CN1241888C - Synthetic method for propylend glycol dimethyl ether - Google Patents
Synthetic method for propylend glycol dimethyl ether Download PDFInfo
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- CN1241888C CN1241888C CN 200310112773 CN200310112773A CN1241888C CN 1241888 C CN1241888 C CN 1241888C CN 200310112773 CN200310112773 CN 200310112773 CN 200310112773 A CN200310112773 A CN 200310112773A CN 1241888 C CN1241888 C CN 1241888C
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Abstract
The present invention relates to a synthetic method of propylend glycol dimethyl ether, which is characterized in that propylene glycol methyl ether, alkali and an alkylating agent are used as raw materials and react at the reaction temperature of 40 to 90 DEG C to obtain the propylene glycol dimethyl ether, wherein the alkali can be sodium hydroxide, sodium methylate, potassium hydroxide or potassium methoxide, and the alkylating agent can be methyl chloride, dimethyl sulphate or dimethyl carbonate. When the alkylating agent is methyl chloride or dimethyl sulphate, the charge ratio of the raw materials of propylene glycol methyl ether to alkali to alkylating agent is 1:1.0 to 2.0:1.0 to 1.3(molar ratio) in the reaction; when the alkylating agent is dimethyl carbonate, the charge ratio of the raw materials of propylene glycol methyl ether to alkali to alkylating agent is 1:1.0 to 2.0:0.5 to 0.65(molar ratio) in the reaction. The synthetic method has the advantages of mild reaction condition, high production safety, high selectivity of the reaction product, fewer side reactions, high product purity, simple technological process and easy industrialization.
Description
The technical field is as follows:
the invention relates to a synthesis method of propylene glycol dimethyl ether, belonging to the technical field of organic chemical industry.
Secondly, background art:
the chemical name of the propylene glycol dimethyl ether is 1, 2-dimethoxypropane, and the structural formula is as follows: CH (CH)3OCH2CH(CH3)OCH3. The propylene glycol dimethyl ether is used as a novel low-toxicity aprotic polar solvent which is easy to solvate cationic substances, and can be used in the chemical process fields of electrochemistry, polar organic reaction, anion polymerization, coordination ion polymerization and the like; the method is used in the physical processing fields of extraction, stabilization and the like; can also be used for industrial products such as lubricant, fabric, medicine, pesticide and the like; but also can be widely applied to cleaning agents, extracting agents, stabilizing agents, cosolvent, organic synthesis reaction solvents, additives, wetting solvents and the like.
The research on the synthesis of propylene glycol dimethyl ether is less reported. According to theclassical etherification synthesis method, the following three methods are mainly summarized for the synthesis of the well-known propylene glycol dimethyl ether: 1. propylene glycol methyl ether and methanol are subjected to intermolecular dehydration, and the same intermolecular dehydration is easy to occur in the reaction process, so that a series of by-product ethers are generated, and the purity of the product is influenced. 2. The ring opening reaction of propylene oxide and methyl ether is carried out under the condition of pressurization, and the polymerization of propylene oxide is easy to occur when an epoxy bond is opened, so that a series of higher molecular homologous compound compounds are formed. 3. Williamson (Williamson) etherification synthesis. The traditional Williamson etherification synthesis method is to firstly prepare propylene glycol methyl ether and metallic sodium (or NaNH)2) The reaction is carried out to generate propylene glycol methyl ether sodium, and then the propylene glycol methyl ether sodium reacts with methyl halide to generate propylene glycol dimethyl ether:
Thirdly, the invention content:
the invention aims to provide a method for synthesizing propylene glycol dimethyl ether with high safety, high conversion rate and less byproducts.
The technical content of the invention is a method for synthesizing propylene glycol dimethyl ether, which is characterized in that propylene glycol methyl ether, alkali and alkylating agent are used as raw materials, polyalkylene dialkyl ether is used as a catalyst, and the reaction is carried out at the reaction temperature of 40-90 ℃ to prepare the propylene glycol dimethyl ether product, wherein the alkali is sodium hydroxide, sodium methoxide, potassium hydroxide or potassium methoxide, and the alkylating agent is methyl chloride, dimethyl sulfate or dimethyl carbonate; wherein when the alkylating agent is methyl chloride or dimethyl sulfate, the feeding proportion of the raw materials in the reaction is 1: 1.0-2.0: 1.0-1.3 (molar ratio) of propylene glycol methyl ether, alkali and alkylating agent; when the alkylating agent is dimethyl carbonate, the feeding proportion of the raw materials in the reaction is that propylene glycol methyl ether, alkali and the alkylating agent are 1: 1.0-2.0: 0.5-0.65 (molar ratio); the structural formula of the catalyst polyalkylene dialkyl ether is R1O[CH2CH(R2)O]nCH3Wherein R is1＝C1～4Alkyl radical, R2＝H、CH3N is 4-10; the dosage of the catalyst is 20-100% of propylene glycol methyl ether by mass. The invention is suitable for reaction under normal pressure because of low requirements on equipment and less side reactions under normal pressure.
