CN102491896A - Clean production method of dipropylene glycol diacrylate (DPGDA) or tripropylene glycol diacrylate (TPGDA) - Google Patents
Clean production method of dipropylene glycol diacrylate (DPGDA) or tripropylene glycol diacrylate (TPGDA) Download PDFInfo
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Abstract
The invention which belongs to the light-cured material field relates to a clean production method of DPGDA or TPGDA. The method concretely comprises the following steps: 1, carrying out esterification reflux dehydration on dipropylene glycol/tripropylene glycol, acrylic acid, a catalyst, a solvent, a polymerization inhibitor and an antioxidant; 2, adding sodium hydroxide and a small amount of water to neutralize; 3, adding a magnesium polysilicate adsorbent to adsorb a salt generated through neutralization; 4, carrying out reduced pressure dehydration and desolventization; 5, press-filtering to filter out magnesium polysilicate and the salt absorbed thereby; 6, adding alkaline calcium bentonit and calcium oxide to decolor, remove trace water and remove trace acids; 7, press-filtering; and 8, carrying out product index detection. The clean production method of the DPGDA or the TPGDA of the invention, which has the advantages of high yield, economic benefit possessing and environmental benefit possessing, fundamentally solves an organic wastewater pollution problem in the production process of the DPGDA or the TPGDA.
Description
Technical field
The invention belongs to the photo-curing material field, relate to the clean preparation method of propylene glycol diacrylate or tri (propylene glycol) diacrylate.
Background technology
Along with developing rapidly and the strictness restriction of legislations of environmental protection to solvent of science and technology, the photocuring macromolecular material more and more receives people's attention.Photo-curing material have quick solidifying, energy consumption low, pollute less, premium properties such as efficient height, thereby be widely used in fields such as coating, printing and electronic industry, development in recent years is rapid.Propylene glycol diacrylate (DPGDA), tri (propylene glycol) diacrylate (TPGDA) are one type of novel photo-curing material---multifunctional light curing monomers; Have LV, low stimulate, premium propertiess such as curing speed is fast, dilution property is strong, high transparent; Be widely used in fields such as light-curable ink, coating, tackiness agent, extensive in the U.S., Japan, European flourishing countries use.In recent years, along with the rise of UV-curing technology in China, the new type light solidify material is more and more wider as the raw material purposes of UV coating, printing ink, tackiness agent, and usage quantity is increasing year by year.
Yet existing propenoate working method normally adopts first esterification, neutralizes, washes excessive vinylformic acid then, again the traditional technology route of desolventizing.This working method exists three big defectives:
1. catalyst system therefor adopts catalyzer such as sulfuric acid, tosic acid, methanesulfonic mostly, adopts neutralization, washing, stratified method to remove usually, can produce a large amount of industrial organic waste waters, and water body environment is polluted;
2. the vinylformic acid of excessive in the reaction process (8%-15%) is water-washed away entirely, adopts neutralization, washing, stratified method to remove usually, can produce the industrial organic waste water of a large amount of high COD, and problem such as hard to manage and processing costs height makes cost of goods manifactured higher;
3. neutralize, can take away part propylene acid esters product when washing, yield is descended, cost rises.
According to the requirement of cleaner Production in Chemical Industry, the conventional production methods of propenoate must be improved.
Summary of the invention
Technical problem to be solved by this invention is the above-mentioned deficiency to prior art, and the clean preparation method of a kind of propylene glycol diacrylate (DPGDA) or tri (propylene glycol) diacrylate (TPGDA) is provided.
