農硫酸法木材糖化プロセスの研究 (第16報) : 糖化廃硫酸の利用 (III) 燐酸苦土安門副産法

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A process for producing magnesium ammonium phosphate fertilizer utilizing waste sulfuric acid from wood-hydrolyzate was studied using a small pilot plant, and also on a laboratory scale.The main-hydrolysis of sawdust of sugi (Cryptomeria japonica) and of pre-hydrolyzed nemagaridake (Sasa senamensis Rehd) were accomplished by employing an extruder type continuous reactor having a treating capacity for dried sawdust of 30 g. per minute^<7)>. Leaching of the phosphate rock with the slurry produced as a result thereof from the main-hydrolysis substance by means of dilution was carried out by the wet process employing a batch type reactor having a capacity of 50 liters^<5)>. The results obtained are shown in Figure 1. A filtrate was obtained from the resultant product of the reaction by using a small filter press^<9)> having a filter area of 288.75 cm^2. Efficient separation of phosphoric acid in the wood-hydrolyzate was crried out on a laboratory scale by the following two methods. The first was by neutralizing the hydrolyzate with calcinated dolomite. The resulting precipitate of calcium and magnesium phosphate was filtered off and dried. This phosphatic prepration showed superiority in its citrate solubility degree above the tri-calcium phosphate preparation as shown in Table 3. The second was by neutralizing the hydrolyzate partially with magnesium hydroxide and then further neutralizing with ammonia to obtain mono-or hexa-hydrate crystals of magnesium ammoniium phosphate.It was found necessary to keep the additive quantity of ammonia at a level of 70-75% of the theoretically required quantity in order to keep the concentration of residual ammonia to a minimum in the resultant filtrate after having the phosphatic precipitate separated. See Table 6 and Figure 1. As an example of an appication of this experiment, the material balance for a new wood saccharification process with strong sulfuric acid acompanied with the by-product of magnesium ammonium phosphate was preliminary calculated as shown in Figure 2. This new process may provide the posibility of a new development in the traditional phosphatic fertilizer industry. One half of the work was related to the development of satisfactory conditions for post-hydrolysis step extracting phosphoric acid from phosphate rock in the system of phophoric acid-sulfuric acid-reducing sugar-water. The other half thereof was conducted in the laboratory for the purpose of finding a new process wherein a new phosphatic fertilizer of magnesium ammonium phosphate and a wood sugar solution could conveniently be separated.
社団法人日本生物工学会の論文
1963-04-15

農硫酸法木材糖化プロセスの研究 (第16報) : 糖化廃硫酸の利用 (III) 燐酸苦土安門副産法

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