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Sulphate method

Dimethyl Sulphate Method for hydroxy compounds and for primary and secondary amines, acid amides, etc. The substance is dissolved or suspended in water, a small excess (above the theoretical) of sodium hydroxide added and then the theoretical quantity of dimethyl sulphate, the mixture being finally shaken without external warming. Methylation is usually rapid, the dimethyl sulphate being converted to methyl hydrogen sulphate... [Pg.218]

The Formaldehyde-Formic Acid Method, This method applies to primary and secondary amines, which when boiled with a formalin-formic acid mixture undergo complete methylation to the corresponding tertiary amine. This method has the advantage over the dimethyl sulphate method in that quaternary salts clearly cannot be formed. [Pg.218]

Cellulose Chemistry , London (1947), 245—47 22) B.T. Fedoroff, Rapid Method for the Determination of Nitrogen Content of Nitrocellulose by the Ferrous Ammonium Sulphate Method , PACLR 122871 (1948) 23) J. Pearson... [Pg.302]

The separation of cellulose from the wood is carried out by one of three methods the soda process, the sulphate process, and the sulphite process. Nitration cellulose is prepared chiefly by the sulphite and sulphate methods. [Pg.365]

Table V.26 Separation of Group IV cations with the sulphate method The ppt. may contain BaC03, SrC03, and CaC03. Wash with a little hot water and reject the washings. Dissolve the ppt. in 5 ml hot 2m acetic acid by pouring the acid repeatedly through the filter paper. Test 1 ml for barium by adding K2Cr04 solution dropwise to the nearly boiling solution. A yellow ppt. indicates Ba. Table V.26 Separation of Group IV cations with the sulphate method The ppt. may contain BaC03, SrC03, and CaC03. Wash with a little hot water and reject the washings. Dissolve the ppt. in 5 ml hot 2m acetic acid by pouring the acid repeatedly through the filter paper. Test 1 ml for barium by adding K2Cr04 solution dropwise to the nearly boiling solution. A yellow ppt. indicates Ba.
As in the macro scale, two methods are recommended for the separation of Group IV cations the sulphate method is the generally accepted procedure even in semimicro scale, but the nitrate method is equally suitable. The two methods are outlined in Tables VI. 17 and VI. 18 respectively. [Pg.490]

Colour Test. Copper Sulphate (Method 1)—blue. [Pg.899]

Colour Tests. Copper Sulphate (Method 2)—blue (1 to 2 min) Mandolin s Test—red Marquis Test—yellow Methanolic Potassium Hydroxide—yellow Sulphuric Acid—yellow. [Pg.970]

Colour Tests. Copper Sulphate (Method 1)—green ( - violet) Koppanyi-Zwikker Test—red-violet Mercurous Nitrate— black. [Pg.978]

Colour Tests. Coniferyl Alcohol—orange Copper Sulphate (Method 1)—green Koppanyi-Zwikker Test—pink Mercurous Nitrate—black Nitrous Acid—yellow. [Pg.982]

Lll. Liddelow, B., The limitations of the rapid copper sulphate method for the estimation of serum protein concentration. Med. J. Australia 2, 565-566 (1953). [Pg.293]

The sulphations described above change the activity of the samples in the Claus reaction. The rates of H2S oxidation with S02 over pure and sulphated alumina are presented In Figure 2. At the lewer H2S and SO2 concentrations the activities of the sanples sulphated both ways are lower than those of the pure alumina, and their deactivation is faster The application of a higher concentration of reagents causes the increase in the initial reaction rate over alumina sulphated by method A (Fig 2b) Sulphation by method B decreases the catalyst activity. This method leads to a lower concentration of sulphate species over the catalyst surface The increase of the initial conversion of H2S after alumina sulphation (method A) is accompanied by a decrease of SO2 conversion This suggests that H2S reacts with sulphate species Such a reaction is slow (ref. 2) and most pro-... [Pg.455]

J3. Jeanloz, R. W., Chondroitin 4-sulphate. Methods Carbohyd. Chem. 5, 110-113 (1965). [Pg.86]


See other pages where Sulphate method is mentioned: [Pg.698]    [Pg.366]    [Pg.442]    [Pg.442]    [Pg.435]    [Pg.455]    [Pg.366]   
See also in sourсe #XX -- [ Pg.244 ]




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