Phase change solvents for post-combustion CO2 capture: Principle, advances, and challenges

Nonaqueous amine-based absorbents for energy efficient CO2 capture

Phase-changing solution PZ/DMF for efficient CO2 capture and low corrosiveness to carbon steel

Solvent regeneration for the conventional aqueous amine-based CO2 capture is very energy intensive. Development of phase-changing absorbents is an attractive solution for low energy consumption. In...

Low-Energy-Consumption CO2 Capture by Liquid–Solid Phase Change Absorption Using Water-Lean Blends of Amino Acid Salts and 2-Alkoxyethanols

From hybrid solvents to water-lean solvents – A critical and historical review

Conventional amine scrubbing systems for carbon dioxide capture require a large amount of energy to regenerate the absorbent. Theoretically, if CO2-captured product can be separated from the liquid counterpart, and only this product need to be heated for desorption, the energy efficiency for CO2 capture can be improved greatly. In the present work, diethylenetriamine (DETA) dissolved in ethanol, diethylene glycol dimethyl ether, N-methyl-pyrrolidone, or dimethyl carbonate can absorb CO2 to result in liquid–solid phase-change in addition to making the reaction to achieve its stoichiometric maximum. The results show that the different organic solvents have no influence on the formation of precipitate. Single-crystal structure analysis indicates a DETA–carbamate is formed with equimolar CO2 absorption. The absorption–desorption cycles using microwave heating shows that the system has a relatively stable cycling performance.

Liquid–Solid Phase-Change Behavior of Diethylenetriamine in Nonaqueous Systems for Carbon Dioxide Absorption

The invention discloses a preparation method and application of a core-shell material catalyst, and belongs to the technical field of catalyst preparation. The method comprises the following steps that under the electrostatic effect of the surface of a catalyst core material (ammonium chloride salts) on positive and negative electrolyte, a layer of ordinary metal framework coats on the surface via static electricity, and the core-shell material catalyst is obtained through preparation. Through low-temperature roasting, the core material can release ammonia gas for further forming a target product catalyst. The catalyst can be used in a system for producing diphenyl carbonate through transesterification of urea (or amino methyl carbonate) and phenol; the catalyst and the ammonia gas produced by the system can achieve a coordination adsorption effect so as to push the reaction to rightwards move; the yield of the diplenyl ester product reaches higher than 90 percent; the catalyst can still maintain a good catalysis effect after being repeatedly used for five times; in addition, the separation and the recovery are easy; the selectivity is high.

Preparation method and application of core-shell material catalyst

The catalysis effect of transition metal chlorides (TMC) for the synthesis of diethyl carbonate (DEC) from ethyl carbamate and ethanol was investigated in a batch reactor. Their activities were arranged as follows: MnCl2 > CoCl2 > ZnCl2 > CdCl2 > NiCl2, the corresponding yields of DEC were 11, 6.5, 3.7, 2.8, and 2.4 % at 190 °C in 12 h. The highest decomposition temperatures of their diammine complexes were sorted as follows: Ni(NH3)2Cl2 > Mn(NH3)2Cl2 > Co(NH3)2Cl2 > Cd(NH3)2Cl2 > Zn(NH3)2Cl2. These results indicated that the activity of TMC was not entirely determined by its ammonia capture ability, which is characterized by the decomposition temperature of diammine complex. On the other hand, the diammine TMC still showed activity for the synthesis of DEC. Their activities were a little lower than those of the corresponding TMC but the sequence was the same to that of TMC. In the reaction process, TMC was found to be coordinated with byproduct ammonia yielded in situ to form ammine complex, in which the number of ammonia molecule would change with the reaction conditions. These results indicated that the catalysis ability of TMC was the crucial influence factor for DEC yield and the reaction coupling ability of it was also benefit for DEC synthesis.

Catalysis effect and conversion process of transition metal chlorides in the synthesis of diethyl carbonate from ethyl carbamate and ethanol

Keywords:core-shell structural; ZnO@4A; 4A molecular sieves; nano-zinc oxide Abstract:Core-shell structural material has received much attention, this materials are different from the symbiotic synthesized two phase molecular sieve, but has ordered core-shell structure which retains the composition characteristics of the molecular sieve and has a variety of active center and dual channel structure. This work systematically expounded the synthesizing and characterizing results of core-shell material ZnO@4A. In this article, we used guiding agent method to synthesize 4A molecular sieve particle which morphology size between 200-300nm. Experimental aging time, template agent dosage and crystallization time effecting on 4A molecular sieve synthesis were investigated. Then two-step method was used to synthesize nano-ZnO which features diameter between 400-600nm. Layer by layer poly-electrolyte method(LBL) was adopted to get ZnO@4A, XRD, SEM and Energy Disperse Spectroscopy(EDS) were carried out to give its character.

The preparation of core-shell structural ZnO@4A nano-materials

The utility model relates to a controllable water level automatic water supply's water-bath belongs to chemical reaction device technical field. The utility model discloses a depth of water graduation apparatus, vernier card, ball-cock assembly, buoyancy ball, inscription hose, nonrust steel pipe, external hose, the vernier card is connected on it to depth of water graduation apparatus, and the vernier card is used for setting for the water level of own anticipation, and the other end of vernier card is connected on the ball-cock assembly, and the buoyancy ball is connected to the other end of ball-cock assembly, and vernier card and ball-cock assembly are in fixed horizontal position, and the intermediate position of depth of water graduation apparatus has a perfect understanding nonrust steel pipe, and external hose is connected to the left end of nonrust steel pipe, and the inscription hose is connected to the right-hand member of nonrust steel pipe, the other end connection ball-cock assembly of inscription hose, the other end connection water pipe or the high flush tank of external hose. The utility model discloses simple structure, feasibility are higher, are applicable to running water or high flush tank's laboratory, easy operation, adjustable water level, automatic water supply, and labour saving and time saving can realize 24 hours unmanned continuous constant temperature heating of supervision.

Jiejing Nong

Papers

Liquid–Solid Phase-Change Behavior of Diethylenetriamine in Nonaqueous Systems for Carbon Dioxide Absorption

Preparation method and application of core-shell material catalyst

Catalysis effect and conversion process of transition metal chlorides in the synthesis of diethyl carbonate from ethyl carbamate and ethanol

The preparation of core-shell structural ZnO@4A nano-materials

Controllable water level automatic water supply's water-bath