CN114130048A - Acid corrosion prevention device and method for rectifying methanol dehydration high-pressure tower of CTEG device - Google Patents
Acid corrosion prevention device and method for rectifying methanol dehydration high-pressure tower of CTEG device Download PDFInfo
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- CN114130048A CN114130048A CN202111230623.4A CN202111230623A CN114130048A CN 114130048 A CN114130048 A CN 114130048A CN 202111230623 A CN202111230623 A CN 202111230623A CN 114130048 A CN114130048 A CN 114130048A
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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
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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
- B01D3/42—Regulation; Control
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
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Abstract
The invention provides an acid corrosion prevention device and method for rectifying methanol dehydration high-pressure tower of a CTEG device, and relates to the technical field of methanol dehydration. The device comprises an alkali feeding pipeline which is communicated with an outlet pipeline of a tower kettle pump of the normal-pressure methanol dehydration tower. Neutralizing acidic substances in the feeding material of a rectifying device of the high-pressure methanol dehydrating tower to generate neutral substances without corrosion, controlling the rectification PH of the high-pressure methanol dehydrating tower, preventing the high-pressure methanol dehydrating tower from being corroded, and protecting high-pressure tower equipment; and light components such as organic acid, ester and the like are removed through alkali addition reaction, so that the quality of refined methanol is improved, and the difficulty of wastewater treatment is reduced.
Description
Technical Field
The invention relates to the technical field of methanol dehydration, in particular to an acid corrosion prevention device and method for rectifying methanol dehydration high-pressure tower of a CTEG device.
Background
The methanol dehydration device mainly comprises three rectifying towers: an atmospheric methanol dehydration tower, a high-pressure methanol dehydration tower and an MF separation tower. The methanol dehydration process mainly has the function of recovering methanol in the alcohol-containing waste liquid for recycling for a system. The raw material of the methanol dehydration step is an alcohol-containing waste liquid from a methanol dehydration feed tank, and the alcohol-containing waste liquid mainly contains 60% of water, 39% of methanol, trace nitric acid and organic acid.
The alcohol-containing waste liquid is sent to the middle part of an atmospheric methanol dehydration tower through a methanol dehydration feeding pump for feeding, light components at the top of the atmospheric methanol dehydration tower mainly contain 98 percent of methanol and 1.5 percent of methyl formate, the light components are extracted through a reflux pump of the atmospheric tower and sent to an MF separation tower, and the methanol and the MF waste liquid are separated and recovered in the MF separation tower; the temperature of the tower kettle of the normal pressure methanol dehydration tower is 68 ℃, and the alcohol-containing waste liquid in the tower kettle is pumped to the high pressure methanol dehydration tower through the tower kettle. The waste liquid containing alcohol with lower methanol content is rectified in a high-pressure methanol dehydration tower, the temperature of the tower bottom is about 120 ℃, methanol is separated and recovered from the tower top, and the waste water in the tower bottom is sent to sewage treatment.
The raw material of the methanol dehydration device is alcohol-containing waste water, and the alcohol-containing waste liquid contains organic acids such as nitric acid, formic acid and the like. The methanol dehydration tower needs to be considered to prevent acid corrosion normally during model selection, the corrosion is little basically at the tower kettle temperature of 68 ℃ in the normal pressure methanol dehydration tower, but the corrosion of the internal parts, the tower tray and the tower body of the rectification tower is easily caused at the tower kettle temperature of the high pressure methanol dehydration tower of about 120 ℃, so that the safety risk of the production device is greatly increased, and the economic loss of long-term production halt is greatly reduced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an acid corrosion prevention device and method for rectifying methanol dehydration high-pressure tower of CTEG device, which solves the technical problem that the high-pressure methanol dehydration tower is easy to corrode.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
an acid corrosion prevention device for rectifying methanol dehydration high-pressure tower of CTEG device comprises: and the alkali feeding pipeline is communicated with an outlet pipeline of the tower kettle of the normal-pressure methanol dehydrating tower.
Preferably, the acid corrosion prevention device further comprises a metering pump, and the metering pump is installed on the alkali feeding pipeline.
