Method for testing acetic acid distillation tower top composition by using gas chromatographic method

A gas chromatography and gas chromatography technology, applied in the field of gas chromatography to determine the composition of acetic acid distillation tower overhead, can solve the problems of time-consuming, labor-intensive and accuracy, and achieve the effects of saving time, improving accuracy and timeliness

Inactive Publication Date: 2015-05-27
SHAANXI YANCHANG PETROLEUM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems in the prior art that three different methods are required to measure the composition of the acetic acid rectification tower overhead sample respectively, which is time-consuming and laborious and has low accuracy.

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  • Method for testing acetic acid distillation tower top composition by using gas chromatographic method

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Embodiment 1

[0024] In order to overcome the problem in the prior art that three different methods are required to measure the component content of the overhead sample of acetic acid distillation, which is time-consuming and laborious and has low accuracy, this embodiment provides a gas chromatographic method The method for measuring the composition of acetic acid rectification overhead product may further comprise the steps:

[0025] 1) Preparation of detection instruments and reagents; prepare one gas chromatograph, one volumetric flask, one electronic balance, a certain amount of water, acetic acid reagent, sec-butyl acetate reagent, standard substance and sample solution of acetic acid distillation overhead , the standard substance is selected according to the type of detector in the selected gas chromatograph, general thermal conductivity detector (TCD detector) selects benzene for use, and hydrogen flame detector selects n-heptane for use;

[0026] 2) configure the standard solution;...

Embodiment 2

[0031] The present embodiment provides a method for measuring the composition of acetic acid rectification overhead by gas chromatography, comprising the following steps:

[0032] 1) Preparation of detection instruments and reagents; prepare one Agilent 7820A gas chromatograph, one 100ml volumetric flask, one electronic balance, a certain amount of water, acetic acid reagent, sec-butyl acetate reagent, standard substance and the top of the acetic acid distillation tower substance sample solution, the water used is high-purity water (purity 99.99%, the content of impurities is less than 0.1mg / L, and the salt content is below 0.3mg / L), the purity of the acetic acid reagent used is chromatographically pure grade, and the sec-butyl acetate used The purity of the reagent is chromatographically pure grade, the standard substance used is benzene, and the purity of the standard substance used is chromatographically pure grade. The detector in the gas chromatograph adopts a TCD detecto...

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Abstract

The invention belongs to the technical field of chemical engineering analysis, and in particular provides a method for testing acetic acid distillation tower top composition by using a gas chromatographic method. The method comprises the following steps: (1) preparing a detection instrument and a reagent; (2) configuring standard solutions; (3) testing relative correction factors; and (4) testing samples. According to the method, reasonable gas phase chromatography configuration is chosen, and a proper chromatography condition is set, and three analysis projects of the samples are analyzed at a time according to the difference of water, acetic acid and sec-butyl acetate in the samples; moreover, according to the method, time-saving and labor-saving effects are achieved and the accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, and in particular relates to a method for measuring the composition of acetic acid rectification tower overhead by gas chromatography. Background technique [0002] Second-butyl acetate is a good organic solvent, which is widely used in nitrocellulose, paint, artificial leather, medicine, ink and plastic industries. At present, there are two main production methods of sec-butyl acetate: alcohol esterification and acetic acid-olefin addition. [0003] The alcohol esterification method adopts a batch-type tank reaction, and uses sulfuric acid as a catalyst to catalyze the esterification reaction of acetic acid and butanol. Because water is produced simultaneously during the esterification of acetic acid and butanol, and water will not only cause the reverse reaction of the esterification reaction (ester hydrolysis reaction), but also cause separation difficulties due to the azeotropy of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 张勇郝完晓净洁飞刘洪波杨智军张飞贾军赵勇
Owner SHAANXI YANCHANG PETROLEUM GRP
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