The alkali used in the present invention is preferably sodium hydroxide because sodium hydroxide is relatively inexpensive.
The alkylating agent used in the invention is high in toxicity of dimethyl sulfate and high in price of dimethyl carbonate, and is best in chloromethane.
A typical reaction is as follows:
The proper feeding ratio of propylene glycol methyl ether, sodium hydroxide and chloromethane is 1: 1.2-1.6: 1.05-1.15 (molar ratio), and the optimal feeding ratio is 1: 1.3: 1.1 (molar ratio).
The reaction temperature suitable for preparing the propylene glycol dimethyl ether is 50-80 ℃; the optimal reaction temperature is 60-70 ℃.
The invention adopts sodium hydroxide to replace metal sodium; because solid sodium hydroxide or sodium hydroxide solution is not dissolved in an organic phase, the conversion rate of propylene glycol methyl ether is relatively reduced, and a phase transfer catalyst is gradually introduced in the chemical synthesis process. The catalyst used in the reaction can make the reaction have better effect. The mechanism of the phase transfer catalytic reaction is as follows: in the organic reaction of a multiphase system, the reaction among multiple phases can be transferred into an organic phase to be carried out, so that the reaction is accelerated, and the reaction process comprises the following steps:
Q+Y-+X-＝＝＝Q+X-+Y-aqueous phase
-x-c interface
Q+Y-+RX→Q+X-+ RY organic phase
In the formula: QX- -surfactant, RX- -reactant, RY- -reaction product.
The catalyst polyalkylene dialkyl ether adopted by the invention is an aprotic polar solvent, has a solubilizing effect on sodium hydroxide, and simultaneously plays a role of a diluent, so that solid and gas materials are dispersed and dissolved in a solution in the reaction process, the contact between reactants is increased, and the effect of improving the reaction conversion rate is achieved.
The catalyst polyalkylene dialkyl ether can be purchased from the market or prepared by adopting the known preparation technology, and is prepared by reacting lower alcohol with ethylene oxide and propylene oxide to prepare polyalkylene monoalkyl ether and then carrying out etherification and end capping reaction with alkali and chloromethane.
The proper dosage of the polyalkylene dialkyl ether catalyst is 30-70% (mass percent) of propylene glycol methyl ether, and the optimal dosage of the catalyst is 40-60% (mass percent) of propylene glycol methyl ether.
The propylene glycol dimethyl ether prepared by the invention is subjected to solid-liquid separation such as filtration or extraction to remove solid byproduct salt, and then is subjected to rectification and dehydration refining to prepare a high-purity propylene glycol dimethyl ether product. Rectifying in a rectifying tower with more than 20 tower plates to obtain propylene glycol dimethyl ether product with purity of more than 99.8% by gas chromatographic analysis.
The polyalkylene dialkyl ether catalyst and the product propylene glycol dimethyl ether used in the invention are separated by rectification in a rectifying still and can be recycled.
The invention has the advantages that: the reaction condition is mild, and the production safetyis good; the reaction product has high selectivity, less side reaction and high product purity; the process flow is simple and easy to realize industrialization.
Fourthly, the specific embodiment:
the invention is further described below by way of examples, but without being limited thereto.
The raw material used by the invention is propylene glycol monomethyl ether with industrial grade, the purity is more than 99 percent, and the Jiangyin Yida chemical industry company is produced; sodium hydroxide is of industrial grade, the purity is more than 96 percent, and the sodium hydroxide is produced in a combined fertilizer chemical plant; sodium methoxide is of industrial grade, the purity is more than 96 percent, and the sodium methoxide is imported from Japan; the monochloromethane is of industrial grade, the purity is more than 99.5 percent, and the product is produced by Zhejiang sublimation group chemical company Limited; dimethyl sulfate is industrial grade, the purity is more than 99 percent, and the dimethyl sulfate is produced by the chemical industry Limited company in the market of tin-free poplar; dimethyl carbonate is industrial grade, the purity is more than 99 percent, and the dimethyl carbonate is produced in a chemical plant of Tangshan and Chaoyang; the polyalkylene dialkyl ether catalysts are prepared by known preparative techniques.
