THE RELATIVE ENTHALPIES OF CONCENTRATED POTASSIUM HYDROXIDE SOLUTIONS

1960 ◽  
Vol 38 (1) ◽  
pp. 57-60 ◽  
Author(s):  
Wendell J. Biermann
Keyword(s):  
Hydrochloric Acid ◽  
Potassium Hydroxide ◽  
Concentrated Solutions ◽  
Relative Enthalpy ◽  
Better Than ◽  
Enthalpy Data

Measurements were made of the heats of neutralization of concentrated solutions of potassium hydroxide with hydrochloric acid, with an estimated accuracy better than one part per thousand. From this information it was possible to calculate relative enthalpy data for potassium hydroxide solutions up to 16 molal.

scholarly journals PICKLING EXPERIMENTAL STUDY ON PREPARATION OF DIESEL OIL WITH PYROLYSIS OIL FROM WASTE RUBBER

2017 ◽  
Vol 1 ◽  
pp. 169
Author(s):  
Wang Lei ◽  
Wang Yun ◽  
Jin Jie
Keyword(s):  
Experimental Study ◽  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Diesel Oil ◽  
Pyrolysis Oil ◽  
Waste Rubber ◽  
Pickling Process ◽  
Concentrated Sulfuric Acid ◽  
Better Than

The research has been done for removing asphaltene by pickling process of diesel oil from pyrolysis oil self-made by waste rubber in this paper, and the study showed that pickling effect of concentrated sulfuric acid was better than concentrated hydrochloric acid. The best pickling effect was found when the concentration of sulfuric acid was 18.4mol/L, acid to oil ratio, namely, the amount of concentration of sulfuric acid to the amount of diesel oil ratio, was 25%. This experiment proved that removing asphaltene by pickling process using concentrated sulfuric acid was remarkable.

Liquid Chromatographic Method for Identity, Assay, and Content Uniformity of Five Tricyclic Drugs

1985 ◽  
Vol 68 (2) ◽  
pp. 168-171
Author(s):  
Edward G Lovering ◽  
Normand Beaulieu ◽  
Robert C Lawrence ◽  
Roger W Sears
Keyword(s):  
Hydrochloric Acid ◽  
Active Ingredient ◽  
Dilute Hydrochloric Acid ◽  
Chromatographic Method ◽  
Internal Standard ◽  
Peak Height ◽  
Content Uniformity ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic ◽  
Better Than

Abstract A liquid chromatographic (LC) procedure has been developed for the assay, content uniformity, and identification of single active ingredient solid and liquid formulations of amitriptyline, chlorpromazine, imipramine, thioridazine, and trifluoperazine. The drugs are extracted from their formulations with methanol or dilute hydrochloric acid, and identified by comparison of retention times with those of known standards; drugs are quantitated against these standards with rf/-norephedrine hydrochloride as the internal standard. The precision of replicate injections is better than 2.5% for peak area and better than 1% for peak height. The precision of triplicate determinations of tablet composites is better than 2.2%.

Research on Enhanced Straw Saccharification Technology of Hydrogen Production

2010 ◽  
Vol 113-116 ◽  
pp. 2025-2029
Author(s):  
An Ying Jiao ◽  
Kun Liu ◽  
Wen Li ◽  
Bing Liu ◽  
Yong Feng Li
Keyword(s):  
Hydrochloric Acid ◽  
Hydrogen Production ◽  
Sugar Content ◽  
Complex Structure ◽  
Hydrogen Yield ◽  
Experimental Time ◽  
Saccharification Efficiency ◽  
Better Than ◽  
Acid Ionization

Straw has a complex structure composed mainly by cellulose, hemicellulose and lignin, resulting in the difficulty to use it as the substrate for hydrogen production directly. Hydrogen production from saccharification plant straw was performed in this study. The effect of experimental time and temperature on saccharification efficiency of the straw was investigated in this work. The results show that efficiency of saccharification by hydrochloric acid on plant straw is better than that by acetate due to the different extent of acid ionization. The maximum sugar content of 36.8 Brix and 35.4 Brix was acquired at the experimental time of 1h and temperature of 20°C with the corresponding hydrogen yield of 0.02mlH2/L saccharification liquid and 0.0182mlH2/L saccharification liquid by bacteria SUES-1, respectively.

scholarly journals THE COMBINATION OF GELATIN WITH HYDROCHLORIC ACID

1929 ◽  
Vol 12 (4) ◽  
pp. 495-509 ◽  
Author(s):  
David I. Hitchcock
Keyword(s):  
Hydrochloric Acid ◽  
Osmotic Pressure ◽  
Concentrated Solutions ◽  
Liquid Junction ◽  
Hydrogen Electrode

1. Cooper's gelatin purified according to Northrop and Kunitz exhibited a minimum of osmotic pressure and a maximum of opacity at pH 5.05 ±0.05. The pH of solutions of this gelatin in water was also close to this value. It is inferred that such gelatin is isoelectric at this pH and not at pH 4.70. 2. Hydrogen electrode measurements with KCl-agar junctions were made with concentrated solutions of this gelatin in HCl up to 0.1 M. The combination curve calculated from these data is quite exactly horizontal between pH 2 and 1, indicating that 1 gm. of this gelatin can combine with a maximum of 9.35 x 10–4 equivalents of H+. 3. Conductivity titrations of this gelatin with HCl gave an endpoint at 9.41 (±0.05) x 10–4 equivalents of HCl per gram gelatin. 4. E.M.F. measurements of the cell without liquid junction, Ag, AgCl, HCl + gelatin, H2, lead to the conclusion that this gelatin in 0.1 M HCl combines with a maximum of 9.4 x 10–4 equivalents of H+ and 1.7 x 10–4 equivalents of Cl- per gram gelatin.

