CN111453703A - Method and device for producing high-concentration hydrogen sulfide by low-temperature methanol purification - Google Patents

Method and device for producing high-concentration hydrogen sulfide by low-temperature methanol purification Download PDF

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CN111453703A
CN111453703A CN202010246011.3A CN202010246011A CN111453703A CN 111453703 A CN111453703 A CN 111453703A CN 202010246011 A CN202010246011 A CN 202010246011A CN 111453703 A CN111453703 A CN 111453703A
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methanol
hydrogen sulfide
regeneration section
alcohol
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CN111453703B (en
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王建雄
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Shaanxi Juneng New Coal Chemical Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/16—Hydrogen sulfides
    • C01B17/167—Separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1418—Recovery of products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1425—Regeneration of liquid absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1462—Removing mixtures of hydrogen sulfide and carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/202—Alcohols or their derivatives
    • B01D2252/2021—Methanol

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Abstract

The invention belongs to the technical field of chemical industry, and relates to a method and a device for producing high-concentration hydrogen sulfide by low-temperature methanol purification2And release of CO2The sulfur-rich methanol of (a); rich in CO2After cooling, the condensed alcohol solution is regenerated continuously and is rich in CO2Gas is discharged and sent to alcohol washing; CO evolution2The sulfur-rich methanol is divided into two paths, one path is H2H released after S regeneration2S and concentrating to obtain high-purity H2S gas; the other path generates a gas phase and a water phase after thermal regeneration of methanol, and the gas phase is upwards used for CO2And H2S regeneration, the water phase is downwards separated by alcohol and water to obtain qualified methanol and waste water after thermal regeneration, and the qualified methanol is thermally regeneratedAnd the obtained product is subjected to heat exchange with methanol gas and is cooled to be used as lean methanol for alcohol washing. The invention, H, is realized at low temperature2The high-purity enrichment of S can simultaneously obtain pure methanol, the process flow is simple, the energy consumption is low, and the equipment is few.

Description

Method and device for producing high-concentration hydrogen sulfide by low-temperature methanol purification
Technical Field
The invention belongs to the technical field of chemical industry, relates to a method and a device for producing high-concentration hydrogen sulfide gas, and particularly relates to a method and a device for producing high-concentration hydrogen sulfide through low-temperature methanol purification.
Background
At the present stage, the low-temperature methanol washing takes cold methanol as an absorption solvent, and uses the methanol to carry out acid treatment at low temperatureThe process flow generally comprises an absorption tower and a plurality of desorption towers, the absorption tower absorbs the acid gas, the desorption tower desorbs the acid gas and returns barren solution methanol to the absorption tower, and the purpose of recycling the methanol is achieved. However, the low-temperature methanol purification process is not easy to obtain high-concentration H2S gas, mostly rich in hydrogen sulfide (where H is2S about 25-35%, and the balance CO2And a small amount of N2) And the purity of the methanol is not high.
Disclosure of Invention
In order to solve the problem of H in the prior low-temperature methanol process2The invention provides a method and a device for producing high-concentration hydrogen sulfide by low-temperature methanol purification, which solve the problems of low S concentration and low methanol purity and realize H at low temperature2The high-purity enrichment of S can simultaneously obtain pure methanol, the process flow is simple, the energy consumption is low, and the equipment is few.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for producing high-concentration hydrogen sulfide by low-temperature methanol purification comprises the following steps:
1) the methanol gas is subjected to alcohol washing, heat exchange and temperature rise to obtain alcohol-washed sulfur-rich methanol, and the alcohol-washed sulfur-rich methanol is regenerated to obtain CO2And release of CO2The sulfur-rich methanol of (a); rich in CO2After cooling, the condensed alcohol solution is regenerated continuously and is rich in CO2Gas is discharged and sent to alcohol washing;
2) CO Release in step 2)2The sulfur-rich methanol is divided into two paths, one path is passed through H2H released after S regeneration2S and concentrating to obtain high-purity H2S gas; the other path generates a gas phase and a water phase after thermal regeneration of methanol, and the gas phase is upwards used for CO2And H2And S regeneration, namely separating the water phase downwards through alcohol-water to obtain qualified thermally regenerated methanol and wastewater, and performing heat exchange and cooling on the qualified thermally regenerated methanol and methanol gas to obtain lean methanol for alcohol washing.
