METHOD OF PREPARING WATER-SOLUBLE SULFURIC ACID ESTERS OF LINGO-CARBOHYDRATE MATERIALS Russian patent published in 2006 - IPC C08H5/04 C07G1/00 C08B11/00 

FIELD: industrial organic synthesis.

SUBSTANCE: invention concerns preparation of sodium salts of sulfate esters of lingo-carbohydrate materials, which can be used as chemical additives to control properties of washing fluids used in boring oil and gas wells. Method of preparing water-soluble sulfuric acid esters of cellulose-based lingo-carbohydrate materials consists in that material is activated with sodium hydroxide and then affected by sodium fluorosulfonate. Activation of mechanically divided lingo-carbohydrate material composed of non-preliminarily separated cellulose, lignin, and hemicelluloses is conducted for 1 h at 70°C and reaction is carried out in isopropyl alcohol fir 3-15 h at 50-90°C and molar ratio of lingo-carbohydrate material to sodium fluorosulfonate equal to 1:(1-1.75).

EFFECT: enabled utilization of total amount of lingo-carbohydrate material, reduced price cost of final product, improved environmental condition, and widened spectrum of properties of final product.

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