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
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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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