The clean preparation method of a kind of propylene glycol diacrylate or tri (propylene glycol) diacrylate, this working method comprises following steps:
(1) the whole raw materials of proportioning input of esterification: press dipropylene glycol or tripropylene glycol: vinylformic acid: catalyzer: solvent: stopper: oxidation inhibitor=1 (mol): 2-2.5 (mol): 5-50 (g): 60-400 (g): 0.3-5 (g): 0.2-5 (g); In still, feed the mixed air of pressurized air or air and nitrogen continuously; Be warming up to 70-120 ℃ of beginning reflux dewatering, when reflux dewatering to anhydrous when going out, reaction finishes; Detect acid number, and be cooled to≤40 ℃;
(2) neutralization: add sheet alkali and water and neutralize;
(3) absorption: add in the multi-silicate magnesium adsorbents adsorb and the salt that generates;
(4) dehydration, precipitation: underpressure distillation dehydration, desolventizing, and recycle-water and solvent; The water that is reclaimed without any need for handle can be directly in next time with the time use; Institute's recovered solvent can be directly uses when esterification next time;
(5) filter: press filtration filters out the salt of multi-silicate magnesium and absorption thereof;
(6) decolouring: add alkaline calcium bentonite, quicklime, decolour, take off minor amount of water, take off trace acid;
(7) filter: press filtration filters out alkaline calcium bentonite, quicklime;
(8) product index detects: outward appearance: limpid hyalomucoid, ester content>=98%, acid number≤1mgKOH, colourity≤50APHA, water ratio≤0.2%.
In the wherein said esterification preferably according to dipropylene glycol or tripropylene glycol: the whole raw materials of proportioning input of vinylformic acid: catalyzer: solvent: stopper: oxidation inhibitor=1 (mol): 2.15-2.3 (mol): 5-50 (g): 60-400 (g): 0.5-5 (g): 0.2-5 (g); Further preferably according to dipropylene glycol or tripropylene glycol: the whole raw materials of proportioning input of vinylformic acid: catalyzer: solvent: stopper: oxidation inhibitor=1 (mol): 2.2-2.3 (mol): 5-50 (g): 70-400 (g): 1.2-5 (g): 0.35-5 (g).
Described catalyzer is wherein a kind of of tosic acid, Phenylsulfonic acid, methanesulfonic, or two kinds arbitrary proportion miscellany, or three kinds arbitrary proportion miscellany.
The used solvent of described esterification is one or both in normal hexane, normal heptane, benzene, toluene, hexanaphthene, methylcyclohexane, the ethyl cyclopentane, or two or more miscellanys; In preferred toluene, hexanaphthene, the methylcyclohexane one or both, or two or more miscellanys.
The used stopper of described esterification is a MEHQ.
The used oxidation inhibitor of described esterification is the miscellany of one or both arbitrary proportions in Hypophosporous Acid, 50, the sodium hypophosphite.
Adding the sheet alkali of the 1%～3wt% account for each raw materials quality summation of described esterification and the water of 2%～10wt% in the described neutralization procedure neutralizes.
The salt that adds the multi-silicate magnesium absorption neutralization procedure generation of the 0.1%～1.0wt% that accounts for each raw materials quality summation of esterification in the described adsorption step.Described multi-silicate magnesium chemical name is a synthetic magnesium silicate, molecular formula: 2MgO6SiO
2NH
2O (n=0-6) is the commercially available prod, like clean magnificent chemical industry ltd of East China, Wuhan chemical industry ltd, Shangyu etc. production and selling is arranged all.
The amount that adds alkaline calcium bentonite and quicklime in the described decolouring step be 1%～6wt% of each raw materials quality summation of esterification,, wherein the mass ratio of alkaline calcium bentonite and quicklime is 1～3: 1.
Propylene glycol diacrylate or tri (propylene glycol) diacrylate product according to the preparation of the clean preparation method of described propylene glycol diacrylate or tri (propylene glycol) diacrylate.
The TPGDA reaction equation:
The DPGDA reaction equation:
A kind of clean preparation method of divalent alcohol propenoate, described divalent alcohol propenoate are neopentylglycol diacrylate (NPGDA), 1,6 hexanediol diacrylate (HDDA), and its working method comprises following steps:
(1) esterification: press NSC 6366 or 1; The whole raw materials of proportioning input of 6-pinakon: vinylformic acid: catalyzer: solvent: stopper: oxidation inhibitor=1 (mol): 2-2.5 (mol): 4-50 (g): 60-400 (g): 0.3-5 (g): 0.2-5 (g), the continuous mixed air that feeds pressurized air or air and nitrogen in still is warming up to 70-120 ℃ of beginning reflux dewatering; When reflux dewatering to anhydrous when going out; Reaction finishes, and detects acid number, and is cooled to≤40 ℃;
(2) neutralization: add sheet alkali and water and neutralize;
(3) absorption: add in the multi-silicate magnesium adsorbents adsorb and the salt that generates;
(4) dehydration, precipitation: underpressure distillation dehydration, desolventizing, and recycle-water and solvent; The water that is reclaimed without any need for handle can be directly in next time with the time use; Institute's recovered solvent can be directly uses when esterification next time;
(5) filter: press filtration filters out the salt of multi-silicate magnesium and absorption thereof;
(6) decolouring: add alkaline calcium bentonite, quicklime, decolour, take off minor amount of water, take off trace acid;
(7) filter: press filtration filters out alkaline calcium bentonite, quicklime;
(8) product index detects: outward appearance: limpid hyalomucoid, ester content>=98%, acid number≤1mgKOH, colourity≤50APHA, water ratio≤0.2%.
