Pentamethylenediamine succinate and crystal thereof
A technology of pentamethylenediamine succinate and succinic acid, which is applied in the preparation of carboxylate, carboxylate, and organic compounds, etc., which can solve the problem of easy coalescence of oil precipitation, difficulty in obtaining high-quality crystals, and the impact of Questions about the purity of pentamethylenediamine itself
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Embodiment 1
[0074] Add 15.00 g of pentamethylenediamine into 100 mL of ethanol aqueous solution with a volume fraction of 90%, and fully stir to form an aqueous solution of pentamethylenediamine in ethanol. Add 15.00g of succinic acid solid to 350mL of 95% ethanol aqueous solution by volume fraction to form succinic acid ethanol aqueous solution, then mix the two in a 500mL crystallizer, keep stirring at 50°C for 2h, and then rapidly cool down To 10°C, add 0.5g seed crystal, and keep stirring for 48h, a white crystal substance appears, put it into the tank, filter it with suction, wash the solid with 100mL methanol, then dry the solid in vacuum for 10h, and keep the temperature at 45-60°C to get pentamethylenediamine Succinate crystalline powder, the thermogravimetric analysis spectrum of the product is as follows Figure 5 , Figure 6 Shown: The DSC spectrum only has an endothermic peak at 151.69°C, and the TG spectrum shows a weightless step at 151.69°C, indicating that the product beg...
Embodiment 2
[0076] Add 20.00 g of pentamethylenediamine into 100 g of acetone and stir well to form a pentamethylenediamine acetone solution. Dissolve 23.12g of succinic acid in 350g of methanol, drop it into the pentamethylenediamine acetone solution at a flow rate of 1mL / min at 15°C, crystallize while stirring, and monitor the pH changes in the process, and the pH is around 10.3 , add 0.15g of seed crystals, suspend feeding, after growing crystals for 1 hour, drop the remaining succinic acid methanol solution into the crystallization system at a flow rate of 0.2mL / min, and continue stirring for 2 hours after feeding is complete, and put it into the tank. Carry out the solid-liquid separation of the crystal paddle by suction filtration, then wash with 80-100mL of methanol, and then vacuum blow dry at 55°C for 8 hours to obtain pentamethylenediamine succinate crystalline powder, and its powder X-ray pattern is basically as follows: Figure 4 shown. When it is prepared as an aqueous solut...
Embodiment 3
[0078] Dissolve 45.00g of succinic acid in 500g of isopropanol to form a uniform solution of succinic acid in isopropanol, and then transfer it to a 1000mL crystallizer. 30.00 g of pentamethylenediamine was dissolved in 200 mL of 95% acetone-water (acetone accounted for 95% by volume) solution to form an aqueous solution of pentamethylenediamine-acetone. Then the aqueous solution of pentamethylenediamine acetone is dripped in the mode of 2mL / min in the isopropanol solution of succinic acid with pump, when the amount of the substance of pentamethylenediamine added is 20% of the amount of succinic acid substance, Add 0.8g seed crystals, add the remaining pentamethylenediamine acetone aqueous solution at 0.3mL / min, the whole process is carried out under stirring, the temperature is controlled at 30°C, and when the feeding is complete, the temperature is lowered to 5°C at a rate of 2°C / h. ℃, the crystallization is completed, and the tank is used for solid-liquid separation, and th...
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