The specific process of the step 1) is that after the methanol rich in sulfur is washed by alcohol and regenerated by a carbon dioxide regeneration section in the clapboard tower, the obtained CO is rich in CO2The tower top of the carbon dioxide regeneration section of the clapboard tower (1)After cooling, the condensed alcohol liquid flows back to a carbon dioxide regeneration section in the clapboard tower to be rich in CO2The gas is discharged to the alcohol wash.
The specific process of the step 2) is to release CO2The sulfur-rich methanol is divided into two paths, one path is sent to a hydrogen sulfide regeneration section pair H in the clapboard tower2S, regenerating; after the tower top gas of the hydrogen sulfide regeneration section exchanges heat with the methanol thermal regeneration section for cooling, the liquid phase respectively returns to the bottom of the carbon dioxide regeneration section and the top of the hydrogen sulfide regeneration section, and the gas phase is concentrated to obtain high-purity H2S; the other path of the gas passes through a methanol heat regeneration section in the clapboard tower to carry out methanol heat regeneration, and the dissolved gas upwards respectively enters a carbon dioxide regeneration section and a hydrogen sulfide regeneration section; the water phase enters the alcohol-water separation section downwards to separate water, the wastewater is sent out of a boundary area from the bottom of the clapboard tower, and qualified methanol after thermal regeneration and methanol gas exchange heat and are cooled to be used as poor methanol for alcohol washing.
In the above methanol gas, H2S and CO2The molar ratio of (A) to (B) is 1:6-2: 1.
A device for producing high-concentration hydrogen sulfide by low-temperature methanol purification comprises a clapboard tower, a reflux tank and a reboiler;
a partition plate is arranged at the upper part in the partition plate tower, and divides the upper space in the partition plate tower into a left area and a right area which are respectively a carbon dioxide regeneration section and a hydrogen sulfide regeneration section;
the reboiler is connected with the carbon dioxide regeneration section; the outlet of the carbon dioxide regeneration section is positioned at the top of the clapboard tower, and the outlet of the carbon dioxide regeneration section is connected with the inlet of the carbon dioxide regeneration section; the outlet of the hydrogen sulfide regeneration section is positioned at the top of the clapboard tower, the outlet of the hydrogen sulfide regeneration section is connected with the inlet of the reflux tank, and the outlet of the reflux tank is respectively connected with the inlets of the carbon dioxide regeneration section and the hydrogen sulfide regeneration section.
The device for producing high-concentration hydrogen sulfide by low-temperature methanol purification also comprises a tower top condenser; and an outlet at the top of the carbon dioxide regeneration section is connected with an inlet of the carbon dioxide regeneration section after passing through a condenser at the top of the tower.
The device for producing high-concentration hydrogen sulfide by low-temperature methanol purification also comprises a heat exchanger;
a methanol heat regeneration section is arranged below the carbon dioxide regeneration section and the hydrogen sulfide regeneration section; the outlet of the methanol heat regeneration section is connected with a reboiler, and the inlet of the methanol heat regeneration section is connected with a heat exchanger; and an outlet of the hydrogen sulfide regeneration section is connected with an inlet of the reflux tank through a heat exchanger.
The device for producing high-concentration hydrogen sulfide by low-temperature methanol purification also comprises a tower bottom condenser; the bottom of the clapboard tower is provided with an alcohol-water separation section; the alcohol-water separation section is positioned below the methanol heat generation section; and the outlet at the bottom of the alcohol-water separation section returns to the alcohol-water separation section after passing through a tower bottom condenser.
The invention has the beneficial effects that:
1. in the invention, the methanol rich in sulfur washed by alcohol enters a clapboard tower CO2In the middle-lower part of the regeneration section, CO is firstly treated2Is regenerated and released and then enters H2S regeneration section pair H2S is regenerated and recycled and is rich in CO2The condensed alcohol liquid after the gas is cooled from the top of the tower flows back to the top of the clapboard tower and is rich in CO2Discharging gas and sending to alcohol washing; can obtain H at low temperature2The S gas is concentrated to obtain high-purity hydrogen sulfide, the process flow is simple, and the energy consumption is low.