In the wherein said esterification preferably according to NSC 6366 or 1, the whole raw materials of proportioning input of 6-pinakon: vinylformic acid: catalyzer: solvent: stopper: oxidation inhibitor=1 (mol): 2.15-2.3 (mol): 4-50 (g): 60-400 (g): 0.5-5 (g): 0.2-5 (g); Further preferably according to NSC 6366 or 1, the whole raw materials of proportioning input of 6-pinakon: vinylformic acid: catalyzer: solvent: stopper: oxidation inhibitor=1 (mol): 2.2-2.3 (mol): 4-50 (g): 70-400 (g): 1.2-5 (g): 0.35-5 (g); Especially preferably according to NSC 6366 or 1, the whole raw materials of proportioning input of 6-pinakon: vinylformic acid: catalyzer: solvent: stopper: oxidation inhibitor=1 (mol): 2.1-2.2 (mol): 4-10 (g): 70-150 (g): 2-5 (g): 0.8-2 (g).
Described catalyzer is wherein a kind of of tosic acid, Phenylsulfonic acid, methanesulfonic, or two kinds arbitrary proportion miscellany, or three kinds arbitrary proportion miscellany.
The used solvent of described esterification is one or both in normal hexane, normal heptane, benzene, toluene, hexanaphthene, methylcyclohexane, the ethyl cyclopentane, or two or more miscellanys; In preferred toluene, hexanaphthene, the methylcyclohexane one or both, or two or more miscellanys.
The used stopper of described esterification is a MEHQ.
The used oxidation inhibitor of described esterification is the miscellany of one or both arbitrary proportions in Hypophosporous Acid, 50, the sodium hypophosphite.
Adding the sheet alkali of the 1%～3wt% account for each raw materials quality summation of described esterification and the water of 2%～10wt% in the described neutralization procedure neutralizes.
The salt that adds the multi-silicate magnesium absorption neutralization procedure generation of the 0.1%～1.0wt% that accounts for each raw materials quality summation of esterification in the described adsorption step.Described multi-silicate magnesium chemical name is a synthetic magnesium silicate.Molecular formula: 2MgO6SiO
2NH
2O (n=0-6) is the commercially available prod, like clean magnificent chemical industry ltd of East China, Wuhan chemical industry ltd, Shangyu etc. production and selling is arranged all.The amount that adds alkaline calcium bentonite and quicklime in the described decolouring step be 1%～6wt% of each raw materials quality summation of esterification,, wherein the mass ratio of alkaline calcium bentonite and quicklime is 1～3: 1.
Neopentylglycol diacrylate (NPGDA) reaction formula:
1,6 hexanediol diacrylate (HDDA) reaction formula:
Neopentylglycol diacrylate (NPGDA), 1,6 hexanediol diacrylate (HDDA) product according to the preparation of the clean preparation method of described divalent alcohol propenoate.
Beneficial effect of the present invention:
Inventive point of the present invention is mainly reflected in the improvement to the resulting propylene glycol diacrylate of esterification (DPGDA), tri (propylene glycol) diacrylate (TPGDA) work in-process post-treating method.This working method does not adopt traditional washing, delaminating process; The water that neutralization is added is reusable after underpressure distillation is reclaimed, and without sewage discharge need not invested sewage disposal device; Not having high cost of sewage disposal, is the clean preparation method of green, environmental protection, low-carbon (LC).
