CN1151157C - Method of preparing silicate ester directly from silicate - Google Patents
Method of preparing silicate ester directly from silicateInfo
- Publication number
- CN1151157C CN1151157C CNB011066679A CN01106667A CN1151157C CN 1151157 C CN1151157 C CN 1151157C CN B011066679 A CNB011066679 A CN B011066679A CN 01106667 A CN01106667 A CN 01106667A CN 1151157 C CN1151157 C CN 1151157C
- Authority
- CN
- China
- Prior art keywords
- silicate
- alcohol
- preparing
- ester directly
- thionyl chloride
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Silicon Compounds (AREA)
Abstract
The present invention discloses a method for directly preparing silicate ester from silicates. In the method, artificially synthesized or natural silicates are adopted as main raw materials, and are firstly acidified in alcohol by protonic acids to eliminate metallic ions, wherein the acidifying temperature is controlled in the range of 0 to 30 DEG C; a strong dehydrating agent is added after the silicates react sufficiently, so water generated during a reaction process is removed, and the silicate ester is obtained. The method proposed in the technical scheme has the advantages that the reaction time is greatly shortened, and the yield is increased greatly, wherein the reaction time is controlled within 5 hours, and the yield is higher than 70%. In addition, the method also has the advantages of easy industrialization production, low production cost, high yield and no pollution.
Description
The invention belongs to the preparation method of silicon ester, be specifically related to method by preparing silicate ester directly from silicate.
Silicon ester is very extensive in Application for Field such as chemical novel agent, organic synthesis, glass, potteries, and preparing various silicon ester and all be with silicon-dioxide is starting raw material.Its traditional preparation method has two kinds: the one, and with SiCl
4Method for intermediate.The 2nd, the Rochow direct synthesis technique.These two kinds of methods all will need high-intensity smelting equipment and consume lot of energy, thereby increase the cost of silicon ester product through the carbo-thermal process flow process of silicon-dioxide, have limited its development.SiO
2Take up an area of 1/4th of ball mineral wealth, raw material is easy to get, and is cheap, therefore with the cryochemistry method chemistry of silicones frontier that silicon-dioxide directly changes into silicon ester had very tempting prospect.From Rosenheim reported first in 1931 by SiO
2Directly since the cryochemistry method of synthesizing organo-silicon, especially since nearly ten years, the research in this field becomes increasingly active.
Cut till the present, bibliographical information use four kinds of different organic monomers with SiO
2Change into the method for silicon ester.These four kinds of organic monomers are pyrocatechol, aliphatic diol, organic amine, gasiform methylcarbonate respectively.
1.1 Rosenheim method
This method is that Rosenheim finds, he uses silica gel and pyrocatechol in the aqueous solution of alkalescence, at room temperature reacts, and obtains containing the hexa-coordinate compound M of crystal water
2[Si (C
6H
4O
2)
3] .nH
2O, its productive rate are 78%.
Alkali in this reaction is ammoniacal liquor (NH
3.H
2O) or KOH, M
+=NH
4 +, n=9; M
+=K
+, n=8, its reaction conditions gentleness, transformation efficiency are higher.In the environment of water is arranged, SiO
2React with pyrocatechol, what obtain is the product that contains crystal water, and A.Boudin has found that preparation does not contain the method for the six coordinate complex of crystal water: promptly in the solution of sodium methylate/methyl alcohol, and reflux, following reaction takes place in silica gel and pyrocatechol, and transformation efficiency reaches 70%:
Complexing ion [Si (C
6H
4O
2)
3]
2-Negative charge with 2 units, and central atom Si is surrounded by three bigger groups, on electrocharge effect and steric effect two aspects, going up the generation nucleophilic substitution reaction at the central atom Si of product (II) is the comparison difficulty, and therefore the silicon ester with (II) and protonic acid (as HCl) prepared in reaction pyrocatechol is the comparison difficulty.
2.2 Laine method one
Because title complex (II) is more stable, can only react with stronger nucleophilic reagent, be unfavorable for further conversion, in order to overcome this problem, Laine aliphatic diol (as ethylene glycol) and SiO
2Under highly basic, react, obtain the higher pentacoordinate complex compound M of reactive behavior
2Si
2(OCH
2CH
2O)
5, M is Na, K, Cs in this reaction, alkali also can be used alkaline-earth oxide (as MgO, CaO etc.).
