CN111467827A - Automatic drainage device of electronic grade N-methylformamide negative pressure rectifying tower - Google Patents
Automatic drainage device of electronic grade N-methylformamide negative pressure rectifying tower Download PDFInfo
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- CN111467827A CN111467827A CN202010174707.XA CN202010174707A CN111467827A CN 111467827 A CN111467827 A CN 111467827A CN 202010174707 A CN202010174707 A CN 202010174707A CN 111467827 A CN111467827 A CN 111467827A
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- Prior art keywords
- liquid
- valve
- rectifying tower
- liquid discharge
- negative pressure
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- ATHHXGZTWNVVOU-UHFFFAOYSA-N N-methylformamide Chemical compound CNC=O ATHHXGZTWNVVOU-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 129
- 238000003860 storage Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims description 9
- 238000005457 optimization Methods 0.000 description 9
- 238000007599 discharging Methods 0.000 description 3
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/22—Separation; Purification; Stabilisation; Use of additives
- C07C231/24—Separation; Purification
Abstract
An automatic liquid discharge device of an electronic grade N-methylformamide negative pressure rectifying tower comprises a kettle liquid storage tank, wherein the upper part of the kettle liquid storage tank is provided with a liquid inlet, a vacuum gas phase balance port, an air inlet and a liquid discharge port, the liquid inlet is connected with the rectifying tower through a rectifying tower kettle liquid outlet pipe, the vacuum gas phase balance port is connected with a vacuum system through a gas phase pipeline, and the air inlet is communicated with the outside air through an air inlet pipe; the lower part of the kettle liquid storage tank is connected with the kettle liquid groove through a liquid discharge pipe; electric remote control valves are arranged on the liquid outlet pipe, the gas phase pipeline, the gas inlet pipe and the liquid discharge pipe of the rectifying tower; the invention can realize that the kettle liquid in the rectifying tower is automatically discharged into the kettle liquid tank under negative pressure, has simple operation and improves the working efficiency.
Description
Technical Field
The invention relates to the technical field of N-methylformamide production equipment, in particular to an automatic liquid discharge device of an electronic grade N-methylformamide negative pressure rectifying tower.
Background
The industrial electronic grade methyl N-methyl formamide is synthesized by reacting monomethylamine with methyl formate, qualified products are obtained from the top of a rectifying tower after 3 steps of rough distillation, lightness removal and rectification of materials after reaction, tower bottoms are discharged to a tank of the rectifying tower, but the condition that the tower bottoms in the existing rectifying tower cannot be normally discharged occurs, and the subsequent operation is influenced.
Disclosure of Invention
Technical problem to be solved
The invention provides an automatic liquid discharge device of an electronic grade N-methylformamide negative pressure rectifying tower, which can realize that kettle liquid in the rectifying tower is automatically discharged into a kettle liquid tank, is simple to operate and improves the working efficiency.
(II) the adopted technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: an automatic liquid discharge device of an electronic grade N-methylformamide negative pressure rectifying tower comprises a kettle liquid storage tank, wherein the upper part of the kettle liquid storage tank is provided with a liquid inlet, a vacuum gas phase balance port and an air inlet, the liquid inlet is connected with the rectifying tower through a rectifying tower liquid outlet pipe, the vacuum gas phase balance port is connected with a vacuum system through a gas phase pipeline, and the air inlet is communicated with the outside air through an air inlet pipe; the lower part of the kettle liquid storage tank is connected with the kettle liquid groove through a liquid discharge pipe; and electric remote control valves are arranged on the liquid outlet pipe of the rectifying tower, the gas phase pipeline, the gas inlet pipe and the liquid discharge pipe.
As a further optimization of the scheme, the valve on the liquid outlet pipe of the rectifying tower is a liquid discharge valve (negative pressure).
As a further optimization of the scheme, the valve on the gas phase pipeline is a gas phase balance valve.
As a further optimization of the scheme, the valve on the air inlet pipe is an emptying valve.
As a further optimization of the scheme, the valve on the liquid discharge pipe is a liquid discharge valve (normal pressure).
As a further optimization of the scheme, the automatic liquid drainage working process comprises the following steps of (1) liquid drainage: the gas phase balance valve and the liquid discharge valve (negative pressure) are in an open state, the emptying valve and the liquid discharge valve (normal pressure) are in a closed state, and kettle liquid in the rectifying tower enters the kettle liquid storage tank under the negative pressure condition; (2) after liquid drainage: the gas phase balance valve and the liquid discharge valve (negative pressure) are in a closed state, the emptying valve and the liquid discharge valve (normal pressure) are in an open state, air enters the kettle liquid storage tank, and normal pressure is formed in the kettle liquid storage tank, so that kettle liquid in the kettle liquid storage tank automatically flows into the kettle liquid groove.
