摘要:
A process is disclosed for the separation of hydrogen cyanide from gases and waste gases by a throughflow or circulation scrubbing, in which formaldehyde is added at a controlled rate to the aqueous scrubbing liquid to form glycol nitrile. This addition is controlled by measuring the HCN tension in a measuring stream which has been branched off and which is first treated with hydrogen peroxide so that free H.sub.2 O.sub.2 is still detectable after 1 to 100 seconds and the pH is adjusted to a constant value before measurement of the HCN tension is carried out. The process prevents overdosing with formaldehyde which could not always be prevented in previously known processes in which the addition of formaldehyde was regulated by measuring the cyanide specific redox potential.
摘要翻译:公开了一种通过通流或循环洗涤从气体和废气中分离氰化氢的方法,其中将甲醛以受控的速率加入到水洗涤液中以形成二醇腈。 该添加通过测量已经分支并且首先用过氧化氢处理的测量流中的HCN张力来控制,使得在1至100秒之后仍然可以检测到游离H 2 O 2,并且在测量之前将pH调节至恒定值 HCN张力进行。 该方法防止了甲醛过量,这在以前已知的通过测量氰化物特定的氧化还原电位来调节甲醛的方法中是不可避免的。
摘要:
There is prepared an aqueous stable suspension of a water insoluble silicate capable of binding calcium ions and it is used for the production of washing and cleaning agents. The suspension contains in addition to water components A and B wherein component A is a silicate capable of binding calcium and having the formula(Cat.sub.2/n O).sub.x -Me.sub.2 O.sub.3 .multidot.(SiO.sub.2).sub.y Iand component B is a dispersing agent comprising a mixture of at least two fatty alcohols polyglycol ether based on isotridecyl alcohol or another aliphatic C.sub.13 alcohol and ethylene oxide having the following properties:(a) Fatty alcohol polyglycol ether having 4.5 to 5.5 EO units______________________________________Turbidity point DIN 53917 56 to 60.degree. C.Solidification point +4 to -25.degree. C.Viscosity at 50.degree. C. 13 to 28 m PasDensity at 50.degree. C. 0.94 to 0.96 g/ml______________________________________(b) Fatty alcohol polyglycol ether having 6 to 8 EO units______________________________________Turbidity point DIN 53917 66 to 74.degree. C.Solidification point +12 to -16.degree. C.Viscosity at 50.degree. C. 18 to 28 m PasDensity at 50.degree. C. 0.96 to 0.98 g/ml______________________________________
摘要:
A granulated detergent builder is disclosed comprising:65 to 85 weight percent of a water insoluble silicate capable of binding calcium, in the form of a finely dispersed, bound-water-containing, synthetically produced, water insoluble crystalline compound having the general formula:(Cat.sub.2/n O).sub.x.Me.sub.2 O.sub.3.(SiO.sub.2).sub.y (I), in which Cat is a cation exchangeable with calcium with the valency n, x is a number from 0.7 to 1.5, Me is boron or aluminum, and y a number from 0.8 to 6,4 to 10 weight percent sodium nitrilotriacetate1.5 to 3 weight percent nonionic surfactant0 to 1 weight percent alkali0.5 to 1.5 weight percent carboxymethyl cellulose and/or methylcelluloseand the balance is water.The product can be produced by spray drying an aqueous suspension in which all ingredients are dispersed or dissolved.
摘要:
A process is disclosed for the detoxication of aqueous solutions which contain cyanohydrins, in particular glycol nitrile, and/or nitriles and in addition contain decomposition catalyst for peroxide compounds, in particular manganese compounds, by perhydrolysis of the cyano compounds at temperatures of from 5.degree. to 80.degree. C. and pH values of from 8 to 12 by means of one or more peroxide compounds which are alkali metal percarbonates and perborates of alkali metals and alkaline earth metals and alkaline earth metal peroxides. The peroxide compounds are added as such to the solution to be detoxified or formed in situ in the solution to be detoxified. Sodium percarbonate is preferably used.
