WO2022080905A1 - 젖산 기화 방법, 젖산 기화 장치, 및 아크릴산 제조 방법 - Google Patents
젖산 기화 방법, 젖산 기화 장치, 및 아크릴산 제조 방법 Download PDFInfo
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- WO2022080905A1 WO2022080905A1 PCT/KR2021/014268 KR2021014268W WO2022080905A1 WO 2022080905 A1 WO2022080905 A1 WO 2022080905A1 KR 2021014268 W KR2021014268 W KR 2021014268W WO 2022080905 A1 WO2022080905 A1 WO 2022080905A1
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- lactic acid
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- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 title claims abstract description 748
- 239000004310 lactic acid Substances 0.000 title claims abstract description 372
- 235000014655 lactic acid Nutrition 0.000 title claims abstract description 372
- 230000008016 vaporization Effects 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 61
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 title claims description 32
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 title claims description 32
- 238000009834 vaporization Methods 0.000 claims description 108
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 102
- 239000007864 aqueous solution Substances 0.000 claims description 79
- 238000005507 spraying Methods 0.000 claims description 68
- 238000006243 chemical reaction Methods 0.000 claims description 52
- 239000000243 solution Substances 0.000 claims description 48
- 239000007921 spray Substances 0.000 claims description 35
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000012071 phase Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 14
- 238000002309 gasification Methods 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 claims description 9
- 238000003306 harvesting Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 238000007781 pre-processing Methods 0.000 claims description 5
- 239000006200 vaporizer Substances 0.000 claims 9
- 239000007789 gas Substances 0.000 claims 3
- 239000007792 gaseous phase Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 description 16
- 238000006297 dehydration reaction Methods 0.000 description 13
- JVTAAEKCZFNVCJ-UHFFFAOYSA-M Lactate Chemical compound CC(O)C([O-])=O JVTAAEKCZFNVCJ-UHFFFAOYSA-M 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 9
- 238000012546 transfer Methods 0.000 description 9
- OZZQHCBFUVFZGT-UHFFFAOYSA-N 2-(2-hydroxypropanoyloxy)propanoic acid Chemical compound CC(O)C(=O)OC(C)C(O)=O OZZQHCBFUVFZGT-UHFFFAOYSA-N 0.000 description 8
- 239000000539 dimer Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
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- 238000004128 high performance liquid chromatography Methods 0.000 description 4
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- GUBGYTABKSRVRQ-XLOQQCSPSA-N Alpha-Lactose Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@H](O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-XLOQQCSPSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 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 1
- GUBGYTABKSRVRQ-QKKXKWKRSA-N Lactose Natural products OC[C@H]1O[C@@H](O[C@H]2[C@H](O)[C@@H](O)C(O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@H]1O GUBGYTABKSRVRQ-QKKXKWKRSA-N 0.000 description 1
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- 240000008042 Zea mays Species 0.000 description 1
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- 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 1
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- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
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- 229920002223 polystyrene Polymers 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/347—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/1606—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
- B05B7/1613—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
- B05B7/26—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device
- B05B7/262—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device a liquid and a gas being brought together before entering the discharge device
- B05B7/267—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device a liquid and a gas being brought together before entering the discharge device the liquid and the gas being both under pressure
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/347—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups
- C07C51/377—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups
Definitions
- the present specification relates to a method for vaporizing lactic acid, an apparatus for vaporizing lactic acid, and a method for producing acrylic acid from lactic acid.
- Lactic acid also called lactic acid or lactic acid, is an organic acid with a relatively simple structure that contains both a hydroxy group and a carboxyl group in a molecule.
- Lactic acid is traditionally mainly produced naturally during the fermentation process of lactose or glucose, and has played a role in improving the flavor of fermented foods. It has been used variously in the cosmetic field, such as a skin whitening agent, or in the medical field, such as an intravenous solution, a dialysis solution, and a calcium agent.
- lactic acid polymer and polylactide are biodegradable, so interest is increasing as an eco-friendly alternative polymer that can replace plastics that are not naturally decomposed, such as polyolefin, polystyrene, and polyester manufactured from petroleum. It is also receiving high attention as a precursor of acrylic acid, which is considered to be very important.
- Lactic acid can be mainly produced by microbial fermentation or chemical synthesis. Recently, starch-based biomass such as corn, sugar-based biomass such as sugar cane, or cellulose-based biomass obtained from woody or herbaceous plants, etc., Methods for producing lactic acid using biomass resources as raw materials are being studied.
- Lactic acid obtained in this way is usually stored at a high concentration during storage or distribution after production, but a dimer structure is formed due to the unique structural characteristics of the lactic acid molecule including both hydroxy groups and carboxyl groups in the molecule.
- water molecules are removed to form an oligomer in the form of dehydration condensation.
- An object of the present specification is to provide a method for vaporizing lactic acid, and an apparatus for vaporizing lactic acid, which can reduce the content of lactic acid oligomers within a short time and obtain a single vaporized lactic acid molecule.
- the present specification is to provide a method for producing acrylic acid from the vaporized lactic acid.
- the step of heating and pressurizing the lactic acid aqueous solution of the 1-1 concentration spraying a liquid phase 1-1 stream containing the heated and pressurized lactic acid aqueous solution of 1-1 concentration into a vaporization reactor; vaporizing the lactic acid contained in the 1-1 stream through spraying; and obtaining a first 1-3 stream of a gas phase comprising lactic acid molecules.
- the lactic acid aqueous solution of the 1-1 concentration is heated at a temperature of about 150°C to about 250°C, preferably at least about 150°C, or at least about 160°C, about a temperature of 250 °C or less, or about 200 °C or less; and about 1 bar to about 40 bar, preferably more than about 1 bar, or about 5 bar or more, about 40 bar or less, or about 30 bar or less, or about 15 bar or less.
- the concentration of 1-1 is about 20 to about 99 wt%, about 20 wt% or more, or about 30 wt% or more, or about 40 wt% or more, or about 50 wt% or more, or about 60 wt% or more, or about 70 wt% or more, or about 75 wt% or more, and about 99 wt% or less, about 95 wt% or less, or about 90 wt% or less, or about 85 wt% or less . That is, the lactic acid aqueous solution may be concentrated to a high concentration.
- the temperature of the 1-1 stream is about 10 to about 300 °C, preferably about 10 °C or more, or about 50 °C or more , or about 150 °C or higher, about 300 °C or lower, or about 250 °C or lower, or about 200 °C or lower.
- the 1-1 stream has a flow rate of about 0.1 g/min to 1.0 g/min, preferably about 0.1 g/min or more, or about 0.15 g/min or more, about 1.0 It may be preferable to spray at a flow rate of g/min or less, or about 0.5 g/min or less, or about 0.3 g/min or less, and in this case, the temperature inside the reactor may be about 300 to about 400 °C.
- the 1-1 stream is heated and pressurized at a temperature of 150° C. to 250° C. and a pressure of 1 to 40, and transported, and then aerosol into the reactor at atmospheric pressure at a temperature of about 10° C. to about 300° C. It can be sprayed in the form of
- the 1-2 stream of a gas phase containing water vapor may be mixed and sprayed.
- the temperature of the first-2 stream may be about 200 to about 600 °C, preferably about 250 °C or more, or about 300 °C or more, or about 350 °C or more, or about 400 °C or more, and about 600 °C or less , or about 550 °C or less, or about 530 °C or less.
- the temperature difference between the first-2 stream and the first 1-1 stream is about 200 °C or more, or about 250 °C or more, and about 500 °C or less, or about 450 °C or less.
- the first-2 stream has a flow rate of 0.1 g/min to 3.0 g/min, preferably about 0.1 g/min or more, or about 0.2 g/min or more, or about 0.3 g/min or more, about 3.0 It may be desirable to spray at a flow rate of g/min or less, or about 2.0 g/min or less, or about 1.0 g/min or less.