Key of the present invention also has been to select three kinds of effective sorbent materials---multi-silicate magnesium, alkaline calcium bentonite, quicklime.Multi-silicate magnesium sorbent material, outward appearance are a kind of spherical surface body particle or powder of white cellular structure, and it belongs to amphoteric substance, show good absorption and decoloration performance as sorbent material; Adsorber acid or alkali and potassium, sodium ion from the organic-matter chemical article, and play filtrating aid function, adsorption moisture from air.
Alkaline calcium bentonite is a kind of brand-new layer mineral material, because its special anionresin performance, has wide application development prospect, existing people's research and use that alkaline calcium bentonite decolours, depickling, come unstuck in the edible oil field.Quicklime can act synergistically with alkaline calcium bentonite, reaches better decolouring, takes off minor amount of water, takes off the sour effect of trace.
The catalyzer that the present invention uses when esterification is wherein a kind of of tosic acid, Phenylsulfonic acid, methanesulfonic, or two arbitrary proportion is mixed, or three arbitrary proportion is mixed.These several kinds of catalyzer can not cause the system color and luster to be deepened; In the presence of an amount of oxidation inhibitor; Propylene glycol diacrylate (DPGDA), tri (propylene glycol) diacrylate (TPGDA) product do not need washing, after three kinds of sorbent materials decolour, just can reach preferably colourity (≤50APHA).
Propylene glycol diacrylate (DPGDA), tri (propylene glycol) diacrylate (TPGDA) are two functional group's acrylate monomers; In its building-up process, the kind of catalyzer and consumption, the kind of stopper and consumption; These technological parameters of feed proportioning are very big to the quality and the productive rate influence of product; The present invention optimizes the processing parameter of esterification, sets about from the source, has improved the yield of propylene glycol diacrylate (DPGDA), tri (propylene glycol) diacrylate (TPGDA).
In sum; Propylene glycol diacrylate of the present invention (DPGDA), tri (propylene glycol) diacrylate (TPGDA) clean preparation method have the yield height; Economic benefit, the advantage that environmental benefit is excellent; When guaranteeing product yield and quality, the organic waste water pollution problem that fundamentally solves propylene glycol diacrylate (DPGDA), tri (propylene glycol) diacrylate (TPGDA) production process.
Propylene glycol diacrylate of the present invention (DPGDA), tri (propylene glycol) diacrylate (TPGDA) clean preparation method also can overlap and be used for neopentylglycol diacrylate (NPGDA), 1; The cleaner production of 6-hexanediyl ester divalent alcohol propenoate such as (HDDA); This method can overcome the industrial organic waste water that can produce a large amount of high COD in traditional post-treating method; Hard to manage and processing costs is high, be prone to deficiency that water body environment is polluted, the work in-process of esterification make neopentylglycol diacrylate (NPGDA), 1 through neutralization, absorption, dehydration, filtration, decolouring, filtration step; 6-hexanediyl ester (HDDA) finished product; The water that neutralization is added is reusable after underpressure distillation is reclaimed, and without sewage discharge need not invested sewage disposal device; Not having high cost of sewage disposal, is the clean preparation method of green, environmental protection, low-carbon (LC).
Embodiment
Embodiment 1:
In the 3000L reaction kettle, drop into 500 kilograms of toluene, 290 kilograms of hexanaphthenes, 545 kilograms of tripropylene glycols, 455 kilograms in vinylformic acid, 8 kilograms of MEHQs, 4 kilograms of Hypophosporous Acid, 50,55 kilograms of tosic acid; Open stirring, in still, feed pressurized air continuously, be warming up to 85-95 ℃ of beginning reflux dewatering through sparger at the bottom of the still; Esterification 9-10 hour, 95-105 ℃ of still temperature, when reflux dewatering to anhydrous when going out; Detect acid number 25～30mgKOH/g, reaction finishes, and is cooled to 40 ℃; Add 25 kilograms of sheet alkali and 60 kg of water, stirred 30 minutes; Add 6 kilograms of multi-silicate magnesium, whip attachment 30 minutes; Then more than vacuum tightness-0.098MPa, 50-95 ℃ of underpressure distillation water outlet and solvent, water that is reclaimed and solvent after layering, water without any need for handle can be directly in next time with the time use, solvent can be directly uses when esterification next time; Distillation finishes, press filtration; Add 50 kilograms of alkaline calcium bentonites and 20 jin of quicklime again, stirred 30 minutes, the press filtration that circulates again gets the tri (propylene glycol) diacrylate product until the product clear.The product index detected result: outward appearance is limpid transparent, ester content 98.8%, acid number 0.15mgKOH, colourity 40APHA, water ratio 0.06%, viscosity 14cps25 ℃.837.1 kilograms of dischargings, 851.56 kilograms of theoretical dischargings, yield is 98.30%.
