CN211753897U - Dichloroacetyl chloride tail gas comprehensive recovery processing device - Google Patents
Dichloroacetyl chloride tail gas comprehensive recovery processing device Download PDFInfo
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- CN211753897U CN211753897U CN202020401170.1U CN202020401170U CN211753897U CN 211753897 U CN211753897 U CN 211753897U CN 202020401170 U CN202020401170 U CN 202020401170U CN 211753897 U CN211753897 U CN 211753897U
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- FBCCMZVIWNDFMO-UHFFFAOYSA-N dichloroacetyl chloride Chemical compound ClC(Cl)C(Cl)=O FBCCMZVIWNDFMO-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000011084 recovery Methods 0.000 title claims abstract description 19
- 239000003513 alkali Substances 0.000 claims abstract description 187
- 238000009833 condensation Methods 0.000 claims abstract description 134
- 230000005494 condensation Effects 0.000 claims abstract description 134
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- 238000002360 preparation method Methods 0.000 claims abstract description 18
- 239000003507 refrigerant Substances 0.000 claims description 44
- 239000004743 Polypropylene Substances 0.000 claims description 5
- -1 polypropylene Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 8
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 221
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 27
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 4
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a dichloroacetyl chloride tail gas comprehensive recovery treatment device, which comprises a tail gas buffer A tank, a tail gas buffer B tank, a condensation A group, a condensation B group, a condensate tank, an alkali liquor absorption tower, an alkali liquor preparation tank, an alkali liquor delivery pump, an alkali liquor circulating pump, a pipeline and a control valve; the condensation A group comprises a group A first-stage condenser, a group A second-stage condenser and a group A third-stage condenser; the condensation group B comprises a group B first-stage condenser, a group B second-stage condenser and a group B third-stage condenser. The utility model adopts a method of combining condensation recovery and alkali liquor absorption to comprehensively treat the tail gas, so that the final emission of the tail gas completely reaches the standard; the phosgene in the tail gas is intensively recycled by adopting a mode of connecting three grades of condensers in series, so that conditions are created for recycling the phosgene; two sets of temporary storage and condensation mechanisms are adopted, so that the temporary storage and condensation mechanisms can be used simultaneously or one for standby, the load of the device is reduced, and the flexibility and the stability of the operation of the device are ensured.
Description
Technical Field
The utility model relates to a chemical industry field, concretely relates to dichloroacetyl chloride tail gas comprehensive recovery processing device.
Background
Dichloroacetyl chloride is an important organic synthesis intermediate. At present, a trichloroethylene oxidation method is mainly adopted in a dichloroacetyl chloride synthesis process, generated tail gas mainly comprises phosgene (also called phosgene) and hydrogen chloride, an alkali liquor absorption method is mainly adopted in a tail gas treatment method, although the tail gas is recycled and converted into salts to a certain extent, the final emission standard reaching rate of the tail gas is not ideal; moreover, phosgene as an important organic intermediate is not recycled, which causes resource waste.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a dichloroacetyl chloride tail gas comprehensive recovery processing device.
The technical scheme is as follows: comprises a tail gas buffer A tank, a tail gas buffer B tank, a condensation A group, a condensation B group, a condensate tank, an alkali liquor absorption tower, an alkali liquor preparation tank, an alkali liquor delivery pump, an alkali liquor circulating pump, a pipeline and a control valve; the condensation A group comprises a group A first-stage condenser, a group A second-stage condenser and a group A third-stage condenser; the condensation group B comprises a group B first-stage condenser, a group B second-stage condenser and a group B third-stage condenser; the lower part of the tail gas buffer A tank is provided with an air inlet A, and the top of the tail gas buffer A tank is provided with an air outlet A; the lower part of the tail gas buffer B tank is provided with an air inlet B port, and the top of the tail gas buffer B tank is provided with an air outlet B port; the top of the condensate tank is provided with a condensate A inlet, a condensate B inlet and a non-condensable gas outlet; the lower part of the alkali liquor absorption tower is provided with a non-condensable gas inlet and an alkali liquor circulating outlet, the top part of the alkali liquor absorption tower is provided with an alkali liquor circulating inlet and an external discharge valve; the lower part of the alkali liquor preparation tank is provided with an alkali liquor supply outlet; the control valve comprises a first valve, a second valve, a third valve and a fourth valve; the pipelines comprise a tail gas inlet pipeline, a tail gas condensation A pipeline, a tail gas condensation B