CN112321411A - Micro-interface preparation system and method for formic acid - Google Patents
Micro-interface preparation system and method for formic acid Download PDFInfo
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- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 title claims abstract description 168
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 235000019253 formic acid Nutrition 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000006243 chemical reaction Methods 0.000 claims abstract description 95
- 239000003054 catalyst Substances 0.000 claims abstract description 57
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 50
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 50
- 239000002904 solvent Substances 0.000 claims abstract description 36
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 34
- 239000001257 hydrogen Substances 0.000 claims abstract description 34
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 18
- 238000000066 reactive distillation Methods 0.000 claims abstract description 14
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 76
- 239000007789 gas Substances 0.000 claims description 37
- 238000000926 separation method Methods 0.000 claims description 37
- 238000002156 mixing Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical group [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 claims description 7
- 238000000746 purification Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- HFDWIMBEIXDNQS-UHFFFAOYSA-L copper;diformate Chemical compound [Cu+2].[O-]C=O.[O-]C=O HFDWIMBEIXDNQS-UHFFFAOYSA-L 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000376 reactant Substances 0.000 claims description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 2
- PFQLIVQUKOIJJD-UHFFFAOYSA-L cobalt(ii) formate Chemical compound [Co+2].[O-]C=O.[O-]C=O PFQLIVQUKOIJJD-UHFFFAOYSA-L 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- PQQAOTNUALRVTE-UHFFFAOYSA-L iron(2+);diformate Chemical compound [Fe+2].[O-]C=O.[O-]C=O PQQAOTNUALRVTE-UHFFFAOYSA-L 0.000 claims description 2
- BHVPEUGTPDJECS-UHFFFAOYSA-L manganese(2+);diformate Chemical compound [Mn+2].[O-]C=O.[O-]C=O BHVPEUGTPDJECS-UHFFFAOYSA-L 0.000 claims description 2
- HZPNKQREYVVATQ-UHFFFAOYSA-L nickel(2+);diformate Chemical compound [Ni+2].[O-]C=O.[O-]C=O HZPNKQREYVVATQ-UHFFFAOYSA-L 0.000 claims description 2
- 238000012546 transfer Methods 0.000 abstract description 6
- 230000005501 phase interface Effects 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 32
- 239000007791 liquid phase Substances 0.000 description 16
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 150000007530 organic bases Chemical class 0.000 description 5
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 4
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 description 4
- 238000001308 synthesis method Methods 0.000 description 4
- -1 inorganic base potassium carbonate Chemical class 0.000 description 3
- 150000007529 inorganic bases Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000012327 Ruthenium complex Substances 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- CJBFZKZYIPBBTO-UHFFFAOYSA-N isotetradecane Natural products CCCCCCCCCCCC(C)C CJBFZKZYIPBBTO-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- HZVOZRGWRWCICA-UHFFFAOYSA-N methanediyl Chemical compound [CH2] HZVOZRGWRWCICA-UHFFFAOYSA-N 0.000 description 2
- 230000005311 nuclear magnetism Effects 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- BGHCVCJVXZWKCC-UHFFFAOYSA-N tetradecane Chemical compound CCCCCCCCCCCCCC BGHCVCJVXZWKCC-UHFFFAOYSA-N 0.000 description 2
- OBAJXDYVZBHCGT-UHFFFAOYSA-N tris(pentafluorophenyl)borane Chemical compound FC1=C(F)C(F)=C(F)C(F)=C1B(C=1C(=C(F)C(F)=C(F)C=1F)F)C1=C(F)C(F)=C(F)C(F)=C1F OBAJXDYVZBHCGT-UHFFFAOYSA-N 0.000 description 2
- GTJOHISYCKPIMT-UHFFFAOYSA-N 2-methylundecane Chemical compound CCCCCCCCCC(C)C GTJOHISYCKPIMT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- SGVYKUFIHHTIFL-UHFFFAOYSA-N Isobutylhexyl Natural products CCCCCCCC(C)C SGVYKUFIHHTIFL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006315 carbonylation Effects 0.000 description 1
- 238000005810 carbonylation reaction Methods 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- YCOZIPAWZNQLMR-UHFFFAOYSA-N heptane - octane Natural products CCCCCCCCCCCCCCC YCOZIPAWZNQLMR-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- VKPSKYDESGTTFR-UHFFFAOYSA-N isododecane Natural products CC(C)(C)CC(C)CC(C)(C)C VKPSKYDESGTTFR-UHFFFAOYSA-N 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229940094933 n-dodecane Drugs 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
- B01J2231/60—Reduction reactions, e.g. hydrogenation
- B01J2231/62—Reductions in general of inorganic substrates, e.g. formal hydrogenation, e.g. of N2
- B01J2231/625—Reductions in general of inorganic substrates, e.g. formal hydrogenation, e.g. of N2 of CO2
