52results about How to "Control acidity" patented technology

The invention relates to a production method of a dye intermediate, i.e., 6-nitro-1,2,4-sulfonic acid. The method is characterized in that: the 6-nitro-1,2,4-sulfonic acid is obtained by taking ethyl naphthol as a major raw material and performing procedures including nitrosification, neutralizing, sulfonation reduction displacement, diazotization, acidification, nitration and the like. Due to the adoption of the method, the problems of the production of a large amount of high-COD (Chemical Oxygen Demand) waste water and waste gas and high production cost existing in a production process can be solved. In the method, ethyl naphthol is dissolved by raising the temperature naturally, so that a liquid caustic soda dissolving method is replaced, the using amount of liquid caustic soda and sulfuric acid is reduced, production cost is reduced, and the production of waste water is reduced; a diazonium resisting method is adopted for diazonium, so that the production of toxic waste gas is reduced, the yield of diazonium is increased, and production cost is reduced; the diazonium resisting method is adopted, and solid sodium nitrite is added, so that the production of waste water can be reduced; and in diazonium, copper sulfate is taken as a catalyst, so that reaction speed is increased, the occurrence of side reactions is reduced, and yield is increased.

The invention relates to a process for producing lotus seed spirit. The process comprises the following steps of: selecting and crushing lotus seeds, moistening and stewing the crushed lotus seeds at the high temperature, adding water into the lotus seeds, spreading the lotus seeds to be cool, adding yeast into the lotus seeds, feeding the lotus seeds into a cylinder to perform large dreg fermentation, discharging fermented grains from the cylinder, distilling the lotus seeds to obtain first dreg spirit and rest secondary dreg yeast, and adding a stirring material into the secondary dreg yeast in a ratio of 1: 0.4-0.6, wherein the stirring material is prepared after the lotus seeds are selected, crushed, moistened at the high temperature and stewed; adding water into the lotus seeds again, spreading the lotus seeds to be cool, adding yeast into the lotus seeds, feeding the lotus seeds into the cylinder to perform secondary dreg fermentation, discharging the fermented grains from the cylinder, and distilling the lotus seeds to obtain secondary dreg spirit or rest third dreg yeast; adding water into the lotus seeds again, spreading the lotus seeds to be cool, adding yeast into the lotus seeds, feeding the lotus seeds into the cylinder to perform third dreg fermentation, discharging the fermented grains from the cylinder, and distilling the lotus seeds to obtain third dreg spirit; and blending the first dreg spirit and the second dreg spirit, or blending the first dreg spirit, the second dreg spirit and the third dreg spirit, and putting the blended spirit into storage and ageing the spirit. Therefore, the process can effectively control the acidity during fermentation, reasonably increase the activity of enzyme, reduce purification, effectively inhibit impurity bacteria, improve the content of ethyl acetate and ethyl caproate in the spirit, reduce the methanol in the spirit, enrich the mouthfeel, and keep the fragrance of the sprit thick.

The invention discloses a spraying and washing process of an ammonium sulfate crystallizer by a non-saturator method, comprising the steps of: spraying and washing the ammonium sulfate crystallizer by ammonia still stronger ammonia water obtained by an ammonia distillation process; washing the attachment on the inner surface of the ammonium sulfate crystallizer; and controlling the acidity of the circulating mother liquor in the ammonium sulfate crystallizer. The mass concentration of the ammonia still stronger ammonia water is 3-6% at 40-55 DEG C. The invention has the maximum advantage of combining the ammonium sulfate crystallizer by non-saturator method with technical characteristics of ammonia distillation, washing ammonium sulfate crystal and attachment on the inner surface of the washing crystallizer by temperature of ammonia and stronger ammonia water in ammonia evaporation stronger ammonia water generated by ammonia distillation and neutralizing a part of free acid in the ammonium sulfate liquor in condition that the production flow does not change. The invention is beneficial to optimize and improve the ammonium sulfate crystallization process and comprehensively utilizing ammonia resources as an important means of energy conservation and emission reduction.

The invention discloses a preparation method for a propane dehydrogenation catalyst. Without hydrogen reduction, a reaction feed gas is directly introduced and the Pt reduction degree is controlled to improve the stability and sulfur tolerance of the catalyst. The method omits of the drying roasting process, can effectively remove chlorine from the catalyst without hydrothermal treatment, and can significantly improve the activity, selectivity, stability and sulfur tolerance of the catalyst without hydrogen reduction. The preparation method is simple. The catalyst prepared by the method can avoid excessive alkali loss, improve the dispersity of Pt based catalyst active metals, form more secondary active phases, and ultimately improve the selectivity of the target product propylene and the catalyst activity, stability and sulfur tolerance.