31results about How to "Uniform hydrolysis" patented technology

The invention provides an industrial production method of icodextrin. The industrial production method comprises steps as follows: a, an acid solution with the concentration of 0.3%-1.5% is prepared; b, 1,000 parts by weight of the acid solution are taken, 400-450 parts by weight of corn starch are added to the acid solution during stirring, the mixture has a hydrolysis reaction for 1-2 h at the hydrolysis temperature of 90-95 DEG C, and then pH is regulated to 5-7, and a hydrolysis product is obtained; c, the hydrolysis product prepared in the step b is cooled to 55-60 DEG C, 12-13.5 parts by weight of activated carbon is added, decoloration is performed for 0.5-1 h, and filtration is performed after decoloration; d, a filtrate prepared in the step c is subjected to ultrafiltration and drying, and icodextrin is obtained. According to the industrial production method of icodextrin, the preparation process is simple, the production cost is low, a prepared product has good quality, and the industrial production method is applicable to industrial mass production of icodextrin.

The invention discloses a method for controlling the particle diameter of decorative body paper titanium dioxide, and belongs to the technical field of decorative body paper titanium dioxide. Through the control of a hydrolysis working procedure, the method comprises the following steps: A: selecting titanium sulfate solution, preheating to 96-98 DEG C for standby use, and preheating desalted water to be boiling for standby use; B: firstly, adding the desalted water which is preheated to be boiling into a hydrolysis reactor to be stirred, then, adding the preheated titanium sulfate solution, stirring after the titanium sulfate solution finishes adding, and heating to raise temperature to slight boiling; C: after a hydrolysis rate of step B achieves 50-65%, stopping stirring and heating, and carrying out curing; D: after curing is carried out, stirring again, heating and raising temperature to slight boiling, and carrying out hydrolysis for 160-180min; E: adding the boiling desalted water, controlling total titanium concentration TiO2 in slurry to be 160-180g / L, keeping the slight boiling, and carrying out hydrolysis for 50-60min. According to the method disclosed by the invention, a titanium sulfate solution pyrohydrolysis technology is implemented by meeting body paper requirements, water and titanium dioxide particle diameter are even, and the method conforms to the hydrolysis technology specially designed for the particle diameter requirement of the decorative body paper titanium dioxide.

A kind of TiO 2 / WO 3 The preparation method of composite powder is to mix titanium sulfate, urea, ethanol, and deionized water evenly, then add acetylacetone, and stir evenly at room temperature to obtain solution A; add concentrated nitric acid to solution A to obtain solution B; K is 0.1~0.3mol / L 2 WO 4 aqueous solution, and then adjust the pH value to 1 to 3.5 to obtain solution C; mix solution B and solution C for hydrothermal reaction to obtain TiO 2 / WO 3 Composite powder. In the present invention, due to titanium sulfate, K 2 WO 4 ·2H 2 O and the like are raw materials, and the price is low, so the preparation cost is low. In the present invention, a solution containing Ti and W is prepared first, and the product can be obtained by a one-step hydrothermal method, which has the advantages of low reaction temperature and short cycle. Due to the adoption of the hydrothermal method, the present invention can prepare TiO with controllable morphology, high purity, fine particles and relatively uniform particle size. 2 / WO 3 Composite powder.

The invention discloses a hydrophobic association polymer and a synthesis process, which is characterized in that the parts by weight of each raw material are: 320-360 parts of pure water, 0.25-0.75 parts of disodium ethylenediamine tetraacetate (Edta-2Na), baking soda 25-35 parts, 18-22 parts of acrylic acid, 12-18 parts of potassium chloride, 95-105 parts of acrylamide, 15-20 parts of urea, 25-30 parts of monomer, among which, Edta-2Na sand-carrying property 2±0.1 h settlement is less than 20%, dry powder 0.25% viscosity 21‑27. Compared with the above-mentioned prior art, the invention has simple operation, low production cost, stable product quality and extremely low impact on environmental pollution. At the same time, the invention has the advantages of wide source of raw materials, simple production operation, low cost, and little impact on the environment; stable product quality, good solubility, temperature and salt resistance, shear resistance, high viscosity, etc., and can be applied to medium and low temperature oil and gas reservoir fracturing Construction and EOR.

The invention discloses a preparation method of nano zirconium dioxide, which belongs to the technical field of nano material preparation. Mix the zirconium alkoxide mixture with ethylene glycol at a mass ratio of 1:1 to 2:1, and add the modified nanofiber membrane 0.2 to 0.4 times the mass of the zirconium alkoxide mixture and 0.01 to 0.02 times the mass of the zirconium alkoxide mixture Sulfuric acid, after stirring and reacting, filtering, washing, and drying to obtain nano-zirconia blanks; calcining nano-zirconia blanks to obtain pretreated nano-zirconia, and pre-treated nano-zirconia and sodium hydroxide solution according to the mass ratio 1:5~1:10 mixing, filtering, washing until the washing liquid is neutral, drying to obtain nano zirconia. The particle size distribution range of nano zirconium dioxide obtained in the present invention is narrow, and has a small size, so it has excellent dispersibility and is not easy to agglomerate in the preparation process.