Method for removing water from ethyl acetate and butanone mixed solvent

Abstract

The invention discloses a method for removing water from an ethyl acetate and butanone mixed solvent. The method comprises a step of adding a drying agent into a water-containing mixture of ethyl acetate and butanone to remove water, wherein the drying agent is solid calcium oxide in an amount which is 12 to 25 percent of the weight of the water-containing mixture of the ethyl acetate and the butanone. A small amount of water is removed from the water-containing mixture of the ethyl acetate and the butanone by a drying method; the method is easy to operate, time-saving and labor-saving; the drying agent is the calcium oxide and has low price; the processing process is mild without danger; and the posttreatment process is simple, namely a kettle can be directly washed with deionized water and can also be properly washed with diluted hydrochloric acid. By the method, production cost is greatly reduced; the treatment effect is good; the water content of the treated mixed solvent can be reduced to below 0.05 percent; the effect is remarkable; and the actual application requirement is met.

Description

technical field [0001] The invention relates to a method for accurately removing water from a solvent, in particular to a method for accurately removing water from a mixture of ethyl acetate and butanone containing a small amount of water. Background technique [0002] The mixed solvent of ethyl acetate and methyl ethyl ketone generally acts as a reaction medium in organic synthesis, so the dosage is generally large. The price of ethyl acetate per ton is above 7,000 RMB, and the price of butanone per ton is about 12,000 RMB. After the organic synthesis reaction, more than 80% of each ton of ethyl acetate can be recovered, and more than 50% of each ton of butanone can be recovered. Quite a waste of raw material if not recycled. [0003] In some organic synthesis, a mixed solvent of ethyl acetate and methyl ethyl ketone with anhydrous or very little water content is often required. Treatment, so that the moisture contained in the solvent containing traces of water increases....

AI Technical Summary

Problems solved by technology

The pervaporation membrane can realize the water removal effect through the difference in the dissolution and diffusion rate of each component in the membrane, but firstly, it needs to introduce equipment. For the recovery of solvents, large-scale production is not required, and the cost of introducing equipment is too high; for hydrogenation The post-treatment of calcium and sodium hydride may cause an explosion when it meets water, which is quite dangerous; although sodium sulfate can also remove water, it is used in a large amount, and sodium sulfate is easy to agglomerate when it meets water, which is time-consuming and labor-intensive when cleaning equipment ; Anhydrous copper sulfate must be used in a large amount to remove water, and the economic effect is not good; molecular sieves are generally used for removing water from gases, not suitable for removing water in solvents

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