pipeline, a refrigerant conveying A pipeline, a refrigerant conveying B pipeline, a non-condensable gas pipeline, an alkali liquor circulating pipeline and an alkali liquor supply pipeline; the tail gas inlet pipeline is divided into a branch line A leading to an air inlet A and a branch line B leading to an air inlet B, a first valve is arranged on the branch line A, and a second valve is arranged on the branch line B; the tail gas condensation A pipeline and the refrigerant conveying A pipeline are sequentially connected with the group A primary condenser, the group A secondary condenser and the group A tertiary condenser in series in a mode that the tail gas condensation A pipeline and the refrigerant conveying A pipeline enter and exit the condensers in an oblique and diagonal manner, the initial end of the tail gas condensation A pipeline is connected with the gas outlet A port, and the tail end of the tail gas condensation A pipeline is connected with the condensate A inlet; the tail gas condensation B pipeline and the refrigerant conveying B pipeline are connected with the group B first-stage condenser, the group B second-stage condenser and the group B third-stage condenser in series in sequence in a mode that the tail gas condensation B pipeline and the refrigerant conveying B pipeline enter and exit the condensers in an inclined diagonal manner, the initial end of the tail gas condensation B pipeline is connected with a gas outlet B port, and the tail end of the tail gas condensation B pipeline is connected with a condensate B inlet; the initial end of the non-condensable gas pipeline is connected with a non-condensable gas outlet, and the tail end of the non-condensable gas pipeline is connected with a non-condensable gas inlet; the lower end of the alkali liquor circulating pipeline is connected with an alkali liquor circulating outlet, the upper end of the alkali liquor circulating pipeline is connected with an alkali liquor circulating inlet, and a third valve and an alkali liquor circulating pump are sequentially connected in series on the circuit; the initial end of the alkali liquor supply pipeline is connected with an alkali liquor supply outlet, the tail end of the alkali liquor supply pipeline is connected with an alkali liquor circulating pipeline and is positioned between the third valve and the alkali liquor circulating pump, and the fourth valve and the alkali liquor conveying pump are sequentially connected in series on the circuit.
The technical scheme is further optimized as follows:
the A group of first-stage condensers, the A group of second-stage condensers, the A group of third-stage condensers, the B group of first-stage condensers, the B group of second-stage condensers and the B group of third-stage condensers are all shell-tube condensers.
The alkali liquor absorption tower adopts a packed tower.
The packing of the packed tower is made of polypropylene.
The alkali liquor delivery pump and the alkali liquor circulating pump adopt fluorine-lined centrifugal pumps.
And the third valve and the fourth valve are made of stainless steel.
Compared with the prior art, the utility model discloses mainly have following beneficial technological effect:
1. the tail gas is comprehensively treated by adopting a method combining condensation recovery and alkali liquor absorption, so that the final emission of the tail gas completely reaches the standard, and the method has good environmental protection benefit.
2. The phosgene in the tail gas is intensively recycled by adopting a mode of connecting three grades of condensers in series, so that conditions are created for recycling the phosgene, and the method has good economic benefit.
3. Two sets of temporary storage and condensation mechanisms are adopted, so that the tail gas treatment device can be used at the same time or used at one time, the load of the tail gas treatment device is reduced, and the flexibility and the stability of the operation of the device are ensured.
4. Reasonable structure, simple operation, durability and convenient popularization.
Drawings
FIG. 1 is a schematic view of the structure layout and basic flow of the present invention;
in the figure: 1-tail gas inlet pipeline, 2-second valve, 3-gas inlet B port, 4-B branch line, 5-A branch line, 6-first valve, 7-gas inlet A port, 8-gas outlet A port, 9-tail gas condensation A pipeline, 10-refrigerant conveying A pipeline, 11-A group primary condenser, 12-A group secondary condenser, 13-A group tertiary condenser, 14-tail gas buffer A tank, 15-gas outlet B port, 16-tail gas condensation B pipeline, 17-refrigerant conveying B pipeline, 18-tail gas buffer B tank, 19-B group primary condenser, 20-B group secondary condenser, 21-B group tertiary condenser, 22-condensate B inlet, 23-condensate A inlet, 24-noncondensable gas pipeline and 25-noncondensable gas inlet, 26-an alkali liquor absorption tower, 27-an alkali liquor circulating inlet, 28-an alkali liquor circulating pipeline, 29-an alkali liquor circulating outlet, 30-an alkali liquor circulating pump, 31-a non-condensable gas outlet, 32-a third valve, 33-an alkali liquor supply pipeline, 34-an alkali liquor conveying pump, 35-a fourth valve, 36-an alkali liquor supply outlet, 37-an alkali liquor preparation tank, 38-a condensate tank and 39-an external discharge valve.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and accompanying drawings.
