Araki, Yoshio

Goto, Rempei

Shimomoto, Sadao

Yamakita, Itsuro

Kyoto University Research Information Repository

Title Studies on Ship's Bottom Paints. (II) : Sedimentation Volumeof Ferric OxideAuthor(s)Goto, Rempei; Yamakita, Itsuro; Shimomoto, Sadao; Araki,YoshioCitation京都大学化学研究所報告 (1952), 28: 69-70Issue Date1952-03-30URL http://hdl.handle.net/2433/74397RightType Departmental Bulletin PaperTextversionpublisherKyoto University [this Bull. 21 1,  (1950)],  C, can be given  approxirnately  by the relation  1/Co  =11Q where Q is the heat of combustion. Results obtained are shown in the Table IL                                Table  IL  Q FlashLimit of Inflammation,  Co(%)                      Kcal Pt. °C                             obs.  calc.  Camphor 1,410.7 80 0.91 0.78      Naphthalene 1,231.9 84 1.00 0.91      Phthalic acid 783.8 149 1.65 1.44         anhydride             19. Studies on Ship's Bottom Paints. (II)                  Sedimentation Volume of Ferric Oxide  RemPei Goto, Itsuro  Yamakita, Sadao  Shirnomoto and  Yoshio  Araki                                (Goto Laboratory)    The sedimentation  volume of ferric oxide in various liquids was measured in order to investigate lyophilic properties of rouge, an important pigment of anti-corrosive ship's bottom paint.    Commercial ferric oxide was washed  with benzene, alcohol  and water. It was dried at about 110°C for several hours and finally in  CaC12-desiccator for a few days. The average particle size was about 2 microns in diameter. 2 gm. of the ferric oxide was dispersed in  20m1. of each liquid and its sedimentation volume was determined after complete settling.    The chief results may be summarized as follows. a) Non-polar liquids, such as  benzene, ethyl butyrate, cymene, mineral spirit and solvent naphtha, gave larger values of the sedimentation  volume  : polar liquids, such as pyridine, oleic acid, methyl alcohol, ethyl alcohol and butyl alcohol, gave smaller values. b) The sedimentation volume of dry ferric oxide in wet benzene showed a ten-dency to decrease with the water content. On the other hand, addition of moisture to  ferric oxide increased the sedimentation volume in dry benzene. c) Addition of other polar compounds, such as oleic acid, alcohols, rosin or dioxane, to dry benzene decreased the sedimentation volume of dry ferric oxide. d) Addition of water to methyl alcohol had a slightly increasing effect on the sedimentation  volume.                          (  69 )e) Presence of ferric chloride caused the sedimentation volume of ferric oxide in water to decrease remarkably.        20. Purification of Rice Oil. (Supplementary Report)  Itsaro  Yamakita                                (Goto Laboratory)   In the previous reports on the purification of rice oil (this Bulletin, Vol. 20, 64,  (1950); ibid., Vol. 24, 24 (1951)), it was mentioned that the surface active im-purity in crude rice oil could be easily separated as the deposit which was coagu-lated at oil-water interface, if an emulsion was formed by mixing the oil with dilute aqueous solution of some acids or salts, and it was  de-emulsified at room temperature. In order to know the more detailed mechanism of the separation of the impurity from crude rice oil, some experiments were carried out. The results, thus obtained, may be summarized as  follows: 1. The emulsion, which is formed from rice oil and dilute aqueous solution of some acids or salts, belongs to water-in-oil type. 2. The time  required to complete the  de-emulsification at room temperature varies with the purification degree of rice oil from which the emulsion is formed, and the samples, which show longer  de-emulsification time, produce more deposit at oil-water interface after the completion of the  de-emulsification. 3. The interfacial tension between rice oil and water varies with the content of the impurity and free fatty acids in  the,  oil  ; for example the interfacial tension is considerably reduced in the case of a oil with higher acid value by a small amount of the impurity, such as rice  wax, partially decomposed  tri-g7ycerides and iron soaps which are the principal components of the deposit. 4.  From the experimental facts (1-3) mentioned above and the microscopic observations regarding the emulsion  and the deposit, it may be deduced that the separation of the impurity  from crude rice oil is caused by the orientation of surface active substances at tho oil-water interfaces of the emulsion formed from the oil.  C  70  )

Studies on Ship's Bottom Paints. (II) : Sedimentation Volume of Ferric Oxide

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Studies on Ship's Bottom Paints. (II) : Sedimentation Volume of Ferric Oxide

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