2. In the present invention, CO is released2The sulfur-rich methanol is subjected to methanol thermal regeneration in a methanol thermal regeneration section, and the dissolved gas enters CO upwards2Regeneration section and H2The water phase enters the alcohol-water separation section downwards to separate water, and the qualified methanol after thermal regeneration and the methanol gas after heat exchange can be used as poor methanol to remove alcohol washing, so that the energy consumption is reduced, and high-concentration H is obtained2The methanol can be regenerated and dehydrated while the S is enriched, so that pure methanol is obtained.
3. In the invention, the clapboard tower is adopted to realize the regeneration dehydration of methanol and H2The high purity of S gas is rich, the equipment is less, and the device structure is simple.
Drawings
FIG. 1 is a flow chart of a process for producing high concentration hydrogen sulfide by low temperature methanol purification provided by the present invention;
wherein:
1-a baffled tower; 2-overhead condenser; 3-tower bottom condenser; 4-a reflux tank; 5, a heat exchanger; 6-reboiler.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 1, the device for producing high-concentration hydrogen sulfide by low-temperature methanol purification provided by the invention comprises a clapboard tower 1, a reflux tank 4 and a reboiler 6.
Referring to fig. 1, in the embodiment, a partition is arranged at the upper part in a partition tower 1, the partition divides the upper space in the partition tower 1 into a carbon dioxide regeneration section and a hydrogen sulfide regeneration section, and a methanol heat regeneration section is arranged below the carbon dioxide regeneration section and the hydrogen sulfide regeneration section; an alcohol-water separation section is arranged at the inner bottom part of the clapboard tower 1.
Specifically, a defoaming net is arranged at the top end in the clapboard tower 1; then dividing the clapboard tower into a left area and a right area by an axial clapboard, wherein the left area is a carbon dioxide regeneration section, and the right area is a hydrogen sulfide regeneration section; a methanol heat regeneration section and an alcohol-water separation section are sequentially arranged below the carbon dioxide regeneration section and the hydrogen sulfide regeneration section in the clapboard tower 1.
Further, the device for producing high-concentration hydrogen sulfide by low-temperature methanol purification also comprises a tower top condenser 2, a heat exchanger 5 and a tower bottom condenser 3.
Referring to fig. 1, in this embodiment, a reboiler 6 is connected to the carbon dioxide regeneration section; the outlet of the carbon dioxide regeneration section is positioned at the top of the clapboard tower 1, and the outlet of the carbon dioxide regeneration section is connected with the inlet of the carbon dioxide regeneration section; the outlet of the hydrogen sulfide regeneration section is positioned at the top of the clapboard tower, the outlet of the hydrogen sulfide regeneration section is connected with the inlet of the reflux tank 4, and the outlet of the reflux tank 4 is respectively connected with the inlets of the carbon dioxide regeneration section and the hydrogen sulfide regeneration section.
Specifically, the reboiler 6 is connected with the carbon dioxide regeneration section; the outlet of the top of the carbon dioxide regeneration section is connected with the carbon dioxide regeneration section after passing through the overhead condenser 2; the outlet of the top of the hydrogen sulfide regeneration section sequentially passes through a heat exchanger 5 and a reflux tank 4 and then is divided into two paths, one path is connected with the carbon dioxide regeneration section and the hydrogen sulfide regeneration section in the clapboard tower 1, the other path is cooled, high-concentration hydrogen sulfide is recovered from a gas phase, and liquid is connected with the reflux tank 4; the methanol heat regeneration section is respectively connected with the reboiler 6 and the heat exchanger 5, and is connected with the inlet of the methanol heat regeneration section after passing through the heat exchanger 5; the outlet of the hydrogen sulfide regeneration section is connected with the inlet of the reflux tank 4 through a heat exchanger 5. The outlet at the bottom of the alcohol-water separation section is connected with the alcohol-water separation section after passing through a tower bottom condenser 3.
