Method for synthesizing polyaspartic acid by maleic anhydride and ammonia gas
A technology of polyaspartic acid and maleic anhydride, which is applied in the field of high molecular polymer preparation, can solve the problems of high viscosity of intermediates and low utilization rate of ammonia, and achieve the effects of low production cost and avoiding waste gas
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Embodiment 1
[0030] 1) Put 97kg of maleic anhydride into the closed reactor connected with the tail gas absorption device, close the tail gas absorption device, start stirring, heat up to make it melt, and after the maleic anhydride is completely melted, slowly feed it into the reactor 17kg of ammonia gas, control the pressure in the reactor to 0.15Mpa~0.2Mpa, control the reaction temperature at 100°C to carry out the substitution reaction, stop the substitution reaction when the pressure in the reactor no longer drops, and open the tail gas absorption device to absorb the remaining gas; Adding 15kg mass fraction is 30% sodium hydroxide solution for neutralization reaction, controlling the reaction temperature to be 100°C, and after reacting for 0.5 hours, a mixture of sodium maleamate and ammonium maleamate is obtained;
[0031] 2) The temperature of the product in step 1) was directly raised to 200°C, and the polycondensation reaction was carried out under stirring. The polyco...
Embodiment 2
[0035] 1) Put 97kg of maleic anhydride into the closed reactor connected with the tail gas absorption device, close the tail gas absorption device, start stirring, heat up to make it melt, and after the maleic anhydride is completely melted, slowly feed it into the reactor 17kg of ammonia gas, control the pressure in the reactor to 0.15Mpa~0.2Mpa, control the reaction temperature at 100°C to carry out the substitution reaction, stop the substitution reaction when the pressure in the reactor no longer drops, and open the tail gas absorption device to absorb the remaining gas; Adding 33kg mass fraction is 30% sodium hydroxide solution to carry out neutralization reaction, control reaction temperature is 100 ℃, after reacting for 1 hour, obtain the mixture of sodium maleamate and ammonium maleamate;
[0036] 2) The temperature of the product in step 1) is directly raised to 220°C, and the polycondensation reaction is carried out under stirring. The polycondensation reaction t...
Embodiment 3
[0040] 1) Put 97kg of maleic anhydride into the closed reactor connected with the tail gas absorption device, close the tail gas absorption device, start stirring, heat up to make it melt, and after the maleic anhydride is completely melted, slowly feed it into the reactor 17kg of ammonia gas, control the pressure in the reactor to 0.15Mpa~0.2Mpa, control the reaction temperature at 100°C to carry out the substitution reaction, stop the substitution reaction when the pressure in the reactor no longer drops, and open the tail gas absorption device to absorb the remaining gas; Adding 48kg mass fraction is 30% sodium hydroxide solution to carry out neutralization reaction, control reaction temperature is 100 ℃, after reacting for 1 hour, obtain the mixture of sodium maleamate and ammonium maleamate;
[0041] 2) The temperature of the product in step 1) was directly raised to 240°C, and the polycondensation reaction was carried out under stirring. The polycondensation reaction time...
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