CN115487667B - Tail gas absorption process for caramel color production by common method - Google Patents
Tail gas absorption process for caramel color production by common method Download PDFInfo
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- CN115487667B CN115487667B CN202211122632.6A CN202211122632A CN115487667B CN 115487667 B CN115487667 B CN 115487667B CN 202211122632 A CN202211122632 A CN 202211122632A CN 115487667 B CN115487667 B CN 115487667B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 239000000940 FEMA 2235 Substances 0.000 title claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 239000000243 solution Substances 0.000 claims abstract description 29
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 27
- 239000005416 organic matter Substances 0.000 claims abstract description 26
- 239000007864 aqueous solution Substances 0.000 claims abstract description 15
- 150000007524 organic acids Chemical class 0.000 claims abstract description 11
- 238000006482 condensation reaction Methods 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 19
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 claims description 14
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 claims description 14
- SRBFZHDQGSBBOR-IOVATXLUSA-N Xylose Natural products O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 claims description 10
- PYMYPHUHKUWMLA-WDCZJNDASA-N arabinose Chemical group OC[C@@H](O)[C@@H](O)[C@H](O)C=O PYMYPHUHKUWMLA-WDCZJNDASA-N 0.000 claims description 6
- 125000000969 xylosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)CO1)* 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 9
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 8
- 125000003172 aldehyde group Chemical group 0.000 abstract description 6
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 abstract description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 5
- 230000002378 acidificating effect Effects 0.000 abstract description 2
- 238000000710 polymer precipitation Methods 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 description 6
- 239000013049 sediment Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- HSJKGGMUJITCBW-UHFFFAOYSA-N 3-hydroxybutanal Chemical group CC(O)CC=O HSJKGGMUJITCBW-UHFFFAOYSA-N 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- NOEGNKMFWQHSLB-UHFFFAOYSA-N 5-hydroxymethylfurfural Chemical compound OCC1=CC=C(C=O)O1 NOEGNKMFWQHSLB-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- RJGBSYZFOCAGQY-UHFFFAOYSA-N hydroxymethylfurfural Natural products COC1=CC=C(C=O)O1 RJGBSYZFOCAGQY-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PJVXUVWGSCCGHT-ZPYZYFCMSA-N (2r,3s,4r,5r)-2,3,4,5,6-pentahydroxyhexanal;(3s,4r,5r)-1,3,4,5,6-pentahydroxyhexan-2-one Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O.OC[C@@H](O)[C@@H](O)[C@H](O)C(=O)CO PJVXUVWGSCCGHT-ZPYZYFCMSA-N 0.000 description 1
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 150000001241 acetals Chemical class 0.000 description 1
- 238000005882 aldol condensation reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000000089 arabinosyl group Chemical group C1([C@@H](O)[C@H](O)[C@H](O)CO1)* 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000021433 fructose syrup Nutrition 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 150000002373 hemiacetals Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B61/00—Dyes of natural origin prepared from natural sources, e.g. vegetable sources
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a tail gas absorption process for caramel color production by a common method, which comprises the following steps of: pumping tail gas in the reaction kettle into a first absorption tank A containing an aqueous solution of an organic matter E by a Roots pump, so that the tail gas and the added organic matter E are subjected to condensation reaction and absorbed; a small amount of organic acid escaping from the first absorption tank a is introduced into the second absorption tank B containing the soda solution along with the steam, so that the acid gas is also completely absorbed, and only the steam is discharged from the second absorption tank B to the atmosphere. The invention utilizes harmless organic matters containing a large amount of aldehyde groups and/or hydroxyl groups to be absorbed by condensation reaction with organic matters such as furfural and the like under the acidic and high-temperature conditions of aqueous solution, and does not generate polymer precipitation; the volatile small amount of organic acid is absorbed by sodium carbonate. The whole absorbed solution can be used as a raw material in the reaction production process of caramel color by an ammonium sulfite method, so that the tail gas produced by caramel color by a common method is completely absorbed and utilized, and the method has no influence on the atmospheric environment.
Description
Technical Field
The invention relates to a tail gas absorption process for caramel color production by a common method.
