Control method and control system for esterification process in polyester resin synthesis
The technology of a polyester resin and a control method, which is applied in the field of chemical synthesis control, can solve the problems of high energy consumption, large loss of raw material alcohol, influence on synthesis effect, etc., and achieves the effect of reducing the amount of loss and reducing the consumption of heat
Active Publication Date: 2020-03-31
GUANGZHOU KINTE IND
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Problems solved by technology
However, in the esterification process of polyester resin synthesis, the temperature and reflux ratio required for each stage are different, and both temperature and reflux ratio affect the synthesis effect. However, the above-mentioned control methods all have the following characteristics: only control the synthesis The temperature of the process or only the reflux ratio of the synthesis process is controlled, so that when using the existing synthesis control method to control the synthesis of polyester resin, the loss of raw material alcohol is large and the energy consumption is high
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[0061] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For the step numbers in the following embodiments, it is only set for the convenience of illustration and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art sexual adjustment.
[0062] refer to figure 1 , the embodiment of the present invention provides a control method for polyester resin synthetic esterification process, which is applied to the main control module, and the main control module is connected with the synthetic device of polyester resin, such as figure 2 As shown, the synthesis device includes a reactor 1, a rectification tower 2, a condenser 3, a reflux control module and a concentration detection module, the reactor 1 is connected to the bottom of the rectification tower 2,...
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The invention discloses a control method and a control system for esterification process in polyester resin synthesis. The method includes: determining the step that the esterification process in polyester resin synthesis belongs to; according to the step, presetting heating rate and reflux ratio; detecting the alcohol concentration of distillate; according to the alcohol concentration of the distillate, the preset heating rate and reflux ratio, regulating practical heating rate and reflux ratio. In the method, by determining the step that the esterification process in polyester resin synthesis belongs to at first, then the different heating rate and reflux ratio are preset according to the step that the esterification process in polyester resin synthesis belongs to, and finally, accordingto the alcohol concentration of the distillate, the preset heating rate and reflux ratio, the practical heating rate and reflux ratio are regulated, so that synthesis efficiency of the polyester resin is optimal and loss quantity of raw materials is reduced, and consumption of heat due to reflux water solution during the reaction is reduced. The method can be widely applied to the technical fieldof chemical synthesis control.
Description
technical field [0001] The invention relates to the technical field of chemical synthesis control, in particular to a control method and system for polyester resin synthesis and esterification process. Background technique [0002] The first-stage reaction of polyester resin synthesis for powder coatings is an esterification reaction, which has a small equilibrium constant, and it is necessary to remove the water generated in the raw materials and the reaction to promote the positive shift of the equilibrium. Since the raw materials for polyester resin synthesis include polybasic acids and polyols, among them, neopentyl glycol (or 90% neopentyl glycol aqueous solution), ethylene glycol, methyl propylene glycol, etc. are mostly used in polyols. The boiling point of these alcohols is lower than that of water Close, usually miscible with water in any proportion, therefore, it is difficult to separate the alcohol in the raw material from the water in the system. Existing synthe...
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IPC IPC(8): B01J19/18C08G63/78B01D3/42B01D3/00
CPCB01J19/18B01D3/009C08G63/78B01D3/42
Inventor 曾定李勇程润刘亮王伟跃罗逸
Owner GUANGZHOU KINTE IND