Synthesis process of nylon MXD6
A synthesis process, nylon technology, applied in the field of nylon MXD6 synthesis process, can solve the problems of high melting point and poor processing performance
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Embodiment 1
[0049] A kind of synthetic technique of nylon MXD6, comprises the following steps:
[0050] (1) Add 5.18 kg (35.4 mol) of adipic acid and 10.40 kg of deionized water (as a solvent) into a 50L salt-forming kettle, start stirring, and add 5.16 kg (37.9 mol) after the adipic acid is dissolved m-xylylenediamine, after replacing nitrogen for 3 times, heat up to 80°C, adjust the pH value of the solution to 7.5 by adding m-xylylenediamine, and obtain m-xylylene adipamide salt solution after reacting for 1 hour, with a total weight of 20.12 kg;
[0051] (2) Add the m-xylylene adipamide salt solution that step (1) obtains to concentrate in the concentration kettle, and the concentration temperature is set at 120° C., and when the distilled liquid is 6.66 kilograms, the salt concentration in the kettle is already After reaching 70wt%, stop the reaction, add activated carbon to the distilled liquid and filter to obtain the filtrate, which is used as the solvent in the step (1);
[0052...
Embodiment 2
[0056] A kind of synthetic technique of nylon MXD6, comprises the following steps:
[0057] (1) Add 5.18 kg (35.4 mol) of adipic acid and 10.40 kg of deionized water (as a solvent) into a 50L salt-forming kettle, start stirring, and add 4.97 kg (36.5 mol) after the adipic acid is dissolved m-xylylenediamine, after replacing nitrogen for 3 times, the temperature was raised to 80°C, and the pH value of the solution was adjusted to 7.2 by adding m-xylylenediamine, and after 2 hours of reaction, adipamide m-xylylenediamine salt solution was obtained, with a total weight of 20.55 kg;
[0058] (2) the adipyl m-xylylenediamine salt solution that step (1) obtains is added to concentrate in the concentrated still, and the concentrated temperature is set as 135 ℃, stops reaction when the salt concentration reaches 80wt% in the still, to distillation Add active carbon to the liquid and filter to obtain the filtrate, which can be reused in step (1);
[0059] (3) 5 grams of m-xylylenedia...
Embodiment 3
[0063] A kind of synthetic technique of nylon MXD6, comprises the following steps:
[0064] (1) Add 5.18 kg (35.4 mol) of adipic acid and 10.40 kg of deionized water (as a solvent) into a 50L salt-forming kettle, start stirring, and add 5.16 kg (37.9 mol) after the adipic acid is dissolved m-xylylenediamine, after replacing nitrogen for 3 times, heat up to 90°C, adjust the pH value of the solution to 7.8 by adding m-xylylenediamine, and obtain adipamide m-xylylenediamine salt solution after 1 hour of reaction, the total weight 20.12 kg;
[0065] (2) the adipyl m-xylylenediamine salt solution that step (1) obtains is added to concentrate in the concentrated still, and the concentrated temperature is set as 140 ℃, stops reaction when the salt concentration reaches 90wt% in the still, to distillation Filtrate is obtained by filtering after adding activated carbon to the liquid, which can be used as a solvent in step (1);
[0066] (3) Add the above-mentioned concentrated m-xylyl...
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