公开(公告)号：US20180017540A1

公开(公告)日：2018-01-18

申请号：US15648028

申请日：2017-07-12

Applicant: Chevron U.S.A. Inc.

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

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

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

Abstract: 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：US10684219B2

公开(公告)日：2020-06-16

申请号：US16175156

申请日：2018-10-30

Applicant: Chevron U.S.A. Inc.

Inventor： Toni Zhang Miao ,  John Bryan Trenery, Jr. ,  Deyuan Kong ,  Roopa Kamath ,  Robert Neil Trotter ,  Cory James McDaniel

IPC: G01N33/24 ,  G01N21/359

Abstract: Hydrocarbons concentrations are determined in drilling cuttings samples by generating a model for predicting hydrocarbons concentrations. Methods include dividing multiple samples removed from drilling fluid into two one set analyzed using a retort, and another set analyzed using a handheld NIR spectrometer to obtain NIR diffuse reflectance data. PLS analysis is used to correlate the retort data with the diffuse reflectance data to generate a calibration model. The model is validated with samples having unknown hydrocarbons concentration. The model is used to predict the hydrocarbons concentration for samples removed from drilling fluid taken from the rig site using the spectrometer to obtain diffuse reflectance data. During measurements, each sample contains 0.1 to 10 wt % moisture and each sample is in a clear container pressed against the spectrometer window such that the IR source from the handheld device can pass to the drilled solids sample within the clear container without opening the clear container.

公开(公告)号：US10113963B1

公开(公告)日：2018-10-30

申请号：US16018143

申请日：2018-06-26

Applicant: Chevron U.S.A. Inc.

Inventor： Huping Luo ,  Hye-Kyung Cho Timken ,  Toni Zhang Miao ,  Howard Steven Lacheen ,  Bi-Zeng Zhan

IPC: G01J3/00 ,  G01N21/552 ,  G01N21/3577 ,  G01N1/34 ,  G01N21/15 ,  G01N21/35

Abstract: An integrated system for monitoring a chemical concentration in an ionic liquid, comprising: a. an online FTIR instrument with an ATR window; b. a sample conditioning station that removes light hydrocarbons and produces a degassed ionic liquid that is analyzed by FTIR; and c. a solvent flushing system that flows solvent across the ATR window. Also, a process for monitoring the chemical concentration, comprising: a. degassing the ionic liquid in the sample conditioning station; b. passing the degassed ionic liquid over an ATR window; c. periodically redirecting a flow of the degassed ionic liquid via a bypass line or an on-off valve that isolates the ATR window from the process unit that elutes the ionic liquid; and d. flowing a solvent and a purging gas over the ATR window during the periodically redirecting step c); and e. resuming the passing of the degassed ionic liquid over the ATR window.

公开(公告)号：US11621059B2

公开(公告)日：2023-04-04

申请号：US17325310

申请日：2021-05-20

Applicant: CHEVRON U.S.A. INC.

Inventor： Toni Zhang Miao ,  Huping Luo ,  Hye-Kyung Cho Timken ,  Eddy Lee ,  Bong-Kyu Chang

IPC: G16C20/70 ,  G16C10/00 ,  G16C20/30 ,  C07C2/76 ,  G01N21/3577 ,  G01N33/28 ,  C07C2/66 ,  C07C2/64 ,  G01N21/35 ,  C07C2/68 ,  C07C2/70

Abstract: A method is provided for predicting conjunct polymer concentration in spent ionic liquid during a continuous hydrocarbon conversion process.

公开(公告)号：US10094778B1

公开(公告)日：2018-10-09

申请号：US15612648

申请日：2017-06-02

Applicant: Chevron U.S.A. Inc.

Inventor： Huping Luo ,  Hye-Kyung Cho Timken ,  Toni Zhang Miao ,  Howard Steven Lacheen ,  Bi-Zeng Zhan

IPC: G01J3/00 ,  G01N21/552 ,  G01N21/3577 ,  G01N21/15 ,  G01N1/34 ,  G01N21/35

Abstract: An integrated system for monitoring a chemical concentration in an ionic liquid, comprising: a. an online FTIR instrument with an ATR window; b. a sample conditioning station that removes light hydrocarbons and produces a degassed ionic liquid that is analyzed by FTIR; and c. a solvent flushing system that flows solvent across the ATR window. Also, a process for monitoring the chemical concentration, comprising: a. degassing the ionic liquid in the sample conditioning station; b. passing the degassed ionic liquid over an ATR window; c. periodically redirecting a flow of the degassed ionic liquid via a bypass line or an on-off valve that isolates the ATR window from the process unit that elutes the ionic liquid; and d. flowing a solvent and a purging gas over the ATR window during the periodically redirecting step c); and e. resuming the passing of the degassed ionic liquid over the ATR window.

公开(公告)号：US10041926B2

公开(公告)日：2018-08-07

申请号：US15648028

申请日：2017-07-12

Applicant: Chevron U.S.A. Inc.

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

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

Abstract: 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.