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The method for preparing 3-methylthiopropanal

A technology of methionaldehyde and methylthio, which is applied in the direction of sulfide preparation and organic chemistry, and can solve problems such as intensive and complicated costs

Active Publication Date: 2021-02-09
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 3-methylthiopropanal reaction product itself is also prone to side reactions which lead to the formation of high boiling distillation residues
Potential hazards of the substances to be stored must be counteracted with complex and cost-intensive construction and safety measures

Method used

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Experimental program
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Embodiment Construction

[0089] A. The method used:

[0090] 1. Determination of Methyl Mercaptan by Argentometric Titration

[0091] Chemicals used:

[0092] -2-propanol (industrial grade)

[0093] - Sodium acetate in ethanol solution (0.1 mol / l), Bernd Kraft, cat. no. 16590.3700

[0094] - Silver nitrate standard solution (0.1 mol / l), Sigma-Aldrich, Cat. No. 35375

[0095] - Nitrogen

[0096] Alternatively, reagents of comparable quality from other manufacturers can also be used.

[0097] Equipment used:

[0098] -Titrando907, Metrohm, category number 2.907.0020

[0099] -Dosino800, Metrohm, class number 2.800.0020

[0100] -Tiamo TM (Titration Software), Metrohm, Cat. No. 6.6056.221

[0101] - Ag Titrode with sulphide coating, Metrohm, cat. no. 6.0430.100S, with 854iConnect, Metrohm, cat. no. 1.854.0010

[0102] - Titration vessel (150ml), Metrohm, cat. no. 6.1415.250, with lid with 5 openings, Metrohm, cat. no. 6.1414.010

[0103] - Retaining ring for titration vessel, Metrohm, cat. no....

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Abstract

The invention relates to a process for the preparation of 3-methanal by reacting methylmercaptan with acrolein, wherein: in the reaction to obtain 3-methanal, there is a stoichiometric deviation of methylmercaptan and acrolein Compensation by supply or by formation of 1,3‑bis(methylthio)‑1‑propanol and involving 1,3‑bis(methylthio)‑1‑propanol as methylmercaptan and / or 3‑methylthiol use of the stored form of propionaldehyde.

Description

technical field [0001] The present invention relates to a process for the preparation of 3-methylthiopropanal by reacting methylmercaptan with acrolein, wherein the stoichiometric deviation of the reactants is achieved either by supplying or by forming 1,3-bis(methylthio)- 1-propanol, and also to the use of 1,3-bis(methylthio)-1-propanol as a storage-stable form of methylmercaptan and / or 3-methylthiopropanal. Background technique [0002] 3-Methylthiopropanal is also known as the abbreviation MMP for methylmercaptopropanal or as 4-thiovaleraldehyde (UN No. 2785), and is the production of D,L-methionine and its hydroxyl analogs An important intermediate of 2-hydroxy-4-methylthiobutyric acid (also known by the acronym MHA for methionine hydroxy analog). The preparation of 3-methylthiopropanal by reacting methylmercaptan with acrolein is known from the prior art. It is also known from the literature that this reaction proceeds exothermically. This heat of reaction is problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C319/18C07C323/22
CPCC07C319/18C07C323/22C07C319/14C07C323/12
Inventor S·劳滕贝格S·杰伊兰M·克费尔J·希尔德H·雅各布C·凯泽R·马尔茨科恩T·默克A·诺德席尔德
Owner EVONIK OPERATIONS GMBH