Method for preparing (methyl) butyl acrylate

Abstract

The invention discloses a making method of (methyl) butyl acrylate, which comprises the following steps: adding (methyl) acrylic acid and butanol into reactor; stirring in the stirrer; supplementing; heating; controlling the reacting temperature between 90 and 95 deg.c and vacuum degree under 0.06-0.04Mpa; proceeding homogeneous phase esterifying reaction; producing (methyl) butyl acrylate and water; azeotroping; rectifying; draining water through condenser, quantizer and water-phase receiver; returning organic phase into rectifying tower top; improving transmitting rate over 98.5% and selectivity over 97.5%.

Description

Process for preparing butyl (meth)acrylate technical field The present invention relates to a kind of preparation method of organic compound Background technique Catalysts for the esterification reaction of (meth)acrylic acid and alcohol are generally ion exchange resins or strong acids, and strong acids are often used in the esterification reaction of higher alcohols. The strong acids used as catalysts are further divided into solid acids and liquid acids. The solid acids are generally selected from benzenesulfonic acid and p-toluenesulfonic acid, and the liquid acids are selected from sulfuric acid and methanesulfonic acid. The known esterification process generally selects a single acid as a catalyst. Due to the characteristics of the catalyst itself, some catalysts can make the esterification reaction have a faster reaction rate, or make the reaction have a higher conversion rate, but at the same time, this is often in the form of at the expense of selectivity. On t...

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Problems solved by technology

The known esterification process generally selects a single acid as a catalyst. Due to the characteristics of the catalyst itself, some catalysts can make the esterification reaction have a faster reaction rate, or make the reaction have a higher conversion rate, but at the same time, this is often in the form of at the expense of selectivity

On the contrary, when some highly selective catalysts are used, the reaction speed is often slowed down, which limits the improvement of production capacity.

In the existing process, the esterification reaction is carried out in one or two reactors connected in series, and the water, one of the reaction products, is only removed in one of the reactors. Although this configuration is simple in process, the equipment investment is low , but due to the influence of the concentration of reactants and products, it is difficult to achieve a relatively complete conversion of (meth)acrylic acid, so it is not economical in industrial applications

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