In this embodiment, the device equipment that low temperature methanol purified production high concentration hydrogen sulfide is few, and device simple structure.
The device provided by the embodiment is adopted to carry out low-temperature methanol purification to produce high-concentration hydrogen sulfide, and the method comprises the following steps:
1) the methanol gas is subjected to alcohol washing, heat exchange and temperature rise to obtain alcohol-washed sulfur-rich methanol, and the alcohol-washed sulfur-rich methanol is regenerated to obtain CO2And release of CO2The sulfur-rich methanol of (a); rich in CO2After cooling, the condensed alcohol solution is regenerated continuously and is rich in CO2Gas is discharged and sent to alcohol washing;
2) CO Release in step 2)2The sulfur-rich methanol is divided into two paths, one path is passed through H2H released after S regeneration2S and concentrating to obtain high-purity H2S gas; the other path generates a gas phase and a water phase after thermal regeneration of methanol, and the gas phase is upwards used for CO2And H2And S regeneration, namely separating the water phase downwards through alcohol-water to obtain qualified thermally regenerated methanol and wastewater, and performing heat exchange and cooling on the qualified thermally regenerated methanol and methanol gas to obtain lean methanol for alcohol washing.
In this embodiment, the specific process of step 1) is that after the methanol rich in sulfur is washed with alcohol and regenerated by the carbon dioxide regeneration section in the partition tower 1, the obtained rich CO is obtained2CO from the baffle column 12The condensed alcohol liquid flows back to the carbon dioxide regeneration section in the clapboard tower 1 after the regeneration section tower top comes out and is cooled, and the CO is enriched2The gas is discharged to the alcohol wash.
In this embodiment, the specific process of step 2) is releasing CO2The sulfur-rich methanol is divided into two paths, one path is sent to a hydrogen sulfide regeneration section pair H in the clapboard tower 12S, regenerating; after the overhead gas of the hydrogen sulfide regeneration section exchanges heat with the methanol thermal regeneration section for cooling, the liquid phases respectively flow back to the dioxygenThe gas phase at the bottom of the carbon regeneration section and the top of the hydrogen sulfide regeneration section is concentrated to obtain high-purity H2S; the other path of the gas passes through a methanol heat regeneration section in the clapboard tower 1 to carry out methanol heat regeneration, and the dissolved gas upwards respectively enters a carbon dioxide regeneration section and a hydrogen sulfide regeneration section; the water phase enters the alcohol-water separation section downwards to separate water, the wastewater is sent out of a boundary area from the bottom of the clapboard tower 1, and qualified methanol after thermal regeneration and methanol gas exchange heat and are cooled to be used as poor methanol for alcohol washing.
In this example, H is contained in methanol gas2S and CO2The molar ratio of (A) to (B) is 1:6-2: 1.
Example 2
The method for producing high-concentration hydrogen sulfide by low-temperature methanol purification is illustrated by taking a specific application as an example.
In this example, the methanol gas (mainly containing H) from stripping2S and CO2)，H2S and CO2In a molar ratio of 1: 6.
1) Methanol gas enters a carbon dioxide regeneration section from the middle part of the carbon dioxide regeneration section on the clapboard tower after being subjected to alcohol washing, the pressure of the clapboard tower is about 0.05MPa, and CO in the methanol gas is released2Gas, CO liberated2Condensing the carbon dioxide from the outlet of the carbon dioxide regeneration section through a tower top condenser to obtain a gas phase rich in CO2The gas can be collected and utilized, the temperature is 22 ℃, the carbon dioxide in the gas phase is 91 percent, and the hydrogen sulfide is 5 percent; the liquid phase is alcohol liquid CO from the clapboard tower2The upper part of the regeneration section returns to the clapboard tower;
2) CO evolution2The sulfur-rich methanol is divided into two paths:
one path enters a hydrogen sulfide regeneration section at the right side of the top of the clapboard tower to carry out H2S is regenerated, H is released2The top outlet of the S hydrogen sulfide regeneration section exchanges heat with the methanol heat regeneration section through a heat exchanger 5, the S hydrogen sulfide regeneration section enters a reflux tank 4, the liquid phase returns to the top of the hydrogen sulfide regeneration section in the clapboard tower and the bottom of the carbon dioxide regeneration section in the clapboard tower through reflux, a small part of liquid phase carried by the condensed gas phase is sent to the reflux tank 4, and H is2Collecting S gas, wherein the temperature of a gas phase is-10 ℃, the hydrogen sulfide content is 93%, and the carbon dioxide content is 2%; and concentrating to obtain high-concentrationH2S gas;
the other path enters a methanol heat regeneration section for methanol heat regeneration, the dissolved gas upwards enters a carbon dioxide regeneration section and a hydrogen sulfide regeneration section, and after the liquid phase comes out of the methanol heat regeneration section, part of qualified methanol is used as poor methanol to be subjected to alcohol washing after passing through a reboiler 6; the water phase enters the alcohol-water separation section downwards to separate water to obtain pure methanol, and the separated wastewater is separated from the bottom of the clapboard tower through a tower bottom condenser and is sent out of a battery limit.
