A kind of synthetic device of polyester polyol

Abstract

The invention discloses a polyester polyol synthesis device, which comprises a reaction kettle, a reflux condenser, an intermediate tank and a second condenser. The reaction kettle has a heat transfer oil inlet and a heat transfer oil outlet, and the reflux condenser has a coolant inlet, The second condenser has a coolant inlet and a coolant outlet; the reaction kettle is connected to the intermediate tank, the intermediate tank is connected to the reflux condenser, and the intermediate tank is filled with water-absorbing substances; a temperature control point is set at the outlet of the reflux condenser ; The reflux condenser is connected with the second condenser, and the reaction outlet of the second condenser is divided into two ways to communicate with the vacuum device and the vent valve respectively. The synthesis device of the polyester polyol of the present invention is characterized in that a tundish filled with water-absorbing substances is added between the reaction kettle and the reflux condenser, and compared with the traditional process device, it has the following advantages: fast reaction speed, short reaction time; low energy consumption ; Improve equipment utilization and save investment; waste water treatment is simple and low cost.

Description

technical field [0001] The invention belongs to the technical field of polyester polyol synthesis, in particular to a polyester polyol synthesis device. Background technique [0002] Polyester polyols are formed by polycondensation of small molecule polyols and dibasic acids. This is an equilibrium reversible reaction. During the reaction process, the small molecule water produced during the reaction must be continuously removed to disrupt the balance before the reaction can continue. To make the reaction proceed quickly, the reaction temperature must be increased and the water generated during the reaction must be removed in time. [0003] The dibasic acids used mainly include: [0004] (1) Saturated fatty acids: monooxalic acid, succinic acid, adipic acid, suberic acid, etc.; [0005] (2) Unsaturated fatty acids: maleic acid, fumaric acid, etc.; [0006] (3) Aromatic acids: terephthalic acid, isophthalic acid, phthalic acid or anhydrides. [0007] Polyols are: [0008...

AI Technical Summary

Problems solved by technology

[0015] 2. Lose a certain amount of small molecule polyols

Even if the top temperature of the reflux condenser B1 can be precisely controlled at 100-105°C, a certain amount of small molecule polyols will still be entrained by water vapor, so the excess of small molecule polyols is about 5% higher than the theoretical value

[0016] 3. High energy consumption

resulting in high energy consumption in the entire reaction process

[0017] 4. Long response time

During the reaction process, the condensed water is continuously refluxed and cannot be discharged in time, which inhibits the reaction, and there is water, the temperature of the material rises slowly, the reaction speed of the material is slow, and the reaction time is prolonged

[0018] 5. High cost of wastewater treatment

However, due to the high COD of small molecule polyols entrained by water vapor, the cost of wastewater treatment is high

[0019] At present, some more advanced devices are figure 2 The reflux condenser B1 is changed to a distillation column, which can effectively reduce the discharge of small molecular polyols with water vapor, but it also has problems such as long reaction time and high energy consumption.

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