Preferred conformer assignments of diaryl sulfoxides employing aromatic solvent induced shifts

1975 ◽  
Vol 40 (20) ◽  
pp. 2993-2995 ◽  
Author(s):  
Slayton A. Evans ◽  
Andrew L. Ternay
Keyword(s):  
Aromatic Solvent

Aromatic solvent-induced shifts with benzene and hexafluorobenzene in 1H NMR spectra of para-bis-substituted benzenes

1975 ◽  
Vol 16 (44) ◽  
pp. 3811-3812 ◽  
Author(s):  
Kunio Nikki ◽  
Naoki Nakahata ◽  
Naoya Nakagawa
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
1H Nmr Spectra ◽  
Aromatic Solvent ◽  
Substituted Benzenes

scholarly journals RESEARCH OF COMPOSITION OF ANTIWEAR ADDITIVES FOR JET FUELS

2020 ◽  
Vol 64 (1) ◽  
pp. 79-84
Author(s):  
Alexandra K. Goryunova ◽  
Natalia M. Likhterova ◽  
Konstantin V. Shatalov ◽  
Elena A. Kletter
Keyword(s):  
Active Component ◽  
Unsaturated Fatty Acids ◽  
Import Substitution ◽  
Physicochemical Characteristics ◽  
Antiwear Additive ◽  
Gas Chromatography Mass Spectrometry ◽  
Antiwear Additives ◽  
Jet Fuels ◽  
Aromatic Solvent ◽  
Additive Formulation

In the framework of the state import substitution program for the development of a domestic antiwear additive for jet fuels the physicochemical characteristics of the approved foreign antiwear additives of DNK, HITEC 580 and Unicor J were analyzed at the first stage. The analysis revealed that using solvents during the production of HITEC 580 additives and Unicor J improve their consumer properties (low temperature characteristics). At the second stage of the study the composition of currently used additives HITEC 580 and Unicor J was studied by gas chromatography-mass spectrometry. It was shown, that the same active component is used in their composition - dimers of unsaturated fatty acids C18, namely a mixture of dimers of linolenic, linoleic and oleic acids, among which the dimer formed from linoleic and oleic acids prevails. An analysis of the solvents used in the additive composition showed that in the production of Unicor J additives they use an aromatic solvent containing 92% of monoaromatic compounds, mainly of the C10 series, which is probably the product of gasoline reforming, and HITEC 580 additives use an aliphatic solvent containing mainly n alkanes (41%). From the presented results of the study it follows that when developing a domestic antiwear additive formulation, it is necessary to choose compounds containing 1 or 2 carboxyl groups as the active component, and as the solvent either aromatic or aliphatic, depending on the cost and availability on the domestic market.

scholarly journals PLANT GROWTH REGULATORS BASED ON CYCLIC KETALS AND THEIR DERIVATIVES

2017 ◽  
Vol 60 (1) ◽  
pp. 95
Author(s):  
Gul’nara Z. Raskil’dina ◽  
Yulianna G. Borisova ◽  
Natalia N. Mikhaiylova ◽  
Semyon S. Zlotskiy ◽  
Louise M. Mryasova ◽  
...  
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Herbicidal Activity ◽  
Aromatic Solvent ◽  
Water Emulsion ◽  
Pea Seedlings ◽  
Dicotyledonous Plants ◽  
Physical And Chemical