Example 1
Adding 225g of propylene glycol monomethyl ether and 130g of sodium hydroxide into a 1000ml four-neck flask provided with a mechanical stirrer with a mechanical seal, a reflux condenser and a thermometer respectively, starting the stirrer, heating to 60 ℃ for reaction for 1h, introducing 139g of methyl chloride gas for etherification reaction, controlling the reaction temperature to be 60-70 ℃, completing the addition within 6h, stopping introducing chloromethane, continuing the heat preservation reaction for 1h, and finishing the reaction. Cooling to room temperature, filtering to obtain 237g of crude product, and analyzing the content of propylene glycol dimethyl ether by gas chromatography to obtain 81.3 percent.
Example 2
Adding 225g of propylene glycol monomethyl ether and 145g of sodium methoxide into a 1000ml four-neck flask provided with a mechanical stirrer with a mechanical seal, a reflux condenser and a thermometer respectively, starting the stirrer, heating to 50 ℃ for reaction for 1h, introducing 139g of methyl chloride gas for etherification reaction, controlling the reaction temperature to be 50-60 ℃, completing the addition within 6h, stopping introducing methyl chloride, continuing the heat preservation reaction for 1h, and finishing the reaction. Cooling to room temperature, filtering to obtain 301g of crude product, and analyzing the content of propylene glycol dimethyl ether by gas chromatography to obtain 62.7 percent.
Example 3
Adding 225g of propylene glycol monomethyl ether and 150g of sodium hydroxide into a 1000ml four-neck flask provided with a mechanical stirrer with a mechanical seal, a reflux condenser and a thermometer respectively, starting the stirrer, heating to 70 ℃ for reaction for 1h, dropwise adding 315g of dimethyl sulfate for etherification reaction, controlling the reaction temperature to be 70-80 ℃, completing the addition within 6h, stopping dropwise adding the dimethyl sulfate, continuing the heat preservation reaction for 1h, and finishing the reaction. Cooling to room temperature, filtering to obtain crude product 227g, and analyzing the content of propylene glycol dimethyl ether by gas chromatography for 76.5%.
Example 4
Adding 225g ofpropylene glycol monomethyl ether and 130g of sodium hydroxide into a 1000ml four-neck flask provided with a mechanical stirrer with mechanical seal, a reflux condenser and a thermometer respectively, starting the stirrer, heating to 50 ℃ for reaction for 1h, dropwise adding 118g of dimethyl carbonate for etherification reaction, controlling the reaction temperature to be 50-60 ℃, completing the addition within 6h, stopping dropwise adding the dimethyl carbonate, continuing the heat preservation reaction for 1h, and finishing the reaction. Cooling to room temperature, filtering to obtain crude product 231g, and analyzing the content of propylene glycol dimethyl ether by gas chromatography to obtain 77.5 percent.
Example 5
Adding 225g of propylene glycol monomethyl ether, 200g of propylene glycol dimethyl ether (with the purity of 99.8%) and 150g of sodium hydroxide into a 1000ml four-neck flask provided with a mechanical stirrer with a mechanical seal, a reflux condenser and a thermometer respectively, starting the stirrer, heating to 60 ℃, reacting for 1h, introducing 155g of methyl chloride gas for etherification reaction, controlling the reaction temperature to be 60-70 ℃, completing the addition within 6h, stopping introducing chloromethane, continuing to perform heat preservation reaction for 1h, and finishing the reaction. Cooling to room temperature, filtering to obtain 427g of crude product, and analyzing the content of propylene glycol dimethyl ether by gas chromatography to obtain 81.1% of propylene glycol monomethyl ether.
Example 7
Adding 225g of propylene glycol monomethyl ether, 150g of sodium hydroxide and 225g of polyalkylene dialkyl ether into a 1000ml four-neck flask provided with a mechanical stirrer with a mechanical seal, a reflux condenser and a thermometer respectively, starting the stirrer, heating to 70 ℃ for reaction for 1h, introducing 150g of methyl chloride gas for etherification reaction, controlling the reaction temperature to be 70-80 ℃, finishing the addition within 6h, continuing the heat preservation reaction for 1h after stopping introducing the methyl chloride, and finishing the reaction. Cooling to room temperature, filtering to obtain 478g of crude product, distilling to obtain 257g of propylene glycol dimethyl ether crude product, wherein the content of the propylene glycol dimethyl ether is 91.0 percent, and recovering 221g of the catalyst.
