Роданид аммония
Роданид аммония
В лаборатории получал сульфидирующие газы разложением радонида аммония при 240 С. При этом выделяется H2S, CS2, (NH4)2S и остается белая (иногда желтая) аморфная масса. Очень интересно узнать состав этого осадка. Может кто-нибудь занимался подобными процессами?
Вот есть некоторая литература по этому вопросу, вообще процесс явно неравновесный то есть процесс разложения в зависимости от флюктуаций температуры, давления и еще много чего может давать совершенно разные продукты
Bibliographic Information
Decomposition of ammonium thiocyanate, thiourea, and the like. Tekatch, William M.; Balaz, Karol J. (Can.). U.S. (1989), 4 pp. CODEN: USXXAM US 4832930 A 19890523 Patent written in English. Application: US 88-188851 19880502. CAN 111:99865 AN 1989:499865 CAPLUS
Patent Family Information
Patent No. Kind Date Application No. Date
US 4832930 A 19890523 US 1988-188851 19880502
Priority Application
US 1988-188851 19880502
Abstract
The decompn. of NH4SCN and/or thiourea comprises mixing the compds. with molten ammonium sulfamate, and maintaining the resulting mixt. at >250 but <444.6 under atm. pressure until completion of the reaction is achieved, i.e., no further evolution of gases is evident. The compds. decomp. giving off CO2, SO2, NH3, and S, and leave a residue of ammonium salts but no thiocyanate or org. materials.
http://v3.espacenet.com/origdoc?DB=EPOD ... =US4832930
Bibliographic Information
Decomposition of ammonium thiocyanate. Andrezheevskii, M. Yu.; Maiskaya, G. G.; Lyapkin, A. A. VUKhIN, USSR. Koks i Khimiya (1988), (12), 27-9. CODEN: KOKKAI ISSN: 0023-2815. Journal written in Russian. CAN 110:195705 AN 1989:195705 CAPLUS
Abstract
The thermal decompn. of aq. solns. of NH4CNS at 300 and 1 atm leads to the formation of gaseous products (NH3, CS2, H2S) and solids (probably melamine and guanidine thiocyanate). The presence of toxic CS2 and formation of a large amt. of solid products are neg. factors impeding the utilization of the process.
Thermal decomposition of thiourea and its salts. Communication 2. Nurakhmetov, N. N.; Beremzhanov, B. A.; Utina, Z. E.; Medikhanov, D. G. USSR. v sb., Khimiya i Khim. Tekhnol., Alma-Ata (1974), (16), 53-8. From: Ref. Zh., Khim. 19B942. Journal written in Russian. CAN 86:71875 AN 1977:71875 CAPLUS
Bibliographic Information
Decomposition of thiocyanates in ultra-violet light. Jablczynski, K.; Jablczynska, H. Roczniki Chemii (1930), 10 579-99 (599-600 German). CODEN: ROCHAC ISSN: 0035-7677. Journal language unavailable. CAN 25:8211 AN 1931:8211 CAPLUS
Abstract
The decompn. of NH4 K and Na thiocyanates under the influence of ultra-violet light of a quartz lamp of Heraeus type was investigated spectrophotometrically. The decompn. was accompanied by a sepn. of S. As this reaction takes place endothermally the opposite reaction, that is the formation of the thiocyanate from S, must proceed spontaneously in distant places of the soln. Both simultaneous processes must lead to an equil. which was observed experimentally. It was found that the decompn. reactions of thiocyanates are autocatalytic and correspond very well with the equation K = [1/(1 + d)t] log[(x + d)/d(1 - x)], where t is time, x degree of partial turbidity and d is a const. When to a fresh soln. of the thiocyanate a little of the turbid soln. of the preceding expt. is added the reaction velocity is greatly accelerated. With the dilution of the thiocyanate the equil. point is displaced and a max, of the reaction velocity appears on the concn. line. The temp. has a big influence on the velocity. It is true the main reaction (decompn.) being photochemical should be independent of the temp. yet the opposite reaction depends upon the temp. to a large extent. The addn. of an acid increases the velocity supposedly because the thiocyanic acid set free is more easily decompd. than its salts. Addn. of KCl, Zn and Ni sulfate to KCNS soln. accelerates the decompn. which is dependent on the cation. The decompn. of NH4, K and Na thiocyanates takes place only under the influence of rays of length of 3000 and 1850 A. U.