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/04—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing carboxylic acids or their salts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a micro-interface preparation system and a method of formic acid, wherein the micro-interface preparation system of the formic acid comprises the following components: the side wall of the reactive distillation tower is sequentially provided with a hydrogen inlet, a carbon dioxide inlet and a mixed inlet of a solvent and a catalyst from top to bottom; the reaction rectifying tower is internally provided with a pneumatic micro-interface generator and a hydraulic micro-interface generator, the pneumatic micro-interface generator is arranged between tower plates in the reaction rectifying tower and communicated with a hydrogen inlet for dispersing and crushing the entering hydrogen, and the hydraulic micro-interface generator is arranged at the bottom close to the reaction rectifying tower and communicated with a carbon dioxide inlet for dispersing and crushing the entering carbon dioxide. The micro-interface preparation system of formic acid solves the problems of low reaction rate and low mass transfer rate between reaction phase interfaces in the prior art, reduces the temperature and pressure of hydrogenation reaction, and improves the reaction efficiency.
Description
Technical Field
The invention relates to the field of formic acid preparation, in particular to a system and a method for preparing a micro interface of formic acid.
Background
Formic acid (CAS number: 64-18-6), also known as formic acid, is carboxylic acid with the least carbon number, has stronger acidity and is an important raw material for modern organic chemical industry. The formic acid synthesis method comprises (1) a methanol carbonylation synthesis method, wherein methanol and carbon monoxide are catalyzed by a catalyst to react to generate methyl formate, and then the methyl formate is hydrolyzed to obtain formic acid and methanol; (2) the formamide method is characterized in that carbon monoxide and amine are catalyzed by a catalyst to generate formamide in a methanol solution, and then the formamide is hydrolyzed under an acidic condition to obtain formic acid; (3) the carbon dioxide method directly prepares the formic acid by catalyzing the hydrogenation of carbon dioxide through a catalyst.
Among the above formic acid synthesis methods, the carbon dioxide hydrogenation for formic acid production which has been emerging for nearly 20 years has the highest theoretical atom economy, and is a very potential formic acid synthesis route. However, because the formation of formic acid by the reaction of carbon dioxide and hydrogen is thermodynamically limited, the existing processes all require the addition of an organic or inorganic base to react with formic acid to form formate in the reaction system to drive the reaction toward the formation of formic acidAnd (4) moving. For example, Nature Catal (2018,1,743-747) reports a method for preparing formic acid by using copper carbene as a catalyst to catalyze the reaction of carbon dioxide and hydrogen, but the reaction needs to add an excessive amount of a strong organic base diazabicyclo to react with the formic acid; angew. chem. int.Ed. (2019,58,722-726) reports a method for preparing formic acid by catalyzing the reaction of carbon dioxide and hydrogen gas by using tris (pentafluorophenyl) boron as a catalyst, but excessive inorganic base potassium carbonate is added for the reaction with the formic acid; in patent CN201810255395.8, a method for preparing formic acid by using ruthenium complex as a catalyst to catalyze carbon dioxide hydrogenation is reported, and excessive KHCO is required for the reaction3To react with formic acid to drive the process; in patent CN105367404B, a method for preparing formic acid by carbon dioxide hydrogenation with a nano-porous palladium catalyst is reported, in which an excessive amount of sodium hydroxide or sodium tert-butoxide is required to react with formic acid to drive the process; patent CN106622224A reports a method for preparing formic acid by hydrogenation of carbon dioxide with a nanogold-based catalyst, and the reaction needs an excessive amount of triethylamine or triethanolamine to react with formic acid to drive the process to proceed. In addition, because formic acid is strong in acidity and can react with a plurality of organic metal compounds, the catalyst reported by the existing method is unstable under the formic acid condition, so that the catalyst is quickly deactivated.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the present invention is to provide a micro-interface preparation system, which, on one hand, promotes smooth progress of the reaction by providing a reaction rectifying tower, thereby avoiding the need of adding organic or inorganic alkali to promote the process of preparing formic acid by the reaction, improving the reaction efficiency and simplifying the reaction operation, and on the other hand, by arranging a micro-interface generator in the reaction rectifying tower to efficiently break the entering gas phase into micron-sized bubbles, and dispersing the micron-sized bubbles into a solvent and a catalyst to form a micro-interface system, so as to improve the gas-liquid phase interface area in the reaction gas-liquid by tens of times, and greatly improve the mass transfer rate from the gas phase to the liquid phase.
