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

The invention belongs to the technical field of chemical industry, and particularly relates to a technique for synthesizing zinc stearate from glyceryl tristearate. The technique comprises the following steps: 1) hydrolyzing glyceryl tristearate and water under the actions of a catalyst and an antioxidant; and 2) adding zinc oxide and a catalyst in multiple steps, and carrying out condensation, dewatering and salification to synthesize the zinc stearate. By using the technique provided by the invention, no wastewater containing chlorine and sulfate ions is discharged in the process; the production process is safe and environment-friendly and has low total production cost; and the synthesized zinc stearate has the advantages of high yield, favorable color and low free fatty acid content, satisfies the relevant quality standard for Type I zinc stearate in HG / T3667-2012, and has higher practicality and comparability than like products in the market in practical application.

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 belongs to the technical field of feed, in particular to a method for producing calcium phosphate salt and high-purity gypsum by using hydrochloric acid and phosphate rock. The technical problem to be solved by the present invention is to provide a method for producing calcium phosphate salt and high-purity gypsum by using hydrochloric acid and phosphate rock, comprising the following steps: incompletely decomposing the phosphate rock with hydrochloric acid, and separating solid and liquid to obtain solid 1 and liquid 1; 1. Treatment of solid 1: solid 1 is reacted with hydrochloric acid, filtered and separated to obtain filter residue and filtrate 2; filtrate 2 is mixed with phosphoric acid to obtain fine seasoning slurry, and the refined seasoning slurry is dechlorinated, defluorinated, and dehydrated by heating to obtain calcium phosphate; B 1. Treatment of liquid 1: ① remove fluorine in liquid 1; ② add calcium to obtain calcium hydrogen phosphate; ③ remove magnesium; ④ add sulfuric acid to obtain high-purity gypsum. The method of the invention has simple steps and low cost, and the prepared calcium phosphate fully meets the national standard, and the obtained gypsum has excellent quality.

The invention belongs to the technical field of chemical engineering, and particularly relates to high-quality zinc stearate prepared from glyceryl tristearate. A preparation technology of zinc stearate comprises the following steps that 1, glyceryl tristearate and water are hydrolyzed under the action of a catalyst and an antioxidant; 2, zinc oxide and a catalyst are added stepwise, condensing, dewatering and salt forming are conducted, and zinc stearate is synthesized. Zinc stearate is high in preparation yield, good in color and cluster, low in free acid content and stable in quality, and the related quality indexes meet the related requirements on I type zinc stearate in HG / T3667-2012; in addition, no wastewater containing chlorine and sulfate ions is discharged in the preparation process of zinc stearate, the production process is safe and environmentally friendly, and the total production cost is low. Zinc stearate is high in quality and has the better practicability and comparability compared with similar products on the market in practical application.

The invention discloses an activated clay dry preparation process and a special device. According to the process, calcium bentonite with the content of montmorillonite higher than 70% is selected as araw material, and minimum acid dosage is controlled. Compared with traditional superior high temperature kneading reaction, residual free acid is neutralized by amphoteric oxides, and main indicatorssuch as activity degree and color removal ratio of activated clay cannot be affected by salt formed after neutralization. Used water is less in the production process, a washing process is omitted, waste water, waste gas and waste are omitted, any environmental pollution is omitted, emission is omitted in the production process, green and environment-friendly production is achieved, and the activated clay dry preparation process is environmentally friendly.

The invention relates to industrial waste slag comprehensive utilization technologies, and specifically relates to a method for preparing sodium fluosilicate by using fluorine-containing silicon slag. The method comprises: fulling mixing the fluorine-containing silicon slag and sodium hydroxide with a concentration of 5% to 30%, adjusting microwave power to a metal temperature of 70 to 120 DEG C for microwave reaction for 3 to 60 min, and after a cooling temperature is 30 to 55 DEG C, obtaining solid sodium fluosilicate after solid-liquid separation and drying treatment . According to the process of the invention, waste fluorine-containing silicon slag is combined with the microwave technology, and sodium fluosilicate is generated in one step. Production costs are low and the process is simple, and harm of acidic silicon slag on the environment is eliminated. The invention is low-carbon environmental, and actually achieve an effect of fluorine-containing silicon slag environment friendly and high effective utilization and development.