Addition of the sulfhydryl group (SH) to the PPR78 model: Estimation of missing group-interaction parameters for systems containing mercaptans and carbon dioxide or nitrogen or methane, from newly published data

2012 ◽  
Vol 334 ◽  
pp. 197-203 ◽  
Author(s):  
Romain Privat ◽  
Jean-Noël Jaubert
Keyword(s):  
Carbon Dioxide ◽  
Group Interaction ◽  
Sulfhydryl Group ◽  
Interaction Parameters ◽  
Published Data ◽  
Model Estimation

New Group-Interaction Parameters of the UNIFAC Model:  Aromatic Methoxyl Binaries

2001 ◽  
Vol 40 (7) ◽  
pp. 1740-1747 ◽  
Author(s):  
Shou-Ming Hwang ◽  
Ming-Jer Lee ◽  
Ho-mu Lin
Keyword(s):  
Group Interaction ◽  
Interaction Parameters ◽  
Unifac Model

DISQUAC and UNIFAC group interaction parameters for chloroalkanes

1997 ◽  
Vol 132 (1-2) ◽  
pp. 15-20 ◽  
Author(s):  
Omar Dahmani ◽  
Ivan Wichterle ◽  
Ahmed Ait-Kaci
Keyword(s):  
Group Interaction ◽  
Interaction Parameters

A method for prediction of UNIFAC group interaction parameters

AIChE Journal ◽  
2007 ◽  
Vol 53 (6) ◽  
pp. 1620-1632 ◽  
Author(s):  
Hugo Edson Gonzàlez ◽  
Jens Abildskov ◽  
Rafiqul Gani ◽  
Pascal Rousseaux ◽  
Brice Le Bert
Keyword(s):  
Group Interaction ◽  
Interaction Parameters

Automated Detection of Gastric Luminal Partial Pressure of Carbon Dioxide during Cardiovascular Surgery Using the Tonocap

2000 ◽  
Vol 92 (1) ◽  
pp. 38-38 ◽  
Author(s):  
Elliott Bennett-Guerrero ◽  
Michael H. Panah ◽  
Carol A. Bodian ◽  
Blessy J. Methikalam ◽  
John R. Alfarone ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Postoperative Complication ◽  
Artery Bypass ◽  
Bypass Graft ◽  
Automated System ◽  
Hospital Death ◽  
Published Data ◽  
Arterial Partial Pressure ◽  
Hemodynamic Variables

Background A new automated system of air tonometry (Tonocap; Datex Ohmeda, Helsinki, Finland) allows for frequent (every 15 min) measurement of gastric luminal partial pressure of carbon dioxide. Its use has not been described in cardiac surgical patients. Methods One hundred patients undergoing coronary artery bypass graft or cardiac valve surgery were enrolled in a prospective cohort study. After anesthetic induction and insertion of a TRIP NGS Catheter (Datex Ohmeda), measurements of gastric luminal partial pressure of carbon dioxide were obtained using the Tonocap, and gastric mucosal pH (pHi) was calculated. The main outcome measure was postoperative complication, defined as either in-hospital death or prolonged postoperative hospitalization (> 14 days). Results Four patients (4%) died, all of multiple-system organ failure, one each on postoperative days 9, 26, 46, and 121. Postoperative complication occurred in 18 patients (18%), all of whom exhibited persistent dysfunction of at least one organ system. Perioperatively, an abnormal pHi (< 7.32) and gastric luminal minus arterial partial pressure of carbon dioxide gap (> 8 mmHg) occurred in 66% and 70% of patients, respectively. Predictors of postoperative complication included postoperative pHi (P = 0.001), gastric luminal partial pressure of carbon dioxide (P = 0.022), and gastric luminal minus arterial partial pressure of carbon dioxide gap (P = 0.013). In contrast, arterial base excess (P > 0.4) and routinely measured hemodynamic variables (e.g., heart rate, blood pressure) were either less predictive compared with Tonocap-derived variables or not predictive. Conclusions Despite a low mortality rate, patients undergoing cardiac surgery exhibited high incidences of prolonged hospitalization and postoperative morbidity. The Tonocap was easy to use, particularly compared with saline tonometry. Several Tonocap-derived variables were predictive of postoperative complications consistent with previously published data using saline tonometry.

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