Polymer Screening Assembly for Low-Entrainment Vapor Separation

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Solution Overview

Problem

In solution polymerization processes, the rapid pressure drop during vapor-liquid separation leads to significant polymer entrainment in vapor streams, causing fouling in subsequent equipment and reducing heat removal and separation efficiency, which can impact reactor temperature control and production capacity.

Innovation Solution

A screening assembly and process that includes a first screening step where a condensed phase of hydrocarbons is sprayed into the polymer-lean vapor stream from a separation device, followed by additional screening using cyclones and filters to reduce polymer entrainment, utilizing gravity separation and condensation to enhance separation efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If rapid pressure drop is used during vapor-liquid separation to increase separation speed, then productivity is improved, but polymer entrainment in vapor streams increases causing fouling

Engineering Contradiction:

Improveseparation speedVSAvoidpolymer entrainment

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

A screening assembly is introduced as an intermediary device between the flash separator and subsequent equipment. This assembly includes a screening element with openings that allows vapor to pass through while blocking polymer particles, thus preventing polymer entrainment in the vapor stream without compromising separation speed

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The screening assembly extracts and removes polymer particles from the vapor stream at the point of separation. By placing the screening element in the vapor path, polymer particles are separated and retained while clean vapor continues to the next process stage

Inventive Principle:

Principle #2Taking out (Extraction)

2Temperature

If polymer concentration in reactor is kept low to control exothermic heat production, then temperature control is improved, but amount of polymer requiring separation increases

Engineering Contradiction:

Improvereactor temperature controlVSAvoidpolymer amount

Core Design Contradiction:

TemperatureVSQuantity of substance

Solution Approach 1:

The screening assembly acts as an intermediary separation device that efficiently removes polymer from the effluent stream. This enables better temperature control during polymerization by allowing continuous operation at optimized polymer concentrations while the screening device handles the increased polymer separation load

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If multi-step evaporation processes are used to achieve low volatile levels, then polymer purity is improved, but device complexity and energy consumption increase

Engineering Contradiction:

Improvevolatile level reductionVSAvoidnumber of process steps

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The screening assembly performs preliminary separation of polymer from vapor immediately after the flash separation step. By removing polymer particles early in the process, subsequent evaporation steps operate more efficiently with reduced fouling, allowing volatile removal to be achieved with fewer or simpler process steps

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The rapid pressure drop that causes polymer entrainment is converted into a benefit by using the screening assembly to capture these particles. The high-velocity vapor flow that would normally carry polymer forward is instead used to push polymer particles through the screening element, achieving effective separation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The process effectively reduces polymer entrainment into vapor streams, minimizing fouling and maintaining equipment efficiency, thereby ensuring stable reactor operation and reducing energy costs.

Implementation Method 1

spraying a condensed phase comprising a mixture of hydrocarbons into the vapor stream

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 2

utilizing gravity separation and condensation to enhance separation efficiency

Methodology Applied

Scientific EffectGravity separation: Gravitation

Data Source

PatentUS12599883B2Screening assembly and process for screening polymer from an effluent stream at reduced levels of polymer entrainment

Publication Date: 2026.04.14 BOREALIS GMBH

AI summary

A process for screening polymer from a polymer-lean vapor stream, whereby the process comprises the steps of separating an effluent stream comprising the polymer and a first mixture of hydrocarbons into a polymer-rich stream and the polymer-lean vapor stream; spraying a condensed vapor composition comprising a second mixture of hydrocarbons into the polymer-lean vapor stream via a condensed vapor composition stream; screening a screened condensed vapor composition stream comprising the polymer and the condensed vapor composition from the polymer-lean vapor stream.