Example 1
See fig. 1. The comprehensive dichloroacetyl chloride tail gas recovery and treatment device comprises a tail gas buffer A tank 14, a tail gas buffer B tank 18, a condensation A group, a condensation B group, a condensate tank 38, an alkali liquor absorption tower 26, an alkali liquor preparation tank 37, an alkali liquor delivery pump 34, an alkali liquor circulating pump 30, a pipeline and a control valve. The condensation A group comprises a group A first-stage condenser 11, a group A second-stage condenser 12 and a group A third-stage condenser 13. The condensation group B comprises a group B first-stage condenser 19, a group B second-stage condenser 20 and a group B third-stage condenser 21. The lower part of the tail gas buffer A tank 14 is provided with an air inlet A port 7, and the top part is provided with an air outlet A port 8. The lower part of the tail gas buffer B tank 18 is provided with an air inlet B port 3, and the top part is provided with an air outlet B port 15. The top of the condensate tank 38 is provided with a condensate A inlet 23, a condensate B inlet 22 and a non-condensable gas outlet 31. The lower part of the alkali liquor absorption tower 26 is provided with a non-condensable gas inlet 25 and an alkali liquor circulating outlet 29, the top part is provided with an alkali liquor circulating inlet 27 and an external discharge valve 39. The lower part of the lye preparation tank 37 is provided with a lye supply outlet 36. The control valves include a first valve 6, a second valve 2, a third valve 32, and a fourth valve 35. The pipelines comprise a tail gas inlet pipeline 1, a tail gas condensation A pipeline 9, a tail gas condensation B pipeline 16, a refrigerant conveying A pipeline 10, a refrigerant conveying B pipeline 17, a non-condensable gas pipeline 24, an alkali liquor circulating pipeline 28 and an alkali liquor supply pipeline 33. The exhaust gas inlet line 1 is divided into an A branch line 5 leading to an inlet A port 7 and a B branch line 4 leading to an inlet B port 3, the A branch line 5 is provided with a first valve 6, and the B branch line 4 is provided with a second valve 2. The tail gas condensation A pipeline 9 and the refrigerant conveying A pipeline 10 are connected with the group A first-stage condenser 11, the group A second-stage condenser 12 and the group A third-stage condenser 13 in series in sequence in a mode that the tail gas condensation A pipeline 9 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation A pipeline 9 is connected with the gas outlet A port 8, and the tail end of the tail gas condensation A pipeline is connected with the condensate A inlet 23. The tail gas condensation B pipeline 16 and the refrigerant conveying B pipeline 17 are connected with the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 in series in sequence in a mode that the tail gas condensation B pipeline 16 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation B pipeline 16 is connected with the gas outlet B port 15, and the tail end of the tail gas condensation B pipeline is connected with the condensate B inlet 22. The initial end of the non-condensable gas pipeline 24 is connected with a non-condensable gas outlet 31, and the tail end of the non-condensable gas pipeline is connected with a non-condensable gas inlet 25. The lower end of the alkali liquor circulating pipeline 28 is connected with an alkali liquor circulating outlet 29, the upper end is connected with an alkali liquor circulating inlet 27, and a third valve 32 and an alkali liquor circulating pump 30 are sequentially connected in series on the circuit. The initial end of the alkali liquor supply pipeline 33 is connected with an alkali liquor supply outlet 36, the tail end is connected with the alkali liquor circulating pipeline 28 and is positioned between the third valve 32 and the alkali liquor circulating pump 30, and the circuit is sequentially connected with the fourth valve 35 and the alkali liquor conveying pump 34 in series.
Example 2
See fig. 1. The comprehensive dichloroacetyl chloride tail gas recovery and treatment device comprises a tail gas buffer A tank 14, a tail gas buffer B tank 18, a condensation A group, a condensation B group, a condensate tank 38, an alkali liquor absorption tower 26, an alkali liquor preparation tank 37, an alkali liquor delivery pump 34, an alkali liquor circulating pump 30, a pipeline and a control valve. The condensation A group comprises a group A first-stage condenser 11, a group A second-stage condenser 12 and a group A third-stage condenser 13. The condensation group B comprises a group B first-stage condenser 19, a group B second-stage condenser 20 and a group B third-stage condenser 21. The lower part of the tail gas buffer A tank 14 is provided with an air inlet A port 7, and the top part is provided with an air outlet A port 8. The lower part of the tail gas buffer B tank 18 is provided with an air inlet B port 3, and the top part is provided with an air outlet B port 15. The top of the condensate tank 38 is provided with a condensate A inlet 23, a condensate B inlet 22 and a non-condensable gas outlet 31. The lower part of the alkali liquor absorption tower 26 is provided with a non-condensable gas inlet 25 and an alkali liquor circulating outlet 29, the top part is provided with an alkali liquor circulating inlet 27 and an external discharge valve 39. The lower part of the lye preparation tank 37 is provided with a lye supply outlet 36. The control valves include a first valve 6, a second valve 2, a third valve 32, and a fourth valve 35. The pipelines comprise a tail gas inlet pipeline 1, a tail gas condensation A pipeline 9, a tail gas condensation B pipeline 16, a refrigerant conveying A pipeline 10, a refrigerant conveying B pipeline 17, a non-condensable gas pipeline 24, an alkali liquor circulating pipeline 28 and an alkali liquor supply pipeline 33. The exhaust gas inlet line 1 is divided into an A branch line 5 leading to an inlet A port 7 and a B branch line 4 leading to an inlet B port 3, the A branch line 5 is provided with a first valve 6, and the B branch line 4 is provided with a second valve 