摘要:

Cobalt sulphide catalyst prepared via a new method involving the precipitation reaction between cobaltous acetate and ammonium sulphide solutions has been shown to be favourably active for the catalytic decomposition of H2S when compared with data for other transition metal sulphides.

ISSN:0098-6445    

DOI:10.1080/00986449608936442

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The absorption of a gas in liquid filled porous particles in gas-solid reactors was studied both theoretically and experimentally. In the theoretical study a micro mode!, describing mass transport accompanied with reaction inside the particles, was implemented in the macro balance for several asymptotic operation modes. The theoretical study showed that the gas separation can be carried out very efficiently with the liquid filled porous particles, especially for the countercurrent mode of operation. The results of the simulations for the removal of H2S from a gas stream also containing CO2showed that a very selective absorption process can be obtained. For these kind of selective absorption processes the simulations showed that the residence time of the particles is a crucial parameter

ISSN:0098-6445    

DOI:10.1080/00986449608936443

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Details on the design and construction of a high-pressure, temperature controlled sapphire cell are reported for the study of clathrate hydrate nucleation under pristine experimental conditions. Laser light scattering optics and detection equipment have been successfully integrated with the apparatus to monitor the development of the incipient phase and characterize the early stages of hydrate growth. Experiments on the scattering behaviour of the nucleation process have revealed that within the detection limit of the technique, the hydrate phase was not present in sufficient size or number prior to its catastrophic appearance. A series of investigations to identify nucleation process variables have verified the existence of an aqueous phase thermal history. In addition, the efficacy of perturbations on inducing hydrate formation has been established. These studies are consistent with literature on the formation of ice and the crystallization of inorganic salts and sugars. The data support an argument that the nucleation process is non-deterministic due to a probabilistic element within the nucleation mechanism

ISSN:0098-6445    

DOI:10.1080/00986449608936444

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Weight loss tests were performed to investigate the corrosivity of a new absorbent, 2-amino-2-methyl-l-propanol (AMP) saturated with pure CO2and Mixture of CO2and air on carbon steel under boiling conditions. The corrosion data were compared with those of a conventional amine, monoethanolamine (MEA), tested under the same conditions. The results indicated that corrosion rates in the AMP system were generally lower than those in the M EA system, probably due to differences in characteristics of the corrosion products in each of the absorbents. Corrosivity in the AMP system tended to stabilize when the amine concentration reached 5 kmol/m3while corrosion rates in the MEA system were directly proportional to amine concentrations. Furthermore, it was observed that a small amount of O2seemed to expedite severe corrosion

ISSN:0098-6445    

DOI:10.1080/00986449608936445

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A new concept of using multiple apparent constant parameters plus sensitivity analysis was developed based on a modified Kent-Eisenberg model for predicting the carbon dioxide (CO2) solubility in aqueous 2-amino-2-methyl-l-propanol (AMP) solutions. Three apparent constants of amine protonation, dissociation and physical dissolution of C02 were identified to be the most significant parameters in the system. Previously published data were used to determine these three constants utilizing a nonlinear least-squares technique. The predictions from the present model agree well with all 121 experimental measurements available in the open literature

ISSN:0098-6445    

DOI:10.1080/00986449608936446

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The solubility of nitrous oxide (N2O) in aqueous solutions of 0-50 mass % methyldiethanolamine (MDEA), 0-30 mass % diethanolamine (DEA), and 50 mass % total amine with DEA/MDEA weight ratios of 0.04413-0.5883 was measured over the temperature range 293-353 K and at N2O partial pressures near atmospheric. The solubility data from this work were found to be in fair agreement with the literature where data were available. The N2O solubility data for the aqueous MDEA and aqueous DEA solutions were fitted using the extended scaled-particle model proposed by Li and Mather (1994) (which was based on the work of Hu et al. (1985)). The parameter estimates obtained from these fits were then used to predict the N2O solubility in the aqueous DEA + MDEA solutions. The model predictions were found to agree with the experimental data with an average deviation of 3.4%

ISSN:0098-6445    

DOI:10.1080/00986449608936447

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The model of Deshmukh and Mather (1981) is a popular method for correlating and predicting the vapor-liquid equilibria in systems containing acid gases (hydrogen sulfide and carbon dioxide) and aqueous solutions of alkanolamines. The model includes phase equilibrium between an aqueous liquid and a gas as well as chemical equilibrium in the aqueous phase. A recent review by Weiland et al. (1993) demonstrated the accuracy of the correlation. Presented here is a model based on that of Deshmukh and Mather (1981) for calculating the distribution of acid gases between two liquid phases - an aqueous phase and a non-aqueous liquid (typically a propane- or butane-rich liquid)

ISSN:0098-6445    

DOI:10.1080/00986449608936448

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The use of amine blends to harness the desirable qualities of the constituent amines in order to reduce operating costs and/or improve product quality is becoming increasingly attractive to operators of alkanolamine-basedgas sweetening units. A number of parameters, all of which have economic implications, can be used to monitor the performance of amine blends. These include absorption rates, equilibrium solubility, corrosion, solution degradation and reclamation. This paper evaluates the influence of blend composition and components on some of the above parameters for aqueous blends of MDEA + MEA, MDEA + DEA and MDEA + DIPA

ISSN:0098-6445    

DOI:10.1080/00986449608936449

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Alkanolamine solutions are frequently used as solvent for the removal of acid compounds from industrial gases (Kohl and Riesenfeld, 1979). Depending on the process requirements, e.g., selective removal of H2S, CO2-bulk removal, several options for alkanolamine based treating solvents with varying compositions of the solution have been proposed.

ISSN:0098-6445    

DOI:10.1080/00986449608936450

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The foaming tendency of a 30 weight % solution of diethanolamine (DEA) in distilled water was measured over a temperature range of 20-85°C and a pressure range of 1-3 MPa in the presense of a number of contaminants including carboxylic acids, oils, 1-4 bis (2-hydroxyethyl) piperazine (HEP), methanol, iron sulphide, silicone antifoam, etc. The measurements were conducted using a Jerguson high pressure sight glass contained in an air bath. Foaming was measured at gas rates up to 7.5 standard m3/d using air, nitrogen, carbon dioxide, and ethane. One notable observation was that the addition of most of the contaminants commonly identified as foam promoters did not create a foaming system with a clean 30% DEA solution. In fact, the only solutes that produced significant foaming were the carboxylic acids as noted previously in the literature by Pauley et al. (1989). The addition of contaminants to a foaming system did increase foam heights and stability substantially and results are presented for methanol and HEP addition to a foaming system of DEA-carboxylic acid. The effects of temperature, pressure, and gas flow rates on foam heights and foam break times were measured for a number of systems. Foaming was increased by a higher temperature and by higher pressure and was much more pronounced when carbon dioxide or ethane gases were used

ISSN:0098-6445    

DOI:10.1080/00986449608936451

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor