CN115487667A - Tail gas absorption process for caramel color production by using common method - Google Patents
Tail gas absorption process for caramel color production by using common method Download PDFInfo
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- CN115487667A CN115487667A CN202211122632.6A CN202211122632A CN115487667A CN 115487667 A CN115487667 A CN 115487667A CN 202211122632 A CN202211122632 A CN 202211122632A CN 115487667 A CN115487667 A CN 115487667A
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- caramel color
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 239000000940 FEMA 2235 Substances 0.000 title claims abstract description 28
- 239000000243 solution Substances 0.000 claims abstract description 32
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 239000007864 aqueous solution Substances 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 14
- 235000017550 sodium carbonate Nutrition 0.000 claims abstract description 12
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 12
- 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
- 125000003172 aldehyde group Chemical group 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 5
- 239000005416 organic matter Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 16
- 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
- 238000005516 engineering process Methods 0.000 claims description 3
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 abstract description 8
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 8
- 230000002378 acidificating effect Effects 0.000 abstract description 3
- 238000000710 polymer precipitation Methods 0.000 abstract description 2
- 150000002894 organic compounds Chemical class 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 239000012855 volatile organic compound Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- NOEGNKMFWQHSLB-UHFFFAOYSA-N 5-hydroxymethylfurfural Chemical compound OCC1=CC=C(C=O)O1 NOEGNKMFWQHSLB-UHFFFAOYSA-N 0.000 description 2
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 2
- 229930091371 Fructose Natural products 0.000 description 2
- 239000005715 Fructose Substances 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-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
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000008103 glucose Substances 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
- 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
- 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
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 150000002373 hemiacetals Chemical class 0.000 description 1
- 235000019534 high fructose corn syrup Nutrition 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
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Classifications
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- 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: pumping the tail gas in the reaction kettle into a first absorption tank A containing an aqueous solution of an organic substance E through a Roots pump, so that the tail gas and the added organic substance E are subjected to condensation reaction and absorbed; the small amount of organic acid escaping from the first absorption tank A is introduced into the second absorption tank B filled with the soda ash solution along with the steam, so that the acid gas is also completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B. The invention utilizes harmless organic matters containing a large amount of aldehyde groups and/or hydroxyl groups to carry out condensation reaction with organic matters such as furfural and the like under the acidic and high-temperature conditions of aqueous solution so as to be absorbed, and polymer precipitation is not generated; the volatile organic acid is absorbed by soda ash. The whole absorbed solution can be used as a raw material to be applied to the reaction production process of ammonium sulfite caramel color, so that the tail gas produced by the common method caramel color can be absorbed and utilized cleanly, and the atmospheric environment is not influenced.
Description
Technical Field
The invention relates to a tail gas absorption process for caramel color production by a common method.
Background
The caramel color is produced by a common method by using high fructose corn syrup to perform caramelization reaction under the catalysis of a trace amount of acidity agent. In the dehydration process of heating and boiling under normal pressure, fructose and glucose are continuously dehydrated, condensed, cracked, oxidized and the like to generate a large amount of complex caramelization reaction of organic acids such as 5-hydroxymethyl furfural (HMF), malonic acid and the like, the substances have strong volatility at a high temperature of 130-200 ℃, mixed tail gas is formed along with dehydrated steam and is discharged out of a reaction kettle, and the substances can be discharged into the atmosphere only after being treated due to strong nose choking smell and acid gas. In general, in production, strong alkaline solution of soda ash or caustic soda liquid with the mass concentration of 10% is added into a tail gas absorption tank to participate in reaction and absorption, but the resultant is easy to generate polymerization reaction under strong alkaline, long-time and high-temperature conditions (the temperature of the absorption liquid of superheated steam is 100-102 ℃) until a large amount of blackish brown resin-shaped water-insoluble substances are generated, so that the post-treatment is difficult, the resin-shaped water-insoluble substances cannot be recycled, and the environmental protection is influenced. In particular, 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 of difficult post-treatment, incapability of recycling and influence on environmental protection are solved.
Disclosure of Invention
The invention aims to solve the defects that a large amount of black brown resin-like water-insoluble substances are generated by polymerization reaction of mixed tail gas generated in the production of caramel color by a common method and a product of a strong alkaline solution, the treatment is difficult, the tail gas cannot be recycled, the environmental protection is influenced and the like in the background technology, and provides a tail gas recycling process for the production of the 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 organic acid is absorbed by soda ash. The whole absorbed solution can be used as a raw material to be applied to the production process of ammonium sulfite caramel color, so that the tail gas generated by the common method caramel color can be absorbed and utilized cleanly, and the influence on the atmospheric environment is avoided.
