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Method for determining content of isopropanol in urea dewaxing device

A technology of urea dewaxing and isopropanol, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of no clear national standards, inability to provide accurate data, and a large number of samples to be analyzed, so as to achieve effective and practical determination, reduce Analyze cost and analyze the effect of short time

Inactive Publication Date: 2016-01-13
SHENYANG PARAFFIN CHEM
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

At present, there is no clear national standard for the determination of the content of isopropanol in the solution. For the determination of the content of isopropanol in the solution with only isopropanol and no other organic and reducing substances, the method of measuring COD value can be used to indirectly calculate isopropanol content, such as the potassium dichromate method, which is to add the sample to the excess potassium dichromate solution, boil for several hours to completely oxidize the isopropanol into water, and then use the calibrated ferrous sulfate solution or sulfuric acid to Titration of residual potassium dichromate with ferrous ammonium solution takes a long time, complicated operation and small analysis range, which cannot meet the requirements of large number of samples to be analyzed in actual production, rapid analysis, and timely upload of data, and cannot be provided in time for device production. accurate data

Method used

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  • Method for determining content of isopropanol in urea dewaxing device
  • Method for determining content of isopropanol in urea dewaxing device
  • Method for determining content of isopropanol in urea dewaxing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] First of all, the determination of sample collection and sampling points:

[0076] Starting at 0:00 every day, samples are collected and analyzed every 4 hours; in order to ensure the representativeness of the samples, all samples must be collected within 15 minutes, and samples are taken in 250ml glass sampling bottles. Such as Figure 8 The sampling locations for each sample shown are as follows:

[0077] Urine: Urine feed pump, pump outlet ( Figure 8 Urine sampling points in );

[0078] 96 Alcohol: 96 Alcohol Cooler, Heat Exchanger Outlet Guide ( Figure 8 96 alcohol sampling points in the middle);

[0079] 80 Alcohol: 80 Alcohol intermediate tank, pumping outlet to guide shower ( Figure 8 80 alcohol sampling points in);

[0080] Dilute alcohol water: Dilute alcohol water feed pump, outlet guide ( Figure 8 dilute alcohol water sampling point);

[0081] Dewaxed oil: dewaxed oil feed pump, outlet guide ( Figure 8 dewaxed oil sampling point in the sample); ...

example 2

[0110] Change the inlet temperature to 220°C, and other conditions are the same as Example 1, and the results are listed in the "Example Result Comparison Table".

example 3

[0112] Change the detector temperature to 300°C, and other conditions are the same as Example 1, and the results are listed in the "Example Result Comparison Table".

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Abstract

A method for determining content of isopropanol in urea dewaxing device is suitable for determining a sample with the isopropanol content of 2-100% in a urea dewaxing device. The detection method comprises the following steps: accurately weighing the sample and an internal standard substance under convenient selected working conditions, adopting a gas chromatograph provided with a thermal conductivity detector, weighing a certain volume of a mixed sample, injecting the weighed mixed sample into a chromatographic column, separating, and measuring the content of isopropanol in an unknown sample according to the known mass of ethanol and measured peak areas of ethanol and isopropanol. The internal standard substance ethanol selected in the method has similar physical and chemical properties with isopropanol to be determined, and ethanol and isopropanol in the sample can be fully separated under chromatographic conditions at just right intervals, so the isopropanol content can be accurately determined, and the analysis time can be controlled. Analysis data is timely provided for the device in practical production, and sample introduction amount increase and decrease, closed cycle, water washing and tower pressure changing can be carried out by comparing the analysis data with parameter control indexes to guarantee stable running of production.

Description

technical field [0001] The invention relates to the technical field of component content detection in petrochemical products, in particular to a method for measuring isopropanol content in a urea dewaxing device. The invention is applicable to the determination of samples whose isopropanol content is between 2% and 100% in a urea dewaxing device. Background technique [0002] The urea dewaxing unit uses Daqing atmospheric pressure second-line distillate as raw material. After urea dewaxing, high-purity paraffin products can be obtained. The isopropanol aqueous urea dewaxing process is to use the characteristic that urea molecules can undergo complex reaction with normal alkanes under certain conditions to extract the wax in the diesel fraction and lower the freezing point of the oil. The complex can be decomposed by heating and can be reduced to normal alkanes and urine. Isopropanol is one of the main components of the complexing agent in the dewaxing process and plays an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 田爽高晶岩崔玉冲文丽杰于杰张昕华邢建新佟琦宇
Owner SHENYANG PARAFFIN CHEM
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