Polyester polyol continuous production process and equipment

Abstract

The invention discloses a continuous production process and a continuous production device for polyester polyol. In the process, raw materials, polyol and a binary acid or acid anhydride, are subjected to continuous production through a set of the continuous production device to produce the polyester polyol. The production process includes an esterification step and a condensation polymerization step, wherein the esterification step includes the processes of directly increasing the temperature from room temperature to 200-245 DEG C, adding a catalyst, maintaining the temperature to be constant for 0.5-1.5 h; and the condensation polymerization step includes the processes of directly regulating the vacuum degree to 1000-5000 Pa, which is required in polymerization, and performing polymerization for 1.5-2.5 h. The device includes a slurry blending tank, a slurry delivery tank, an esterification kettle, and a condensation polymerization falling film column. A condensing tower is disposed on the top of the esterification kettle. The condensation polymerization falling film column is connected to a vacuum air-lift pipe. The process and the device can continuously and stably produce a qualified polyester polyol product, which proves that continuous production of the polyester polyol is available. The process and the device are improved in production efficiency, save cost on equipment and operations, and reduce energy consumption.

Description

technical field [0001] The invention belongs to the technical field of polyester production, and relates to a polyester polyol continuous production process and device. Background technique [0002] Polyester polyol is one of the main raw materials for the synthesis of polyurethane, which is prepared by polycondensation reaction of dibasic organic carboxylic acid, carboxylic anhydride, ester or half-ester with low relative molecular weight and diol. According to whether the molecular chain of polyester polyol contains benzene ring, it can be divided into two types: aliphatic polyol and aromatic polyol. Aliphatic polyester polyol is milky white solid or colorless to light yellow viscous liquid at room temperature. Solid polyester polyols have a low melting point, generally between 25°C and 50°C, and become viscous liquids after melting. Aliphatic polyester polyols are slightly soluble in water, and the acid value is generally lower than 1.0mgKOH / g. Aromatic polyester polyo...

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Problems solved by technology

For large-volume products with high demand, intermittent production efficiency is low, energy consumption is high, and the quality of batch products is unstable (different batches of products have slight differences in quality)

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