Removal Of Free Acids Research Articles

Removal of free acids from heavy alkylbenzene sulfonic acid by a novel three-step method

Excessive amounts of free acids will significantly reduce the quality of heavy alkylbenzene sulfonic acid and its downstream products. To get rid of the excess free acids in heavy alkylbenzene sulfonic acid, a novel three-step deacidification technique called barium salt neutralization method was developed with the aware of “process intensification” in this work. Various factors affecting the deacidification process were thoroughly studied. Results show that using this deacidification method, the free acids content in heavy alkylbenzene sulfonic acid can be reduced from 1.5% to less than 0.1% at the producing condition of room temperature, atmospheric pressure, reusable green solvent, and short time. The free acids removal rate and recovery rate of feed can reach to 96.7% and 95.3%, respectively. It has been demonstrated that the barium salt neutralization method is an effective way to lower the amount of free acids in heavy alkylbenzene sulfonic acid, and can be readily turned into practical applications.

Skeletonization of mixed arachidic acid/cadmium arachidate LB films: A study using atomic force microscopy

The microscopic structure of skeletonized films of cadmium arachidate has been studied by atomic force microscopy (AFM)—skeletonization is the removal of free acid from a mixed Langmuir–Blodgett (LB) films and the AFM methods used are detailed, AFM images and results from a two‐dimensional fast Fourier transform analysis are discussed, and factors affecting the overall cadmium arachidate content of the transferred film are considered.

On the Activation of Pancreatic Lipase by Calcium Chloride at Varying pH

Summary.The activating influence of calcium chloride on the hydrolysis by pancreatic lipase of several saturated triglycerides and triolein has been investigated at different pH.1. With increasing number of carbon atoms in the fatty acids of the triglycerides the optimum pH for pancreatic lipase is displaced from 7 to 8.8.2. Addition of CaCl2 does not alter the optimum pH for the enzymatic activity towards a triglyceride.3. CaCl2 activates the hydrolysis of all triglycerides investigated in homogeneous as well as in heterogeneous systems and both in alkaline and acid medium.4. In the presence of CaCl2 the pH‐activity range for the higher saturated triglycerides is widened one pH unit on the acid side.5. The higher free fatty acids are supposed to depress the hydrolysis by pancreatic lipase in a high degree, and the pronounced activation by CaCl2 in experiments with higher triglycerides is explained by the removal of free acids as insoluble calcium soaps.6. The experiments do not support WILLSTÄTTER'S theory of the activation of lipase by formation of complex adsorbates.

Cjemical Study on the Removal of Free Acids in Tama River

(1) 玉川毒水除害の目的の下に湧泉と澁黒温泉地帯附近にて得られる安山岩,粘土類との作用に就き研究せる結果粘土,安山岩粉末はその使用量を増加する時は比較的短時間にても迅速に作用し遊離酸の97%をも容易に除去し得られ遊酸除去劑として甚だ有効なる事が認められた.(2) 澁黒湧泉は大理石とは極めて迅速に作用して中和される.從つて澁黒湧泉の中和には炭酸石灰を使用し得られる.(3) 澁黒湧泉の遊離酸除去の實施方法につき考察し湧泉の地下注入法が最も適合するものなる事を述べた.(4) 玉川下流に於て灌流用水その他に利用する場合の遊離酸除去法としては河水の必要量を分水し炭酸石灰中和法を行ふ事が適當なる事を述べた.(5) 秋田縣廰にて實施しつつある玉川毒水除害事業に就き筆者の關與せる湧泉の地下注入法實施状況の概要を述べpH1.1の原泉が地下注入後澁黒河岸に漏出せるものはpH2.8となり豫期の如く遊離酸の大部分が除去せられ地下注入法の甚だ有効なる事が實證せられた事を述べた.(6) 玉川毒水類似の遊離酸含有河川に對しその源泉附近にて地下注入法を應用する時には玉川毒水の如く含有遊離酸の大部分を除去し得べき事を考察した.

The removal of free acid from nitrocellulose with special reference to the use of saline leaches

The removal of free acid from nitrocellulose with special reference to the use of saline leaches

The Removal of Free Acid from Nitrocellulose with Special Reference to the Use of Saline Leaches

The Removal of Free Acid from Nitrocellulose with Special Reference to the Use of Saline Leaches