DL-Pyroglutamic acid synthesis
- Product Name:DL-Pyroglutamic acid
- CAS Number:149-87-1
- Molecular formula:C5H7NO3
- Molecular Weight:129.11
56-86-0
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149-87-1
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Yield:149-87-1 65%
Reaction Conditions:
at 20 - 135; for 2 h;Large scale;
Steps:
1 Experimental Example 1: Preparation of pyroglutamic acid
Feed grade L-glutamic acid 400KG into the drying reactor,Open the stirring, slowly warming with steam,When the stability rose to 95 ° C,The system began to melt phenomenon,Rose to 130 when the system dissolved to clarify,Insulation 130 ~ 135 cyclization dehydration reaction 2 hours after the temperature below 100 ,Transferred to 800L dissolved in water,Continue to cool to room temperature crystallization 2 hours,Centrifugation to dryness, separation of DL-pyroglutamic acid solids,Collect the mother liquor.Mother liquor temperature 60 ~ 70 ,Add activated carbon 5KG,Stirring and stirring for 1 hour,Filter to dry,Filtrate concentrated dehydration to the volume of about 500 ~ 550L,Cooling 20 ~ 25 crystallization 4 hours,Centrifuge to dry mother liquor to be recycled ,The solid was dried at 50 ° C for 8 hours,Finished finished pyroglutamate 260KG,Yield; 65%.
References:
Chengdu Pepsi Xingkeji Industry Company Ltd.;Wang, Gang CN106336371, 2017, A Location in patent:Paragraph 0038; 0039; 0040
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