摘要:
In a continuous process for the preparation of phosphorous acid with simultaneous production of hydrochloric acid, a reaction zone is provided which is in open communication with a first scrubbing zone. A portion of the reaction product is recycled from the bottom of the reaction zone into the top of the scrubbing zone and phosphorous acid is removed from the circulation. Hydrogen chloride gas escaping from the top of the first scrubbing zone is brought into contact, in a cooled, second scrubbing zone, with an overstoichiometric amount of water. Hydrochloric acid is obtained which is passed as starting material into the reaction zone or into the top of the first scrubbing zone. The external cooling of the second scrubbing zone is controlled such that the temperature in the reaction zone is kept constant at a desired value between 90.degree. and 130.degree. C. without adding any external cooling or heating energy. Pure hydrochloric acid is recovered in an absorption zone.
摘要:
For the preparation of dicalcium phosphate dihydrate stabilized with dimagnesium phosphate trihydrate and sodium pyrophosphate, an aqueous suspension of calcium carbonate is introduced into a reactor and recirculated by pumping through a high-speed mixer at 3,500 to 8,000 rpm which is in flow connection with the lower and upper portion of the reactor. Into the mixer an amount of phosphoric acid is introduced which is at least sufficient for the quantitative formation of dicalcium phosphate dihydrate and then an oxygen-containing magnesium compound is introduced into the reactor. Finally, lime milk is metered into the reactor up to a maximum pH of 6.9, before the sodium pyrophosphate is added to the reactor. The resulting suspension which has a stabilized dicalcium phosphate dihydrate content of 20 to 33% by weight is spray-dried.An apparatus for carrying out the process comprises besides a stirred reactor 1 two stirrer-equipped slurry containers (6, 7) and an intermediate container 16 from which a line 17 leads into a spray tower 18 where it ends above an atomizer wheel 19. The spray tower 18 is also the end point for hot air lines 20 and is in flow connection with a filter 22. The bottom of filter 22 is the starting point for a product line 24 via which highly adsorbent dicalcium phosphate dihydrate can be withdrawn.
摘要:
The invention relates to a process for the preparation of crystalline sodium silicates having a sheet structure and high .delta. phase content from water glass, which has been prepared hydrothermally, by dehydration of the water glass and subsequent crystallization at elevated temperature, which comprises treating the water glass at temperatures of from 50 to 140.degree. C. prior to dehydration.
摘要:
The invention relates to a sparingly soluble alkali metal silicate which comprises alkali metal phyllosilicate in finely divided form in a non-phyllosilicatic alkali metal silicate environment of the formula x MI2O.y SiO2, in which MI is an alkali metal and y/x (1.9 to 500): 1; a process for its preparation and its use in detergents and cleaners.
摘要:
The invention relates to a process for the preparation of crystalline sodium silicates having a sheet structure and high .delta. phase content from water glass, which has been prepared predominantly hydrothermally, by dehydration of the water glass and subsequent crystallization at elevated temperature, wherein the water glass is a mixture of water glass prepared hydrothermally and tank furnace water glass, and also to its use.
摘要:
The invention relates to builder compositions with improved dissolution residue behavior, obtained by bringing a) crystalline layered sodium silicate of the formula NaMSixO2x+1*yH2O, where M is sodium or hydrogen, x is a number from 1.9 to 4 and y is a number from 0 to 20, and b) water or an aqueous solution or dispersion of at least one detergent ingredient, c) where the molar ratio of component a) to the water from component b) is 0.5:1 to 20:1, into contact with one another and subsequently heat-treating the resulting builder composition at 30 to 400° C. for 0.5 to 1000 min.
摘要翻译:本发明涉及具有改进的溶解残留行为的助洗剂组合物,其通过使a)结晶层状硅酸钠由式NaMSi x O 2 x + 1 * y H 2 其中M为钠或氢,x为1.9至4的数,y为0至20的数,b)水或至少一种洗涤剂成分的水溶液或分散体,c) 其中组分a)与组分b)的水的摩尔比为0.5:1至20:1,彼此接触,随后在30至400℃下热处理所得助洗剂组合物0.5至1000分钟 。
摘要:
The invention relates to cogranulates comprising phyllosilicates and disintegrants, in particular cellulose, and to detergents and cleaners which comprise these cogranulates, preferably in tablet form.
摘要:
The disclosure relates to a process for making calciummonohydrogen phosphate dihydrate with a high degree of whiteness from pure phosphoric acid and naturally occurring calcium carbonates. More particularly, a fine-particulate calcium carbonate is suspended in water and the suspension is mixed at temperatures between 0.degree. and 60.degree. C. with phosphoric acid so as to establish a Ca/P-ratio of 0.20 up to 0.57. The phosphoric acid is added in quantities per unit time preventing the resulting mixture from foaming over. Next, solid matter constituents are separated from the mixture, after CO.sub.2 has ceased to evolve, with the resultant formation of a clear colorless acid solution. This solution and an aqueous suspension or solution of pure alkali metal and/or alkaline earth metal carbonates and/or hydroxides, are jointly introduced into a reaction zone at a reaction temperature of 20.degree. to 45.degree. C. so as to establish a pH-value initially of 2.0 to 5.0 and then, towards the end of the reaction of 6.0 to 8.0. Finally, the reaction product is filtered off, washed out, and dried in known fashion.
摘要:
The invention relates to builder compositions obtainable by bringing a) crystalline sheetlike sodium silicate of the formula NaMSixO2x+1.yH2O, where M is sodium or hydrogen, x is a number from 1.9 to 4 and y is a number from 0 to 20. b) water and c) an acidic, H+-releasing component, where the d) molar ratio of the crystalline sheetlike sodium silicate a) to the total amount of the releasable H+ of the acid component c) is 4:1 to 1000:1 and the e) molar ratio of the water b) to the total amount of the releasable H+ of the acidic component c) is 3:1 to 1000:1. into contact with one another. The invention also relates to laundry detergents, cleaners, compounds and water softeners comprising the builder compositions according to the invention.
摘要:
The invention relates to a granular alkali metal phyllosilicate compound which comprises a crystalline alkali metal phyllosilicate, a colorant and an additive. The invention also relates to a process for its preparation, and to detergents and cleaners which comprise such a granular alkali metal phyllosilicate compound.