Background
The caramel color produced by the common method is that the fructose syrup is utilized to carry out caramelization reaction under the catalysis of a trace of sour agent. In the dehydration process of heating and boiling under normal pressure, high fructose glucose is continuously dehydrated, condensed, cracked, oxidized and the like to generate a great amount of complex caramelization reaction of organic acids such as 5-hydroxymethyl furfural (HMF), malonic acid and the like, and the substances have strong volatility at a high temperature of 130-200 ℃, form mixed tail gas together with dehydrated steam and are discharged out of a reaction kettle, and can be discharged into the atmosphere after being treated due to strong nasal choking taste and acid gas. In the production process, strong alkaline solution of sodium carbonate or liquid alkali with the mass concentration of 10% is added into a tail gas absorption tank to participate in reaction absorption, but the product is easy to undergo polymerization reaction under the conditions of strong alkalinity, long time and high temperature (the temperature of the absorption liquid of superheated steam is 100-102 ℃), so that a large amount of blackish brown resin-like water insoluble matters are generated, the post-treatment is difficult, the recovery and the environmental protection are not realized, and the environment protection is influenced. Particularly, a clean process for absorbing tail gas needs to be developed, so that the tail gas in the production process can be recycled after being absorbed, and the problems that the post treatment is difficult, the recycling is impossible and the environmental protection is affected are solved.
Disclosure of Invention
The invention aims to solve the defects that the mixed tail gas generated in the production of caramel color by a common method in the background technology and a product of a strong alkaline solution are subjected to polymerization reaction to generate a large amount of blackish brown resin-like water insoluble substances, the treatment is difficult, the recovery and the utilization are impossible, the environmental protection are affected and the like, and provides a tail gas recovery and utilization process for the production of caramel color by the common method. The invention uses a harmless organic matter containing a large amount of aldehyde groups and/or hydroxyl groups, and the harmless organic matter is absorbed by condensation reaction with organic matters such as furfural and the like under the acidic and high-temperature conditions of aqueous solution, so that polymer precipitation is not generated; the volatile small amount of organic acid is absorbed by sodium carbonate. The whole absorbed solution can be used as a raw material in the production process of caramel color by an ammonium sulfite method, so that clean absorption and utilization of tail gas generated by caramel color by a common method are realized, and the influence on the atmospheric environment is avoided.
The technical scheme adopted by the invention is as follows:
the tail gas absorbing process for caramel color production with common method adopts Roots pump and two absorption tanks, the tail gas pipe of the reaction kettle is connected with the gas inlet pipe of the first absorption tank A through the Roots pump, the gas outlet pipe of the first absorption tank A is connected with the gas inlet pipe of the second absorption tank B, and the gas inlet pipes of the two absorption tanks are immersed into the solution of the absorption tanks, comprising the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 20-50% accounting for 1/8-1/3 of the volume in a first absorption tank A;
(2) When the caramelization reaction temperature of the common method reaches 130 ℃, tail gas (the tail gas contains volatile organic compounds and steam) in the reaction kettle is pumped into a first absorption tank A by a Roots pump, so that the tail gas and the added organic substances E are subjected to condensation reaction and absorbed, and the absorbed solution is clear and free of precipitation;
(3) A small amount of organic acid escaping from the first absorption tank A is introduced into the second absorption tank B along with steam, and the second absorption tank B is filled with 1/6-1/3 of soda solution with the mass concentration of 5-10% accounting for volume, so that the acid gas is completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B.
In the step (1), the organic matter E is organic matter xylose and/or arabinose containing aldehyde groups and/or hydroxyl groups;
in the step (2), when the pH value of the absorption liquid is 2.5, stopping absorption, and re-exchanging the absorption organic matter E aqueous solution;
in the step (3), when the pH value of the absorption liquid is 6.5, the soda solution is replaced again.
The organic matter E and the absorption reactant in the first absorption tank A and the sodium carbonate and the absorption reactant in the second absorption tank B can be used as raw materials for caramel color production by an ammonium sulfite method to be added into the production reaction process for recycling.