 For citation:Raskil’dinaG.Z., BorisovaY.G., MikhailovaN.N., MryasovaL.M., KuznetsovV.M., ZlotskiyS.S. Plant growth regulators based on cyclic ketals and their derivatives. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 1. P. 95-101.Low toxicity of polyfunctional 1,3-dioxocyclicalkanes to soil bacteria allows to consider the compounds of this class as perspective herbicides. In this regard, we studied the herbicidal activity of a series of substituted cyclic ketals, their derivatives and alkenylmalonates. On the basis of commercially available triols the corresponding cyclic ketals were obtained with a yield more than 90%. O-alkylation of alcohol according to the methods led to the corresponding ethers and esters. The glycerol monoethers were obtained quantitatively by acid hydrolysis of ketals. Growth-regulatory activity of the synthesized compounds was determined in vitro on wheat and pea seedlings according to a known procedure (aromatic solvent - nefras A 150/330, surfactant - oxyethylated izononilfenol neonol AF-9-12). Evaluation of herbicidal activity of preparations was carried out in the laboratory. During 3 days length (L, mm) and weight (m, g) seedlings in comparison with the control option was measured. Without herbicide on seedlings the monocotyledonous and dicotyledonous plants are placed in Petri dishes containing water emulsion of active substances with a concentration of 5 mg / l and 10 mg / l for peas and 50 mg / l and 100 mg / l for wheat.  As a reference well-known herbicide, Oktapon Extra, was used. The diol with allyloxy-diol group showed the best results towards wheat. This compound successfully inhibits the increase in the length and weight of escape and gives close results to the standard. For peas, ketals and derivatives thereof are effective only in terms of inhibition of the shoot masses. Heterocyclic alcohol and glycols are superior to the standard, and a ketal at a concentration of 10 mg / l practically corresponds to it. Alkenylmalonates were more effective in inhibiting the escape weight wheat than peas. In particular, at a concentration of 100mg / l effectiveness of methallyl derivatives of trans-1,3-dichloropropene coincides to the standard. Physical and chemical characteristics of the compounds were proved by NMR and mass spectra. Screening results showed that activity of diol with allyloxy group is close to the ideal attitude to wheat. Ketals and their derivatives show the herbicidal activity only at inhibition of the mass escape of peas. Results of alkenylmalonates were better at inhibition of the mass escape of wheat than peas. The obtained results prove prospectivity of producing of herbicidal drugs based on the alkenylmalonates substituted diols and acetals, as a new generation of herbicides.

Effective Removal of Asphaltene Deposition in Metal-Capillary Tubes

SPE Journal ◽  
2016 ◽  
Vol 21 (05) ◽  
pp. 1747-1754 ◽  
Author(s):  
Sara M. Hashmi ◽  
Abbas Firoozabadi
Keyword(s):  
Organic Acid ◽  
Laboratory Scale ◽  
Asphaltene Precipitation ◽  
Aromatic Solvent ◽  
Benzene Sulfonic Acid ◽  
Chemical Treatments ◽  
Effective Removal ◽  
Dodecyl Benzene Sulfonic Acid ◽  
Asphaltene Deposition ◽  
Petroleum Fluid

Summary We describe asphaltene deposition and removal processes in metal capillaries. We induce asphaltene precipitation by adding an asphaltene precipitant, heptane, to a petroleum fluid. The mixture is then injected through a laboratory-scale capillary and allowed to deposit. We assess the reversal of the deposition by means of the use of two separate chemical treatments: (1) a strong organic acid surfactant and (2) an aromatic solvent. The strong organic acid surfactant, dodecyl benzene sulfonic acid (DBSA), was shown to completely dissolve asphaltenes by means of acid-base chemistry reactions at heteroatomic sites on the asphaltene molecules. We investigate the use of DBSA as an efficient removal agent, injecting it in a mixture of petroleum fluid after the deposit was already formed. An aromatic solvent, toluene, is also investigated in such a fashion to assess its ability in removing deposited asphaltenes. We find that DBSA can effectively remove asphaltene deposits within one pore-volume (PV) of injection and at concentrations roughly ten times less than that required by an aromatic solvent such as toluene. To the best of our knowledge, our current study is the first laboratory-scale investigation with surfactant chemicals to reverse asphaltene deposition in capillaries.

