Absorption Of CS2 Research Articles

Screening of Absorbents for Viscose Fiber CS2 Waste Air and Absorption–Desorption Process

Screening of absorbents is essential for improving the removal rate of carbon disulfide (CS2) waste air by absorption. In this work, the UNIFAC model in Aspen Plus was utilized to calculate the excess Gibbs function and absorption potential of the binary system of CS2 with various alcohols, ethers, esters, amines, and aromatic hydrocarbons. The results were used to quantitatively compare the efficiency of each solvent for CS2 absorption. The theoretical predictions were then verified by absorption experiments in a packed tower. The results showed that the performance of various solvents to CS2 roughly followed the order of esters < alcohols < amines < heavy aromatics < glycol ethers. Meanwhile, N-methyl-2-pyrrolidone (NMP) is the optimal absorbent for CS2 waste air treatment. Additionally, the process parameters of absorption and desorption of NMP were optimized. The results illustrated that the average mass removal efficiency of CS2 by NMP is 95.2% under following conditions: liquid–gas ratio of 3.75 L·m−3, a temperature of 20 °C, and inlet concentration lower than 10,000 mg·m−3. Under the conditions of 115 °C, 10 kPa, and a desorption time of 45 min, the average desorption rate of CS2 is 99.6%, and the average water content after desorption is 0.39%. Furthermore, the recycled lean liquid can maintain an excellent CS2 purification effect during the recycling process.

Nonlinear absorption of CS2 at the wavelength of 400 nm with femtosecond pulses

Nonlinear absorption of carbon disulfide (CS2) was investigated by Z-scan technique and time-resolved pump–probe technique with femtosecond pulses at 400nm wavelength. By the two techniques, we confirmed that the nonlinear absorption of CS2 arise from a combination of two-photon absorption (TPA) and the excited state absorption induced by TPA under the incident laser pulses with 400nm wavelength. The coefficient of TPA, the absorption cross-section of low excited state and lifetime of low excited state were obtained by theoretical fitting the experimental results. The results indicated that the CS2 has good optical limiting capability at 400nm wavelength.

Carbon disulfide neurotoxicity: Taiwan experience.

Carbon disulfide (CS2) intoxication may induce peripheral neuropathy, encephalopathy, and cardiovascular diseases. In our studies, abnormalities of the peripheral nerves including clinical symptoms and electrophysiological findings were still present 3 years after cessation of CS2 exposure. The data indicate that CS2 neuropathy may persist for a period of time. The involvement of central nervous system may continue even longer. Brain magnetic resonance images usually show multiple high signal intensities in the basal ganglia and subcortical white matter suggesting a vascular event particularly in the small vessels. In addition, a patient with diffuse demyelination in the cerebral hemispheres also showed a diffuse decrease of regional cerebral blood flow indicating a microangiopathy. Therefore, CS2 exposure should be considered as a risk factor for strokes and one of the causes for diffuse leucoencephalopathy. Because CS2 may induce parkinsonian features, a differential diagnosis between CS2 parkinsonism and idiopathic parkinsonism is important. In our study, dopamine transporter with 99mTc-TRODAT-1 brain single photon emission computed tomography showed a normal uptake in the corpus striatum. The data suggest a normal presynaptic dopaminergic pathway function and provide useful information in differentiation. The involvement of cardiovascular systems may be due to thrombotic effects rather than atherogenic effects. In addition, absorption of CS2 through skin is also significant particularly in workers with skin lesions.

Intensity-Dependent Infrared Absorption in CS2 near 10 μm

Intensity-Dependent Infrared Absorption in CS2 near 10 μm

Quantitative determination of absorption and elimination of carbon disulfide through different channels in human body.

Human experiments were performed on six volunteers, who had never experienced CS2 absorption, with different concentrations of carbon disulfide (CS2) from 28 ppm to 52 ppm which were inhaled for 30 to 120 minutes continuously, and CS2 concentration was kept at a constant level during the period of each experiment. Amounts of CS2 retained in the body and eliminated from it by the expired air, the skin, and the urine were calculated. During the period of each inhalation experiment, the volunteers were free from any signs, except a slight headache. The results are summarized as follows: 1. The percentage of CS2 concentration in the expired air to that in the inspired rises gradually for the first 40 minutes and reaches an equilibrium at 65 ± 10 per cent. 2. When the inhalation of CS2 is discontinued, CS2 level in the expired air rapidly goes down in fresh air, and the average percentage of CS2 concentration in the expired air to that in the air which has been inhaled is 18 ± 5, 8 ± 2 and 4 ± 2 per cent at the interval of every 10 minutes. The decrease presents the geometrical series. 3. The amount of CS2 absorbed during the inhalation is calculated to be from 15.4 mg to 29.6 mg (average 23.0 mg), of which 1.74 mg to 7.58 mg (average 4.82 mg) is eliminated by the expired air, while the amount of CS2 excreted in the urine is from 7.2 γ to 37.3 γ (average 16.5 γ). 4. CS2 is proved to be eliminated through the skin in the amount of 36.2 γ to 77.8 γ. This is about three times as much as that eliminated by the urine, and it is about 1% of the amount eliminated by the respiratory tract. 5. The balance sheet of CS2 in the body is prepared and described, taking into account the absorption, on the one hand, and the elimination, on the other, of gaseous CS2 through the respiratory tract, the skin, and the urine.