Continuous solution polymerization device based on LCST and continuous solution polymerization method by adopting continuous solution polymerization device

Abstract

The invention discloses a continuous solution polymerization device based on LCST, which comprises: a raw material storage tank (1) for storing reaction raw materials; a supercritical fluid storage tank (2) which is used for storing supercritical fluid; a reactor (3), wherein the first material inlet of the reactor (3) is communicated with the material outlet of the raw material storage tank (1) and is used for carrying out polymerization reaction on reaction raw materials to generate a polymer solution containing a solvent, a polymer and a monomer; a liquid-liquid separation tank (4), whereinthe first material inlet of the liquid-liquid separation tank (4) is communicated with the material outlet of the reactor (3), the second material inlet of the liquid-liquid separation tank (4) is communicated with the material outlet of the supercritical fluid storage tank (2), and the liquid-liquid separation tank (4) is used for separating the polymer solution into a dense phase rich in polymers and a dilute phase rich in solvents. The invention also discloses a continuous solution polymerization method by adopting the continuous solution polymerization device. Compared with the prior art,the continuous solution polymerization device disclosed by the invention can be used for carrying out liquid-liquid separation on a polymer solution at a relatively low temperature.

Description

technical field [0001] The invention relates to the technical field of solution polymerization, in particular to an LCST-based continuous solution polymerization device and a continuous solution polymerization method using the continuous solution polymerization device. Background technique [0002] Solution polymerization is an important synthetic method in the process of polymer synthesis. The generated polymer can be dissolved in a solvent, and the product is a solution, also known as homogeneous solution polymerization. The reaction is generally carried out under a pressure of 2.0-4.0 MPa, and the temperature is about After the reaction is completed, the separation technology of polymer and solution (also called devolatilization unit) often determines the energy consumption of the whole process. From common sense, the energy consumption of mechanical separation is often much smaller than that of heat separation. Energy consumption, but mechanical separation requires the s...

AI Technical Summary

Problems solved by technology

[0004] For the above separation method, although compared with heating and evaporation, the energy consumption is relatively less, but heating the homogeneous polymer solution to the phase separation temperature still requires a lot of energy consumption. In addition, in the industry, liquid phase polymerization usually adopts n-hexane is used as a solvent, and the critical temperature of n-hexane is 234°C, the critical temperature of comonomer 1-octene is 294°C, and the optimum reaction temperature is generally around 130°C, the critical temperature of the system is much higher than the reaction temperature Yes, the patent also mentioned that heating is required to reach the critical temperature within 50°C, and the method needs to maintain the temperature in a relatively high range, and the reactivity of the polymerization catalyst increases sharply with the increase of temperature. Therefore, in the liquid The reaction will still be carried out in the liquid-liquid separation tank, so that there is the possibility of polymerization or even implosion in the liquid-liquid separation tank

Images