The second purpose of the invention is to provide a method for preparing formic acid by adopting the micro-interface preparation system, the preparation method is simple and convenient to operate, the obtained formic acid has high purity and high product quality, and the method is worthy of wide popularization and application.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a micro-interface preparation system, comprising: the side wall of the reactive distillation tower is sequentially provided with a hydrogen inlet, a carbon dioxide inlet and a mixed inlet of a solvent and a catalyst from top to bottom;
the reaction rectifying tower is internally provided with a pneumatic micro-interface generator and a hydraulic micro-interface generator, the pneumatic micro-interface generator is arranged between tower plates in the reaction rectifying tower and communicated with a hydrogen inlet for dispersing and crushing the entering hydrogen, the hydraulic micro-interface generator is arranged at the bottom close to the reaction rectifying tower and communicated with a carbon dioxide inlet for dispersing and crushing the entering carbon dioxide, and the micro-interface generator is arranged in a downcomer inside the reaction rectifying tower;
the mixed inlet of the solvent and the catalyst is arranged at the bottom of the reaction rectifying tower and is used for filling the whole reaction rectifying tower with the entering solvent and catalyst;
the top of the reaction rectifying tower is provided with a formic acid outlet for discharging the product formic acid, and the formic acid discharged from the formic acid outlet is further subjected to reaction and purification.
In the formic acid synthesis method in the prior art, because the formation of formic acid by the reaction of carbon dioxide and hydrogen is thermodynamically limited, organic or inorganic base needs to be added into a reaction system in the prior art to react with formic acid to form formate, so as to push the reaction to move towards the formation of formic acid. For example, Nature Catal (2018,1,743-747) reports a method for preparing formic acid by using copper carbene as a catalyst to catalyze the reaction of carbon dioxide and hydrogen, but the reaction needs to add an excessive amount of a strong organic base diazabicyclo to react with the formic acid; angew. chem. int.Ed. (2019,58,722-726) reports a method for preparing formic acid by catalyzing the reaction of carbon dioxide and hydrogen gas by using tris (pentafluorophenyl) boron as a catalyst, but excessive inorganic base potassium carbonate is added for the reaction with the formic acid; specially for cleaningIn the patent of CN201810255395.8, a method for preparing formic acid by using ruthenium complex as a catalyst to catalyze carbon dioxide hydrogenation is reported, and excessive KHCO is required for the reaction3To react with formic acid to drive the process; in patent CN105367404B, a method for preparing formic acid by carbon dioxide hydrogenation with a nano-porous palladium catalyst is reported, in which an excessive amount of sodium hydroxide or sodium tert-butoxide is required to react with formic acid to drive the process; patent CN106622224A reports a method for preparing formic acid by carbon dioxide hydrogenation with a nanogold-based catalyst, the reaction needs to be carried out by reacting with formic acid with excessive triethylamine or triethanolamine, and the like, and thus it can be seen that in the prior art, a certain amount of organic or inorganic base needs to be added to promote the reaction.
The reaction rectifying tower is internally provided with a plurality of tower plates, a catalyst and a solvent enter from a tower bottom, hydrogen and carbon dioxide enter from the middle section of the reaction rectifying tower, in order to improve the reaction effect, two types of micro-interface generators of the reaction rectifying tower are different, the micro-interface generator positioned at the upper part is a pneumatic micro-interface generator, the micro-interface generator positioned at the lower part is a hydraulic micro-interface generator, the hydraulic micro-interface generator is arranged at the tower bottom of the reaction rectifying tower to be close to a mixed inlet of the solvent and the catalyst, and the hydraulic micro-interface generator is selectively communicated with the carbon dioxide inlet. Since this allows better reaction of the carbon dioxide introduced first with the liquid phase.