(III) advantageous effects
The invention provides an automatic liquid discharge device of an electronic grade N-methylformamide negative pressure rectifying tower, which has the following beneficial effects:
according to the invention, a gas phase balance valve, a liquid discharge valve (negative pressure), an emptying valve and a liquid discharge valve (normal pressure) are arranged, the gas phase balance valve and the liquid discharge valve (negative pressure) are in an open state, the emptying valve and the liquid discharge valve (normal pressure) are in a closed state, and kettle liquid in a rectifying tower enters a kettle liquid storage tank under the negative pressure condition; when the gas phase balance valve and the liquid discharge valve (negative pressure) are in a closed state, the emptying valve and the liquid discharge valve (normal pressure) are in an open state, air enters the kettle liquid storage tank, so that the normal pressure is formed in the kettle liquid storage tank, and the kettle liquid in the kettle liquid storage tank automatically flows into a kettle liquid groove; the automatic liquid discharging device can realize automatic liquid discharging, avoid the situation of abnormal liquid discharging and improve the working efficiency.
Drawings
The invention is further illustrated below with reference to the accompanying drawings:
FIG. 1 is a schematic structural view of the present invention:
in the figure: 1. rectifying column, 2, reboiler, 3, rectifying column drain pipe, 4, flowing back valve (negative pressure), 5, intake pipe, 6, atmospheric valve, 7, cauldron liquid storage jar, 8, control system, 9, condenser, 10, gas phase pipeline, 11, gas phase balance valve, 12, flowing back pipe, 13, flowing back valve (ordinary pressure), 14, cauldron cistern.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the conventional rectification apparatus includes a rectification column 1, a reboiler 2, a condenser 9 and a control system 8, wherein the reboiler is used to partially vaporize the column bottoms and then feed the column bottoms back to the rectification column, the condenser is used to condense the overhead vapor into liquid, part of the condensed liquid is used as overhead product, i.e. qualified formamide product, and the rest is used as reflux liquid and returns to the top of the column.
An automatic liquid discharge device of an electronic grade N-methylformamide negative pressure rectifying tower comprises a kettle liquid storage tank 7, wherein the upper part of the kettle liquid storage tank is provided with a liquid inlet, a vacuum gas phase balance port and an air inlet, the liquid inlet is connected with the rectifying tower through a rectifying tower liquid outlet pipe 3, the vacuum gas phase balance port is connected with a vacuum system through a gas phase pipeline 10, and the air inlet is communicated with the outside air through an air inlet pipe 5; the lower part of the kettle liquid storage tank is connected with a kettle liquid tank 14 through a liquid discharge pipe 12; electric remote control valves are arranged on the liquid outlet pipe, the gas phase pipeline, the gas inlet pipe and the liquid discharge pipe of the rectifying tower; remote control or programmed control may be implemented.
As a further optimization of the scheme, the valve on the liquid outlet pipe of the rectifying tower is a liquid discharge valve (negative pressure) 4.
As a further optimization of the scheme, the valve on the gas phase pipeline is a gas phase balance valve 11.
As a further optimization of the scheme, the valve on the air inlet pipe is an emptying valve 6.
As a further optimization of the scheme, the valve on the liquid discharge pipe is a liquid discharge valve (normal pressure).
The automatic liquid drainage working process of the invention comprises (1) liquid drainage: the gas phase balance valve and the liquid discharge valve (negative pressure) are in an open state, the emptying valve and the liquid discharge valve (normal pressure) are in a closed state, and kettle liquid in the rectifying tower enters the kettle liquid storage tank under the negative pressure condition; (2) after liquid drainage: the gas phase balance valve and the liquid discharge valve (negative pressure) are in a closed state, the emptying valve and the liquid discharge valve (normal pressure) are in an open state, air enters the kettle liquid storage tank, and normal pressure is formed in the kettle liquid storage tank, so that kettle liquid in the kettle liquid storage tank automatically flows into the kettle liquid groove.
It should be noted that, in this document, 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 (6)
1. An automatic liquid discharge device of an electronic grade N-methylformamide negative pressure rectifying tower is characterized by comprising a kettle liquid storage tank, wherein the upper part of the kettle liquid storage tank is provided with a liquid inlet, a vacuum gas phase balance port and an air inlet, the liquid inlet is connected with the rectifying tower through a rectifying tower liquid outlet pipe, the vacuum gas phase balance port is connected with a vacuum system through a gas phase pipeline, and the air inlet is communicated with the outside air through an air inlet pipe; the lower part of the kettle liquid storage tank is connected with the kettle liquid groove through a liquid discharge pipe; and electric remote control valves are arranged on the liquid outlet pipe of the rectifying tower, the gas phase pipeline, the gas inlet pipe and the liquid discharge pipe.