- the flow rate of the 1-1 stream: the flow rate of the 1-2 stream may be preferably about 1: 1.5 to about 1: 5.
- the present specification provides a method comprising: vaporizing lactic acid according to any one of the methods described above to obtain lactic acid molecules; producing acrylic acid by dehydrating the lactic acid molecules; And it provides a method for producing acrylic acid, comprising the step of obtaining the acrylic acid.
- the pretreatment unit for heating and pressurizing the lactic acid aqueous solution of the 1-1 concentration; a feed supply unit receiving the lactic acid aqueous solution from the pre-treatment unit and supplying a 1-1 stream containing the lactic acid aqueous solution; a spraying unit for spraying the 1-1 stream transferred from the feed supply unit into the gasification reactor; a vaporization reactor in which the atomized aqueous lactic acid solution is vaporized; And it provides a lactic acid vaporizing device, comprising a harvesting unit, for obtaining a first 1-3 stream comprising vaporized lactic acid molecules.
- the pretreatment unit the first 1-1 concentration of the aqueous lactic acid solution at a temperature of about 150 °C to about 250 °C, preferably about 150 °C or more, or about 160 °C or more, about 250 °C or less, or a temperature of about 200° C. or less; and a temperature control unit and pressure for heating and pressurizing to a pressure condition of from about 1 bar to about 40 bar, preferably greater than about 1 bar, or greater than or equal to about 5 bar, less than or equal to about 40 bar, or less than or equal to about 30 bar, or less than or equal to about 15 bar. It may further include a control unit.
- the concentration of 1-1 is about 20 to about 99 wt%, about 20 wt% or more, or about 30 wt% or more, or about 40 wt% or more, or about 50 wt% or more, or about 60 wt% or more, or about 70 wt% or more, or about 75 wt% or more, and about 99 wt% or less, about 95 wt% or less, or about 90 wt% or less, or about 85 wt% or less . That is, the lactic acid aqueous solution may be concentrated to a high concentration.
- the temperature of the first 1-1 stream in the feed supply unit may be about 150 to about 300 ° C, preferably about 150 ° C or more, or about 160 ° C or more, and about 300 ° C or less, Or it may be about 250 ° C. or less, or about 200 ° C. or less, and the feed supply unit may further include a feed temperature control unit for controlling the temperature of the 1-1 stream.
- the spray unit, the first 1-1 stream has a flow rate of about 0.1 g/min to 1.0 g/min, preferably about 0.1 g/min or more, or about 0.15 g/min or more , about 1.0 g/min or less, or about 0.5 g/min or less, or about 0.3 g/min or less, and a 1-1 stream nozzle adjusted to spray at a flow rate of less than or equal to about 0.3 g/min.
- the lactic acid vaporization device further includes a steam supply unit for supplying steam, and the spray unit receives steam from the steam generator and receives steam from the steam generating device to receive steam from the first 1- of the gas phase containing steam
- a second stream nozzle for spraying the second stream into the gasification reactor may be further included.
- the temperature of the first-2 stream may be about 200 to about 600 °C, preferably about 250 °C or more, or about 300 °C or more, or about 350 °C or more, or about 400 °C or more, and about 600 °C or less , or about 550 °C or less, or about 530 °C or less.
- the water vapor supply unit may further include a water vapor temperature control unit for controlling the temperature of the first and second streams.
- the temperature difference between the first-2 stream and the first 1-1 stream is about 200 °C or more, or about 250 °C or more, and about 500 °C or less, or about 450 °C or less.
- the second stream in the spraying unit the flow rate of 0.1 g / min to 3.0 g / min, preferably about 0.1 g / min or more, or about 0.2 g / min or more, or about 0.3 g / min It may be desirable to control the spraying at a flow rate of about 3.0 g/min or less, or about 2.0 g/min or less, or about 1.0 g/min or less.
- liquid phase Liquid phase
- gas phase gas phase 3-2 stream containing water vapor mixed spraying; vaporizing the aqueous lactic acid solution through heat exchange between the 3-1 stream and the 3-2 stream; and obtaining a gas phase 3-3 stream comprising single molecules of lactic acid.
- the lactic acid aqueous solution included in the 3-1 stream has a lactic acid concentration of about 40 to about 99 wt%, about 45 wt% or more, or about 50 wt% or more, or about 60 wt% or more, or about 70 wt% or more, or about 75 wt% or more, and is concentrated to a high concentration, about 99 wt% or less, about 95 wt% or less, or about 90 wt% or less, or about 85 wt% or less can
- the concentration of the multimer in the aqueous lactic acid solution included in the 3-1 stream is about 2 to about 55 wt%, or about 2 wt% or more, or It may be about 5% or more, or about 7 wt% or more, or about 8 wt% or more, and is about 55 wt% or less, or about 40 wt% or less, or about 20 wt% or less, wherein the content of the multimer is relatively high.
- the temperature of the third stream may be about 10 to about 300 °C, preferably about 10 °C or more, or about 15 °C or more, or about 50 °C or more, and about 300 °C or less, or about 250° C. or less, or about 200° C. or less.
- the temperature of the third stream may be about 200 to about 600 °C, preferably about 250 °C or more, or about 300 °C or more, or about 350 °C or more, or about 400 °C or more, and about 600 °C or less , or about 550 °C or less, or about 530 °C or less.
- the temperature difference between the 3-2 stream and the 3-1 stream may be about 200 °C or more, or about 250 °C or more, and it may be preferably about 500 °C or less, or about 450 °C or less.
- the third stream may be sprayed at a flow rate of 0.05 g/min to 1.5 g/min, and the lower limit thereof is about 0.05 g/min or more, or about 0.1 g/min. min, or about 0.15 g/min or more, or about 0.18 g/min or more, with an upper limit of about 1.5 g/min or less, or about 1.0 g/min or less, or about 0.8 g/min or less. may be desirable.
- the 3-2 stream may be sprayed at a flow rate of 0.1 g/min to 4.0 g/min, and the lower limit value is about 0.1 g/min or more, or about 0.2 g/min or more, or about 0.3 g /min or more, and the upper limit thereof may preferably be about 4.0 g/min or less, or about 3.0 g/min or less, or about 2.0 g/min or less.
- the flow rate of the 3-1 stream: the flow rate of the 3-2 stream may be about 1: 1.5 to about 1: 5.
- the present specification vaporizing lactic acid according to any one of the methods above to obtain a lactic acid molecule; producing acrylic acid by dehydrating the lactic acid molecules; And it provides a method for producing acrylic acid, comprising the step of obtaining the acrylic acid.
- a feed supply unit 100 for supplying a 3-1 stream (1) containing an aqueous lactic acid solution
- a water vapor supply unit 200 for supplying a 3-2 stream containing water vapor (2)
- a vaporization reaction unit 300 receiving a 3-1 stream from the feed supply unit and receiving a 3-2 stream supplied from the water vapor supply unit to perform a vaporization reaction of an aqueous lactic acid solution
- an obtaining unit (400) for obtaining a 3-3 stream (3) comprising vaporized lactic acid molecules.
- the vaporization reaction unit 300, the spray unit 310, which sprays the 3-1 stream supplied from the feed supply unit and the 3-2 stream supplied from the water vapor supply unit to the inside of the vaporization reaction unit at the bottom thereof may include
- the feed supply unit the lactic acid aqueous solution feed 110 for supplying the lactic acid aqueous solution; and a feed pre-processing unit 120 for controlling the temperature and pressure of the 3-1 stream.
- the feed pre-processing unit 120, the 3-1 stream may be discharged by adjusting the temperature of about 10 to about 300 °C.
- the water vapor supply unit for supplying water
- a water pretreatment unit 220 for controlling the temperature and pressure of the 3-2 stream.
- the water pretreatment unit 220 may control the 3-2 stream to a temperature of about 200 to about 600° C. and discharge it.