Preferably, the acid corrosion prevention device further comprises a static mixer, and the static mixer is installed on an intersection pipeline of the alkali feed pipeline and the pump outlet pipeline of the tower kettle of the atmospheric methanol dehydration tower.
Preferably, the acid corrosion prevention device further comprises a first PH meter, and the first PH meter is mounted on a return line of an outlet pipeline of the tower kettle of the atmospheric methanol dehydration tower.
Preferably, the acid corrosion prevention device further comprises a second PH meter, wherein the second PH meter is installed on a pipeline communicated with the high-pressure methanol dehydration tower through the static mixer;
and/or the acid corrosion prevention device further comprises a third PH meter, and the third PH meter is installed on a wastewater pipeline of the tower kettle of the high-pressure methanol dehydration tower.
An acid corrosion prevention method for rectifying methanol dehydration high-pressure tower of CTEG device comprises the following steps:
s1, configuring an alkali feeding pipeline to an outlet pipeline of a pump of a tower kettle of the normal-pressure methanol dehydrating tower;
s2, adding the alkali liquor into the high-pressure methanol dehydration tower through the alkali feed pipeline.
Preferably, the alkali feed line is fitted with a metering pump.
Preferably, a static mixer is arranged on a junction pipeline of the alkali feeding pipeline and the pump outlet pipeline of the tower kettle of the normal-pressure methanol dehydrating tower.
Preferably, a first PH meter is arranged on a return pipeline of an outlet pipeline of the tower kettle of the normal-pressure methanol dehydrating tower;
and/or a second PH meter is arranged on a pipeline communicated with the high-pressure methanol dehydration tower by the static mixer;
and/or a third PH meter is arranged on the high-pressure methanol dehydration tower kettle waste water pipeline.
Preferably, the method further comprises:
and S3, adjusting the alkali adding amount in the step S2 according to the pH value of the first pH meter, the second pH meter or the third pH meter, and maintaining the pH value of the tower kettle pump of the atmospheric methanol dehydration tower at 6.5-9.
(III) advantageous effects
The invention provides an acid corrosion prevention device and method for rectifying methanol dehydration high-pressure tower of CTEG device. Compared with the prior art, the method has the following beneficial effects:
the device comprises an alkali feeding pipeline which is communicated with an outlet pipeline of a tower kettle pump of the normal-pressure methanol dehydration tower. Neutralizing acidic substances in the feeding material of a rectifying device of the high-pressure methanol dehydrating tower to generate neutral substances without corrosion, controlling the rectification PH of the high-pressure methanol dehydrating tower, preventing the high-pressure methanol dehydrating tower from being corroded, and protecting high-pressure tower equipment; and light components such as organic acid, ester and the like are removed through alkali addition reaction, so that the quality of refined methanol is improved, and the difficulty of wastewater treatment is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an acid corrosion prevention device for rectifying methanol dehydration high-pressure column of a CTEG device according to an embodiment of the invention;
FIG. 2 is a schematic flow chart of an acid corrosion prevention method for rectifying methanol dehydration high-pressure column of CTEG device according to the embodiment of the invention.
Wherein, 1 alkali feed line, 2 metering pumps, 3 static mixers, 4 first PH meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but 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.
The embodiment of the application solves the technical problem that a high-pressure methanol dehydration tower is easy to corrode by providing the acid corrosion prevention device and the method for rectifying the methanol dehydration high-pressure tower of the CTEG device, and realizes the protection of high-pressure tower equipment.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the embodiment of the invention comprises an alkali feeding pipeline which is communicated with an outlet pipeline of a kettle pump of the normal-pressure methanol dehydrating tower. Neutralizing acidic substances in the feeding material of a rectifying device of the high-pressure methanol dehydrating tower to generate neutral substances without corrosion, controlling the rectification PH of the high-pressure methanol dehydrating tower, preventing the high-pressure methanol dehydrating tower from being corroded, and protecting high-pressure tower equipment; and light components such as organic acid, ester and the like are removed through alkali addition reaction, so that the quality of refined methanol is improved, and the difficulty of wastewater treatment is reduced.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1:
as shown in fig. 1, an embodiment of the present invention provides an acid corrosion prevention device for rectification of a methanol dehydration high-pressure column of a CTEG plant, comprising: an alkali feed line 1, a metering pump 2, a static mixer 3 and a first PH meter 4.