The technical scheme adopted by the invention is as follows:
the utility model provides a tail gas absorption technology of ordinary method caramel color production, adopts lobe pump and two absorption tanks, and reation kettle's tail gas pipe passes through the lobe pump and links to each other with first absorption tank A's intake pipe, and first absorption tank A's blast pipe links to each other with second absorption tank B's intake pipe, and the intake pipe of two absorption tanks submerges in the solution of absorption tank, includes following step:
(1) Placing an organic substance E aqueous solution with the mass content of 20-50% accounting for 1/8-1/3 of the volume in the first absorption tank A;
(2) When the caramelization reaction temperature reaches 130 ℃ by a common method, 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 compounds 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 a second absorption tank B along with steam, and the second absorption tank B is filled with 1/6-1/3 of soda ash solution with the mass concentration of 5-10 percent, so that acid gas is also completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B.
In the step (1), the organic substance E is an organic substance xylose and/or arabinose containing aldehyde group and/or hydroxyl;
in the step (2), when the pH value of the absorption liquid is 2.5, stopping absorption, and replacing the absorption organic substance E aqueous solution again;
in the step (3), when the pH value of the absorption solution 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 soda ash and the absorption reactant in the second absorption tank B can be used as raw materials for producing caramel color by an ammonium sulfite method and are added into the production reaction process to be recycled.
The invention has the beneficial effects that: under the acidic and high-temperature conditions of the aqueous solution, under the heating, boiling and dehydrating conditions of fructose and glucose, organic matters such as furfural and the like volatilized by caramelization reaction are subjected to aldol condensation reaction (aldehyde groups of the two are combined into a dimer), and meanwhile, aldehyde groups of the furfural are combined with the hydroxyl groups of the added organic matters to generate hemiacetal and acetal, so that volatile matters choking nose react with the added organic matters E under the high-temperature condition and are absorbed and then are left in the solution, and the absorption liquid of the first absorption tank A is clear and has no precipitate; the little organic acid volatilized again is absorbed by the soda ash. The harmless organic matter E and the whole absorbed solution can be used as raw materials to be applied to the reaction production process of ammonium sulfite caramel color, so that tail gas absorption and utilization of common caramel color production are realized, and the method has no influence on the atmospheric environment.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
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 a gas inlet pipe of a first absorption tank A through the Roots pump, a gas outlet pipe of the first absorption tank A is connected with a gas inlet pipe of a second absorption tank B, and the gas inlet pipes of the two absorption tanks are immersed in a solution of the absorption tanks, and comprises the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 20 percent 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 reaches 130 ℃ by a common method, pumping tail gas in the reaction kettle into a first absorption tank A by a Roots pump, wherein the tail gas contains volatile organic compounds and steam, so that the tail gas and the added organic compounds E are subjected to condensation reaction and absorbed, and the absorbed solution is clear and free of precipitation; when the pH value of the absorption liquid is 2.5, stopping absorption, and replacing the absorption organic matter E aqueous solution again;
(3) A small amount of organic acid escaping from the first absorption tank A is introduced into a second absorption tank B along with steam, and the second absorption tank B is filled with 1/6 of soda ash solution with the mass concentration of 10 percent, so that acid gas is also 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.
And observing that the absorption liquid in the first absorption tank A is clear and free of precipitate, and can be used as a raw material for caramel color production by an ammonium sulfite method and 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 a gas inlet pipe of a first absorption tank A through the Roots pump, a gas outlet pipe of the first absorption tank A is connected with a gas inlet pipe of a second absorption tank B, and the gas inlet pipes of the two absorption tanks are immersed in a solution of the absorption tanks, and comprises the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 30 percent 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 reaches 130 ℃ by a common method, pumping tail gas in the reaction kettle into a first absorption tank A by a Roots pump, wherein the tail gas contains volatile organic compounds and steam, so that the tail gas and the added organic compounds E are subjected to condensation reaction and absorbed, and the absorbed solution is clear and free of precipitation; when the pH value of the absorption liquid is 2.5, stopping absorption, and replacing the absorption organic matter E aqueous solution again;
(3) A small amount of organic acid escaping from the first absorption tank A is introduced into a second absorption tank B along with steam, and the second absorption tank B is filled with 1/3 of soda ash solution with the mass concentration of 5 percent, which occupies the volume, so that the acid gas is also 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.
