What Are the Industrial Uses of Lignin?

Lignin (Latin, English, German: Lignin) is a complex class of organic polymers that form important structural materials in vascular plants and some algae supporting tissues. Lignin is particularly important in the formation of cell walls, especially in wood and bark, because they impart rigidity and do not easily decay. Chemically, lignin is a cross-linked phenol polymer.

Lignin is a biopolymer with three-dimensional network structure formed by the interconnection of three phenylpropane units through ether bonds and carbon-carbon bonds. It exists in woody tissues. Its main role is to harden cell walls by forming intertwined networks, which are secondary walls. Main ingredients ^[1]

• Lignin is brown powder, the color of wood is caused by lignin.

• Soluble

  • According to the difference in lignin composition, it can be divided into three categories

  • Guaiacol lignin

  • Guaiacol-sinacol lignin

  • Guaiacol-sinapol-p-hydroxybenzene lignin

  • Lignin is a major by-product of the cellulose industry

  • can be used as

    The method for using lignin as a rubber reinforcing agent belongs to the technical field of lignin application in the rubber industry. The main point is to add formaldehyde to the concentrated papermaking waste liquor to make lignin formaldehyde resin, and then add sulfur, zinc oxide, stearic acid, vulcanizing agent, vulcanization accelerator, vulcanization activator and rubber at a certain temperature in proportion. vulcanization. The invention can fill a large amount of lignin in the rubber without adding a softener, which not only saves a large amount of rubber, but also obtains vulcanizates with excellent properties. At the same time, the dust does not fly and pollute the environment during vulcanization. It has great social and economic benefits.

    The main use of wood sodium

    Utilize its cohesiveness, dispersibility and chelation to widely apply in various industries to improve its physical and chemical properties, save costs and increase efficiency.

    1 Enhancer

    In the production of refractory materials and ceramic products, it can reduce water, plasticize, and flocculate. It can also be used in the foundry industry. As an auxiliary binder, it has a large cohesive force and good disintegration.

    2 Mineral powder binder

    The smelting industry mixes ore powder with it to make ore powder balls. After drying, it enters the kiln to improve the smelting recovery rate and can also be used as a mineral dressing agent.

    3 Used as concrete water reducing agent

    When the dosage is 0.2% -0.3%, it can reduce the water consumption of concrete by 10% -12% when mixing, reduce the water-cement ratio, save about 10% of cement, improve the workability, fluidity and permeability of concrete, and improve the concrete. Strength and compactness have early strength effect, shorten setting time, increase compressive strength, and reduce slump loss of concrete.

    4 Antiscalants and corrosion inhibitors

    It is used in industrial containers and pipelines to prevent scale and corrosion and improve the service life of windows and pipelines.

    5 coal water slurry dispersant

    Used as a dispersant in coal-fired coal-fired power plants, etc., as a dispersant to improve the ability to disperse coal, increase the rate of heat generation and utilization of coal, greatly reduce the coal content in fly ash, and reduce bridging and knotting. Block to increase furnace life.

    6 other

    This product can be used as a chemical agent for tertiary oil recovery, as a thinner for oilfield drilling mud, and for sealing wells. In addition, it can also be used in asphalt emulsifiers, feed binders, refining auxiliaries, etc. It is also widely used in pesticide processing, briquette production, leather tanning fillers, carbon black granulation, and control of soil, sand dunes, and powder. ^[5]