Purification process of ethyl formate
AssigneeTaicang Hushi Reagent Co., Ltd.
InventorsMing Lv, Xin Sun, Yongqi Wang, Jianjiang Zhi
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Abstract
Provided is a purification process for ethyl formate, belonging to the field of separation and purification. The purification process includes: preparing a molecular sieve doped with aluminum on a surface; modifying the surface of the molecular sieve to obtain a modified molecular sieve, and then combining the modified molecular sieve with porous polymer to obtain a composite, and supporting the composite on a porous matrix to prepare a separation membrane, thereby obtaining a purification material for separation and purification. The process is low in energy consumption and high in separation factor, and a separation material is reusable, and low in use cost.
Claims9
A purification material for ethyl formate, wherein the purification material for ethyl formate is prepared by the following procedure:
- preparing a molecular sieve doped with aluminum on a surface, and carrying out surface grafting modification of the molecular sieve with γ-methacryloxypropyltrimethoxysilane to obtain a modified molecular sieve;
- placing polyvinylidene fluoride in dimethyl sulfoxide and mixing uniformly, and then adding polyvinyl alcohol;
- in a nitrogen atmosphere, heating a system until polyvinyl alcohol is completely dissolved, and ultrasonically mixing for 3 to 5 h;
- then adding the modified molecular sieve, ultrasonicating until the system is homogeneous, adding azodiisobutyronitrile, and mixing thoroughly for 0.5 h to 1 h to obtain homogeneous solution;
- and
- casting the homogeneous solution onto a matrix to form a film, allowing infiltration by standing for 1 h to 2 h, then freezing to obtain a frozen membrane material;
- fully replacing dimethyl sulfoxide in the frozen membrane material with water, and drying a wet membrane material after completion of displacement with hot air at 70° C. to 85° C.;
- and after drying, thoroughly washing the membrane material with hot water, and drying the washed membrane material to obtain a purification material.
The purification material for ethyl formate according to 1, wherein the preparation of the molecular sieve comprises the following steps:
- a. placing tetrapropylammonium hydroxide in a sodium hydroxide solution and mixing uniformly, then adding tetraethyl orthosilicate and mixing uniformly, and stirring for 6 h to 10 h;
- after carrying out crystallization for 48 h to 72 h, thoroughly washing a product, and drying the washed product to obtain a precursor;
- b. dispersing the precursor in water, adding the sodium hydroxide solution and mixing thoroughly, adding sodium metaaluminate and mixing uniformly, and then carrying out crystallization for 10 h to 24 h;
- thoroughly washing a product, drying, and then calcining the product at 500° C. to 600° C. for 5 h to 8 h to obtain the molecular sieve.
Dependencies are inferred from the claim text.