Selection of optimum conditions for cracking with catalytic gas oil as recirculate

1966 ◽  
Vol 2 (3) ◽  
pp. 171-176
Author(s):  
F. I. Zeinalov ◽  
P. G. Adibekov ◽  
A. K. Avetisov ◽  
A. K. Akhmedova ◽  
T. S. Sorokina ◽  
...  
Keyword(s):  
Gas Oil ◽  
Optimum Conditions ◽  
Selection Of

Selection of the optimum conditions for determining indium by the method of amalgam polarography with accumulation

1969 ◽  
Vol 18 (10) ◽  
pp. 1959-1964
Author(s):  
I. P. Alimarin ◽  
E. N. Vinogradova ◽  
A. I. Kamenev ◽  
F. A. Abd�l' Razik
Keyword(s):  
Optimum Conditions ◽  
Selection Of

A Versatile Radioimmunoassay for the Determination of Serum Oestriol in Pregnancy

1973 ◽  
Vol 10 (1-6) ◽  
pp. 159-166 ◽  
Author(s):  
J. E. H. Stafford
Keyword(s):  
Normal Pregnancy ◽  
Optimum Conditions ◽  
Random Series ◽  
The Mean ◽  
Hydrolysis Of ◽  
Selection Of ◽  
In Pregnancy

A versatile radioimmunoassay for serum oestriol in pregnancy has been developed which requires 10 μ| of serum (for total) or 50 μ| (for unconjugated). Selection of the optimum conditions for the hydrolysis of serum oestriol conjugates, the isolation of free oestriol, the displacement of tritiated oestriol by cold oestriol and the separation of the free and bound fractions is described. Total oestriol levels doubled between weeks 34 and 38 of normal pregnancy, very little change occurring in the mean level after the 38th week of gestation. In a random series of pregnancy sera there was a significant correlation between total and unconjugated oestriol.

scholarly journals Selection of Mixed Amines in the CO2 Capture Process

2021 ◽  
Vol 7 (1) ◽  
pp. 25
Author(s):  
Pao-Chi Chen ◽  
Hsun-Huang Cho ◽  
Jyun-Hong Jhuang ◽  
Cheng-Hao Ku
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Co2 Capture ◽  
Absorption Rate ◽  
Absorption Efficiency ◽  
Optimum Conditions ◽  
Capture Process ◽  
Overall Mass Transfer Coefficient ◽  
Selection Of

In order to select the best mixed amines in the CO2 capture process, the absorption of CO2 in mixed amines was explored at the required concentrations by using monoethanolamine (MEA) as a basic solvent, mixed with diisopropanolamine (DIPA), triethanolamine (TEA), 2-amino-2-methyl-1-propanol (AMP), and piperazine (PZ). Here, a bubble column was used as the scrubber, and a continuous operation was adopted. The Taguchi method was used for the experimental design. The conditional factors included the type of mixed amine (A), the ratio of the mixed amines (B), the liquid feed flow (C), the gas-flow rate (D), and the concentration of mixed amines (E). There were four levels, respectively, and a total of 16 experiments. The absorption efficiency (EF), absorption rate (RA), overall mass transfer coefficient (KGa), and scrubbing factor (ϕ) were used as indicators and were determined in a steady-state by the mass balance and two-film models. According to the Taguchi analysis, the importance of the parameters and the optimum conditions were obtained. In terms of the absorption efficiency (EF), the absorption rate (absorption factor) (RA/ϕ), and the overall mass transfer coefficient (KGa), the order of importance is D > E > A > B > C, D > E > C > B > A, and D > E > C > A > B, respectively, and the optimum conditions are A1B4C4D3E3, A1B3C4D4E2, A4B2C3D4E4, and A1B1C1D4E1. The optimum condition validation results showed that the optimal values of EF, RA, and KGa are 100%, 30.69 × 10−4 mol/s·L, 1.540 l/s, and 0.269, respectively. With regard to the selection of mixed amine, it was found that the mixed amine (MEA + AMP) performed the best in the CO2 capture process.

