SU552094A2 - Extractive extraction method of valuable components from wood and pneumatic osmol - Google Patents

Description

one

The invention relates to methods for extracting solids with a solvent when applying pulsations and can be used in the pulp and paper industry in the processing of larch wood and for the production of extraction rosin.

There is a method of extractive extraction of valuable components from wood and pip osmol by treating the solid particles of the starting materials with a solvent when heated using pulsation. However, this method has a periodicity and a longer process time; During the process, the wood is loaded periodically and the solvent duct through the fixed layer of wood does not provide the necessary process intensification even in the presence of pulsations. In addition, the extraction process is carried out under conditions that do not allow the mass transfer process inside the wood capillaries to be affected.

The closest technical resolution to the invention is a method of extractive extraction of valuable components from wood and pneumatic osmol by treating the solid particles of the starting materials with a solvent when heated using pulsation, according to which the pulsation scale is chosen equal to the particle size of the starting materials.

The disadvantages of this method are the use of relatively high temperatures (above 80 ° C) and the need to pre-dry the chips in order to remove moisture. The use of intensive methods of drying chips, additives of hydrophilic solvents (butanol), peionogenic surfactants, an increase in the process temperature allows in some

As far as accelerating the process of diffusion of resinous substances inside the chips, however, there is practically no effect on the overall extraction rate. As a consequence, the duration of existing extraction methods is 6-8 hours,

which requires, in practical terms, the use of devices of large dimensions.

The degree of rosin recovery, despite the long process time, is no more than 82-85%.

The aim of the invention is to increase

Steppe extract valuable components from

pneumatic osmol and the use of waste

masses.

This is achieved by the fact that the pulsation frequency

choose in the range of 0.2-1.0 kHz at gradient speeds of 10 -10 -1 / s, and the temperature is maintained at 55-65 ° C.

When created in suspension, the particles are formed as wood chips, sawdust or

chips, small-scale pulsations at

velocity gradients / l Q -10--1 / s (where and is linear velocity; / is characteristic linear dimension) the extraction process speed increases significantly, and the speed of this process is also related to the scale of csalsation - the optimal condition is when the pulsation scale comparable to the size of the wood particles. The optimal range of velocity gradients is a range of 10 -10 -1 / s. With velocity gradients exceeding 10 -1 / s, the content of fines increases and the speed of the extraction process decreases; At gradients of speed less than 10 sec, the degree of extraction decreases.

In the case of extraction of pneumatic osmol, when treating a suspension formed by osmol chips and a solvent, in the field of small-scale pulsations under these conditions, the speed of the extraction process sharply increases (the duration of extraction does not exceed 5 minutes). Along with the extraction process under these conditions, a change in the structure of the osmol chips occurs. From the resulting pulp, the organic solvent is obtained by known methods by steam distillation in apparatus with or without external heating.

The extraction of rosin from the extract is carried out by known methods.

The iMacca wood obtained according to the proposed method, as shown by the obtained results, is suitable for producing fibreboard, cardboard and other materials without any additional processing. In the process of researching the method, supd has been established, which is associated with new unobvious effects.

The existence of an optimal frequency range of 0.2–1.0 kHz and a range of variations in the velocity gradient of 10–101 / sec. With an increase in these parameters, a noticeable appearance of wood fractions of small sizes is observed, with a decrease in these parameters, the speed of the process of extraction of resinous substances decreases.

As the temperature of the medium increases to the boiling point of the solvent and higher, the extraction rate decreases, which is apparently due to the decrease in the efficiency of the pulsating phenomena, and with decreasing temperature below 40 ° C, a decrease in the extraction rate is also observed.

Example. The proposed method was tested in integrated laboratory conditions.

Osmolzu wood chips fraction 5-15 mm, containing 22.5% rosin (to dry deresined wood), is subjected to gasoline extraction in the field of small-scale pulsations at a frequency of 0.7 kHz and a velocity gradient of U -1 / sec. The results of the experiments are presented in the table.

For comparison, the table shows data on the degree of extraction of resinous during countercurrent extraction with gasoline.

Claims (1)

The described method has the following advantages: high speed of the process; an increase in the degree of extraction and, consequently, the release of resinous substances; the possibility of using small size apparatus due to the high speed of the process; a significant improvement in working conditions in half-burst and explosive terms due to the use of whole-filled pressurized extraction equipment and a significant reduction in its dimensions; the possibility of using extraction mass for fibreboard and other materials. 3 The claims of the method of extractive extraction of valuable components from wood and pneumatic osmol according to ed. St. No. 538724, differing by the fact that 5, in order to increase the degree of extraction of 4 valuable components from pneumatic osmol and use the treated mass, the pulsation frequency is chosen in the range of 0.2-1.0 kHz at speed gradients of 10 -10 -1 / s, and the temperature is kept at 55-65 ° C.