Revista de Chimie, iulie-decembrie 1965 (Anul 16, nr. 7-12)
1965-07-01 / nr. 7
^cryií&n is D. GOIDEA, The scientific research, an important factor of the chemical industry development 273 C. SAVA, The tasks of the Chemical Works Borzeşti as part of the Directives of the IX-th Congress of the Rumanian Communist Party ................................................ 275 N. GRÄDINARU, Achievements and prospects .......... 276 I. BOTEZ, For a high production of nitrogen fertilizers .................................................... 277 A. BANU, Achievements at the chemical fertilizer Works Valea Călugărească .......... 279 N. MURGU, Some aspects concerning the quality improvement of exported chemical products 281 I. VELEA, M. KLANG, T. VEXLER, D. CORNILESCU and N. DUINEA Contributions to the stabilization of vinyl polymers by means of metallic soaps. Note 1.................................................. 285 N. CIOC, I. MANU and EL. BĂLĂNESCU, The preparation and utilization of complex fertilizers with slowly assimilable N (ureoform-phosphoric) ............................. 291 K. WINNACKER, Development tendencies of the chemical industry ............................................ 293 A. PAVEL, The calculus of the optimum layer height in the case of heat exchangers with monostored and multistored fluidified layers 301 A. MÄNCIULESCU, Some problems concerning the designing of high-capacity urea lines.............. 303 FL. BUNUŞ, The radiochemical determination of some cross sections in nuclear reactions from wolfram targets with rapid neutrons (14.5 MeV) ................................................. 313 E. GROU, Contributions to the determination of low simazine and atrazine quantities in soil........................................................ 316 LABOUR PROTECTION V. GALEA, E. T. BÎRSAN and I. URAY, The decontamination of waters containing 8üSr and 90Y with gypsum and bentonites .................................................... 318 BRIEF reports..................................... GR. POPA, D. CRUCERU, GH. BAIULESCU and C. GREFF, The amperometric determination of Zr (IV) by means of a new azopyrazolonic derivative ................................................. 321 D. POPESCU and M. VAENI, Contributions to the determination of the Tricolaval pills .................................. 321 H. BERAL, V. GAMENTHY and I. BUCUR, The determination of 5-chloro-benzoxazolinone in Paraflex tablets .............. 322 A. WOHL, A nomogram for oleum dilution .... 323 CHRONICLE ............................................ 324 ECONOMIC NEWS ................................. 324 DOCUMENTATION ......................... 330 NEW BOOKS ........................................ 340 I. Vele a, M. Klang, T. Vexier, D. Cornilescu and N. D u i n e a: Contributions to the stabilization of vinyl polymers by means of metallic soaps. Note I. The influence of the non-saturation degree of the fat acids from metallic soaps on the thermic stability of vinyl polychloride is followed. Some indications are given concerning the possibilities of turning to account the manufacturing sebacic acid. As concerns the methods of estimating the thermic stability of PVC it is considered that the ISO method (HC1 detection with Congo red) does not represent a sufficient estimation means. Rev. Chim. 16, 7, p. 285 D.C. 678.743.22.04; 661.8.75 :66.022.38 N. Cioc, I. Manu and El. Bălănescu: The preparation and utilization of complex fertilizers with slowly assimilable N (ureoform-phosphoric). The preparation method of the complex fertilizer with slowly assimilable N and phosphorus is described. The variation in the molar ratio urea formaldehyde/P, and in temperature is studied in order to establish the optimum yield condition. The cooling of the reaction product to 10 —12°C is shown to determine an yield increase of 12 — 16%. The acid medium required by the reaction is achieved by adding industrial superphosphate. The product contains: 32% slowly assimilable N and 2 — 3% soluble PjOs. The vegetation tests using winter wheat and strongly sandy soil led to better results as compared to ammonium nitrate. Rev. Chim. 16, 7, p. 291 D.C. 631.893.12:631.841.7 A. Pavel: The calculus of the optimum layer height in the case of heat exchangers with monostored and multistored fluidified layers. A method of calculating the height of the layer in non-fluidified state is presented as well as its basic technical and economic considerations. The layer height calculated by this method ensures a high efficiency of heat exchangers and a hydraulic resistance not exceeding the value corresponding to the most advantageous exploitation. The cases in which the installation of heat exchangers with fluidified layers is considered suitable have also been established. Rev. Chim. 16, 7, p. 301 D.C. 536.24.001.13:66.096.5 Fl. В u n u ş : The radiochemical determination of some cross sections in nuclear reactions from wolfram targets with rapid neutrons (14.5 MeV). A radiochemical study based on the activation technique has been carried out for determining some cross sections in nuclear reactions with rapid neutrons (14.5 MeV). The nuclear reaction D + T has been chosen as a neutron source. After being accelerated in a Cockroft-Walton installation, the deuterons hit tritiated titanium or zirconium targets. The nuclear reaction 5eFe (np) 56 Mn has been chosen as a neutron fllux monitor. Nuclear reactions of the (np), (nd), (nx) types in wolfram targets have been investigated and a specific chemical method for separating the respective elements (W, Та, HO has been worked out. The activity measurements have been made by means of a proportional window counter with calibrated flowing gas as compared with a 4~ counter with flowing gas (proportional). The results obtained are interpreted. Rev. Chim. 16, 7, p. 313 D. C. 539.185:546.78 E. Grou: Contributions to the determination of low simazine and atrazine quantities in soil. The description is given of a colorimetric method for the microdetermination of chloralkyl-aminos-triazinic herbicides (simazine, atrazine, propazine and trietazine) based on the reaction between the glutaconic aldehyde resulted from the reaction of these compounds with pyridine and the barbituric acid in the presence of the glacial acetic acid. The violet red colouring obtained is very stable and less influenced by impurities than the yellow one obtained from the pyridine reaction. The method can be used to determine these substances directly in soil extracts without requiring any previous purification. Rev. Chim. 16, 7, p. 316 D.C. 632.954:545.81 V. Galea, E. T. Bîrsan and I. Uray: The determination of waters containing 90Sr and 80Y with gypsum and bentonites. The decontaminating capacities of raw gypsum, commercial superphosphate and some indigenous bentonites have been studied. The experiments carried out took into consideration the added quantity of decontaminating agent, the different proportions of mixtures involving two decontaminating agents» the presence of salts normally found in surface waters and the pH. A good yield is obtainable with raw gypsum especially if water is also subjected to fluorination. As concerns the bentonites, it is preferable to work with two-bentonite mixtures. Rev. Chim. 16, 7, p. 318 D.C. 628.54:546.42.02:546.641.02 Gr. Popa, D. Cruceru, Gh. Baiulescu and C. Greff: The amperometric determination of Zr (IV) by means of a new azopyrazolonic derivative. A new azopyrazolonic dye namely the dissodic salt of the 3-methyl-5-oxo-l-phenyl-2-pyrazoline-4- ilazo-2’-(6’,8’-naphtalenedissulphonic) acid is suggested as a reactant for the amperometric determination of Zr (IV). The method described allows the determination of zirconium between the limits of 0.2 — 4 mg. The maximum error of the determinations is 3.5%. Rev. Chim. 16, 7, p. 321 D.C. 546.831.04:545.38