Method for measuring content of furfural in crude aldehyde

A determination method, furfural technology, applied in the direction of phase influence characteristic measurement, etc., can solve the problems of unfavorable on-site operation in the production workshop, high detection cost, long detection cycle, etc., to solve the problems of difficult operation, accurate measurement results, and large solvent interference Effect

Inactive Publication Date: 2020-01-17
CHEM TECH ACAD OF SHANDONG PROVINCE
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of high detection cost, long detection period, and unfavorable on-site operation in the production workshop in the above-mentioned prior art, and use the refractometer that every furfural manufacturer has to establish a rapid detection of furfural content in gross aldehyde. new method of detection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take by weighing 11.6071, 11.6273, 12.2853, 11.6002, 11.6015g furfural standard product, the furfural standard product content is 99.23%, add 1.1818, 0.9895, 0.6607, 0.1250, 0g water, the furfural content that is mixed with is 90.06%, 91.45%, 94.17%, 98.17%, 99.23% furfural standard series, mixed in 55 ℃ water bath. Use a calibrated refractometer, adjust the test temperature of the refractometer to 55°C, and measure the refractive index of the furfural standard series to be 1.3628, 1.3801, 1.4323, 1.4954, and 1.5125 respectively. Take the furfural content as the abscissa and the ordinate to draw the refraction Rate-furfural content standard curve, the curve equation is y=0.0161x-0.0839, the linear correlation coefficient R 2 =0.9992, the measured refractive index of the furfural sample is 1.3855. After calculation, the furfural content in the furfural is 91.27%. Under the same sample, the liquid chromatography is used to test, and the furfural content is 91.45%, which i...

Embodiment 2

[0024] Take by weighing 11.6918, 12.1115, 11.0374, 11.9000, 11.5806g furfural standard product, the furfural standard product content is 99.23%, add 1.1947, 1.0096, 0.6868, 0.1006, 0g water, the furfural content of preparation is 90.03%, 91.59%, 94.14%, 98.40%, 99.23% furfural standard series, mixed in 40 ℃ water bath. Use a calibrated refractometer, adjust the test temperature of the refractometer to 40°C, and measure the refractive index of the furfural standard series to be 1.3778, 1.4001, 1.4255, 1.5053, and 1.5185. Take the furfural content as the abscissa and the ordinate to draw the refraction Rate-furfural content standard curve, the curve equation is y=0.0154x-0.011, linear correlation coefficient R 2 =0.9992, the measured refractive index of the gross aldehyde sample is 1.4088, and the furfural content in the gross aldehyde is calculated to be 92.19%. The same sample is tested by liquid chromatography, and the furfural content is 92.07%, which is within the allowabl...

Embodiment 3

[0026] Take by weighing 11.7226, 11.9277, 11.5946, 11.6255, 11.6073g furfural standard product, the furfural standard product content is 99.23%, add 1.1857, 1.0005, 0.5801, 0.1243, 0g water, the furfural content of being mixed with is 90.12%, 91.55%, 94.50%, 98.18%, 99.23% furfural standard series, mixed in 70 ℃ water bath. Use a calibrated refractometer, adjust the test temperature of the refractometer to 70°C, and measure the refractive index of the furfural standard series to be 1.3684, 1.3851, 1.4326, 1.4913, and 1.5065 respectively. Take the furfural content as the abscissa and the ordinate to draw the refraction Rate-furfural content standard curve, the curve equation is y=0.0154x-0.0264, linear correlation coefficient R 2 =0.9989, the measured refractive index of the gross aldehyde sample is 1.3694, and the furfural content in the gross aldehyde is calculated to be 90.64%. The same sample is tested by liquid chromatography, and the furfural content is 90.90%, which is ...

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Abstract

The invention discloses a method for measuring the content of furfural in crude aldehyde. The content of furfural in crude aldehyde is calculated by drawing a refractive index-furfural content standard curve. Because the indicator of refractive index is specified in the technical indicator of industrial furfural, and furfural manufacturers have refractive index testers, so the furfural manufacturers do not need to purchase additional expensive analytical instruments by adopting the method disclosed by the invention, thus reducing the detection cost, meanwhile, the detection method disclosed bythe invention is short in test time, and thus can be applied to the rapid detection of the content of furfural in crude aldehyde.

Description

technical field [0001] The invention relates to the technical field of furfural content detection, in particular to the detection of constant furfural content. Background technique [0002] Furfural, also known as furan formaldehyde, is an important basic organic chemical product widely used in medicine, food, daily chemical, petrochemical and other industries. At present, the domestic furfural production process uses lignocellulosic biomass such as corncobs, bagasse, cottonseed husks, oat husks, etc. as raw materials, and is prepared by catalytic hydrolysis in acidic medium. At present, the common technological process for preparing furfural in industry is as follows: raw materials and catalysts are cooked under certain conditions for a certain period of time, and the furfural generated is removed in time by introducing steam. The lower layer is a furfural-rich phase (hair aldehyde or crude furfural), which is further purified by rectification to obtain the furfural produc...

Claims

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Application Information

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IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 王瑞菲王艳刘启奎张晓霞邢伶周长海
Owner CHEM TECH ACAD OF SHANDONG PROVINCE
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