Reference

Avoiding the corrosion of strippers in urea manufacturing plants

Avoiding the corrosion of strippers in urea manufacturing plants. Pagani, Giorgio; Faita, Giuseppe; Grassini, Ubaldo (Montedison S.p.A. 71631-40-8 and 7782-44-7 are also occured in this study. , Italy). Eur. Pat. Appl. EP 96151 A1 21 Dec 1983, 18 pp. DESIGNATED STATES: R: BE, DE, FR, GB, IT, NL. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C23F009-02; C23F011-02; C23F011-18; C07C126-02. APPLICATION: EP 83-101198 8 Feb 1983. PRIORITY: IT 82-21666 3 Jun 1982; IT 82-22962 25 Aug 1982. DOCUMENT TYPE: Patent CA Section: 55 (Ferrous Metals and Alloys) Section cross-reference(s): 45 In the manuf. of urea [57-13-6], corrosion of strippers consisting of falling-film heat-exchangers, by nonreacted reagents (NH3 and NH4NH2CO2 [1111-78-0]) is inhibited by injection of 500-2000 ppm O and 4-6 ppm H2O2. Thus, a stripper made of AISI 316 L (urea grade) [11134-23-9] stainless steel in the urea cycle was passivated by 500 ppm O and 4 ppm H2O2. The corrosion rate was 0.1 mm/yr, compared to 40 mm/yr when O alone was used. .

Pest control compositions

Pest control compositions. Kapp, Wolfgang (Deutsche Gesellschaft Fuer Schaedlingsbekaempfung m.b.H., Ger.). S. African ZA 7505587 22 Mar 1976, 7 pp. (Unavailable). (South Rica). CODEN: SFXXAB. CLASS: IC: A01N. APPLICATION: ZA 75-5587 2 Sep 1975. DOCUMENT TYPE: Patent CA Section: 5 (Agrochemicals) A compn. for pest control contains urea [57-13-6] coated with a mixt. of polymethylhydrogensiloxane in CCl4, dibutyltindilaurate [77-58-7] in CCl4, Al phosphide [20859-73-8] and ammonium carbamate [1111-78-0]. Thus, the amt. of phosphine available as a function of time in hs at 20.degree. 57-13-6 and 77-58-7 which are cas registry numbers of substances are two of reagents here. and 70% humidity was 31.8 at 0 h and 1.55 after 72 h. .