During actual hydrogenation operation, firstly introducing carbon dioxide into a reaction rectifying tower for vacuum displacement for 2-3 times, then introducing the carbon dioxide to a certain pressure, introducing the carbon dioxide into a micro-interface generator for dispersion and crushing, subsequently introducing hydrogen to a certain pressure, introducing the hydrogen into the micro-interface generator for dispersion and crushing, performing dispersion and crushing on two gas phases after dispersion and crushing, remarkably improving the reaction effect of the subsequent hydrogenation reaction, heating to the reaction temperature, reacting for 8-10 hours generally, and collecting a formic acid solution product from the top of the tower.
It should be noted that each micro-interface generator set in the micro-interface preparation system of the invention is not only different in its own type, but also different in the type of the gas phase to be introduced, the pneumatic micro-interface generator is communicated with the hydrogen inlet, the hydraulic micro-interface generator is communicated with the carbon dioxide inlet, carbon dioxide is introduced first, and hydrogen is introduced later, so the micro-interface generator set at the bottom is a hydraulic micro-interface generator, which is to approach the liquid phase entering from the bottom, and the entering liquid phase is used as the entrainment power, thereby further improving the entrainment and crushing effect of the gas, so the entering carbon dioxide can be better dispersed and crushed under the condition that the catalyst and the solvent are the medium, the effect of mutual close contact is improved, when the carbon dioxide is sufficiently dispersed and crushed, hydrogen is introduced from the gas phase micro-interface generator at the top of the tower, the hydrogen and the carbon dioxide which enter the reactor can be ensured to react violently, and the reaction effect is improved.
Therefore, the micro-interface preparation system of the invention just needs to adopt the micro-interface generator to disperse and crush the two gas-phase raw materials, so the setting position, the specific type and the sample introduction mode of the micro-interface generator need to be adjusted according to the type of the gas-phase raw materials, thereby achieving the optimal reaction effect.
In a word, the micro-interface generator in the reaction rectifying tower breaks the gas phase into micro-bubbles with micron scale, and releases the micro-bubbles into the reaction rectifying tower, so as to increase the phase boundary mass transfer area between the gas phase and the liquid phase in the hydrogenation reaction, fully contact the two phases, improve the reaction efficiency, shorten the reaction time and fully reduce the reaction pressure and temperature.
It will be appreciated by those skilled in the art that the micro-interface generator used in the present invention is described in the prior patents of the present inventor, such as the patents of application numbers CN201610641119.6, CN201610641251.7, CN201710766435.0, CN106187660, CN105903425A, CN109437390A, CN205833127U and CN 207581700U. The detailed structure and operation principle of the micro bubble generator (i.e. micro interface generator) is described in detail in the prior patent CN201610641119.6, which describes that "the micro bubble generator comprises a body and a secondary crushing member, wherein the body is provided with a cavity, the body is provided with an inlet communicated with the cavity, the opposite first end and second end of the cavity are both open, and the cross-sectional area of the cavity decreases from the middle of the cavity to the first end and second end of the cavity; the secondary crushing member is disposed at least one of the first end and the second end of the cavity, a portion of the secondary crushing member is disposed within the cavity, and an annular passage is formed between the secondary crushing member and the through holes open at both ends of the cavity. The micron bubble generator also comprises an air inlet pipe and a liquid inlet pipe. "the specific working principle of the structure disclosed in the application document is as follows: liquid enters the micro-bubble generator tangentially through the liquid inlet pipe, and gas is rotated at a super high speed and cut to break gas bubbles into micro-bubbles at a micron level, so that the mass transfer area between a liquid phase and a gas phase is increased, and the micro-bubble generator in the patent belongs to a pneumatic micro-interface generator.