Example 8
Adding 225g of propylene glycol monomethyl ether, 130g of sodium hydroxide and 113g of polyalkylene glycol dialkyl ether into a 1000ml four-neck flask provided with a mechanical stirrer with a mechanical seal, a reflux condenser and a thermometer respectively, starting the stirrer, heating to 60 ℃ for reaction for 1h, introducing 139g of methyl chloride gas for etherification reaction, controlling the reaction temperature to be 60-70 ℃, finishing the addition within 6h, continuing the heat preservation reaction for 1h after stopping introducing the chloromethane, and finishing the reaction. Cooling to room temperature, filtering to obtain 310g of crude product, distilling to obtain 255g of crude product of propylene glycol dimethyl ether with the content of 95.0 percent of propylene glycol dimethyl ether, and recovering 111g of catalyst.
Claims (3)
1. A method for synthesizing propylene glycol dimethyl ether,the method is characterized in that propylene glycol dimethyl ether, alkali and an alkylating agent are used as raw materials, polyalkylene dialkyl ether is used as a catalyst, and the reaction is carried out at the reaction temperature of 40-90 ℃ to prepare a propylene glycol dimethyl ether product, wherein the alkali is sodium hydroxide, sodium methoxide, potassium hydroxide or potassium methoxide, and the alkylating agent is methyl chloride, dimethyl sulfate or dimethyl carbonate; wherein when the alkylating agent is methyl chloride or dimethyl sulfate, the feeding proportion of the raw materials in the reaction is that the mol ratio of propylene glycol methyl ether, alkali and the alkylating agent is 1: 1.0-2.0: 1.0-1.3; when the alkylating agent is dimethyl carbonate, the feeding proportion of the raw materials in the reaction is that the mol ratio of propylene glycol methyl ether, alkali and the alkylating agent is 1: 1.0-2.0: 0.5-0.65; the structural formula of the catalyst polyalkylene dialkyl ether is R1O[CH2CH(R2)O]nCH3Wherein R is1＝C1～4Alkyl radical, R2＝H、CH3N is 4-10; the dosage of the catalyst is 20-100% of propylene glycol methyl ether by mass.
2. The process for synthesizing propylene glycol dimethyl ether according to claim 1, wherein the base is sodium hydroxide, and the alkylating agent is methyl chloride; the feeding ratio of propylene glycol methyl ether, sodium hydroxide and chloromethane is 1: 1.2-1.6: 1.05-1.15 mol ratio, and the reaction temperature is 50-80 ℃; the dosage of the catalyst is 30-70% of propylene glycol methyl ether by mass.
3. The synthesis method of propylene glycol dimethyl ether according to claim 2, characterized in that the feeding ratio of propylene glycol methyl ether, sodium hydroxide and methyl chloride is 1: 1.3: 1.1 mol ratio, and the reaction temperature is 60-70 ℃; the dosage of the catalyst is 40-60% of propylene glycol methyl ether by mass.
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| CN 200310112773 CN1241888C (en) | 2003-12-26 | 2003-12-26 | Synthetic method for propylend glycol dimethyl ether |
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| CN 200310112773 CN1241888C (en) | 2003-12-26 | 2003-12-26 | Synthetic method for propylend glycol dimethyl ether |
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| CN1241888C true CN1241888C (en) | 2006-02-15 |
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| BR112016014276A2 (en) * | 2013-12-20 | 2017-08-08 | Archer Daniels Midland Co | METHOD OF ALKYLATION OF AN ANHYDRO-SUGAR COMPOUND; ETHER COMPOUND; ISOHEXIDE ALKYLATED COMPOUND; AND CARBONATE COMPOUND |
| CN103641694B (en) * | 2013-12-20 | 2015-08-12 | 安徽立兴化工有限公司 | A kind of preparation method of dipropylene glycol dipropyl ether |
| CN110452102A (en) * | 2019-08-30 | 2019-11-15 | 苏州汉德创宏生化科技有限公司 | A kind of synthetic method of 3- methoxyl group -3- methyl butyne |
| CN112246279B (en) * | 2020-07-09 | 2021-10-01 | 上海芾楠企业服务中心 | Catalyst and preparation method of ethylene glycol dimethyl ether |
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