Detail of "3312-60-5"

Reference

Isolation of disazo condensation pigments

Isolation of disazo condensation pigments. Horacek, Josef; Necas, Miroslav; Cermak, Jiri (Czech. ). Czech. CS 206092 B 2 May 1984,4 pp. (Czech). (Czechoslovakia). CODEN: CZXXA9. CLASS: IC: C09B067-18. ICA: C09B033-06. APPLICATION: CS 79-5295 1 Aug 1979. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Disazo condensation pigments I (R = H) [3905-19-9] and I (R = Cl) [40618-31-3] were prepd. from 1-(2,5-dichlorophenylazo)-2-hydroxy-3-naphthoyl chloride [42481-25-4] and the corresponding 1,4-diaminobenzene in 1,2-C6H4Cl2 were isolated in a pure migration-resistant form, after addn. of 10-100% cyclohexylamine [108-91-8] or N-cyclohexyl-1,3-propanediamine [3312-60-5], by filtration or centrifugation and washing with MeOH or EtOH. The added amine increased the soly. of by-products and reduced the amt. of washing solvents required.

Preventing corrosion in alkaline systems

Preventing corrosion in alkaline systems. Foroulis, Zisis Andrew (Exxon Research and Engineering Co. , USA). Eur. Pat. Appl. EP 102712 A1 14 Mar 1984, 28 pp. DESIGNATED STATES: R: BE, DE, FR, GB, IT, NL. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C23F011-06; B01D053-14. APPLICATION: EP 83-304039 12 Jul 1983. PRIORITY: US 82-398077 14 Jul 1982; US 83-503061 10 Jun 1983. DOCUMENT TYPE: Patent CA Section: 55 (Ferrous Metals and Alloys) Corrosion of metals in alk. solns. (alkali metal salts or amine compds. used for scrubbing acid gases) is inhibited by addn. of an NH4+ or alkali metal polysulfide or an NH4+ or alkali metal sulfide and elemental S. Thus, in a soln. contg. K2CO3 28, N-cyclohexyl-1,3-propanediamine [3312-60-5] 7, pipecolinic acid [535-75-1] 7, Na2S 7.4, S 0.5, water 50.1 wt.%, a C steel had no corrosion, compared to 18.8-19.8 mm/yr in a soln. with no Na2S and S.