Video

A typical HEC production workshop includes the following key areas:

1. Raw Material Area

   • Stores refined cellulose (e.g., wood pulp) and chemical reagents like sodium hydroxide and ethylene oxide.

   • Equipped with ventilation and dust control systems.

2. Alkalization Reactor Section

   • Cellulose is mixed with sodium hydroxide to produce alkali cellulose under controlled temperature and humidity.

   • Performed in sealed stainless steel reactors.

3. Etherification Section

   • Alkali cellulose reacts with ethylene oxide to introduce hydroxyethyl groups.

   • Carried out in high-pressure reactors with temperature control and explosion-proof measures.

4. Washing and Purification Area

   • Removes by-products and unreacted chemicals using water and alcohol washing.

   • Filtration and separation units are used here.

5. Drying and Milling Area

   • The wet HEC is dried in fluidized bed or vacuum dryers.

   • Dried material is milled to desired fineness and sieved.

6. Packaging and Storage

   • Final product is weighed, packed (usually in moisture-proof bags), and labeled.

   • Stored in a clean, dry warehouse with humidity control.

The workshop must follow strict safety standards due to the use of reactive chemicals and flammable gases like ethylene oxide.