CN108658754A - A kind of device and technique of continuous production 2,2- dimethylolpropionic acids - Google Patents
A kind of device and technique of continuous production 2,2- dimethylolpropionic acids Download PDFInfo
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- CN108658754A CN108658754A CN201810637653.9A CN201810637653A CN108658754A CN 108658754 A CN108658754 A CN 108658754A CN 201810637653 A CN201810637653 A CN 201810637653A CN 108658754 A CN108658754 A CN 108658754A
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- C07—ORGANIC CHEMISTRY
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- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/285—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with peroxy-compounds
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- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
- C07C45/67—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
- C07C45/68—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
- C07C45/72—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction of compounds containing >C = O groups with the same or other compounds containing >C = O groups
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Abstract
The present invention relates to a kind of continuous productions 2, the device and technique of 2 dimethylolpropionic acids, n-butanal and formaldehyde are condensed through the first chip seedpod of the lotus microreactor continuous catalysis, and condensation product with hydrogen peroxide carries out continuous oxidation after being neutralized with formic acid in the second chip seedpod of the lotus microreactor；Oxidation product such as is acidified through dilute sulfuric acid, recrystallizes after crystallization, centrifugation, methanol sulfuric acid sodium, decoloration, recycling design after triple effect concentration, centrifuges, dries and be sieved again at the refinement treatments, obtains 2,2 dimethylolpropionic acid products.First, second chip seedpod of the lotus microreactor of the invention is respectively composed in series by 5~6,6~8 stage piece formula seedpod of the lotus microreactors, wherein condensation and oxidation are continuous reaction, process units floor space is small, process stabilizing is simultaneously easy to control, and conversion rate of products is high, and low energy consumption, pollutant discharge amount is small, labor intensity is low, production safety, and production cost is low.
Description
Technical field
A kind of continuous production 2 of the present invention, the device and technique of 2- dimethylolpropionic acids particularly belong to organic chemical industry's technology neck
Domain.
Background technology
2,2- dimethylolpropionic acids are in molecule containing there are two the polyfunctional compound of primary hydroxyl and a carboxyl, this points
Son has alcohols and has the characteristic of acid compounds, and lipophilic carbon backbone structure and hydrophilic structure of functional groups make it have
Unique solubility property becomes a kind of excellent crosslinking agent and fine-chemical intermediate.Utilize this characteristic, 2,2- dihydroxymethyls
Butyric acid can be applied to prepare soluble polyurethane, polyester, epoxy resin etc., be a kind of novel green chemicals.In addition, by
It is low in 2,2- dimethylolpropionic acid fusing points, it is soluble in the ketones solvent using acetone as representative, and grasp when preparing aqueous polyurethane
Make it is functional, so even if being growing if its purposes of the field other than water-based system.
Due to the difficulty in technology of preparing, the research report of related 2,2- dimethylolpropionic acids synthesis is seldom at present, success
The case for implementing industrialization is less.Previously once there is the report of Japan's chemical conversion company industry metaplasia production 2,2- dimethylolpropionic acids,
It is reported that the said firm in the end of the year in 2005 stop production, by technology, facility transfer to Sweden Bai Situo (Perstrop) company, but
Bai Situo companies also only produced for 3 years and will also announce to stop production in the end of the year in 2009.China had Nancheng red in 2008
All reports of Chemical Industry Science Co., Ltd's production 2,2- dimethylolpropionic acids, but the said firm also stopped production in 2013.
Mainly method carries out synthesis 2,2- dimethylolpropionic acids in two steps both at home and abroad at present.First, depositing in basic catalyst
Under, formaldehyde and butyraldehyde carry out aldol reaction, generate 2,2- dihydroxymethyl butyraldehyde；Second is that being again oxidation with hydrogen peroxide
Agent obtains 2,2- dimethylolpropionic acids by the oxidation of 2,2- dihydroxymethyl butyraldehyde, crystallization, recrystallization etc., and wherein aldol condensation is anti-
Should be the committed step of two-step method, basic catalyst mostly uses inorganic base (Na2CO3, NaOH), organic base (triethylamine) etc..By
In there are the side reactions such as cannizzaro's reaction in condensation reaction, causes the pH value of reaction system to change larger, exist
The problems such as catalyst choice is poor, reactivity is poor, product yield is low.