2. The automatic draining device of the electronic grade N-methylformamide negative pressure rectifying tower as claimed in claim 1, wherein the valve on the liquid outlet pipe of the rectifying tower is a draining valve (negative pressure).
3. The automatic liquid discharge device of the electronic-grade N-methylformamide negative pressure rectifying tower as claimed in claim 2, wherein the valve on the gas phase pipeline is a gas phase balance valve.
4. The automatic liquid discharge device of the electronic-grade N-methylformamide negative pressure rectifying tower as claimed in claim 3, wherein the valve on the gas inlet pipe is a blow valve.
5. The automatic liquid discharge device of the electronic-grade N-methylformamide negative pressure rectifying tower as claimed in claim 4, wherein the valve on the liquid discharge pipe is a liquid discharge valve (normal pressure).
6. The automatic liquid discharge device of the electronic grade N-methylformamide negative pressure rectifying tower of claim 5, wherein the automatic liquid discharge operation process comprises the following steps of (1) liquid discharge: the gas phase balance valve and the liquid discharge valve (negative pressure) are in an open state, the emptying valve and the liquid discharge valve (normal pressure) are in a closed state, and kettle liquid in the rectifying tower enters the kettle liquid storage tank under the negative pressure condition; (2) after liquid drainage: the gas phase balance valve and the liquid discharge valve (negative pressure) are in a closed state, the emptying valve and the liquid discharge valve (normal pressure) are in an open state, air enters the kettle liquid storage tank, and the normal pressure is formed in the kettle liquid storage tank, so that the kettle liquid in the kettle liquid storage tank automatically flows into the kettle liquid groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010174707.XA CN111467827A (en) | 2020-03-13 | 2020-03-13 | Automatic drainage device of electronic grade N-methylformamide negative pressure rectifying tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010174707.XA CN111467827A (en) | 2020-03-13 | 2020-03-13 | Automatic drainage device of electronic grade N-methylformamide negative pressure rectifying tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111467827A true CN111467827A (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010174707.XA Pending CN111467827A (en) | 2020-03-13 | 2020-03-13 | Automatic drainage device of electronic grade N-methylformamide negative pressure rectifying tower |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040220416A1 (en) * | 2002-09-26 | 2004-11-04 | Martin Emsenhuber | Process for the singlet oxygen oxidation of organic substrates |
| US20100063332A1 (en) * | 2008-09-05 | 2010-03-11 | Wei Ming Chang | Glycerol (Medical Grade) Preparation Method using a By-Product of a Bio-Diesel Process |
| CN105237428A (en) * | 2015-10-22 | 2016-01-13 | 宿迁新亚科技有限公司 | Formamide production technology for inhibiting generation of polymer |
| CN205035303U (en) * | 2015-10-12 | 2016-02-17 | 宿迁新亚科技有限公司 | Consecutive reaction device of N - methyl carboxamide |
| CN205035302U (en) * | 2015-12-23 | 2016-02-17 | 宿迁新亚科技有限公司 | A rectifying still fluid recovery unit that is arranged in synthetic technology of carboxamide |
| CN205886271U (en) * | 2016-06-08 | 2017-01-18 | 湖北汇达科技发展有限公司 | Automatic serialization methyl alcohol rectifier unit |
| CN107572157A (en) * | 2017-09-13 | 2018-01-12 | 江苏新凯晟机械设备有限公司 | Negative-pressure container pumping equipment |
-
2020
- 2020-03-13 CN CN202010174707.XA patent/CN111467827A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040220416A1 (en) * | 2002-09-26 | 2004-11-04 | Martin Emsenhuber | Process for the singlet oxygen oxidation of organic substrates |
| US20100063332A1 (en) * | 2008-09-05 | 2010-03-11 | Wei Ming Chang | Glycerol (Medical Grade) Preparation Method using a By-Product of a Bio-Diesel Process |
| CN205035303U (en) * | 2015-10-12 | 2016-02-17 | 宿迁新亚科技有限公司 | Consecutive reaction device of N - methyl carboxamide |
| CN105237428A (en) * | 2015-10-22 | 2016-01-13 | 宿迁新亚科技有限公司 | Formamide production technology for inhibiting generation of polymer |
| CN205035302U (en) * | 2015-12-23 | 2016-02-17 | 宿迁新亚科技有限公司 | A rectifying still fluid recovery unit that is arranged in synthetic technology of carboxamide |
| CN205886271U (en) * | 2016-06-08 | 2017-01-18 | 湖北汇达科技发展有限公司 | Automatic serialization methyl alcohol rectifier unit |
| CN107572157A (en) * | 2017-09-13 | 2018-01-12 | 江苏新凯晟机械设备有限公司 | Negative-pressure container pumping equipment |
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| PB01 | Publication | ||
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Application publication date: 20200731 |