42results about How to "Shorten the oxidation reaction time" patented technology

The invention relates to desulfurating method for the straight-run diesel oil by the oxidation. The nitrate acid which is 35-70%wt is the oxidant the volume ration of the straight-run diesel oil and the oxidant is 100:5-50. The reaction temperature is 40-80DEG C and the time is 1-30min. The oxidant after reaction can be recovered. The diesel oil product can be got after the extraction, the filtering and adsorption. The processes can desulphurate and deacidification at the same time, so it has the low cost according to the hydrotreating for the FCC diesel oil and the devulcanization by the H2O2.

The invention discloses a method for preparing sodium dichromate by sodium-based molten salt oxidation continuous carbonization, belonging to the technical field of sodium dichromate. The method comprises the following steps of: (A) mixing materials: mixing chromite powder or ferrochromium powder, sodium-based alkali compound, sodium dichromate and reclaimed materials to form raw material; (B) oxidizing roasting: adding the raw material into a rotary kiln to form molten state and take oxidation reaction, wherein the draw ratio of the rotary kiln is 3-6; (C) leaching: conveying the molten salt into a granulator through a discharge chute to perform granulating and water quenching, and separating slurry to get the sodium chromate solution; (D) carbonization: neutralizing the sodium chromate solution and removing the aluminum from the sodium chromate solution to get the sodium chromate neutral solution; evaporating the sodium chromate neutral solution for concentration, dosing, and then, taking carbonization reaction in a continuous carbonization tower, treating the carbonized liquid with solid-liquid separation to get the carbonized clear liquid, and evaporating and crystallizing the carbonized clear liquid to get the sodium dichromate after separation. The method can effectively prevent accidents, such as accretion, improves the production rate of the kiln, improves the utilization rate of sodium resource by more than 50% and greatly improves the product quality of the sodium dichromate.

The invention discloses a method for preparing p-cyanobenzoic acid. The method comprises the following steps: taking 4-chloromethylbenzonitrile as a raw material and hydrolyzing to obtain 4-cyanobenzyl alcohol as an intermediate product under alkaline conditions, adding a phase transfer catalyst, an activator, an oxidant and a catalyst, and carrying out an oxidation reaction for 4 to 15h at a temperature of 50 to 100 DEG C to obtain a final product. The specific phase transfer catalyst and the catalyst are used and salts are added to be used as the activator of the phase transfer catalyst in the oxidation reaction, so that the oxidation reaction time of the 4-cyanobenzyl alcohol as the intermediate product is shortened to 6 to 10 hours, the yield of the 4-chloromethylbenzonitrile as the final product reaches to 86.4% or more, and the purity reaches to 98.6% or more. The method is safe, non-polluting, simple to operate and high in purity, and is a new method suitable for green chemistryapplication.