- the spray unit may include a mixing spray nozzle for mixing and spraying the 3-1 stream and the 2 streams.
- the spraying unit may include a 3-1 nozzle for spraying the 3-1 stream and a 3-2 nozzle for spraying the 2 stream.
- the ratio of the 3-1 stream spray flow rate to the 3-2 stream spray flow rate may be adjusted to be about 1: 1.5 to about 1: 5.
- the obtaining unit may be located above the vaporization reaction unit.
- the obtaining unit may include a gas-liquid separator 410 for separating and discharging vaporized lactic acid molecules and liquefied aqueous solution components.
- the aqueous solution component discharged from the gas-liquid separator may be recovered as the lactic acid aqueous solution feed 110 and reused.
- each layer or element is formed “on” or “over” each layer or element, it means that each layer or element is formed directly on each layer or element, or other It means that a layer or element may additionally be formed between each layer, on the object, on the substrate.
- lactic acid is a compound represented by the following formula, and unless otherwise specified in the present specification, is used as a concept encompassing all of lactic acid isomers, naturally occurring lactic acid dimers, and lactic acid oligomers.
- heating and pressurizing an aqueous lactic acid solution having a concentration of 1-1 spraying a 1-1 stream of a liquid phase comprising the heated and pressurized aqueous lactic acid solution of 1-1 concentration; vaporizing the lactic acid contained in the 1-1 stream through spraying; and obtaining a gaseous first 1-3 stream comprising lactic acid molecules.
- lactic acid vaporization method may be implemented by the following apparatus.
- the pre-treatment unit for heating and pressurizing the lactic acid aqueous solution of the 1-1 concentration; a feed supply unit receiving the lactic acid aqueous solution from the pretreatment unit and supplying a 1-1 stream containing the lactic acid aqueous solution; A spraying unit for spraying the 1-1 stream transferred from the feed supply unit into the gasification reactor; a vaporization reactor in which the atomized aqueous lactic acid solution is vaporized; and an harvesting unit for obtaining a first 1-3 stream comprising vaporized lactic acid molecules.
- the inventors of the present invention when heating and pressurizing a highly concentrated aqueous lactic acid solution to a high-temperature and high-pressure state, and spraying it to a vaporization reactor under atmospheric conditions, and instantaneously vaporizing it, the oligomer concentration of lactic acid can be efficiently reduced in a very short time. It was found that it can be lowered to , and the present invention was completed.
- Lactic acid is widely used in the production of acrylic acid.
- acrylic acid is produced by dehydrating lactic acid, since it proceeds by a gas phase reaction, it is necessary to vaporize lactic acid into lactic acid molecules.
- lactic acid is usually stored at a high concentration during storage or distribution after production. dimer) structure, or water molecules are removed to form an oligomer in the form of dehydration condensation.
- Such lactic acid oligomer molecules may be carbonized in the vaporization step or reaction step to form coking, thereby reducing the active area of the reaction catalyst, and may be included as a by-product in the final product. Since the content of lactic acid in the form of single molecules that can participate is greatly reduced, it is necessary to convert the lactic acid oligomer into a single molecule in the concentrated lactic acid aqueous solution to lower the content of the oligomer and increase the content of the single molecule lactate.
- the concentration is diluted by simply adding water to the concentrated aqueous solution of lactic acid containing a high content of lactic acid oligomers, the equilibrium movement speed is very slow, so it takes a very long time to lower the content of the lactic acid oligomers.
- a high concentration of lactic acid aqueous solution is heated and vaporized. Since the vaporization efficiency of lactic acid is lower than that of water, water is vaporized first, and the proportion of vaporized lactic acid is less than about 20 wt% will do In this case, as the water is vaporized first, the concentration of the remaining aqueous lactic acid solution is further increased. Accordingly, there is a problem in that the concentration of the oligomer in the remaining aqueous lactic acid solution is also increased.
- the lactic acid aqueous solution having a concentration of 1-1 is first heated and pressurized to make a high-temperature and high-pressure state, and it is sprayed into the vaporization reactor, through which the first-
- the lactic acid contained in the first stream may be instantaneously vaporized, and vapor phase 1-3 streams containing vaporized lactic acid molecules may be obtained.
- the lactic acid vaporization method as described above may be implemented by a device to be described later.
- the pre-processing unit for heating and pressurizing the aqueous lactic acid solution of the 1-1 concentration; a feed supply unit receiving the lactic acid aqueous solution from the pretreatment unit and supplying a 1-1 stream containing the lactic acid aqueous solution; A spraying unit for spraying the 1-1 stream transferred from the feed supply unit into the gasification reactor; a vaporization reactor in which the atomized aqueous lactic acid solution is vaporized; and an yielding portion for obtaining a first 1-3 stream comprising vaporized lactic acid molecules.
- the concentration of lactic acid in the 1-3 stream may be about 30 wt% or less, or about 25 wt% or less, or about 20 wt% or less, and the lower limit thereof may not have much meaning depending on process conditions, but about 0.1 It may be greater than or equal to about 5 wt%, or greater than or equal to about 5 wt%.
- first 1-3 streams comprising single molecules of lactic acid include, for example, less than about 1 wt% of the lactic acid oligomer described above, preferably less than about 0.5 wt%, or less than about 0.1 wt% and, more preferably, substantially free of lactic acid oligomers.
- Substantially free of lactic acid oligomer means that the content of lactic acid oligomer is 0 wt% within a detectable limit in the process.
- the concentration of 1-1 is about 20 to about 99 wt%, about 20 wt% or more, or about 30 wt% or more, or about 40 wt% or more, or about 50 wt% or more, or about 60 wt% or more, or about 70 wt% or more, or about 75 wt% or more, and about 99 wt% or less, about 95 wt% or less, or about 90 wt% or less, or about 85 wt% or less . That is, the lactic acid aqueous solution may be concentrated to a high concentration.
- the lactic acid aqueous solution included in the 1-1 stream is in a state in which lactic acid is dissolved in water, and, as described above, naturally, depending on the temperature and concentration conditions, a lactic acid single molecule, a lactic acid dimer, and It means a state including all lactic acid oligomers.
- lactic acid concentration described herein also refers to the concentration of a lactic acid-based compound including not only a single lactate molecule, but also a single lactate molecule, a lactic acid dimer, and a lactic acid oligomer.
- the oligomer content for each concentration of the total lactic acid-based compound is shown in Table 1 below.
- calculation errors may appear depending on the actual calculation model, and the actual measured values may also have some measurement errors depending on the measurement conditions or measurement method (titration method or HPLC).
- the lactic acid aqueous solution of the 1-1 concentration is heated at a temperature of about 150°C to about 250°C, preferably at least about 150°C, or at least about 160°C, about a temperature of 250 °C or less, or about 200 °C or less; and about 1 bar to about 40 bar, preferably more than about 1 bar, or about 5 bar or more, about 40 bar or less, or about 30 bar or less, or about 15 bar or less.
- the pre-treatment unit may further include a temperature control unit and a pressure control unit for heating and pressurizing the lactic acid aqueous solution having a concentration of 1-1 at a temperature of 150° C. to 250° C. and a pressure of 1 bar to 40 bar.
- the temperature of the 1-1 stream is about 10 to about 300 °C, preferably about 10 °C or more, or about 50 °C or more , or about 150 °C or higher, about 300 °C or lower, or about 250 °C or lower, or about 200 °C or lower.
- the feed supply unit may further include a feed temperature control unit for controlling the temperature of the 1-1 stream.
- the lactic acid aqueous solution supplied from the feed is heated, it is sprayed in the form of droplets into the vaporization reactor through a transfer line and a nozzle.
- the atomizing unit may include a 1-1 stream nozzle for spraying the 1-1 stream into the vaporization reactor.
- the 1-1 stream has a flow rate of about 0.1 g/min to 1.0 g/min, preferably about 0.1 g/min or more, or about 0.15 g/min or more, about 1.0 It may be desirable to spray at a flow rate of g/min or less, or about 0.5 g/min or less, or about 0.3 g/min or less.
