3 results about "Ethoxypropionic acid" patented technology

The invention relates to a preparation method of 3-ethoxy isoamyl propionate, and belongs to the technical field of organic solvent synthesis. The preparation method of the 3-ethoxy isoamyl propionate comprises the following steps: S1, adding ethanol, a polymerization inhibitor and a catalyst A into a reaction kettle, heating to 40-55 DEG C, then dropwise adding ethyl acrylate, preserving heat, and carrying out addition reaction for 1-3 hours to obtain a reaction mixture; s2, adding an acidic material for neutralization, and carrying out vacuum rectification to obtain ethyl 3-ethoxypropionate; s3, adding ethyl 3-ethoxypropionate and a catalyst B into a reaction kettle, heating to 100-120 DEG C, introducing isoamyl alcohol, controlling the reaction temperature to 100-115 DEG C, and carrying out transesterification for 2.5-4 hours to obtain a crude product; and S4, cooling to stop the reaction, separating to remove the catalyst B, and carrying out reduced pressure rectification on the obtained crude product to obtain the 3-ethoxypropionic acid isoamyl ester. The method has the effects of mild process, high conversion rate and high product yield.

The application relates to the technical field of 3-ethoxypropionic acid ethyl ester preparation, and provides a 3-ethoxypropionic acid ethyl ester preparation device and a preparation method. The 3-ethoxypropionic acid ethyl ester preparation device comprises a thin film evaporator main body, a supporting shaft, a driving mechanism and a roller shaft. The thin film evaporator main body has an evaporation cavity, the supporting shaft is rotatably arranged in the evaporation cavity, the driving mechanism is connected with the power output end of the supporting shaft, and is used for driving the supporting shaft to rotate around the axis of the supporting shaft. The roller shaft is rotatably arranged on the supporting shaft around the axis of the roller shaft, and the roller shaft is in rolling cooperation with the inner wall of the evaporation cavity. The 3-ethoxypropionic acid ethyl ester preparation method uses the above-mentioned 3-ethoxypropionic acid ethyl ester preparation device to complete the evaporation and purification of 3-ethoxypropionic acid ethyl ester. The 3-ethoxypropionic acid ethyl ester preparation device and the preparation method can improve the technical problem that the evaporation and purification efficiency of 3-ethoxypropionic acid ethyl ester is low due to the non-uniformity of the thin film in the related art.

The application discloses a conjugated extended asymmetric viologen derivative, a preparation method and application thereof, and the viologen derivative comprises a compound shown in a general formula (I): wherein Ar is one of 1,4-phenylene, 1,5-naphthylene, anthracene, pyrene, tetramethylphenylene and tetrafluorophenylene; R1 is one of propionic acid, hexanoic acid, octanoic acid and 3-ethoxypropionic acid; and R2 is one of dodecyl, hexadecyl, octadecyl and 2-hexyldecyl. The application effectively solves the technical problems of a wide energy gap, a low conjugation degree, poor light emitting performance of a viologen electrochromic material in the prior art, and a fragile assembly structure and single performance of a viologen-pyrenium system.