Example 3
In this example, the methanol gas (mainly containing H) from stripping2S and CO2)，H2S and CO2At a molar ratio of 1:2, the pressure of the dividing wall column is about 0.15MPa, the gas phase is CO-rich2The gas can be collected (cooled) for use, the temperature is 30 ℃, the carbon dioxide content in the gas phase is 92 percent, and the hydrogen sulfide content is 3 percent; h2Collecting S gas (after cooling), wherein the temperature of the gas phase is 2 ℃, 94% of hydrogen sulfide, 2% of carbon dioxide and H2The S gas can be further concentrated to obtain high-concentration H2And (5) recycling the S gas.
Example 4
In this example, the methanol gas (mainly containing H) from stripping2S and CO2)，H2S and CO2In a molar ratio of 2:1, the pressure of the dividing wall column is about 0.25MPa, the gas phase is rich in CO2The gas (after cooling) can be collected and utilized, the temperature is 15 ℃, the carbon dioxide in the gas phase is 90 percent, and the hydrogen sulfide is 3.5 percent; h2S gas (after cooling) is collected, and the temperature of the gas phase is 15 ℃, 95% of hydrogen sulfide, 2.5% of carbon dioxide and H2The S gas can be further concentrated to obtain high-concentration H2And (5) recycling the S gas.
From the above, the method for producing high-concentration hydrogen sulfide by low-temperature methanol purification has the advantages of simple process flow and lowest energy consumption, and the hydrogen sulfide gas can be regenerated and dehydrated while obtaining high-concentration enriched product to obtain pure methanol, so that the whole device has few equipment.

Claims (8)

1. A method for producing high-concentration hydrogen sulfide by low-temperature methanol purification is characterized by comprising the following steps: the method comprises the following steps:
1) the methanol gas is subjected to alcohol washing, heat exchange and temperature rise to obtain alcohol-washed sulfur-rich methanol, and the alcohol-washed sulfur-rich methanol is regenerated to obtain CO2And release of CO2The sulfur-rich methanol of (a); rich in CO2After cooling, the condensed alcohol solution is regenerated continuously and is rich in CO2Gas is discharged and sent to alcohol washing;
2) CO Release in step 2)2The sulfur-rich methanol is divided into two paths, one path is passed through H2H released after S regeneration2S and concentrating to obtain high-purity H2S gas; the other path generates a gas phase and a water phase after thermal regeneration of methanol, and the gas phase is upwards used for CO2And H2And S regeneration, namely separating the water phase downwards through alcohol-water to obtain qualified thermally regenerated methanol and wastewater, and performing heat exchange and cooling on the qualified thermally regenerated methanol and methanol gas to obtain lean methanol for alcohol washing.
2. The method for producing high concentration hydrogen sulfide by low temperature methanol purification according to claim 1, wherein: the specific process of the step 1) is that after the methanol rich in sulfur is washed by alcohol and regenerated by a carbon dioxide regeneration section in the clapboard tower (1), the obtained CO rich in sulfur is obtained2Coming out from the top of the carbon dioxide regeneration section tower in the clapboard tower (1), cooling, and refluxing the condensed alcohol liquid to the carbon dioxide regeneration section in the clapboard tower (1) to enrich CO2The gas is discharged to the alcohol wash.
