Übersetzung für "Alkalisieren" in Englisch

After being rendered alkaline with 2N sodium hydroxide solution, the residue is extracted with methylene chloride.

The acid aqueous phase was rendered alkaline with 2 N NaOH and then extracted with ethyl acetate.

Alkaline water is the fastest and the best way of alkalizing our body.

This reaction is reversible and Roussin’s Red Salt is reformed upon alkalization of the reaction solution.

On alkalization with NaOH, the product precipitates, it is suction-filtered and recrystallized from ethyl acetate.

After 30 minutes' alkalisation at 28° C., 6.4 kg of an 80% monochloroacetic acid are injected.

The addition of the modifier during the alkalizing enhances the reactivity of the cellulose for the xanthation.

The sodium hydroxide for alkalizing contained 80 grams of sodium hydroxide per liter (2.0 molar).

The crude product was converted into the base by rendering alkaline with sodium hydroxide solution and subsequent extraction with ethyl acetate.

The two-step alkalization reaction in suspension that takes place with the presteeped cellulose is essential for the process according to the invention.

The aqueous phase is subsequently buffered to pH 6 with 2 N NaOH and extracted with ether (50-ml portions) in fractions with rising pH values (fractioned alkalisation with 2 N NaOH).

It is, however, also possible to alkalize in the absence of an organic solvent which is then added in the etherifying stage only, or to add the entire quantity of alkali metal hydroxide in the etherifying stage which is then, simultaneously, the alkalizing stage, i.e., separate alkalizing is not necessary in that case.

The residue was dissolved in 1 N hydrochloric acid, and the solution obtained was fractionally extracted with ether at increasing pH values (rendered alkaline with 2 N NaOH).

After alkalisation for 30 minutes at 30° to 35° C., the temperature is increased to 55° C. and kept at that level for 1 hour.

The residue was dissolved in 1N HCl, and the resulting solution was fractionally extracted with ether at increasing pH values (rendered alkaline with 2N NaOH).

In this case, after acidic deproteinisation of the sample, for example with trichloroacetic acid or picric acid, after the addition of picric acid and rendering alkaline, a red colour develops in the supernatant, which is measured photometrically.

This is done either through (A) neutralization or light alkalization of the preparation with aqueous solutions of alkali or alkaline earth hydroxides or carbonates, during which the crude ester (I) is separated and excess diol is transferred to the aqueous phase, or (B) stirring the reaction preparation, preferably at a temperature of 20-60 degrees Celsius with solid alkali or alkaline earth hydroxide or carbonate and direct extraction of the crude ester (I) with carbonic hydrogen substances, such as Toluol.

The cyanohydrin content in aqueous solutions may be determined by means of cyanide determination processes in which the cyanohydrin is decomposed into the carbonyl compounds and HCN and the latter is removed from the equilibrium for determination of the cyanide, for example by alkalization to a pH>12 and argentometric titration with potentiometric indication of the end point.

Cellulose ethers as a rule are prepared by rendering cellulose alkaline and subsequently reacting it with etherifying agents, such as methyl chloride, ethylene oxide, propylene oxide or chloroacetic acid, in the presence of suitable solvents or suspending agents.

In this case, after evaporating off the solvent, the reaction product must first be dissolved by treatment with dilute acid and then precipitated by rendering the solution alkaline.

The base of the formula II is then precipitated by rendering the solution alkaline with any water-soluble base which is sufficiently alkaline to ensure that a pH value of at least 8 is achieved.

If more by-products are present, a second purification can be carried out without difficulty or losses, by dissolving the nitrile of the formula II once more in dilute acid, if necessary treating the solution once more with active charcoal, and precipitating the nitrile again by rendering the solution alkaline.

Resulting salts are converted (for example, by being rendered alkaline with aqueous sodium hydroxide or potassium hydroxide) into the free base, which is then isolated by suitable measures, for example solvent extraction with a solvent, such as chloroform, diethyl ether or toluene, which is not miscible with water.

In the case of alkalization with aqueous solutions of alkali metal hydroxides, a pH value of 9 to 10, and in the case of carbonates a pH value of 8 to 9 has proved to be especially advantageous for the production of stable dispersions.

After rendering the hydrochloric acid solution alkaline with 25% ammonia solution to pH 8, the solution is shaken out three times with 250 ml. amounts of ethyl acetate.