Method for catalyzing and synthesizing ethyl acetate by sulfanilic acid
A technology of p-aminobenzenesulfonic acid and ethyl acetate, which is applied in the field of catalytic synthesis of ethyl acetate by using p-aminobenzenesulfonic acid, can solve the problems of difficult treatment of reaction waste liquid, high production cost, and many side reactions, and achieve catalytic activity Strong, reduce waste discharge, improve the effect of selectivity
Active Publication Date: 2019-05-10
YELLOW RIVER CONSERVANCY TECHN INST
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Problems solved by technology
In recent years, with the rapid development of the economy, the demand for ethyl acetate has been increasing at home and abroad. However, the traditional process of directly esterifying ethyl acetate with concentrated sulfuric acid as a catalyst has serious equipment corrosion, many side reactions, and reaction waste. Disadvantages such as difficult to handle and high production cost
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Embodiment 1
[0011] The method of utilizing p-aminobenzenesulfonic acid to catalyze the synthesis of ethyl acetate of the present embodiment, the steps are as follows:
[0012] A thermometer and a reflux condenser are installed on the 100mL three-necked round-bottomed flask, and a certain amount of acetic acid, 95% ethanol, and p-aminobenzenesulfonic acid are added as catalyst and zeolite, wherein the ratio of the amount of ethanol to acetic acid is 2.5:1. The amount of aminobenzenesulfonic acid is 6% of the total mass of ethanol and acetic acid. It is fixed in a water bath of an ultrasonic device at a certain temperature. The ultrasonic power is 500W. Heating to reflux for 90min, cooling to room temperature; sequentially washing with saturated sodium carbonate, saturated sodium chloride, saturated calcium chloride and other solutions, separating the ester layer and drying with anhydrous magnesium sulfate, changing to a distillation device, collecting fractions at 74-79°C , the resulting p...
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Abstract
The invention discloses a method for catalyzing and synthesizing ethyl acetate by sulfanilic acid. According to the method, the sulfanilic acid serves as a catalyst and replaces concentrated sulfuricacid, so that esterification reaction acetic acid and ethyl alcohol is catalyzed, the ethyl acetate is synthesized, the influence of the weight ratio of the ethyl alcohol to the acetic acid, catalystdosage, reaction time and reaction temperature on the yield of a product is discussed, and an optimum synthesis condition is determined by an orthogonal experiment. Research results show that ultrasonic power is 500 W, the weight ratio of the ethyl alcohol to the acetic acid is 2.5:1, catalyst dosage is 6%, reaction time is 90 minutes, and the reaction temperature is 90 DEG C. The yield of the purified ethyl acetate reaches 92.4%, and the purity of the ethyl acetate is good by analyzing refractive indexes of the ethyl acetate and infrared spectrums.
Description
technical field [0001] The invention belongs to the technical field of ethyl acetate synthesis, and in particular relates to a method for catalytically synthesizing ethyl acetate by using p-aminobenzenesulfonic acid. Background technique [0002] Ethyl acetate is an important chemical raw material and a good organic solvent. It can be used as an adhesive, an extraction agent for medicines and organic acids, and a raw material for fruity flavors. In recent years, with the rapid development of the economy, the demand for ethyl acetate has been increasing at home and abroad. However, the traditional process of directly esterifying ethyl acetate with concentrated sulfuric acid as a catalyst has serious equipment corrosion, many side reactions, and reaction waste. Difficult to handle, high production costs and other disadvantages. For this reason, the research and development of new catalysts for the synthesis of ethyl acetate has received people's attention. Contents of the i...
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IPC IPC(8): C07C67/08C07C69/14B01J31/02
Inventor 李建壮王崇景楚红英许华杜凌楠庞宏建王哲嵘李若琛
Owner YELLOW RIVER CONSERVANCY TECHN INST