Embodiment 2:
In the 3000L reaction kettle, drop into 585 kilograms of hexanaphthenes, 670 kilograms of dipropylene glycols, 800 kilograms in vinylformic acid, 6 kilograms of MEHQs, 3 kilograms of sodium hypophosphites, 30 kilograms of methanesulfonics; Open stirring, in still, feed pressurized air continuously, be warming up to 80-85 ℃ of beginning reflux dewatering through sparger at the bottom of the still; Esterification 10-12 hour, 85-92 ℃ of still temperature, when reflux dewatering to anhydrous when going out; Detect acid number 20～35mgKOH/g, reaction finishes, and is cooled to 40 ℃; Add 32 kilograms of sheet alkali and 75 kg of water, stirred 30 minutes; Add 6.5 kilograms of multi-silicate magnesium, whip attachment 30 minutes; Then more than vacuum tightness-0.098MPa, 50-95 ℃ of underpressure distillation water outlet and solvent; Water that is reclaimed and solvent after layering, water without any need for handle can be directly in next time with the time use, solvent can be directly uses when esterification next time; Distillation finishes, press filtration; Add 60 kilograms of alkaline calcium bentonites and 25 kilograms of quicklime again, stirred 30 minutes, the press filtration that circulates again gets the propylene glycol diacrylate product until the product clear.The product index detected result: outward appearance is limpid transparent, ester content 98.4%, acid number 0.16mgKOH, colourity 30APHA, water ratio 0.08%, viscosity 10cps25 ℃.1185.9 kilograms of dischargings, 1210 kilograms of theoretical dischargings, yield is 98.00%.
Embodiment 3:
In the 3000L reaction kettle, drop into 162 kilograms of methylcyclopentanes, 198 kilograms of toluene, 981 kilograms of tripropylene glycols, 754.2 kilograms in vinylformic acid, 7.2 kilograms of MEHQs, 1.8 kilograms of Hypophosporous Acid, 50,25.6 kilograms of methanesulfonics; Open stirring, in still, feed pressurized air continuously, be warming up to 85-95 ℃ of beginning reflux dewatering through sparger at the bottom of the still; Esterification 9-10 hour, 95-105 ℃ of still temperature, when reflux dewatering to anhydrous when going out; Detect acid number 25～30mgKOH/g, reaction finishes, and is cooled to 40 ℃; Add 43 kilograms of sheet alkali and 108 kg of water, stirred 30 minutes; Add 17.3 kilograms of multi-silicate magnesium, whip attachment 30 minutes; Then more than vacuum tightness-0.098MPa, 50-95 ℃ of underpressure distillation water outlet and solvent, water that is reclaimed and solvent after layering, water without any need for handle can be directly in next time with the time use, solvent can be directly uses when esterification next time; Distillation finishes, press filtration; Add 65 kilograms of alkaline calcium bentonites and 65 jin of quicklime again, stirred 30 minutes, the press filtration of advancing to circulate again gets the tri (propylene glycol) diacrylate product until the product clear.The product index detected result: outward appearance is limpid transparent, ester content 98.2%, acid number 0.17mgKOH, colourity 30APHA, water ratio 0.06%, viscosity 14cps25 ℃.1508.9 kilograms of dischargings, 1532.81 kilograms of theoretical dischargings, yield is 98.44%.
