Sponsor(s): Chemical Industry and Engineering Society of China; Chemical Industry Press
12 issues per year
Current Issue: Issue 05, 2020
CIESC Journal is supervised by China Association for Science and Technology and sponsored by Chemical Industry and Engineering Society of China, and Chemical Industry Press. The predecessor of the journal is Journal of China Chemical Industry Association launched in 1923 and Chemical Engineering launched in 1934. The journal aims at reflecting the major achievements of fundamental research and application in chemical and engineering and other related fields, as well as new technologies and methods. Its scope covers thermodynamics, separation engineering, process system engineering, bio-engineering and chemical engineering, energy and environmental engineering, material chemical engineering and nanotechnology, and modern chemical technology. The journal is included in CA, JST, Pж(AJ), EI, CSCD.
Director: Zhao Yingli
CIESC Journal,2020,Vol 71,No. 05
Pure-silica zeolite Silicalite-1 powder was pressed at 6 MPa pressure to form self-supporting pellets. Revealed by the characterization of powder X-ray diffraction and 77 K nitrogen adsorption-desorption, there was no change in crystal structure and specific surface area after pelletization. The single-component adsorption equilibrium isotherms of CH 4 and N 2 on the self-supporting pellets Silicalite-1 at 273/298/313 K were measured by static gravimetric method. The selectivity of CH 4/N 2 mixtures on the adsorbent was calculated from ideal adsorbed solution theory (IAST). The separation effects of CH 4/N 2 mixtures on the adsorbent were investigated by dynamic mixtures breakthrough experiments, which show that it is more suitable for enrichment and nitrogen removal from low-concentration coal-bed methane. The separation and enrichment of methane from low-concentration coal-bed methane by pressure swing adsorption (PSA) on the particle-shaped Silicalite-1 were predicted using total mass-transfer model by numerical simulation based on the abovementioned data. The simulation results showed that once the 20%/80% CH 4/N 2 mixture was concentrated, the CH 4 concentration can be increased to 37%–41%, and the recovery rate can be 60%–92%; once the 30%/70% CH 4/N 2 mixture is concentrated, the CH 4 concentration can be increased to 50%–53%, and the recovery rate is 58%–92%.
Experimental study on the hydrogen production with RED reactor powered by concentration gradient energy
CIESC Journal,2020,Vol 71,No. 05
The hydrogen production technology by low-grade heat (LGH) is that the LGH is first converted to the concentration gradient energy (CGE) of solutions, and then it is converted to hydrogen energy by a reverse electrodialysis (RED) reactor. In order to verify the hydrogen production with the RED reactor powered by CGE, and to explore the influence of key operating parameters on the energy conversion process, we developed an experimental system of hydrogen production with RED reactor powered by CGE. The RED reactor in the system consisted of 40 membrane pairs and NaCl and NaOH aqueous solutions were used as the working solutions and the electrode rinse solution respectively. By changing the inlet concentration of diluted or concentrated solution, the flow velocity of solution through the membrane and the output current, we investigated the effects of those parameters on the hydrogen production rate, hydrogen production and energy conversion efficiencies experimentally. The results showed that the variations of inlet concentrations and the flow velocity through the membrane would significantly affect the output current of the RED reactor. Under the short circuit condition of the external circuit, the larger the output current, the higher the hydrogen production rate and hydrogen production efficiency of the reactor, but the lower the energy conversion efficiency.