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Sodium Carboxyl Methyl Cellulose

Sodium Carboxyl Methyl Cellulose in Tradeasia

IUPAC Name

sodium 2,3,4,5,6-pentahydroxyhexanal acetate

Cas Number

9004-32-4

HS Code

3912.31.00

Formula

C8H15NaO8

Basic Info

Appearance

White Powder or Beige

Common Names

Sodium Carboxymethyl Cellulose, Aquaplast, Carboxymethyl Cellulose

Packaging

1250 @ 20 kg PP/PE Bags, 25 MT / 20FCL

Brief overview

Sodium carboxy methyl cellulose is the sodium salt of carboxy methyl cellulose (CMC), and the carboxy methyl cellulose derivative (-CH2-COOH) is bonded to some of the hydroxy groups of the glucopyranose monomer constituting the cellulose backbone. It is synthesized from the base-catalyzed reaction of cellulose with chloroacetic acid. The polar (organic acid) carboxyl groups make the cellulose soluble and chemically reactive. The functional properties of CMC depend on the degree of substitution of the cellulose structure (i.e., how many hydroxyl groups participate in the substitution reaction), the chain length of the cellulose backbone structure, and the degree of clustering of the Carboxymethyl substituents.

Manufacturing Process

For sodium carboxymethyl cellulose (CMC), the manufacturing process is as follows: raw materials (refined cotton, caustic soda, alcohol) mixed, alkalify, etherification, washing neutralization, squeezing, washing, rake the dry, drying, crushing, and package.

The main chemical reactions of sodium carboxymethyl cellulose are the alkalization reaction of cellulose with alkali to generate alkali cellulose and the etherification reaction of alkali cellulose with monochloro acetic acid.

Step 1: Alkalization: [C6H7O2(OH)3] n + nNaOH→ [C6H7O2(OH)2ONa] n + nH2O

Step 2: Etherification: [C6H7O2(OH)2ONa]n + nClCH2COONa → [C6H7O2(OH)2OCH2COONa] n + nNaCl

 

Detergent Industry 

Following the initial reaction, the resultant mixture produces about 60% CMC plus 40% salts (sodium chloride and sodium glycolate). This product is the so-called technical CMC used as a surfactant in detergents. Further purification removes these salts to produce pure CMC for food, pharmaceutical, and dentifrice (toothpaste) applications.

Other Applications 

CMC is also used as a thickener for pharmaceuticals and as a component of drilling mud in the oil drilling industry as a viscosity regulator and water retention agent. In the food industry, CMC is used as a filler.

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