CN115724489A - Device and method for treating residual liquid of methanol rectifying tower - Google Patents
Device and method for treating residual liquid of methanol rectifying tower Download PDFInfo
- Publication number
- CN115724489A CN115724489A CN202211441852.5A CN202211441852A CN115724489A CN 115724489 A CN115724489 A CN 115724489A CN 202211441852 A CN202211441852 A CN 202211441852A CN 115724489 A CN115724489 A CN 115724489A
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- China
- Prior art keywords
- tower
- raffinate
- residual liquid
- tank
- methanol
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 129
- 239000007788 liquid Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 11
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000000926 separation method Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 claims abstract description 17
- 239000010865 sewage Substances 0.000 claims abstract description 17
- 239000003513 alkali Substances 0.000 claims abstract description 16
- 239000000945 filler Substances 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 7
- 239000010935 stainless steel Substances 0.000 claims abstract description 7
- 238000012856 packing Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 230000003020 moisturizing effect Effects 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000000178 monomer Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000004821 distillation Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 abstract description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A methanol rectifying tower raffinate processing apparatus, including methanol rectifying tower, raffinate pump, heat exchanger, raffinate storage tank, export pump, raffinate knockout tower, lye tank, formaldehyde absorption tower moisturizing groove, burn burning furnace, effluent water sump, be equipped with the corrugated stainless steel packing in the raffinate knockout tower, the top is equipped with spray set in the raffinate knockout tower, the lye tank links to each other with spray set. The treatment method comprises the following steps: cooling the residual liquid to 40 ℃, injecting the residual liquid into a residual liquid separation tower for heating and distilling, adsorbing oily impurities in the residual liquid by using a filler, and feeding the tower bottom liquid into a water replenishing tank of a formaldehyde absorption tower; methanol steam is discharged from a gas outlet at the top of the methanol raffinate separation tower and is combusted in an incinerator; when the pressure difference at the bottom of the tower is larger than 55kPa, the filling is sprayed and washed by the alkali liquor, and the washed alkali liquor is sent to a sewage station for treatment. The invention can intensively treat the residual liquid of the methanol rectifying tower, separate the water in the residual liquid and use the residual liquid for the production of formaldehyde, thereby reducing the treatment capacity of a sewage station and saving water resources.
Description
Technical Field
The invention relates to a device and a method for treating residual liquid in a methanol rectifying tower.
Background
In the production of methanol, the rectification of crude methanol to concentrate refined methanol needs a step of normal pressure rectification, residual liquid at the bottom of a tower after the normal pressure rectification is generally directly sent to a sewage station for treatment and then discharged, the residual liquid is detected to contain about 99% of water, the residual 1% comprises various alcohols (methanol, ethanol, n-propanol and the like) and a very small amount of other organic matters, the residual liquid is sent to the sewage station for treatment and discharged, the treatment capacity of the sewage station is increased, and the waste of water resources is also caused.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a device for treating the residual liquid in the methanol rectifying tower, which can intensively treat the residual liquid in the methanol rectifying tower, separate water in the residual liquid and be used for producing formaldehyde, reduce the treatment capacity of a sewage station and save water resources.
The second technical problem to be solved by the invention is to provide the treatment method of the methanol rectification tower raffinate treatment device, which has simple steps and can remove organic matters in the methanol rectification tower raffinate and use the organic matters in the methanol rectification tower raffinate for formaldehyde production.
The invention provides a residual liquid treatment device of a methanol rectification tower, which comprises a methanol rectification tower, a residual liquid pump, a heat exchanger, a residual liquid storage tank, an outlet pump, a residual liquid separation tower, an alkali liquor tank, a formaldehyde absorption tower water replenishing tank, an incinerator and a sewage tank, wherein a residual liquid outlet at the lower side of the methanol rectification tower is connected with an inlet of the heat exchanger through the residual liquid pump, an outlet of the heat exchanger is connected with a feed inlet of the residual liquid storage tank, a discharge outlet of the residual liquid storage tank is connected with the lower part of the residual liquid separation tower through the outlet pump, differential pressure transmitters are arranged at the top and the bottom of the residual liquid separation tower, stainless steel corrugated packing is arranged at the middle part and the upper part of the residual liquid separation tower and is formed by laminating a plurality of monomers, each monomer is in a sheet corrugated shape, a gas outlet at the upper side of the residual liquid separation tower is connected with the incinerator, a first liquid discharge port and a second liquid discharge port are arranged at the lower side of the residual liquid separation tower, the first liquid discharge port is connected with the formaldehyde absorption tower water replenishing tank, the second residual liquid discharge port is connected with the sewage tank, a spray device is arranged at the top in the residual liquid separation tower, and the alkali liquor separation tower is connected with the spray device through a pipeline.