2. The tail gas condensation A pipeline 9 and the refrigerant conveying A pipeline 10 are connected with the group A first-stage condenser 11, the group A second-stage condenser 12 and the group A third-stage condenser 13 in series in sequence in a mode that the tail gas condensation A pipeline 9 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation A pipeline 9 is connected with the gas outlet A port 8, and the tail end of the tail gas condensation A pipeline is connected with the condensate A inlet 23. The tail gas condensation B pipeline 16 and the refrigerant conveying B pipeline 17 are connected with the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 in series in sequence in a mode that the tail gas condensation B pipeline 16 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation B pipeline 16 is connected with the gas outlet B port 15, and the tail end of the tail gas condensation B pipeline is connected with the condensate B inlet 22. The initial end of the non-condensable gas pipeline 24 is connected with a non-condensable gas outlet 31, and the tail end of the non-condensable gas pipeline is connected with a non-condensable gas inlet 25. The lower end of the alkali liquor circulating pipeline 28 is connected with an alkali liquor circulating outlet 29, the upper end is connected with an alkali liquor circulating inlet 27, and a third valve 32 and an alkali liquor circulating pump 30 are sequentially connected in series on the circuit. The initial end of the alkali liquor supply pipeline 33 is connected with an alkali liquor supply outlet 36, the tail end is connected with the alkali liquor circulating pipeline 28 and is positioned between the third valve 32 and the alkali liquor circulating pump 30, and the circuit is sequentially connected with the fourth valve 35 and the alkali liquor conveying pump 34 in series.
The group A first-stage condenser 11, the group A second-stage condenser 12, the group A third-stage condenser 13, the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 are all shell-tube condensers, the tail gas passes through a tube side, and the refrigerant passes through the shell side.
Example 3
See fig. 1. The comprehensive dichloroacetyl chloride tail gas recovery and treatment device comprises a tail gas buffer A tank 14, a tail gas buffer B tank 18, a condensation A group, a condensation B group, a condensate tank 38, an alkali liquor absorption tower 26, an alkali liquor preparation tank 37, an alkali liquor delivery pump 34, an alkali liquor circulating pump 30, a pipeline and a control valve. The condensation A group comprises a group A first-stage condenser 11, a group A second-stage condenser 12 and a group A third-stage condenser 13. The condensation group B comprises a group B first-stage condenser 19, a group B second-stage condenser 20 and a group B third-stage condenser 21. The lower part of the tail gas buffer A tank 14 is provided with an air inlet A port 7, and the top part is provided with an air outlet A port 8. The lower part of the tail gas buffer B tank 18 is provided with an air inlet B port 3, and the top part is provided with an air outlet B port 15. The top of the condensate tank 38 is provided with a condensate A inlet 23, a condensate B inlet 22 and a non-condensable gas outlet 31. The lower part of the alkali liquor absorption tower 26 is provided with a non-condensable gas inlet 25 and an alkali liquor circulating outlet 29, the top part is provided with an alkali liquor circulating inlet 27 and an external discharge valve 39. The lower part of the lye preparation tank 37 is provided with a lye supply outlet 36. The control valves include a first valve 6, a second valve 2, a third valve 32, and a fourth valve 35. The pipelines comprise a tail gas inlet pipeline 1, a tail gas condensation A pipeline 9, a tail gas condensation B pipeline 16, a refrigerant conveying A pipeline 10, a refrigerant conveying B pipeline 17, a non-condensable gas pipeline 24, an alkali liquor circulating pipeline 28 and an alkali liquor supply pipeline 33. The exhaust gas inlet line 1 is divided into an A branch line 5 leading to an inlet A port 7 and a B branch line 4 leading to an inlet B port 3, the A branch line 5 is provided with a first valve 6, and the B branch line 4 is provided with a second valve 2. The tail gas condensation A pipeline 9 and the refrigerant conveying A pipeline 10 are connected with the group A first-stage condenser 11, the group A second-stage condenser 12 and the group A third-stage condenser 13 in series in sequence in a mode that the tail gas condensation A pipeline 9 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation A pipeline 9 is connected with the gas outlet A port 8, and the tail end of the tail gas condensation A pipeline is connected with the condensate A inlet 23. The tail gas condensation B pipeline 16 and the refrigerant conveying B pipeline 17 are connected with the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 in series in sequence in a mode that the tail gas condensation B pipeline 16 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation B pipeline 16 is connected with the gas outlet B port 15, and the tail end of the tail gas condensation B pipeline is connected with the condensate B inlet 22. The initial end of the non-condensable gas pipeline 24 is connected with a non-condensable gas outlet 31, and the tail end of the non-condensable gas pipeline is connected with a non-condensable gas inlet 25. The lower end of the alkali liquor circulating pipeline 28 is connected with an alkali liquor circulating outlet 29, the upper end is connected with an alkali liquor circulating inlet 27, and a third valve 32 and an alkali liquor circulating pump 30 are sequentially connected in series on the circuit. The initial end of the alkali liquor supply pipeline 33 is connected with an alkali liquor supply outlet 36, the tail end is connected with the alkali liquor circulating pipeline 28 and is positioned between the third valve 32 and the alkali liquor circulating pump 30, and the circuit is sequentially connected with the fourth valve 35 and the alkali liquor conveying pump 34 in series.