In above-mentioned domestic and international two-step method synthesis 2,2- dimethylolpropionic acids, condensation and oxidation reaction are all in reaction kettle
It carries out, entire building-up process is all intermittent, and process route is complicated, and high energy consumption, environmental pollution is serious, and not meeting from source has
Effect reduces the mentality of designing of the Green Chemistry of pollution.
The patent " preparation method of one kind 2,2- dimethylolpropionic acids " of Publication No. CN101279912 is two-step method life
2,2- dimethylolpropionic acids are produced, wherein aldol reaction and oxidation reaction carries out in glass-lined kettle respectively, between being typical
Formula of having a rest production technology.Used catalyst is mixed base (Na2CO3+NaOH).Practical application shows that the technique is unstable, and control is difficult,
Conversion ratio is low, and complex process, high energy consumption, pollutant emission is serious, and production cost is high, does not meet from source and effectively reduces pollutant
The mentality of designing of the green chemical of discharge.A kind of patent " conjunction of 2,2- dimethylolpropionic acids of Publication No. CN101381299
At method " and intermittent two-step method production technology, except that catalyst is Na2CO3、Ba(OH)2, triethylamine with
Na2CO3Mixture or triethylamine and Ba (OH)2Mixture, also there are no the report using the technique industrialization so far.It is public
The number of opening is the patent " preparation method of one kind 2,2- dimethylolpropionic acids " of CN106008202A, mainly from improvement aldol condensation
The catalyst of reaction is set about, and pretreated alkalescence anion-exchange resin is added to the ion friendship for having been loaded with a certain amount of water
Change in column, the outer wall for beaing pillar enable that resin fills it is compact the temperature of pillar is uniformly controlled with thermostatic water-circulator bath, will
A certain proportion of n-butanal, formaldehyde and solvent after mixing, are added under certain air speed in ion exchange column, carry out hydroxyl
Aldehyde condensation reaction obtains 2,2- dihydroxymethyl butyraldehyde.This method does not have practicability industrially, and does not still escape interval
Various drawbacks caused by formula technique.
Industry at this stage is studied all based on the batch process of two-step method prepared by 2,2- dimethylolpropionic acids, more
It concentrates in the optimization of aldol reaction condition, but all because of the presence of the side reactions such as cannizzaro's reaction so that production technology
The problems such as bad control, process optimization degree is poor, product yield is low, energy consumption is big, pollutant emission is serious, is unresolved.And
And that there is also occupation area of equipment is big, labor intensity is big, production cost is high, security risk is more, expands production not for batch process
The problems such as being easy.
Invention content
For the shortcomings of the prior art, the present invention provide it is a kind of can continuous, high income, safety and environmental protection 2,
The device and technique of 2- dimethylolpropionic acids.
The device and technique of a kind of continuous production 2,2- dimethylolpropionic acids of the present invention are to come by the following technical programs in fact
Existing：
Described device is by raw material storage tank, metering pump, the first chip seedpod of the lotus microreactor, condensation liquid collecting tank, the second chip
Seedpod of the lotus microreactor, condenser, recrystallizes kettle, centrifuge, double conic rotary vacuum dryer and shakes triple-effect continuous evaporative crystallizer
Dynamic screen banks at；The first, second chip seedpod of the lotus microreactor is connected by 5~6,6~8 stage piece formula seedpod of the lotus microreactors respectively
It forms, reacting pipe, hot water pipeline and the cold water pipes in chip seedpod of the lotus microreactor are arranged at the centre of supporting base material, are in
It is laid with back and forth, spaced set seedpod of the lotus distributor in reacting pipe；The seedpod of the lotus distributor is by single tube group seedpod of the lotus shape in pairs, the seedpod of the lotus
The distance between both ends end face single tube 8mm, end face diameter 20mm, the height 360mm of the single head seedpod of the lotus consistent with reacting pipe,
The spacing 500mm of two seedpod of the lotus distributors in reacting pipe.
The technique：
Aqueous catalyst solution, 99wt% n-butanals, 37wt% formaldehyde are connected by raw material storage tank respectively through respectively metering pump-metered
Enter in the first chip seedpod of the lotus microreactor continuously and carries out condensation reaction.
