39results about How to "Low in free acids" patented technology

The invention provides a water-retaining organic fertilizer and a preparation method thereof, which belongs to the technical field of organic fertilizers. The method provided by the invention uses an edible vegetable blended oil bran cake as a main raw material for development of the water-retaining organic fertilizer, and the problems of existence of multiple harmful components caused by addition of chemical materials and single efficacy of products in traditional organic fertilizers are overcome. The water-retaining organic fertilizer is prepared from the edible vegetable blended oil bran cake, organic waste, a conditioning agent and a microbial inoculant. The preparation method comprises the following steps: crushing the edible vegetable blended oil bran cake and the organic waste; then mixing the crushed bran cake and organic waste with the conditioning agent and the microbial inoculant under stirring; and carrying out pool stacking fermentation, stripe-shaped stacking fermentation, screening and granulation so as to obtain the water-retaining organic fertilizer. According to the invention, because of usage of organic matter raw materials containing abundant mycoprotein, the organic fertilizer has a water-retaining function, and the problem of reduced output or poor output of crops caused by lack of water, no retention of water and fertility, no drought tolerance and loss of nutrients in agricultural production is overcome.

The invention discloses a preparation method of hydroxylamine sulphate. The preparation method comprises the following steps: 1), evenly mixing the raw materials of an acid solution and oxime, rectifying in a reaction rectifying column, obtaining a mixed solution of hydroxylamine sulphate and unreacted oxime and acid in a column reactor; 2), conveying part of the mixed solution obtained in the column reactor to a stripping tower through a pump, stripping to remove an organic matter and part of water, conveying part of the mixed solution to a reactor filled with a catalyst to have a further reaction; enabling a liquid material obtained in the reaction to return to the column reactor of the rectifying column, and enabling a gaseous phase to return to the upper middle part of the rectifying column; 3), crystalizing a concentrated hydroxylamine sulphate solution flowing out from a tower kettle of the stripping tower, separating the liquid and the solid, and drying to obtain hydroxylamine sulphate.

The invention provides a method for preparinglactide by using lactic acidoligomer. The method comprises the steps that the lactic acidoligomer and an active compound perform mixed reaction, and the lactide is obtained through cracking reaction; the active compound is organic matter capable of reacting with a terminal hydroxyl group or terminal carboxyl group of the lactic acidoligomer. Compared with the prior art, the cracking activity of the oligomer is not affected while the molecular weight of the lactic acidoligomeris increased by utilizing reaction between the active compoundand the terminal hydroxyl group or terminal carboxyl group of the lactic acidoligomer, the technical process is simple, and the free acid content of the obtained lactide is far lower than that of the lactide obtained by directing cracking the lactic acidoligomer. In addition, the lactide yield is equivalent to the yield of the lactide obtained by directing cracking the lactic acidoligomer.

The invention provides a method for refining glycolide and glycolide obtained by the method. The method comprises the following steps: carrying out impurity extraction on crude glycolide by using a solvent A, and recrystallizing by using a solvent B, wherein the solvent A comprises at least two solvents which are mutually soluble. According to the method disclosed by the invention, two polar solvents are used for refining the crude glycolide, a very good extraction effect is achieved on acidic impurities such as glycolic acid oligomer and the like, and the solvents are easily and fully removed in solid-liquid separation and drying processes, so that the problem of solvent residue in a refined product is solved, and the technical effect of low free acid content of the product is achieved. The technical scheme of the invention has the technical advantages of easy solvent recovery and low free acid content of the product.

The invention belongs to the technical field of chemical engineering and particularly relates to barium stearate and a preparation process thereof. Barium stearate is prepared from glyceryl tristearate, a catalyst A, antioxidant, water, barium hydroxide, a catalyst B and sodium hydroxide. The catalyst A is a mixture of magnesium oxide and Al2O3-MgO, and the antioxidant is a mixture of antioxidant DLTDP and antioxidant T501. The catalyst B is selected from one or more of peroxide. Barium stearate is low in raw material cost, high in yield, low in free acid content and stable in performance, and relevant quality indexes meet the requirements of the People's Republic of China chemical industry standard <HG/T2338-1992 barium stearate (light)> for superior products. According to the preparation process of barium stearate, the production course is safe and environmentally friendly, energy consumption is low, the total production cost is low, and higher practicality and comparability are achieved compared with similar products on the market in practical application.

The invention relates to an electroplating heavy metal ion back-tank sodium removing process, which comprises the following steps: collecting electroplating heavy metal ion wastewater, carrying out rough filtration and fine filtration, and enabling a heavy metal ion solution to pass through a sodium type weak acid cation exchange resin column to exchange and adsorb heavy metal ions; and after the adsorption is saturated, eluting the cation exchange column by dilute acid and concentrated acid respectively, collecting effluent of heavy metal ions, and concentrating and returning theeffluent of heavy metal ions to an electroplating process line for use. The method can greatly reduce the concentration of sodium ions and free acid in the bath return liquid, and meets the use stability of electroplating heavy metal ions in the bath return.

The invention relates to a rinsing system and rinsing method for cold-rolled strip steel pickling. The rinsing system comprises a desalted water tank communicating with a fourth double-spray pipe, wherein a fourth circulating pump communicates with a fourth three-spray pipe through a fourth pipeline and communicates with a third double-spray pipe through a fourth branch pipeline; a third circulating pump communicates with a third three-spray pipe through a third pipeline and communicates with a second double-spray pipe through a third branch pipeline; a second circulating pump communicates with a second three-spray pipe through a second pipeline and communicates with a first double-spray pipe through a second branch pipeline; a first circulating pump communicates with a first three-spray pipe through a first pipeline and communicates with a flushing water tank through a first branch pipeline; a sixth circulating pump is arranged between the flushing water tank and a deacidification and regeneration room; and the heights of separating walls between every two adjacent rinsing tanks are the same. According to the rinsing system and the rinsing method, the number of stages of rinsing is increased, the use amount of rinsing water is reduced, digestion in an acid regeneration room is facilitated, and waste caused by excessive water discharge is avoided.