The group A first-stage condenser 11, the group A second-stage condenser 12, the group A third-stage condenser 13, the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 are all shell-tube condensers, the tail gas passes through a tube side, and the refrigerant passes through the shell side. The alkali liquid absorption tower 26 adopts a packed tower.
Example 4
See fig. 1. The comprehensive dichloroacetyl chloride tail gas recovery and treatment device comprises a tail gas buffer A tank 14, a tail gas buffer B tank 18, a condensation A group, a condensation B group, a condensate tank 38, an alkali liquor absorption tower 26, an alkali liquor preparation tank 37, an alkali liquor delivery pump 34, an alkali liquor circulating pump 30, a pipeline and a control valve. The condensation A group comprises a group A first-stage condenser 11, a group A second-stage condenser 12 and a group A third-stage condenser 13. The condensation group B comprises a group B first-stage condenser 19, a group B second-stage condenser 20 and a group B third-stage condenser 21. The lower part of the tail gas buffer A tank 14 is provided with an air inlet A port 7, and the top part is provided with an air outlet A port 8. The lower part of the tail gas buffer B tank 18 is provided with an air inlet B port 3, and the top part is provided with an air outlet B port 15. The top of the condensate tank 38 is provided with a condensate A inlet 23, a condensate B inlet 22 and a non-condensable gas outlet 31. The lower part of the alkali liquor absorption tower 26 is provided with a non-condensable gas inlet 25 and an alkali liquor circulating outlet 29, the top part is provided with an alkali liquor circulating inlet 27 and an external discharge valve 39. The lower part of the lye preparation tank 37 is provided with a lye supply outlet 36. The control valves include a first valve 6, a second valve 2, a third valve 32, and a fourth valve 35. The pipelines comprise a tail gas inlet pipeline 1, a tail gas condensation A pipeline 9, a tail gas condensation B pipeline 16, a refrigerant conveying A pipeline 10, a refrigerant conveying B pipeline 17, a non-condensable gas pipeline 24, an alkali liquor circulating pipeline 28 and an alkali liquor supply pipeline 33. The exhaust gas inlet line 1 is divided into an A branch line 5 leading to an inlet A port 7 and a B branch line 4 leading to an inlet B port 3, the A branch line 5 is provided with a first valve 6, and the B branch line 4 is provided with a second valve 2. The tail gas condensation A pipeline 9 and the refrigerant conveying A pipeline 10 are connected with the group A first-stage condenser 11, the group A second-stage condenser 12 and the group A third-stage condenser 13 in series in sequence in a mode that the tail gas condensation A pipeline 9 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation A pipeline 9 is connected with the gas outlet A port 8, and the tail end of the tail gas condensation A pipeline is connected with the condensate A inlet 23. The tail gas condensation B pipeline 16 and the refrigerant conveying B pipeline 17 are connected with the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 in series in sequence in a mode that the tail gas condensation B pipeline 16 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation B pipeline 16 is connected with the gas outlet B port 15, and the tail end of the tail gas condensation B pipeline is connected with the condensate B inlet 22. The initial end of the non-condensable gas pipeline 24 is connected with a non-condensable gas outlet 31, and the tail end of the non-condensable gas pipeline is connected with a non-condensable gas inlet 25. The lower end of the alkali liquor circulating pipeline 28 is connected with an alkali liquor circulating outlet 29, the upper end is connected with an alkali liquor circulating inlet 27, and a third valve 32 and an alkali liquor circulating pump 30 are sequentially connected in series on the circuit. The initial end of the alkali liquor supply pipeline 33 is connected with an alkali liquor supply outlet 36, the tail end is connected with the alkali liquor circulating pipeline 28 and is positioned between the third valve 32 and the alkali liquor circulating pump 30, and the circuit is sequentially connected with the fourth valve 35 and the alkali liquor conveying pump 34 in series.
The group A first-stage condenser 11, the group A second-stage condenser 12, the group A third-stage condenser 13, the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 are all shell-tube condensers, the tail gas passes through a tube side, and the refrigerant passes through the shell side. The alkali absorption tower 26 adopts a packed tower, and the packing is made of polypropylene material to enhance the corrosion resistance.
