1.Production process of hydroxypropyl methylcellulose (1)
2.Production process of hydroxypropyl methylcellulose (2)
3.Production process of hydroxypropyl methylcellulose (4)

3. The gas phase method (gas-solid method) production process of HPMC

Add the pulverized cellulose fine powder into a horizontal reactor with a strong stirring device. Directly add a certain amount of lye, etherifying agent and a small amount of recovered low Buddha point by-products, without adding an organic solvent. The etherification reaction was completed in a semi-dry state. After the reaction, wash with hot water, then dry, pulverize and sieve to obtain the finished product.
There is no need to add other solvents in the production process of the process. And after the synthesis reaction is completed, all the unreacted etherifying agent can be recovered. So the technology has obvious cost and environmental protection advantages. However, due to the large investment and high degree of automation, if the equipment does not meet the requirements, it is easy to cause high consumption of propylene oxide and methyl chloride, and poor product uniformity, so it has not been accepted by most manufacturers.
Landcel has many years of experience in the production of cellulose ethers, and its products include: HPMC, HEMC, HEC, HEMC, CMC, RDP. Mainly produces cellulose ethers for construction grades. For in-depth research on the application of HPMC, HEMC, HEC, HEMC, CMC, RDP in various aspects, welcome to consult to obtain free samples.