Simple synthetic route of benzyl methacrylate

Background and Overview

Benzyl methacrylate is an active diluent of acrylic acid, which has the advantages of high flash point and stable storage at room temperature and pressure. Its polymerized products have high refractive index, high hardness, low shrinkage and excellent heat resistance, and can be used as active crosslinking agent and diluent of acrylic resin.

Preparation method:

One:

86.1 parts methacrylic acid, 108.0 parts benzyl alcohol, 7.3 parts toluenesulfonic acid, 3.9 parts hydroquinone and 291.2 parts toluene were poured into a clean four-way flask, vented with N2, and reacted at 110℃ for 4h. The reaction mixed products are successively added to sodium bicarbonate solution, sodium chloride aqueous solution and pure water for washing, and then stand and stratify to obtain an organic layer solution containing the benzyl methacrylate. Control the vacuum degree is not less than -0.09MPa, and the organic solution is distilled under vacuum at 80℃ to remove residual water molecules and small organic molecules. After cooling, benzyl methacrylate was obtained.

Two:

Add 0.0403g hydroquinone, 0.0778g methylhydroquinone, 1.945g silicon dioxide to bond 1 - methyl - 3 - propyl silimidazole bisulfate, 9.014g(0.15mol) isopropyl alcohol, 19.370g(0.225mol) methylacrylic acid, and 0.078 g(0.078 mol) methyl hydroquinone into a 100mL three-way flask. Insert a gas catheter, thermometer and condensing tube, inject air, adjust the gas flow rate of 500mL/min, heat up to 100℃, after 5 hours of reaction, filter and remove the catalyst, wash the reaction liquid with 10% sodium hydroxide aqueous solution until the ester layer is colorless, then wash it with water until it is neutral, stand and separate the water phase, weigh the ester layer to 17.55g. The yield was 91.3%.

Product application

CN201910526061.4 provides a preparation method of a point reducing agent for diesel oil containing benzyl alcohol hydrolysis, which is characterized in that: Step 1: After mixing benzyl methacrylate and maleic anhydride, adding initiator for polymerization reaction, benzyl methacrylate - maleic anhydride binary polymer is obtained; Step 2: After the mixture of benzyl methacrylate - maleic anhydride binary polymer and high carbon alcohol, the catalyst was added for esterification reaction. After the reaction, the solvent was evaporated by vacuum distillation, and then methanol was added to it to produce precipitation. The resulting precipitation was washed and dried in vacuum to obtain a diesel de-point depressant containing phenylcyclic alcoholysis. The preparation method of the invention is simple and the raw materials are cheap and easy to obtain; The low temperature fluidity of diesel oil can be effectively improved, the dosage is less, and the effect of reducing coagulation is good.