Example 5
See fig. 1. The comprehensive dichloroacetyl chloride tail gas recovery and treatment device comprises a tail gas buffer A tank 14, a tail gas buffer B tank 18, a condensation A group, a condensation B group, a condensate tank 38, an alkali liquor absorption tower 26, an alkali liquor preparation tank 37, an alkali liquor delivery pump 34, an alkali liquor circulating pump 30, a pipeline and a control valve. The condensation A group comprises a group A first-stage condenser 11, a group A second-stage condenser 12 and a group A third-stage condenser 13. The condensation group B comprises a group B first-stage condenser 19, a group B second-stage condenser 20 and a group B third-stage condenser 21. The lower part of the tail gas buffer A tank 14 is provided with an air inlet A port 7, and the top part is provided with an air outlet A port 8. The lower part of the tail gas buffer B tank 18 is provided with an air inlet B port 3, and the top part is provided with an air outlet B port 15. The top of the condensate tank 38 is provided with a condensate A inlet 23, a condensate B inlet 22 and a non-condensable gas outlet 31. The lower part of the alkali liquor absorption tower 26 is provided with a non-condensable gas inlet 25 and an alkali liquor circulating outlet 29, the top part is provided with an alkali liquor circulating inlet 27 and an external discharge valve 39. The lower part of the lye preparation tank 37 is provided with a lye supply outlet 36. The control valves include a first valve 6, a second valve 2, a third valve 32, and a fourth valve 35. The pipelines comprise a tail gas inlet pipeline 1, a tail gas condensation A pipeline 9, a tail gas condensation B pipeline 16, a refrigerant conveying A pipeline 10, a refrigerant conveying B pipeline 17, a non-condensable gas pipeline 24, an alkali liquor circulating pipeline 28 and an alkali liquor supply pipeline 33. The exhaust gas inlet line 1 is divided into an A branch line 5 leading to an inlet A port 7 and a B branch line 4 leading to an inlet B port 3, the A branch line 5 is provided with a first valve 6, and the B branch line 4 is provided with a second valve 2. The tail gas condensation A pipeline 9 and the refrigerant conveying A pipeline 10 are connected with the group A first-stage condenser 11, the group A second-stage condenser 12 and the group A third-stage condenser 13 in series in sequence in a mode that the tail gas condensation A pipeline 9 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation A pipeline 9 is connected with the gas outlet A port 8, and the tail end of the tail gas condensation A pipeline is connected with the condensate A inlet 23. The tail gas condensation B pipeline 16 and the refrigerant conveying B pipeline 17 are connected with the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 in series in sequence in a mode that the tail gas condensation B pipeline 16 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation B pipeline 16 is connected with the gas outlet B port 15, and the tail end of the tail gas condensation B pipeline is connected with the condensate B inlet 22. The initial end of the non-condensable gas pipeline 24 is connected with a non-condensable gas outlet 31, and the tail end of the non-condensable gas pipeline is connected with a non-condensable gas inlet 25. The lower end of the alkali liquor circulating pipeline 28 is connected with an alkali liquor circulating outlet 29, the upper end is connected with an alkali liquor circulating inlet 27, and a third valve 32 and an alkali liquor circulating pump 30 are sequentially connected in series on the circuit. The initial end of the alkali liquor supply pipeline 33 is connected with an alkali liquor supply outlet 36, the tail end is connected with the alkali liquor circulating pipeline 28 and is positioned between the third valve 32 and the alkali liquor circulating pump 30, and the circuit is sequentially connected with the fourth valve 35 and the alkali liquor conveying pump 34 in series.
The group A first-stage condenser 11, the group A second-stage condenser 12, the group A third-stage condenser 13, the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 are all shell-tube condensers, the tail gas passes through a tube side, and the refrigerant passes through the shell side. The alkali liquid absorption tower 26 adopts a packed tower. In order to enhance the corrosion resistance, the filler of the packed tower is made of polypropylene, and the alkali liquor delivery pump 34 and the alkali liquor circulating pump 30 are fluorine-lined centrifugal pumps.