- the flow rate of the supplied lactic acid is too low, and there may be a problem that an overreaction proceeds in the dehydration reaction proceeding to the next step, and if it is too high, A problem of incomplete vaporization may occur because the heat required for vaporization increases.
- the 1-2 stream including high-temperature water vapor may be sprayed into the vaporization reactor through a transfer line and nozzle separate from the 1-1 stream. That is, it may be preferable that the 1-1 stream and the 1-2 stream are mixed and sprayed together into a gasification reactor.
- the lactic acid vaporization device further includes a water vapor supply unit for supplying water vapor, and the spray unit receives water vapor from the water vapor generator and receives water vapor from the vapor generating device and contains water vapor (gas phase) ) may further include a 1-2 stream nozzle for spraying the 1-2 stream of.
- the hot water vapor supplied to the second stream is mixed with the lactic acid supplied to the first stream 1-1 to instantly dilute the lactic acid to a lower concentration, and in addition, heat energy is transferred to the lactic acid molecules
- the hot water vapor supplied to the second stream is mixed with the lactic acid supplied to the first stream 1-1 to instantly dilute the lactic acid to a lower concentration, and in addition, heat energy is transferred to the lactic acid molecules
- the transfer lines of the 1-1 stream and the 1-2 stream are first combined before spraying, and then mixed spraying may be performed through the same nozzle, but rather than the first 1-1 stream and the 1-2 More preferably, the streams are mixed and sprayed into the gasification reactor through separate nozzles, respectively.
- the temperature of the first-2 stream may be from about 200 to about 600 °C, preferably from about 250 °C or higher, or about 300 °C or higher, or about 350 °C or higher, or about 400 °C or higher, and about 600 °C or higher. or less, or about 550 °C or less, or about 530 °C or less.
- the temperature difference between the first-2 stream and the first 1-1 stream is about 200 °C or more, or about 250 °C or more, and about 500 °C or less, or about 450 °C or less.
- the temperature of the first-2 stream is too low outside the above range, the temperature of the mixture is too low to cause a problem that lactic acid is not sufficiently vaporized, and when the temperature of the first-2 stream is too high outside the above range, There may be a problem in that the pressure is excessively increased to maintain the temperature.
- the water vapor supply unit may further include a water vapor temperature control unit for controlling the temperature of the first-second stream.
- the first-2 stream has a flow rate of 0.1 g/min to 3.0 g/min, preferably about 0.1 g/min or more, or about 0.2 g/min or more, or about 0.3 g/min or more, about 3.0 It may be desirable to spray at a flow rate of g/min or less, or about 2.0 g/min or less, or about 1.0 g/min or less.
- the flow rate of the 1-1 stream: the flow rate of the 1-2 stream may be preferably about 1: 1.5 to about 1: 5.
- the interior of the vaporization reactor is, in advance, steam It may be desirable to saturate it with
- the present specification provides a step of vaporizing lactic acid according to the above-described method to obtain a lactic acid molecule; producing acrylic acid by dehydrating the lactic acid molecules; And it provides a method for producing acrylic acid, comprising the step of obtaining the acrylic acid.
- the reaction to produce acrylic acid by intramolecular dehydration of lactic acid can be represented by the following chemical formula, and is known to proceed in one step in the presence of a catalyst.
- the catalyst used for the lactic acid dehydration reaction is CaSO 4 / Na 2 SO 4 ; Na 4 P 2 O 7 /CaSO 4 ; Na 4 P 2 O 7 /Ca 3 (PO 4 ) 2 ; NaH 2 PO 4 -NaHCO 3 /SiO 2 ; AlPO 4 -NH 3 ; Ca 3 (PO 4 ) 2 /CaSO 4 and the like.
- the dehydration reaction using a solid catalyst may proceed as a continuous reaction using a fixed reactor, a batch reaction, or the like.
- a product can be continuously produced by charging a solid catalyst in the reactor and continuously supplying reactants to the reactor to react.
- the temperature of the dehydration reaction may be from about 300 to about 500 °C, or from about 350 to about 450 °C.
- the reaction pressure may be from about 1 atmosphere to about 5 atmospheres, or from about 1 atmosphere to about 2 atmospheres.
- the feed rate of the reactant may vary depending on the type or type of the reactor, other reaction conditions, etc., but specifically, for example, the lactic acid feed rate in the gas phase (Weight Hourly Space Velocity, WHSV) is about 0.05 to about 1.0/hr, or about 0.10 to about 0.50/hr.
- WHSV Weight Hourly Space Velocity
- a feed supply unit 100 for supplying a 3-1 stream (1) containing an aqueous lactic acid solution; a water vapor supply unit 200 for supplying a 3-2 stream containing water vapor (2); a vaporization reaction unit 300 receiving a 3-1 stream from the feed supply unit and receiving a 3-2 stream supplied from the water vapor supply unit to perform a vaporization reaction of an aqueous lactic acid solution; and an obtaining unit (400) for obtaining a 3-3 stream (3) comprising vaporized lactic acid molecules.
- the inventors of the present invention have discovered that, when a highly concentrated aqueous lactic acid solution is mixed and sprayed with water vapor and vaporized through direct heat exchange, the oligomer concentration of lactic acid can be effectively lowered in a very short time, and the present invention was completed.
- Lactic acid is widely used in the production of acrylic acid.
- acrylic acid is produced by dehydrating lactic acid, since it proceeds by a gas phase reaction, it is necessary to vaporize lactic acid into lactic acid molecules.
- lactic acid is usually stored at a high concentration during storage or distribution after production. dimer) structure, or water molecules are removed to form an oligomer in the form of dehydration condensation.
- Such lactic acid oligomer molecules may be carbonized in the vaporization step or reaction step to form coking, thereby reducing the active area of the reaction catalyst, and may be included as a by-product in the final product. Since the content of lactic acid in the form of single molecules that can participate is greatly reduced, it is necessary to convert the lactic acid oligomer into a single molecule in the concentrated lactic acid aqueous solution to lower the content of the oligomer and increase the content of the single molecule lactate.
- the concentration is diluted by simply adding water to the concentrated aqueous solution of lactic acid containing a high content of lactic acid oligomers, the equilibrium movement speed is very slow, so it takes a very long time to lower the content of the lactic acid oligomers.
- a high concentration of lactic acid aqueous solution of about 80 wt% or more is heated and vaporized. Since the vaporization efficiency of lactic acid is lower than that of water, water is vaporized first, and the ratio of lactic acid in the gas phase It is less than about 20 wt%. In this case, as the water is vaporized first, the concentration of the remaining aqueous lactic acid solution is further increased. Accordingly, the concentration of the oligomer in the remaining aqueous lactic acid solution is also increased, so there is a problem that an additional treatment process is required for this.
- the method for vaporizing lactic acid mixing and spraying a 3-1 stream of a liquid phase containing an aqueous lactic acid solution and a 3-2 stream of a gas phase containing water vapor step; vaporizing the aqueous lactic acid solution through heat exchange between the 3-1 stream and the 3-2 stream; and obtaining a gaseous third stream comprising short molecules of lactic acid.
- the feed supply unit 100 for supplying the 3-1 stream (1) containing the lactic acid aqueous solution; a water vapor supply unit 200 for supplying a 3-2 stream containing water vapor (2); a vaporization reaction unit 300 receiving a 3-1 stream from the feed supply unit and receiving a 3-2 stream supplied from the water vapor supply unit to perform a vaporization reaction of an aqueous lactic acid solution; and an obtaining unit (400) for obtaining a 3-3 stream (3) comprising vaporized lactic acid molecules.
- FIG. 1 is a schematic diagram showing a lactic acid vaporization device according to an embodiment of the present invention.
