Improved process for preparation of 1, 5-pentanediisocyanates from free 1, 5-pentanediamine

The invention provides a method for preparing free PDA by desalting PDA hydrochloride obtained by biological fermentation. The method comprises the following steps: converting lysine hydrochloride into PDA hydrochloride by using lysine decarboxylase; preparing the obtained PDA hydrochloride into an...

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Hauptverfasser: QIU GUISEN, LIU WENJIE, XUE YONGHE, LU CHENGLIANG
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creator QIU GUISEN
LIU WENJIE
XUE YONGHE
LU CHENGLIANG
description The invention provides a method for preparing free PDA by desalting PDA hydrochloride obtained by biological fermentation. The method comprises the following steps: converting lysine hydrochloride into PDA hydrochloride by using lysine decarboxylase; preparing the obtained PDA hydrochloride into an aqueous solution, and adding alkali metal hydroxide into the aqueous solution; evaporating under reduced pressure to remove most water; adding a certain amount of lower aliphatic alcohol; filtering out generated chloride; evaporating under reduced pressure to remove most solvent; optionally, repeating the steps of adding the alcohol, filtering out the chloride and evaporating the solvent under reduced pressure for at least one time; and obtaining a free PDA containing a small amount of the alcohol and a very small amount of water. The invention also provides a method for preparing 1, 5-pentamethylene diisocyanate (PDI) from PDA hydrochloride obtained by biological fermentation, and the method comprises the followin
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The method comprises the following steps: converting lysine hydrochloride into PDA hydrochloride by using lysine decarboxylase; preparing the obtained PDA hydrochloride into an aqueous solution, and adding alkali metal hydroxide into the aqueous solution; evaporating under reduced pressure to remove most water; adding a certain amount of lower aliphatic alcohol; filtering out generated chloride; evaporating under reduced pressure to remove most solvent; optionally, repeating the steps of adding the alcohol, filtering out the chloride and evaporating the solvent under reduced pressure for at least one time; and obtaining a free PDA containing a small amount of the alcohol and a very small amount of water. 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subjects ACYCLIC OR CARBOCYCLIC COMPOUNDS
BEER
BIOCHEMISTRY
CHEMISTRY
ENZYMOLOGY
FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIREDCHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERSFROM A RACEMIC MIXTURE
METALLURGY
MICROBIOLOGY
MUTATION OR GENETIC ENGINEERING
ORGANIC CHEMISTRY
SPIRITS
VINEGAR
WINE
title Improved process for preparation of 1, 5-pentanediisocyanates from free 1, 5-pentanediamine
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