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Solution polymerization process

A solution and polymer technology, applied in chemical instruments and methods, chemical/physical/physical chemical processes, chemical/physical/physical chemical stationary reactors, etc., can solve problems that do not have lower temperature and pressure

Pending Publication Date: 2021-07-23
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent discloses only the small amount of solvent required for the catalyst support and does not have the advantage of using the lower temperatures and pressures associated with solution polymerization methods

Method used

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Embodiment Construction

[0013] As used herein, the term "continuous stirred tank reactor" or "CSTR" refers to a tank reactor into which reactants are continuously fed and product is continuously withdrawn. The CSTR is mechanically agitated so that there is very near complete backmixing.

[0014] As used herein, the term "boiling reactor" refers to a reactor operated under conditions such that both a liquid phase and a gaseous phase are present. At least part of the solvent and monomer introduced into the reactor in liquid form is evaporated and leaves the reactor in vapor form, thereby removing part of the heat of polymerization, which results in a higher polymer concentration. The vapor stream leaving the reactor is cooled and recycled to the reactor. Any liquid condensed during this cooling process is also recycled to the reactor. These reactors are usually well mixed and can be mixed simply by introducing a vapor recycle stream; however, mixing can be enhanced with the aid of mechanical agitati...

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Abstract

Disclosed herein too is a method comprising charging to a reactor system a feed stream comprising a catalyst, a monomer and a solvent; reacting the monomer to form a polymer; where the polymer is contained in a single phase polymer solution; transporting the polymer solution to a pre-heater to increase the temperature of the polymer solution; charging the polymer solution to a liquid-liquid separator; reducing a pressure of the polymer solution in the liquid-liquid separator and separating a polymer-rich phase from a solvent-rich phase in the liquid-liquid separator; transporting the polymer-rich phase to a plurality of devolatilization vessels located downstream of the liquid-liquid separator, where each devolatilization vessel operates at a lower pressure than the preceding devolatilization vessel; and separating the polymer from volatiles present in the polymer rich phase.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Application No. 62 / 779595, filed December 14, 2018, which is incorporated herein by reference in its entirety. Background technique [0003] The present disclosure relates to a solution polymerization method. In particular, the present invention relates to a solution polymerization process using a high pressure reactor and a liquid-liquid separator combined with thermal activation. [0004] Polymer solutions can exhibit a lower critical solution temperature (LCST) phenomenon, whereby a homogeneous polymer solution separates into a polymer-rich liquid phase and a solvent-rich phase above a certain temperature. The temperature is a function of solvent type, polymer stream composition and pressure. Any of these variables can be manipulated to induce liquid-liquid separation. This separation and the heat load associated with it are very small, especially compared to the evaporatio...

Claims

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Application Information

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IPC IPC(8): B01J19/00B01J19/24C08F6/00C08F10/02C08F2/06
CPCC08F6/003B01J19/2435B01J19/0013B01J19/18B01J2219/00159B01J2219/00245C08F10/02C08F2/06C08L23/04C08F2/001B01J19/2445B01J19/245B01J19/2465B01J2219/00162
Inventor A·Y·王J·鲁巴卡巴M·D·特纳M·J·小佐格P·杰恩
Owner DOW GLOBAL TECH LLC
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