Modeling and Simulation of Asphaltene Inhibition and Remediation Using Aromatic Solvents

2021 ◽  
Author(s):  
Ali Abouie ◽  
Kamy Sepehrnoori
Keyword(s):  
Oil Fields ◽  
Asphaltene Precipitation ◽  
Chemical Additives ◽  
Aromatic Solvent ◽  
Solvent Injection ◽  
Intervention Cost ◽  
Gas Flooding ◽  
Pros And Cons ◽  
The Common ◽  
Side Track

Abstract Asphaltene precipitation and deposition occur in the reservoir, near-wellbore, inside the tubing, and production facilities during primary, secondary, or tertiary production. As more water-flooded oil fields produce under miscible gas flooding, this problem becomes more common around the world. If asphaltene deposition occurs in the reservoir or wellbore, it can severely affect the economics of the field in terms of production loss, intervention cost, and the requirement for chemical additives, if necessary. In some severe cases, intervention would be impossible and side-track well needs to be drilled. Hence, the best strategy for oil production in asphaltenic reservoirs is to control asphaltene precipitation and deposition through prevention and remediation jobs to minimize the number of well shut-ins, the downtime of the wells, and the associated cost. In this paper, we reviewed the common asphaltene prevention and remediation techniques along with their pros and cons. Since removing asphaltene deposits from the problematic wells is relatively expensive and sometimes requires substantial downtime of the well, we focused on one of the prevention techniques (i.e., continuous solvent injection through capillary injection string), which has become more popular, to control asphaltene precipitation in the wellbore. We obtained the physical properties of an aromatic solvent from literature and then characterized it as a component to be used with PC-SAFT EOS. Subsequently, we used the in-house wellbore model to evaluate the effectiveness of the continuous solvent injection with different injection rates on preventing asphaltene precipitation and deposition along the wellbore.

Relative ring current effects based on a new model for aromatic-solvent-induced shift

1989 ◽  
Vol 111 (17) ◽  
pp. 6544-6550 ◽  
Author(s):  
Helmut Stamm ◽  
Hannelore Jaeckel
Keyword(s):  
Ring Current ◽  
Aromatic Solvent ◽  
New Model

Studies on the distribution of N-phenylanthranilic acid in two-phase system: Aromatic solvent–water

Talanta ◽  
2006 ◽  
Vol 69 (3) ◽  
pp. 601-607 ◽  
Author(s):  
L ZAPALA ◽  
J KALEMBKIEWICZ
Keyword(s):  
Phase System ◽  
Two Phase ◽  
Aromatic Solvent ◽  
Solvent Water

Applications of the intermolecular nuclear Overhauser effect. II. The operation of solute-site factors in the interaction of polar solutes with the solvent benzene

1983 ◽  
Vol 36 (11) ◽  
pp. 2227 ◽  
Author(s):  
GR Smith ◽  
B Ternai
Keyword(s):  
Nuclear Overhauser Effect ◽  
Proton Relaxation ◽  
Relaxation Rates ◽  
Site Factors ◽  
Aromatic Solvent ◽  
Proton Proton ◽  
Solvent Interactions ◽  
Overhauser Effect ◽  
Polar Solutes ◽  
Nuclear Overhauser

By considering the technique involving the measurement of aromatic solvent-induced shifts, and the models which have been proposed from the results of such measurements, it is suggested that the use of the solvent-induced solute proton intermolecular relaxation rate [(1/T1)solvinter] is a better method to study local solvation of solute molecules. Proton relaxation rates obtained for simple solutes in the solvent benzene are analysed in terms of an interaction parameter I, which treats (1/T1)solvinter] in terms of a proton-proton pair distribution function. The resultant dependence between I and a calculated measure of the local polarity of the observed solute is discussed in terms of previously proposed models of solute-solvent interactions.

scholarly journals Aromatic Solvent-induced Shift(ASIS). I. An Interpretation Based on the Dipole-Quadrupole Interaction

1975 ◽  
Vol 48 (10) ◽  
pp. 2902-2906 ◽  
Author(s):  
Kunio Nikki ◽  
Naoya Nakagawa ◽  
Yoshito Takeuchi
Keyword(s):  
Quadrupole Interaction ◽  
Aromatic Solvent
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