HEMC MH6M

KimaCell® HEMC MH6M hydroxyethyl methyl cellulose is made of cotton, wood alkalized, ethylene oxide and methyl chloride ether Non-ionic cellulose mixed ether made by chemical process.

At present, the production process of HEMC can be divided into two categories: liquid phase method and gas phase method. The internal pressure of the liquid phase method equipment is small, the requirements for the pressure bearing capacity of the equipment are low, and the risk is small. After the cellulose is soaked in the lye, it will be fully swollen and alkalized.

The osmotic swelling of the liquid is good for cellulose, and the product with a relatively uniform degree of substitution and viscosity can be obtained, and the variety is easy to replace, but the reactor is usually not too large (generally below 15m3), and the production capacity is small. If you want to increase the production, It is bound to increase multiple reactors, and the reaction process requires a large amount of organic solvent as a carrier, and the reaction time is longer (generally more than 10 hours), which increases solvent distillation recovery and time costs. The gas-phase method has compact equipment, high single-batch yield, and the reaction is carried out in a horizontal autoclave. The time (generally 5-8 hours) is shorter than that of the liquid-phase method, and does not require a complicated solvent recovery system. After the reaction is completed, the excess methyl chloride The by-product dimethyl ether enters the recovery system in the form of gas, and is recycled and reused separately. The labor cost is low, the labor intensity is small, and the production cost is lower than that of the liquid phase method, but the investment in equipment and automatic control is large, and the technical content is high. The cost is high.