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HPMC (Hydroxypropyl Methylcellulose) Production Overview

HPMC is produced from refined cellulose (such as cotton or wood pulp) through a series of chemical processes:

  1. Alkalization: The cellulose is treated with sodium hydroxide to activate hydroxyl groups.

  2. Etherification: The alkalized cellulose reacts with methyl chloride (MC) and propylene oxide (PO) to introduce methoxy and hydroxypropyl groups.

  3. Neutralization and Washing: The reaction mixture is neutralized and thoroughly washed to remove by-products like salts and unreacted chemicals.

  4. Drying: The wet product is dried to a specific moisture level.

  5. Milling and Sieving: The dried material is milled into fine powder and sieved to ensure uniform particle size.

  6. Packaging: Final product is packed under controlled conditions to maintain quality.

This process ensures that the HPMC meets specific viscosity, purity, and substitution degree requirements for applications in construction, pharmaceuticals, food, and more.

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