In order to solve the second technical problem, the invention provides a treatment method of a residual liquid treatment device of a methanol rectification tower, which comprises the following steps:
(1) Injecting the residual liquid in the methanol rectifying tower into an inlet of a heat exchanger through a residual liquid pump, and reducing the temperature of the residual liquid from 105 ℃ to 40 ℃ by the heat exchanger;
(2) Cooling the residual liquid and injecting into a residual liquid storage tank;
(3) Pumping residual liquid in the residual liquid storage tank into a residual liquid separation tower through an outlet pump for heating and distilling, wherein the distillation temperature is 65-70 ℃, a filler in the residual liquid separation tower adsorbs oily impurities in the residual liquid, and tower bottom liquid enters a water replenishing tank of a formaldehyde absorption tower through a first liquid discharge port;
(4) Conveying the tower bottom liquid in the water replenishing tank of the formaldehyde absorption tower to absorb formaldehyde and conveying the formaldehyde to a downward moving process of formaldehyde production;
(5) A small amount of methanol steam is discharged from a gas outlet at the top of the methanol raffinate separation tower and is combusted in an incinerator;
(6) After a period of time, detecting the pressure difference between the top and the bottom of the residual liquid separation tower through a differential pressure transmitter arranged at the top and the bottom of the residual liquid separation tower, stopping pumping by an outlet pump when the pressure difference is larger than 55kPa, injecting sodium hydroxide alkali liquor in an alkali liquor tank into a spraying device, wherein the pH value of the sodium hydroxide alkali liquor is larger than 9, spraying and washing filler in the residual liquid separation tower, and delivering the washed alkali liquor into a sewage tank through a second liquid outlet and then delivering the sewage tank to a sewage station for treatment.
The invention has the advantages that: the invention can intensively treat the residual liquid of the methanol rectifying tower, separate water in the residual liquid and be used for producing formaldehyde (the production lines of the methanol and the formaldehyde commonly exist, namely, a factory for producing the methanol also synchronously produces the formaldehyde), reduces the treatment amount of a sewage station and saves water resources. The residual liquid storage tank is used for temporarily storing residual liquid, plays a role in buffering, and prevents the influence on water replenishing of the formaldehyde absorption tower when no residual liquid is generated in the methanol rectification system. The absorption effect of the filler can be kept by spraying and washing the filler with alkali liquor.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
Referring to fig. 1, a methanol rectification tower 1 raffinate treatment device, including methanol rectification tower 1, raffinate pump 11, heat exchanger 2 (heat exchanger 2 adopts evaporative condenser), raffinate storage tank 3, outlet pump 31, raffinate knockout tower 4, lye tank 6, formaldehyde absorption tower moisturizing tank 7, burn burning furnace 5, effluent water sump 8, the lower side raffinate export of methanol rectification tower 1 link to each other with heat exchanger 2 import through raffinate pump 11, heat exchanger 2 export links to each other with raffinate storage tank 3 feed inlet, the raffinate storage tank 3 discharge gate links to each other with raffinate knockout tower 4 lower part through outlet pump 31, raffinate knockout tower 4 top and bottom are equipped with differential pressure transmitter (differential pressure transmitter is not shown in the figure), the middle part and upper portion of raffinate knockout tower 4 are equipped with stainless steel ripple packing 41, stainless steel ripple packing 41 form by a plurality of monomer range upon range, each monomer is the corrugated form of slice (stainless steel ripple packing is the product of purchasing outside, belong to the mature product in the field, do not do detailed description once more of raffinate knockout tower 4 upside gas outlet with burn burning furnace 5, the lower side of raffinate knockout tower 4 is equipped with first drain and second drain, the first drain is equipped with replenishing water tank 7 and continuous with formaldehyde absorption tower internal water tank 42, the makeup water tank 8 and spray the drain tank and spray the device of the raffinate knockout tower 4.
