58results about How to "Lower the starting temperature" patented technology

The invention discloses a method for preparing polyacrylic acid or sodium polyacrylate. The method comprises the following steps: 5 to 35 mass percent of crylic acid, 0 to 14 mass percent of sodium hydroxide, 0.5 to 6 mass percent of persulfate, 0.2 to 3 mass percent of sodium bisulfite , 0.05 to 3 mass percent of L-ascorbic acid, 0.5 to 10 mass percent of sodium hypophosphite and 50 to 90 mass percent of water are mixed to have polymerization reaction for over one hour at a temperature of between 25 and 60 DEG C to obtain the polyacrylic acid or the sodium polyacrylate; the viscosity-averagemolecular weight of the polyacrylic acid or the sodium polyacrylate is between 800 and 50,000; and the conversion rate of the polyacrylic acid or the sodium polyacrylate can reach over 96 percent. The method has the advantages that the polyacrylic acid or the sodium polyacrylate with low molecular weight is synthesized once, has low starting reaction temperature, less energy consumption, rapid reaction speed, high utilization efficiency of equipment, a simple process and convenient operation.

The invention relates to a preparation method of an organic polymer and in particular discloses a preparation method of polyacrylic acid or a copolymer thereof. The method comprises the following steps: firstly preparing 3-62% of acrylic acid or methacrylic acid, 0-48% of comonomers, 0.05-35% of sodium hypophosphite and 30-96% of water; mixing the prepared raw materials all together and stirring the mixture uniformly, placing the mixture in a 60Co gamma ray radiation field to undergo radiation-induced polymerization, with radiation dose of 1.2-30KGy and obtaining the polyacrylic acid or the copolymer thereof after polymerization; and neutralizing the prepared polyacrylic acid or the copolymer thereof in aqueous alkali until the pH value is 6.5-9, thus obtaining polyacrylate or copolymer salt thereof. The invention has the following advantages: the energy consumption is low, the equipment utilization ratio is high, the process is simple and the operation is convenient, chemical initiators are avoided, the product performance is excellent, the production safety and environment-friendliness are better and the product can serve as a dispersing agent, a scale inhibitor, a thickening agent, a flocculating agent, etc.

An adsorption-catalyst for treating phenol-containing wastewater, characterized in that Cu is used as an active component, K, Zn or Ce is used as an auxiliary component, activated carbon is used as a carrier, and its weight percentage is composed of: Cu1%-5%, auxiliary components 1%-5%, activated carbon 85%-98%, and the surface area of ​​activated carbon is 500-1500m2 / g. Prepared by equal volume co-impregnation method. The phenol-containing wastewater is passed through the adsorption-catalyst with activated carbon as the carrier. After the adsorption is completed, it is dried at room temperature, and the oxidizing gas is passed through to react. The adsorption-catalyst of the present invention has the advantages of good adsorption performance, mild catalytic oxidation conditions, low energy consumption, simple process, simple operation, in-situ catalytic oxidation, and no secondary pollution.