Synthetic method of propylene glycol butyl ether acetate

Abstract

The invention relates to a synthetic method of propylene glycol butyl ether acetate. The propylene glycol butyl ether acetate is directly synthesized by direct esterification by propylene glycol butylether and acetic acid as raw materials and sec-butyl acetate as a water-carrying agent under the action of a solid acid catalyst S2O82- / ZrO2-SnO2. The solid acid catalyst S2O82- / ZrO2-SnO2 is preparedby adopting an impregnation method and is high in catalytic activity and less in side reaction, the conversion rate of the propylene glycol butyl ether is 98.73 percent, the yield of the propylene glycol butyl ether acetate is 95.55 percent, and the catalyst can be reused. The defects of a traditional homogeneous catalyst, such as high corrosion to equipment, multiple side reactions, easy coloring of products and difficult separation of the products are overcome. Compared with methylbenzene as a traditional water-carrying agent and the like, the sec-butyl acetate as the water-carrying agent is low in toxicity and environmentally-friendly. The synthetic method provided by the invention is mild in reaction conditions, less in side reaction and easy to industrialize, thereby having good technical economy.

Description

technical field [0001] The present invention relates to the synthesis of propylene glycol butyl ether acetate, take propylene glycol butyl ether and acetic acid as raw materials, take sec-butyl acetate as water-carrying agent, in solid acid catalyst S 2 o 8 2- / ZrO 2 -SnO 2 Under the action of , synthesize propylene glycol butyl ether acetate. It belongs to the technical field of fine chemicals. Background technique [0002] Propylene glycol butyl ether acetate (PBA for short), CAS No. 85409-76-3, structural formula: Belonging to glycol ether ester products, it is an organic solvent with environmental protection, high efficiency and excellent performance. It is widely used in paints, coatings, printing inks, synthetic resins, adhesives, textile printing and dyeing and leather tanning agents and other industries. [0003] Propylene glycol butyl ether acetate is mainly prepared from propylene glycol butyl ether and acetic acid under the action of an acid catalyst. Curr...

AI Technical Summary

Problems solved by technology

Currently commonly used acid catalysts include sulfuric acid, ferric chloride, etc., but they will corrode the equipment, the product after the reaction is dark in color, the product and the catalyst are not easy to separate, and its dehydration and oxidative properties will also lead to a series of side reactions.

Traditional water-carrying agents such as toluene are teratogenic and carcinogenic, and it is urgent to develop catalysts and production processes that are easy to separate, less corrosive, and environmentally friendly to meet the needs of industrial production

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