Clean technique for producing acrylate-hydroxy ester by adopting continuous process

Abstract

The invention discloses a clean technique for producing acrylate-hydroxy ester by adopting a continuous process. The clean technique for producing acrylate-hydroxy ester by adopting the continuous process comprises the following steps: 1) dissolving a catalyst and a polymerization inhibitor in acrylic acid, mixing and measuring, and then continuously pumping the obtained mixture into a tubular reactor with ethylene oxide at a certain ratio, wherein the mole ratio of acrylic acid to ethylene oxide is 1:(1.1-1.5); and 2) after reaction is finished, recycling ethylene oxide through low boiling fraction removal, and causing the rest reaction product to continuously enter an evaporator, so that the finished product is obtained. The clean technique for producing the acrylate-hydroxy ester by adopting the continuous process has the beneficial effects that ethylene oxide is excessive, so that the reaction time is short, and less byproducts are produced; reaction polymerization and reaction exotherm controllability is improved, and the production safety is greatly improved; the reaction time is short, the usage amount of the polymerization inhibitor is reduced, colour number can be effectively reduced, and the production cost is reduced; no steam is consumed in a continuous reaction process, and the production energy consumption is reduced; no replacement is required to be carried out after reaction is normally carried out, basically no nitrogen is consumed during production, and the amount of waste gas discharged out is reduced; and ethylene oxide in a degassing process during normal production can be recycled and is not discharged out, so that no pollution is produced to the air and water.

Description

technical field [0001] The invention relates to a continuous clean production process of hydroxyacrylate. Background technique [0002] Hydroxyl acrylate is a special ester of acrylic acid, including four products: hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, and hydroxypropyl methacrylate. Since the products have the same reaction type and similar reaction conditions, they can be produced in one set Equipment switching production. At present, the addition process of (meth)acrylic acid and ethylene oxide (propylene) oxide is used. Taking hydroxyethyl acrylate as an example, first add acrylic acid to the reaction kettle, and then dropwise add ethylene oxide to control the reaction temperature 70-90 ℃, the finished product is obtained after degassing and film evaporation after heat preservation. [0003] Due to the longer reaction and heat preservation time, the reaction by-products diethylene glycol acrylate and ethylene glycol diacrylate are mo...

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Problems solved by technology

[0003] Due to the longer reaction and heat preservation time, the reaction by-products diethylene glycol acrylate and ethylene glycol diacrylate are more, the product quality is unstable, and the average product content is only about 93%; in the degassing link in the production process, the ring Oxyethane dissolves in water after extraction, which may cause certain pollution to the water body; the esterification reaction is a batch process, which requires continuous replacement, feeding, heating, reaction cooling, and discharging, resulting in large quality fluctuations, high energy consumption, and high labor intensity for operators.

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