Ligno Sulfonate

1. We XYD CHEM supply sodium lignosulphonate, calcium lignosulphonate, ammonium lignosulfonate, magnesium ligno sulphonate.

2. Lignosulphonate, or lignosulfonate, or sulfonated lignin, (CAS No. ********6) are water-soluble anionic polyelectrolyte polymers: they are byproducts from the production of wood pulp using sulfite pulping. Most delignification in sulfite pulping involves acidic cleavage of ether bonds, which connect many of the constituents of lignin.     The primary site for ether cleavage is the α-carbon (carbon atom attached to the aromatic ring) of thepropyl (linear three carbon) side chain. The following structures do not specify the structure since lignin and its derivatives are complex mixtures: the purpose is to give a general idea of the structure of lignosulphonates. The groups labeled "Q" can be a wide variety of groups found in the structure of lignin. Sulfonation occurs on the side chains, not on the aromatic rings,    Sodium  lignosulphonate or calcium lignosulphonate have very broad ranges of molecular mass (they are very polydisperse). A range of from ***0–**0,**0 da has been reported for softwood lignosulphonateswith lower values reported for hardwoods.

    Sodium Lignosulphonates, calcium lignosulphonate, megnesium lignosulphonate and ammonium lignosulphonatesare recovered from the spent pulping liquids (red or brown liquor) from sulfite pulping. The most widely used industrial process is the Howard process, in which *0–*5% yields of calcium lignosulfonates (CAS number *******3), are precipitated by adding of excess calcium hydroxide. Ultrafiltration and ion-exchange can also be used to separate lignosulfonates from the spent pulping liquid. A list of CAS numbers for the various metal salts of lignosulfonate is available.

    Lignosulfonates have a wide variety of applications.The single largest use for lignosulfonates is as plasticizers in making concrete, where they allow concrete to be made with less water (giving stronger concrete) while maintaining the ability of the concrete to flow. Lignosulfonates are also used during the production of cement, where they act as grinding aids in the cement mill and as a rawmix slurry deflocculant (that reduces the viscosity of the slurry).

    Lignosulfonates are also used for the production of plasterboard to reduce the amount of water required to make the stucco flow and form the layer between two sheets of paper. The reduction in water content allows lower kiln temperatures to dry the plasterboard, saving energy.

    The ability of lignosulfonates to reduce the viscosity of mineral slurries is used to advantage in oil drilling mud, where it replaced tannic acids from quebracho (a tropical tree).Lignosulfonates are used to disperse pesticides, dyes, carbon black, and other insoluble solids and liquids into water. They are used in tanning leather. They are also used to suppress dust on unpaved roads.Dimethyl sulfide and dimethyl sulfoxide (an important organic solvent) are produced from lignosulfonates.