Modeling of para-Xylene Synthesis via Nonselective Toluene Disproportionation

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Seyyed M. Ghoreishi ◽  
Seyyed H. Madani
Keyword(s):  
Operating Costs ◽  
Heat Of Reaction ◽  
Optimum Conditions ◽  
Effective Parameters ◽  
Toluene Disproportionation ◽  
Numerical Predictions ◽  
Para Xylene ◽  
Reactor Temperature ◽  
Feed Temperature ◽  
Selection Of

The effective parameters on p-Xylene yield in the nonselective disproportionation reaction over unmodified ZSM-5 catalyst were investigated using the validated model developed in this study. The results of this study indicate that toluene conversion and benzene/xylene ratio is increased by increasing feed temperature and reactor residence time. Even though an adiabatic operation is applied, an almost isothermal reactor temperature profile is predicted by the model due to the low heat of reaction. At different feed operating temperatures, different maximum para-Xylene yields are reached at different weight hourly space velocities (WHSV)-1. Since the model numerical predictions demonstrate that the lower feed temperature requires larger reactor to obtain the maximum p-Xylene yield, therefore, selection of optimum conditions is a function of two independent variables, feed temperature, and (WHSV)-1, and should be selected in order to minimize the objective function of total manufacturing and operating costs.

scholarly journals 584 PB 097 MICROPROPAGATION AND REGENERATION OF AN ELITE ASIAN WHITE BIRCH SELECTION

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 515e-515
Author(s):  
Jeffrey P. Schnurr ◽  
Zongming Cheng
Keyword(s):  
Cold Hardiness ◽  
Woody Plant ◽  
Leaf Explants ◽  
Optimum Conditions ◽  
Regeneration System ◽  
White Birch ◽  
Dark Treatment ◽  
Dark Green ◽  
Selection Of

A selection of Betula platyphylla, from an open pollinated population, was made for upright growth habit, cold hardiness, and a dark green canopy. A micropropagation system was developed to overcome the difficulty with conventional propagation techniques. Shoot-tip cultures were best established in 3/4 strength MS medium supplemented with 0.1 μM thiadiazuron. After 5 weeks in culture, shoots were transferred to woody plant medium (WPM) with 4.4 μM BA. The highest proliferation rate occurred at 24 C on WPM, solidified with agar, and supplemented with 2.2 μM BA. Shoots rooted in vitro and ex vitro and have been established in the field. A regeneration system has also been developed using leaves from aseptic cultures. The optimum conditions for shoot regeneration include a 2-week dark treatment before exposure to a 16-h day/8-h night cycle. Large, healthy leaf explants cultured on WPM with 20 μM BA regenerated shoots at the highest frequency. Regenerated shoots, when transferred to the micropropagation system, proliferate successfully. Currently, a transformation system for this selection is being developed.

Optimisation of the laser surface remelting process on strain criteria

2004 ◽  
Vol 120 ◽  
pp. 315-323
Author(s):  
J. Grum ◽  
R. Šturm
Keyword(s):  
Energy Input ◽  
Minimum Energy ◽  
Nodular Cast Iron ◽  
Hardened Layer ◽  
Optimum Conditions ◽  
Laser Remelting ◽  
Laser Surface Remelting ◽  
Minimum Distortion ◽  
Selection Of

This paper shows a process of selection of optimum conditions for laser remelting of nodular cast iron. The optimisation takes into account a specified depth of the hardened layer, for which an appropriate energy input is specified while taking into account the mode of guiding the laser beam. Strain criteria are given for the optimisation of the remelting process, i.e., minimum energy input at a given depth of the hardened layer, minimum distortion of the machine part and a desired variation of residual stresses across the hardened layer. Practical tests of optimisation showed the logic of adhering to the aforementioned criteria, because we can significantly influence the quality of the product at lower costs of manufacturing.

Computer-Generated Table for the Selection of Chromatographic Column Systems to Separate Organic Bases

1969 ◽  
Vol 52 (5) ◽  
pp. 999-1010
Author(s):  
Terryl J Farrell ◽  
Robert L Pecsok
Keyword(s):  
Computer Program ◽  
Chromatographic Column ◽  
Optimum Conditions ◽  
Organic Bases ◽  
Selection Of

Abstract A computer has been used to generate a set of tables describing the data of Doyle and Levine for selecting optimum conditions to separate organic bases. The tables show all compounds on the same sheet of paper, thus avoiding the use of a separate graph or overlay for each compound. The computer program can generate additional entries for other bases as the data become available.

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