Recovered-carbon-dioxide purifying method and methionine manufacturing method including recovered-carbon-dioxide purifying step

Patent metadata

Field	Value
Publication number	US-11577190-B2
Application number	US-201816608066-A
Country	US
Kind code	B2
Filing date	Apr 27, 2018
Priority date	Apr 27, 2017
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

The present invention provides a method for purifying carbon dioxide gas characterized in that carbon dioxide gas containing at least one of 3-methylmercaptopropionaldehyde and acrolein is contacted with activated carbon to remove at least one of the 3-methylmercaptopropionaldehyde and acrolein. The present invention provides also a method for producing methionine comprising the purification step of the recovered carbon dioxide.

First claim

The invention claimed is:

1. A method for producing methionine comprising the following steps:
A. a step of reacting methyl mercaptan with acrolein to obtain 3-methyl mercaptopropionaldehyde;
B. a step of reacting the 3-methylmercaptopropionaldehyde with hydrocyanic acid (hydrogen cyanide) to obtain 3-methylmercaptopropionaldehyde cyanohydrin;
C. a step of reacting the 3-methylmercaptopropionaldehyde cyanohydrin with carbon dioxide and ammonia or ammonium carbonate to obtain 5-(2-methylmercaptoethyl)hydantoin;
D. a step of hydrolyzing the 5-(2-methylmercaptoethyl)hydantoin in the presence of an alkali compound to obtain a reaction solution containing an alkali salt of methionine; and,
E. a step of introducing carbon dioxide into the reaction solution containing the alkali salt of methionine, precipitating methionine, and separating the precipitated methionine, and
further comprising at least one of 1) a step of recovering carbon dioxide gas used in an excess amount in the step C and 2) a step of recovering carbon dioxide gas generated in the step D, wherein the recovered carbon dioxide gas contains at least one of acrolein that remains unreacted in the step A and 3-methylmercaptopropionaldehyde that remains unreacted in the step B, and
further comprising a step of contacting the recovered carbon dioxide gas with an activated carbon, and purifying the recovered carbon dioxide gas by removing at least one of the 3-methylmercaptopropionaldehyde and the acrolein.

2. The method for producing methionine according to claim 1 ,
wherein the method comprises both the step of recovering the carbon dioxide gas used in excess amount in the step C and a step of recovering the carbon dioxide gas generated in the step D.

3. The method for producing methionine according to claim 2 ,
wherein the recovered carbon dioxide gas used in excess amount in the step C and the recovered carbon dioxide gas generated in the step D are mixed and the mixed recovered carbon dioxide gas is contacted with the activated carbon.

Assignees

• Sumitomo Chemical Co

Inventors

• Iwasaki Ryosuke
• Katayama Takuya
• Omoto Norihito
• Koizumi Yoshiyuki
• Katagami Ryousuke

Classifications

• C07C319/20

  by reactions not involving the formation of sulfide groups · CPC title

• B01D53/96

  Regeneration, reactivation or recycling of reactants · CPC title

• B01D53/04

  with stationary adsorbents {(B01D53/025 takes precedence)} · CPC title

• C07C323/57

  the carbon skeleton being further substituted by nitrogen atoms, not being part of nitro or nitroso groups · CPC title

• C01P2006/14

  Pore volume · CPC title