The discharge pipe of condensation product is communicated with 85wt% formic acid pipelines in first chip seedpod of the lotus microreactor, condensation product
With 85wt% formic acid after premixing, into neutralization reaction is carried out in the condensation liquid collecting tank with stirring, intermediate dihydroxy is obtained
Methylbutyraldehyd condensation liquid；A methylol butyraldehyde by-product, 2- ethyl acrylic aldehydes and the unreacted formaldehyde and n-butanal of effusion are logical
It crosses collecting tank top duct and enters condenser recycling.
The discharge pipe that condensation liquid collects trench bottom is communicated with dioxygen waterpipe, dihydroxymethyl butyraldehyde condensation liquid and 35wt%
Dioxygen continuously enters in the second chip seedpod of the lotus microreactor after pipeline is pre-mixed and carries out oxidation reaction；
The discharge pipe of the bottom of second chip seedpod of the lotus microreactor is communicated with sulfuric acid pipeline, oxidation product and dilute sulfuric acid warp
Enter condensing crystallizing in triple-effect continuous evaporative crystallizer after pipeline premixing, and is centrifuged, obtained 2,2- dihydroxymethyls
Butyric acid crude product is respectively by methanol stripper sodium sulphate, decoloration, recrystallization processing, then is centrifuged, dries and is sieved, and obtains 2,
2- dimethylolpropionic acid products；It centrifuges the mother liquor generated to be reprocessed, recycles 2,2- dimethylolpropionic acids therein.
In the first chip seedpod of the lotus microreactor：The stream of aqueous catalyst solution, 37wt% formaldehyde and 99wt% n-butanals
Amount is respectively 483.30L/h, 433.40L/h, 209.00L/h, 0.3~1.2m/s of flow velocity of above-mentioned three kinds of materials, reaction temperature
60~100 DEG C, 0.2~0.8MPa of pressure, 15~30s of material flow time；The aqueous catalyst solution is by Na2CO3∶NaOH∶
Triethylamine: water is formulated for 2.4: 1: 1.5: 180 in mass ratio.
In the condensation liquid collecting tank：It stirs 90 DEG C of neutral temperature, neutralize time 0.5h.
In the second chip seedpod of the lotus microreactor：Dihydroxymethyl butyraldehyde condensation liquid, hydrogen peroxide flow be respectively
The flow velocity of 1108.50L/h, 240.35L/h, two kinds of materials are 0.3~1.2m/s；80~100 DEG C of oxidizing temperature, pressure 0.2
~0.8MPa, 15~30s of material flow time.
The dilution heat of sulfuric acid is configured by 98wt% sulfuric acid, water according to 1: 11 mass ratio.
Supporting base material in the chip seedpod of the lotus microreactor is 304 stainless steels, reacting pipe, seedpod of the lotus distributor, hot water
Pipeline and cold water pipe are 316 stainless steels.
Beneficial effects of the present invention：
1, condensation and oxidation reaction are all made of chip seedpod of the lotus microreactor, and reacting pipe moderate distance is arranged the seedpod of the lotus and distributes
Device, can effectively improve the flow velocity of fluid, and reaction raw materials mix evenly, more fully；It is fiercer to react under a certain pressure, can be
It is fully reacted in short time；The concentration on each section that material flows through, temperature base are in homogeneous, close to laminar flow；
Conversion ratio on each section is also identical, and can control suitable temperature and flow, and product yield is high.
2, the condensation reaction of n-butanal and formaldehyde uses continuous reaction, compared with traditional still reaction, reaction temperature
Stablize, best reaction temperature, and pH stable can be obtained, reaction speed can be greatly improved, greatly shorten the reaction time, saves
Energy consumption, alleviates labor intensity, and production environment is greatly improved.
3, the oxidation of 2,2- dihydroxymethyls butyraldehyde is also to use continuous reaction, compared with traditional still reaction, reaction
Temperature is stablized, and substantially reduces the production cycle, improves production environment, energy-saving consumption-reducing, product yield can be improved 20% or more.
