Production technology of high viscosity sodium carboxymethyl cellulose

Abstract

The invention relates to a production technology of high viscosity sodium carboxymethyl cellulose. The production technology comprises the steps of washing raw materials; smashing; conducting an alkalization reaction, wherein smashed cotton clothes and cotton fabric are put into an alkalization kneading machine, air in the alkalization kneading machine is pumped out and inert gas is pumped into the alkalization kneading machine, the step is repeated for multiple times until vacuum degree in the alkalization kneading machine reaches 0.005 Mpa, and the alkalization reaction is conducted under the protection of the inert gas; conducting an etherification reaction, wherein the alkalized product is put into an etherification kneading machine to be subjected to the etherification reaction; washing; neutralization; centrifugation; drying; obtaining the product after smashing. According to the production technology of the high viscosity sodium carboxymethyl cellulos, discarded cotton clothes and cotton fabric are adopted as raw materials, waste is turned into wealth, the production cost is drastically reduced, the technology is easy to operate, the side product is less, the quality index of the obtained product reaches viscosity 1% B type (Brookfield Viscosity)>7000 mpa.s, the substituted ratio is bigger than 0.95, and the purity is bigger than 99.5%.

Description

technical field [0001] The invention relates to the production field of sodium carboxymethyl cellulose, in particular to a production process of high-viscosity sodium carboxymethyl cellulose. Background technique [0002] Sodium carboxymethyl cellulose, referred to as CMC, is a carboxymethylated derivative of cellulose, also known as cellulose gum, and is the most important ionic cellulose gum. CMC was first produced in Germany in 1918, and was patented in 1921, and then commercialized in Europe. At that time, it was only crude product, used as colloid and binder. From 1936 to 1941, the research on the industrial application of CMC was quite active, and several enlightening patents were published. During World War II, Germany used CMC in synthetic detergents. Since then, the production process, production efficiency and product quality have gradually improved significantly. In 1947, the US FDA proved according to toxicological research that: CMC is non-toxic to physiolog...

AI Technical Summary

Problems solved by technology

However, in recent years, the supply of raw materials has become increasingly tight, and the price of raw materials is high, resulting in high production costs of CMC. Therefore, in addition to the innovation of preparation methods, it is also necessary to seek new low-cost cellulose resources to replace refined cotton to prepare CMC.