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A PROCESS FOR PRODUCING A METHYLCELLULOSE OR HYDROXYALKYL METHYLCELLULOSE

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  • Title:
    A PROCESS FOR PRODUCING A METHYLCELLULOSE OR HYDROXYALKYL METHYLCELLULOSE
  • Author: PETERMANN, Oliver ; KNARR, Matthias
  • Subjects: CHEMISTRY ; COMPOSITIONS BASED THEREON ; DERIVATIVES THEREOF ; METALLURGY ; ORGANIC MACROMOLECULAR COMPOUNDS ; POLYSACCHARIDES ; THEIR PREPARATION OR CHEMICAL WORKING-UP
  • Description: Methylcellulose or hydroxy alkyl methylcellulose is efficiently produced in a process that comprises the steps of a) contacting cellulose with an aqueous alkali hydroxide to produce alkali cellulose; b) reacting the alkali cellulose produced in step a) with a methylating agent in the presence or absence of a hydroxy alkylating agent to obtain a first reaction mixture; c) contacting the first reaction mixture obtained in step b) with solid alkali hydroxide having a water content of not more than 20 wt.%, based on dried alkali hydroxide, with or without contacting a second amount of a methylating agent with the first reaction mixture, to obtain a second reaction mixture; and d) isolating the produced methylcellulose or hydroxy alkyl methylcellulose from the second reaction mixture.
  • Creation Date: 2024
  • Language: English;French;German
  • Source: esp@cenet
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