Co-production preparation method of N-hydroxymethyl acrylamide powder and aqueous product

The invention discloses a co-production preparation method of N-hydroxymethyl acrylamide powder and an aqueous product, which comprises the following steps of: powder production: under the action of a base catalyst, adding paraformaldehyde into an acrylamide aqueous solution with the concentration o...

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Bibliographic Details
Main Authors WANG HENG, ZHUANG XIANJUN, ZHANG HUYIN, WU LEXIAN, XIAO JIE, SUN SHILIANG
Format Patent
LanguageChinese
English
Published 02.12.2022
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:The invention discloses a co-production preparation method of N-hydroxymethyl acrylamide powder and an aqueous product, which comprises the following steps of: powder production: under the action of a base catalyst, adding paraformaldehyde into an acrylamide aqueous solution with the concentration of 30-50%, and reacting for more than 3 hours at the reaction temperature of 65-70 DEG C; then, through vacuum falling film concentration, the concentration of the reaction liquid is increased to 98% or above, and the concentration temperature is 50-65 DEG C; then, the concentrated solution is thinned through a roller scraper and cooled, solidified and crystallized, and a solidified and crystallized layer is scraped off through a scraper; and air-drying for more than 10 hours at the temperature of 20-30 DEG C to prepare the N-hydroxymethyl acrylamide powder. The crystallization extraction rate of the N-hydroxymethyl acrylamide powder can be effectively increased, and the content of free formaldehyde in the N-hydroxy
Bibliography:Application Number: CN202211249608