Method for continuously producing high-molecular-weight polyether by adopting micro-channel reactor

Abstract

The invention relates to a method for producing high-molecular-weight polyether by adopting a micro-channel reactor. The method adopts a micro-reactor, a micro-mixer, a pretreatment kettle, a preheating pipe, a delay pipe, a metering pump A, a metering pump B, an epoxy compound storage tank B, a collection kettle, a neutralization kettle, a desalting device, a post-treatment kettle, a back pressure valve and a pressure gauge. The micro-reactor is provided with a plurality of micro-channels, two micro-reactor feed ports and a micro-reactor discharge port; the micro-reactor, the micro-mixer andthe delay pipe form a micro-reaction unit; the desalting device comprises a post-treatment kettle and a filtering machine; and the pressure gauge is arranged between the micro-mixer and the back pressure valve. The method is advanced and scientific, the micro-reactor system adopted in the method is rapid and uniform in mixing, the over-temperature phenomenon is avoided, side reactions are reduced,low-unsaturation-degree and high-molecular-weight polyether can be continuously produced, direct large-scale production can be achieved, and the method has high safety performance and is suitable forindustrial production.

Description

technical field [0001] The invention relates to a method for producing high-molecular-weight polyether by adopting a microchannel reactor, specifically, a method for continuously preparing high-molecular-weight polyether with low unsaturation and narrow molecular weight distribution. Background technique [0002] Narrow molecular weight distribution and high molecular weight polyether have the characteristics of stable quality and performance, and have application prospects in the fields of soft foam polyurethane, high resilience polyurethane, polyurethane elastomer, special coatings, rubber, hydraulic oil, metal cutting fluid, and quenching agent for aircraft materials. Vast, its consumption accounts for about 80% of the total polyether polyol production. In addition, high molecular weight polyether is mainly used in the production of foam stabilizers, water reducers, defoamers, demulsifiers and lubricants. [0003] At present, most of the catalysts used in polymer polyeth...

AI Technical Summary

Problems solved by technology

CN102532513A has reported that its catalytic characteristic of KOH system catalyst is gentle reaction, reaction speed is low, and synthesis cycle is longer, often need to improve reaction speed by ways such as increasing catalyst and propylene oxide concentration, raising reaction temperature, but these measures have increased olefin mostly. The probability of propanol side reactions, forming a vicious circle

However, the whole process is complicated, and the catalyst needs to be preactivated separately in the batch reactor, that is, the double metal cyanide complex catalyst, the initiator and the epoxy compound are induced for a long time, and the amount of the catalyst is large.

In addition CN101121786A in the report batch method, DMC catalytic polymerization system generally has a shortcoming: can not directly use propylene glycol, glycerol as initiator during polymerization, otherwise there will be the shortcoming of a very long induction period in the initial stage of reaction, generally need Preparation of Low Molecular Weight Polyethers by Base Catalysts as Initiators

However, both CN104725169A and CN106279664A did not report on the synthesis of high molecular weight polyether (more than 3000 molecular weight)

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