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Fermentation And Production Of Hydroxypropyl Methylcellulose

November 29, 2021by admin0

The production of oil with hydroxypropyl methylcellulose as raw material substrate can realize the utilization of whole sugar, improve the utilization rate of raw materials, reduce the substrate residue in fermentation broth, and reduce the cost of wastewater treatment. This characteristic of hydroxypropyl methylcellulose is conducive to the optimization of batch, feed-batch and continuous fermentation processes, avoiding a series of problems such as controlling medium composition and dilution rate, and is also conducive to regulating the fermentation process.

Hydroxypropyl methylcellulose, which can be made from refined cotton or wood pulp, is crushed before or during alkalization, which is crushed by mechanical energy to destroy the aggregation structure of cellulose raw materials, so as to reduce the degree of crystallinity and polymerization and increase its surface area, so as to improve the accessibility and chemical reaction ability of reaction reagents to the three hydroxyl bases on the macromolecular glucose ring group of cellulose. Although the synthesis principle of hydroxypropyl methylcellulose is not complicated, it is alkalized, crushed and alkalized. Etherification, solvent recovery, centrifugal separation, washing and drying environments involve a large number of key technologies and rich knowledge connotations. For different varieties of products, each environment has recent control conditions, such as temperature, time, pressure and material flow control. Auxiliary equipment and control instruments are product quality.

Because the properties of hydroxypropyl methylcellulose are similar to those of other water-soluble ethers, hydroxypropyl methylcellulose can be used as film-forming agent, thickener, emulsifier and stabilizer in latex coatings and water-soluble resin coatings. the film has good wear resistance, uniform coating and adhesion, and improves the surface tension, acid-base stability and compatibility with metal pigments. Hydroxypropyl methylcellulose has a good effect as a thickener for white water-based polyvinyl acetate paint. The degree of substitution of cellulose ether is improved, and it has strong corrosion resistance to bacteria.

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