In addition, the first patent 201610641251.7 describes that the primary bubble breaker has a circulation liquid inlet, a circulation gas inlet and a gas-liquid mixture outlet, and the secondary bubble breaker communicates the feed inlet with the gas-liquid mixture outlet, which indicates that the bubble breakers all need to be mixed with gas and liquid, and in addition, as can be seen from the following drawings, the primary bubble breaker mainly uses the circulation liquid as power, so that the primary bubble breaker belongs to a hydraulic micro-interface generator, and the secondary bubble breaker simultaneously introduces the gas-liquid mixture into an elliptical rotating ball for rotation, thereby realizing bubble breaking in the rotating process, so that the secondary bubble breaker actually belongs to a gas-liquid linkage micro-interface generator. In fact, the micro-interface generator is a specific form of the micro-interface generator, whether it is a hydraulic micro-interface generator or a gas-liquid linkage micro-interface generator, however, the micro-interface generator adopted in the present invention is not limited to the above forms, and the specific structure of the bubble breaker described in the prior patent is only one of the forms that the micro-interface generator of the present invention can adopt.
Furthermore, the prior patent 201710766435.0 states that the principle of the bubble breaker is that high-speed jet flows are used to achieve mutual collision of gases, and also states that the bubble breaker can be used in a micro-interface strengthening reactor to verify the correlation between the bubble breaker and the micro-interface generator; moreover, in the prior patent CN106187660, there is a related description on the specific structure of the bubble breaker, see paragraphs [0031] to [0041] in the specification, and the accompanying drawings, which illustrate the specific working principle of the bubble breaker S-2 in detail, the top of the bubble breaker is a liquid phase inlet, and the side of the bubble breaker is a gas phase inlet, and the liquid phase coming from the top provides the entrainment power, so as to achieve the effect of breaking into ultra-fine bubbles, and in the accompanying drawings, the bubble breaker is also seen to be of a tapered structure, and the diameter of the upper part is larger than that of the lower part, and also for better providing the entrainment power for the liquid phase.
Since the micro-interface generator was just developed in the early stage of the prior patent application, the micro-interface generator was named as a micro-bubble generator (CN201610641119.6), a bubble breaker (201710766435.0) and the like in the early stage, and is named as a micro-interface generator in the later stage along with the continuous technical improvement, and the micro-interface generator in the present invention is equivalent to the micro-bubble generator, the bubble breaker and the like in the prior art, and has different names. In summary, the micro-interface generator of the present invention belongs to the prior art.
Preferably, a liquid ejector is arranged in the reaction rectifying tower and communicated with the solvent and catalyst mixing inlet.
Preferably, the liquid jet is semicircle type, the bottom surface of liquid jet hugs closely on the lateral wall of reaction rectifying column, many liquid jet pipes have been laid in the liquid jet, liquid jet union coupling has the shower head, the shower head evenly distributed is on the semicircle face.
Preferably, the bottom surface of the liquid injector is in communication with the solvent and catalyst mixing inlet.
The liquid phase that gets into is catalyst and solvent mainly, in order to improve the catalytic effect of catalyst, disperses the inside of reaction rectifying column with the mode of liquid ejector injection with the catalyst, more can improve its reaction effect, especially has laid many liquid injection pipes in liquid ejector inside, and every liquid injection pipe is equivalent to a microchannel, and through carrying out the multichannel with the liquid phase and laying and spraying away with the mode of spraying, strengthened the interact with the gaseous phase. Therefore, the injection pipe arranged in the liquid injector plays a good flow guide role, so that after the liquid phase is better distributed, the micro-interface generator is adopted to disperse and crush the gas phase, and meanwhile, the purpose of carrying out corresponding micro-operation on the liquid phase is also realized.
Preferably, the reaction rectifying tower is sequentially connected with a rectifying reactor and a gas-liquid separation tank, and reactants after reaction in the rectifying reactor enter the gas-liquid separation tank for gas-liquid separation and purification.
Preferably, the top of the gas-liquid separation tank is connected with a gas phase return pipeline for separating the gas phase in the formic acid and returning the gas phase to the reaction rectifying tower.
Preferably, the gas-liquid separation tank is connected with a separation tower for further purifying and separating the materials extracted from the gas-liquid separation tank.
Preferably, the top of the separation tower and the top of the rectifying reactor are both provided with pipelines communicated with the gas phase return pipeline, so that the gas phase is returned to the reaction rectifying tower after being separated.