And observing that the absorption liquid in the first absorption tank A is clear and has no precipitate, and can be used as a raw material for caramel color production by an 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 a gas inlet pipe of a first absorption tank A through the Roots pump, a gas outlet pipe of the first absorption tank A is connected with a gas inlet pipe of a second absorption tank B, and the gas inlet pipes of the two absorption tanks are immersed in a solution of the absorption tanks, and comprises the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 40 percent 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 reaches 130 ℃ by a common method, pumping tail gas in the reaction kettle into a first absorption tank A by a Roots pump, wherein the tail gas contains volatile organic compounds and steam, so that the tail gas and the added organic compounds E are subjected to condensation reaction and absorbed, and the absorbed solution is clear and free of precipitation; when the pH value of the absorption liquid is 2.5, stopping absorption, and replacing the absorption organic matter E aqueous solution again;
(3) A small amount of organic acid escaping from the first absorption tank A is introduced into a second absorption tank B along with steam, and the second absorption tank B is filled with 1/4 of soda ash solution with mass concentration of 6 percent accounting for the volume, so that acid gas is also 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.
And observing that the absorption liquid in the first absorption tank A is clear and has no precipitate, and can be used as a raw material for caramel color production by an 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 a gas inlet pipe A of a first absorption tank through the Roots pump, a gas outlet pipe A of the first absorption tank is connected with a gas inlet pipe B of a second absorption tank, and the two gas inlet pipes of the absorption tanks are immersed in a solution of the absorption tanks, and comprises the following steps:
(1) Placing an organic matter E aqueous solution with the mass content of 50 percent 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 reaches 130 ℃ by a common method, pumping tail gas in the reaction kettle into a first absorption tank A by a Roots pump, wherein the tail gas contains volatile organic compounds and steam, so that the tail gas and the added organic compounds E are subjected to condensation reaction and absorbed, and the absorbed solution is clear and free of precipitation; when the pH value of the absorption liquid is 2.5, stopping absorption, and replacing the absorption organic matter E aqueous solution again;
(3) A small amount of organic acid escaping from the first absorption tank A is introduced into a second absorption tank B along with steam, and the second absorption tank B is filled with 8% of soda ash solution with the mass concentration of 1/5 of the volume, so that acid gas is also completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B. When the pH value of the absorption solution is 6.5, the soda solution is replaced.
And observing that the absorption liquid in the first absorption tank A is clear and has no precipitate, and can be used as a raw material for caramel color production by an ammonium sulfite method to be added into the production reaction process to be recycled.
Claims (5)
1. The utility model provides a tail gas absorption technology of ordinary method caramel color production, adopts lobe pump and two absorption tanks, and reation kettle's tail gas pipe passes through the lobe pump and links to each other with first absorption tank A's intake pipe, and first absorption tank A's blast pipe links to each other with second absorption tank B's intake pipe, and the intake pipe of two absorption tanks submerges in the solution of absorption tank, includes following step:
(1) Placing an organic substance E aqueous solution with the mass content of 20-50% accounting for 1/8-1/3 of the volume in the first absorption tank A;
(2) When the caramelization reaction temperature reaches 130 ℃ by a common method, pumping tail gas in the reaction kettle into a first absorption tank A by a Roots pump to ensure 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 a second absorption tank B along with steam, and the second absorption tank B is filled with 1/6-1/3 of soda ash solution with the mass concentration of 5-10 percent, so that acid gas is also completely absorbed, and only the steam is discharged into the atmosphere from the second absorption tank B.
2. The tail gas absorption process for caramel color production by a common method according to claim 1, which is characterized in that: in the step (1), the organic matter E is a harmless organic matter containing aldehyde group and/or hydroxyl group.
3. The tail gas absorption process for caramel color production by a common method according to claim 1 or 2, which is characterized in that: in the step (2), when the pH value of the absorption liquid is 2.5, stopping absorption, and replacing the absorption organic substance E solution.
4. The tail gas absorption process for caramel color production by a common method according to claim 3, which is characterized in that: in the step (1), the organic substance E is xylose and/or arabinose.
5. The tail gas absorption process for caramel color production by a common method according to claim 1, which is characterized in that: in the step (3), when the pH value of the absorption solution is 6.5, the soda solution is replaced again.
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