- a feed supply unit 100 for supplying a 3-1 stream (1) containing an aqueous lactic acid solution
- a water vapor supply unit 200 for supplying a 3-2 stream containing water vapor (2)
- a vaporization reaction unit 300 receiving a 3-1 stream from the feed supply unit and receiving a 3-2 stream supplied from the water vapor supply unit to perform a vaporization reaction of an aqueous lactic acid solution
- the lactic acid vaporization device comprising a obtaining unit 400, which obtains the 3-3 stream (3) containing the vaporized lactic acid molecules.
- a high-concentration aqueous lactic acid solution is sprayed in the form of an aerosol, but mixed and sprayed with high-temperature water vapor here, the concentration of lactic acid
- concentration of lactic acid in the 3-3 stream may be about 30 wt% or less, or about 25 wt% or less, or about 20 wt% or less, and the lower limit may not have much meaning depending on the process conditions, but about 0.1 wt% or more, or about 5 wt% or more.
- the third stream comprising single molecules of lactic acid more specifically, comprises, for example, less than about 1 wt% of the aforementioned lactic acid oligomer, preferably less than about 0.5 wt%, or less than about 0.1 wt% and, more preferably, substantially free of lactic acid oligomers.
- Substantially free of lactic acid oligomer means that the content of lactic acid oligomer is 0 wt% within a detectable limit in the process.
- the lactic acid aqueous solution included in the third stream 3-1 has a lactic acid concentration of about 40 to about 99 wt%, about 45 wt% or more, or about 50 wt% or more, or about 60 wt% or more, or about 70 wt% or more, or about 75 wt% or more, and is concentrated to a high concentration, about 99 wt% or less, about 95 wt% or less, or about 90 wt% or less, or about 85 wt% or less can
- the concentration of the multimer in the aqueous lactic acid solution included in the 3-1 stream is about 2 to about 55 wt%, or about 2 wt% or more, or It may be about 5% or more, or about 7 wt% or more, or about 8 wt% or more, and about 55 wt% or less, or about 40 wt% or less, or about 20 wt% or less, wherein the content of the multimer is relatively high.
- the 3-1 stream that is, the aqueous lactic acid solution included in the lactic acid feed in the process, is in a state in which lactic acid is dissolved in water, and, as described above, naturally, depending on the temperature and concentration conditions, a lactic acid single molecule, a lactic acid dimer, and It refers to a state including all lactic acid oligomers, and the lactic acid concentration described herein also refers to the concentration of lactic acid-based compounds including not only a single lactate molecule, but also a single lactate molecule, a lactic acid dimer, and a lactic acid oligomer.
- the oligomer content for each concentration of the total lactic acid-based compound is shown in Table 2 below.
- calculation errors may appear depending on the actual calculation model, and the actual measured values may also have some measurement errors depending on the measurement conditions or measurement method (titration method or HPLC).
- the lactic acid aqueous solution (3-1 stream) supplied from the feed may be subjected to a heating process.
- the feed supply unit the lactic acid aqueous solution feed 110 for supplying the lactic acid aqueous solution; and a feed pre-processing unit 120 for controlling the temperature and pressure of the 3-1 stream.
- the feed preprocessor 120 may be discharged by adjusting the 3-1 stream to a temperature of about 10 to about 300 °C and a pressure range of 1 to 50 atmospheres.
- the temperature of the 3-1 stream discharged from the feed pretreatment unit may be about 10 to about 300 °C, preferably about 10 °C or more, or about 15 °C or more, or about 50 °C or more, 300 °C or less, or about 250 °C or less, or about 200 °C or less.
- the lactic acid aqueous solution supplied from the feed is heated, it is sprayed in the form of droplets into the vaporization reactor through a transfer line and a nozzle.
- the temperature of the lactic acid aqueous solution is maintained high, so that the higher the pressure, the more advantageous it is to obtain small-sized droplets.
- the 3-2 stream including water vapor is also mixed and sprayed with the 3-1 stream in the form of droplets in the vaporization reactor through a transfer line and a nozzle.
- the transfer lines of the 3-1 stream and the 3-2 stream are first combined before spraying, and then mixed spraying may be performed through the same nozzle, but rather the 3-1 stream and the 3-2 stream More preferably, the streams are mixed and sprayed into the gasification reactor through separate nozzles, respectively.
- the vaporization reaction unit 310 is a spray unit ( 310) may be included.
- the 3-1 stream and the 3-2 stream are i) combined in the step before spraying, mixed and sprayed into the vaporization reaction part, or ii) combined into a single nozzle in the spraying step, inside the vaporization reaction part , or iii) may be mixed and sprayed into the vaporization reaction unit through a separate nozzle.
- the spray unit may include a mixing spray nozzle for mixing and spraying the 3-1 stream and the 2 streams.
- the spraying unit may include a 3-1 nozzle for spraying the 3-1 stream and a 3-2 nozzle for spraying the 2 stream.
- the 3-1 stream and the 3-2 stream are mixed and sprayed into the gasification reactor through separate nozzles, respectively.
- the 3-2 stream temporarily lowers the concentration of lactic acid in the 3-1 stream including the highly concentrated lactic acid while simultaneously transferring thermal energy to the 3-1 stream to promote vaporization of lactic acid molecules. , it is possible to lower the proportion of oligomers.
- the temperature of the third stream may be from about 200 to about 600 °C, preferably from about 250 °C or higher, or about 300 °C or higher, or about 350 °C or higher, or about 400 °C or higher, and about 600 °C. or less, or about 550° C. or less, or about 530° C. or less.
- the water vapor supply unit includes: a water supply unit 210 for supplying water; and a water pretreatment unit 220 for controlling the temperature and pressure of the 3-2 stream.
- the water pretreatment unit 220 may control the 3-2 stream to the above-mentioned temperature and a pressure range of about 1 to 10 atmospheres to discharge it.
- the temperature difference between the 3-2 stream and the 3-1 stream may be about 200 °C or higher, or about 250 °C or higher, and preferably about 500 °C or lower, or about 450 °C or lower.
- the temperature of the 3-2 stream is too low outside the above range, the temperature of the mixture is low and the lactic acid is not sufficiently vaporized, and if the temperature of the 3-2 stream is too high outside the above range, the temperature There may be a problem in that the pressure becomes excessively high for maintenance.
- the third stream may be sprayed at a flow rate of 0.05 g/min to 1.5 g/min, and the lower limit thereof is about 0.05 g/min or more, or about 0.1 g/min. min, or about 0.15 g/min or more, or about 0.18 g/min or more, with an upper limit of about 1.5 g/min or less, or about 1.0 g/min or less, or about 0.8 g/min or less. it may be desirable
- the flow rate of the supplied lactic acid is too low to cause a problem that an overreaction proceeds in the dehydration reaction proceeding to the next step, and if it is too high, Incomplete vaporization may occur due to the increased heat required for vaporization.
- the 3-2 stream may be sprayed at a flow rate of 0.1 g/min to 4.0 g/min, and the lower limit value is about 0.1 g/min or more, or about 0.2 g/min or more, or about 0.3 g /min or more, and the upper limit thereof may preferably be about 4.0 g/min or less, or about 3.0 g/min or less, or about 2.0 g/min or less.
- the flow rate of the 3-1 stream: the flow rate of the 3-2 stream may be about 1: 1.5 to about 1: 5.
- the efficiency may be lowered due to the low flow rate of the supplied lactic acid, and a problem may occur that the load increases in the product separation process, and the flow rate ratio of the 3-2 stream If this is too small, less heat is supplied to the vaporization and incomplete vaporization may occur.
- the inside of the vaporization reactor is, in advance, water vapor It may be desirable to saturate it with
- the obtaining unit may be located above the vaporization reaction unit.
- the lactic acid aqueous solution contained in the 3-1 stream is instantaneously vaporized and the lactic acid single molecules generated are transferred to the upper part of the vaporization reaction part. will be moved to the receiving section of
- the obtaining unit may include a gas-liquid separator 410 for separating and discharging vaporized lactic acid molecules and liquefied aqueous solution components.