Example 6
See fig. 1. The comprehensive dichloroacetyl chloride tail gas recovery and treatment device comprises a tail gas buffer A tank 14, a tail gas buffer B tank 18, a condensation A group, a condensation B group, a condensate tank 38, an alkali liquor absorption tower 26, an alkali liquor preparation tank 37, an alkali liquor delivery pump 34, an alkali liquor circulating pump 30, a pipeline and a control valve. The condensation A group comprises a group A first-stage condenser 11, a group A second-stage condenser 12 and a group A third-stage condenser 13. The condensation group B comprises a group B first-stage condenser 19, a group B second-stage condenser 20 and a group B third-stage condenser 21. The lower part of the tail gas buffer A tank 14 is provided with an air inlet A port 7, and the top part is provided with an air outlet A port 8. The lower part of the tail gas buffer B tank 18 is provided with an air inlet B port 3, and the top part is provided with an air outlet B port 15. The top of the condensate tank 38 is provided with a condensate A inlet 23, a condensate B inlet 22 and a non-condensable gas outlet 31. The lower part of the alkali liquor absorption tower 26 is provided with a non-condensable gas inlet 25 and an alkali liquor circulating outlet 29, the top part is provided with an alkali liquor circulating inlet 27 and an external discharge valve 39. The lower part of the lye preparation tank 37 is provided with a lye supply outlet 36. The control valves include a first valve 6, a second valve 2, a third valve 32, and a fourth valve 35. The pipelines comprise a tail gas inlet pipeline 1, a tail gas condensation A pipeline 9, a tail gas condensation B pipeline 16, a refrigerant conveying A pipeline 10, a refrigerant conveying B pipeline 17, a non-condensable gas pipeline 24, an alkali liquor circulating pipeline 28 and an alkali liquor supply pipeline 33. The exhaust gas inlet line 1 is divided into an A branch line 5 leading to an inlet A port 7 and a B branch line 4 leading to an inlet B port 3, the A branch line 5 is provided with a first valve 6, and the B branch line 4 is provided with a second valve 2. The tail gas condensation A pipeline 9 and the refrigerant conveying A pipeline 10 are connected with the group A first-stage condenser 11, the group A second-stage condenser 12 and the group A third-stage condenser 13 in series in sequence in a mode that the tail gas condensation A pipeline 9 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation A pipeline 9 is connected with the gas outlet A port 8, and the tail end of the tail gas condensation A pipeline is connected with the condensate A inlet 23. The tail gas condensation B pipeline 16 and the refrigerant conveying B pipeline 17 are connected with the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 in series in sequence in a mode that the tail gas condensation B pipeline 16 enters and exits the condensers in an inclined diagonal mode, the starting end of the tail gas condensation B pipeline 16 is connected with the gas outlet B port 15, and the tail end of the tail gas condensation B pipeline is connected with the condensate B inlet 22. The initial end of the non-condensable gas pipeline 24 is connected with a non-condensable gas outlet 31, and the tail end of the non-condensable gas pipeline is connected with a non-condensable gas inlet 25. The lower end of the alkali liquor circulating pipeline 28 is connected with an alkali liquor circulating outlet 29, the upper end is connected with an alkali liquor circulating inlet 27, and a third valve 32 and an alkali liquor circulating pump 30 are sequentially connected in series on the circuit. The initial end of the alkali liquor supply pipeline 33 is connected with an alkali liquor supply outlet 36, the tail end is connected with the alkali liquor circulating pipeline 28 and is positioned between the third valve 32 and the alkali liquor circulating pump 30, and the circuit is sequentially connected with the fourth valve 35 and the alkali liquor conveying pump 34 in series.
The group A first-stage condenser 11, the group A second-stage condenser 12, the group A third-stage condenser 13, the group B first-stage condenser 19, the group B second-stage condenser 20 and the group B third-stage condenser 21 are all shell-tube condensers, the tail gas passes through a tube side, and the refrigerant passes through the shell side. The alkali liquid absorption tower 26 adopts a packed tower. In order to enhance the corrosion resistance, the filler of the packed tower is made of polypropylene, the alkali liquor delivery pump 34 and the alkali liquor circulating pump 30 are made of fluorine-lined centrifugal pumps, and the third valve 32 and the fourth valve 35 are made of stainless steel.
The basic working principle of the utility model is as follows:
tail gas (phosgene and hydrogen chloride) generated by the synthetic reaction of dichloroacetyl chloride firstly enters a tail gas buffer A tank 14 or a tail gas buffer B tank 18 to be naturally cooled, and then enters a corresponding condensation group A or a corresponding condensation group B to be condensed; when the amount is large, the tail gas enters the tail gas buffering A tank 14 and the tail gas buffering B tank 18 at the same time, and then enters the corresponding condensation A group and condensation B group for condensation. The condensation A group and the condensation B group are three-level condensation combination, the condensation temperature of the first-level condenser is-15 ℃, the condensation temperature of the second-level condenser is-45 ℃, the condensation temperature of the third-level condenser is-60 ℃, and the refrigerant is evaporated by liquid ammonia (after absorbing heat). As the liquefaction temperature of the phosgene is 8.2 ℃ and the liquefaction temperature of the hydrogen chloride is-85 ℃, the condensate entering the condensate tank 38 is the phosgene condensate, and can be completely used as a pure phosgene resource for corresponding reutilization. The non-condensable gas from the condensate tank 38 is hydrogen chloride and a small amount of residual phosgene, most of the non-condensable gas is absorbed by alkali liquor (sodium hydroxide solution) in the alkali liquor absorption tower 26 and converted into salts (sodium chloride and a small amount of sodium carbonate), and the few non-condensable gas remained after the absorption by the alkali liquor reaches the standard and is discharged through an external discharge valve 39.