In used glycol, mostly adopt the vicinal glycol.Main raw material SiO
2, can use in theory any type of, other SiO of any level
2This method weak point has: generate more water, at high temperature hydrolysis M in the reaction process
2Si
2(OCH
2CH
2O)
5Alkalescence in the reaction system is strong not enough, and this two aspects factor makes that the speed of reaction is slow and productive rate is not high.Bibliographical information, though with specific surface area greater than 600m
2g
-1Silica gel be raw material, complete reaction need be used the 1-2h time, its productive rate is 80%, uses through melting treatment, fineness is greater than 300 purpose SiO
2, complete reaction need be used 3-6h, and productive rate also surpasses 80%, but makes starting raw material with natural siliceous sand, and even be crushed to 300-400 order fineness, complete reaction need be used the above time of 200h, and this and industrial requirement have certain distance.Laine has reported M
2Si
2(OCH
2CH
2O)
5Generate silicon ester and oligopolymer thereof with protonic acid (as HCl) reaction, but the processing condition of not research the best.
1.3 Laine method two
Laine can obtain silazane with the alkali in the organic amine replacement aforesaid method, and in heat-processed, condensation reaction can take place silazane, and product is an oligopolymer.As making solvent, be heated to ethylene glycol
This method requires the boiling point of organic amine higher, at least than the boiling point height of ethylene glycol.Normally used organic amine is polyamines or amino alcohol, because this class amine has stronger alkalescence, makes reaction be easy to carry out.
1.4 gas-solid phase reaction synthetic method
The Japan scholar utilizes gas-solid phase reaction directly with SiO
2Change into methyl silicate Si (OMe)
4, this method is: under 500K-600K, the gasiform methylcarbonate by with alkaline silica gel, is obtained product methyl silicate Si (OMe)
4, the reaction times, its productive rate surpassed 90% in 1 hour.
This reaction conversion ratio is higher, and speed of response is very fast, product S i (OMe)
4With unreacted SiO
2Easily separated.But this method also has weak point: at first, it only can use the carbonic ether of lower alcohol to make raw material, this is because the carbonic diester gasification temperature of higher alcohols is too high, need high strength equipment and consume lot of energy, and the gasification temperature of the carbonic diester that has is too high, just do not decompose before reaching gasification, the mechanism of gas-solid phase reaction is RO in addition
-The Si-O-Si key on attack silica gel surface, and the RO of higher alcohols
-Activity is lower.
More than be up to now bibliographical information directly by SiO
2Four kinds of methods of preparation silicon ester.In addition, Kenney and Goodwin directly synthesize tetraethoxy with silicate.Silicate is earlier with protonic acid (as HCl) acidifying, mix azeotropic in the solvent at toluene and alcoholic acid then, slowly boil off the water that produces in the reaction process, but since this method get rid of water that reaction generates inadequately rapidly, thorough inadequately, so final product is the miscellany of the end polymers of tetraethoxy, triethoxy silanol and tetraethyl silicate.And productive rate is the end of than, generally between 30%-50%.
The object of the present invention is to provide a kind of method, to overcome the deficiency of above-mentioned each method by preparing silicate ester directly from silicate.
By the method for preparing silicate ester directly from silicate, it is to be main raw material with synthetic or natural silicate, at first uses the protonic acid acidifying in alcohol, removes metal ion, and souring temperature is controlled at 0 ℃~30 ℃; Fully react the back at it and add strong dewatering agent, remove the water that generates in the reaction process, obtain silicon ester.
Silicate is selected water glass, Calucium Silicate powder, monticellite, willemite stone, calcium magnesium feldspar or rankinite.Dewatering agent is selected thionyl chloride, diacetyl oxide, acetate chlorine or molecular sieve.Alcohol is selected methyl alcohol, ethanol, propyl alcohol, Virahol or butanols, and protonic acid is selected thionyl chloride, hydrochloric acid or sulfuric acid.
The method that this technical scheme proposes has not only shortened the reaction times greatly, and the reaction times was controlled in 5 hours, and had improved productive rate by a relatively large margin, and productive rate is more than 70%.This method is easier to suitability for industrialized production, and production cost is low, and the productive rate height is pollution-free.
Embodiment 1:
Prepare tetraethoxy by wollastonite (Calucium Silicate powder): silicate is selected Calucium Silicate powder, and alcohol is selected ethanol, and protonic acid is selected thionyl chloride, dewatering agent selection thionyl chloride, and the mass ratio of four kinds of raw materials is 1: 25~56: 2: 1.5~3.