- the aqueous solution component discharged from the gas-liquid separator may be recovered as the lactic acid aqueous solution feed 110 and reused.
- the present specification vaporizing lactic acid according to any one of the above methods to obtain a lactic acid molecule; producing acrylic acid by dehydrating the lactic acid molecules; And it provides a method for producing acrylic acid, comprising the step of obtaining the acrylic acid.
- the reaction to produce acrylic acid by intramolecular dehydration of lactic acid can be represented by the following chemical formula, and is known to proceed in one step in the presence of a catalyst.
- the catalyst used for the lactic acid dehydration reaction is CaSO 4 / Na 2 SO 4 ; Na 4 P 2 O 7 /CaSO 4 ; Na 4 P 2 O 7 /Ca 3 (PO 4 ) 2 ; NaH 2 PO 4 -NaHCO 3 /SiO 2 ; AlPO 4 -NH 3 ; Ca 3 (PO 4 ) 2 /CaSO 4 and the like.
- the dehydration reaction using a solid catalyst may proceed as a continuous reaction using a fixed reactor, a batch reaction, or the like.
- a product can be continuously produced by charging a solid catalyst in the reactor and continuously supplying reactants to the reactor to react.
- the temperature of the dehydration reaction may be from about 300 to about 500 °C, or from about 300 to about 400 °C.
- the reaction pressure may be from about 1 atmosphere to about 5 atmospheres, or from about 1 atmosphere to about 2 atmospheres.
- the feed rate of the reactant may vary depending on the type or type of the reactor, other reaction conditions, etc., but specifically, for example, the lactic acid feed rate in the gas phase (Weight Hourly Space Velocity, WHSV) is about 0.05 to about 1.0/hr, or about 0.10 to about 0.50/hr may proceed.
- WHSV Weight Hourly Space Velocity
- lactic acid vaporization method and apparatus it is possible to reduce the content of lactic acid oligomers and increase the content of single lactic acid molecules in a short time in a high concentration of lactic acid aqueous solution.
- FIG. 1 is a schematic diagram showing a lactic acid vaporization device according to an embodiment of the present invention.
- An aqueous lactic acid solution having a concentration of about 80 wt% was prepared.
- the lactic acid aqueous solution was heated and pressurized under the conditions of 180° C. and 10 atm, and prepared to be supplied as a feed.
- Lactic acid aqueous solution that is, lactic acid, lactic acid dimer, and lactic acid aqueous solution concentration of the feed containing all of lactic acid oligomer was determined by taking each sample, measuring the carbon content through elemental analysis, and dividing this by the carbon content ratio in lactic acid .
- the ratio of lactic acid oligomers (including dimers) in the aqueous lactic acid solution is determined by taking each sample and analyzing the content of single lactate molecules through HPLC. It was calculated by dividing by the amount of lactic acid-based compound.
- a feed supply unit for supplying the 1-1 stream containing the lactic acid aqueous solution; a water vapor supply unit for supplying a 1-2 stream containing water vapor; A spray unit in which the lactic acid aqueous solution transferred from the feed supply unit and the water vapor transferred from the water vapor supply unit are mixed and sprayed through each nozzle; After the mixed spray, the lactic acid aqueous solution is vaporized, the vaporization reaction unit; And a lactic acid vaporizing device was prepared in the form of a harvesting unit for obtaining a 1-3 stream containing vaporized lactic acid molecules.
- the feed supply unit and the steam supply unit are equipped with a thermometer and a temperature control device, so that the temperature of the feed (first 1-1 stream) and water vapor (1-2 stream) can be adjusted, and the harvesting unit is equipped with a 1-3 stream A thermometer was provided to measure the temperature of
- water vapor was introduced into the vaporization reactor so that the interior of the vaporization reactor was saturated with water vapor.
- the lactic acid aqueous solution according to Examples 1 to 7 is supplied to the 1-1 stream through the feed supply unit, and water vapor is supplied through the water vapor supply unit, so that it is continuously mixed and sprayed into the vaporization reaction unit through each nozzle. While doing so, a 1-3 stream containing vaporized lactic acid molecules was obtained through the harvesting section.
- Example 1 180 10 0.2 450 0.60
- Example 2 180 10 0.2 500 0.35
- Streams 1-3 obtained were analyzed to measure and calculate the concentration of total lactic acid-based compounds and the ratio of oligomers in streams 1-3, and are summarized in Table 5 below.
- Example 1 Stream 1-3 temperature (°C) lactic acid concentration (wt%) oligomer ratio
- Example 2 180 9 0.03
- the content of lactic acid oligomer can be reduced in a very short time by continuously vaporizing lactic acid.
- Example 1 Concentration of lactic acid aqueous solution (wt%) Initial oligomer ratio temperature (°C) enter (ATM) Example 1 80 0.24 25 One Example 2 80 0.23 80 One Example 3 80 0.24 80 One Example 4 70 0.15 80 One Example 5 60 0.1 80 One Example 6 80 0.23 180 10 Example 7 80 0.24 180 10
- the lactic acid aqueous solution that is, lactic acid, lactic acid dimer, and the lactic acid aqueous solution concentration of the feed containing all of lactic acid oligomer was determined by taking each sample, measuring the carbon content through elemental analysis, and dividing this by the carbon content ratio in lactic acid .
- the ratio of lactic acid oligomers (including dimers) in the aqueous lactic acid solution is determined by taking each sample and analyzing the content of single lactate molecules through HPLC. It was calculated by dividing by the amount of lactic acid-based compound.
- a feed supply unit for supplying a 3-1 stream containing the lactic acid aqueous solution; a water vapor supply unit for supplying a 3-2 stream containing water vapor;
- a spray unit in which the lactic acid aqueous solution transferred from the feed supply unit and the water vapor transferred from the water vapor supply unit are mixed and sprayed through each nozzle; After the mixed spray, the lactic acid aqueous solution is vaporized, the vaporization reaction unit;
- a lactic acid vaporizing apparatus of the type illustrated in FIG. 1 was prepared, including a harvesting part, for obtaining a 3-3 stream containing vaporized lactic acid molecules.
- the feed supply unit and the steam supply unit are equipped with a thermometer and a temperature control device, so that the temperature of the feed (3-1 stream) and water vapor (3-2 stream) can be controlled, and the 3-3 stream is provided in the obtaining unit.
- a thermometer was provided to measure the temperature of
- water vapor was introduced into the vaporization reactor so that the interior of the vaporization reactor was saturated with water vapor.
- the lactic acid aqueous solution according to Examples 1 to 7 is supplied to the 3-1 stream through the feed supply unit, and water vapor is supplied through the water vapor supply unit, so that it is continuously mixed and sprayed into the vaporization reaction unit through each nozzle. While doing so, a 3-3 stream containing vaporized lactic acid molecules was obtained through the harvesting section.
- Example 1 25 One 0.6 450 1.8
- Example 2 80 One 0.6 450 1.8
- Example 3 80 One 0.4 500 1.2
- Example 4 80 One 0.4 500 1.0
- Example 5 80 One 0.2 500 0.40
- Example 6 180 10 0.2 450 0.60
- Example 7 180 10 0.2 500 0.35
- Example 1 3-3 Stream temperature (°C) lactic acid concentration (wt%) oligomer ratio
- Example 1 25 14 0.08
- Example 2 80 16 0.10
- Example 3 80 17 0.12
- Example 4 80 15 0.06
- Example 5 80 ⁇ 1 0
- Example 6 180 19 0.04
- Example 7 180 9 0.03
- the content of lactic acid oligomer can be reduced in a very short time by continuously vaporizing lactic acid.