The rectifying reactor is arranged for further reacting the material from the top of the tower to improve the yield, then the material enters the gas-liquid separation tank, the gas phase separated from the gas-liquid separation tank mainly contains carbon dioxide and hydrogen, and the gas phase returns to the reactive rectifying tower to be reacted and utilized again. Similarly, the gas phase separated from the top into the separation column is mainly carbon dioxide and hydrogen, and can be returned for reuse.
In addition, the invention also provides a preparation method of formic acid, which comprises the following steps:
dispersing and crushing a mixed micro interface of hydrogen, carbon dioxide, a solvent and a catalyst, then carrying out hydrogenation reaction, and then carrying out gas-liquid separation to obtain formic acid, wherein the temperature of the hydrogenation reaction is 120-160 ℃, and the pressure of the hydrogenation reaction is 0.05-2 MPa.
Preferably, the solvent is a linear or branched alkane containing 10 to 16 carbons;
the catalyst is formate, and comprises one or more of copper formate, iron formate, cobalt formate, manganese formate and nickel formate;
the mass ratio of the solvent to the catalyst is (10:1) - (1000: 1).
Compared with the method for preparing formic acid by hydrogenating carbon dioxide in the prior art, the method disclosed by the invention uses formate which is very stable in formic acid as a catalyst, so that the stability of the catalyst in long-term use is ensured, and the stability of the reaction is further improved.
Compared with the prior art, the invention has the beneficial effects that:
(1) the reaction rectifying tower is arranged to promote the smooth reaction, so that the reaction is prevented from being promoted by adding organic or inorganic alkali, the process of preparing formic acid by acidification of formate is adopted, the reaction efficiency is improved, and the reaction operation is simplified;
(2) according to the micro-interface preparation system, the micro-interface generator in the reaction rectifying tower is used for efficiently crushing the entering gas phase into micron-sized bubbles, and the micron-sized bubbles are dispersed into the solvent and the catalyst to form a micro-interface system, so that the gas-liquid phase interface area in the gas-liquid reaction phase is increased by tens of times, and the mass transfer rate from the gas phase to the liquid phase is greatly increased;
(3) the method of the invention uses formate which is very stable in formic acid as a catalyst, thereby ensuring the stability of the catalyst in long-term use and further improving the stability of the reaction.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a micro-interface preparation system for formic acid according to example 1 of the present invention;
fig. 2 is a schematic structural diagram of a liquid ejector of the micro-interface preparation system for formic acid according to embodiment 1 of the present invention.
Description of the drawings:
10-a reactive distillation column; 101-a hydrogen inlet;
102-a carbon dioxide inlet; 103-solvent and catalyst mixing inlet;
104-a pneumatic micro-interface generator; a 105-formic acid outlet;
106-a liquid ejector; 1061-liquid jet tube;
1062-jet head; 107-a hydrodynamic micro-interface generator;
20-a gas-liquid separation tank; 30-a product tank;
40-a hydrogen storage tank; 50-a carbon dioxide storage tank;
60-solvent, catalyst storage tank; 70-fine reactor;
80-a separation column; 90-gas phase return line.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to more clearly illustrate the technical solution of the present invention, the following description is made in the form of specific embodiments.
Example 1
Referring to fig. 1, a system for preparing a micro interface of formic acid according to an embodiment of the present invention mainly includes a reactive distillation column 10, a rectifying reactor 70, a gas-liquid separation tank 20, and a separation column 80; the side wall of the reaction rectifying tower 10 is sequentially provided with a hydrogen inlet 101, a carbon dioxide inlet 102, a solvent and catalyst mixing inlet 103 from top to bottom, the solvent and catalyst mixing inlet 103 is arranged at the bottom of the reaction rectifying tower 10 to fill the whole reaction rectifying tower 10 with the entering solvent and catalyst, the top of the reaction rectifying tower 10 is provided with a formic acid outlet 105 for discharging formic acid, the formic acid from the formic acid outlet 105 subsequently enters the gas-liquid separation tank 20 for further purification, the hydrogen from the hydrogen inlet 101 is stored in the hydrogen storage tank 40, the carbon dioxide from the carbon dioxide inlet 102 is stored in the carbon dioxide storage tank 50, and the solvent and catalyst from the solvent and catalyst mixing inlet 103 are stored in the solvent and catalyst storage tank 60.
