wood lignin

Lignin and Cellulose

To solve cellulose purification process of the environmental pollution problems caused , Beijing Dream Fox Yutong fiber research and development center has successfully developed a zero pollution, zero emissions , high utilization of the ” green energy biomass organic component separation process technology .”

It is understood that this technology after full trial , from bamboo , wood, fruit branches , shrubs , reeds, straw and other plant extracts to effectively separate the cellulose , hemicellulose, lignin and various organic ingredients, raw material utilization high . The project involves the extension of technical textiles, paper , energy, chemicals, building materials and aerospace , military and other major areas . The advent of technology breakthroughs in the industry has been using a traditional ” acid Law” pulping technology bottlenecks. First , from the source to solve the pulp and paper industry , ” black liquor ” in emissions , while access to a variety of high-value products , the technology of the current energy conservation, development of low-carbon circular economy has played a certain role in promoting.

This new technology will become separated from the plant cellulose, hemicellulose new , new high-purity lignin three ingredients , the separation step into the first mechanized plant lignin and fiber , integrated pulp fiber elements that , according to need and then Fully fibrinolytic through physical methods can be divided into cellulose and hemicellulose .

Purified using this technique has the following three components of the secondary characteristics: characterized in that the fine cellulose fibers or long fibers state , different plants and residual lignin appear pale yellow or white , since the basic removal of lignin cellulose pulp is high , > 90% purity , whiteness 60% ~ 85% ISO, and advanced chemical pulp quality is quite far superior to other semi-chemical pulp and mechanical pulp ; hemicellulose new feature is the last solid , pale yellow or white , composition mainly pentosan , content of> 50% , is a new type of plant products, with a wide range of applications , there is no separation of the production plant hemicellulose industrialization process technology and application manufacturers ; novel characteristics of high purity lignin is black solid with heat melting the ash can be less than 1% , lignin molecular weight <4000 , with oil nature , can produce a variety of chemical products, is a new type of raw material , no similar products in the market , this is the difference between lignin and other significant sign of the pulping process .

It is reported that the technology is basically the plant raw material can get 100% utilization , while the traditional chemical methods to extract plants only Holocellulose target products, making the plant the plant raw material utilization is about 30% to 40% , a lot of material is wasted , including most of the lignin , and a small amount of cellulose and hemicellulose are pollution and waste . Conventional chemical methods of extraction from plant cellulose integrated mechanical pulp can reach 90%, but due to the large mixing of lignin , the pulp quality is low , is difficult to bleach , products can not be stored for a long , narrow range of applications , can only do some low secondary products, plants can not achieve a high use value.

This new technology will plant the three major components of cellulose, hemicellulose , lignin and trace amounts of ingredients , all of separation and extraction into high value products , waste is zero, i.e. there is no source of pollution , and the use of closed production , participation in all the raw materials and plant responses recycle and reuse in order to achieve zero pollution, zero emissions. Compared to conventional pulp and paper industry goal of preparing the cellulose components of the plant , all of the lignin and some hemicellulose, as waste and manufacturing burdens , mixed with chemical reaction to form a pulp waste water, with high COD, BOD, SS, AOX load refractory in nature , ecological damage , serious pollution of the environment has become a major source of pollution .

In nature, after cellulose, lignin reserves , and every year 50 billion tons of speed regeneration. Pulp and paper industry plants were isolated from each year about 140 million tons of cellulose , and lignin get 5000 tons of products, but so far , more than 95 % of the lignin is still ” black liquor ” form directly into after concentration of rivers or burned , rarely used effectively . In the development of the technology to extend , the lignin can be a coal and oil does not rely as raw materials to obtain a carbon fiber material . The technology of carbon fibers may be melt- spun filament diameter of 5 to 20 microns carbon fibers , melt blown microfiber diameter less than 5 microns fiber, less than 100 nanometers in diameter electrospinning carbon fiber , its performance can be achieved high strength, high modulus, high flexibility requirements.

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