- 100 feed supply; 110: lactic acid aqueous solution feed; 120: feed preprocessor;
- 200 water vapor supply unit; 210: water supply; 220: water pretreatment unit;
- 300 vaporization reaction unit; 310: spray unit;
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Abstract
Description
전체 젖산계 화합물의 농도 (wt%) |
단 분자 농도 (wt%) |
2량체 농도 (wt%) |
3량체 이상 농도 (wt%) |
5 | 5.0 | 0.019 | 0.001 |
10 | 9.9 | 0.079 | 0.011 |
15 | 14.8 | 0.187 | 0.013 |
20 | 19.6 | 0.35 | 0.05 |
25 | 24.3 | 0.575 | 0.125 |
30 | 29.0 | 0.874 | 0.126 |
35 | 33.6 | 1.26 | 0.14 |
40 | 38.0 | 1.75 | 0.25 |
45 | 42.3 | 2.35 | 0.35 |
50 | 46.3 | 3.11 | 0.59 |
55 | 50.2 | 4.03 | 0.77 |
60 | 53.8 | 5.18 | 1.02 |
65 | 56.9 | 6.58 | 1.52 |
70 | 59.6 | 8.31 | 2.09 |
75 | 61.5 | 10.4 | 3.1 |
80 | 62.5 | 13.0 | 4.5 |
85 | 62.2 | 16.2 | 6.6 |
90 | 60.1 | 19.8 | 10.1 |
95 | 55.4 | 23.6 | 16 |
100 | 47.6 | 26.6 | 25.8 |
전체 젖산계 화합물의 농도 (wt%) |
단 분자 농도 (wt%) |
2량체 농도 (wt%) |
3량체 이상 농도 (wt%) |
5 | 5.0 | 0.019 | 0.001 |
10 | 9.9 | 0.079 | 0.011 |
15 | 14.8 | 0.187 | 0.013 |
20 | 19.6 | 0.35 | 0.05 |
25 | 24.3 | 0.575 | 0.125 |
30 | 29.0 | 0.874 | 0.126 |
35 | 33.6 | 1.26 | 0.14 |
40 | 38.0 | 1.75 | 0.25 |
45 | 42.3 | 2.35 | 0.35 |
50 | 46.3 | 3.11 | 0.59 |
55 | 50.2 | 4.03 | 0.77 |
60 | 53.8 | 5.18 | 1.02 |
65 | 56.9 | 6.58 | 1.52 |
70 | 59.6 | 8.31 | 2.09 |
75 | 61.5 | 10.4 | 3.1 |
80 | 62.5 | 13.0 | 4.5 |
85 | 62.2 | 16.2 | 6.6 |
90 | 60.1 | 19.8 | 10.1 |
95 | 55.4 | 23.6 | 16 |
100 | 47.6 | 26.6 | 25.8 |
젖산 수용액 농도 (wt%) |
올리고머 비율 | 온도 (℃) |
압력 (atm) |
|
실시예 1 | 80 | 0.23 | 180 | 10 |
실시예 2 | 80 | 0.24 | 180 | 10 |
젖산 수용액 온도 (℃) |
젖산 수용액 압력 (atm) |
젖산 수용액 분무량 ( g/min) |
수증기 온도 (℃) |
수증기 분무량 | |
실시예 1 | 180 | 10 | 0.2 | 450 | 0.60 |
실시예 2 | 180 | 10 | 0.2 | 500 | 0.35 |
제1-3 스트림 온도 (℃) |
젖산 농도 (wt%) |
올리고머 비율 | |
실시예 1 | 180 | 19 | 0.04 |
실시예 2 | 180 | 9 | 0.03 |
젖산 수용액 농도 (wt%) |
초기 올리고머 비율 | 온도 (℃) |
압력 (atm) |
|
실시예 1 | 80 | 0.24 | 25 | 1 |
실시예 2 | 80 | 0.23 | 80 | 1 |
실시예 3 | 80 | 0.24 | 80 | 1 |
실시예 4 | 70 | 0.15 | 80 | 1 |
실시예 5 | 60 | 0.1 | 80 | 1 |
실시예 6 | 80 | 0.23 | 180 | 10 |
실시예 7 | 80 | 0.24 | 180 | 10 |
젖산 수용액 온도 (℃) |
젖산 수용액 압력 (atm) |
젖산 수용액 분무량 (g/min) |
수증기 온도 (℃) |
수증기 분무량 (g/min) |
|
실시예 1 | 25 | 1 | 0.6 | 450 | 1.8 |
실시예 2 | 80 | 1 | 0.6 | 450 | 1.8 |
실시예 3 | 80 | 1 | 0.4 | 500 | 1.2 |
실시예 4 | 80 | 1 | 0.4 | 500 | 1.0 |
실시예 5 | 80 | 1 | 0.2 | 500 | 0.40 |
실시예 6 | 180 | 10 | 0.2 | 450 | 0.60 |
실시예 7 | 180 | 10 | 0.2 | 500 | 0.35 |
제3-3 스트림 온도 (℃) |
젖산 농도 (wt%) |
올리고머 비율 | |
실시예 1 | 25 | 14 | 0.08 |
실시예 2 | 80 | 16 | 0.10 |
실시예 3 | 80 | 17 | 0.12 |
실시예 4 | 80 | 15 | 0.06 |
실시예 5 | 80 | <1 | 0 |
실시예 6 | 180 | 19 | 0.04 |
실시예 7 | 180 | 9 | 0.03 |
Claims (41)
- 제1-1 농도의 젖산 수용액을 가열 및 가압하는 단계;상기 가열 및 가압된 제1-1 농도의 젖산 수용액을 포함하는 액상(Liquid phase)의 제1-1 스트림을 분무하는 단계;분무를 통해 상기 제1-1 스트림에 포함된 젖산을 기화시키는 단계; 및젖산 분자를 포함하는 기상의 제1-3 스트림을 수득하는 단계를 포함하는,젖산의 기화 방법.
- 제1항에 있어서,상기 가열 및 가압하는 단계는, 상기 제1-1 농도의 젖산 수용액을 150℃ 내지 250℃ 의 온도 및 1bar 내지 40bar의 압력 조건으로 가열 및 가압하는, 젖산의 기화 방법.
- 제1항에 있어서,상기 제1-1 농도는 20 내지 99 wt%인, 젖산 기화 방법.
- 제1항에 있어서,상기 제1-1 스트림의 온도는 10 ℃ 내지 300 ℃인, 젖산 기화 방법.
- 제1항에 있어서,상기 제1-1 스트림은, 0.1 g/min 내지 1.0 g/min의 유량으로 분무되는, 젖산 기화 방법.
- 제1항에 있어서,상기 제1-1 스트림 분무 시, 상기 제1-1 스트림 및 수증기를 포함하는 기상(gas phase)의 제1-2 스트림을 혼합 분무하는,젖산 기화 방법.
- 제6항에 있어서,상기 제1-2 스트림의 온도는 200 내지 600 ℃인, 젖산 기화 방법.
- 제6항에 있어서,상기 제1-2 스트림은, 0.1 g/min 내지 3.0 g/min의 유량으로 분무되는, 젖산 기화 방법.
- 제6항에 있어서,상기 혼합 분무 단계에서 제1-1 스트림 유량 : 제1-2 스트림 유량 = 1 : 1.5 내지 1: 5인, 젖산 기화 방법.
- 제1항 내지 제9항 중 어느 한 항의 방법에 따라 젖산을 기화하여 젖산 분자를 수득하는 단계;상기 젖산 분자를 탈수 반응시켜 아크릴산을 제조하는 단계; 및상기 아크릴산을 수득하는 단계를 포함하는,아크릴산 제조 방법.