And the alkali feed pipeline 1 is communicated with an outlet pipeline of a tower kettle pump of the normal-pressure methanol dehydrating tower. Wherein the alkali feed can be 32 percent sodium hydroxide solution by mass fraction; the alkali feed line material is 304L stainless steel pipe, and the pipe diameter can be selected from DN 25.
The metering pump 2 comprises two metering pumps which are arranged on the alkali feeding pipeline 1 in parallel. When the device breaks down, normal use is not influenced by starting the standby pump. The maximum flow of the metering pump 2 is 0.5m3/h。
The static mixer 3 is arranged on a junction pipeline of the alkali feeding pipeline 1 and an outlet pipeline of a tower kettle of the normal-pressure methanol dehydrating tower. Static mixer 3 is used for the intensive mixing alkali feeding and the alcohol-containing waste liquid of ordinary pressure methanol dehydration tower cauldron, and the condition of corruption appears in high pressure methanol dehydration tower rectification PH is prevented to the strict control high pressure methanol dehydration tower, protects high pressure column equipment.
As shown in fig. 1, the first PH meter 4 is installed on a return line of a pump outlet line of a tower kettle of an atmospheric methanol dehydration tower, the first PH meter 4 is an online PH meter, the material is stainless steel 304L, and the measurement range is 0-14.
After a first PF meter 4 detects the PH value of alcohol-containing waste liquid in the tower kettle of the normal-pressure methanol dehydration tower, the part of the waste liquid can flow back to the inlet of a pump of the tower kettle of the normal-pressure methanol dehydration tower.
Particularly, the acid corrosion prevention device provided by the invention further comprises a second pH meter and a third pH meter. The second PH meter is installed on a line (not shown) connecting the static mixer 3 with the high pressure methanol dehydration tower; the third PH meter is arranged on a waste water pipeline (not shown in the figure) of the tower kettle of the high-pressure methanol dehydration tower. The second PH meter and the third PH meter are both online PH meters. Through three online pH meters, the pH value of each material of the methanol dehydration device can be comprehensively controlled, multi-point detection is implemented, and regulation and control are timely and accurately performed.
Example 2:
as shown in fig. 2, an embodiment of the present invention provides an acid corrosion prevention method for rectification of a methanol dehydration high-pressure column of a CTEG plant, including:
s1, configuring an alkali feed pipeline 1 to an outlet pipeline of a tower kettle pump of the normal-pressure methanol dehydration tower;
s2, adding alkali liquor into the high-pressure methanol dehydration tower through the alkali feed pipeline 1;
in particular, the material of the alkali feed line is 304L stainless steel pipe, and the pipe diameter can be selected from DN 25.
The alkali feed line 1 is equipped with a metering pump 2. The metering pump 2 comprises two metering pumps which are arranged on the alkali feeding pipeline 1 in parallel. When the device breaks down, normal use is not influenced by starting the standby pump. The maximum flow of the metering pump 2 is 0.5m3/h。
And a static mixer 3 is arranged on a crossed pipeline of the alkali feeding pipeline 1 and an outlet pipeline of the tower kettle of the normal-pressure methanol dehydrating tower. The static mixer 3 is arranged on a junction pipeline of the alkali feeding pipeline 1 and an outlet pipeline of a tower kettle of the normal-pressure methanol dehydrating tower. Static mixer 3 is used for the intensive mixing alkali feeding and the alcohol-containing waste liquid of ordinary pressure methanol dehydration tower cauldron, and the condition of corruption appears in high pressure methanol dehydration tower rectification PH is prevented to the strict control high pressure methanol dehydration tower, protects high pressure column equipment.
A first PH meter 4 is arranged on a return pipeline of an outlet pipeline of the tower kettle of the normal-pressure methanol dehydrating tower; a second PH meter is arranged on a pipeline communicated with the static mixer 3 and the high-pressure methanol dehydration tower; and a third PH meter is arranged on the wastewater pipeline of the tower kettle of the high-pressure methanol dehydration tower. The first PH meter, the second PH meter and the third PH meter are all online PH meters. Through three online pH meters, the pH value of each material of the methanol dehydration device can be comprehensively controlled, multi-point detection is implemented, and regulation and control are timely and accurately performed.
