Polytetramethylene ether glycol molecular weight distribution adjustment method
A technology of polytetramethylene ether glycol and number average molecular weight is applied in the field of adjusting the molecular weight distribution of polytetramethylene ether glycol, and can solve the problems of high cost, increased equipment size, difficulty in stirring power and the like
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Embodiment 1
[0027] The THF monomer of 60kg is added in the reactor, and the phosphotungstic acid of 60kg and a small amount of water (its amount is the same as the molar number of the catalyst and the PTMG produced) are added therein. The reaction temperature of the reactor was maintained at 60°C, and THF monomer was fed constantly at a rate of 6 kg / hour. Meanwhile, by water feeder, in 12 hours, the moisture that total amount is 72ml is added in the reactor 6 times (that is, every 2 hours add the water of the amount of 12ml), stir reaction mixture in reactor simultaneously, The mixture is continuously transferred to a phase separator in order to separate the catalyst layer. Thereafter, water is recycled from the phase separator to the reactor so that the PTMG accumulates in the upper layer due to the formation of an overflow drain. After 24 hours of polymerization, the accumulated PTMG was sampled to measure the number average molecular weight and molecular weight distribution, and the r...
Embodiment 2
[0029] The THF monomer of 60kg is added in the reactor, and the phosphotungstic acid of 60kg and a small amount of water (its amount is the same as the molar number of the catalyst and the PTMG produced) are added therein. The reaction temperature of the reactor was maintained at 60°C, and THF monomer was fed constantly at a rate of 6 kg / hour. Meanwhile, by water supply, in 12 hours, the moisture that total amount is 72ml is added in the reactor 3 times (that is, every 4 hours add the water of the amount of 24ml), stir reaction mixture in reactor simultaneously, The mixture is continuously transferred to a phase separator to separate the catalyst layer. Thereafter, water is recycled from the phase separator to the reactor so that the PTMG accumulates in the upper layer due to the formation of an overflow discharge. After 24 hours of polymerization, the accumulated PTMG was sampled to measure the number average molecular weight and molecular weight distribution, and the result...
Embodiment 3
[0031]60 kg of THF monomer was added to the reactor, and 60 kg of phosphotungstic acid and a small amount of water (the amount was the same as, for example, the number of moles of the prepared PTMG) were added thereto. The reaction temperature of the reactor was maintained at 60°C, and THF monomer was fed constantly at a rate of 6 kg / hour. At the same time, through the water supply, a total amount of 72ml of water was added to the reactor in 2 pulses in 12 hours (that is, the water of 36ml was added every 6 hours). The reaction mixture was stirred such that the mixture was continuously transferred to a phase separator to separate the catalyst layer. Thereafter, water is recycled from the phase separator to the reactor so that the PTMG accumulates in the upper layer due to the formation of an overflow discharge. After 24 hours of polymerization, the accumulated PTMG was sampled to measure the number average molecular weight and molecular weight distribution, and the results we...
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