Synthesis process of vitamin B5
A synthesis process and vitamin technology, applied in the field of vitamin B5 synthesis technology, can solve the problems of high pollution and high cost, and achieve the effects of protecting the environment, reducing direct emissions and rationalizing the synthesis process.
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Embodiment 1
[0014] A synthesis process of vitamin B5, comprising the following steps:
[0015] 1) Add 130 parts of glyoxylic acid and 3 parts of triethylamine into the reaction kettle, stir until the solution is yellow and transparent, then slowly add 50 parts of isobutyraldehyde dropwise, after the dropwise addition, raise the temperature to 60°C, react for 3 hours, and the reaction ends Finally, transfer the reaction materials directly to the high-pressure reaction kettle, add 200 parts of water, 0.1 part of catalyst, feed hydrogen, keep the pressure at 2-3Mpa, filter and remove the catalyst after the reaction is completed, recycle and reuse, and transfer the filtrate to the esterification kettle. Add sulfuric acid to the esterification kettle and heat up to 80°C for 3 hours. After the reaction, cool down to 45°C, extract with 100 parts of 1,2-dichloroethane, and neutralize the organic phase with 30 parts of 1% sodium carbonate aqueous solution to 6-7, separate the water layer for waste...
Embodiment 2
[0021] A synthesis process of vitamin B5, comprising the following steps:
[0022] 1) Add 140 parts of glyoxylic acid and 4 parts of triethylamine into the reaction kettle, stir until the solution is yellow, transparent and clear, then slowly add 55 parts of isobutyraldehyde dropwise, after the dropwise addition, raise the temperature to 60°C, react for 3 hours, and the reaction ends Finally, the reaction materials are directly transferred to the high-pressure reactor, and 220 parts of water and 0.2 parts of catalyst are added, and hydrogen gas is introduced to keep the pressure at 2-3Mpa. After the reaction is completed, the catalyst is filtered and removed for recycling, and the filtrate is transferred to the esterification kettle. Add sulfuric acid to the esterification kettle and raise the temperature to 80°C for 3 hours. After the reaction, cool down to 45°C, extract with 110 parts of 1,2-dichloroethane, and neutralize the organic phase with 32 parts of 1% sodium carbonate...
Embodiment 3
[0028] A synthesis process of vitamin B5, comprising the following steps:
[0029] 1) Add 145 parts of glyoxylic acid and 5 parts of triethylamine into the reaction kettle, stir until the solution is yellow, transparent and clear, start to slowly add 60 parts of isobutyraldehyde, after the dropwise addition, raise the temperature to 60°C, react for 3 hours, and the reaction ends Finally, transfer the reaction materials directly to the high-pressure reactor, add 250 parts of water, 0.3 parts of catalyst, feed hydrogen, keep the pressure at 2-3Mpa, filter and remove the catalyst after the reaction, recycle and reuse, and transfer the filtrate to the esterification kettle. Add sulfuric acid to the esterification kettle and heat up to 80°C for 3 hours. After the reaction, cool down to 45°C, extract with 120 parts of 1,2-dichloroethane, and neutralize the organic phase with 35 parts of 1% sodium carbonate aqueous solution to 6-7, separate the water layer for wastewater treatment, d...
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