4, so that reaction condition is easily optimized using continuous reaction, easily realize automation and computer control, can realize 1-2 people's vehicle
Between overall process operate, workshop labor is greatly saved, production security also greatly improves.
5, condensation and oxidation reaction are all made of chip seedpod of the lotus microreactor, and occupation area of equipment is greatly decreased, tens square meters
The alternative former tank reactor of chip seedpod of the lotus microreactor area the hundreds of even occupation of land of thousands of sides, expand production easily.
6, residues of formaldehyde is greatly decreased, and dioxygen water consumption is also reduced, and pollutant total release is greatly reduced, and wastewater flow rate only has
30% or so of former tank reactor.
Description of the drawings
Fig. 1 is continuous production 2,2- dimethylolpropionic acid process flow charts of the present invention；
Fig. 2 is chip seedpod of the lotus microreactor structural schematic diagram of the present invention；
In figure：1, reacting pipe；2, hot water pipeline；3, cold water pipes；4, supporting base material；5, seedpod of the lotus distributor；
Fig. 3 is seedpod of the lotus dispensing arrangement figure of the present invention；
Wherein：Dimensional units are millimeter；
Fig. 4 is seedpod of the lotus distributor of the present invention in reacting pipe position schematic diagram；
In figure：Dimensional units are millimeter.
Specific implementation mode
Specific implementation mode is described in detail in the present invention.
Embodiment 1
A kind of using the technique and device of chip seedpod of the lotus microreactor continuous production 2,2- dimethylolpropionic acids is that will urge
Each personal positive battery metering pump of agent aqueous solution, n-butanal, formaldehyde is squeezed into chip seedpod of the lotus microreactor by design discharge and is carried out continuously
Change condensation reaction.
Condensation is composed in parallel with the first chip seedpod of the lotus microreactor by 5 groups of chip seedpod of the lotus microreactors, the flow velocity of each solution
It is carried out by 1m/s, the flow Q of catalystCatalyst=483.30L/h；The flow Q of formaldehydeFormaldehyde=433.40L/h；The flow of n-butanal
QN-butanal=209.00L/h.The flow of formic acid is QFormic acid=14.80L/h；It is 60 DEG C to control condensation temp.Stay in the condensation of collecting tank
Liquid (dihydroxymethyl butyraldehyde) squeezes into serialization chip seedpod of the lotus microreactor with each personal positive battery metering pump of hydrogen peroxide and carries out serialization
Oxidation reaction.
Oxidation is made of with the second chip seedpod of the lotus microreactor 7 groups of chip seedpod of the lotus microreactors, and the flow velocity of two solution presses 1m/
S, the flow Q of condensation liquidCondensation liquid=1108.50L/h；The flow Q of hydrogen peroxideHydrogen peroxide=240.35L/h；The content of hydrogen peroxide is
35%.Control 80 DEG C of oxidizing temperature.Oxidation product is acidified Q through dilute sulfuric acidDilute sulfuric acidIt is evaporated again through triple effect serialization after=376.20L/h
Crystallization, centrifugation, refined (except sodium, decoloration, precipitation, recrystallization, centrifugation, drying, being sieved) qualified 2,2- dimethylolpropionic acids at
Product.Centrifuge mother liquor is further recycled.It is 65.28% relative to n-butanal molar product yield.
Embodiment 2
Condensation is composed in parallel with the first chip seedpod of the lotus microreactor by 5 groups of chip seedpod of the lotus microreactors, the flow velocity of each solution
It is carried out by 0.3m/s, the flow Q of catalystCatalyst=145.00L/h；The flow Q of formaldehydeFormaldehyde=130.00L/h；The stream of n-butanal
Measure QN-butanal=62.70L/h.The flow of formic acid is QFormic acid=4.50L/h；It is 70 DEG C to control condensation temp.Stay in the condensation of collecting tank
Liquid (dihydroxymethyl butyraldehyde) squeezes into serialization chip seedpod of the lotus microreactor with each personal positive battery metering pump of hydrogen peroxide and carries out serialization
Oxidation reaction.
