CN115724489B - Residual liquid treatment device and treatment method for methanol rectifying tower - Google Patents
Residual liquid treatment device and treatment method for methanol rectifying tower Download PDFInfo
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- CN115724489B CN115724489B CN202211441852.5A CN202211441852A CN115724489B CN 115724489 B CN115724489 B CN 115724489B CN 202211441852 A CN202211441852 A CN 202211441852A CN 115724489 B CN115724489 B CN 115724489B
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- residual liquid
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- 239000007788 liquid Substances 0.000 title claims abstract description 152
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 12
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 93
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 239000010865 sewage Substances 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 15
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 230000001502 supplementing effect Effects 0.000 claims abstract description 13
- 238000010521 absorption reaction Methods 0.000 claims abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 7
- 239000010935 stainless steel Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- 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
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The residual liquid treatment device comprises a methanol rectifying tower, a residual liquid pump, a heat exchanger, a residual liquid storage tank, an outlet pump, a residual liquid separating tower, an alkali liquid tank, a formaldehyde absorbing tower water supplementing tank, an incinerator and a sewage tank, wherein stainless steel corrugated packing is arranged in the residual liquid separating tower, a spraying device is arranged at the inner top of the residual liquid separating tower, and the alkali liquid tank is connected with the spraying device. The treatment method comprises the following steps: cooling the residual liquid to 40 ℃, then injecting the residual liquid into a residual liquid separation tower for heating and distilling, adsorbing oily impurities in the residual liquid by a filler, and allowing the bottom liquid to enter a water supplementing tank of a formaldehyde absorption tower; the methanol steam is discharged from a gas outlet at the top of the methanol residual liquid separation tower and is burnt by an incinerator; when the pressure difference between the top and the bottom of the tower is more than 55kPa, the filling is sprayed and washed by 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 out water in the residual liquid, be used for producing formaldehyde, reduce the treatment capacity of a sewage station and save water resources.
Description
Technical Field
The invention relates to a device and a method for treating residual liquid of a methanol rectifying tower.
Background
In the production of methanol, the rectification and concentration of crude methanol are required to be subjected to the step of normal pressure rectification, the residual liquid at the bottom of the normal pressure rectification is generally directly sent to a sewage station for treatment and then is discharged, the detected residual liquid contains about 99 percent of water, and the residual 1 percent contains various alcohols (methanol, ethanol, n-propanol and the like) and a very small amount of other organic matters, and the residual liquid is sent to the sewage station for treatment and is discharged, so that 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 residual liquid treatment device of a methanol rectifying tower, which can intensively treat residual liquid of the methanol rectifying tower, separate water from the residual liquid, be used for formaldehyde production, 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 a treatment method of the residual liquid treatment device of the methanol rectifying tower, which has simple steps and can remove organic matters in the residual liquid of the methanol rectifying tower and be used for formaldehyde production.
In order to solve the first technical problem, the invention provides a residual liquid treatment device of a methanol rectifying tower, which comprises a methanol rectifying tower, a residual liquid pump, a heat exchanger, a residual liquid storage tank, an outlet pump, a residual liquid separating tower, an alkali liquid tank, a formaldehyde absorbing tower water supplementing tank, an incinerator and a sewage tank, wherein a residual liquid outlet at the lower side of the methanol rectifying 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 feeding port of the residual liquid storage tank, a discharging port of the residual liquid storage tank is connected with the lower part of the residual liquid separating tower through the outlet pump, differential pressure transmitters are arranged at the top and the bottom of the residual liquid separating tower, stainless steel corrugated fillers are arranged at the middle part and the upper part of the residual liquid separating tower, the stainless steel corrugated fillers are formed by stacking a plurality of monomers, each monomer is in a sheet corrugated shape, a gas outlet at the upper side of the residual liquid separating tower is connected with the incinerator, a first liquid outlet and a second liquid outlet are arranged at the lower side of the residual liquid separating tower, the first liquid outlet is connected with the formaldehyde absorbing tower water supplementing tank, the second liquid outlet is connected with the sewage tank, a spraying device is arranged at the top of the residual liquid separating tower, and the alkali liquid is connected with the spraying 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 rectifying tower, which comprises the following steps:
(1) Injecting 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 ℃ through the heat exchanger;
(2) Injecting the cooled residual liquid 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 for heating and distilling, wherein the distilling temperature is 65-70 ℃, and the filler in the residual liquid separation tower adsorbs oily impurities in the residual liquid, and the tower bottom liquid enters a formaldehyde absorption tower water supplementing tank through a first liquid outlet;
(4) The bottom liquid in the water supplementing tank of the formaldehyde absorption tower is conveyed to the formaldehyde absorption tower to absorb formaldehyde and is conveyed to a downward shifting process of formaldehyde production;
(5) A small amount of methanol steam is discharged from a gas outlet at the top of the methanol residual liquid separation tower and is burnt by 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 lye in a lye tank into a spraying device, spraying and washing fillers in the residual liquid separation tower, and enabling the washed lye to enter a sewage tank through a second liquid outlet and then be sent 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 from the residual liquid and be used for formaldehyde production (generally, methanol and formaldehyde production lines coexist, namely, factories for producing methanol generally synchronously produce formaldehyde), thereby reducing the treatment capacity of sewage stations and saving water resources. Wherein the residual liquid storage tank is used for temporarily storing residual liquid and playing a role of buffering so as to prevent the formaldehyde absorption tower from being affected when no residual liquid is generated in the methanol rectification system. The absorption effect of the filler can be maintained by spraying and washing the filler by alkali liquor.
Drawings
Fig. 1 is a schematic flow chart of the present invention.
