Treating method and system for crude methylthiopropanal synthesized of methyl mercaptan and acraldehyde

Abstract

The treatment of crude methylthiopropionaldehyde synthesized by the reaction of methyl mercaptan and acrolein includes: sending crude methylthiopropionaldehyde into a low vacuum rectification tower, discharging light components from the top of the tower and sending them into an emulsification tank , discharge the heavier component that contains thiopropionaldehyde from the bottom of the tower; the heavier component that contains thiopropionaldehyde that is discharged from the bottom of the low vacuum rectification tower is sent to the high vacuum rectification tower, from the tower The top discharges and collects the product thiopropionaldehyde, discharges the heavy component from the bottom of the tower and also sends it into the emulsification tank; emulsifies the light component and the heavy component in the emulsification tank to form a uniform and stable emulsion; The emulsion is sent to the incineration plant through the pipeline. The method for processing the crude methylthiopropionaldehyde synthesized by the reaction of methyl mercaptan and acrolein, by emulsifying the light and heavy components into an emulsion, solves the problem that pipelines will be blocked by transporting light and heavy components separately, and eliminates the The occurrence of environmental protection incidents has improved the environment of the production workshop and local residents.

Description

technical field [0001] The invention relates to the treatment of crude methylthiopropionaldehyde synthesized by the reaction of methyl mercaptan and acrolein, in particular to a treatment method and system for by-products in crude methylthiopropionaldehyde. Background technique [0002] Methylthiopropionaldehyde is an important intermediate for the preparation of methionine, which is mainly prepared through the Michael addition reaction of methylmercaptan and acrolein under the catalysis of an organic base. Using this method, methionaldehyde can be prepared under relatively mild conditions, such as under normal pressure at a temperature of 30-40°C, and the yields are all higher than 90%. However, in the reaction process, acrolein polymers and methylthiopropanal polymers, including dimers and trimers, will be produced as by-products, and there will also be a small amount of unreacted methyl sulfide and hydrogen sulfide. , water, methanol, acetic acid, and unreacted methyl me...

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Problems solved by technology

However, because the heavy component is very viscous, like asphalt, there is no suitable pump with good sealing performance to transport this viscous substance during the process of transporting to incineration, and it is also very easy to block the pipeline; and once the pipeline is blocked , not only will affect the continuous and stable production of the workshop; but also in the process of overhauling the clogged pipeline, the heavy component will leak into the environment, resulting in serious environmental pollution

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