A treatment method of a residual liquid treatment device of a methanol rectifying tower 1 comprises the following steps:
(1) Injecting the residual liquid in the methanol rectifying tower 1 into an inlet of a heat exchanger 2 through a residual liquid pump 11, and reducing the temperature of the residual liquid from 105 ℃ to 40 ℃ by the heat exchanger 2;
(2) Cooling the raffinate, and injecting the cooled raffinate into a raffinate storage tank 3;
(3) Pumping residual liquid in the residual liquid storage tank 3 into a residual liquid separation tower 4 through an outlet pump 31 for heating and distilling, wherein the distillation temperature is 65-70 ℃, a filler 41 in the residual liquid separation tower 4 adsorbs oily impurities (the oily impurities are mainly methanol oil), and tower bottom liquid enters a water replenishing tank 7 of a formaldehyde absorption tower through a first liquid discharge port;
(4) The tower bottom liquid in the water replenishing tank 7 of the formaldehyde absorption tower is conveyed to the formaldehyde absorption tower to absorb formaldehyde and is conveyed to a downward moving process of formaldehyde production;
(5) A small amount of methanol steam is discharged from a gas outlet at the top of the methanol raffinate separation tower 4 and is combusted by an incinerator 5;
(6) After a period of time, the pressure difference between the top and the bottom of the residual liquid separation tower 4 is detected by a differential pressure transmitter arranged at the top and the bottom of the tower, when the pressure difference is larger than 55kPa, the outlet pump 31 stops pumping, the alkali liquor tank 6 injects sodium hydroxide alkali liquor into the spraying device 42, the filling 41 in the residual liquid separation tower 4 is sprayed and washed, the pH value of the sodium hydroxide solution is larger than 9, and the washed alkali liquor enters the sewage tank 8 through a second liquid outlet and then is sent to a sewage station for treatment.
Claims (2)
1. The utility model provides a methyl alcohol rectifying column raffinate processing apparatus which characterized in that: including methyl alcohol rectifying column, raffinate pump, heat exchanger, raffinate storage tank, export pump, raffinate knockout tower, lye tank, formaldehyde absorption tower moisturizing groove, burn burning furnace, effluent water sump, methyl alcohol rectifying column downside raffinate export link to each other with the heat exchanger import through the raffinate pump, the heat exchanger export links to each other with raffinate storage tank feed inlet, raffinate storage tank discharge gate passes through the export pump and links to each other with raffinate knockout tower lower part, raffinate knockout tower top and tower bottom are equipped with differential pressure transmitter, the middle part and the upper portion of raffinate knockout tower are equipped with stainless steel ripple filler, stainless steel ripple filler range upon range of by a plurality of monomers and form, every monomer all is flaky corrugated, raffinate knockout tower upside gas outlet links to each other with burning furnace, raffinate knockout tower downside is equipped with first drain and second leakage fluid dram, first drain is continuous with formaldehyde absorption tower moisturizing groove, the second leakage fluid dram links to each other with the effluent water sump, raffinate knockout tower inside top is equipped with spray set, lye tank passes through the pipeline and links to each other with raffinate knockout tower spray set.
