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Effect of Additive Calcium Hydride on Pyrolysis Characteristics of Alkaline Lignin

wallpapers News 2021-11-23
Effect of Additive Calcium Hydride on Pyrolysis Characteristics of Alkaline Lignin
Aiming at the problems of complex distribution of alkali lignin pyrolysis products and low single component content, calcium hydride with strong reducibility was used as an additive. The thermal pyrolysis gas-mass spectrometry analysis method was used to investigate the effect of adding different mass fractions of calcium hydride on alkali lignin. The influence of pyrolysis product composition, transformation and distribution. The results showed that the addition of calcium hydride reduced the types of alkali lignin pyrolysis components from 51 to 20, and promoted the enrichment of the components; the addition of calcium hydride greatly promoted the main product of alkali lignin pyrolysis, Guaiac. The production of phenol and methanol has been increased by 70% and 100% respectively; calcium hydride plays a dual role in hydrogenation reduction and catalytic conversion during the thermal cracking process of alkali lignin, and promotes ketones, acids, and aldehydes, which are the intermediate products of thermal cracking. The reduction and transformation of substances containing unsaturated functional groups such as carboxyl and carbonyl groups are reduced to phenolic and alcoholic hydroxyl groups. The increase of phenolic hydroxyl groups improves the reaction activity of alkaline lignin thermal cracking products, and the increase of alcoholic hydroxyl groups increases the thermal cracking products. The stability. Additive calcium hydride can significantly improve the component distribution, quality and stability of alkaline lignin pyrolysis products.
The characteristics of the pyrolysis products of the three main organic components of wheat straw soda pulping black liquor, alkali lignin, polysaccharides, and lignin-carbohydrate complex (LCC), were studied. The influence of liquid pyrolysis products. The results show that the CO produced by the low-temperature pyrolysis of black liquor comes from the glycan component; the alkali lignin and LCC components are the main sources of phenolic compounds in the tar of the black liquor pyrolysis, and the pyrolysis Furan compounds in tar are mainly produced by the pyrolysis of polysaccharide components; during the steam gasification of alkali lignin, polysaccharides and LCC semi-coke, the solid conversion rate decreases with the increase of the semi-coke formation temperature.
A new metal-catalyzed asymmetric epoxidation of allyl alcohol (AE) seems to be better than all previous asymmetric epoxidation methods of allyl alcohol. One aspect of this relatively simple new method that attracts attention is the enantiomerism The selectivity is very high and the required reagents (+)- or (-)-tartaric acid diester, titanium tetraisopropoxide and tert-butyl hydroperoxide are all easily available.
 

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