background and overview[1]
ethylene glycol ether is an ethylene glycol monoether compound. the structure of ethylene glycol monoether compounds contains ether bonds, hydroxyl groups and different alkyl groups. it is water-soluble and can dissolve organic molecules, synthetic polymers and natural polymers. it is a versatile green solvent and is widely used. as an industrial solvent, it can also be used as antifreeze, surfactant, printed circuit board adhesive, skin care additive, etc. it has broad application prospects in industry.
preparation[2]
place 46.0gmg(no3)2·6h2o, 13.1gco(no3) dissolve 2·6h2o in 100ml distilled water, then add 1.4gla(no3)3·6h 2o, obtain a salt solution, mix the obtained solution with 25% by weight of concentrated ammonia water in a co-current dropwise manner, adjust the ph of the mixed solution to 9, and react at normal pressure and 40°c 1 hour, then cooled to room temperature, aged for 20 hours, followed by conventional suction filtration, washing, drying, and roasting at 500°c for 4 hours to obtain a block catalyst, which was crushed to 40-60 mesh to obtain the required catalyst, labeled gm1.
the prepared catalyst gm1 is placed in a tubular membrane in a continuous membrane reactor, and the outside of the membrane is purged with nitrogen; under normal pressure conditions, ethanol and ethylene oxide with a molar ratio of 3:1 are carried out in the gas phase. for the ethoxylation reaction, ethanol is first vaporized in a 90°c preheater, the membrane reactor temperature is maintained at 100°c, and the gas space velocity is 1.5×103ml·g-1·h– 1, ethylene glycol ether can be prepared.
apply[3]
cn201610714512.3 discloses a preparation process of ethylene glycol ether acetate. it uses ethylene glycol ether and acetic acid as raw materials, uses a solid acid catalyst to perform a fixed-bed continuous esterification reaction, and the esterification temperature is 70-150°c. the water generated during the esterification reaction is removed by azeotropic distillation; the esterification reaction product is rectified to remove and recover unreacted ethylene glycol ether and acetic acid to obtain ethylene glycol ether acetate. when preparing solid acid catalysts, using modified nanodiatomaceous earth can reduce the occurrence of side reactions and improve the purity of crude ethylene glycol ether acetate. the preparation process provided by the invention is simple, realizes the continuous production of ethylene glycol ether acetate, and has high production efficiency; it uses a solid acid catalyst to reduce the occurrence of side reactions and will not corrode reaction equipment.
references
[1] [chinese invention] cn201611088296.2 a method for preparing ethylene glycol monoethyl ether through continuous catalytic conversion
[2] [china invention, china invention authorization] cn200710059944.6 preparation method of ethylene glycol monoethyl ether
[3] cn201610714512.3 preparation process of ethylene glycol ether acetate