36results about How to "Regulatory selectivity" patented technology

The invention relates to a control method and a control device for the moisture content of furfural in the extraction of the furfural and a method for preparing aromatic rubber oil. The method for preparing the aromatic rubber oil comprises the following steps of: mixing a part of furfural from a furfural drying tower with raw oil and enabling the mixture to enter the lower part of an extracting tower; mixing the other part of furfural from the furfural drying tower with water and enabling the mixture to enter the upper part of the extracting tower; carrying out counter-current contact on the two parts of materials in the extracting tower; and separating raffinate from overhead raffinate. By adopting the control method provided by the invention, the moisture content of the furfural entering the upper part of the extracting tower is controlled between more than 0.5 weight percent and 10 weight percent; and the raw oil is solvent refining extract oil or dewaxed oil of the solvent refining extract oil. The aromatic rubber oil prepared by adopting the method has high yield, the prepared aromatic rubber oil satisfies the directive requirements of European Union 2005 / 69 / EC, and the mass percent of polycyclic aromatic hydrocarbon is less than 3 percent.

The present invention provides a method for producing an N-acetyl dipeptide and an N-acetyl amino acid, comprising the step of reacting an amino acid with acetic anhydride or acetyl chloride to form an N-acetyl dipeptide and an N-acetyl amino acid.

The invention provides a system for Fischer-Tropsch synthesis, and a method for preparing low-carbon olefins from synthetic gas. The system for Fischer-Tropsch synthesis includes a fluidized bed reactor cylindrical shell, a gas-solid separator, a heat exchanger and a catalyst delivery tube; a product outlet is arranged at the top of the fluidized bed reactor cylindrical shell, and the product outlet is connected with the gas-solid separator; the gas-solid separator is provided with a solid product outlet, the solid product outlet is connected with one end of the catalyst delivery tube, and theother end of the catalyst delivery tube is connected with the bottom of the fluidized bed reactor cylindrical shell; and the heat exchanger is used to exchange heat with the delivery tube, and the heat exchanger and the delivery tube are arranged outside the fluidized bed reactor cylindrical shell. The system timely removes the reaction heat of a reactor, avoids the problems of abrasion of a catalyst and easy destruction of devices during heat removal, and recycles the removed heat.

The invention discloses a method for preparing methanol and dimethyl ether by using catalytic hydrolysis of methyl bromide in the presence of ZnO-SiO2-gamma-Al2O3. A catalytic hydrolysis reaction is carried out between methyl bromide and ZnO-SiO2-gamma-Al2O3 under normal pressure, wherein the amount of the catalyst is 3-10g; the reaction temperature is 100 to 260 DEG C; the molar ratio of H2O to CH3Br is 0.5-4; and the concentration CH3Br / N2 of methyl bromide is 0.5-1.2. The method has the advantages of low reaction temperature, low energy consumption and high conversion rate, the selectivity of the methanol and dimethyl ether can be adjusted by changing the reaction conditions, carbon dioxide is not produced, and the method is suitable for large-scale industrial production.