Embodiment 4:
In the 3000L reaction kettle, drop into 630 kilograms of hexanaphthenes, 570 kilograms of methylcyclohexanes, 402 kilograms of dipropylene glycols, 497 kilograms in vinylformic acid, 15 kilograms of MEHQs, 15 kilograms of Hypophosporous Acid, 50,150 kilograms of Phenylsulfonic acids; Open stirring, in still, feed pressurized air continuously, be warming up to 80-85 ℃ of beginning reflux dewatering through sparger at the bottom of the still; Esterification 10-12 hour, 85-92 ℃ of still temperature, when reflux dewatering to anhydrous when going out; Detect acid number 20～35mgKOH/g, reaction finishes, and is cooled to 40 ℃; Add 68 kilograms of sheet alkali and 205 kg of water, stirred 30 minutes; Add 6.8 kilograms of multi-silicate magnesium, whip attachment 30 minutes; Then more than vacuum tightness-0.098MPa, 50-95 ℃ of underpressure distillation water outlet and solvent; Water that is reclaimed and solvent after layering, water without any need for handle can be directly in next time with the time use, solvent can be directly uses when esterification next time; Distillation finishes, press filtration; Add 85.5 kilograms of alkaline calcium bentonites and 28.5 kilograms of quicklime again, stirred 30 minutes, the press filtration that circulates again gets the propylene glycol diacrylate product until the product clear.The product index detected result: outward appearance is limpid transparent, ester content 98.8%, acid number 0.16mgKOH, colourity 30APHA, water ratio 0.06%, viscosity 10cps25 ℃.713.9 kilograms of dischargings, 726 kilograms of theoretical dischargings, yield is 98.33%.
Comparative Examples 1:
In the 3000L reaction kettle, drop into 1000 kilograms of toluene, 545 kilograms of tripropylene glycols, 455 kilograms in vinylformic acid, 1 kilogram of MEHQ, 2 kilograms of cupric chlorides, 4 kilograms of sodium hypophosphites, 50 kilograms of tosic acid; Open stirring, in still, feed pressurized air continuously, be warming up to 98-110 ℃ of beginning reflux dewatering through sparger at the bottom of the still; Esterification 6-8 hour; 110-120 ℃ of still temperature is when reflux dewatering when going out, detects acid number 20～25mgKOH/g to anhydrous; Reaction finishes, and be cooled to 60 ℃ of washings that neutralize: the salt solution stirring, static layering, the branch that 1. add 200 kilogram 5% fall lower layer of water; 2. add 200 kilograms of saturated aqueous sodium carbonate stirrings, neutralization, static layering, branches and fall lower layer of water; 3. the salt solution stirring, static layering, the branch that add 200 kilogram 5% fall lower layer of water, and the salt solution stirring, static layering, the branch that 4. add 200 kilogram 5% fall lower layer of water; Washing finishes, and more than vacuum tightness-0.098MPa, 50-98 ℃ of underpressure distillation goes out solvent, and distillation finishes; Press filtration to product clear gets the tripropylene glycol diacrylate product.The product index detected result: outward appearance is limpid transparent, ester content 98.5%, acid number 0.15mgKOH, colourity 50APHA, water ratio 0.1%, viscosity 15cps25 ℃.804.7 kilograms of dischargings, 851.56 kilograms of theoretical dischargings, yield is 94.49%.
Comparative Examples 2:
In the 3000L reaction kettle, drop into 1100 kilograms of toluene, 535 kilograms of dipropylene glycols, 635 kilograms in vinylformic acid, 1 kilogram of MEHQ, 2 kilograms of cupric chlorides, 4 kilograms of sodium hypophosphites, 50 kilograms of tosic acid; Open stirring, in still, feed pressurized air continuously, be warming up to 98-110 ℃ of beginning reflux dewatering through sparger at the bottom of the still; Esterification 6-8 hour; 110-120 ℃ of still temperature is when reflux dewatering when going out, detects acid number 20～25mgKOH/g to anhydrous; Reaction finishes, and be cooled to 60 ℃ of washings that neutralize: the salt solution stirring, static layering, the branch that 1. add 200 kilogram 5% fall lower layer of water; 2. add 200 kilograms of saturated aqueous sodium carbonate stirrings, neutralization, static layering, branches and fall lower layer of water; 3. the salt solution stirring, static layering, the branch that add 200 kilogram 5% fall lower layer of water, and the salt solution stirring, static layering, the branch that 4. add 200 kilogram 5% fall lower layer of water; Washing finishes, and more than vacuum tightness-0.098MPa, 50-98 ℃ of underpressure distillation goes out solvent, and distillation finishes; Press filtration to product clear gets the tripropylene glycol diacrylate product.The product index detected result: outward appearance is limpid transparent, ester content 98.3%, acid number 0.15mgKOH, colourity 40APHA, water ratio 0.1%, viscosity 10cps25 ℃.906.3 kilograms of dischargings, 966.19 kilograms of theoretical dischargings, yield is 93.80%.