摘要:
There are provided aqueous pumpable stable suspensions of a water insoluble silicate capable of binding calcium ions which contain based on the total weight of the aqueous suspension(A) as the silicate capable of binding calcium 0.5 to 80 weight percent of a finely divided, bound water containing, synthetically produced, water insoluble compound of the general formula(Cat.sub.2/n O).sub.x.Me.sub.2 O.sub.3.(SiO.sub.2).sub.y (I),in which Cat is a cation exchangeable with calcium and which has the valence n, x is a number from 0.7 to 1.5, Me is boron or aluminum and y is a number between 0.8 and 6 and(B) as a dispersingly active component 0.5 to 6 weight percent of a mixture of at least two different alkylphenolethoxylates of the formula ##STR1## where R is an alkyl group of 1 to 15 carbon atoms. The component A especially can be a zeolite A while component B can consist of two alkylphenolethoxylates of formula (II) in which m is 2 to 7 and m is 8 to 15. The suspension can be employed for the production of powdery washing agents and detergents.
摘要:
Reduction of the nitrite content of aqueous solutions by treatment with hydrogen peroxide in the acidic pH range can be controlled by measurement of the redox potential. Contrary to the teaching of the prior art, addition of the hydrogen peroxide in the process according to the invention is terminated not at the highest redox potential, but only after lowering of the potential to a value of 650.+-.10 mV. In this way, nitrite contents below 1 mg/l can be obtained even when the solutions additionally contain fluctuating amounts of various compounds oxidizable by H.sub.2 O.sub.2.
摘要翻译:通过在酸性pH范围内用过氧化氢处理来降低水溶液的亚硝酸盐含量可以通过测量氧化还原电位来控制。 与现有技术的教导相反,根据本发明的方法中的过氧化氢的添加终止于没有达到最高的氧化还原电位,但是仅在将电位降低到650±10mV的值之后。 这样就可以获得低于1mg / l的亚硝酸盐含量,即使这些溶液另外含有波动量的可被H 2 O 2氧化的各种化合物。
摘要:
A process is disclosed for the detoxification of aqueous solutions containing cyanides and/or cyano complexes in the presence of heavy metals which are Mn, Co, Ni, Cu, Cd and Zn, more particularly Cu, by oxidative treatment of the solutions with peroxide compounds at pH values of 8 to 12. Peroxide compounds from the group consisting of alkali metal percarbonates and alkaline earth metal peroxides are used. The peroxide compounds are added to the solutions to be detoxified per se or are formed in situ therein from hydrogen peroxide and other components. Sodium perborate, sodium percarbonate and calcium peroxide are preferred.
摘要:
The detergent builder consists of a water-insoluble silicate capable of binding calcium ions as well as of a mixture of two acrylic acid polymerizates which exhibit different viscosity numbers.
摘要:
Granulated detergent builders, are disclosed consisting essentially of:70 to 80 weight percent of water-insoluble silicate, capable of binding calcium, in the form of a finely divided, bound-water-containing, synthetically produced, water-insoluble, crystalline compound of the general formula(Kat).sub.2/n O).sub.x.Me.sub.2 O.sub.3.(SiO.sub.2).sub.y (I),in which Kat represents an n-valent cation which is exchangeable with calcium, x a number from 0.7 to 1.5, Me boron or aluminum and y a number from 0.8 to 6,2 to 3 weight percent of nonionic surfactant,0 to 1 weight percent of alkali,2.4 to 5 weight percent of carboxymethylcellulose and/or methylcellulose,and the balance water.
摘要翻译:公开的颗粒状洗涤剂助洗剂基本上由以下组成:70至80重量%的能够结合钙的水不溶性硅酸盐,其为细分的含结合水的合成产生的水不溶性结晶化合物 通式(Kat)2 / nO)x.Me 2 O 3(SiO 2)y(I),其中Kat表示可与钙交换的n价阳离子,xa为0.7至1.5,Me硼或铝和ya 数量为0.8至6,2至3重量%的非离子表面活性剂,0至1重量%的碱,2.4至5重量%的羧甲基纤维素和/或甲基纤维素,以及余量的水。
摘要:
A laundry softener concentrate comprises one or more laundry softeners, synthetic silicon dioxide, and optionally one or more solubilizers. The laundry softener concentrate is in the form of a flowable powder.