Method for preparing high-viscosity and high-etherification-degree sodium carboxymethyl cellulose from jute

The invention relates to a method for preparing high-viscosity and high-etherification-degree sodium carboxymethyl cellulose from jute. The special sodium carboxymethyl cellulose which is low in viscoelasticity and filament dragging ability is provided, and is suitable for being used as a printing-dyeing pasty material. The technological process of the method comprises the following steps: performing pretreatment on jute, performing composite alkaline treatment, bleaching, drying to obtain refined jute cellulose, performing alkalification under a low-temperature nitrogen charging oxygen insulation environment, using low-power ethanol as a medium, feeding segmentally, performing trapezoidal heating, etherifying alkali cellulose by using an etherifying agent as chloroacetic acid to obtain a product of which the ethyloic etherification degree is 1, the 1% aqueous solution viscosity is greater than 400 mPa. s, the 2.5% viscosity is greater than 10000 mPa. s, the PVT is greater than 0.50, and the filament dragging ability is smaller than 5 mm. The sodium carboxymethyl cellulose is very suitable for being used as the printing-dyeing pasty material. Through the adoption of the method, the production cost of sodium carboxymethyl cellulose is effectively reduced, the high-grade model sodium carboxymethyl cellulose is obtained, meanwhile, a high value-added way is found for resourceful jute, the product is stable, the process is reliable, the cost is lower, and an excellent market prospect is provided.