11 and the left flank welding of installation cover 14, the last surface that appears through pipeline and gas port 16 of installation cover 14 is linked together, the lower surface of installation cover 14 is linked together through the top of pipeline with liquid mouth 17, the equal joint in the upper surface of closing plate 20 in gas port 16 and liquid mouth 17's surface, the lower surface of closing plate 20 and the upper surface welding of knockout drum 19, the inner wall joint of knockout drum 19 has baffle 21, the lower surface of baffle 21 and the surface joint of liquid mouth 17, the upper surface joint of closing plate 20 has backward flow mouth 18, the one end of backward flow mouth 18 is linked together with the upper surface of stills 1 inner wall.

Specifically, as shown in fig. 1, a pressure release valve 23 is arranged on the surface of the return port 18, the back of the separation tank 19 is fixedly connected with the front of the mechanical trap 22, the joint 8 is specifically of a three-way structure, a valve is arranged on the interface surface of one end of the front, by arranging the pressure release valve 23, the pressure release valve 23 can control the internal gas flow state, so that the gas flow state can be adjusted to a certain pressure state, by arranging the mechanical trap 22, the mechanical trap 22 can keep a good steam and condensate water processing effect, and meanwhile, a good air exhaust effect can be kept, by arranging the joint 8, the joint 8 can keep a good connection effect.

Specifically, as shown in fig. 2, the cooling hole has all been seted up on the upper and lower two surfaces of condensate tank 11 inner wall, stills 1's upper surface is provided with pan feeding mouth and a plurality of and assists the material mouth, 11 inner wall joints of condensate tank have two sealing strips, the inner wall joints of installation cover 14 have separator plate 15, separator plate 15 specifically is the otter board, through setting up the cooling hole, the cooling hole can keep invariable cooling effect to inside, through setting up assisting the material mouth, the auxiliary material mouth can conveniently carry out fixed erection joint, carry out stable feed effect, through setting up separator plate 15, separator plate 15 can keep good steam and comdenstion water to carry out the separating action.

The utility model discloses a theory of operation does:

s1, when in use, the valve at the end of the front face of the joint 8 is opened and the feed pump 7 is kept closed, then the processed residual liquid is firstly stored in the storage tank 9, when in recovery, the valve on the surface of the joint is closed, and then the raw material is pumped into the distillation kettle 1 through the feed pump 7 and the joint and is pumped into the distillation kettle through the feed pipe 6;

s2, simultaneously, in the distillation process of the distillation kettle 1, the motor 4 drives the stirring shaft 5 to rotate, the residual liquid inside is stirred, the dimethyl formamide is evaporated into a gas state in the distillation kettle 1 along with the heating of the residual liquid inside by the distillation kettle 1, the gas state is pumped into the condensation tank 11 under the action of the vacuum pump 10, the gas uniformly enters the installation cover 14 through a plurality of heat exchange pipes 13, the evaporated gas is condensed under the cooling of a heat exchange medium in the condensation pipe and flows into the separation tank 19 through the liquid port 17 under the inner wall of the installation cover 14, and the residual gas flows into the separation tank 19 through the gas port 16 when the gas condensation tank is used;

s3, the liquid after condensation flows directly into the sealed space below the partition plate 21, the gas enters the sealed space above the partition plate 21, then the redundant gas continuously flows into the space below the partition plate 21 through the mechanical drain valve 22 during a small amount of condensation, and simultaneously the redundant gas enters the distillation kettle 1 through the return port 18 for circulation.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. The utility model provides a raffinate recovery unit is used in dimethylformamide rectification, includes stills (1), its characterized in that: the upper surface of the distillation kettle (1) is fixedly connected with the lower surface of the support (2), the upper surface of the support (2) is fixedly connected with the surface of the motor (4) through the mounting frame (3), the output shaft of the motor (4) is fixedly connected with the top end of the stirring shaft (5) through the coupling sleeve, the surface of the stirring shaft (5) is clamped on the upper surface of the inner wall of the distillation kettle (1) through the sealing rotating piece, the upper surface of the distillation kettle (1) is communicated with the discharge hole of the feeding pump (7) through the feeding pipe (6), the feed hole of the feeding pump (7) is communicated with the front surface of the storage tank (9) through the joint (8), the upper surface of the distillation kettle (1) is communicated with the air inlet (16) of the vacuum pump (10), the air outlet (16) of the vacuum pump (10) is communicated with the left side surface of the condensation tank (11), the inner wall of the condensation tank (11) is clamped with a plurality of spoilers (12), the condensing tank (11) is clamped with the two ends of a plurality of heat exchange tubes (13) through two tube seats, the right side surface of the condensation tank (11) is welded with the left side surface of the mounting cover (14), the upper surface of the mounting cover (14) is communicated with the upper surface of the air port (16) through a pipeline, the lower surface of the mounting cover (14) is communicated with the top end of the liquid port (17) through a pipeline, the surfaces of the air port (16) and the liquid port (17) are clamped on the upper surface of the sealing plate (20), the lower surface of the sealing plate (20) is welded with the upper surface of the separating tank (19), a partition plate (21) is clamped on the inner wall of the separation tank (19), the lower surface of the partition plate (21) is clamped with the surface of the liquid port (17), the upper surface of the sealing plate (20) is connected with a backflow port (18) in a clamping mode, and one end of the backflow port (18) is communicated with the upper surface of the inner wall of the distillation kettle (1).

2. The apparatus for recovering a residue for the rectification of dimethylformamide as claimed in claim 1, wherein: the surface of the backflow port (18) is provided with a pressure release valve (23), and the back of the separation tank (19) is fixedly connected with the front of the mechanical drain valve (22).

3. The apparatus for recovering a residue for the rectification of dimethylformamide as claimed in claim 1, wherein: the upper and lower two surfaces of condensation jar (11) inner wall have all seted up the cooling mouth, the upper surface of stills (1) is provided with pan feeding mouth and a plurality of and assists the material mouth.

4. The apparatus for recovering a residue for the rectification of dimethylformamide as claimed in claim 1, wherein: the joint (8) is of a three-way structure, and a valve is arranged on the surface of the joint at one end of the front face.

5. The apparatus for recovering a residue for the rectification of dimethylformamide as claimed in claim 1, wherein: the inner wall joint of condensation jar (11) has two sealing strips, the inner wall joint of installation cover (14) has separation plate (15), separation plate (15) specifically are the otter board.