Translation of "Aufschlusslösung" in English

The solid content in the pulp solution was 5 percent by mass.

The concentrated degradation solution then was subjected to nanofiltration.

Primarily, this is realized by way of thermal recovery from the degradation solution.

In a subsequent washing and sieving operation, the pulp obtained is separated from the digestion solution and purified.

The degradation solution is maintained in a stirred and tempered vessel at the desired temperature.

Total Kjeldahl and total nitrogen are commonly determined by titration after distillation of the digestion mixture to release the ammonia.

Instead of then siphoning off the suspension in order to apply the variant a, b or c, used in Method 2.1, the ammoniacal nitrogen in this solution may also be distilled directly, after adding sufficient sodium hydroxide to ensure a large surplus (4.12).

After appropriate dilution of the digestion solution with deionized water, the calcium content was determined by ICP-OES (inductively coupled plasma-optical emission spectrometry) at a wavelength of 317.933 nm against calibration solutions matched to the acid matrix.

Depending on the concentration of the elements in the digestion solution and the sensitivity of the measuring instrument used, the concentrations of the sample solutions were matched to the linear range of the calibration for the wavelengths used in each case (B. Welz “Atomic Absorption Spectrometry”, 2nd Ed., Verlag Chemie, Weinheim 1985).

After appropriate dilution of the digestion solution with deionized water, the calcium content is determined by ICP-OES (inductively coupled plasma-optical emission spectrometry) at a wavelength of 317.933 nm against calibration solutions matched to the acid matrix.

The high retention capacity of the membranes makes it possible, to recover a very pure alkaline-alcoholic degradation solution, which may be re-used for degradation without any additional thermal cleaning efforts.

In Table 1 there is described the mean retention of lignin in % at certain pressures and temperatures for the membranes M1, M2 and M3 in the preparation of a purified alkaline-alcoholic solution in the permeate, as well as a concentrated solution of substances extracted from the lignocellulose in the retentate, originating from a degradation solution of lignocellulose with an alkaline-alcoholic solution, by nanofiltration

The degradation solution was previously concentrated into untreated starting substrate by one recycling in order to increase the concentration of the substances extracted from the lignocellulose.

The organic constituents are oxidized, until the digestion solution, with fuming of the sulfuric acid, remains clear and pale.

An essential saving potential is the reduction of the quantity of the solution to be thermally treated, via separating off the alcoholic degradation solution as selective as possible.

A further product obtained is black liquor which, as well as the digestion solution, contains the other constituents of cellulosic materials such as wood.

Probably the most important digestion process is the alkaline sulfate or Kraft process, in which a digestion solution containing NaOH/NaS is used to obtain what is called the sulfate or Kraft pulp.

A three step chemical process for recovering phosphorus (ash dissolution by leaching, washing of digested solution, precipitation) was developed and studied. In parallel, a bioleaching process for recovering phosphorus was also developed and studied.

The true innovation in the ASAM process is the addition of methanol to the pulping solution.

The digested solution is separated from the insoluble solids in a drum filter.

The residue was washed on the suction filter and the wash water was combined with the processing solution.

The product solution with a volume of 2200 liters was found by titration to be 1.5 [n] N in HCl.

It was, however, found that this material liberated lead into the digestion solution, and so it was replaced by a teflon seal.

The process according to the present invention enables three commonly available raw materials to be processed in a very economical manner by a technically simple method in which considerable proportions of preconcentrated dilute acid are recycled without any loss of decomposition yield and without any accumulation in the reaction solution of traces of heavy metals, such as chromium or vanadium, from the slags.

The digest solution is then separated in a filter zone into an essentially lead-, cadmium- and zinc-free solid residue and a phosphoric acid containing dissolved lead, cadmium and zinc.

After digestion of the raw material with sulfuric acid, the digestion solution obtained is hydrolyzed at elevated temperature in the presence of water and suitable hydrolysis nuclei.