Claims (6)
1. Dichloroacetyl chloride tail gas comprehensive recovery processing device, its characterized in that: comprises a tail gas buffer A tank, a tail gas buffer B tank, a condensation A group, a condensation B group, a condensate tank, an alkali liquor absorption tower, an alkali liquor preparation tank, an alkali liquor delivery pump, an alkali liquor circulating pump, a pipeline and a control valve; the condensation A group comprises a group A first-stage condenser, a group A second-stage condenser and a group A third-stage condenser; the condensation group B comprises a group B first-stage condenser, a group B second-stage condenser and a group B third-stage condenser; the lower part of the tail gas buffer A tank is provided with an air inlet A, and the top of the tail gas buffer A tank is provided with an air outlet A; the lower part of the tail gas buffer B tank is provided with an air inlet B port, and the top of the tail gas buffer B tank is provided with an air outlet B port; the top of the condensate tank is provided with a condensate A inlet, a condensate B inlet and a non-condensable gas outlet; the lower part of the alkali liquor absorption tower is provided with a non-condensable gas inlet and an alkali liquor circulating outlet, the top part of the alkali liquor absorption tower is provided with an alkali liquor circulating inlet and an external discharge valve; the lower part of the alkali liquor preparation tank is provided with an alkali liquor supply outlet; the control valve comprises a first valve, a second valve, a third valve and a fourth valve; the pipelines comprise a tail gas inlet pipeline, a tail gas condensation A pipeline, a tail gas condensation B pipeline, a refrigerant conveying A pipeline, a refrigerant conveying B pipeline, a non-condensable gas pipeline, an alkali liquor circulating pipeline and an alkali liquor supply pipeline; the tail gas inlet pipeline is divided into a branch line A leading to an air inlet A and a branch line B leading to an air inlet B, a first valve is arranged on the branch line A, and a second valve is arranged on the branch line B; the tail gas condensation A pipeline and the refrigerant conveying A pipeline are sequentially connected with the group A primary condenser, the group A secondary condenser and the group A tertiary condenser in series in a mode that the tail gas condensation A pipeline and the refrigerant conveying A pipeline enter and exit the condensers in an oblique and diagonal manner, the initial end of the tail gas condensation A pipeline is connected with the gas outlet A port, and the tail end of the tail gas condensation A pipeline is connected with the condensate A inlet; the tail gas condensation B pipeline and the refrigerant conveying B pipeline are connected with the group B first-stage condenser, the group B second-stage condenser and the group B third-stage condenser in series in sequence in a mode that the tail gas condensation B pipeline and the refrigerant conveying B pipeline enter and exit the condensers in an inclined diagonal manner, the initial end of the tail gas condensation B pipeline is connected with a gas outlet B port, and the tail end of the tail gas condensation B pipeline is connected with a condensate B inlet; the initial end of the non-condensable gas pipeline is connected with a non-condensable gas outlet, and the tail end of the non-condensable gas pipeline is connected with a non-condensable gas inlet; the lower end of the alkali liquor circulating pipeline is connected with an alkali liquor circulating outlet, the upper end of the alkali liquor circulating pipeline is connected with an alkali liquor circulating inlet, and a third valve and an alkali liquor circulating pump are sequentially connected in series on the circuit; the initial end of the alkali liquor supply pipeline is connected with an alkali liquor supply outlet, the tail end of the alkali liquor supply pipeline is connected with an alkali liquor circulating pipeline and is positioned between the third valve and the alkali liquor circulating pump, and the fourth valve and the alkali liquor conveying pump are sequentially connected in series on the circuit.
2. The dichloroacetyl chloride tail gas comprehensive recovery and treatment device according to claim 1, characterized in that: the A group of first-stage condensers, the A group of second-stage condensers, the A group of third-stage condensers, the B group of first-stage condensers, the B group of second-stage condensers and the B group of third-stage condensers are all shell-tube condensers.
3. The dichloroacetyl chloride tail gas comprehensive recovery and treatment device according to claim 2, characterized in that: the alkali liquor absorption tower adopts a packed tower.
4. The dichloroacetyl chloride tail gas comprehensive recovery and treatment device according to claim 3, characterized in that: the packing of the packed tower is made of polypropylene.
5. The dichloroacetyl chloride tail gas comprehensive recovery and treatment device according to claim 4, characterized in that: the alkali liquor delivery pump and the alkali liquor circulating pump adopt fluorine-lined centrifugal pumps.
6. The dichloroacetyl chloride tail gas comprehensive recovery and treatment device according to claim 5, characterized in that: and the third valve and the fourth valve are made of stainless steel.
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Denomination of utility model: Comprehensive recovery and treatment unit for tail gas of dichloroacetyl chloride Effective date of registration: 20221110 Granted publication date: 20201027 Pledgee: Shandong Guangrao Rural Commercial Bank Co.,Ltd. Pledgor: DONGYING YINQIAO CHEMICAL Co.,Ltd. Registration number: Y2022980021398 |
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Date of cancellation: 20231130 Granted publication date: 20201027 Pledgee: Shandong Guangrao Rural Commercial Bank Co.,Ltd. Pledgor: DONGYING YINQIAO CHEMICAL Co.,Ltd. Registration number: Y2022980021398 |
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