公开(公告)号：US10041926B2

公开(公告)日：2018-08-07

申请号：US15648028

申请日：2017-07-12

申请人： Chevron U.S.A. Inc.

发明人： Toni Zhang Miao ,  Rachel Mohler ,  Deyuan Kong ,  Ajit Ramachandra Pradhan ,  Michael E. Moir ,  Thomas Hoelen

IPC分类号： G01N33/24 ,  G01N21/3563 ,  G01N21/552 ,  G01N30/02

摘要： Disclosed is a method for generating a site specific model for predicting TPH concentration in soil. The method includes dividing a plurality of soil samples taken from a field site into two sets of samples. One set is analyzed using GC-FID, and the other set is analyzed using a handheld FTIR spectrometer with an ATR window to obtain FTIR-ATR absorbance data. Partial least squares regression analysis is used to correlate the GC-FID TPH concentration data with the absorbance data to generate a calibration model. The model is validated with soil samples having unknown TPH concentration. The model is used to predict the TPH concentration of soil samples taken from the field site analyzed using the handheld Fourier transform-infrared spectrometer to obtain FTIR-ATR absorbance data for the soil samples. During all absorbance measurements, each of the soil samples has a moisture content of 1 to 30 wt % and each sample is pressed against the ATR window with sufficient pressure to ensure intimate contact between the sample and the window.

公开(公告)号：US20190169512A1

公开(公告)日：2019-06-06

申请号：US16272725

申请日：2019-02-11

申请人： Chevron U.S.A. Inc.

发明人： Estrella Rogel ,  Cesar Ovalles ,  Michael E. Moir

IPC分类号： C10G75/00 ,  G06Q99/00

摘要： A method for determining asphaltene stability in a hydrocarbon-containing material having solvated asphaltenes therein is disclosed. The method involves the steps of: (a) precipitating an amount of the asphaltenes from a liquid sample of the hydrocarbon-containing material with an alkane mobile phase solvent in a column; (b) dissolving a first amount and a second amount of the precipitated asphaltenes by gradually and continuously changing the alkane mobile phase solvent to a final mobile phase solvent having a solubility parameter at least 1 MPa0.5 higher than the alkane mobile phase solvent; (c) monitoring the concentration of eluted fractions from the column; (d) creating a solubility profile of the dissolved asphaltenes in the hydrocarbon-containing material; and (e) determining one or more asphaltene stability parameters of the hydrocarbon-containing material.

公开(公告)号：US20180017540A1

公开(公告)日：2018-01-18

申请号：US15648028

申请日：2017-07-12

申请人： Chevron U.S.A. Inc.

发明人： Toni Zhang Miao ,  Rachel Mohler ,  Deyuan Kong ,  Ajit Ramachandra Pradhan ,  Michael E. Moir ,  Thomas Hoelen

IPC分类号： G01N33/24 ,  G01N21/3563 ,  G01N21/552 ,  G01N30/02

CPC分类号： G01N33/241 ,  G01N21/3563 ,  G01N21/552 ,  G01N30/8693 ,  G01N2021/3595 ,  G01N2030/025 ,  G01N2030/8854 ,  G01N2201/0221 ,  G01N2201/129

摘要： Disclosed is a method for generating a site specific model for predicting TPH concentration in soil. The method includes dividing a plurality of soil samples taken from a field site into two sets of samples. One set is analyzed using GC-FID, and the other set is analyzed using a handheld FTIR spectrometer with an ATR window to obtain FTIR-ATR absorbance data. Partial least squares regression analysis is used to correlate the GC-FID TPH concentration data with the absorbance data to generate a calibration model. The model is validated with soil samples having unknown TPH concentration. The model is used to predict the TPH concentration of soil samples taken from the field site analyzed using the handheld Fourier transform-infrared spectrometer to obtain FTIR-ATR absorbance data for the soil samples. During all absorbance measurements, each of the soil samples has a moisture content of 1 to 30 wt % and each sample is pressed against the ATR window with sufficient pressure to ensure intimate contact between the sample and the window.