Process for preparing a polymer polyol

Abstract

The invention relates to a process for preparing a polymer polyol, comprising mixing in a reactor vessel, a base polyol, one or more ethylenically unsaturated monomers, a polymerization initiator, optionally a macromer, and optionally a chain transfer agent, and polymerizing the mixture thus obtained at a temperature of 50 to 200° C., wherein after discharging the reactor vessel content, the interior surface of the reactor vessel walls and / or any internals present in the reactor vessel are blasted with round media.

Description

technical field [0001] The present invention relates to a process for preparing polymer polyols. Background technique [0002] In chemical processes that produce or utilize solid materials, solid matter may adhere to the inner walls and any internals of the vessel in which the chemical process takes place. This adhesion may be so strong that after the container has been emptied, the solid matter still adheres to the inner wall as so-called scale. Typically, fouling consists of solid matter that adheres to surfaces. Especially in batch or semi-batch processes it is desirable that as much fouling as possible be removed before the next batch is run or after a certain number of batches. In general, fouling is believed to reduce heat transfer. [0003] A typical process for preparing a polymer polyol involves mixing a base polyol, one or more ethylenically unsaturated monomers, a polymerization initiator, an optional macromonomer, and an optional chain transfer agent in a vess...

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Problems solved by technology

However, it has been found that this acetone wash still results in relatively long batch times as evidenced by the relatively high increase in batch times between batches

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