To capacity is that to add the wollastonite, the 800ml that contain pure Calucium Silicate powder 25 grams in the three-necked flask of 1L heavily be 630 gram ethanol and 7.8 gram water, ice bath, and slowly dripping 32ml under the mechanical stirring heavily is 53 gram thionyl chloride SOCl
2, dropwise the back and stir 4h, filter, keep filtrate, add hot filtrate then to boiling, the limit steams the solvent limit, and to drip 65ml lentamente heavily be 108 gram thionyl chloride SOCl
2, last underpressure distillation obtains product 31.2 grams, and productive rate is 70%.
Detected result: infrared spectra IR:V
Max/ cm
-1: 1044 (Si-O), 2980,2800,1500 (CH
3), 2930,1400,800 (CH
2-); Nuclear magnetic resonance spectrum
1HMR δ: 1.12-1.5 (12H ,-CH
3), 3.87-4 (8H ,-CH
2-).
Embodiment 2:
Prepare tetraethoxy by bubble flower alkali.Silicate is selected water glass, and alcohol is selected ethanol, and protonic acid is selected hydrochloric acid, and dewatering agent is selected thionyl chloride, and the mass ratio of four kinds of raw materials is 1: 10~20: 1: 3~5.
To capacity is to add the bubble flower alkali that contains pure water glass 36 grams, the ethanol of 515 grams, ice bath in the three-necked flask of 1L, under the mechanical stirring, with 36 gram hcl acidifyings, reaction 5h after-filtration, add then hot filtrate to the boiling, the limit steam the solvent limit drip lentamente 85ml heavily be 141 the gram SOCl
2, last underpressure distillation obtains product 29.6 grams, and productive rate is 81%.
Detected result:
Infrared spectra IR:V
Max/ cm
-1: 1050 (Si-O), 2950,2800,1500 (CH
3), 2900,1400,750 (CH
2-); Nuclear magnetic resonance spectrum
1HMR δ: 1.22
∽1.56 (12H ,-CH
3), 3.63,4.5 (8H ,-CH
2-).
Claims (6)
1, a kind of method by preparing silicate ester directly from silicate is characterized in that: this method is a main raw material with synthetic or natural silicate, at first uses the protonic acid acidifying in alcohol, removes metal ion, and souring temperature is controlled at 0 ℃~3 ℃; Fully react the back at it and add strong dewatering agent, remove the water that generates in the reaction process, obtain silicon ester.
2, according to claim 1 by the method for preparing silicate ester directly from silicate, it is characterized in that: silicate can be selected water glass, Calucium Silicate powder, monticellite, willemite stone, calcium magnesium feldspar or rankinite.
3, according to claim 1 by the method for preparing silicate ester directly from silicate, it is characterized in that: dewatering agent can be selected thionyl chloride, diacetyl oxide, acetate chlorine or molecular sieve.
4, according to claim 1 by the method for preparing silicate ester directly from silicate, it is characterized in that: alcohol can be selected methyl alcohol, ethanol, propyl alcohol, Virahol or butanols.
5, according to claim 1 by the method for preparing silicate ester directly from silicate, it is characterized in that: during the preparation tetraethyl silicate, silicate is selected water glass, alcohol is selected ethanol, protonic acid is selected thionyl chloride, dewatering agent is selected thionyl chloride, and the mass ratio of four kinds of raw materials is 1: 25~56: 2: 1.5~3.
6, according to claim 1 by the method for preparing silicate ester directly from silicate, it is characterized in that: during the preparation tetraethyl silicate, silicate is selected Calucium Silicate powder, alcohol is selected ethanol, protonic acid is selected hydrochloric acid, and dewatering agent is selected thionyl chloride, and the mass ratio of four kinds of raw materials is 1: 10~20: 1: 3~5.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB011066679A CN1151157C (en) | 2001-04-28 | 2001-04-28 | Method of preparing silicate ester directly from silicate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB011066679A CN1151157C (en) | 2001-04-28 | 2001-04-28 | Method of preparing silicate ester directly from silicate |
Publications (2)
Publication Number | Publication Date |
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CN1322726A CN1322726A (en) | 2001-11-21 |
CN1151157C true CN1151157C (en) | 2004-05-26 |
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ID=4655651
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CNB011066679A Expired - Fee Related CN1151157C (en) | 2001-04-28 | 2001-04-28 | Method of preparing silicate ester directly from silicate |
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2001
- 2001-04-28 CN CNB011066679A patent/CN1151157C/en not_active Expired - Fee Related
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