- Standard enthalpy of formation of 2-chloro-6-(trichloromethyl)pyridine
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The standard enthalpy of formation of 2-chloro-6-(trichloromethyl)pyridine(cr) was determined to be -(55.4 +/- 1.8) kJ * mol-1 at 298.15 K by rotating-bomb oxygen combustion calorimetry using paraffin oil as a combustion aid and As2O3(aq) as a reducing agent for Cl2 formed.Nitric acid and chlorometallic acids of noble metals present in the final bomb solution were analysed by ion-chromatographic and atomic-absorption spectrometric methods, respectively.The effect of catalytic pre-oxidation of As2O3(aq) was evaluated.The standard molar energy of combustion was calculated using a computation form derived by combining that for CHON compounds with that for CHOCl compounds.The modifications of the form are described.
- Tan, Zhi-Cheng,Kamaguchi, Akeji,Nagano, Yatsuhisa,Sakiyama, Minoru
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- Method for preparing 2-chloro-6-trichloromethylpyridine through liquid phase photochlorination of 2-methylpyridine
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The present invention relates to a method for preparing 2-chloro-6-trichloromethylpyridine with product purity greater than or equal to 99.0% by using trifluoromethyl chlorobenzene as a solvent for reaction between 2-methylpyridine with chlorine gas, in which 2-methylpyridine and chlorine gas are used as starting materials, trifluoromethyl chlorobenzene is used as a solvent, 2-methylpyridine is prepared into a liquid raw material by using the solvent trifluoromethyl chlorobenzene, and the liquid raw material is continuously fed to perform liquid phase photochlorination reaction at temperature of 160-240° C. under irradiation of ultraviolet light to obtain 2-chloro-6-trichloromethylpyridine solution. Advantages: the selectivity of reaction for the production of 2-chloro-6-trichloromethylpyridine is improved, the content of components such as isomers and pentachloromethylpyridine in the crude product is decreased significantly, the crude product is easy to be purified to obtain the 2-chloro-6-trichloromethylpyridine product with purity greater than or equal to 99.0%, and the industrial production is facilitated; and secondly, not only can the reuse of the separated solvent in the preparation process of the 2,6-dichloropyridine product with purity greater than or equal to 99.0% be realized, but also the purposes of low pollution, low energy consumption and low cost in the preparation process are realized.
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Page/Page column 3-8
(2020/03/18)
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- Preparation method for 2-chloro-6-trichloromethylpyridine and catalyst thereof and preparation method for catalyst
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The invention discloses a preparation method for 2-chloro-6-trichloromethylpyridine and a catalyst thereof and a preparation method for the catalyst, and belongs to the field of the 2-chloro-6-trichloromethylpyridine. The catalyst for preparing the 2-chloro-6-trichloromethylpyridine comprises a carrier and iron-containing pyridine chlorine salt ionic liquid, and the iron-containing pyridine chlorine salt ionic liquid is loaded on the carrier. The catalyst is capable of, through loading the iron-containing pyridine chlorine salt ionic liquid on the carrier, greatly improving a contact area of the catalyst of a reactant, and improving a preparation efficiency of the 2-chloro-6-trichloromethylpyridine. In addition, the invention further relates to the preparation method for the catalyst for preparing the above 2-chloro-6-trichloromethylpyridine and the preparation method for the 2-chloro-6-trichloromethylpyridine. Defects existing in a traditional 2-chloro-6-trichloromethylpyridine preparation method that a reaction temperature is overhigh, the yield of a finished product is low and the catalyst is not easy to regenerate because of deactivation are overcome.
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Paragraph 0043-0057
(2018/10/19)
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- 6-CHLORO-2-TRICHLOROMETHYL PYRIDINE PREPARATION METHOD
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The present invention discloses a preparation method for 6-chloro-2-trichloromethyl pyridine, in which 2-methyl pyridine hydrochloride or 2-chloromethyl pyridine is used as an initiator and a considerably excess amount of chlorine gas reacts with 2-methyl pyridine hydrochloride or 2-chloromethyl pyridine at a high temperature to form purer 6-chloro-2-trichloromethyl pyridine. The present invention provides a highly selective, high-yield and improved environmental-ly protective method.
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Page/Page column 3; 4; 5
(2010/04/23)
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- STRONG CHLORINATION OF 2-PICOLINE
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The strong thermal and photochemical chlorination of 2-picoline hydrochloride at 80-150 deg.C was investigated.It occurs with change in the phase state of the reaction mixture.Among the chlorination products there were 17 compounds, 15 of which were isolated and identified.The main factor affecting the degree of chlorination is temperature, with increase in which the limiting degree of chlorination in the investigated range decreases.The penta-, hexa-, and heptachloro derivatives are formed mainly by initial chlorination of the pyridine ring with subsequent chlorination of the methyl group.
- Kosorotov, V. I.,Stul', B. Ya.,Dzhagatspanyan, R. B.
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p. 1845 - 1851
(2007/10/02)
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