2. The method for treating the methanol rectifying tower raffinate treatment device according to claim 1, characterized by comprising the following steps:
(1) Injecting the residual liquid in the methanol rectifying tower into an inlet of a heat exchanger through a residual liquid pump, and reducing the temperature of the residual liquid from 105 ℃ to 40 ℃ by the heat exchanger;
(2) Cooling the residual liquid and injecting into a residual liquid storage tank;
(3) Pumping the residual liquid in the residual liquid storage tank into a residual liquid separation tower through an outlet pump, heating and distilling, wherein the distillation temperature is 65-70 ℃, the packing in the residual liquid separation tower absorbs oily impurities in the residual liquid, and the tower bottom liquid enters a water replenishing tank of a formaldehyde absorption tower through a first liquid discharge port;
(4) Conveying the tower bottom liquid in the water replenishing tank of the formaldehyde absorption tower to absorb formaldehyde and conveying the formaldehyde to a downward moving process of formaldehyde production;
(5) A small amount of methanol steam is discharged from a gas outlet at the top of the methanol raffinate separation tower and is combusted in an incinerator;
(6) After a period of time, detecting the pressure difference between the top and the bottom of the residual liquid separation tower through a differential pressure transmitter arranged at the top and the bottom of the residual liquid separation tower, stopping pumping by an outlet pump when the pressure difference is larger than 55kPa, injecting sodium hydroxide alkali liquor in an alkali liquor tank into a spraying device, wherein the pH value of the sodium hydroxide alkali liquor is larger than 9, spraying and washing filler in the residual liquid separation tower, and delivering the washed alkali liquor into a sewage tank through a second liquid outlet and then delivering the sewage tank to a sewage station for treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211441852.5A CN115724489B (en) | 2022-11-17 | 2022-11-17 | Residual liquid treatment device and treatment method for methanol rectifying tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211441852.5A CN115724489B (en) | 2022-11-17 | 2022-11-17 | Residual liquid treatment device and treatment method for methanol rectifying tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115724489A true CN115724489A (en) | 2023-03-03 |
| CN115724489B CN115724489B (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211441852.5A Active CN115724489B (en) | 2022-11-17 | 2022-11-17 | Residual liquid treatment device and treatment method for methanol rectifying tower |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11226560A (en) * | 1998-02-13 | 1999-08-24 | Hitachi Ltd | Method and device for treating waste liquid or waste water |
| CN101717163A (en) * | 2009-09-28 | 2010-06-02 | 山西兰花丹峰化工股份有限公司 | Method for processing methanol rectified raffinate |
| CN207101939U (en) * | 2017-06-23 | 2018-03-16 | 久泰能源内蒙古有限公司 | A kind of distillation system that refined methanol and fusel oil are extracted from crude carbinol |
| CN109694116A (en) * | 2019-01-18 | 2019-04-30 | 北京京润水务有限公司 | A kind of compounded mix unit, dynamic oil-water separating device and separation method using it |
| CN112169377A (en) * | 2020-11-10 | 2021-01-05 | 中科瑞丽分离科技无锡有限公司 | Demulsification filler and horizontal oil-water separation filter containing same |
| CN113788738A (en) * | 2021-10-18 | 2021-12-14 | 北京中科康仑环境科技研究院有限公司 | Comprehensive treatment method of alcohol, water and oil mixed solution |
-
2022
- 2022-11-17 CN CN202211441852.5A patent/CN115724489B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11226560A (en) * | 1998-02-13 | 1999-08-24 | Hitachi Ltd | Method and device for treating waste liquid or waste water |
| CN101717163A (en) * | 2009-09-28 | 2010-06-02 | 山西兰花丹峰化工股份有限公司 | Method for processing methanol rectified raffinate |
| CN207101939U (en) * | 2017-06-23 | 2018-03-16 | 久泰能源内蒙古有限公司 | A kind of distillation system that refined methanol and fusel oil are extracted from crude carbinol |
| CN109694116A (en) * | 2019-01-18 | 2019-04-30 | 北京京润水务有限公司 | A kind of compounded mix unit, dynamic oil-water separating device and separation method using it |
| CN112169377A (en) * | 2020-11-10 | 2021-01-05 | 中科瑞丽分离科技无锡有限公司 | Demulsification filler and horizontal oil-water separation filter containing same |
| CN113788738A (en) * | 2021-10-18 | 2021-12-14 | 北京中科康仑环境科技研究院有限公司 | Comprehensive treatment method of alcohol, water and oil mixed solution |
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| Publication number | Publication date |
|---|---|
| CN115724489B (en) | 2023-12-08 |
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