The Electrical Conductivity Stability of Polyaniline Doped with Three Different Acids

2013 ◽  
Vol 774-776 ◽  
pp. 803-806
Author(s):  
Ren Chun Fu ◽  
Jun Du ◽  
Hui Huang ◽  
Zhong Cheng Guo
Keyword(s):  
Electrical Conductivity ◽  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Temperature Dependence ◽  
Methanesulfonic Acid ◽  
Variable Range Hopping ◽  
As Doping ◽  
The Stability ◽  
Better Than

The doping acid will obviously effect on the properties of polyaniline. In order to investigate the industrial acids influence the electrical conductivity stability of polyaniline, the hydrochloric acid (HCl), sulfuric acid (SA) and methanesulfonic acid (MSA) in industrial degree were chosen as doping acids to synthesize polyaniline. The stability of electrical conductivity was measured by in situ temperature. The mechanism of temperature dependence of electrical conductivity was discussed. The results revealed that the stability of polyaniline doped by hydrochloric acid (HCl) was better than that of polyaniline doped by other acids. The variable-range hopping (VRH) model could explain the temperature dependence of electrical conductivity of polyaniline.

scholarly journals Electrodeposited Benzothiazole Phthalocyanines for Corrosion Inhibition of Aluminium in Acidic Medium

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Nnaemeka Nnaji ◽  
Njemuwa Nwaji ◽  
Tebello Nyokong
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solution ◽  
Corrosion Inhibition ◽  
Hydrochloric Acid Solution ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
Corrosion Attack ◽  
X Ray ◽  
Eis Measurements ◽  
Better Than

Tetrakis[(benzo[d]thiazol-2-yl-thio) phthalocyaninato] gallium(III)chloride (1) and tetrakis[(benzo[d]thiazol-2ylphenoxy) phthalocyaninato] gallium(III)chloride (2) were successfully electrodeposited onto aluminium for corrosion retardation in 1.0 M hydrochloric acid solution. The aim of this study was to compare the corrosion resistance of electrodeposited metallated phthalocyanines. Scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy (EIS), and polarization confirmed the aluminium corrosion inhibition potentials of complexes 1 and 2. EIS and polarization techniques showed that complex 2 performed better than complex 1, with values from EIS measurements of 82% for 1 and 86% for 2 in 1.0 M hydrochloric acid solution. The importance of electrodeposition in industries and a dearth of research on the use of electrodeposited metallated phthalocyanines necessitated this study, and results show that coatings formed by electrodeposition of 1 and 2 onto aluminium reduced its susceptibility to corrosion attack.

Redoping Effects on Structure and Properties of Coaxial Polyaniline/Carbon Nanotube Nanocomposites

2014 ◽  
Vol 692 ◽  
pp. 352-355
Author(s):  
Yi Zhou ◽  
Wen Yi Li ◽  
Qing Wu Tian ◽  
Da Jun Zhang
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Hydrochloric Acid ◽  
Oxidative Polymerization ◽  
Structure And Properties ◽  
Chemical Oxidative Polymerization ◽  
Multiwalled Carbon ◽  
Ultrasonic Assisted ◽  
Scanning Electron ◽  
Better Than

Coaxial polyaniline/multiwalled carbon nanotubes (MWCNTs) nanocomposites were prepared by ultrasonic–assisted chemical oxidative polymerization of aniline monomers in hydrochloric acid solution, in which MWCNTs with minimal defects was used as a template. Redoping of hydrochloric acid was achieved after the as-prepared nanocomposites were treated by ammonia. The nanocomposites were characterized by field emission scanning electron microscopy, fourier transform infrared spectroscopy, thermogravimetric analysis and cyclic voltammetry, respectively. The results indicated that HCl doped nanocomposites were better than HCl redoped nanocomposites on the thermal stability and electrochemical properties.

Influence of Physical and Chemical Properties on the Activity of Fly Ashes

1987 ◽  
Vol 113 ◽  
Author(s):  
F. Sybertz
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Hydrochloric Acid ◽  
Potassium Hydroxide ◽  
Chemical Properties ◽  
Experimental Program ◽  
Physical And Chemical Properties ◽  
Fly Ashes ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACTIn an experimental program, the suitability of various methods for testing the pozzolanic activity of fly ash was investigated. The research was conducted on virtually all fly ashes approved as concrete additives in Germany. This paper discusses differences in the particle size distribution and the solubility on dissolution with hydrochloric acid and potassium hydroxide of the fly ashes. It also reports on interrelationships between the physical and chemical properties of the fly ashes and the workability and strength of mortars containing fly ash.

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