Embodiment 5:
In the 3000L reaction kettle, drop into 140 kilograms of toluene, 532 kilograms of hexanaphthenes, 582.5 kilograms of NSC 6366s (molecular weight 104), 847 kilograms in vinylformic acid, 14 kilograms of MEHQs, 5.6 kilograms of Hypophosporous Acid, 50,28 kilograms of methanesulfonics; Open stirring, in still, feed pressurized air continuously, be warming up to 80-85 ℃ of beginning reflux dewatering through sparger at the bottom of the still; Esterification 10-12 hour, 90-100 ℃ of still temperature, when reflux dewatering to anhydrous when going out; Detect acid number 20～35mgKOH/g, reaction finishes, and is cooled to 40 ℃; Add 64.5 kilograms of sheet alkali and 193 kg of water, stirred 30 minutes; Add 6.5 kilograms of multi-silicate magnesium, whip attachment 30 minutes; Then more than vacuum tightness-0.098MPa, 50-95 ℃ of underpressure distillation water outlet and solvent; Water that is reclaimed and solvent after layering, water without any need for handle can be directly in next time with the time use, solvent can be directly uses when esterification next time; Distillation finishes, press filtration; Add 81 kilograms of alkaline calcium bentonites and 27 kilograms of quicklime again, stirred 30 minutes, the press filtration that circulates again gets the neopentylglycol diacrylate product until the product clear.The product index detected result: outward appearance is limpid transparent, ester content 98.5%, acid number 0.15mgKOH, colourity 30APHA, water ratio 0.06%, viscosity 6cps25 ℃.1171.5 kilograms of dischargings, 1187.4 kilograms of theoretical dischargings, yield is 98.66%.
Embodiment 6:
In the 3000L reaction kettle, drop into 500 kilograms of hexanaphthenes, 1,590 kilograms of 6-pinakons (molecular weight 118), 774 kilograms in vinylformic acid, 15 kilograms of MEHQs, 5 kilograms of Hypophosporous Acid, 50,20 kilograms of methanesulfonics; Open stirring, in still, feed pressurized air continuously, be warming up to 80-85 ℃ of beginning reflux dewatering through sparger at the bottom of the still; Esterification 10-12 hour, 85-92 ℃ of still temperature, when reflux dewatering to anhydrous when going out; Detect acid number 20～35mgKOH/g, reaction finishes, and is cooled to 40 ℃; Add 64.5 kilograms of sheet alkali and 193 kg of water, stirred 30 minutes; Add 6.5 kilograms of multi-silicate magnesium, whip attachment 30 minutes; Then more than vacuum tightness-0.098MPa, 50-95 ℃ of underpressure distillation water outlet and solvent; Water that is reclaimed and solvent after layering, water without any need for handle can be directly in next time with the time use, solvent can be directly uses when esterification next time; Distillation finishes, press filtration; Add 80 kilograms of alkaline calcium bentonites and 27 kilograms of quicklime again, stirred 30 minutes, the press filtration that circulates again gets the 1,6 hexanediol diacrylate product until the product clear.The product index detected result: outward appearance is limpid transparent, ester content 98.5%, acid number 0.16mgKOH, colourity 30APHA, water ratio 0.07%, viscosity 8cps25 ℃.1113.6 kilograms of dischargings, 1130 kilograms of theoretical dischargings, yield is 98.55%.
Ester content in the foregoing description, acid number, colourity, moisture, the detection method of viscosity sees that Chinese sensitometry can radiation curing Professional Committee industry standard HB/FG02-2009.
