In this research a reaction of dehydration of methanol to
dimethyl ether on a microporous amorphous alumina xerogel
catalyst was studied. The catalyst possess a high surface area
(475 m2/g).
The Arak and Wine are common alcoholic spirits in Syria. However, those spirits are often produced outside the controls of the manufacturing cycle in terms of fermentation and distillation, thus exposing the consumers to risk of methanol poisoning, w
hich confirms the need to submit their production to the control as extremely essential. The aim of this study to determination of methanol in some alcoholic beverage prepared by traditional local methods in order to verify conformity of local Alcohol Syrian standard specification. The samples were tested by using colorimetric method as official methods depending on the measurement using spectrophotometer at (575 nm).In comperation with the standard Syrian specifications number /2478/ year (2003), there were fifty test samples (Arak and Wine) collected from locally available. The study showed the amount of variation in the concentration of methanol depending on the difference in the method of preparation fermenting grapes. furthermore the importance of applying the control system to provide the quality of those popular spirits.
In this study, we review the possibility of production both ethanol and methanol from
OMW(OMW: Olive Mill Wastewater), fermented using pathogenic bacteria and isolated
marine bacteria. The results showed that when using Salmonella sp. bacteria, the
highest
values of methanol (5658.308 μg /l) appear at 7.5% concentration of the OMW, and the
higher concentration of ethanol (49.132 μg/l) at a concentration of 17.5% fermentation of
OMW. While Pseudomonas sp. produced the highest concentration of methanol (603.76μ
g/l) and ethanol (688.71μg /l) at 17.5% for OMW.
The results of this research showedthe ability of the bacteria isolated from sea water
in producing the above mentioned alcohols; for example the X3 bacteria displayed a direct
correlation between high concentrations of OMW (15 , 35 , 50)% and the high
concentrations of produced methanol (UL, 130.406μg/l, 1353.244μg/l ), apposite to
ethanol which was under the detection limits (under limited: UL).
Background: The Arak is a common alcoholic spirit in Syria, where it is produced in licensed enterprises and by some proud farmers that produce it from their grapes. However, this drink is often produced outside the controls of the manufacturing cycl
e in terms of fermentation and distillation, thus exposing the consumers to risk of methanol poisoning, which confirms the need to submit Arak’s production to the control as extremely essential.
Materials and Methods: This study is based on a database built on a series of investigations of alcohol poisoning cases; methanol was detected and rated according to the standard chemical methods, where the results have been analyzed and treated by the statistical analysis method used in pharmaceutical research.
Results: The study showed the amount of variation in the concentration of methanol depending on the difference in the method of preparation fermenting grapes between domestic and industrial way. It also showed the role of repeated distillation to reduce the concentration of this toxic substance Conclusion: The results of the analysis reveal the importance of treating the high concentrations of methanol by the repeated distillation process to reach the allowable value, furthermore the importance of applying the control system to provide the quality of this popular spirit.
This research study the effect of the proportion of the media (water - alcohol ) to determine where the arsenic used alcohol ( methanol _ ethanol _ propanol ) Using a Potentiometric method. It conducted the calibration process for the specific size o
f the solution studied a specific size of the standard solution of iodine Using a Potentiometric method , after the application of analytical conditions and technical optimal to determine arsenic , and then we studied the effect of mixing ratio on the detection limit for arsenic in mixed media (water _ Alcohol ) .
The study showed that the value of the detection limit of arsenic vary with the type of alcohol used and accounted for in the reaction medium , it reached to (1× 10-7 M) in media (75:25 water _ methanol ) , but when you use a media ( 75:25 water _ ethanol ) arrived to the limit of detection (1×10-4 M ), As for propanol arrived to the limit of detection (1×10-3 M).
where the value reached detection limit of arsenic to (1× 10-5 M) in media ( 50:50 water _ methanol ) , but when you use a media ( 50:50 water _ ethanol ) arrived to the limit of detection (1×10-3 M ), As for propanol arrived to the limit of detection (1×10-2 M).
The study showed that the use of the ratio ( 75:25 water _ alcohol ) gave a higher value limit of detection and therefore better results .
Was calculated as the standard deviation and standard deviation percentile confidence limit in addition to the feedback that indicates the efficiency of the method of determining the concentration of arsenic detection limit for each medium.
Raman spectra of Carbon Tetrachloride in Methanol solutions were
measured. Spectral lines n1 (symmetric stretch vibrations), n3 (asymmetric
stretch vibrations) of Carbon Tetrachloride were analyzed. The Raman spectra
were fitted using Peak-Fit sof
tware applying a sum of Gaussian and Lorentzian
components. Results indicate that, there is a clear difference in the behavior of
peak position and width of the two type of vibrations with varying the
structural composition of the surrounding environment due to varying of the
methanol concentration. On the other hand we found that a similarity in the
dependence of the intensity of spectral lines on the concentration of methanol,
with a high degree of non-linearity.
This research aims to study the effect of certain analytical
conditions to determine the arsenic in in mixed media (water _
alcohol ) where the user either alcohol ( methanol, ethanol ,
propanol using a Potentiometric, and then selected as conditi
ons
optimal certified for this determine. The effect of each of the (PH
value, type, concentration electrolyte, effect of crippling
electrolytes) to determine the arsenic in mixed media ( 50:50 water
_ alcohol ) and calibration using a standard solution of iodine.In
addition to that, there are technical conditions must be tuned to
determine the actual value of the end point calibration and data
processing of standard solution (initial velocity and deceleration
near the end point calibration). The study showed that the PH value
appropriate for calibration of arsenic with iodine (pH=8), also
found that the response process of arsenic on the electrode platinum
has been excellent when using NaHCO3 as electrolyte with
concentration of 1 M, which has been successfully used to quantify
arsenic As+3, where the value reached detection limit of arsenic to
(1×10-5M) in media (50:50water _ methanol ) , but when you use a
media ( 50:50 water _ ethanol ) arrived to the limit of detection
(1×10-3 M ), As for propanol arrived to the limit of detection (1×10-2 M). Was calculated as the standard deviation and standard
deviation percentile confidence limit in addition to the feedback
that indicates the efficiency of the method of determining the
concentration of arsenic and detection limit for each medium.
The dissolution rate of Iron and Titanium from Syrian basalt rock was
studied by hydrochloric acid, sulfuric acid, mixture of hydrochloric acid
methanol, sulfuric acid methanol solutions. The effects of temperature, time of
digesting and concentra
tions of acids have been investigated, the ratios of solid
to liquid and stirring speed were constant (S/L=0.02). It has been clear that
when the mixture of hydrochloric acid and methanol (100:50(V:V)
HCL:CH3OH) was used, the best dissolution for both iron and titanium was
obtained when we digested the rock and it took 6h at 100 ˚C where as the
concentration of hydrochloric acid and methanol were [HCl]=11M, [CH3OH]
=0.92M, the resulting ratios of dissolution of iron and titanium in the
mentioned conditions were 75.53%, 63.19 % respectively.
