The paper introduces the structure and composition of zeolite molecular sieves, and it elaborates the property of zeolite molecular sieves. In this paper, the performance of the adsorption and diffusion of substances in zeolite molecular sieves is reviewed, and the paper lists the main methods of measuring the performance of molecular sieve's adsorption and diffusion coefficients. It also introduces the adsorption and diffusion of different types of molecular sieves. In the present study, each method of measuring the adsorption performance of zeolite molecular sieves has certain applicable conditions. Due to the difference of measurement mechanism, boundary conditions and assumptions, the diffusion coefficients obtained by different methods are also different. Therefore, the appropriate measurement method will be selected according to the actual experimental situation. As different molecular sieves have different substrates suitable for adsorption, it has different application values.

The common research methods for the adsorption and diffusion of zeolite molecular sieves at home and abroad, the characteristics and applicable scope of each method, and the research status of adsorption and diffusion phenomena at home and abroad are introduced. The research results of domestic and foreign scientific research workers are systematically introduced. On this basis, the scientific problems that existed in this field are put forward. Aiming at these problems, a research program by using gas chromatography for the study of adsorption and diffusion phenomena is proposed. The principle of gas chromatography and the method of adsorption and diffusion are described in detail. The corresponding formulas are deduced, and the application of gas chromatography in the study of adsorption and diffusion is also prospected.

The research status of C ₄olefin polymerization at home and abroad is briefly described, and the chemical utilization ways of C ₄ olefins are summarized combining with the progress of relevant technology. Isobutylene was used as an example to introduce the chemical reaction mechanism of the oligomerization; the catalytic properties and research situation of solid phosphoric acid catalyst, zeolite catalyst are emphatically described. According to the present situation of the utilization of low carbon olefins in China, the development prospects and suggestions of C ₄ are put forward.

The pneumatic transmit experiments with the size of sand of 1.2 mm were carried out with compressed air as pumped in the T pipeline experimental bench. Numerical simulation analysis is carried out of the pneumatic transmit process under different condition of the transmission flow and pressure, whereas the change of pressure drop and gassolid two phase volume fraction in branch pipe was achieved. Numerical simulation results show that, pressure drop is proportional to the transmission flow and pressure in the lower part of the pipe, whereas particle volume fraction is inversely proportional to the transmission flow but proportional to transmission pressure. Gas volume fraction is proportional to flow, but it is inversely proportional to pressure. The simulation results are in good accordance with the experiment results. The study provides relevant basis for the further research of the pneumatic conveying.

The removal of propanal from high pressure return gas by adsorbing with activated carbon has been carried out. The effect of temperature and feed gas velocity on the removal rate and breakthrough curve has been studied, and the recycled sorbents by different recycling methods were also evaluated. The experimental results show that removing rate of propanal was the highest at 30 ℃. The removing rate of propanal maintained between 70%~90% at the feed gas flow of 30 mL/min. After active carbon adsorbed for 570 minutes, the removing rate of propanal has dropped to about 30% and reached to its adsorption saturation. The removal rate of propanal was above 95% after recycling activated carbon for 3 times at 120 ℃ by steam, which is better method compared with N2blowing method and heating in vacuum.