The beneficial effects of the invention are as follows: under the conditions of acidity and high temperature of aqueous solution, harmless organic matters E containing a large amount of aldehyde groups and/or hydroxyl groups are subjected to aldol condensation reaction (the aldehyde groups of the organic matters E and the aldol groups are combined into a dimer) with organic matters such as furfural volatilized by caramelization reaction during high-glucose heating, boiling and dehydration, and meanwhile, the aldehyde groups of the aldol are combined with the hydroxyl groups of the added organic matters to generate hemiacetal and acetal, so that the nasal choking volatile matters are reacted and absorbed with the added organic matters E at high temperature and then remain in the solution, and the absorption liquid of the first absorption tank A is clear and free from precipitation; the very small amount of organic acid volatilized again is absorbed by sodium carbonate. The harmless organic matter E and the whole absorbed solution can be used as raw materials in the reaction production process of caramel color by an ammonium sulfite method, so that the tail gas absorption and utilization of caramel color production by a common method are realized, and the atmospheric environment is not influenced.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in fig. 1, example 1: the invention relates to a tail gas absorption process for caramel color production by a common method, which adopts a stainless steel Roots pump and two absorption tanks, wherein a tail gas pipe of a reaction kettle is connected with an air inlet pipe of a first absorption tank A by the Roots pump, an air outlet pipe of the first absorption tank A is connected with an air inlet pipe of a second absorption tank B, and the air inlet pipes of the two absorption tanks are immersed into a solution of the absorption tanks, and the tail gas absorption process comprises the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 20% accounting for 1/8 of the volume in a first absorption tank A; the organic matter E is arabinose;
(2) When the caramelization reaction temperature of the common method reaches 130 ℃, tail gas in the reaction kettle is pumped into the first absorption tank A by a Roots pump, the tail gas contains volatile organic matters and steam, so that the tail gas and the added organic matters E are subjected to condensation reaction and absorbed, and the absorbed solution is clear and free of precipitation; stopping absorbing when the pH value of the absorption liquid is 2.5, and re-exchanging the absorption organic matter E aqueous solution;
(3) A small amount of organic acid escaping from the first absorption tank a is introduced into the second absorption tank B along with steam, and 1/6 of the volume of the sodium carbonate solution with the mass concentration of 10% is filled in the second absorption tank B, so that the acid gas is completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B. When the pH value of the absorption liquid is 6.5, the soda solution is replaced again.
The observation shows that the absorption liquid in the first absorption tank A is clear and has no sediment, and can be used as the raw material for caramel color production by the ammonium sulfite method to be added into the production reaction process to be recycled.
Example 2: the invention relates to a tail gas absorption process for caramel color production by a common method, which adopts a stainless steel Roots pump and two absorption tanks, wherein a tail gas pipe of a reaction kettle is connected with an air inlet pipe of a first absorption tank A by the Roots pump, an air outlet pipe of the first absorption tank A is connected with an air inlet pipe of a second absorption tank B, and the air inlet pipes of the two absorption tanks are immersed into a solution of the absorption tanks, and the tail gas absorption process comprises the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 30% accounting for 1/3 of the volume in a first absorption tank A; the organic matter E is xylose;
(2) When the caramelization reaction temperature of the common method reaches 130 ℃, tail gas in the reaction kettle is pumped into the first absorption tank A by a Roots pump, the tail gas contains volatile organic matters and steam, so that the tail gas and the added organic matters E are subjected to condensation reaction and absorbed, and the absorbed solution is clear and free of precipitation; stopping absorbing when the pH value of the absorption liquid is 2.5, and re-exchanging the absorption organic matter E aqueous solution;
(3) A small amount of organic acid escaping from the first absorption tank a is introduced into the second absorption tank B along with steam, and the second absorption tank B is filled with 1/3 of the sodium carbonate solution with the mass concentration of 5% by volume, so that the acid gas is completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B. When the pH value of the absorption liquid is 6.5, the soda solution is replaced again.
The observation shows that the absorption liquid in the first absorption tank A is clear and has no sediment, and can be used as the raw material for caramel color production by the ammonium sulfite method to be added into the production reaction process to be recycled.
