32results about How to "Short process reaction time" patented technology

The invention discloses an acidic iron-containing wastewater recycling system comprising a pickling wastewater storage pool, wherein the pickling wastewater storage pool is connected with a neutral oxidation reaction tank through a raw water acid proof pump, and a stirrer, a 1# online pH meter and a 1# online ORP (oxidation reduction potential) meter are fixed in the neutral oxidation reaction tank; an alkali liquor storage tank is connected with the neutral oxidation reaction tank through a 1# metering pump; a flocculant storage tank is connected with the neutral oxidation reaction tank through a 2# metering pump; the neutral oxidation reaction tank is connected with a settling tank through a slurry pump, the settling tank is connected with a sludge concentration tank, and a supernatant drain pipe is further connected to the settling tank; the sludge concentration tank is connected with a high pressure plate frame filter press through a high pressure slurry pump; and the neutral oxidation reaction tank is further connected with a blower. The invention further discloses an in situ modification method for treating wastewater by the acidic iron-containing wastewater recycling system. By adopting the acidic iron-containing wastewater recycling system disclosed by the invention, more than 55% of Fe3O4 can be stably prepared and recycled through in-situ reaction in an acidic wastewater neutralization tank under normal temperature and normal pressure conditions.

The invention belongs to the field of organic synthesis and particularly relates to a clean synthesis method for di-tert-butyl disulfide, which comprises the following steps: adding tert-butyl mercaptan, a catalyst and a solvent, i.e. acetone, into a reactor container, or only adding the tert-butyl mercaptan and the catalyst into the reactor container firstly and then adding an oxidizer, i.e. oxyful, or a mixture of acetone and oxyful into the reactor container with stirring; controlling a reaction temperature between minus 20 DEG C and 70 DEG C to perform a reaction sufficiently; after the reaction is completed, post-processing the obtained product to obtain the di-tert-butyl disulfide, wherein the catalyst is cuprous chloride, copper chloride or a mixture of the cuprous chloride and thecopper chloride in random mass proportion. The invention meets the requirement for clean production. The catalyst and the reaction solvent have low price, can be conveniently recycled, have small usage in the reaction and have excellent catalytic performance. Meanwhile, the process has short reaction time, the conversion rate of the tert-butyl mercaptan reaches 98 to 100 percent, the selectivity of the di-tert-butyl disulfide is between 90 and 96 percent, the reaction yield is high and the clean synthesis method is suitable for industrial production.

The invention discloses a method for continuously preparing rosuvastatin intermediates by adopting a microchannel modular reaction device. The isopropanol solution of p-fluorobenzaldehyde and the isopropanol solution of methyl isobutyryl acetate are prepared in acetic acid and piperidine Under catalysis, react in the first microreactor to generate the first product; the first product and the free isopropanol solution of S-methyl isothiourate react in the second microreactor to generate the second product; the second The product is reacted with an acetone solution of potassium permanganate and acetic acid in the third microreactor to obtain the third product; finally the third product is reacted with methylamine ethanol solution in the fourth microreactor to obtain the rosuvastatin intermediate. The invention has low toxicity and pollution, low production cost, good product quality, high profit, environmental protection, energy saving and high efficiency, and has the potential of industrial scale-up.

The invention discloses an oxapium iodide preparation method. The method comprises the steps of S1, preparing 2-phenyl-2-hexamethylene-4-methanol-1,3-dioxolane, S2, preparing 2-phenyl-2-hexamethylene-4-piperidinemethyl-1, 3-dioxolane, and S3, preparing the oxapium iodide. The step S1 comprises the steps of mixing uniformly cyclohexyl phenyl ketone, glycerol, Amberlyst-15 exchange resin and allochroic silicagel, heating, maintaining the temperature, stirring, filtering, taking the filtered solution, adding saturated sodium hydrogen carbonate aqueous solution for washing, keeping static, taking organic layer, drying, releasing pressure, distilling to acquire material A, purifying material A, drying to acquire 2-phenyl-2-hexamethylene-4-methanol-1, 3-dioxolane. The method has the advantages of being mild in reaction condition, simple in operation, suitable for industrialized production, low in material toxicity, easy and cheap for material access, low in cost and good in comprehensive yield rate.

The invention discloses a preparation method for a styrene-diolefin special copolymer. The preparation method comprises the following steps: taking a styrene-diolefin block random copolymer as PS-PB-PB / PS-PS; wherein PS representing a styrene copolymer block, PB representing a diolefin copolymer block, and PB / PS representing a styrene-diolefin random copolymer block; and adopting an anionic continuous polymerization method. The preparation method avoids the defects of a batch still and is characterized by low production cost, short production cycle, low operating cost, short reaction time andhigh yield.