| US 7,514,059 B2 | ||
| Method for the production of hydrocyanic acid | ||
| Andreas Deckers, Flomborn (Germany); Arnulf Lauterbach, Ludwigshafen (Germany); Anton Negele, Deidesheim (Germany); and Thomas Schneider, Frankenthal (Germany) | ||
| Assigned to BASF Aktiengesellschaft, Ludwigshafen (Germany) | ||
| Appl. No. 11/574,064 PCT Filed Sep. 02, 2005, PCT No. PCT/EP2005/009476 § 371(c)(1), (2), (4) Date Feb. 22, 2007, PCT Pub. No. WO2006/027176, PCT Pub. Date Mar. 16, 2006. |
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| Claims priority of application No. 10 2004 042 986 (DE), filed on Sep. 06, 2004. | ||
| Prior Publication US 2007/0231239 A1, Oct. 04, 2007 | ||
| Int. Cl. C01C 3/02 (2006.01) | ||
| U.S. Cl. 423—373 | 4 Claims |
| 1. A process for preparing hydrocyanic acid, comprising:
performing catalytic dehydration of gaseous formamide to obtain a product mixture; and
recirculating a formamide-containing recycle stream obtained from the product mixture to the dehydration;
wherein:
the formamide-containing recycle stream comprises from 15 to 50% by weight of water; and
the formamide-containing recycle stream is obtained by:
condensing out a mixture of water, formamide, high boilers and dissolved gases from the product mixture after the dehydration
as a first condensate;
separating off a part of the water and the dissolved gases from the first condensate to obtain a second condensate comprising
water, formamide and high boilers; and
separating off the formamide-containing recycle stream from the second condensate by simple distillation.
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