Method for synthesizing acrylic acid and hydroxyalkyl methacrylate

Abstract

The invention discloses a synthesizing method of acroleic acid and methacrylate hydroxyalkyl ester, adopting acroleic acid or methacrylate as raw material; proceeding additional reaction for epoxyethane or epoxypropane with molar rate at 1-1.5: 1 to produce (methyl) acroleic hydroxyethyl (hydroxypropyl) ester; setting the reacting temperature at 60-120 deg.c; using the quantity of catalyst at 0.1-1.0% as reactant.

Description

technical field [0001] The present invention relates to a kind of synthesis method of acrylic acid and hydroxyalkyl methacrylate, in particular to a kind of synthesis method of acrylic acid and hydroxyethyl (or propyl) methacrylate, acrylic acid and hydroxyethyl (or propyl) methacrylate The chemical name of the ester is acrylic acid and methacrylic acid-β-hydroxyethyl (or propyl) ester, and the structural formula is: CH 2 =CR 1 COOCH 2 CHR 2 OH(R 1 , R 2 = H, CH 3 ). It belongs to the field of organic chemical technology. Background technique [0002] Acrylic acid and hydroxyalkyl methacrylate mainly include hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate. It is a colorless and transparent liquid with two active Functional group, carbon-carbon double bond and hydroxyl group, is a highly reactive functional monomer, which has an important use in the synthesis of acrylic resin coatings with excellent performance, ...

AI Technical Summary

Problems solved by technology

[0006] 3. Ethylene (propylene) glycol reacts with (meth)acryloyl chloride to produce hydroxyethyl (meth)acrylate. Since the cost of acid chloride is much higher than that of the corresponding carboxylic acid, it has great potential in industrial application. limitation

[0007] 4. The reaction between ethylene (propylene) glycol carbonate and (meth)acrylic acid can produce (meth) hydroxyethyl (propyl) acrylate. This method has a longer reaction time and a higher reaction temperature. Long time and high temperature will cause side reactions Increase

[0008] 5. Chlorohydrin method, that is, sodium (potassium) acrylate and ethyl chloride (propanol) react to produce hydroxyethyl (propyl) (meth)acrylate. This method has the filtration problem of by-product NaCl and chlorohydrin Disadvantages of high toxicity

However, this type of catalyst is more polluting to the environment, and some need to be used in combination with special co-catalysts and polymerization inhibitors, and it is difficult to recover and treat the chromium in the raffinate after refining

[0012] 2. Iron-based catalysts have good catalytic performance (activity and selectivity), but are poorer than chromium-based catalysts

Images