At present, the biggest problem in lignin research is how to achieve efficient depolymerization of lignin, which is mainly due to the structural instability of lignin. In view of this problem, the natural structure of lignin, the structural changes of lignin in the process of separation and depolymerization were summarized and the specific effects of structural changes of lignin on the depolymerization process were also discussed. Literature survey shows that maintaining the structural integrity of lignin plays a key role in promoting the depolymerization of lignin, and put forward the prospect of the development trend of lignin depolymerization.

The application of M⁃MOF⁃74 series in CO ₂ removal of natural gas was studied. The skeleton model of M⁃MOF⁃74 was established. The adsorption of pure CO ₂ gas and CO ₂/CH ₄ mixed gas in M⁃MOF⁃74 series adsorbent was calculated by GCMC method. The results showed that the order of adsorption of CO ₂ by M⁃MOF⁃74 adsorbent was Mg⁃MOF⁃74 > Ni⁃MOF⁃74 > Co⁃MOF⁃74 > Fe⁃MOF⁃74 > Cr⁃MOF⁃74 > Mn⁃MOF⁃74.When adsorbing mixed gases, the adsorption amount of CO ₂ by each adsorbent is consistent with that of pure CO2 adsorption, and the adsorption amount of CH ₄ is: Mg⁃MOF⁃74>Ni⁃MOF⁃74≈Co⁃MOF⁃74≈Fe⁃MOF⁃74≈Cr⁃MOF⁃74≈Mn⁃MOF⁃74. The law of isosteric heat of gas on M⁃MOF⁃74 is the same as that of adsorption capacity, indicating that the interaction between gas and M⁃MOF⁃74 is the main factor affecting the adsorption amount. The selectivity of each adsorbent to mixed gas: Ni⁃MOF⁃74>Co⁃MOF⁃74>Fe⁃MOF⁃74>Mn⁃MOF⁃74>Cr⁃MOF⁃74>Mg⁃MOF⁃74. Comprehensive comparison of CO ₂ adsorption capacity, regeneration energy consumption, selectivity coefficient and other parameters, Ni⁃MOF⁃74 is more suitable for the adsorption and separation of CO ₂ in natural gas.

Index data of Liaoning province from 1980 to 2012 in urban and rural resident per capita income and GDP growth was analyzed. From the overall and local angle and correlation coefficients correlation characteristics between the three were obtained, and further the autoregressive model of vector variables was established, and the impulse response function was used to investigate the dynamic relationship between the three. The research results showed that there was a close correlation between GDP growth and urban and rural income growth, but the trends did not synchronized|from the perspective of dynamic link between the three, GDP growth in Liaoning province had a clear role in promoting urban and rural income growth, however the income increase of urban and rural residents had no obvious role on GDP the growth. And the effective measures should be taken to narrow the gap between city and countryside, and strive to achieve synchronous growth of income and GDP.

The steam dryness is an important quality parameter of steam. The dryness of wet steam included in high-pressured and high temperature wet steam injected into the oil layers has the important influence to the extraction efficiency. In order to realize high quality control of steam dryness in the stream-injection boiler, a computation method of steam dryness was proposed. Through this method, the steam dryness along the pipelines was firstly calculated, then vapor temperature and heat loss in the pipelines were obtained. Finally, steam dryness at the random place in the pipeline was solved. The change situation of the steam dryness in steam pipeline system was studied, which provides the reference for the heating mining system technological design.

According to the consumption status of rural residents in 2005, using SPSS15.0 statistics analysis software, an empirical analysis on consumption structure of rural residents of 31 regions was made by adopting factor analysis method and cluster analysis method of multiplex statistics analysis. The common factors affecting the consumption structure were investigated. The analysis results show that the support of national policies has a significant influence on consumption structure of rural residents.