Claims (10)
1. the clean preparation method of propylene glycol diacrylate or tri (propylene glycol) diacrylate is characterized in that this working method comprises following steps:
(1) the whole raw materials of proportioning input of esterification: press dipropylene glycol or tripropylene glycol: vinylformic acid: catalyzer: solvent: stopper: oxidation inhibitor=1 (mol): 2-2.5 (mol): 5-50 (g): 60-400 (g): 0.3-5 (g): 0.2-5 (g); In still, feed the mixed air of pressurized air or air and nitrogen continuously; Be warming up to 70-120 ℃ of beginning esterification reflux dewatering, when reflux dewatering to anhydrous when going out, reaction finishes; Detect acid number, and be cooled to≤40 ℃;
(2) neutralization: add sheet alkali and water and neutralize;
(3) absorption: add in the multi-silicate magnesium adsorbents adsorb and the salt that generates;
(4) dehydration, precipitation: underpressure distillation dehydration, desolventizing, and recycle-water and solvent;
(5) filter: press filtration filters out the salt of multi-silicate magnesium and absorption thereof;
(6) decolouring: add alkaline calcium bentonite, quicklime, decolour, take off minor amount of water, take off trace acid;
(7) filter: press filtration filters out alkaline calcium bentonite, quicklime;
(8) product index detects: outward appearance: limpid hyalomucoid, ester content>=98%, acid number≤1mgKOH, colourity≤50APHA, water ratio≤0.2%.
2. the clean preparation method of propylene glycol diacrylate according to claim 1 or tri (propylene glycol) diacrylate is characterized in that in the described esterification according to dipropylene glycol or tripropylene glycol: the whole raw materials of proportioning input of vinylformic acid: catalyzer: solvent: stopper: oxidation inhibitor=1 (mol): 2.15-2.3 (mol): 5-50 (g): 60-400 (g): 0.5-5 (g): 0.2-5 (g); Preferably according to dipropylene glycol or tripropylene glycol: vinylformic acid: catalyzer: solvent: stopper: the whole raw materials of proportioning input of oxidation inhibitor=1 (mol): 2.2-2.3 (mol): 5-50 (g): 70-400 (g): 1.2-5 (g): 0.35-5 (g).
3. the clean preparation method of propylene glycol diacrylate according to claim 1 and 2 or tri (propylene glycol) diacrylate; It is characterized in that described catalyzer is wherein a kind of of tosic acid, Phenylsulfonic acid, methanesulfonic; Or two kinds arbitrary proportion miscellany, or three kinds arbitrary proportion miscellany.
4. the clean preparation method of propylene glycol diacrylate according to claim 1 and 2 or tri (propylene glycol) diacrylate; It is characterized in that the used solvent of described esterification is one or both in normal hexane, normal heptane, benzene, toluene, hexanaphthene, methylcyclohexane, the ethyl cyclopentane, or two or more miscellanys; In preferred toluene, hexanaphthene, the methylcyclohexane one or both, or two or more miscellanys.
5. the clean preparation method of propylene glycol diacrylate according to claim 1 and 2 or tri (propylene glycol) diacrylate is characterized in that the used stopper of described esterification is a MEHQ.
6. the clean preparation method of propylene glycol diacrylate according to claim 1 and 2 or tri (propylene glycol) diacrylate is characterized in that the used oxidation inhibitor of described esterification is the miscellany of one or both arbitrary proportions in Hypophosporous Acid, 50, the sodium hypophosphite.
7. the clean preparation method of propylene glycol diacrylate according to claim 1 and 2 or tri (propylene glycol) diacrylate is characterized in that adding the sheet alkali of the 1%～3wt% that accounts for each raw materials quality summation of described esterification in the described neutralization procedure and the water of 2%～10wt% neutralizes.
8. the clean preparation method of propylene glycol diacrylate according to claim 1 and 2 or tri (propylene glycol) diacrylate is characterized in that the multi-silicate magnesium that adds the 0.1%～1.0wt% that accounts for each raw materials quality summation of esterification in the described adsorption step adsorbs the salt that neutralization procedure generates.
9. the clean preparation method of propylene glycol diacrylate according to claim 1 and 2 or tri (propylene glycol) diacrylate; The amount that it is characterized in that in the described decolouring step adding alkaline calcium bentonite and quicklime be 1%～6wt% of each raw materials quality summation of esterification,, wherein the mass ratio of alkaline calcium bentonite and quicklime is 1～3: 1.
10. according to the propylene glycol diacrylate or the tri (propylene glycol) diacrylate product of the clean preparation method of each described propylene glycol diacrylate of claim 1～10 or tri (propylene glycol) diacrylate preparation.
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