Correspondingly, the acid corrosion prevention method provided by the embodiment of the invention further comprises the following steps:
and S3, adjusting the alkali adding amount in the step S2 according to the pH value of the first pH meter 4, the second pH meter or the third pH meter, and maintaining the pH value of the kettle pump of the atmospheric methanol dehydration tower at 6.5-9.
In summary, compared with the prior art, the method has the following beneficial effects:
the embodiment of the invention comprises an alkali feeding pipeline which is communicated with an outlet pipeline of a kettle pump of the normal-pressure methanol dehydrating tower. Neutralizing acidic substances in the feeding material of a rectifying device of the high-pressure methanol dehydrating tower to generate neutral substances without corrosion, controlling the rectification PH of the high-pressure methanol dehydrating tower, preventing the high-pressure methanol dehydrating tower from being corroded, and protecting high-pressure tower equipment; and light components such as organic acid, ester and the like are removed through alkali addition reaction, so that the quality of refined methanol is improved, and the difficulty of wastewater treatment is reduced.
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, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a prevent acid corrosion device that is used for rectification of CTEG device methyl alcohol dehydration high-pressure column which characterized in that includes: the alkali feed pipeline (1) is communicated with an outlet pipeline of a tower kettle pump of the normal-pressure methanol dehydration tower.
2. The acid corrosion prevention device according to claim 1, further comprising a metering pump (2), wherein the metering pump (2) is installed on the alkali feed line (1).
3. The acid corrosion prevention apparatus according to claim 1, further comprising a static mixer (3), wherein the static mixer (3) is installed on an intersection line of the alkali feed line (1) and the atmospheric methanol dehydration column tank pump outlet line.
4. The acid corrosion preventing apparatus according to claim 1, further comprising a first PH meter (4), wherein the first PH meter (4) is installed on a return line of a pump outlet line of a tower pot of the atmospheric methanol dehydration tower.
5. The acid corrosion prevention apparatus of claim 4,
the acid corrosion prevention device also comprises a second PH meter, and the second PH meter is arranged on a pipeline communicated with the static mixer (3) and the high-pressure methanol dehydration tower;
and/or the acid corrosion prevention device further comprises a third PH meter, and the third PH meter is installed on a wastewater pipeline of the tower kettle of the high-pressure methanol dehydration tower.
6. An acid corrosion prevention method for rectifying methanol dehydration high-pressure tower of CTEG device is characterized by comprising the following steps:
s1, arranging an alkali feeding pipeline (1) to an outlet pipeline of a tower kettle pump of the normal pressure methanol dehydrating tower;
s2, adding the alkali liquor into the high-pressure methanol dehydration tower through the alkali feed pipeline (1).
7. The method for protection against acid corrosion according to claim 6, characterized in that the alkali feed line (1) is fitted with a metering pump (2).
8. The method for preventing acid corrosion according to claim 6, wherein a static mixer (3) is installed on a junction line of the alkali feed line (1) and the pump outlet line of the atmospheric methanol dehydration column bottom.
9. The method of preventing acid corrosion according to claim 6,
a first PH meter (4) is arranged on a return pipeline of an outlet pipeline of the tower kettle of the normal-pressure methanol dehydrating tower;
and/or a second PH meter is arranged on a pipeline communicated with the high-pressure methanol dehydration tower by the static mixer (3);
and/or a third PH meter is arranged on the high-pressure methanol dehydration tower kettle waste water pipeline.
10. The method of preventing acid corrosion according to claim 9, further comprising:
and S3, adjusting the alkali adding amount in the step S2 according to the PH detection value of the first PH meter (4), the second PH meter or the third PH meter, and maintaining the PH value of the kettle pump of the normal pressure methanol dehydration tower at 6.5-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114660159A (en) * | 2022-03-21 | 2022-06-24 | 中国石油化工股份有限公司 | Method for retarding corrosion of rectification system of vinyl acetate device |
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