Oxidation is composed in parallel with the second chip seedpod of the lotus microreactor by 7 pack sheet arranged seedpod of the lotus microreactors, two solution
Flow velocity is carried out by 0.3m/s, the flow Q of condensation liquidCondensation liquid=332.55L/h；The flow Q of hydrogen peroxideHydrogen peroxide=72.11L/h；Dioxygen
The content of water is 35%, controls 85 DEG C of oxidizing temperature.Oxidation product is acidified Q through dilute sulfuric acidDilute sulfuric acidAgain through triple effect after=112.86L/h
Serialization evaporative crystallization, centrifugation, refined (except sodium, decoloration, precipitation, recrystallization, centrifugation, drying, being sieved) obtain qualified 2,2- dihydroxies
Methylbutanoic acid finished product, centrifuge mother liquor are further recycled.It is 68.2% relative to n-butanal molar product yield.
Embodiment 3
Condensation is composed in parallel with the first chip seedpod of the lotus microreactor by 5 groups of chip seedpod of the lotus microreactors, the flow velocity of each solution
It is carried out by 0.6m/s, the flow Q of catalystCatalyst=290.00L/h；The flow Q of formaldehydeFormaldehyde=260.00L/h；The stream of n-butanal
Measure QN-butanal=125.40L/h.The flow of formic acid is QFormic acid=9.00L/h；It is 80 DEG C to control condensation temp.Stay in the contracting of collecting tank
It closes liquid (dihydroxymethyl butyraldehyde) and squeezes into the progress of serialization chip seedpod of the lotus microreactor continuously with each personal positive battery metering pump of hydrogen peroxide
Oxidation.
Oxidation is composed in parallel with the second chip seedpod of the lotus microreactor by 8 groups of chip seedpod of the lotus microreactors, the flow velocity of two solution
It is carried out by 0.6m/s, the flow Q of condensation liquidCondensation liquid=665.10L/h；The flow Q of hydrogen peroxideHydrogen peroxide=144.20L/h；Hydrogen peroxide
Content is 35%, controls 90 DEG C of oxidizing temperature.Oxidation product is acidified Q through dilute sulfuric acidDilute sulfuric acidIt is continuous through triple effect again after=225.72L/h
Change evaporative crystallization, centrifugation, refined (except sodium, decoloration, precipitation, recrystallization, centrifugation, drying, being sieved) obtain qualified 2,2- dihydroxymethyls
Butyric acid finished product.Centrifuge mother liquor is further recycled.It is 67.6% relative to n-butanal molar product yield.
Embodiment 4
Condensation is composed in parallel with the first chip seedpod of the lotus microreactor by 5 groups of chip seedpod of the lotus microreactors, the flow velocity of each solution
It is carried out by 0.8m/s, the flow Q of catalystCatalyst=386.65L/h；The flow Q of formaldehydeFormaldehyde=347.00L/h；The stream of n-butanal
Measure QN-butanal=167.20L/h.The flow of formic acid is QFormic acid=12.00L/h；It is 90 DEG C to control condensation temp.Stay in the contracting of collecting tank
It closes liquid (dihydroxymethyl butyraldehyde) and squeezes into the progress of serialization chip seedpod of the lotus microreactor continuously with each personal positive battery metering pump of hydrogen peroxide
Oxidation.
Oxidation is composed in parallel with the second chip seedpod of the lotus microreactor by 8 groups of chip seedpod of the lotus microreactors, the flow velocity of two solution
It is carried out by 0.8m/s, the flow Q of condensation liquidCondensation liquid=886.80L/h；The flow Q of hydrogen peroxideHydrogen peroxide=192.28L/h；Hydrogen peroxide
Content is 35%, controls 95 DEG C of oxidizing temperature.Oxidation product is acidified Q through dilute sulfuric acidDilute sulfuric acidIt is continuous through triple effect again after=301.00L/h
Change evaporative crystallization, centrifugation, refined (except sodium, decoloration, precipitation, recrystallization, centrifugation, drying, being sieved) obtain qualified 2,2- dihydroxymethyls
Butyric acid finished product, centrifuge mother liquor are further recycled.It is 66.3% relative to n-butanal molar product yield.