The inside of the reactive distillation tower 10 is provided with a pneumatic micro-interface generator 104 and a hydraulic micro-interface generator 107, the pneumatic micro-interface generator 104 is respectively arranged between tower plates, the hydraulic micro-interface generator 105 is arranged near the bottom of the reactive distillation tower 10, the hydraulic micro-interface generator 104 is communicated with the carbon dioxide inlet 102, and the pneumatic micro-interface generator 104 is communicated with the hydrogen inlet 101 for dispersing and crushing the entering hydrogen.
In addition, a liquid ejector 106 is arranged in the reaction rectifying tower 10, the liquid ejector 106 is communicated with the solvent and catalyst mixing inlet 103, the liquid ejector 106 is semicircular, the bottom surface of the liquid ejector 106 is tightly attached to the side wall of the reaction rectifying tower 10, a plurality of liquid ejecting pipes 1061 are distributed in the liquid ejector 106, the liquid ejecting pipes 1061 are connected with ejecting heads 1062, the ejecting heads 1062 are uniformly distributed on the semicircular surface, and the bottom surface of the liquid ejector 106 is communicated with the solvent and catalyst mixing inlet 103.
The formic acid product from the formic acid outlet 105 sequentially passes through the fine reactor 70 and the gas-liquid separation tank 20, the reactant after the reaction in the fine reactor 70 enters the gas-liquid separation tank 20 for gas-liquid separation and purification, the top of the gas-liquid separation tank 20 is connected with a gas-phase return pipeline 90 for separating the gas phase in the formic acid and returning the gas phase to the reactive distillation column 10, the gas-liquid separation tank 20 is connected with a separation column 80 for further purifying and separating the material extracted from the gas-liquid separation tank 20, and the tops of the separation column 80 and the fine reactor 70 are both provided with pipelines communicated with the gas-phase return pipeline 90 for separating the gas phase and returning the gas phase to the reactive distillation column 10.
In the specific formic acid preparation process, 200ml of n-dodecane and 10g of copper formate are added into a tower kettle of a reactive distillation tower 10, carbon dioxide and vacuum displacement is carried out for 3 times, then carbon dioxide is introduced to 2MPa, hydrogen is introduced to 2MPa, the tower kettle is heated to 120 ℃, reaction is carried out for 8 hours, 3.7g of liquid is collected at the tower top, the formic acid content is 98.9% through nuclear magnetism calibration, the liquid collected at the tower top is subjected to gas-liquid separation through a rectifying reactor and a gas-liquid separation tank 20 in sequence, and the product obtained through gas-liquid separation is stored in a product tank 30 after passing through a separation tower.
Examples 2 to 5
The other operating steps are identical to those of example 1, except that the reaction is carried out with different catalysts, the results being shown in table 1:
TABLE 1 results of reactions using different catalysts
| Examples | 2 | 3 | 4 | 5 |
| Catalyst and process for preparing same | Iron formate | Cobalt formate | Manganese formate | Nickel formate |
| Overhead liquid (g) | 2.8 | 4.4 | 1.6 | 2.0 |
| Formic acid content (%) | 98.5 | 98.3 | 98.8 | 98.9 |
Examples 6 to 10
The other operating steps are identical to those of example 1, except that the reaction is carried out using different solvents, the results being shown in table 2:
TABLE 2 reaction results using different solvents
| Examples | 6 | 7 | 8 | 9 | 10 |
| Solvent(s) | N-decane | Isododecane | N-tetradecane | Isotetradecane | N-hexadecane |
| Overhead liquid (g) | 3.4 | 3.8 | 3.7 | 3.7 | 3.9 |
| Formic acid content (%) | 96.6 | 98.7 | 98.6 | 98.6 | 98.9 |
Examples 11 to 13
The other operating steps are identical to those of example 1, except that the reaction is carried out at different temperatures, the results being shown in Table 3:
TABLE 3 results of reactions using different temperatures
| Examples | 11 | 12 | 13 |
| Temperature (. degree.C.) | 130 | 140 | 160 |
| Overhead liquid (g) | 2.3 | 2.9 | 3.3 |
| Formic acid content (%) | 99.2 | 98.9 | 98.7 |
Example 14
The other operation steps are the same as example 1, except that carbon dioxide is introduced to 0.05MPa, then hydrogen is introduced to 0.05MPa, 3.3g of liquid is collected at the top of the tower, and the content of formic acid is calibrated to 97.5% by nuclear magnetism.