Bibliographic Information
Decomposing thiocyanates. Hansen, Christian J. (1928), FR 661508 19281005 Patent language unavailable. CAN 24:3854 AN 1930:3854 CAPLUS
Bibliographic Information
Decomposition of ammonium thiocyanate, thiourea, and the like. Tekatch, William M.; Balaz, Karol J. (Can.). U.S. (1989), 4 pp. CODEN: USXXAM US 4832930 A 19890523 Patent written in English. Application: US 88-188851 19880502. CAN 111:99865 AN 1989:499865 CAPLUS
Patent Family Information
Patent No. Kind Date Application No. Date
US 4832930 A 19890523 US 1988-188851 19880502
Priority Application
US 1988-188851 19880502
Abstract
The decompn. of NH4SCN and/or thiourea comprises mixing the compds. with molten ammonium sulfamate, and maintaining the resulting mixt. at >250 but <444.6 under atm. pressure until completion of the reaction is achieved, i.e., no further evolution of gases is evident. The compds. decomp. giving off CO2, SO2, NH3, and S, and leave a residue of ammonium salts but no thiocyanate or org. materials.
http://v3.espacenet.com/origdoc?DB=EPOD ... =US4832930
Bibliographic Information
Decomposition of ammonium thiocyanate. Andrezheevskii, M. Yu.; Maiskaya, G. G.; Lyapkin, A. A. VUKhIN, USSR. Koks i Khimiya (1988), (12), 27-9. CODEN: KOKKAI ISSN: 0023-2815. Journal written in Russian. CAN 110:195705 AN 1989:195705 CAPLUS
Abstract
The thermal decompn. of aq. solns. of NH4CNS at 300 and 1 atm leads to the formation of gaseous products (NH3, CS2, H2S) and solids (probably melamine and guanidine thiocyanate). The presence of toxic CS2 and formation of a large amt. of solid products are neg. factors impeding the utilization of the process.
Thermal decomposition of thiourea and its salts. Communication 2. Nurakhmetov, N. N.; Beremzhanov, B. A.; Utina, Z. E.; Medikhanov, D. G. USSR. v sb., Khimiya i Khim. Tekhnol., Alma-Ata (1974), (16), 53-8. From: Ref. Zh., Khim. 19B942. Journal written in Russian. CAN 86:71875 AN 1977:71875 CAPLUS
Bibliographic Information
Decomposition of thiocyanates in ultra-violet light. Jablczynski, K.; Jablczynska, H. Roczniki Chemii (1930), 10 579-99 (599-600 German). CODEN: ROCHAC ISSN: 0035-7677. Journal language unavailable. CAN 25:8211 AN 1931:8211 CAPLUS
Abstract
The decompn. of NH4 K and Na thiocyanates under the influence of ultra-violet light of a quartz lamp of Heraeus type was investigated spectrophotometrically. The decompn. was accompanied by a sepn. of S. As this reaction takes place endothermally the opposite reaction, that is the formation of the thiocyanate from S, must proceed spontaneously in distant places of the soln. Both simultaneous processes must lead to an equil. which was observed experimentally. It was found that the decompn. reactions of thiocyanates are autocatalytic and correspond very well with the equation K = [1/(1 + d)t] log[(x + d)/d(1 - x)], where t is time, x degree of partial turbidity and d is a const. When to a fresh soln. of the thiocyanate a little of the turbid soln. of the preceding expt. is added the reaction velocity is greatly accelerated. With the dilution of the thiocyanate the equil. point is displaced and a max, of the reaction velocity appears on the concn. line. The temp. has a big influence on the velocity. It is true the main reaction (decompn.) being photochemical should be independent of the temp. yet the opposite reaction depends upon the temp. to a large extent. The addn. of an acid increases the velocity supposedly because the thiocyanic acid set free is more easily decompd. than its salts. Addn. of KCl, Zn and Ni sulfate to KCNS soln. accelerates the decompn. which is dependent on the cation. The decompn. of NH4, K and Na thiocyanates takes place only under the influence of rays of length of 3000 and 1850 A. U.
Bibliographic Information
Decomposing thiocyanates. Hansen, Christian J. (1928), FR 661508 19281005 Patent language unavailable. CAN 24:3854 AN 1930:3854 CAPLUS
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