Claims (2)
1. a kind of continuous production 2, the device and technique of 2- dimethylolpropionic acids, it is characterised in that：Described device by raw material storage tank,
Metering pump, the first chip seedpod of the lotus microreactor, condensation liquid collecting tank, the second chip seedpod of the lotus microreactor, triple-effect continuous evaporative knot
Brilliant device, condenser, recrystallization kettle, centrifuge, double conic rotary vacuum dryer and vibrating screen composition；First, second chip
Seedpod of the lotus microreactor is composed in series by 5~6,6~8 stage piece formula seedpod of the lotus microreactors respectively, in chip seedpod of the lotus microreactor
Reacting pipe, hot water pipeline and cold water pipes are arranged at the centre of supporting base material, in being laid with back and forth, in reacting pipe equidistantly
Seedpod of the lotus distributor is set；The seedpod of the lotus distributor is by single tube group seedpod of the lotus shape in pairs, the distance between both ends end face single tube of the seedpod of the lotus
8mm, end face diameter 20mm, the height 360mm of the single head seedpod of the lotus consistent with reacting pipe, two seedpod of the lotus distributors in reacting pipe
Spacing 500mm；
The technique：
Aqueous catalyst solution, 99wt% n-butanals, 37wt% formaldehyde are through respectively metering pump-metered, respectively continuously by raw material storage tank
Into carrying out condensation reaction in the first chip seedpod of the lotus microreactor；
The discharge pipe of condensation product is communicated with 85wt% formic acid pipelines in first chip seedpod of the lotus microreactor, condensation product with
85wt% formic acid, into neutralization reaction is carried out in the condensation liquid collecting tank with stirring, obtains intermediate dihydroxy first after premixing
Base butyraldehyde condensation liquid；A methylol butyraldehyde by-product, 2- ethyl acrylic aldehydes and the unreacted formaldehyde and n-butanal of effusion pass through
Collecting tank top duct enters condenser recycling；
The discharge pipe that condensation liquid collects trench bottom is communicated with dioxygen waterpipe, dihydroxymethyl butyraldehyde condensation liquid and 35wt% dioxygens
After pipeline is pre-mixed, continuously enters in the second chip seedpod of the lotus microreactor and carry out oxidation reaction；
The discharge pipe of the bottom of second chip seedpod of the lotus microreactor is communicated with sulfuric acid pipeline, and oxidation product and dilute sulfuric acid are through pipeline
Enter condensing crystallizing in triple-effect continuous evaporative crystallizer after premixing, and is centrifuged, obtained 2,2- dimethylolpropionic acids
Crude product is respectively by methanol stripper sodium sulphate, decoloration, recrystallization processing, then is centrifuged, dries and is sieved, and obtains 2,2- bis-
Hydroxymethylbutyrate product；It centrifuges the mother liquor generated to be reprocessed, recycles 2,2- dimethylolpropionic acids therein；
In the first chip seedpod of the lotus microreactor：The flow of aqueous catalyst solution, 37wt% formaldehyde and 99wt% n-butanals point
Not Wei 483.30L/h, 433.40L/h, 209.00L/h, 0.3~1.2m/s of flow velocity of above-mentioned three kinds of materials, reaction temperature 60~
100 DEG C, 0.2~0.8MPa of pressure, 15~30s of material flow time；The aqueous catalyst solution is by Na2CO3: NaOH: three second
Amine: water is formulated for 2.4: 1: 1.5: 180 in mass ratio；
In the condensation liquid collecting tank：It stirs 90 DEG C of neutral temperature, neutralize time 0.5h；
In the second chip seedpod of the lotus microreactor：Dihydroxymethyl butyraldehyde condensation liquid, hydrogen peroxide flow be respectively 1108.50L/
H, the flow velocity of 240.35L/h, two kinds of materials are 0.3~1.2m/s；80~100 DEG C, 0.2~0.8MPa of pressure of oxidizing temperature,
15~30s of material flow time；
The dilution heat of sulfuric acid is configured by 98wt% sulfuric acid, water according to 1: 11 mass ratio.
2. a kind of continuous production 2 according to claim 1, the device and technique of 2- dimethylolpropionic acids, it is characterised in that：
Supporting base material in the chip seedpod of the lotus microreactor is 304 stainless steels, reacting pipe, seedpod of the lotus distributor, hot water pipeline and cold
Water pipe is 316 stainless steels.
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