The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 1977
Filed:
Sep. 13, 1976
John Anton Thorpe, Memphis, TN (US);
Harold Felton Porter, Hockessin, DE (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
Process for recovering reactants and products e.g., acrylonitrile and hydrogen cyanide from an aqueous stream obtained in the ammoxidation of propylene which comprises heating an aqueous stream containing the afore-said compounds in a heat exchanger by circulating the stream at a velocity of at least 6 ft/sec through the exchanger while maintaining the stream in the liquid state to increase the temperature of the stream to at least 105.degree. C and thereafter rapidly reducing the pressure of the heated stream sufficiently to vaporize 0.2-5% thereof and thereafter returning the vapor to the acrylonitrile process for recovery of energy used to heat the aqueous waste; usable materials e.g., acrylonitrile and hydrogen cyanide and compounds such as ammonia which can be used to neutralize acid streams and subsequently either incinerating the unvaporized material directly or using the unvaporized material as fertilizer after appropriate treatment.