- 제1-1 농도의 젖산 수용액을 가열 및 가압하는, 전처리 부;상기 전처리 부로부터 젖산 수용액을 공급받아 젖산 수용액을 포함하는 제1-1 스트림을 공급하는 피드 공급부;상기 피드 공급부로부터 이송된 제1-1 스트림을 기화 반응기 내부로 분무하는, 분무부;분무된 젖산 수용액이 기화되는, 기화 반응기; 및 기화된 젖산 분자를 포함하는 제1-3 스트림을 수득하는, 수득부를 포함하는,젖산 기화 장치.
- 제11항에 있어서,상기 전처리 부는, 제1-1 농도의 젖산 수용액을 150℃ 내지 250℃ 의 온도 및 1bar 내지 40bar의 압력 조건으로 가열 및 가압하는 온도 조절부 및 압력 조절부를 더 포함하는, 젖산 기화 장치.
- 제1-2 항에 있어서,상기 제1-1 농도는 20 내지 99 wt%인, 젖산 기화 장치.
- 제11항에 있어서,상기 피드 공급부는 상기 제1-1 스트림의 온도는 150 내지 300 ℃로 조절하는 피드 온도 조절부를 더 포함하는, 젖산 기화 장치.
- 제11항에 있어서,상기 분무부는, 상기 제1-1 스트림이 0.1 g/min 내지 1.0 g/min의 유량으로 분무되도록 조절하는 제1-1 스트림 노즐을 포함하는, 젖산 기화 장치.
- 제11항에 있어서,상기 젖산 기화 장치는 수증기를 공급하는 수증기 공급부를 더 포함하고,상기 분무부는 및 상기 수증기 발생 장치로부터 수증기를 공급받아 수증기를 포함하는 기상(gas phase)의 제1-2 스트림을 기화 반응기 내부로 분무하는 제1-2 스트림 노즐을 더 포함하는,젖산 기화 장치.
- 제16항에 있어서,상기 수증기 공급부는 상기 제1-2 스트림의 온도를 200 내지 600 ℃로 조절하는 수증기 온도 조절부를 더 포함하는, 젖산 기화 장치.
- 제16항에 있어서,상기 분무부에서 상기 제1-2 스트림은, 0.1 g/min 내지 3.0 g/min의 유량으로 분무되도록 조절되는, 젖산 기화 장치.
- 제16항에 있어서,상기 분무부에서 상기 제1-1 스트림 유량 : 상기 제1-2 스트림 유량 = 1 : 1.5 내지 1: 5가 되도록 조절되는, 젖산 기화 장치.
- 젖산 수용액을 포함하는 액상(Liquid phase)의 제3-1 스트림 및 수증기를 포함하는 기상(gas phase)의 제3-2 스트림을 혼합 분무하는 단계;상기 제3-1 스트림 및 제3-2 스트림 사이의 열 교환을 통해 젖산 수용액을 기화하는 단계; 및젖산 단 분자를 포함하는 기상의 제3-3 스트림을 수득하는 단계를 포함하는,젖산 기화 방법.
- 제20항에 있어서,상기 제3-1 스트림에 포함된 상기 젖산 수용액은 젖산 농도가 40 내지 99 wt%인, 젖산 기화 방법.
- 제20항에 있어서,상기 제3-1 스트림에 포함된 상기 젖산 수용액 중 다량체의 농도가 2 내지 55 wt%인, 젖산 기화 방법.
- 제20항에 있어서,상기 제3-1 스트림의 온도는 10 내지 300 ℃인, 젖산 기화 방법.
- 제20항에 있어서,상기 제3-2 스트림의 온도는 200 내지 600 ℃인, 젖산 기화 방법.
- 제20항에 있어서,상기 제3-2 스트림과 상기 제3-1 스트림의 온도 차는 200 ℃ 내지 500 ℃ 인, 젖산 기화 방법.
- 제20항에 있어서,상기 제3-1 스트림은, 0.05 g/min 내지 1.5 g/min 의 유량으로 분무되는, 젖산 기화 방법.
- 제20항에 있어서,상기 제3-2 스트림은, 0.1 g/min 내지 4.0 g/min의 유량으로 분무되는, 젖산 기화 방법.
- 제20항에 있어서,상기 혼합 분무 단계에서 제3-1 스트림 유량 : 제3-2 스트림 유량 = 1 : 1.5 내지 1: 5인, 젖산 기화 방법.
- 제20항 내지 제28항 중 어느 한 항의 방법에 따라 젖산을 기화하여 젖산 분자를 수득하는 단계;상기 젖산 분자를 탈수 반응시켜 아크릴산을 제조하는 단계; 및상기 아크릴산을 수득하는 단계를 포함하는,아크릴산 제조 방법.
- 젖산 수용액을 포함하는 제3-1 스트림을 공급하는 피드 공급부;수증기를 포함하는 제3-2 스트림을 공급하는 수증기 공급부;상기 피드 공급부로부터 제3-1 스트림을 공급받고, 상기 수증기 공급부로부터 제3-2 스트림을 공급받아 젖산 수용액의 기화 반응을 진행하는 기화 반응부; 및기화된 젖산 분자를 포함하는 제3-3 스트림을 수득하는, 수득부를 포함하는,젖산 기화 장치.
- 제30항에 있어서,상기 기화 반응부는, 그 하단에 상기 피드 공급부로부터 공급받은 제3-1 스트림 및 상기 수증기 공급부로부터 공급받은 제3-2 스트림을 기화 반응부 내부로 분무하는, 분무부를 포함하는,젖산 기화 장치.
- 제30항에 있어서,상기 피드 공급부는, 젖산 수용액을 공급하는 젖산 수용액 피드; 및상기 제3-1 스트림의 온도 및 압력을 조절하기 위한 피드 전처리부를 포함하는, 젖산 기화 장치.
- 제32항에 있어서,상기 피드 전처리부는, 상기 제3-1 스트림을 10 내지 300 ℃의 온도로 배출하는, 젖산 기화 장치.
- 제30항에 있어서,상기 수증기 공급부는, 물을 공급하는 물 공급부; 및상기 제3-2 스트림의 온도 및 압력을 조절하기 위한 물 전처리부를 포함하는, 젖산 기화 장치.
- 제34항에 있어서,상기 물 전처리부는, 상기 제3-2 스트림을 200 내지 600 ℃의 온도로 배출하는, 젖산 기화 장치.
- 제31항에 있어서,상기 분무부는, 상기 제3-1 스트림 및 상기 2 스트림을 혼합하여 분무하는 혼합 분무 노즐을 포함하는,젖산 기화 장치.
- 제31항에 있어서,상기 분무부는, 상기 제3-1 스트림을 분무하는 제3-1 노즐 및 상기 2 스트림을 분무하는 제3-2 노즐을 포함하는,젖산 기화 장치.
- 제31항에 있어서,상기 분무부에서는 상기 제3-2 스트림 분무 유량에 대한 상기 제3-1 스트림 분무 유량의 비가 1 : 1.5 내지 1: 5가 되도록 조절되는,젖산 기화 장치.
- 제30항에 있어서,상기 수득부는 상기 기화 반응부의 상부에 위치하는,젖산 기화 장치.
- 제30항에 있어서,상기 수득부는, 기화된 젖산 분자와 액화된 수용액 성분을 분리 배출하는 기-액 분리기를 포함하는,젖산 기화 장치.
- 제40항에 있어서,상기 기-액 분리기로부터 배출된 수용액 성분은, 젖산 수용액 피드로 회수되어 재사용되는, 젖산 기화 장치.
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Cited By (2)
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EP4385973A1 (en) * | 2022-12-15 | 2024-06-19 | Sulzer Management AG | A method and a plant for purifying lactic acid |
WO2024125878A1 (en) * | 2022-12-15 | 2024-06-20 | Sulzer Management Ag | A method and a plant for purifying lactic acid |
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EP4206177A1 (en) | 2023-07-05 |
JP2023546421A (ja) | 2023-11-02 |
US20230382842A1 (en) | 2023-11-30 |
EP4206177A4 (en) | 2024-03-27 |
CN116323540A (zh) | 2023-06-23 |
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