Clean production method for propylene glycol monomethyl ether acetate
A technology of propylene glycol methyl ether propionate and propylene glycol methyl ether, which is applied in the field of clean production of propylene glycol methyl ether propionate, and can solve the problems of human health hazards, high toxicity, unsatisfactory azeotropic dehydrating agent and the like
Active Publication Date: 2006-08-16
JIANGSU YIDA CHEM +1
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Problems solved by technology
[0008] Benzene has a good dehydration effect, but it is highly toxic and harmful to human health; for toluene, xylene, hexane, and cyclohexane, no matter how the conditions of the reaction process are adjusted, about 10% of the reactant propylene glycol methyl ether will be entrained (see CN1092060A), they are undesirable azeotropic dehydrating agents
Method used
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Effect test
example 1
[0032] Add 180g of PM, 132g of PA, 0.3g of p-toluenesulfonic acid, and 47g of butyl acetate into a 500ml three-neck flask with a water separator and a back distillation condenser ￠20×600 packed tower, and control the reaction temperature at 130-145°C. Keep the reactant in a boiling state all the time, react for 4h, and analyze the reaction product by gas chromatography. 2.6%, PMP 56.3%.
example 2
[0034] Component
example 3
[0036] Component
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Abstract
The invention relates to a cleaning method for preparing propylene glycol monomethyl ether propionate. The product can be made by direct esterification of propylene glycol methyl ether and propionic acid used as raw materials with acid catalyst and azeotropic dehydrant, characterized by acetate and propionate used as azeotropic dehydrant.
Description
Technical field: [0001] The invention relates to a clean production method of propylene glycol methyl ether propionate. Propylene Glycol Methyl Ether Propionate has excellent solubility and relatively high oily property. In addition to being used as a paint thinner, it can also be used as a raw material for synthetic resins, a solvent for inks, an electronic cleaning agent for replacing trichloroethane, and cosmetics Use solvents. It is an ideal substitute for glycol ether acetate. Background technique: [0002] Propylene glycol methyl ether propionate (PMP) is mainly composed of propionic acid-1-methoxy-2-propyl ester, which is based on 1-methoxy-2-interol (containing a small amount of isomer 2-methoxy -1-propanol; hereinafter referred to as propylene glycol methyl ether, PM) and propionic acid (hereinafter referred to as PA) are raw materials, under the action of acid catalyst and azeotropic dehydrating agent, carry out direct esterification reaction: [0003] <chem...
Claims
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IPC IPC(8): C07C69/22C07C67/08
Inventor 朱新宝刘准
Owner JIANGSU YIDA CHEM
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