Detailed Description
Referring to fig. 1, a device for treating residual liquid in a methanol rectifying tower 1 comprises a methanol rectifying tower 1, a residual liquid pump 11, a heat exchanger 2 (an evaporative condenser is adopted in the heat exchanger 2), a residual liquid storage tank 3, an outlet pump 31, a residual liquid separating tower 4, an alkali liquor tank 6, a formaldehyde absorbing tower water supplementing tank 7, an incinerator 5 and a sewage tank 8, wherein a residual liquid outlet on the lower side of the methanol rectifying tower 1 is connected with an inlet of the heat exchanger 2 through the residual liquid pump 11, an outlet of the heat exchanger 2 is connected with a feed port of the residual liquid storage tank 3, a discharge port of the residual liquid storage tank 3 is connected with the lower part of the residual liquid separating tower 4 through the outlet pump 31, differential pressure transmitters (not shown in the differential pressure transmitter diagram) are arranged at the top and bottom of the residual liquid separating tower 4, stainless steel corrugated fillers 41 are arranged in the middle and upper parts of the residual liquid separating tower 4, the stainless steel corrugated fillers 41 are formed by stacking a plurality of monomers, each monomer is in a sheet corrugated shape (the stainless steel corrugated fillers are mature products in the field, the upper side of the residual liquid separating tower 4 is connected with the incinerator 5 through a first liquid drain port and a second liquid drain port, the second liquid drain port is connected with the formaldehyde absorbing tower 4, and the residual liquid is connected with the upper liquid drain port of the sewage tank 4 through a second liquid drain port 42, and the first liquid drain port is connected with the second liquid drain port of the formaldehyde absorbing tower 4 through a drain port and the second liquid drain port 42 is connected with the drain port of the formaldehyde absorbing device 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 residual liquid and then injecting the cooled residual liquid into a residual liquid storage tank 3;
(3) Pumping the 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 distilling temperature is 65-70 ℃, and a filler 41 in the residual liquid separation tower 4 adsorbs oily impurities (the oily impurities are mainly methanol oil) in the residual liquid, and the bottom liquid enters a formaldehyde absorption tower water supplementing tank 7 through a first liquid outlet;
(4) The bottom liquid in the water supplementing tank 7 of the formaldehyde absorption tower is conveyed to the formaldehyde absorption tower to absorb formaldehyde and is conveyed to a downward shifting process of formaldehyde production;
(5) A small amount of methanol steam is discharged from a gas outlet at the top of the methanol residual liquid separation tower 4 and is burnt by the incinerator 5;
(6) After a while, detecting the pressure difference between the top and the bottom of the residual liquid separation tower 4 by a differential pressure transmitter arranged at the top and the bottom of the residual liquid separation tower, when the pressure difference is larger than 55kPa, stopping pumping by an outlet pump 31, injecting sodium hydroxide alkali liquor into a spraying device 42 by an alkali liquor tank 6, spraying and washing a filler 41 in the residual liquid separation tower 4, wherein the pH value of the sodium hydroxide solution is larger than 9, and feeding the washed alkali liquor into a sewage tank 8 through a second liquid outlet and then treating the sewage station.
Claims (1)
1. A method for treating residual liquid of a methanol rectifying tower is characterized by comprising the following steps of: the device comprises a methanol rectifying tower, a residual liquid pump, a heat exchanger, a residual liquid storage tank, an outlet pump, a residual liquid separating tower, an alkali liquid tank, a formaldehyde absorbing tower water supplementing tank, an incinerator and a sewage tank, wherein a residual liquid outlet at the lower side of the methanol rectifying 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 feeding port of the residual liquid storage tank, a discharging port of the residual liquid storage tank is connected with the lower part of the residual liquid separating tower through the outlet pump, differential pressure transmitters are arranged at the top and the bottom of the residual liquid separating tower, stainless steel corrugated fillers are arranged at the middle part and the upper part of the residual liquid separating tower and are formed by stacking a plurality of monomers, each monomer is in a flaky corrugated shape, a gas outlet at the upper side of the residual liquid separating tower is connected with the incinerator, a first liquid outlet and a second liquid outlet are arranged at the lower side of the residual liquid separating tower, the first liquid outlet is connected with the water supplementing tank of the formaldehyde absorbing tower, the second liquid outlet is connected with the sewage tank, a residual liquid spraying device is arranged at the top in the separating tower, and the alkali liquid tank is connected with a residual liquid spraying device through a pipeline;
the treatment method of the residual liquid comprises the following steps:
(1) Injecting 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 ℃ through the heat exchanger;
(2) Injecting the cooled residual liquid 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 for heating and distilling, wherein the distilling temperature is 65-70 ℃, and the filler in the residual liquid separation tower adsorbs oily impurities in the residual liquid, and the tower bottom liquid enters a formaldehyde absorption tower water supplementing tank through a first liquid outlet;
(4) The bottom liquid in the water supplementing tank of the formaldehyde absorption tower is conveyed to the formaldehyde absorption tower to absorb formaldehyde and is conveyed to a downward shifting process of formaldehyde production;
(5) A small amount of methanol steam is discharged from a gas outlet at the top of the methanol residual liquid separation tower and is burnt by 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 lye in a lye tank into a spraying device, spraying and washing fillers in the residual liquid separation tower, and enabling the washed lye to enter a sewage tank through a second liquid outlet and then be sent 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 CN115724489A (en) | 2023-03-03 |
| CN115724489B true CN115724489B (en) | 2023-12-08 |
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|---|---|---|---|
| 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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| CN115724489A (en) | 2023-03-03 |
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