- Micro-channel continuous heterogeneous sulfonation reaction device and method
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The invention relates to the technical field of sulfonation reaction, in particular to a micro-channel continuous heterogeneous sulfonation reaction device and method. The device comprises a raw material liquid tank, a metering constant-flux pump, a micro-channel strong mixer, a heating heat exchanger, a sulfonation micro-channel reaction unit, a cooling heat exchanger and a liquid storage tank which are sequentially connected in series, wherein a back pressure valve is arranged on a pipeline between the cooling heat exchanger and the liquid storage tank; the lower end of the liquid storage tank is connected with the raw material liquid tank through a return pipeline, an adjusting discharging valve is arranged at the end, connected with the liquid storage tank, of the return pipeline, thenitrogen cylinder is connected with a connecting pipeline between the metering advection pump and the micro-channel strong mixer through a first gas pipeline, and the nitrogen cylinder is connected with the raw material liquid tank through a second gas pipeline. Sodium sulfite is used as a sulfonating agent, so that the problem of mixed mass transfer can be effectively solved, the reaction time can be greatly shortened, the safety is ensured, the reaction conversion rate and selectivity are improved on the basis of an intermittent process, and a new way is provided for sulfonation reaction.
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Paragraph 0041-0043
(2020/05/14)
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- Leave-in color conditioner
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The invention is directed to novel hair dye compositions, novel leave-in conditioners, and novel leave-in conditioners with a hair coloring effect. Hair dye compositions, leave-in conditioners, and leave-in conditioners with hair coloring effect may include a styrene/vinylpyrrolidone copolymer emulsion.
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- Structure-stability correlations for imine formation in aqueous solution
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Imine formation between 25 aldehydes and 13 amines in aqueous solution in the pH range 7-11 was studied by 1H NMR spectroscopy. A three-parameter linear equation correlating logarithms of imine formation constants with pKa and HOMO energies of amines and LUMO energies of aldehydes is proposed. In view of the widespread occurrence of imine-forming processes in both chemistry and biology, the data presented are of significance for physical organic chemistry and of particular interest for dynamic combinatorial chemistry. Copyright
- Godoy-Alcantar,Yatsimirsky, Anatoly K.,Lehn
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p. 979 - 985
(2007/10/03)
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