Example 3: the invention relates to a tail gas absorption process for caramel color production by a common method, which adopts a stainless steel Roots pump and two absorption tanks, wherein a tail gas pipe of a reaction kettle is connected with an air inlet pipe of a first absorption tank A by the Roots pump, an air outlet pipe of the first absorption tank A is connected with an air inlet pipe of a second absorption tank B, and the air inlet pipes of the two absorption tanks are immersed into a solution of the absorption tanks, and the tail gas absorption process comprises the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 40% accounting for 1/4 of the volume in a first absorption tank A; the organic matter E is xylose and arabinose, wherein the xylose and the arabinose are mixed according to the proportion of 1:1;
(2) When the caramelization reaction temperature of the common method reaches 130 ℃, tail gas in the reaction kettle is pumped into the first absorption tank A by a Roots pump, the tail gas contains volatile organic matters and steam, so that the tail gas and the added organic matters E are subjected to condensation reaction and absorbed, and the absorbed solution is clear and free of precipitation; stopping absorbing when the pH value of the absorption liquid is 2.5, and re-exchanging the absorption organic matter E aqueous solution;
(3) A small amount of organic acid escaping from the first absorption tank a is introduced into the second absorption tank B along with steam, and 1/4 of the volume of the sodium carbonate solution with the mass concentration of 6% is filled in the second absorption tank B, so that the acid gas is completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B. When the pH value of the absorption liquid is 6.5, the soda solution is replaced again.
The observation shows that the absorption liquid in the first absorption tank A is clear and has no sediment, and can be used as the raw material for caramel color production by the ammonium sulfite method to be added into the production reaction process to be recycled.
Example 4: the invention relates to a tail gas absorption process for caramel color production by a common method, which adopts a stainless steel Roots pump and two absorption tanks, wherein a tail gas pipe of a reaction kettle is connected with an air inlet pipe of a first absorption tank A by the Roots pump, an air outlet pipe of the first absorption tank A is connected with an air inlet pipe of a second absorption tank B, and the two absorption tank air inlet pipes are immersed in a solution of the absorption tank, and the tail gas absorption process comprises the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 50% accounting for 1/5 of the volume in a first absorption tank A; the organic matter E is xylose and arabinose, wherein the xylose and the arabinose are mixed according to the proportion of 2:1;
(2) When the caramelization reaction temperature of the common method reaches 130 ℃, tail gas in the reaction kettle is pumped into the first absorption tank A by a Roots pump, the tail gas contains volatile organic matters and steam, so that the tail gas and the added organic matters E are subjected to condensation reaction and absorbed, and the absorbed solution is clear and free of precipitation; stopping absorbing when the pH value of the absorption liquid is 2.5, and re-exchanging the absorption organic matter E aqueous solution;
(3) A small amount of organic acid escaping from the first absorption tank a is introduced into the second absorption tank B along with steam, and 1/5 of the volume of the 8% sodium carbonate solution is filled in the second absorption tank B, so that the acid gas is completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B. When the pH value of the absorption liquid is 6.5, the soda solution is replaced again.
The observation shows that the absorption liquid in the first absorption tank A is clear and has no sediment, and can be used as the raw material for caramel color production by the ammonium sulfite method to be added into the production reaction process to be recycled.
Claims (3)
1. The tail gas absorbing process for caramel color production with common method adopts Roots pump and two absorption tanks, the tail gas pipe of the reaction kettle is connected with the gas inlet pipe of the first absorption tank A through the Roots pump, the gas outlet pipe of the first absorption tank A is connected with the gas inlet pipe of the second absorption tank B, and the gas inlet pipes of the two absorption tanks are immersed into the solution of the absorption tanks, comprising the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 20-50% accounting for 1/8-1/3 of the volume in a first absorption tank A; the organic matter E is xylose and/or arabinose;
(2) When the caramelization reaction temperature of the common method reaches 130 ℃, tail gas in the reaction kettle is pumped into a first absorption tank A by a Roots pump, so that the tail gas and the added organic matter E are subjected to condensation reaction and absorbed;
(3) A small amount of organic acid escaping from the first absorption tank A is introduced into the second absorption tank B along with steam, and the second absorption tank B is filled with 1/6-1/3 of soda solution with the mass concentration of 5-10% accounting for volume, so that the acid gas is completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B.
2. The tail gas absorption process for ordinary caramel color production as claimed in claim 1, wherein the tail gas absorption process is characterized in that: in the step (2), when the pH value of the absorption liquid is 2.5, stopping absorption, and changing the absorption organic matter E solution again.
3. The tail gas absorption process for ordinary caramel color production as claimed in claim 1, wherein the tail gas absorption process is characterized in that: in the step (3), when the pH value of the absorption liquid is 6.5, the soda solution is replaced again.
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