Production method of dicarboxylic acid
A technology of dicarboxylic acid and production method, applied in the directions of carboxylate preparation, oxidative preparation of carboxylic acid, chemical instruments and methods, etc., can solve the problems of easy deactivation, difficult recovery, small specific surface, etc., and achieve high lactone The effect of conversion rate, good activity stability
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Embodiment 1
[0027] Take by weighing 4.6 grams of titanium-silicon molecular sieves (produced by Hunan Jianchang Petrochemical Company, trade name HTS, analyzed by X-ray diffraction to be the titanium-silicon molecular sieve of MFI structure, there is an adsorption isotherm and a desorption isotherm between the adsorption isotherm and the desorption isotherm of the low-temperature nitrogen adsorption of this molecular sieve) Hysteresis ring, the grains are hollow grains and the radial length of the cavity part is 15-180 nanometers; the molecular sieve sample is at 25°C, P / P 0 =0.10, the benzene adsorption capacity that records under the condition of adsorption time 1 hour is 78 mg / gram) is packed in the 100ml three-necked flask, then adds magnetic stirring bar, 22.81 gram ε-caprolactone, 3.6 gram water, 6.4 gram of methanol and 23ml of 30% hydrogen peroxide, the molar ratio of ε-caprolactone to hydrogen peroxide is 1:1. The three-necked flask is placed on a temperature-controlled magnetic ...
Embodiment 2
[0029] Take by weighing 4.88 grams of titanium-silicon molecular sieves (produced by Hunan Jianchang Petrochemical Co., Ltd., brand HTS, analyzed by X-ray diffraction to be the titanium-silicon molecular sieve of MFI structure, there exists between the adsorption isotherm and the desorption isotherm of the low-temperature nitrogen adsorption of this molecular sieve) Hysteresis ring, the grains are hollow grains and the radial length of the cavity part is 15-180 nanometers; the molecular sieve sample is at 25°C, P / P 0=0.10, the benzene adsorption capacity measured under the condition of adsorption time 1 hour is 78 mg / g) is installed in the 100ml three-necked flask, then adds magnetic stirring bar, 22.81 gram ε-caprolactone, 6.4 gram water and 23ml The concentration is 30% hydrogen peroxide, and the molar ratio of ε-caprolactone to hydrogen peroxide is 1:1. The three-necked flask is placed on a temperature-controlled magnetic stirrer, and the upper part of the three-necked flas...
Embodiment 3
[0031] Take by weighing 2.65 grams of titanium-silicon molecular sieves (produced by Hunan Jianchang Petrochemical Company, brand HTS, analyzed by X-ray diffraction to be the titanium-silicon molecular sieve of MFI structure, there is an adsorption isotherm and a desorption isotherm between the adsorption isotherm and the desorption isotherm of the low-temperature nitrogen adsorption of this molecular sieve) Hysteresis ring, the grains are hollow grains and the radial length of the cavity part is 15-180 nanometers; the molecular sieve sample is at 25°C, P / P 0 =0.10, the benzene adsorption capacity that records under the condition of adsorption time 1 hour is 78 mg / gram) is packed in the 100ml three-necked flask, then adds magnetic stirring bar, 11.41 gram epsilon-caprolactone, 9.2 gram acetone, 20 Gram acetic acid and 46ml concentration are 30% hydrogen peroxide, and the molar ratio of ε-caprolactone and hydrogen peroxide is 1: 4 this moment. The three-necked flask is placed o...
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