3. The method for producing high concentration hydrogen sulfide by low temperature methanol purification according to claim 1, wherein: the specific process of the step 2) is releasing CO2The sulfur-rich methanol is divided into two paths, one path is sent to a hydrogen sulfide regeneration section pair H in the clapboard tower (1)2S, regenerating; after the tower top gas of the hydrogen sulfide regeneration section exchanges heat with the methanol thermal regeneration section for cooling, the liquid phase respectively returns to the bottom of the carbon dioxide regeneration section and the top of the hydrogen sulfide regeneration section, and the gas phase is concentrated to obtain high-purity H2S; the other path of the gas passes through a methanol heat regeneration section in the clapboard tower (1) to carry out methanol heat regeneration, and the dissolved gas upwards respectively enters a carbon dioxide regeneration section and a hydrogen sulfide regeneration section; the water phase enters the alcohol-water separation section downwards to separate water, and the wastewater is separated from the alcohol-water separation sectionAnd (3) the bottom of the clapboard tower (1) is sent out of a battery limit, and qualified methanol after thermal regeneration and methanol gas exchange heat and are cooled to be used as lean methanol for alcohol washing.
4. The method for producing high concentration hydrogen sulfide by low temperature methanol purification as claimed in claim 1 or 2, wherein: in the methanol gas, H2S and CO2The molar ratio of (A) to (B) is 1:6-2: 1.
5. An apparatus for implementing the method for producing high-concentration hydrogen sulfide by low-temperature methanol purification of claim 1, which is characterized in that: the device for producing high-concentration hydrogen sulfide by low-temperature methanol purification comprises a clapboard tower (1), a reflux tank (4) and a reboiler (6);
a partition plate is arranged at the upper part in the partition plate tower (1), the partition plate divides the upper space in the partition plate tower (1) into a left area and a right area, and the two areas are a carbon dioxide regeneration section and a hydrogen sulfide regeneration section respectively;
the reboiler (6) is connected with the carbon dioxide regeneration section; the outlet of the carbon dioxide regeneration section is positioned at the top of the clapboard tower (1), and the outlet of the carbon dioxide regeneration section is connected with the inlet of the carbon dioxide regeneration section; the outlet of the hydrogen sulfide regeneration section is positioned at the top of the clapboard tower, the outlet of the hydrogen sulfide regeneration section is connected with the inlet of the reflux tank (4), and the outlet of the reflux tank (4) is connected with the inlets of the carbon dioxide regeneration section and the hydrogen sulfide regeneration section respectively.
6. The apparatus for producing high concentration hydrogen sulfide by low temperature methanol purification according to claim 5, wherein: the device for producing high-concentration hydrogen sulfide by low-temperature methanol purification also comprises a tower top condenser (2); and an outlet at the top of the carbon dioxide regeneration section is connected with an inlet of the carbon dioxide regeneration section after passing through a condenser at the top of the tower.
7. The apparatus for producing high concentration hydrogen sulfide by low temperature methanol purification according to claim 5, wherein: the device for producing high-concentration hydrogen sulfide by low-temperature methanol purification also comprises a heat exchanger (5);
a methanol heat regeneration section is arranged below the carbon dioxide regeneration section and the hydrogen sulfide regeneration section; the outlet of the methanol heat regeneration section is connected with a reboiler (6), and the inlet of the methanol heat regeneration section is connected with a heat exchanger (5); and the outlet of the hydrogen sulfide regeneration section is connected with the inlet of the reflux tank (4) through a heat exchanger (5).
8. The apparatus for producing high concentration hydrogen sulfide by low temperature methanol purification according to claim 5, wherein: the device for producing high-concentration hydrogen sulfide by low-temperature methanol purification also comprises a tower bottom condenser (3); an alcohol-water separation section is arranged at the inner bottom part of the clapboard tower (1); the alcohol-water separation section is positioned below the methanol heat generation section; and the outlet at the bottom of the alcohol-water separation section returns to the alcohol-water separation section after passing through a tower bottom condenser (3).
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