In the above embodiment, in order to increase the dispersion and mass transfer effects, an additional micro interface generator may be additionally provided, the installation position is not limited, and the micro interface generator may be external or internal, and when the micro interface generator is internal, the micro interface generator may be installed on the side wall inside the reactive distillation column 10, and the micro interface generator may be installed on the side wall to generate the opposite collision.
In the above embodiment, the number of the pump bodies is not specifically required, and the pump bodies may be arranged at corresponding positions as required.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A micro-interface preparation system of formic acid is characterized by comprising: the side wall of the reactive distillation tower is sequentially provided with a hydrogen inlet, a carbon dioxide inlet and a mixed inlet of a solvent and a catalyst from top to bottom;
the reaction rectifying tower is internally provided with a pneumatic micro-interface generator and a hydraulic micro-interface generator, the pneumatic micro-interface generator is arranged between tower plates in the reaction rectifying tower and communicated with a hydrogen inlet for dispersing and crushing the entering hydrogen, the hydraulic micro-interface generator is arranged at the bottom close to the reaction rectifying tower and communicated with a carbon dioxide inlet for dispersing and crushing the entering carbon dioxide, and the micro-interface generator is arranged in a downcomer inside the reaction rectifying tower;
the mixed inlet of the solvent and the catalyst is arranged at the bottom of the reaction rectifying tower and is used for filling the whole reaction rectifying tower with the entering solvent and catalyst;
the top of the reaction rectifying tower is provided with a formic acid outlet for discharging the product formic acid, and the formic acid discharged from the formic acid outlet is further subjected to reaction and purification.
2. The system of claim 1, wherein the reactive distillation column is sequentially connected to a rectifying reactor and a gas-liquid separation tank, and the reactant obtained from the rectifying reactor enters the gas-liquid separation tank for gas-liquid separation and purification.
3. The micro-interface preparation system according to claim 2, wherein a gas phase return pipeline is connected to the top of the gas-liquid separation tank for separating the gas phase in the formic acid and returning the separated gas phase to the reactive distillation column.
4. The system of claim 3, wherein the knock-out pot is connected to a separation column for further purification and separation of the material withdrawn from the knock-out pot.
5. The system of claim 4, wherein the top of the separation column and the top of the rectifying reactor are provided with pipelines communicated with the gas phase return pipeline, so as to separate the gas phase and return the gas phase to the reactive rectifying column.
6. The system as claimed in any one of claims 1 to 5, wherein a liquid injector is disposed in the reactive distillation column, and the liquid injector is communicated with the mixed inlet of the solvent and the catalyst.
7. The micro-interface preparation system according to claim 6, wherein the liquid injector is semi-circular, the bottom surface of the liquid injector is tightly attached to the side wall of the reaction rectification tower, a plurality of liquid injection pipes are arranged in the liquid injector, the liquid injection pipes are connected with injection heads, and the injection heads are uniformly distributed on the semi-circular surface.
8. The system of claim 7, wherein a bottom surface of the liquid injector communicates with the solvent and catalyst mixing inlet.
9. A method for preparing a system for micro-interfacial preparation of formic acid according to any of claims 1 to 8, comprising the steps of:
dispersing and crushing a mixed micro interface of hydrogen, carbon dioxide, a solvent and a catalyst, then carrying out hydrogenation reaction, and then carrying out gas-liquid separation to obtain formic acid, wherein the temperature of the hydrogenation reaction is 120-160 ℃, and the pressure of the hydrogenation reaction is 0.05-2 MPa.
10. The method of claim 9, wherein the solvent is a linear or branched alkane having 10 to 16 carbons;
the catalyst is formate, and comprises one or more of copper formate, iron formate, cobalt formate, manganese formate and nickel formate;
the mass ratio of the solvent to the catalyst is (10:1) - (1000: 1).
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| CN113563195A (en) * | 2021-07-16 | 2021-10-29 | 南京延长反应技术研究院有限公司 | System and method for preparing DMC |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113563195A (en) * | 2021-07-16 | 2021-10-29 | 南京延长反应技术研究院有限公司 | System and method for preparing DMC |
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